WO2019218283A1 - Battery and electronic device - Google Patents

Abstract

Disclosed in the present application are a battery and an electronic device. The battery comprises: a housing, provided with a through hole; a roll core, provided in the housing, the roll core at least comprising a first pole piece, a second pole piece, and a cavity, the first pole piece being electrically connected to the housing, and the housing being a first electrode of the battery; and a core shaft, a first end part of the core shaft being exposed by means of the through hole, and the first end part being fixed in the through hole by means of a first insulating layer. A second end part of the core shaft is provided in the cavity, the second pole piece is electrically connected to the core shaft, and the core shaft is a second electrode of the battery. According to the present application, the space is saved, and the energy density of a battery is improved.

Description

Battery and electronic device

[Technical Field]

The present application relates to the technical field of batteries, and relates to a battery and an electronic device.

 【Background technique】

The prior art button cell is generally a chamber structure in which a metal bottom case and a metal top case are combined, the bottom case is usually connected to the positive electrode, and the top case is usually connected to the negative electrode. The top case and the bottom case are fixed together by a snap structure, and an insulating layer is disposed between the top case and the bottom case, and the insulating layer is usually a plastic apron. The size of the insulating layer is the same as the size of the bottom case or the size of the top case. The insulating layer and the snap structure occupy a large space of the button battery, so that the battery is bulky, resulting in a low energy density of the prior art button battery.

 [Summary of the Invention]

In order to solve the above problems of the prior art button battery, the present application provides a battery and an electronic device.

To solve the above problem, an embodiment of the present application provides a battery, including:

a through hole is provided in the outer casing;

a winding core disposed in the outer casing, the winding core at least comprising a first pole piece, a second pole piece and a cavity, the first pole piece being electrically connected to the outer casing, the outer casing being the battery First electrode

a mandrel, the first end of the mandrel is exposed through the through hole, and the first end is fixedly disposed in the through hole through a first insulating layer; the second end of the mandrel is disposed Within the cavity, the second pole piece is electrically coupled to the mandrel, the mandrel being a second electrode of the battery.

In order to solve the above technical problem, the present invention also provides an electronic device including the above battery for supplying power to the electronic device.

Compared with the prior art, the winding core of the present application is disposed in the outer casing, the first pole piece of the winding core is coupled to the outer casing, and the outer casing is the first electrode of the battery; the first end of the mandrel is exposed through the through hole of the outer casing, And the first end portion is fixedly disposed in the through hole through the first insulating layer, the second end portion of the mandrel is disposed in the cavity of the winding core, the second pole piece is coupled to the core shaft, and the core shaft is the second electrode of the battery Since the first insulating layer is disposed in the through hole, the first insulating layer occupies less battery, saves space, and improves energy density of the battery; further, the outer casing is the first electrode of the battery, and the mandrel is the second electrode of the battery There is no need to set additional leads to improve the battery experience.

 [Description of the Drawings]

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings to be used in the embodiments will be briefly described below. Obviously, the drawings in the following description are only some of the present application. For the embodiments, those skilled in the art can obtain other drawings according to the drawings without any creative work.

1 is a perspective view of a battery according to a first embodiment of the present application;

Figure 2 is a schematic cross-sectional view of the battery of Figure 1;

Figure 3 is a schematic structural view of the winding core of Figure 1;

Figure 4 is a schematic structural view of another embodiment of the winding core of Figure 1;

5 is a schematic structural view of a battery according to a second embodiment of the present application;

6 is a schematic structural view of a battery according to a third embodiment of the present application;

Figure 7 is a schematic view showing the structure of the first tab of Figure 6 disposed on the first pole piece;

Figure 8 is a schematic structural view of the winding machine of the winding core of Figure 6;

Figure 9 is a top plan view showing the winding core of the winding machine of Figure 8;

Figure 10 is a schematic view showing the structure of the liquid injection hole of the battery of Figure 6;

11 is a schematic structural view of a battery according to a fourth embodiment of the present application;

Figure 12 is a schematic structural view of a casing of another embodiment of Figure 11;

Figure 13 is a schematic structural view of a battery according to a fifth embodiment of the present application;

Figure 14 is a schematic structural view of a battery of a sixth embodiment of the present application;

15 is a schematic structural view of a battery according to a seventh embodiment of the present application;

Figure 16 is a schematic structural view of a battery of an eighth embodiment of the present application;

17 is a schematic structural view of a winding core in a battery according to a ninth embodiment of the present application;

18 is a schematic structural view of a battery according to a tenth embodiment of the present application;

Figure 19 is a schematic structural view of a battery of an eleventh embodiment of the present application;

Figure 20 is a schematic structural view of a contact area of the first pole piece of Figure 19;

21 is a schematic structural view of a battery of a twelfth embodiment of the present application;

Figure 22 is a schematic structural view of a battery of a thirteenth embodiment of the present application;

23 is a schematic structural view of a battery of a fourteenth embodiment of the present application;

Figure 24 is a schematic structural view of a battery of a fifteenth embodiment of the present application;

Figure 25 is a schematic structural view of a winding core in a battery of a sixteenth embodiment of the present application;

Figure 26 is a schematic structural view of an expansion region of the second pole piece of Figure 25;

Figure 27 is a schematic structural view of a mandrel in a battery of a seventeenth embodiment of the present application;

28 is a schematic block diagram of an electronic device of the first embodiment of the present application.

【Detailed ways】

The present application will be further described in detail below with reference to the accompanying drawings and embodiments. It is specifically noted that the following examples are merely illustrative of the present application, but are not intended to limit the scope of the application. In the same manner, the following embodiments are only partial embodiments of the present application, and not all of the embodiments, and all other embodiments obtained by those skilled in the art without creative efforts are within the scope of the present application.

The orientation or positional relationship of the terms "inside", "outside" and the like in the specification and claims of the present application and the above-mentioned drawings are based on the orientation or positional relationship shown in the drawings, or the usual pendulum when the product is used. The orientation or positional relationship of the present invention is only for the convenience of the description of the present application, and is not intended to indicate or imply that the device or component referred to has a specific orientation, is constructed and operated in a specific orientation, and therefore is not to be construed as being limit.

Furthermore, the terms "first", "second", "third", "fourth", etc. (if present) in the specification and claims of the present application and the above figures are used to distinguish similar objects without Used to describe a specific order or order. It is to be understood that the data so used may be interchanged where appropriate, such that the embodiments of the present application described herein can be implemented, for example, in a sequence other than those illustrated or described herein. In addition, the terms "comprises" and "comprises" and "the" and "the" are intended to cover a non-exclusive inclusion, for example, a process, method, system, product, or device that comprises a series of steps or units is not necessarily limited to Those steps or units may include other steps or units not explicitly listed or inherent to such processes, methods, products or devices.

1 is a perspective view of a battery according to a first embodiment of the present application; and FIG. 2 is a schematic cross-sectional view of the battery of FIG. 1. The battery 10 can be a small battery such as a button type lithium ion secondary battery or a small cylindrical battery, and the battery 10 can be applied to an electronic device such as a Bluetooth earphone, a hearing aid, or a car key.

The battery 10 includes a housing 11, a winding core 12, a core shaft 13, and a first insulating layer 14. The outer casing 11 may be provided with a through hole 111. The outer casing 11 may include an upper cover 112 and a casing 113. The upper cover 112 is fixed to the casing 113 by welding; the through hole 111 may be disposed at a central position of the upper cover 112. The material of the outer casing 11 may be a metal material such as stainless steel or aluminum, and the outer casing 11 of the present application may be stainless steel.

The winding core 12 is disposed in the outer casing 11, that is, the upper cover 112 and the outer casing 113 of the outer casing 11 form a receiving space, and the winding core 12 is disposed in the receiving space of the outer casing 11. The core 12 includes a first pole piece 121, a second pole piece 123, and at least one diaphragm layer, and the diaphragm layer may be disposed between the first pole piece 121 and the second pole piece 123.

Specifically, the core 12 may include a first pole piece 121, a first diaphragm layer 122, a second pole piece 123, a second diaphragm layer 124, and a cavity 125, wherein the first pole piece 121, the first diaphragm layer 122, and the first The second pole piece 123 and the second diaphragm layer 124 are sequentially stacked, as shown in FIG. The stacked first pole piece 121, the first diaphragm layer 122, the second pole piece 123, and the second diaphragm layer 124 are wound on a winder to form a winding core 12; the wound first pole piece 121, The first diaphragm layer 122, the second pole piece 123, and the second diaphragm layer 124 form a cavity 125 that is located at a center position of the winding core 12.

In other embodiments, the core 12 may include a plurality of first pole pieces 121, a first diaphragm layer 122, a second pole piece 123, and a second diaphragm layer 124 that are sequentially stacked. For example, the core 12 may include two first pole pieces 121, a first diaphragm layer 122, a second pole piece 123, and a second diaphragm layer 124, which are sequentially stacked, as shown in FIG.

The first end portion 131 of the mandrel 13 is exposed through the through hole 111, that is, the first end portion 131 passes through the through hole 111 such that the first end portion 131 is located outside the outer casing 11. The first end portion 131 is fixedly disposed in the through hole 111 through the first insulating layer 14 , that is, the first insulating layer 14 is disposed in the through hole 111 between the first end portion 131 and the upper cover 112 , and the first insulating layer 14 is for fixing the first end portion 131 in the through hole 111 of the upper cover 112. The first insulating layer 14 may be glass, and the first insulating layer 14 serves to seal the battery 10 and insulate the mandrel 13 from the outer casing 11.

The second end 132 of the mandrel 13 is disposed in the cavity 125 of the core 12, and the second pole piece 123 of the core 12 is electrically connected to the mandrel 13, that is, the second pole piece 123 and the second end of the core 12. Portion 132 is electrically connected such that mandrel 13 is the second electrode of battery 10. The first pole piece 121 of the core 12 is electrically connected to the outer casing 11, that is, the first pole piece 121 is electrically connected to the casing 113 such that the outer casing 11 is the first electrode of the battery 10. In other embodiments, the upper cover 112 of the outer casing 11 and the housing 113 may be connected by an insulating material. In this case, the first pole piece 121 of the core 12 may be electrically connected to the upper cover 112 to The upper cover 112 is the first electrode of the battery 10, or the first pole piece 121 is electrically connected to the housing 113 such that the housing 113 is the first electrode of the battery 10.

The first pole piece 121 may be a negative electrode piece, the second pole piece 123 may be a positive electrode piece, the outer casing 11 may be a negative electrode of the battery, and the mandrel 13 may be a positive electrode of the battery 10. In other embodiments, the first pole piece 121 can be a positive electrode piece, the second pole piece 123 can be a negative electrode piece, the outer casing 11 can be a positive electrode of the battery, and the mandrel 13 can be a negative electrode of the battery 10.

Wherein, the diameter of the first end portion 131 may be smaller than the diameter of the second end portion 132. The battery 10 may have a diameter of 3 to 50 mm, the battery 10 may have a height of 3 to 100 mm, for example, the battery has a diameter of 10 mm, and the battery 10 has a height of 3 mm.

The first insulating layer 14 of the present application is disposed in the through hole 111. The first insulating layer 14 occupies less volume of the battery 10, can save space, and improves the energy density of the battery 10. In addition, the upper cover 112 is fixed to the housing by soldering. 113, the original snap-fit structure is omitted to occupy the volume of the battery 10, further saving space; in addition, the outer casing 11 is the first electrode of the battery 10, the mandrel 13 is the second electrode of the battery 10, and the external connection of the battery 10 The structure can be configured to be engaged with the shape of the battery 10, and directly abuts the first electrode and the second electrode of the battery 10 with the external connection structure, thereby eliminating the need for additional lead wires and improving the experience of the battery 10.

The present application provides the battery of the second embodiment. As shown in FIG. 5, the battery 10 further includes a second insulating layer 15 and an insulating spacer 16.

Wherein, the second insulating layer 15 is covered on the winding core 12, that is, the second insulating layer 15 is disposed on the surface of the winding core 12, and the second insulating layer 15 is used to prevent the winding core 12 from contacting the mandrel 13 or the outer casing 11 Battery 10 is shorted. The material of the second insulating layer 15 may be PP (Polypropylene) or PET (Polyethylene). Terephthalate, polyethylene terephthalate), PE (Polyethylene, polyethylene), PVC (Polyvinyl One or more of chloride, polyvinyl chloride or PI (Polyimide Film).

The insulating spacer 16 is disposed under the mandrel 13 and the second pole piece 123 electrically connected to the mandrel 13, that is, the insulating spacer 16 is disposed between the outer casing 11 and the second end 132 for preventing the mandrel 13 and The second pole piece 123 is in contact with the outer casing 11 to cause the battery 10 to be short-circuited. The material of the insulating spacer 16 may be one or more of PP, PET, PE, PVC, PI, inorganic material, alumina, magnesia, aluminum hydroxide, silicon dioxide or carbon fiber.

The second insulating layer 15 of the present application is covered on the winding core 12, which can prevent the winding core 12 from contacting the mandrel 13 or the outer casing 11 and causing the battery 10 to be short-circuited; the insulating spacer 16 is disposed on the mandrel 13 and electrically connected to the mandrel 13 Below the second pole piece 123, the mandrel 13 and the second pole piece 123 are prevented from coming into contact with the outer casing 11 to cause the battery 10 to be short-circuited, thereby improving the safety performance of the battery 10.

The present application provides the battery of the third embodiment. As shown in FIG. 6, the core 12 further includes a first tab 126 connected to the first pole piece 121 and a second tab 127 connected to the second pole piece 123. One of the tabs 126 is disposed on the first pole piece 121, and the second tab 127 is disposed on the second pole piece 123.

At least one first tab 126 is disposed on the first pole piece 121. The at least one first tab 126 may be a single first tab 126. For example, the at least one first tab 126 may be a first tab. 126 or 3 first tabs 126; at least one first tab 126 may be a plurality of first tabs 126, for example, at least one first tab 126 may be 2 first tabs 126 or 4 first Tab 126. At least one first tab 126 may be disposed at one end (eg, a head) of the first pole piece 121; or at least one first tab 126 may be disposed at an intermediate position of the first pole piece 121; or at least one first tab 126 may be disposed at the other end (eg, the tail) of the first pole piece 121. In addition, at least one first tab 126 may be disposed on a first surface (eg, front surface) of the first pole piece 121; or at least one first tab 126 may be disposed on a second surface of the first pole piece 121 (eg, behind) )on. Therefore, the number and position of the first tabs 126 can be variously arranged, for example, the number of the first tabs 126 is 1, located in the middle of the first pole piece 121, as shown in FIG. 7; or the first tab The number 126 is 3 and is located at one end of the first pole piece 121. Similarly, at least one second tab 127 is disposed on the second pole piece 123. The number and position of the second tabs 127 can be arranged in various combinations, and details are not described herein again.

The first pole piece 121 is connected to the outer casing 11 through the first tab 126, that is, the first tab 126 is welded to the outer casing 11. The second pole piece 123 is connected to the mandrel 13 by the second tab 127, that is, the second pole piece 123 is welded to the second end 132 of the mandrel 13 by the second tab 127.

As shown in Figure 8, the winder can include a first spool 18 and a second spool 19 for winding the core material 128 to form a core 12; 128 may be a first pole piece 121, a first diaphragm layer 122, a second pole piece 123, and a second diaphragm layer 124 that are sequentially stacked. First, one end of the core material 128 is fixed between the first reel 18 and the second reel 19, that is, the nip portion 129 of the core material 128 is disposed between the first reel 18 and the second reel 19; The reel 18 and the second reel 19 are simultaneously rotated to wind the core material 128; after the winding of the core material 128 is completed by the first reel 18 and the second reel 19, the first reel 18 and the second reel 19 are drawn As shown in FIG. 9, the clamping portion 129 is located within the cavity 125. Therefore, the clamping portion 129 needs to be pushed to the inner wall of the winding core 12 to enable the cavity 125 to receive the second end portion 132 of the mandrel 13.

As shown in FIG. 10, the battery 10 further includes an electrolyte and a liquid injection hole 17 which is provided on the outer casing 11. Wherein, the liquid injection hole 17 is disposed at the bottom of the outer casing 11; the electrolyte is injected into the accommodating space such that the first pole piece 121 and the second pole piece 123 are immersed in the electrolyte, and the electrolyte is used to make the first pole piece 121 and the second pole piece 123 perform charge transfer through the electrolyte. The electrolyte is generally prepared from a high-purity organic solvent, an electrolyte lithium salt (lithium hexafluorophosphate), an additive, and the like under certain conditions and at a certain ratio.

The present application connects the outer casing 11 through the first pole piece 126 through the first pole piece 126, and does not need to additionally provide a connecting line, thereby saving cost.

The present application provides the battery of the fourth embodiment, which is different from the battery disclosed in the first embodiment in that, as shown in FIG. 11, the housing 21 may include a lower cover 212 and a housing 213, and the housing 213 may be The housing 213 is provided with a through hole 211, and the lower cover 212 is fixed to the housing 213 by welding, that is, the lower cover 212 is fixed to the opening of the housing 213 by welding.

In other embodiments, the outer casing 31 may include an upper cover 312, a casing 313 and a lower cover 314. As shown in FIG. 12, the upper cover 312 is provided with a through hole 311, and the upper cover 312 and the lower cover 314 are respectively They are fixed to both sides of the casing 313 by welding.

The present application provides a battery of a fifth embodiment. As shown in FIG. 13, the battery 40 includes a housing 41, a winding core 42, a spindle 43 and a first insulating layer 44. The outer casing 41 can be the outer casing disclosed in the above embodiments. The core 42 can be the core disclosed in the above embodiment. The first insulating layer 44 can be the first insulating layer disclosed in the above embodiment. Narration.

The first end portion 431 of the mandrel 43 is exposed through the through hole 411, and the first end portion 431 may be the first end portion disclosed in the above embodiment, and details are not described herein again.

The second end portion 432 of the mandrel 43 is provided with at least a slit 433 that matches the grip portion 429 of the core material, that is, the grip portion 429 can be disposed within the slit 433. The clamping portion 429 is the same as the clamping portion 129 disclosed in the third embodiment above, and details are not described herein again.

Since the clamping portion 429 can be disposed in the slit 433, after the winding of the core material is completed by the first reel and the second reel, it is not necessary to push the clamping portion 429 to the inner wall of the winding core 42, the second of the mandrel 43 The end portion 432 is disposed directly within the cavity 425 of the core 42 when the clamping portion 429 is disposed within the slit 433.

Wherein, the second end portion 432 of the mandrel 43 may further be provided with a third insulating layer 434 for covering the second end portion 432 located in the crack 433 to prevent the second end portion of the mandrel 43 The 432 and the clamping portion 429 create a short circuit to improve the safety performance of the battery 40. The material of the third insulating layer 434 may be one or more of PP, PET, PE, PVC, or PI.

In the present application, at least a slit 433 is disposed at the second end portion 432 of the mandrel 43. The clamping portion 429 is disposed in the slit 433, and the clamping portion 429 is not required to be pushed to the inner wall of the winding core 42, thereby reducing the manufacturing process of the battery 40. The production efficiency of the battery 40 is improved. In addition, the second end portion 432 of the mandrel 43 can also be provided with a third insulating layer 434, which can prevent the second end portion 432 of the mandrel 43 and the clamping portion 429 from short-circuiting, and improve the battery 40. Security performance.

The present application provides the battery of the sixth embodiment. As shown in FIG. 14, the battery 50 includes a housing 51, a winding core 52, a core shaft 53, and a first insulating layer 54. The outer casing 51 can be the outer casing disclosed in the above embodiment, and the core 52 can be the core disclosed in the above embodiment. The first insulating layer 54 can be the first insulating layer disclosed in the above embodiment. Narration.

Wherein, the mandrel 53 includes a first sub-core 531 and a second sub-core 532, and the diameter of the first sub-core 531 is smaller than the diameter of the second sub-core 532. The diameter of the first sub-core 531 may be 0.5-1.5 mm, the diameter of the second sub-core 532 may be 1.7-2.5 mm, for example, the diameter of the first sub-core 531 is 1.5 mm, and the diameter of the second sub-core 532 The diameter is 2.5mm.

The first sub-core 531 is exposed through the through hole 511 and is fixedly disposed in the through hole 511 through the first insulating layer 54 to fix the first sub-core 531 to the upper cover 512. The material of the first sub-core 531 may be one or two kinds of stainless steel or Kovar alloy; the Kovar alloy is an iron-nickel-cobalt alloy, wherein the Kovar alloy may be a hard glass iron containing 29% nickel and 17% cobalt. The base seal joins the gold. The Kovar alloy has a linear expansion coefficient similar to that of the glass in the range of 20-450 ° C. Therefore, the first sub-core 531 corresponding to the region 534 of the first insulating layer 54 can be made of Kovar, and the first insulating layer 54 and the first layer are improved. The tightness between a sub-core 531.

The second sub-core 532 is provided with a groove 533 for accommodating the first sub-core 531. The second sub-core 532 can be used as a reel, one end of the core material is fixed on the second sub-core 532, and the second sub-core 532 is used to wind the core material to the second sub-core 532. The surface forms the core 52, eliminating the need for an additional reel, eliminating the need to withdraw the reel from the core 52, saving manufacturing processes and increasing production efficiency.

The material of the second sub-core 532 may be aluminum, copper or stainless steel. When the material of the second sub-core 532 is aluminum or copper, the diameter of the first sub-core 531 may be larger than the diameter of the groove 533, and the first sub-core 531 is disposed in the groove 533 to make the first sub- The mandrel 531 is fixed within the recess 533 of the second sub-mandrel 532. When the material of the second sub-core 532 is stainless steel, the diameter of the first sub-core 531 is less than or equal to the diameter of the groove 533, and the first sub-core 531 is fixed in the groove 533 by welding.

The mandrel 53 of the present application includes a first sub-core 531 and a second sub-core 532. The region 534 of the first sub-core 531 corresponding to at least the first insulating layer 54 may be a Kovar alloy, and the first insulating layer is raised. The sealing property between the 54 and the first sub-core 531; the second sub-core 532 can serve as a reel for winding the core material to form the core 52 on the surface of the second sub-core 532 without The reel is additionally provided, and the reel is not required to be taken out from the core 52, which saves manufacturing process and improves production efficiency.

The present application provides a battery of a seventh embodiment which differs from the battery disclosed in the above embodiments in that, as shown in FIG. 15, the mandrel 63 of the battery includes a first end portion 631 and a second end portion 632. The second end portion 632 includes at least one metal body 633 and at least one non-metal body 634. The metal body 633 and the non-metal body 634 may be fixed by screwing, bonding, or snapping, and are not limited herein. Wherein, the metal body 633 is disposed above the non-metal body 634; the material of the metal body 633 may be aluminum, copper or stainless steel, etc.; the material of the non-metal body 634 may be one of PP, PET, PE, PVC or PI or A variety.

Specifically, the second end portion 632 includes a metal body 633 and a non-metal body 634. The metal body 633 is disposed above the non-metal body 634, and the first end portion 631 is disposed above the metal body 633; wherein the material of the metal body 633 can be The same material as the first end portion 631. Since the non-metal body 634 of the mandrel 63 is disposed close to the outer casing 61, the metal body 633 of the mandrel 63 can be prevented from being directly short-circuited with the outer casing 61, thereby avoiding short circuit of the battery and improving the safety performance of the battery.

Compared with the insulating spacer 16 disclosed in the second embodiment, the battery of the embodiment can prevent the mandrel 63 from being short-circuited with the outer casing 61 by the non-metal body 634, avoiding the provision of the insulating spacer 16, which can reduce the volume of the battery and save space.

The present application provides a battery of an eighth embodiment which differs from the battery disclosed in the above embodiments in that, as shown in FIG. 16, the mandrel 73 of the battery includes a first end portion 731 and a second end portion 732. Wherein, the non-metal body 734 is disposed on the side of the second end portion 732, that is, the non-metal body 734 is disposed between the second end portion 732 and the winding core 72, and the non-metal body 734 and the second end portion 732 can pass between Fixed by screwing, snapping, bonding or interference fit. When the non-metal body 734 is disposed between the second end portion 732 and the winding core 72, the mandrel 73 can be further prevented from being short-circuited with the winding core 72, thereby preventing the mandrel 73 from being short-circuited with the outer casing 71, thereby avoiding short circuit of the battery and improving the battery. Security performance.

The material of the second end portion 732 may be aluminum, copper or stainless steel, etc.; the material of the non-metal body 734 may be one or more of PP, PET, PE, PVC or PI. The first end portion 731 is disposed above the second end portion 732, and the material of the second end portion 732 is the same as the material of the first end portion 731.

Compared with the second insulating layer 15 of the second embodiment covering the core 12, the process of covering the core 12 with the second insulating layer 15 is complicated, and the winding core 12 and the mandrel 13 may still be short-circuited; The non-metal body 734 of the embodiment is disposed on the side surface of the second end portion 732, so that the mandrel 73 can be prevented from being short-circuited with the winding core 72, thereby eliminating the short circuit of the battery.

In addition, there is a gap between the mandrel and the core disclosed in the first embodiment to the seventh embodiment. In this embodiment, a non-metal body 734 is disposed on the side of the second end portion 732 to avoid the mandrel 73 and the core 72. There is a gap between them so that the mandrel 73 and the core 72 are tightly fitted.

The present application provides a battery of a ninth embodiment, which is different from the battery disclosed in the above embodiment in that, as shown in FIG. 17, the core 82 includes a positive electrode tab 821, a negative electrode tab 822, and a diaphragm layer 823, wherein the diaphragm layer 823 Between the positive electrode tab 821 and the negative electrode tab 822, the diaphragm layer 823 is pressed against both ends of the winding core 82, that is, the diaphragm layer 823 is pressed against both ends of the positive electrode tab 821 or the diaphragm layer 823 is pressed against the negative electrode tab 822. end.

When the diaphragm layer 823 is pressed against both ends of the positive electrode tab 821, the width of the diaphragm layer 823 may be equal to the width of the positive electrode tab 821; when the diaphragm layer 823 is pressed against both ends of the negative electrode tab 822, the width of the diaphragm layer 823 may be The width of the negative electrode tab 822 is equal; wherein the width of the core 82 may be the width of the positive electrode tab 821 (since the thickness of the diaphragm layer 823 is extremely small, the width of the crimped layer 821 or the negative electrode tab 822 is negligible) .

In the prior art core, the width of the diaphragm layer is larger than the width of the negative electrode sheet, the width of the negative electrode sheet is larger than the width of the positive electrode sheet, and the width of the core is the same as the width of the diaphragm layer, so that the prior art core occupies the battery. The diaphragm layer 823 of the present embodiment is pressed on both ends of the core 82, that is, the width of the core 82 can be the width of the positive electrode sheet 821, which can reduce the volume occupied by the core 82, save space, and improve the battery. Energy Density.

The present application provides a battery of a tenth embodiment. As shown in FIG. 18, the battery 90 includes a housing 91, a winding core 92, a core shaft 93, and a first insulating layer 94. The outer casing 91 can be the outer casing disclosed in the above embodiment. The core 92 can be the core disclosed in the above embodiment. The first insulating layer 94 can be the first insulating layer disclosed in the above embodiment. Narration.

The first end portion 931 of the mandrel 93 is disposed through the through hole 911. The first end portion 931 may be the first end portion disclosed in the above embodiment, and details are not described herein.

Since the gap between the mandrel and the core disclosed in the above embodiment is present, the second end 932 of the mandrel 93 is provided with an opening 933. When the second end portion 932 of the mandrel 93 is fitted to the cavity 925 of the winding core 92, the opening 933 of the second end portion 932 is subjected to a reaming process, that is, the size of the opening 933 is increased to make the mandrel 93 The second end portion 932 expands outwardly and is press-fitted with the core 92 to avoid a gap between the mandrel 93 and the core 92 so that the mandrel 93 and the core 92 are tightly fitted.

The present application provides the battery of the eleventh embodiment, which is different from the battery disclosed in the tenth embodiment in that, between the first pole piece 921 and the second end portion 932 of the winding core 92, as shown in FIG. The second insulating layer 95 is not provided, wherein one end of the first pole piece 921 can be roughened to form a contact region 920 to increase the contact area of the contact region 920 and the second end portion 932; for example, the first pole piece 921 One end (head or tail) is coated adjacent to the side of the second end 932 to form a contact zone 920, as shown in FIG.

After the hole 933 of the second end portion 932 is subjected to the hole expanding process, the second end portion 932 is in contact with the contact portion 920 to connect the first pole piece 921 and the second end portion 932.

After the second end portion 932 is in contact with the contact region 920, the second end portion 932 and the contact region 920 receive a large current, so that the protrusions of the contact region 920 formed by the roughening process are melted under the action of current to realize high current welding. The first end portion 932 and the contact area 920 are improved in firmness.

The surface of the winding core 92 near the second end portion 932 can wind at least two turns of the first pole piece 921, and at least two turns of the first pole piece 921 are used to connect the first pole piece 921 and the second end portion 932 to prevent a large current. In the case of the diaphragm layer of the winding core 92, the safety performance of the battery 90 is improved.

In other embodiments, the second end portion 932 is roughened to the side of the first pole piece 921 to form a contact region; and/or after the hole 933 of the second end portion 932 is reamed, the first The pole piece 921 is in contact with the contact area, and the first pole piece 921 and the second end part 932 are connected.

The first pole piece 921 of the embodiment does not need to be provided with a tab, which reduces the volume occupied by the core 92 of the battery 90, saves space, and improves the energy density of the battery 90.

The present application provides the battery of the twelfth embodiment, which is different from the battery disclosed in the tenth embodiment in that, as shown in FIG. 21, the second pole piece 923 of the winding core 92 and the outer casing 91 are not provided with The second insulating layer 95, wherein one end of the second pole piece 923 can be roughened to form a contact region 922 to increase the contact area of the contact region 922 and the outer casing 91.

After the hole 933 of the second end portion 932 is subjected to the hole expanding process, the outer casing 91 is in contact with the contact portion 922, so that the second pole piece 923 and the outer casing 91 are connected.

After the outer casing 91 is in contact with the contact region 922, the outer casing 91 and the contact region 922 receive a large current, achieving high current welding, and increasing the contact area of the outer casing 91 with the contact region 922.

In other embodiments, the outer casing 91 is roughened to the side of the second pole piece 923 to form a contact area; after the hole 933 of the second end 932 is reamed, the second pole piece 923 and the contact area are formed. In contact, the second pole piece 923 and the outer casing 91 are connected.

The second pole piece 923 of the embodiment does not need to be provided with a tab, which reduces the volume occupied by the core 92 of the battery 90, saves space, and improves the energy density of the battery 90.

The present application provides the battery of the thirteenth embodiment. As shown in FIG. 22, the battery 100 includes a housing 101, a winding core 102, a mandrel 103, and a first insulating layer 104. The core 102 can be the core disclosed in the above embodiment, and the mandrel 103 can be the mandrel disclosed in the above embodiment. The first insulating layer 104 can be the first insulating layer disclosed in the above embodiment. No longer.

The battery 100 further includes at least one explosion-proof valve 105; the outer casing 101 is provided with at least one opening 1011, and the explosion-proof valve 105 is disposed on the opening 1011, wherein the explosion-proof valve 105 can be welded, cold-rolled or pasted on the opening 1011. The explosion-proof valve 105 can be a conductive metal foil, and the material of the explosion-proof valve 105 can be a conductive metal material such as aluminum, copper or stainless steel. In other embodiments, the explosion-proof valve 105 may be disposed on an outer surface of the outer casing 101 and disposed on the opening 1011.

When the battery 100 is short-circuited or heated, the pressure inside the battery 100 increases. When the pressure inside the battery 100 is greater than or equal to the threshold, the explosion-proof valve 105 is blasted to form a crack on the explosion-proof valve 105, releasing the pressure inside the battery 100, thereby The battery 100 is protected to improve the safety performance of the battery 100.

When the outer casing 101 includes the upper cover 1012, the housing 1013, and the lower cover 1014, the opening 1011 may be disposed on the upper cover 1012, the housing 1013, or the lower cover 1014.

The present application provides a battery of the fourteenth embodiment. As shown in FIG. 23, the battery 200 includes a housing 201, a winding core 202, a mandrel 203, and a first insulating layer 204. The core 202 can be the core disclosed in the above embodiment, and the mandrel 203 can be the mandrel disclosed in the above embodiment. The first insulating layer 204 can be the first insulating layer disclosed in the above embodiment. No longer.

The battery 200 further includes at least one explosion-proof structure 205. The explosion-proof structure 205 can be a groove disposed on the outer casing 201. The shape of the explosion-proof structure 205 can be C-shaped, D-shaped, L-shaped, T-shaped, circular, square, or Rectangular shape.

When the battery 200 is short-circuited or heated, the pressure inside the battery 200 is increased. When the pressure inside the battery 200 is greater than or equal to the threshold, the explosion-proof structure 205 is blasted to form a crack on the outer casing 201, releasing the pressure inside the battery 200, thereby protecting The battery 200 improves the safety performance of the battery 200.

An explosion-proof structure 205 is disposed on the upper cover 2011 of the outer casing 201, and the explosion-proof structure 205 is disposed around the mandrel 203, that is, the explosion-proof structure 205 can be a groove around the mandrel 203. When the explosion-proof structure 205 is blasted, the pressure inside the battery 200 separates the upper cover 2011 from the outer casing 201, so that the mandrel 203 and the tab connected to the mandrel 203 are disconnected, thereby protecting the battery 200 and improving the safety performance of the battery 200. .

The present application provides the battery of the fifteenth embodiment. The battery disclosed in this embodiment is different from the battery disclosed in the above embodiment in that the core 302 includes a first pole piece 3021 as shown in FIG. The first tab 3026 and the second tab 3027 connected to the second pole piece 3023 are disposed on the first pole piece 3021, and the second tab 3027 is disposed on the second pole piece 3023.

The first tab 3026 and/or the second tab 3027 may be a fusible tab 303, and the fusible tab 303 includes a fuse region 304. The fuse region 304 may be disposed at one end of the fusible tab 303 or may be disposed at The middle position of the tab 303 is blown.

When the fuse region 304 is disposed at an intermediate position of the fusible tab 303, the diameter of the fuse region 304 is smaller than the diameter of other regions of the fusible tab 303. When the battery current is too large, current flows through the fuse region 304 to generate heat, causing the fuse region 304 to be thermally fused, thereby protecting the battery and preventing the battery from being excessively current.

The fuse region 304 is disposed at one end of the fusible tab 303, that is, when the fuse region of the first tab 3026 or the solder joint of the second tab 3027 is provided with the fuse region 304. The battery current is too large, and current flows through the fuse region 304 to generate heat, causing the fuse region 304 to be thermally fused, thereby protecting the battery and avoiding excessive current of the battery.

The first tab 3026 and/or the second tab 3027 of the present embodiment may be a fusible tab 303. When the battery current is too high, current flows through the fuse region 304 to generate heat, causing the fuse region 304 to be thermally blown, thereby protecting Battery to avoid excessive battery current.

The present application provides the battery of the sixteenth embodiment. The battery disclosed in this embodiment is different from the battery disclosed in the above embodiment in that, as shown in FIG. 25, the core 402 includes a first pole piece 4021 and a second. The pole piece 4022 and the diaphragm layer 4023, the diaphragm layer 4023 is disposed between the first pole piece 4021 and the second pole piece 4022, and one end of the second pole piece 4022 is provided with an expansion area 4024, and the expansion area 4024 is provided with an expansion material, as shown in the figure 26 is shown. In FIG. 26, the expanded region 4024 is only a portion of the second pole piece 4022 in the width direction. It will be understood that in other embodiments, the expanded region 4024 may also be the same width as the second pole piece 4022. The intumescent material may be disposed in the expanded region 4024 by coating, bonding, or the like.

Wherein, the second pole piece 4022 is located outside the core 402; upon completion of the battery assembly, the expanded material of the expanded region 4024 is expanded such that the core of the battery, the core 402 and the outer casing are tightly assembled.

Wherein, the intumescent material may be a thermally expandable material, for example, the thermally expandable material is rubber; when the battery assembly is completed, the expanded region 4024 is heated to cause the thermally expandable material to expand.

The expansion material may be a solvent expansion material, and the solvent expansion material may be PVDF (Polyvinylidene) Fluoride, polyvinylidene fluoride) or VDF (Vinylidene Fluoride, difluoroethylene). Upon completion of the battery assembly, the solvent expansion material expands under the action of the electrolyte.

The expanded material can be an electromagnetically expanding material. Upon completion of battery assembly, the expansion region 4024 applies electromagnetic waves to cause the electromagnetic expansion material to expand.

One end of the second pole piece 4022 of the present embodiment is provided with an expansion region 4024, and the expansion region 4024 is provided with an expansion material; when the battery assembly is completed, the expansion material of the expansion region 4024 is expanded to make the core shaft of the battery and the core 402 Tightly assembled with the outer casing.

The present application provides the battery of the seventeenth embodiment. The battery disclosed in this embodiment is different from the battery disclosed in the above embodiment in that, as shown in FIG. 27, the mandrel 503 includes a first end 5031 and a second. The end portion 5032, the first end portion 5031 is exposed through the through hole 501, and the diameter of the first end portion 5031 is larger than the diameter of the second end portion 5032.

The diameter of the first end portion 5031 is large, and the contact area of the mandrel 503 can be increased. The diameter of the second end portion 5032 is smaller than the diameter of the first end portion 5031, which can reduce the space occupied by the second end portion 5032 and save space. To increase the energy density of the battery.

The present application provides the electronic device of the first embodiment. As shown in FIG. 28, the electronic device 700 includes a battery 701 for powering the electronic device 700. The battery 701 is the battery disclosed in any of the above embodiments. This will not be repeated here.

It should be noted that the above embodiments are all in the same inventive concept, and the descriptions of the respective embodiments are different, and the details are not described in the specific embodiments, and the descriptions in other embodiments may be referred to. It can be understood that the embodiments of the present application may be used alone or in combination with the technical features in other embodiments, and the combinations of the embodiments of the present application are still within the protection scope of the present invention.

The protection circuit and the control system provided by the embodiments of the present application are described in detail above. The principles and implementation manners of the present application are described in the specific examples. The description of the above embodiments is only used to help understand the method of the present application. And the core ideas of the present invention; at the same time, those skilled in the art, according to the idea of the present application, there will be changes in the specific embodiments and application scopes. In summary, the contents of this specification should not be construed as limits.

Claims (15)

A battery, characterized in that the battery comprises: a through hole is provided in the outer casing; a winding core disposed in the outer casing, the winding core at least comprising a first pole piece, a second pole piece and a cavity, the first pole piece being electrically connected to the outer casing, the outer casing being the battery First electrode a mandrel, the first end of the mandrel is exposed through the through hole, and the first end is fixedly disposed in the through hole through a first insulating layer; the second end of the mandrel is disposed Within the cavity, the second pole piece is electrically coupled to the mandrel, the mandrel being a second electrode of the battery. The battery according to claim 1, wherein said core further comprises a first tab connected to said first pole piece, a second tab connected to said second pole piece, and at least one diaphragm a layer, the first pole piece is connected to the outer casing through the first pole, the second pole piece is connected to the mandrel through the second pole, and the diaphragm layer is disposed on the first pole Between the sheet and the second pole piece. The battery according to claim 2, wherein said at least one diaphragm layer comprises a first diaphragm layer and a second diaphragm layer, said first pole piece, said first diaphragm layer, said second pole piece And the second separator layer are sequentially laminated. The battery according to claim 3, wherein said battery further comprises a second insulating layer overlying said winding core. The battery according to claim 3, wherein said battery further comprises a second insulating layer and a third insulating layer, said second insulating layer being disposed on a side of said winding core adjacent said mandrel The third insulating layer is disposed on an inner surface of the housing. The battery according to claim 3, wherein said battery further comprises an insulating spacer disposed between said second end and said outer casing. The battery according to claim 3, wherein the outer casing comprises an upper cover and a casing, and the upper cover is provided with the through hole, and the upper cover is fixed to the casing by welding. The battery according to claim 3, wherein the outer casing comprises a lower cover and a casing, the casing is provided with the through hole, and the lower cover is fixed to the casing by welding. The battery according to claim 3, wherein said outer casing comprises an upper cover, a casing and a lower cover, said upper cover is provided with said through hole, said upper cover and said lower cover They are respectively fixed to both sides of the casing by welding. The battery according to claim 3, wherein the first pole piece is a positive electrode piece, the second pole piece is a negative electrode piece, the outer casing is a positive electrode of the battery, and the mandrel is the The negative pole of the battery. The battery according to claim 3, wherein the first pole piece is a negative electrode piece, the second pole piece is a positive electrode piece, the outer casing is a negative electrode of the battery, and the mandrel is the The positive pole of the battery.  The battery according to claim 1, wherein said first end portion has a diameter smaller than a diameter of said second end portion. The battery according to claim 1, wherein said battery has a diameter of 3 to 50 mm and said battery has a height of 3 to 100 mm. The battery according to claim 1, wherein said battery further comprises an electrolyte and a liquid injection hole, said electrolyte being disposed in said outer casing, said liquid injection hole being disposed on said outer casing. An electronic device, comprising the battery of any of claims 1-14, the battery for powering the electronic device.