JP2013206844A - Electrode connection structure in laminate cell battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrode connection structure which can facilitate disconnection of electrodes while reducing the electrical contact resistance, and allows for secondary use of a laminate cell battery.SOLUTION: An electrode connection structure 1 connects the electrodes 11 of two laminate cell batteries 10. The electrode connection structure 1 includes a conductive connection tab 2 arranged so as to be in contact with both of two electrodes 11 being connected, and a press member 3 for pressing and holding the electrodes 11 and connection tab 2. The connection tab 2 is provided with a plurality of protrusions 25 formed to protrude toward the electrodes 11.

Description

  The present invention relates to an electrode connection structure for connecting electrodes in a laminated cell type battery.

  2. Description of the Related Art In recent years, power storage devices have been used in various applications such as a power source for driving a motor in an electric vehicle or the like and an emergency power source for home use. A laminate cell (pouch) type battery is known as one of the power storage elements constituting such a power storage device.

As a structure for connecting a plurality of laminated cell batteries constituting the power storage device, a structure in which the electrodes of the laminated cell batteries are joined by welding such as ultrasonic welding has become the mainstream.
Moreover, as an electrode connection structure in a laminate cell type battery other than welding, there is one shown in Patent Document 1. In this electrode connection structure, the electrodes are sandwiched and pressure-bonded by pressurizing and sandwiching means made of an insulating material.

JP 2010-118625 A

However, the electrode connection structure described above has the following problems.
In the case of an electrode connection structure using welding, since the electrodes are directly joined together, it is difficult to separate the connected electrodes. Therefore, when a defect occurs in some of the plurality of laminated cell batteries, it is not possible to remove and replace only the defective laminated cell battery. Therefore, when a defect occurs in some of the laminated cell batteries, the power storage device itself becomes defective. In addition, there is a problem in that the secondary use such as recycling of the laminated cell type battery cannot be performed and the environmental load increases.

  Further, different metal materials are used for the positive electrode and the negative electrode for the electrodes of the laminated cell type battery, and when the laminated cell type batteries are connected in series, it is necessary to weld electrodes made of different metals. In general, it is difficult to join dissimilar metals having different melting points by welding, so that poor welding is likely to occur, resulting in poor connection. Thus, when the electrical contact resistance between the electrodes increases, the electrodes generate heat, which may adversely affect the battery, such as a decrease in battery capacity.

  Moreover, in the electrode connection structure shown by patent document 1, there exists a possibility that electrical contact resistance may increase because electrodes do not carry out surface contact but contact locally. That is, the plate thickness of the electrode is not uniform, and there is a partial thickness variation. If the electrodes are sandwiched without absorbing this variation, point contact or line contact is likely to occur. Thus, when electrodes contact locally, the contact area between electrodes decreases and an electrical contact resistance increases. As a result, the electrode generates heat, which may adversely affect the battery, such as a decrease in battery capacity.

  The present invention has been made in view of the above background, can reduce the electrical contact resistance, can easily release the connection between the electrodes, secondary use of the laminated cell battery It is an object of the present invention to provide an electrode connection structure that can be made possible.

One aspect of the present invention is an electrode connection structure for connecting electrodes of a plurality of laminated cell batteries,
A conductive connection tab arranged to contact the electrode to be connected;
A pressing member that presses and holds the electrode and the connection tab;
In the electrode connection structure, the connection tab includes a plurality of protrusions formed to protrude toward the electrode.

  In the electrode connection structure, the electrodes can be connected to each other through the connection tab. That is, the plurality of protrusions provided on the connection tab may be formed by the plurality of protrusions biting into the electrode by the pressing force generated by the pressing member, or the plurality of protrusions may be deformed, or Two phenomena occur together. Thereby, variation in the plate thickness of the electrode and the size of each component can be absorbed, the contact area and the surface pressure between the electrode and the connection tab can be ensured, and the electrical contact resistance can be reduced.

  Further, as described above, the connection tab and each electrode are in close contact with each other by the pressing force of the pressing member, but since the welding that has been conventionally used is not performed, the pressing by the pressing member is released. Can easily separate the two.

  As described above, according to the above electrode connection structure, the electrical contact resistance can be reduced, the connection between the electrodes can be easily released, and the secondary use of the laminated cell type battery can be performed. Can do.

The elements on larger scale which show the electrode connection structure in Example 1. FIG. 1 is an overall view showing an electrode connection structure in Example 1. FIG. The components expanded view in the front view which shows the electrode connection structure in Example 1. FIG. FIG. 3 is a component development view in a side view showing the electrode connection structure in the first embodiment. In Example 1, (a) The top view which shows a protrusion part, (b) Sectional drawing equivalent to an AA arrow. BRIEF DESCRIPTION OF THE DRAWINGS FIG. The partial expanded sectional view which shows the electrode connection structure using the connection tab provided with an elastic body in Example 2. FIG. The top view of a connection tab provided with an elastic body in Example 2. FIG. The elements on larger scale which show the electrode connection structure in Example 3. FIG. FIG. 6 is a component development view showing an electrode connection structure in Example 3. In Example 3, (a) The top view which shows a protrusion part, (b) Sectional drawing equivalent to a BB line arrow. Explanatory drawing which shows the electrode connection structure in Example 4. FIG. The partial expanded sectional view which shows the electrode connection structure in Example 5. FIG. The partial expanded sectional view which shows the electrode connection structure in Example 6. FIG. The side view which shows the electrode connection structure in Example 6. FIG. The partial expanded sectional view which shows an example of the electrode connection structure of the laminated | stacked laminated cell type battery in Example 6. FIG. The partial expanded sectional view which shows the other example of the electrode connection structure of the laminated | stacked laminated cell type battery in Example 6. FIG. Explanatory drawing which shows the example of a shape of the rectangular-shaped protrusion part in Example 7. FIG. 18A is an explanatory diagram showing an example of the shape of the projecting portion projecting on both sides, and FIG. 18B is an explanatory diagram showing an example of the shape of the projecting portion projecting on one side (a cross-sectional view corresponding to CC arrow). ). Explanatory drawing which shows the example of a shape of the helical protrusion part in Example 7. FIG. Explanatory drawing which shows the example of a shape of the protrusion part of cantilever and both-ends in Example 7. FIG. In FIG. 21, (a) explanatory drawing showing an example of the shape of the protruding part protruding on both sides, (b) explanatory drawing showing an example of the shape of the protruding part protruding on one side (cross-sectional view corresponding to the DD line arrow) ). (A) Sectional drawing which shows an example of the protrusion part formed by bending process in Example 7, (b) Sectional drawing which shows the other example of the shape of the protrusion part formed by bending process. Explanatory drawing which shows an example of the electrode connection structure which connects the electrode of three laminate cell batteries. Explanatory drawing which shows the other example of the electrode connection structure which connects the electrode of three laminate cell type batteries.

  The laminate cell type battery shown in this specification is also called a pouch type battery, and can be constituted by various power storage structures such as a lithium ion battery and a capacitor.

  According to the electrode connection structure, a plurality of the electrodes arranged facing each other and the connection tab can be overlapped and connected. A plurality of the electrodes arranged side by side in the horizontal direction can be connected via the connection tab.

  Further, the connection tab may include a clamping portion that is clamped between the electrodes to be connected, and the protruding portions may be provided on both surfaces of the clamping portion. In this case, the projecting portions provided on both surfaces of the sandwiching portion by a simple assembling operation in which the sandwiching portion is disposed between the electrodes disposed to face each other and pressed by a pressing member. Can be reliably brought into contact with each electrode. Therefore, the assembly workability can be improved and the two electrodes can be easily connected reliably.

  The connection tab includes a pair of facing portions arranged so as to sandwich the electrode to be connected, and a connecting portion that connects the pair of facing portions, and the protruding portion is provided on at least one of the facing portions. It may be provided. (Claim 3). In this case, since the connection tab has the pair of opposed portions, the connection tab can be held by the electrode even in a state before the pressing member is arranged. Thereby, the assembly workability | operativity of the said electrode connection structure can be improved.

Moreover, when the said opposing part is provided, the arrangement | positioning freedom degree of the said laminate cell type battery can be improved. For example, not only the connection of the electrodes facing each other in the laminated cell type battery arranged in a stacked manner, but also the connection of electrodes arranged on the same surface in the laminated cell type battery arranged side by side it can.
Moreover, although the effect can be obtained by providing the protruding portion on at least one of the pair of opposed portions, it is more effective to provide the protruding portions on both of the pair of opposed portions.

  Further, the connection tab may include a terminal portion extending from the connection tab. In this case, the electric power supplied from the laminate cell type battery can be easily taken out from the terminal portion. Moreover, the voltage of each laminated cell type battery can be monitored by connecting a plurality of the laminated cell type batteries in series and providing the terminal portion on each connection tab.

  In addition, the pressing member may include a main body holding portion that extends toward the battery main body side of the laminated cell battery and is configured to hold the battery main body portion. In this case, the work of assembling the laminated cell battery can be easily performed by fixing the two laminated cell batteries. In addition, the battery body portion and the electrode are relatively moved by fixing the battery body portion and the electrode in the laminated cell type battery by the pressing member or suppressing the displacement therebetween. Can be prevented. Thereby, the vibration of the electrode can be prevented, and the vibration resistance of the laminate cell type battery can be further improved.

  Further, the pressing member may have electrical insulation (Claim 6). In this case, electrical contact between the electrode and the pressing member can be prevented. Therefore, in the state where the laminated cell battery is connected and charged, it is possible to prevent electrical contact to the electrode and the connection tab which are current-carrying parts, improving safety and easy handling. can do.

  Further, when a plurality of the laminated cell type batteries are fixed by the pressing members formed in a plurality, the adjacent energized portions may be connected and short-circuited if the pressing members have conductivity. In such a case, when the pressing member has electrical insulation, connection between adjacent electrodes can be prevented.

  The electrode connection structure includes a battery connecting member having a pressing holding portion that holds the pressing member and a battery holding portion that holds the battery body, and the laminated cell battery is held by the battery connecting member. (Claim 7). In this case, the work of assembling the laminated cell battery can be easily performed by fixing the two laminated cell batteries. Moreover, the battery main body part and the electrode relatively move by fixing the battery main body part and the electrode in the laminated cell type battery or suppressing the displacement between them by the battery connecting member. Can be prevented. Thereby, the vibration of the electrode can be prevented, and the vibration resistance of the laminate cell type battery can be further improved.

Example 1
An embodiment of an electrode connection structure in a laminate cell type battery will be described with reference to FIGS.
The electrode connection structure 1 is for connecting the electrodes 11 in a plurality of laminated cell batteries 10 as shown in FIG. The electrode connection structure 1 includes a connection tab 2 that is disposed so as to be in contact with the electrode 11 to be connected and has conductivity, and a pressing member 3 that presses and holds the electrode 11 and the connection tab 2. The connection tab 2 includes a plurality of protrusions 25 that protrude toward the electrode 11.

The electrode connection structure 1 of this example will be described in more detail.
As shown in FIGS. 1 and 2, the laminated cell battery 10 connected by the electrode connection structure 1 includes a flat battery body 12 having a substantially rectangular shape and a pair of sides of the battery body 12 in opposite directions. The positive electrode 111 and the negative electrode 112 which are two electrodes which protrude toward the surface are provided.
The battery body 12 is formed by alternately laminating positive electrodes 111 and negative electrodes 112 forming electrodes and separators (not shown), and encapsulating them in a laminate material such as an aluminum sheet together with an electrolytic solution.

  The positive electrode 111 and the negative electrode 112 constituting the electrode 11 are formed of different metal materials. In this example, the positive electrode 111 is made of aluminum, and the negative electrode 112 is made of copper plated with nickel. In addition, the metal material used for the electrode 11 is not limited to this, The various metal material which can form the laminate cell type battery 10 can be used. In addition, the electrode 11 may be disposed on one side of the battery main body 12 with both the positive electrode 111 and the negative electrode 112, or may be disposed on adjacent sides.

  As shown in FIG. 2, a plurality of laminated cell type batteries 10 are stacked and adjacent laminate cell type batteries 10 are connected in series. Therefore, the positive electrode 111 and the negative electrode 112 are connected to the electrodes 11 of the adjacent laminated cell batteries 10, respectively. Further, the electrodes 110 in the laminated cell type battery 10 disposed at both ends in the stacking direction are connected to a load such as a charging device or an inverter (not shown).

  As shown in FIGS. 1 and 3, the electrode 11 of the laminated cell battery 10 includes a portion formed along the protruding direction, a portion formed from the tip toward the electrode 11 connected, and the tip. And a connection surface 113 formed along the protruding direction of the electrode 11. A gap is formed between the connection surfaces 113 of the electrodes 11 in the two laminated cell batteries 10 to be connected.

  As shown in FIGS. 3 to 5, the connection tab 2 that connects the electrodes 11 includes a sandwiching portion 21 that is disposed in a gap formed between the adjacent electrodes 11, and an engagement portion that engages with each electrode 11. 211 and a terminal portion 24 extending from the sandwiching portion 21.

  As shown in FIGS. 5A and 5B, the sandwiching portion 21 has a flat plate shape, and includes a plurality of protruding portions 25 (a) and 25 (b) protruding toward the electrode 11. Yes. A plurality of the projecting portions 25 (a) and 25 (b) are provided so as to extend from the inner circumference of the substantially circular through hole formed in the sandwiching portion 21 toward the center in a reverse radial manner. 21 and a free end 252 arranged so as to be separated from the holding part 21. Flat portions 258 (a) and 258 (b) that are substantially parallel to the electrode 11 when assembled are formed in a portion near the free end 252. The projecting portions 25 (a) and 25 (b) are formed so that the planar portions 258 (a) and 258 (b) project from both surfaces of the sandwiching portion 21, and project from the adjacent projecting portions 25 (a). It arrange | positions so that the part 25 (b) may protrude toward the electrode 11 on the opposite side alternately.

  As shown in FIG. 3 and FIG. 4, the engaging portion 211 is formed at the end portion disposed on the tip end side of the electrode 11 in the sandwiching portion 21, and the portion standing from the sandwiching portion 21 toward each electrode 11. And a portion formed from the distal end portion toward the proximal end portion side of each electrode 11, and has a substantially L-shaped cross section. When the connection tab 2 is assembled to the electrode 11, the connection tab 2 can be held on the electrode 11 by engaging the engaging portion 211 with the tip of the electrode 11.

  As shown in FIG. 4, the terminal portion 24 is disposed on one of the end portions adjacent to the end portion where the engaging portion 211 is disposed in the sandwiching portion 21. The terminal portion 24 has a strip shape that is narrower than the sandwiching portion 21. Each connection tab 2 shown in this example includes a terminal portion 24, and each terminal portion 24 is connected to a voltage monitoring line or the like.

  As shown in FIGS. 3 and 4, the pressing member 3 that presses and holds the connection tab 2 and the two electrodes 11 sandwiching the connection tab 2 is made of phosphor bronze, and the surface thereof is covered with an insulating resin. The pressing member 3 includes a pressing main body portion 31 having a substantially U-shape and a pair of pressing portions 32 formed by folding back from both ends of the pressing main body portion 31. In the state before assembly, the distance S between the pair of pressing portions 32 is set to be smaller than the thickness t (FIG. 3) when the sandwiching portion 21 and the electrode 11 are overlapped. Therefore, when the clamping part 21 and the electrode 11 are arranged between the pair of pressing parts 32, a reaction force is generated in the pressing member 3, and the clamping part 21 and the electrode 11 are pressed and held.

  In this example, the laminated cell type batteries 10 are connected in series. However, when connected in parallel, as shown in FIG. 6, a plurality of laminated cell type batteries are connected by the connection tab 2 having two or more sandwiching portions 21. 10 can also be connected.

Hereinafter, the function and effect of this example will be described.
In the electrode connection structure 1, the electrodes 11 can be connected to each other via the connection tab 2. That is, the plurality of protrusions 25 provided on the connection tab 2 may be formed by the plurality of protrusions 25 biting into the electrode 11 due to the pressing force generated by the pressing member 3, or the plurality of protrusions 25 may be deformed. Two phenomena occur together. Thereby, the plate | board thickness in the electrode 11 and the dispersion | variation in the dimension in each component can be absorbed, the contact area and surface pressure of the electrode 11 and the connection tab 2 can be ensured, and electrical contact resistance can be reduced.

  In addition, as described above, the connection tab 2 and each electrode 11 are in close contact with each other by the pressing force of the pressing member 3, but since the welding that has been conventionally used is not performed, the pressing by the pressing member 3 is released. Thus, the connection of each electrode 11 can be easily released. Therefore, secondary use of the laminate cell type battery 10 is possible.

  In addition, the connection tab 2 includes a sandwiching portion 21 that is sandwiched between the two electrodes 11 to be connected, and protrusions 25 are provided on both surfaces of the sandwiching portion 21. Therefore, the projecting portions 25 provided on both surfaces of the sandwiching portion 21 are arranged by a simple assembling operation in which the sandwiching portion 21 is disposed between the two electrodes 11 disposed to face each other and these are pressed by the pressing member 3. Can be reliably brought into contact with each electrode 11. Therefore, the assembly workability can be improved and the two electrodes 11 can be easily connected with certainty.

  The connection tab 2 includes a terminal portion 24 extending from the connection tab 2. Therefore, the electric power generated by the laminate cell type battery 10 can be easily taken out from the terminal portion 24. Moreover, as shown in this example, the terminal part 24 is provided in each connection tab 2, and the voltage of each laminate cell type battery 10 can be monitored by connecting to the voltage monitoring line.

  Further, the pressing member 3 has electrical insulation. Therefore, electrical contact between the electrode 11 and the pressing member 3 can be prevented. Therefore, in the state where the laminated cell battery 10 is connected and charged, it is possible to prevent contact with the electrode 11 and the connection tab 2 which are the current-carrying parts, improve safety, and facilitate handling. Can do.

  As described above, according to the electrode connection structure 1 of the present example, the electrical contact resistance can be reduced, the connection between the electrodes 11 can be easily released, and the secondary use of the laminated cell battery can be performed. Can be possible.

(Example 2)
In this example, the elastic member 26 is provided on the connection tab 2 in the first embodiment.
As shown in FIGS. 7 and 8, the connection tab 2 has an annular shape between the projecting portion 25 (a) and the projecting portion 25 (b) formed so as to project from the holding portion 21 toward both sides. An elastic member 26 is provided.

As shown in FIGS. 7 and 8, the elastic member 26 has an annular shape and is formed of a rubber material having insulating properties and heat resistance. The elastic member 26 preferably has small changes in compression set and elastic modulus. The elastic member 26 is sandwiched between the flat portion 258 (a) and the flat portion 258 (b) in the protruding portion 25 (a) and the protruding portion 25 (b).
Other configurations are the same as those of the first embodiment.

  In the electrode connection structure of this example, by using the elastic member 26 that is elastically deformed, the protrusions 25 (a) and 25 (b) of the connection tab 2 and the electrode 11 of the laminated cell battery 10 are generated by the elastic force. The contact area and the contact surface pressure can be reliably ensured. In addition, the elastic deformation force of the elastic member 26 can be adjusted by changing the dimension, material, etc. of the elastic member 26, and the contact area and the contact surface pressure of the connection tab 2 and the electrode 11 can be changed suitably.

In addition, the plurality of protrusions 25 (a) and 25 (b) can be brought into contact with the electrode 11 at the same time by utilizing the elastic deformation of the elastic member 26. Thereby, the electrode 11 and the connection tab 2 can be reliably connected and made conductive. Thus, by reliably connecting the plurality of protrusions 25 (a) and 25 (b) to the electrode 11 and conducting, and increasing the contact area and the contact surface pressure between the electrode 11 and the connection tab 2, The electrical contact resistance between the electrode 11 and the connection tab 2 can be further reduced.
Moreover, the same effect as Example 1 can be obtained.

(Example 3)
This example is an example of the electrode connection structure 1 in which the shape of the connection tab 201 in the first embodiment is changed.
As shown in FIGS. 9 and 10, the electrodes 11 of the two laminated cell type batteries 10 to be connected are formed so that their connection surfaces 113 are in contact with each other.

As shown in FIG. 10, the connection tab 201 has a substantially U-shaped cross-sectional shape including a pair of facing portions 22 arranged so as to sandwich the connection surface 113 and a connecting portion 23 connecting the pair of facing portions 22. There is no. As shown in FIG. 11A and FIG. 11B, the pair of opposed portions 22 are formed with a plurality of projecting portions 25 that project toward the electrode 11 disposed inside thereof. In this example, the plurality of protrusions 25 formed in each facing portion 22 are formed so as to protrude in the same direction toward the electrode 11.
Other configurations are the same as those of the first embodiment.

  In the electrode connection structure 1 of this example, the connection tab 201 includes a pair of facing portions 22 arranged so as to sandwich the two electrodes 11 to be connected, and a connecting portion 23 that connects the pair of facing portions 22. Therefore, the connection tab 201 can be held on the electrode 11 even before the pressing member 3 is arranged, because the connection tab 201 has the pair of facing portions 22. Thereby, the assembly workability | operativity of the electrode connection structure 1 can be improved.

Further, the projecting portions 25 are provided on both of the facing portions 22 in the connection tab 201. Thereby, the contact area and contact surface pressure of the connection tab 201 and the electrode 11 can be increased more, and electrical contact resistance can be reduced.
Moreover, the same effect as Example 1 can be obtained.

Example 4
This example shows an electrode connection structure 1 having a battery connecting member 4 that holds a plurality of laminated cell batteries 10.
The electrode 11 and the connection tab 201 shown in this example have the same shape as that of the third embodiment.
As shown in FIG. 12, the battery connecting member 4 is formed of a resin material, and includes a pressure holding portion 41 that holds the pressing member 3, a battery holding portion 42 that holds the battery main body portion 12, a pressure holding portion 41, and a battery. A connecting extension portion 44 is provided so as to connect the holding portion 42.

  The press holding portion 41 has a substantially U shape corresponding to the outer shape of the pressing member 3, and is configured to be able to insert and hold the pressing member 3 from the opening 411. At the pair of opening ends of the opening portion 411 of the press holding portion 41, a connection extending portion 44 extending toward the outer surface 14 side of the two laminated cell batteries 10 to be connected is formed.

  The connecting extension 44 extending from the pair of opening ends includes an inclined surface 441 extending from the opening end of the opening 411 toward the outer surface 14, and the longitudinal direction of the laminated cell battery 10 from the tip of the inclined surface 441. , And an inclined surface 443 extending from the tip of the vertical surface 442 further toward the outer surface 14 side.

The battery holding portions 42 extending from the end portions of the inclined surfaces 443 of the pair of connection extending portions 44 are formed along the outer side surfaces 14 of the two laminated cell batteries 10 to be connected. The pair of battery holding portions 42 are configured to sandwich the outer surfaces 14 of the two laminated cell batteries 10 to be connected.
Other configurations are the same as those of the first embodiment.

The electrode connection structure 1 of this example includes a battery connecting member 4 having a pressing holding portion 41 that holds the pressing member 3 and a battery holding portion 42 that holds the battery main body portion 12, and the laminated cell type battery 10 is a battery connecting member. 4 is held. Therefore, by assembling the two laminated cell type batteries 10, the assembling work of the laminated cell type battery 10 can be easily performed. Moreover, the battery main body part 12 and the electrode 11 in the laminate cell type battery 10 are fixed by the battery connecting member 4, so that the battery main body part 12 and the electrode 11 can be prevented from relatively moving. Thereby, the vibration resistance of the laminate cell type battery 10 can be further improved.
Moreover, the same effect as Example 1 can be obtained.

(Example 5)
This example shows the electrode connection structure 1 in which the configuration of the pressing member 3 is changed.
As shown in FIG. 13, the pressing member 3 shown in this example is formed of a resin material, and a pressing portion 32 that presses the electrode 11 on which the connection tab 201 is arranged, and two laminates connected from the pressing portion 32. And a main body holding portion 33 disposed along the outer surface of the battery main body portion 12 in the cell type battery 10. The electrode 11 and the connection tab 201 in this example have the same shape as in the third embodiment.

As shown in FIG. 13, the pressing portion 32 includes a pair of pressing facing portions 321, a pressing connecting portion 322 that connects the distal ends of the pressing facing portions 321, and a main body holding portion 33 that holds the laminated cell battery 10. Yes.
The interval between the pair of pressing opposing portions 321 is set smaller than the width of the connection tab 201 arranged on the electrode 11 in a state before assembly. Therefore, when the connection tab 201 and the electrode 11 are arranged between the pair of pressing facing portions 321, a pressing force is applied from the pressing facing portion 321 to the connection tab 201 and the electrode 11.

  As shown in FIG. 13, at the ends of the pair of pressing facing portions 321 opposite to the pressing connection portions 322, the pressing extension portions 34 extending toward the outer surface 14 side of the two laminated cell batteries 10 to be connected. Are formed respectively.

  The pressing extension 34 extending from the pair of pressing facing portions 321 includes an inclined surface 341 extending from the pressing facing portion 321 toward the outer surface 14, and a longitudinal direction of the laminated cell type battery 10 from the tip of the inclined surface 341. , And an inclined surface 343 extending further from the tip of the vertical surface 342 toward the outer surface 14 side.

The main body holding portions 33 respectively extending from the end portions of the inclined surfaces 343 of the pair of press extending portions 34 are formed along the outer side surfaces 14 of the two laminated cell batteries 10 to be connected. The pair of main body holding portions 33 are configured to sandwich the outer side surfaces 14 of the two laminated cell batteries 10 to be connected.
Other configurations are the same as those of the first embodiment.

The pressing member 3 in the electrode connection structure 1 of the present example includes a main body holding portion 33 that extends to the battery main body portion 12 side of the laminated cell type battery 10 and is configured to hold the battery main body portion 12. Therefore, by assembling the two laminated cell type batteries 10, the assembling work of the laminated cell type battery 10 can be easily performed. In addition, by fixing the battery body 12 and the electrode 11 in the laminated cell battery 10 with the pressing member 3, it is possible to prevent the battery body 12 and the electrode 11 from moving relatively. Thereby, the vibration resistance of the laminate cell type battery 10 can be further improved.
Moreover, the same effect as Example 1 can be obtained.

(Example 6)
This example shows an electrode connection structure 1 for connecting electrodes in two laminated cell batteries 10 arranged side by side as shown in FIG.
As shown in FIGS. 14 and 15, the electrode 11 of the laminated cell battery 10 is not bent and is on a smooth flat plate.
As shown in FIG. 15, the laminated cell type battery 10 is arranged side by side in a direction perpendicular to the arrangement direction of the electrodes 11 on the same plane, and the electrodes 11 arranged adjacent to each other on the same plane are connected to the connection tab 201. Connected by.

  As shown in FIGS. 14 and 15, the connection tab 201 that connects the electrodes 11 of the laminated cell battery 10 has a substantially U-shaped cross-sectional shape including a pair of facing portions 22 and a coupling portion 23. The electrodes 11 are formed so as to extend in the direction in which the laminated cell type batteries 10 are arranged and to be connected. In the pair of facing portions 22, a plurality of protruding portions 25 are formed at positions corresponding to the electrodes 11. In addition, the shape of the protrusion part 25 in this example is the same as the shape shown in Example 3.

  As shown in FIG. 14, the battery connecting member 4 is configured so that two laminated cell batteries 10 connected side by side can be further stacked and held. The battery connecting member 4 includes a pressing holding portion 41 that holds the pressing member 3 and a pair of pressing receiving portions 43 that are arranged inside the pressing member 3. The pair of press receiving portions 43 are arranged side by side in a direction orthogonal to the plane of the laminated cell type battery 10 arranged on the battery connecting member 4, and the connection tab 201 is arranged along the surface located on the outside thereof. An electrode 11 is disposed. Other configurations of the battery connecting member are the same as those in the fifth embodiment.

  The pressing member 3 includes a substantially U-shaped pressing main body portion 31 and a pair of pressing portions 32 formed by folding back from both ends of the pressing main body portion 31 inward. The pair of pressing portions 32 are formed so as to face the surfaces positioned on the outside of the pair of pressing receiving portions 43 included in the battery connecting member 4. Therefore, the connection tab 201 and the electrode 11 are pressed and held by being sandwiched between the pressing portion 32 and the pressing receiving portion 43.

Further, as shown in FIG. 16, when the laminated cell batteries 10 connected side by side are stacked and connected, the electrodes 11 of the laminated cell batteries 10 arranged in a stacked manner are respectively connected to the pair of press receiving portions 43. They are arranged along the inner surface and connected by connection tabs 204.
The connection tab 204 has a spring property, and has a substantially U-shape including a pair of contact portions 205 and a connecting portion 206 that connects the pair of contact portions 205. The pair of contact portions 205 are each formed with a plurality of protruding portions 25 protruding toward the opposite side to the facing direction.

  The distance between the outer surfaces of the pair of contact portions 205 is set to be larger than the distance between the inner surfaces of the pair of press receiving portions 43. Therefore, when the connection tab 204 is inserted and arranged inside the press receiving portion 43, the pair of contact portions 205 are pressed by the press receiving portion 43. That is, the pressure receiving portion 43 serves as a pressing member, and the connection tab 204 and the electrode 11 can be pressed to connect both.

In addition, as shown in FIG. 17, the pair of contact portions 205 may be disposed along the outer surface of the press receiving portion 43, and the electrode 11 may be disposed between the contact portion 205 and the press receiving portion 43. The protruding portion 25 of the contact portion 205 shown in the figure protrudes in the opposing direction of the pair of contact portions 205. The distance between the inner surfaces of the contact portion 205 is set to be smaller than the distance between the outer surfaces of the pair of press receiving portions 43.
Other configurations are the same as those of the first embodiment.

  In this example, the pressing member 3 is arranged on the battery connecting member 4 in advance, and each electrode 11 is connected by inserting the electrode 11 provided with the connection tab 201 between the pressing receiving portion 43 and the pressing portion 32. be able to. At this time, the connection tab 201 serves as a reinforcing material that reinforces the electrode 11, so that deformation of the electrode 11 can be prevented and assembly workability can be improved.

In addition, since the pressure receiving portion 43 is provided and the electrode 11 on which the connection tab is arranged is pressed by the pressure receiving portion 43 and the pressing portion 32, the arrangement position of the electrode 11 is set according to the arrangement position of the pressure receiving portion 43. Can be set to position. Thereby, the electrode 11 can be made into a smooth flat plate, and a bending part can be abolished. Therefore, the productivity of the laminate cell type battery 10 can be improved.
Also in this example, the same effects as those of the first embodiment can be obtained.

(Example 7)
This example shows a shape example of the protruding portion 25 in the connection tab 2.
FIG. 18, FIG. 19A and FIG. 19B show examples of the shape of the protrusion 25 formed in a rectangular shape in plan view.
The protrusion 25 extends from one side of the inner periphery of the rectangular through hole, and has a connection end 251 connected to the connection tab 2 and a free end 252 arranged away from the connection tab 2. Yes. The free end 252 side is arranged so as to protrude toward the electrode 11, and in the connection tab 2 including the clamping portion 21 arranged between the electrodes 11, as shown in FIG. It is effective to make it protrude. Moreover, in the connection tab 2 provided with the opposing part 22 arrange | positioned so that the electrode 11 may be pinched | interposed, as shown in FIG.19 (b), it is effective to make it protrude toward the side where the electrode 11 is arrange | positioned.

FIG. 20 shows an example of the shape of the projecting portion 25 formed in a spiral shape.
The projecting portion 25 extends from the inner periphery of the circular through-hole so as to be inclined in a direction deviated from the center point thereof, and is arranged apart from the connection tab 251 connected to the connection tab 2 and the connection tab 2. And a free end 252 formed. Also in this shape, in the connection tab 2 provided with the clamping part 21 arrange | positioned between the electrodes 11, it is effective to make it protrude from both surfaces. Further, in the connection tab 2 having the facing portion 22 arranged so as to sandwich the electrode 11, it is effective to protrude toward the side where the electrode 11 is arranged.

21, FIG. 22 (a) and FIG. 22 (b) show a protrusion 25 having a protrusion 253 having a connection end 251 and a free end 252 and a protrusion 254 formed between the connection ends 251. FIG. The example of a shape is shown.
Four protrusions 253 are extended from the inner periphery of the circular through-hole toward the center thereof, and are separated from the connection tab 251 connected to the connection tab 2 as described above. And a free end 252 arranged.

As shown in FIG. 21, a protrusion 254 is formed between the four protrusions 253. The protruding portion 254 has four connecting ends 251 arranged at positions adjacent to the connecting ends 251 of the four protruding portions 253, and is formed in a substantially cross shape so as to connect the connecting ends 251.
In the case of this shape, as shown in FIG. 22 (a), in the connection tab 2 provided with the clamping part 21 arranged between the electrodes 11, the protruding part 253 and the protruding part 254 are protruded in the opposite directions. Is effective. Moreover, in the connection tab 2 provided with the opposing part 22 arrange | positioned so that the electrode 11 may be pinched | interposed, it is effective to protrude the protrusion part 253 and the protrusion part 254 toward the side where the electrode 11 is arrange | positioned.

FIG. 23A and FIG. 23B show examples of the shape of the protrusion 25 formed by bending.
The protrusions 25 described above are formed by cutting and raising the protrusions 25, but the protrusions 25 shown in FIGS. 23A and 23B are formed by bending. .

The projecting portion 25 shown in FIG. 23A includes a contact surface 255 formed on two parallel planes, and an inclined surface 256 that connects ends of the contact surfaces 255 to each other. In this shape, the angle between the contact surface 255 and the inclined surface 256 is formed to be an acute angle.
The protrusions 25 shown in FIG. 23B have a corrugated shape in which arc portions 257 that protrude toward the opposite side are alternately arranged.

  Since the protruding portions 25 shown in FIGS. 23A and 23B are formed so as to protrude from both surfaces, the connecting tab 2 having either the clamping portion 21 or the facing portion 22 has the same shape. be able to.

  Also in the protrusion part 25 shown in this example, the effect similar to the effect by providing the protrusion part 25 shown in above-mentioned Example 1- Example 6 can be obtained.

In the cantilever protrusion 25 having the free end 252 and the connection end 251, the protrusion 25 can be more easily deformed. Therefore, the electrode 11 and the connection tab 2 can be reliably connected with a smaller pressing force, and the electrical contact resistance can be reduced.
The cantilever protrusion 25 shown in this example has a free end 252 and a flat portion 258 formed on the same plane, but the free end 252 is connected to the connection end 251 side. An inclined surface connecting the end 251 and the flat portion 258 may be provided. In this case, the assembling property between the electrode 11 and the connection tab 2 can be improved.

  Further, in the both-sided protruding portion 25 shown in FIGS. 21, 22 (a) and 22 (b), the pressing force applied to the protruding portion 25 can be more reliably transmitted to the electrode 11. Therefore, the contact area and contact surface pressure between the electrode 11 and the connection tab 2 can be ensured, and the electrical contact resistance can be reduced. In addition, although the above-mentioned protrusion part 254 is provided with the four connection ends 251, if the at least one pair of connection ends 251 is provided, the both-ends protrusion part 25 can be formed.

  The protrusion part shown in Example 1- Example 7 is an example, The arrangement | positioning, a shape, and a number can be formed with various patterns besides having mentioned above. In order to increase the contact area between the connection tab and the electrode, it is preferable to increase the number of protrusions.

  Further, as shown in FIGS. 24 and 25, the number of laminated cell type batteries to be connected is not limited to two, and may be three or more. Moreover, you may increase the number of the opposing parts and clamping parts in a connection tab according to the number of the laminate cell type batteries to connect.

  Further, the pressing member is not limited to the above configuration, and various materials and shapes can be used. Examples of the material used for the pressing member include various materials such as a metal material having a spring property, a rigid metal material, and a resin material. Also, two or more kinds of materials can be combined and formed by insert molding or the like. In order to reduce the electrical contact resistance between the connection tab and the electrode, it is preferable to set the pressing force of the pressing member sufficiently large to increase the contact area.

DESCRIPTION OF SYMBOLS 1 Electrode connection structure 10 Laminated cell type battery 11 Electrode 2, 201, 202, 204 Connection tab 25, 25 (a), 25 (b) Projection part 3, 30 Press member

Claims (7)

An electrode connection structure for connecting electrodes of a plurality of laminated cell batteries,
A conductive connection tab arranged to contact the plurality of electrodes to be connected;
A pressing member that presses and holds the electrode and the connection tab;
The electrode connection structure, wherein the connection tab includes a plurality of protrusions formed to protrude toward the electrode.   2. The electrode connection structure according to claim 1, wherein the connection tab includes a sandwiching portion sandwiched between the electrodes to be connected, and the protruding portions are provided on both surfaces of the sandwiching portion. A featured electrode connection structure.   The electrode connection structure according to claim 1 or 2, wherein the connection tab includes a pair of facing portions arranged so as to sandwich the electrode to be connected and a connecting portion that connects the pair of facing portions. An electrode connection structure, wherein the protruding portion is provided on at least one of the facing portions.   The electrode connection structure according to any one of claims 1 to 3, wherein the connection tab includes a terminal portion extending from the connection tab.   5. The electrode connection structure according to claim 1, wherein the pressing member is configured to extend to a battery main body side of the laminated cell battery and to hold the battery main body. An electrode connection structure comprising a main body holding part.   The electrode connection structure according to claim 1, wherein the pressing member has electrical insulation.   7. The electrode connection structure according to claim 1, further comprising: a battery connecting member having a pressing holding portion that holds the pressing member and a battery holding portion that holds the battery main body portion, and the laminate cell. An electrode connection structure, wherein the battery is held by the battery connecting member.

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