WO2025066532A1 - Composite pole terminal structure and battery cell top cover structure - Google Patents

Abstract

A composite pole terminal structure (200) and a battery cell top cover structure. The composite pole terminal structure (200) specifically comprises a first pole terminal (21) and a second pole terminal (22); the first pole terminal (21) comprises a base (211) and a protrusion (212) located on the base (211); a groove (221) is provided on the side of the second pole terminal (22) close to the first pole terminal (21), the protrusion (212) being in threaded connection to the groove (221).

Description

Composite pole structure and battery top cover structure

This application claims the priority of the Chinese patent application filed with the China Patent Office on September 28, 2023, with application number 202322678064.4. The entire contents of the above application are incorporated by reference into this application.

Technical Field

The present application relates to the field of battery technology, and in particular to a composite pole structure and a battery cell top cover structure.

Background Art

In the related art, the manufacturing method of the copper-aluminum composite pole is to use a mold to stamp the copper-aluminum composite material into a copper-aluminum composite pole, or to weld a copper part and an aluminum part to obtain a copper-aluminum composite pole.

SUMMARY OF THE INVENTION

However, the cost of copper-aluminum composite materials is high, and the peel strength of copper-aluminum composite materials is low, which has the risk of composite failure; and the welding of copper and aluminum parts is prone to welding deformation and cracks at the welding interface, affecting the safety of the copper-aluminum composite pole.

In a first aspect, the present application provides a composite pole structure, comprising a first pole and a second pole, wherein the first pole comprises a base and a protrusion located on the base; a groove is provided on a side of the second pole close to the first pole; wherein the protrusion is connected to the groove by a thread.

In a second aspect, the present application further provides a battery cell top cover structure, including a top cover sheet, wherein the top cover sheet is provided with a pole hole, and the above-mentioned composite pole structure is arranged in the pole hole.

Beneficial Effects

The composite pole structure provided by the present application specifically includes a first pole and a second pole, the first pole includes a base and a protrusion located on the base; a groove is provided on a side of the second pole close to the first pole; wherein the protrusion and the groove are connected by threads, thereby forming a composite pole structure by the first pole and the second pole connected by threads, thereby improving the pulling strength of the composite pole structure, reducing the risk of composite failure of the contact interface of the first pole and the second pole, and avoiding the problem of welding deformation, which can simplify the production process, improve production efficiency, and reduce production costs.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of an embodiment of a battery cell top cover structure provided by an implementation of the present application;

FIG2 is a schematic diagram of an embodiment of a first pole of an implementation of the present application;

FIG3 is a cross-sectional schematic diagram of a first pole in an implementation of the present application;

FIG4 is a schematic diagram of an embodiment of a second pole of an implementation of the present application;

FIG5 is a cross-sectional schematic diagram of a second pole according to an implementation of the present application.

Embodiments of the present invention

Since the cost of using copper-aluminum composite materials to make composite poles in the related art is relatively high, there is a risk of composite failure, and the composite poles formed by welding copper and aluminum parts are prone to deformation, for this reason, an embodiment of the present application provides a composite pole structure and a battery cell top cover structure, in which a first pole and a second pole connected by threads form a composite pole structure, which improves the pulling strength of the composite pole structure, reduces the risk of composite failure at the contact interface of the first pole and the second pole, and avoids the problem of welding deformation. It can simplify the production process, improve production efficiency, and reduce production costs. For specific solutions, please refer to the following specific description.

It should be noted that, hereinafter, the terms "battery module", "battery", "battery element", "battery cell" and "battery pack" can be used interchangeably and can refer to any of a variety of different rechargeable battery chemistries and structures, including but not limited to lithium ion (e.g., lithium ion phosphate, lithium cobalt oxide, lithium iron phosphate, other lithium metal oxides, etc.), lithium ion polymer, nickel metal hydride, nickel cadmium, nickel metal hydride, nickel zinc, silver zinc or other battery types/structures. The term "electric vehicle" is used here to refer to a fully electric vehicle, also known as an EV, a plug-in hybrid vehicle, also known as a PHEV, or a hybrid electric vehicle (HEV), wherein the hybrid vehicle uses multiple propulsion sources, one of which is an electric drive system.

Embodiments of the present application are generally applicable to systems using electric motors, and more specifically, but not exclusively, to electric vehicles using multiphase electric motors (e.g., inductive motors). Electric vehicles use one or more stored energy sources such as battery packs to provide electrical energy to the vehicle. This energy is at least partially used to propel the vehicle. The stored energy can also be used to provide energy required by other vehicle systems, such as vehicle lighting, vehicle partitionable heating, ventilation and air conditioning (HVAC) systems, auxiliary control systems (e.g., sensors, displays, navigation systems, etc.), vehicle entertainment systems (e.g., radio, DVD, MP3, etc.), etc. Conventional electric vehicles include passenger vehicles and vehicles designed to transport goods, examples of which include passenger cars, trucks, electric bicycles, and recreational boats. Electric vehicles also include dedicated work vehicles and carts, some of which can be integrated with forklifts, scissor lifts, lifting and/or articulated boom aerial work platforms, street cleaning systems, conveyor belts, and flatbed handling platforms.

Specifically, please refer to Figure 1, which is a schematic diagram of an embodiment of a battery cell top cover structure provided in an embodiment of the present application. The battery cell top cover structure specifically includes a top cover sheet 100, a pole hole 101 is provided on the top cover sheet 100, and a composite pole structure 200 is provided in the pole hole 101.

Next, the composite pole structure 200 is described in detail in conjunction with Figures 2 to 5, wherein Figure 2 is a schematic diagram of an embodiment of the first pole 21 provided in an embodiment of the present application, Figure 3 is a cross-sectional schematic diagram of the first pole 21 provided in an embodiment of the present application, Figure 4 is a schematic diagram of an embodiment of the second pole 22 provided in an embodiment of the present application, and Figure 5 is a cross-sectional schematic diagram of the second pole 22 provided in an embodiment of the present application. The composite pole structure 200 includes a first pole 21 and a second pole 22, wherein the first pole 21 includes a base 211 and a protrusion 212 located on the base 211 (as shown in Figures 2 and 3); a groove 221 is provided on one side of the second pole 22 close to the first pole 21 (as shown in Figures 4 and 5); wherein the protrusion 212 is connected to the groove 221 by a thread (as shown in Figure 1).

It can be understood that the embodiment of the present application improves the pull-out strength of the composite pole structure 200 by threading the first pole 21 and the second pole 22 to form a composite pole structure 200, reduces the risk of composite failure of the contact interface between the first pole 21 and the second pole 22, and avoids the problem of welding deformation. It can simplify the production process, improve production efficiency, and reduce production costs.

In some embodiments of the present application, the protrusion 212 includes an external thread 2120 located on the side, and the groove 221 includes an internal thread 2210 located on the side, and the internal thread 2210 and the external thread 2120 are meshed with each other.

It should be noted that the base 211 of the first pole 21 can be circular, square or other shapes, and the protrusion 212 of the first pole 21 is cylindrical. For example, as shown in FIG. 2 , the base 211 and the protrusion 212 of the first pole 21 are combined into a "hat" shape, that is, the surface area of the base 211 is larger than the bottom area of the protrusion 212, and the step formed between the base 211 and the protrusion 212 is used to receive the second pole 22, and the base 211 can be integrally formed with the protrusion 212. Among them, the external thread 2120 located on the side of the protrusion 212 can extend from one end of the protrusion 212 close to the base 211 to the end of the protrusion 212 away from the base 211, that is, the external thread 2120 can cover the side of the protrusion 212.

It should be noted that the second pole 22 may be cylindrical or in other shapes. For example, as shown in FIG. 4 , a groove 221 is provided at the bottom of the second pole 22. Since the groove 221 needs to be assembled with the protrusion 212 of the first pole 21, the shape of the groove 221 is the same as that of the protrusion 212. The internal thread 2210 located on the side of the groove 221 may extend from the bottom surface of the second pole 22 to the bottom of the groove 221, that is, the internal thread 2210 may cover the side of the groove 221.

It should be noted that since the internal thread 2210 on the side of the groove 221 needs to engage with the external thread 2120 on the side of the protrusion 212, the specifications of the internal thread 2210 need to be consistent with the specifications of the external thread 2120, for example, the nominal diameter, tooth profile, pitch, etc. of the internal thread 2210 should be consistent with those of the external thread 2120.

It can be understood that when the first pole 21 and the second pole 22 are assembled with each other, it is only necessary to screw the protrusion 212 of the first pole 21 into the groove 221 at the bottom of the second pole 22, wherein the top of the protrusion 212 is in close contact with the bottom end of the groove 221, and the bottom of the second pole 22 is in close contact with the base 211 of the first pole 21. The composite pole structure 200 formed after assembly is in a "hat" shape as a whole. The composite pole structure 200 provided in the embodiment of the present application is used for assembly, which can simplify the production process, improve production efficiency, and reduce production costs.

In some embodiments of the present application, the tooth profile of the external thread 2120 is any one of a triangular thread, a trapezoidal thread, a rectangular thread, and a serrated thread.

It should be noted that the thread in the embodiment of the present application refers to a continuous raised portion with a specific cross-section and a spiral shape made on the surface of a cylinder. Threads are divided into triangular threads, trapezoidal threads, rectangular threads, sawtooth threads and other special-shaped threads according to their cross-sectional shape (i.e., tooth profile). Specifically, if the cross section of the thread is triangular, it is a triangular thread; if the cross section is trapezoidal, it is a trapezoidal thread; if the cross section is rectangular, it is a rectangular thread; if the cross section is sawtooth, it is a sawtooth thread.

In some embodiments of the present application, the pitch of the external thread 2120 is fine. It can be understood that in the embodiments of the present application, by selecting fine pitch for both the external thread 2120 and the internal thread 2210, the helix angle is smaller, which is more conducive to self-locking of the thread and can prevent loosening, and the fine pitch thread has a small pitch, which can play a role in fine adjustment.

In some embodiments of the present application, a thread locker is provided in the meshing area between the internal thread 2210 and the external thread 2120. It should be noted that the thread locker is specifically a modified conductive thread locker, and the embodiment of the present application can prevent the first pole 21 and the second pole 22 from loosening due to vibration and impact by applying the thread locker to the thread meshing area between the first pole 21 and the second pole 22.

In some embodiments of the present application, as shown in Figure 5, in a direction perpendicular to the plane where the base 211 is located, the depth h2 of the groove 221 is greater than or equal to 0.6 times the height H of the second pole 22, and less than or equal to 0.8 times the height H of the second pole 22; in a direction parallel to the plane where the base 211 is located, the diameter d2 of the groove 221 is greater than or equal to 0.5 times the width D of the second pole 22, and less than or equal to 0.8 times the width D of the second pole 22.

It can be understood that in the embodiment of the present application, by setting the depth h2 of the groove 221 at the bottom of the second pole 22 to 0.6H≤h2≤0.8H and the diameter d2 of the groove 221 to 0.5D≤d2≤0.8D, the groove 221 within this size range can better nest with the protrusion 212 of the first pole 21 and maintain its own strength and rigidity.

In some embodiments of the present application, as shown in Figure 3, in a direction perpendicular to the plane where the base 211 is located, the height h1 of the protrusion 212 is greater than or equal to 0.6 times the height H of the second pole 22, and less than or equal to 0.8 times the height H of the second pole 22; in a direction parallel to the plane where the base 211 is located, the diameter d1 of the protrusion 212 is greater than or equal to 0.5 times the width D of the second pole 22, and less than or equal to 0.8 times the width D of the second pole 22.

It is understandable that, since the protrusion 212 is to be assembled with the groove 221, the height h1 range and the diameter d1 range of the protrusion 212 correspond to the depth h2 range and the diameter d2 range of the groove 221. Specifically, the diameter d1 of the protrusion 212 must meet the condition of mutual engagement with the groove 221; and the height h1 of the protrusion 212 can be greater than the depth h2 of the groove 221, or smaller than the depth h2 of the groove 221, or equal to the depth h2 of the groove 221, as long as there is an engagement area between the protrusion 212 and the groove 221.

In some embodiments of the present application, the first pole 21 is a copper column, and the second pole 22 is an aluminum column. It should be noted that the present application is not limited thereto, and the embodiments of the present application can also be applied to other composite material structures, that is, the first pole 21 and the second pole 22 are composite structures using different materials.

Continuing to refer to Figure 1, in some embodiments of the present application, the battery cell top cover structure also includes a terminal block 300, a lower plastic 400 and a sealing ring 500; the terminal block 300 is located on the top cover sheet 100; the lower plastic 400 is located between the terminal block 300 and the top cover sheet 100; the sealing ring 500 is located in the gap between the top cover sheet 100 and the composite pole structure 200.

Claims (10)

A composite pole structure, comprising: A first pole, comprising a base and a protrusion located on the base; A second pole, wherein a groove is provided on a side of the second pole close to the first pole; Wherein, the protrusion is connected to the groove via threads. The composite pole structure according to claim 1, wherein the protrusion includes an external thread located on the side, the groove includes an internal thread located on the side, and the internal thread and the external thread are meshed with each other. The composite pole structure according to claim 2, wherein the tooth profile of the external thread is any one of a triangular thread, a trapezoidal thread, a rectangular thread, and a serrated thread. The composite pole structure according to claim 2, wherein the pitch of the external thread is fine. The composite pole structure according to claim 2, wherein a thread locking adhesive is provided in the meshing area between the internal thread and the external thread. The composite pole structure according to any one of claims 1 to 5, wherein, in a direction perpendicular to the plane where the base is located, the depth of the groove is greater than or equal to 0.6 times the height of the second pole, and less than or equal to 0.8 times the height of the second pole; In a direction parallel to the plane where the base is located, a diameter of the groove is greater than or equal to 0.5 times the width of the second pole and less than or equal to 0.8 times the width of the second pole. The composite pole structure according to any one of claims 1 to 5, wherein, in a direction perpendicular to the plane where the base is located, the height of the protrusion is greater than or equal to 0.6 times the height of the second pole, and less than or equal to 0.8 times the height of the second pole; In a direction parallel to the plane where the base is located, a diameter of the protrusion is greater than or equal to 0.5 times the width of the second pole and less than or equal to 0.8 times the width of the second pole. The composite pole structure according to any one of claims 1 to 5, wherein the first pole is a copper column and the second pole is an aluminum column. A battery cell top cover structure comprises a top cover sheet, wherein the top cover sheet is provided with a pole hole, and the composite pole structure according to any one of claims 1 to 8 is arranged in the pole hole. The battery cell top cover structure according to claim 9, wherein the battery cell top cover structure further comprises: A terminal pressing block, located on the top cover sheet; A lower plastic, located between the terminal pressing block and the top cover sheet; A sealing ring is located in the gap between the top cover sheet and the composite pole structure.