Current collector plate and battery
The current collector plate with an insulating layer on its conductive surfaces addresses the issue of reconnection during battery short-circuits, ensuring the battery's safety and preventing failure.
Patent Information
- Application Number
- JP2025001152U
- Authority / Receiving Office
- JP · JP
- Patent Type
- Utility models
- Current Assignee / Owner
- Priority Date
- 2024-07-31
- Filing Date
- 2025-04-14
- Publication Date
- 2025-06-11
- Estimated Expiration
- 2034-12-18
AI Technical Summary
When a battery module is short-circuited, the current collector plate's conductive shank is easily reconnected, leading to battery failure and safety issues.
A current collector plate design featuring a conductive part with an insulating layer covering at least parts of its surfaces, preventing reconnection after the plate is broken during a short circuit.
The insulating layer ensures that the broken conductive part does not reestablish contact, maintaining a unique current path and preventing battery failure, thereby enhancing safety.
Smart Images
Figure 0003251613000001_ABST
Abstract
Description
Technical Field
[0001] This disclosure claims the priority of a Chinese patent application filed with the Chinese Patent Office on December 18, 2023, with the application number 202323459561.1. The entire content of the above application is incorporated herein by reference.
[0002] This disclosure relates to the field of battery technology, specifically to a current collector plate and a battery.
Background Art
[0003] Batteries are an important component in the field of new energy technology. The packaging form and manufacturing technology of batteries are important means to achieve high-efficiency production and performance improvement of batteries. The current collector plate and the battery tab are fixedly connected by welding, and a conductive shank is drawn out and connected to the cap.
Summary of the Invention
Problems to be Solved by the Invention
[0004] When the battery module is short-circuited, after the current collector plate is blown, its conductive shank is easily reconnected, causing battery failure and associated safety problems.
Means for Solving the Problems
[0005] This disclosure provides a current collector plate. The current collector plate includes a current collector plate body, a conductive part, and an insulating layer. The conductive part is connected to the current collector plate body. The conductive part includes a first surface and a second surface opposite to the first surface. The insulating layer covers at least a part of the first surface and at least a part of the second surface.
[0006] This disclosure provides a current. The battery includes a current interruption device, a battery cell, and a current collector plate, and the current collector plate is connected to the current interruption device and the battery cell respectively.
Advantages of the Invention
[0007] The current collector plate provided by the present disclosure includes at least the following beneficial effects. The current collector plate includes a current collector plate body, a conductive part, and an insulating layer. The conductive part is connected to the current collector plate body. The conductive part includes a first surface and a second surface opposite to the first surface. The insulating layer covers at least a part of the first surface and at least a part of the second surface. When the battery module is short-circuited, the conductive part is easily broken. The insulating layer prevents the broken part of the conductive part from contacting again and is used to maintain the uniqueness of the current path, thereby solving the problem of reconnection after the positive current collector plate is blown.
Brief Description of the Drawings
[0008]
Figure 1
Figure 2
Figure 3
Figure 4A
Figure 4B
Figure 5
Modes for Carrying Out the Invention
[0009] In the description of the present disclosure, the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of facilitating and simplifying the description of the present disclosure, and does not mean that the indicated device or element must have a specific orientation and be configured and operated in a specific orientation. Also, the terms "first" and "second" are only for the purpose of description, and do not indicate relative importance or imply the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more of the above features. In the description of the present disclosure, unless otherwise specifically limited, the meaning of "a plurality" is two or more.
[0010] The present disclosure can refer to numbers and / or characters repeatedly in different embodiments. This repetition is for the purpose of simplification and clarification, and does not itself indicate the relationship between the various embodiments and / or settings being discussed.
[0011] Hereinafter, the current collector plate and the battery provided by the present disclosure will be described in detail in combination with specific embodiments and drawings. Here, the current collector plate of the present disclosure may be used as a positive current collector plate.
[0012] Referring to FIG. 1, the present disclosure provides a current collector plate. The current collector plate includes a current collector plate body 10, a conductive part 20, and an insulating layer 30. The conductive part 20 is connected to the current collector plate body 10. The conductive part 20 includes a first surface 20a and a second surface 20b opposite to the first surface 20a. The insulating layer 30 covers at least a part of the first surface 20a and at least a part of the second surface 20b.
[0013] Referring to FIG. 2, as an example, in the current collector plate body 10, for example, a central pressure relief hole 11 is provided along the thickness direction of the current collector plate body 10. The central pressure relief hole 11 realizes the functions of pressure relief and electrolyte injection. The number of the central pressure relief holes 11 is not limited. Specifically, it is determined according to the actual application.
[0014] Specifically, in order to be used for pressure relief or liquid injection, the current collector body 10 may, for example, have other pressure relief holes provided at the edge of the current collector body 10 along the thickness direction. Specifically, it is determined according to actual applications and no specific limitations are provided in this disclosure.
[0015] Specifically, the insulating layer 30 can cover, for example, at least a part of the first surface 20a and at least a part of the second surface 20b. The covered part has an insulating effect. The insulating layer 30 is used to prevent the conductive part 20 of the current collector from fusing and reconnecting after the battery is short-circuited, thereby avoiding battery failure. That is, after the battery is short-circuited, the conductive part 20 breaks, and the insulating layer 30 is used to prevent the reconnection of the broken part of the conductive part 20. And the conductive part 20 is bendable, and the part not covered by the insulating layer 30 is bent and welded to the cap.
[0016] Referring to FIG. 3, in an embodiment of the present disclosure, the insulating layer 30 covers at least a part of the first surface 20a and at least a part of the second surface 20b.
[0017] Specifically, the insulating layer 30 can cover, for example, the upper and lower surfaces of at least a part of the conductive part 20. That is, the insulating layer 30 can cover, for example, the first surface 20a and the second surface 20b of at least a part of the conductive part 20. The covered part is an insulating part. After the battery is short-circuited, the broken part of the conductive part 20 is easy to reconnect. The insulating layer 30 is provided on the conductive part 20 and is used to prevent the conductive part 20 of the current collector from fusing and reconnecting after the battery is short-circuited, playing a role in fuse protection, thereby avoiding battery failure and improving the safety performance of the battery. And the conductive part 20 has a bendable structure, and the part not covered by the insulating layer 30 is bent and welded to the cap.
[0018] Referring to FIGS. 4A to 4B, in one embodiment of the present disclosure, the conductive part 20 includes a first conductive region 201 and a second conductive region 202 connected to the first conductive region 201. The first conductive region 201 is located between the electric collector body 10 and the second conductive region 202, and the insulating layer 30 covers the first surface 20a and the second surface 20b located on the first conductive region 201.
[0019] Specifically, the first conductive region 201 and the second conductive region 202 are integrally formed and connected. The first surface 20a and the second surface 20b on the first conductive region 201 cover the insulating layer 30 and are used to prevent the conductive part 20 from fusing and reconnecting after the battery is short-circuited. The second conductive region 202 is used for welding with the cap.
[0020] In one embodiment of the present disclosure, bending portions 21 are provided on both opposite sides of the conductive part 20 along the first direction Y. At least a part of the bending portions 21 is located within the first conductive region 201, and the insulating layer 30 covers a part of the bending portions 21. Here, the first direction Y is the thickness direction of the conductive part 20, which prevents contact between the upper and lower portions after the conductive part 20 is bent and makes the current path single.
[0021] Specifically, this bending portion 21 is located within the first conductive region 201 and the second conductive region 202, that is, a part of this bending portion 21 is located within the first conductive region 201, and the other part of this bending portion 21 is located within the second conductive region 202. This bending portion 21 facilitates the bending of the current collector plate and ensures the singularity of the fusing position during battery short-circuit. This bending portion 21 may be, for example, semicircular and located at the edge of the conductive part 20, but the bending portion is not limited to this shape, and this conductive part 20 serves to ensure the bending position and provide fusing protection.
[0022] It can be understood that the portion of the bending portion 21 located within the first conductive region 201 is covered by the insulating layer 30.
[0023] Exemplarily, this bent portion 21 may further be, for example, circular, elliptical, rectangular, or other geometric shapes, and by arranging it vertically in the middle of the first conductive region 201 and the second conductive region 202, the conductive portion 20 is easy to bend, the singularity of the fusing position is ensured, and the insulating layer 30 plays a role in fusing protection.
[0024] In one embodiment of the present disclosure, bent portions 21 are provided along the first direction Y on both opposite sides of the conductive portion 20. The bent portions 21 are located within the first conductive region 201, and the insulating layer 30 covers the bent portions 21. Here, the first direction Y is the thickness direction of the conductive portion 20, which prevents contact between the upper and lower portions after the conductive portion 20 is bent and reconnection of the fractured portion after the conductive portion 20 is fractured, makes the current path single, and plays a role in power-off protection.
[0025] Specifically, the bent portion 21 is entirely located within the first conductive region 201 and is located at the edge of the conductive portion 20 and is covered by the insulating layer 30. When the battery is short-circuited, the conductive portion 20 is easy to fuse, the bent portion 21 ensures the singularity of the fusing position, the insulating layer 30 covers the bent portion 21, and is used to prevent reconnection after fusing at the bent portion 21. This bent portion 21 may be, for example, semi-circular, rectangular, or triangular, and is not limited to these shapes, thereby making the conductive portion 20 easy to bend, ensuring the singularity of the fusing position, and enabling the insulating layer 30 to play a role in fusing protection.
[0026] Exemplarily, this bent portion 21 may further be, for example, circular, elliptical, rectangular, or other geometric shapes, and by arranging it vertically in the middle of the first conductive region 201, the conductive portion 20 is easy to bend, the singularity of the fusing position is ensured, and the insulating layer 30 is provided on the conductive portion 20 to play a role in fusing protection.
[0027] Exemplarily, the length from the bent portion 21 to the current collecting plate body 10 may be, for example, 10 mm, and the length of the insulating layer 30 may be, for example, 11 mm, but is not limited thereto. Thereby, the insulating layer 30 can cover the bent portion 21. When a short circuit of the battery occurs, the bent portion 21 ensures the singularity of the fusing position, and the insulating layer 30 plays a role of fusing protection.
[0028] Referring to FIG. 5, in an embodiment of the present disclosure, the insulating layer 30 includes a first sub-insulating layer 301 and a second sub-insulating layer 302. A part of the first sub-insulating layer 301 and a part of the second sub-insulating layer 302 overlap in the first conductive region 201, and another part of the first sub-insulating layer 301 and another part of the second sub-insulating layer 302 are located in the conductive portion 20.
[0029] Specifically, the area of the first sub-insulating layer 301 is smaller than the areas of the first surface 20a and the second surface 20b located in the first conductive region 201, and the area of the second sub-insulating layer 302 is also smaller than the areas of the first surface 20a and the second surface 20b located in the first conductive region 201. That is, the first sub-insulating layer 301 extends in the second direction Z1 and covers a part of the conductive portion 20, and the first sub-insulating layer 301 extends in the third direction Z2 and covers a part of the conductive portion 20. The first sub-insulating layer 301 and the second sub-insulating layer 302 partially overlap at the center line of the conductive portion 20 perpendicular to the second direction Z1 and the third direction Z2 and have an overlapping width, ensuring that the first sub-insulating layer 301 and the second sub-insulating layer 302 are firmly connected and avoiding mutual detachment between the first sub-insulating layer 301 and the second sub-insulating layer 302.
[0030] Exemplarily, the portion of the first sub-insulating layer 301 that does not overlap with the second sub-insulating layer 302 covers the first surface 20a and the second surface 20b located in the first conductive region 201, and the portion of the second sub-insulating layer 302 that does not overlap with the first sub-insulating layer 301 covers the first surface 20a and the second surface 20b located in the first conductive region 201.
[0031] Exemplarily, the first sub-insulating layer 301 covers the entire first surface 20a and the second surface 20b located in the first conductive region 201, and the overlapping portion of the second sub-insulating layer 302 covers the first sub-insulating layer 301.
[0032] Alternatively, the second sub-insulating layer 302 covers the entire first surface 20a and the second surface 20b located in the first conductive region 201, and the overlapping portion of the first sub-insulating layer 301 covers the second sub-insulating layer 302. The materials of the first sub-insulating layer 301 and the second sub-insulating layer 302 may be the same or different, and their positions may be mutually replaced, thereby ensuring that the first sub-insulating layer 301 and the second sub-insulating layer 302 are firmly connected, and the first sub-insulating layer 301 and the second sub-insulating layer 302 play an insulating protection role.
[0033] In one embodiment of the present disclosure, in the first conductive region 201, the overlapping width of a part of the first sub-insulating layer 301 and a part of the second sub-insulating layer 302 is 1.5 mm or more, but is not limited thereto.
[0034] In one embodiment of the present disclosure, the thickness of the insulating layer 30 is 35 μm or more, but is not limited thereto.
[0035] In one embodiment of the present disclosure, the insulating layer 30 is an insulating material, for example, it may be ceramic or polyimide, but is not limited thereto, and a composite material with good insulating performance such as polyethylene terephthalate (PET) may also be adopted, thereby playing a role in power-off protection.
[0036] In the second aspect, another alternative embodiment of the present disclosure provides a battery. The battery includes a current interruption device, a battery cell, and the current collector plate, and the current collector plate is connected to the current interruption device and the battery cell respectively.
[0037] Here, a current cut-off device is a device that immediately cuts off the electrical connection between a battery cell and an external circuit when an abnormality occurs in the battery, thereby providing an effective protection function for the battery. When a crisis such as overheating, short circuit, or overcharging occurs inside the battery, the current cut-off device monitors the pressure change and automatically cuts off the connection between the battery cell and the external circuit when the pressure exceeds a predetermined threshold value to prevent further damage.
[0038] Specifically, the current collector plate may be used as a positive current collector plate, for example. The battery cell includes components necessary to form the battery cell, such as a positive tab, a negative tab, a positive sheet, a negative sheet, a separator, and an electrolyte. The current collector plate is welded to the tab of the battery cell, and one end of the conductive portion 20 of the current collector plate that is away from the current collector plate body 10 is connected to the current cut-off device.
[0039] The current collector plate provided by the present disclosure includes at least the following processes or principles. The current collector plate includes a current collector plate body, a conductive portion, and an insulating layer. The conductive portion is connected to the current collector plate body. The conductive portion includes a first surface and a second surface opposite to the first surface. The insulating layer covers at least a part of the first surface and at least a part of the second surface. When the battery module is short-circuited, the insulating layer is used to prevent contact between the first surface and the second surface. When the battery is short-circuited, the conductive portion is easily broken. By installing a bending portion, the breaking position is kept single, making the current path single. Also, an insulating layer is installed on the conductive portion, and the insulating layer prevents the broken part of the conductive portion from contacting again, thereby solving the problem of reconnection after the positive current collector plate is melted and playing a role in protecting the battery.
Description of the reference numerals
[0040] 10: Current collector plate body, 11: Central pressure relief hole, 20: Conductive portion, 20a: First surface, 20b: Second surface, 201: First conductive region, 202: Second conductive region, 21: Bending portion, 30: Insulating layer, 301: First sub-insulating layer, 302: Second sub-insulating layer
Claims
1. A current collecting plate, The current collector includes a current collector body (10), a conductive portion (20), and an insulating layer (30), The conductive portion (20) is connected to the current collector body (10), and the conductive portion (20) includes a first surface (20a) and a second surface (20b) opposite to the first surface (20a), The current collector plate is characterized in that the insulating layer (30) covers at least a portion of the first surface (20a) and at least a portion of the second surface (20b).
2. The conductive portion (20) includes a first conductive region (201) and a second conductive region (202) connected to the first conductive region (201), the first conductive region (201) is located between the collector body (10) and the second conductive region (202), and the insulating layer (30) covers the first surface (20a) and the second surface (20b) located in the first conductive region (201).
3. The current collector plate according to claim 2, characterized in that a folded portion (21) is provided along a first direction on both opposing sides of the conductive portion (20), at least a portion of the folded portion (21) is located within the first conductive region (201), the insulating layer (30) covers a portion of the folded portion (21), and the first direction is a thickness direction of the conductive portion (20).
4. The current collector plate according to claim 2, characterized in that a folded portion (21) is provided along a first direction on both opposing sides of the conductive portion (20), the folded portion (21) is located within the first conductive region (201), the insulating layer (30) covers the folded portion (21), and the first direction is a thickness direction of the conductive portion (20).
5. The current collector plate according to claim 2, characterized in that the insulating layer (30) includes a first sub-insulating layer (301) and a second sub-insulating layer (302), a portion of the first sub-insulating layer (301) and a portion of the second sub-insulating layer (302) overlap in the first conductive region (201), and another portion of the first sub-insulating layer (301) and another portion of the second sub-insulating layer (302) are located in the conductive portion (20).
6. The current collector plate according to claim 1, wherein the current collector plate body (10) is provided with a central pressure relief hole (11) along the thickness direction of the current collector plate body (10).
7. The current collector according to claim 5, characterized in that the width of an overlap between a portion of the first sub-insulating layer (301) and a portion of the second sub-insulating layer (302) in the first conductive region (201) is 1.5 mm or more.
8. 6. The current collector plate according to claim 1, wherein the insulating layer (30) has a thickness of 35 μm or more.
9. 6. The current collector according to claim 1, wherein the material of the insulating layer (30) is ceramic or polyimide.
10. A battery, A current interruption device; A battery cell; The current collector plate according to any one of claims 1 to 7, A battery, characterized in that the current collecting plate is connected to the current interrupting device and the battery cell, respectively.