Busbar and battery

Abstract

A busbar and a battery. The busbar comprises: a busbar body (10); a conductive portion (20) connected to the busbar body (10), the conductive portion (20) comprising a first surface (20a) and a second surface (20b) facing away from the first surface (20a); and an insulating layer (30), wherein the insulating layer (30) covers at least part of the first surface (20a) and at least part of the second surface (20b).

Description

Busbar and battery

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on December 18, 2023, with application number 202323459561.1. The entire contents of the above application are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a busbar and a battery. Background Art

[0003] Power batteries have become an important part of the field of new energy technology. The packaging form and manufacturing technology of power batteries are important measures to achieve efficient battery production and performance improvement. The busbar and the battery tabs are fixedly connected by welding and the conductive handle is led out to connect with the cap. SUMMARY OF THE INVENTION

[0004] When the battery module is short-circuited, the busbar will melt and its conductive handle will easily reconnect, causing battery failure and corresponding safety problems.

[0005] The present application provides a busbar, comprising: a busbar main body;

[0006] A conductive portion connected to the busbar body; the conductive portion includes a first surface and a second surface opposite to the first surface; and

[0007] An insulating layer; wherein the insulating layer covers at least a portion of the first surface and at least a portion of the second surface.

[0008] The present application also provides a battery, comprising:

[0009] current interrupting devices;

[0010] battery cells;

[0011] The busbar is connected to the current interrupter and the battery cell respectively. Beneficial effects

[0012] The busbar provided by this application has at least the following advantages: the busbar includes a busbar body; a conductive portion connected to the busbar body; the conductive portion includes a first surface and a second surface opposite the first surface; and an insulating layer; wherein the insulating layer covers at least a portion of the first surface and at least a portion of the second surface. When a battery module short-circuits, the conductive portion is prone to breakage. The insulating layer is used to prevent the broken portion from re-contacting, ensuring a single current path, thereby resolving the problem of reconnection after the positive busbar fuses. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] FIG1 is a schematic structural diagram of a busbar provided in a preferred embodiment of the present application.

[0014] FIG2 is a schematic side view of the structure of a busbar provided in a preferred embodiment of the present application.

[0015] FIG3 is a partial side view of a busbar provided in a preferred embodiment of the present application.

[0016] 4A and 4B are another schematic structural diagram of a busbar provided in an embodiment of the present application.

[0017] FIG5 is a schematic diagram of an insulating layer of a busbar provided in an embodiment of the present application.

[0018] Figure numerals: 10 - busbar body; 11 - central pressure relief hole; 20 - conductive part; 20a - first surface; 20b - second surface; 201 - first conductive area; 202 - second conductive area; 21 - bending part; 30 - insulating layer; 301 - first sub-insulating layer; 302 - second sub-insulating layer. Modes for Carrying Out the Invention

[0019] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "upper" and "lower" is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of this application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0020] The present application may repeat reference numerals and / or reference letters in different embodiments. This repetition is for the purpose of simplicity and clarity and does not in itself indicate a relationship between the various embodiments and / or settings discussed.

[0021] The busbar and battery provided in the present application will be described in detail below in conjunction with specific embodiments and drawings, wherein the busbar of the present application can be used as a positive busbar.

[0022] Referring to FIG1 , the present application provides a busbar, comprising:

[0023] The busbar body 10;

[0024] The conductive portion 20 is connected to the busbar body 10; the conductive portion 20 includes a first surface 20a and a second surface 20b opposite to the first surface 20a; and

[0025] The insulating layer 30 covers at least a portion of the first surface 20a and the second surface 20b.

[0026] Please refer to Figure 2. For example, the busbar body 10 is provided with a central pressure relief hole 11 along the thickness direction. 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 and is subject to actual application.

[0027] Specifically, other pressure relief holes may be provided on the edge of the busbar main body 10 along the thickness direction for pressure relief or liquid injection, for example. The specific application shall prevail and no specific limitation is made in this application.

[0028] Specifically, the insulating layer 30 can, for example, cover at least a portion of the first surface 20a and at least a portion of the second surface 20b. The covered portion has an insulating effect. The insulating layer 30 is used to prevent the conductive portion 20 of the busbar from melting and then reconnecting after a battery short circuit, thereby preventing battery failure. That is, after a battery short circuit, the conductive portion 20 breaks, and the insulating layer 30 is used to prevent the broken portion of the conductive portion 20 from reconnecting. Furthermore, the conductive portion 20 is bendable, and the portion not covered by the insulating layer 30 is bent and welded to the cap.

[0029] Please refer to FIG. 3 . In an optional embodiment of the present application, the insulating layer 30 covers at least a portion of the first surface 20 a and the second surface 20 b .

[0030] Specifically, the insulating layer 30 can, for example, cover at least a portion of the upper and lower surfaces of the conductive portion 20. That is, the insulating layer 30 can, for example, cover at least a portion of the first surface 20a and the second surface 20b of the conductive portion 20. The covered portion is the insulating portion. After a battery short circuit, the broken portion of the conductive portion 20 is prone to reconnection. The insulating layer 30 is provided on the conductive portion 20 to prevent the conductive portion 20 of the busbar from reconnecting after melting after a battery short circuit, thereby providing a fuse protection function, thereby avoiding battery failure and improving battery safety. Furthermore, the conductive portion 20 is a bendable structure, and the portion not covered by the insulating layer 30 is bent and welded to the cap.

[0031] Please refer to Figures 4A-4B. In an optional embodiment of the present application, the conductive portion 20 includes a first conductive area 201 and a second conductive area 202 connected to the first conductive area 201. The first conductive area 201 is located between the busbar body 10 and the second conductive area 202, wherein the insulating layer 30 covers the first surface 20a and the second surface 20b located in the first conductive area 201.

[0032] Specifically, the first conductive area 201 and the second conductive area 202 are integrally formed and connected. The first surface 20a and the second surface 20b of the first conductive area 201 are covered with an insulating layer 30 to prevent the conductive part 20 from melting and reconnecting after a short circuit. The second conductive area 202 is used for welding to the cap.

[0033] In an optional embodiment of the present application, bending portions 21 are provided on opposite sides of the conductive portion 20 along the first direction Y, at least part of the bending portion 21 is located in the first conductive area 201, and the insulating layer 30 covers part of the bending portion 21, wherein the first direction Y is the thickness direction of the conductive portion 20, preventing the upper and lower parts of the conductive portion 20 from contacting each other after bending, so that the current channel is unique.

[0034] Specifically, the bent portion 21 is located within the first conductive region 201 and the second conductive region 202, with a portion located within the first conductive region 201 and the other portion located within the second conductive region 202. The bent portion 21 facilitates bending of the busbar and ensures a unique fuse location in the event of a battery short circuit. The bent portion 21 can, for example, be semicircular and located at the edge of the conductive portion 20, but the bent portion is not limited to this shape. The conductive portion 20 serves to ensure the bending position and provide fuse protection.

[0035] It can be understood that the portion of the bent portion 21 located in the first conductive region 201 is covered by the insulating layer 30 .

[0036] Exemplarily, the bending portion 21 can also be circular, elliptical, rectangular or other geometric shapes and arranged in a vertical direction between the first conductive area 201 and the second conductive area 202, so that the conductive portion 20 is easy to bend and the fuse position is unique, and the insulating layer 30 plays a fuse protection role.

[0037] In an optional embodiment of the present application, bending portions 21 are provided on opposite sides of the conductive portion 20 along the first direction Y, the bending portions 21 are located in the first conductive area 201, and the insulating layer 30 covers the bending portions 21, wherein the first direction Y is the thickness direction of the conductive portion 20, preventing the upper and lower parts of the conductive portion 20 from contacting each other after bending and the broken parts from being reconnected after the conductive portion 20 is broken, so that the current channel is unique, thereby playing a power-off protection role.

[0038] Specifically, the bending portion 21 is entirely located within the first conductive area 201 and 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 prone to melting, and the bending portion 21 ensures the uniqueness of the melting position. The insulating layer 30 covers the bending portion 21 to prevent the bending portion 21 from being reconnected after melting. The bending portion 21 can be, for example, semicircular, rectangular or triangular, but is not limited to this shape, so that the conductive portion 20 is easy to bend and ensures the uniqueness of the melting position, and the insulating layer 30 plays a role in melting protection.

[0039] Exemplarily, the bending portion 21 can also be circular, elliptical, rectangular or other geometric shapes and arranged in a vertical direction in the middle of the first conductive area 201, so that the conductive portion 20 is easy to bend and the fuse position is unique. The insulating layer 30 is provided on the conductive portion 20 to play a fuse protection role.

[0040] Exemplarily, the length of the bending portion 21 from the busbar body 10 can be, for example, 10 mm, and the length of the insulating layer 30 can be, for example, 11 mm, but is not limited thereto, so that the insulating layer 30 can cover the bending portion 21. When a battery short circuit occurs, the bending portion 21 ensures the uniqueness of the fuse position, and the insulating layer 30 plays a fuse protection role.

[0041] Please refer to Figure 5. In an optional embodiment of the present application, 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 the second sub-insulating layer 302 overlap on the first conductive area 201, and another portion of the first sub-insulating layer 301 and the second sub-insulating layer 302 is located on the conductive part 20.

[0042] Specifically, the area of ​​the first sub-insulating layer 301 is smaller than the area 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 area 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 from the second direction Z1 and covers part of the conductive part 20, and the first sub-insulating layer 301 extends from the third direction Z2 and covers part of the conductive part 20. The first sub-insulating layer 301 and the second sub-insulating layer 302 partially overlap on the center line of the conductive part 20 perpendicular to the second direction Z1 and the third direction Z2, and have an overlapping width, thereby ensuring that the first sub-insulating layer 301 and the second sub-insulating layer 302 can be firmly connected to avoid the first sub-insulating layer 301 and the second sub-insulating layer 302 falling off from each other.

[0043] Illustratively, 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.

[0044] Illustratively, the first sub-insulating layer 301 entirely covers the first surface 20 a and the second surface 20 b of the first conductive region 201 , and the overlapping portion of the second sub-insulating layer 302 covers the first sub-insulating layer 301 .

[0045] Alternatively, the entire second sub-insulating layer 302 covers the first surface 20a and the second surface 20b of 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 can be the same or different, and their positions can be interchanged to ensure that the first sub-insulating layer 301 and the second sub-insulating layer 302 are firmly connected and provide insulation protection.

[0046] In an optional embodiment of the present application, the overlapping width is greater than or equal to 1.5 mm, but is not limited thereto.

[0047] In an optional embodiment of the present application, the thickness of the insulating layer 30 is greater than or equal to 35 um, but is not limited thereto.

[0048] In an optional embodiment of the present application, the insulating layer 30 is an insulating material, such as ceramic or polyimide, but not limited thereto. A composite material with good insulating properties such as polyethylene terephthalate (PET) may also be used to provide power-off protection.

[0049] In a second aspect, in another optional embodiment of the present application, a battery is provided, comprising:

[0050] current interrupting devices;

[0051] battery cells;

[0052] The above-mentioned busbar is connected to the current interruption device and the battery cell respectively.

[0053] The current interrupter is a device that effectively protects the battery by disconnecting the battery cell from the external circuit when an abnormality occurs. When the battery encounters an internal crisis, such as overheating, short circuiting, or overcharging, the current interrupter monitors pressure changes and automatically disconnects the battery cell from the external circuit when the pressure exceeds a preset threshold, preventing further damage.

[0054] Specifically, the busbar can serve as a positive busbar, for example. A battery cell includes essential components such as the positive and negative tabs, positive and negative electrode sheets, a separator, and electrolyte. The busbar is welded to the tabs, and the conductive portion 20 of the busbar, distal from the busbar body 10, is connected to a current interrupter.

[0055] The busbar provided by the present application includes at least the following working processes or principles: the busbar includes: a busbar body; a conductive part connected to the busbar body; the conductive part includes a first surface and a second surface opposite to the first surface; and an insulating layer; wherein the insulating layer covers at least a portion of the first surface and the second surface. When the battery module is short-circuited, the insulating layer is used to isolate the first surface from the second surface. When the battery is short-circuited, the conductive part is prone to breakage. A bending part is provided to ensure that the break position is unique, so that the current channel is unique, and an insulating layer is provided on the conductive part. The insulating layer is used to isolate the broken part of the conductive part from re-contact, so as to solve the problem of reconnection after the positive busbar is melted, and play a role in protecting the battery.

Claims

1. A busbar, comprising: A manifold body (10); A conductive portion (20) connected to the busbar body (10); the conductive portion (20) comprises a first surface (20a) and a second surface (20b) opposite to the first surface (20a); and An insulating layer (30); wherein 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 busbar according to claim 1, wherein: The conductive portion (20) comprises a first conductive area (201) and a second conductive area (202) connected to the first conductive area (201), the first conductive area (201) being located between the busbar body (10) and the second conductive area (202), wherein the insulating layer (30) covers the first surface (20a) and the second surface (20b) located in the first conductive area (201).

3. The busbar according to claim 2, wherein: Bending portions (21) are provided on opposite sides of the conductive portion (20) along a first direction, at least a portion of the bending portion (21) is located in the first conductive area (201), and the insulating layer (30) covers a portion of the bending portion (21), wherein the first direction is a thickness direction of the conductive portion (20).

4. The busbar according to claim 2, wherein: Bending portions (21) are provided on opposite sides of the conductive portion (20) along a first direction, the bending portions (21) are located in the first conductive area (201), and the insulating layer (30) covers the bending portions (21), wherein the first direction is a thickness direction of the conductive portion (20).

5. The busbar according to claim 2, wherein: The insulating layer (30) comprises a first sub-insulating layer (301) and a second sub-insulating layer (302), wherein a portion of the first sub-insulating layer (301) and the second sub-insulating layer (302) overlap on the first conductive area (201), and another portion of the first sub-insulating layer (301) and the second sub-insulating layer (302) are located on the conductive portion (20).

6. The busbar according to claim 1, wherein: The busbar body (10) is provided with a central pressure relief hole (11) along the thickness direction.

7. The busbar according to claim 5, wherein: The overlapping width is greater than or equal to 1.5 mm.

8. The busbar according to any one of claims 1 to 5, wherein: The thickness of the insulating layer (30) is greater than or equal to 35 um.

9. The busbar according to any one of claims 1 to 5, wherein: The material of the insulating layer (30) is ceramic or polyimide.

10. A battery comprising: Current interrupting devices; Battery cells; The busbar according to any one of claims 1 to 9, wherein the busbar is connected to the current interruption device and the battery cell respectively.

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