Battery pack

Abstract

The utility model relates to the field of batteries, and discloses a battery pack. The battery pack comprises at least two batteries, and a buffer piece is arranged between the adjacent batteries. The battery comprises a shell and a cover plate, the shell is provided with at least one opening, the cover plate covers the opening, a battery cell is arranged in the shell, the battery cell comprises a battery cell body and a tab connected with the battery cell body, and the tab is connected with a pole assembly of the cover plate; the outer surface of the shell is provided with an insulating part, the insulating part is provided with a first area and a second area, and the thickness of the insulating part corresponding to the first area is larger than that of the insulating part corresponding to the second area; in the height direction of the battery, the tabs are at least partially overlapped with the first region; the buffer part is at least partially arranged between the first areas of the adjacent batteries. According to the battery pack provided by the invention, the connection stability of the tabs is prevented from being influenced by the reverse acting force of the buffer strips while the installation stability is kept.

Description

A battery pack Technical Field

[0001] This application relates to the field of batteries, and in particular to a battery pack. Background Technology

[0002] A battery pack typically consists of multiple batteries arranged in a certain direction. Within a battery pack, the batteries are usually spaced apart to accommodate deformation during charge-discharge cycles and to prevent short circuits between adjacent batteries. The space between adjacent batteries serves as an expansion buffer. To prevent direct contact during expansion, buffer strips can be placed between adjacent batteries. However, as the battery expands and compresses the buffer strips, the strips exert a reverse force on the battery, which can affect the stability of the tab connection. Summary of the Invention

[0003] This application discloses a battery pack that maintains installation stability while preventing the tabs from being affected by the reverse force of the buffer strip, thus ensuring the stability of their connection.

[0004] To achieve the above objectives, this application provides the following technical solution:

[0005] This application provides a battery pack, which includes at least two batteries arranged along a first direction, and a buffer is provided between adjacent batteries;

[0006] The battery includes a casing and a cover plate. The casing has at least one opening, and the cover plate closes to the opening. A battery cell is disposed inside the casing. The battery cell includes a battery cell body and a tab connected to the battery cell body. The tab is connected to the terminal assembly of the cover plate.

[0007] The outer surface of the housing is provided with an insulating member, the insulating member having a first region and a second region, the thickness of the insulating member corresponding to the first region being greater than the thickness of the insulating member corresponding to the second region; in the height direction of the battery, the tab at least partially overlaps with the first region;

[0008] The buffer is at least partially disposed between the first regions adjacent to the batteries.

[0009] The beneficial effects of adopting the technical solution of this application are as follows:

[0010] An insulating component is provided on the outer surface of the battery casing to achieve insulation between batteries. This insulating component on the outer surface of the casing is divided into two regions: a first region and a second region. The thickness of the insulating component corresponding to the first region is greater than the thickness of the insulating component corresponding to the second region. A buffer component is provided between adjacent batteries within the battery pack to increase the insulation between adjacent batteries and to improve the stability of battery installation. During charging and discharging, the battery expands. When the battery expands, the buffer component exerts a reverse compression force on the casing. The buffer component is located between the first regions of adjacent batteries. The insulating component can release the reverse force of the buffer component, preventing the battery cell tabs from being affected by expansion forces and reaction forces, protecting the connection stability between the tabs and the cover plate, and preventing damage to the tabs. Attached Figure Description

[0011] Figure 1 is a schematic diagram of a battery pack provided in an embodiment of this application;

[0012] Figure 2 is a side view of the structure of adjacent batteries in one embodiment;

[0013] Figure 3 is a cross-sectional view of adjacent batteries in one embodiment.

[0014] Icon labels:

[0015] 100 - Battery pack; 10 - Battery; 20 - Buffer component; 30 - Battery cell; 31 - Battery cell body; 32 - Tab;

[0016] 11-Housing; 12-Cover plate; 121-Pole post assembly; 13-Insulating layer; 14-Insulating film. Detailed Implementation

[0017] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0018] Figure 1 is a schematic diagram of a battery pack according to one embodiment. As shown in Figure 1, the battery pack 100 includes at least two batteries 10 arranged along a first direction, i.e., the x-direction. The number of batteries 10 in the battery pack 100 can be multiple, such as 3, 4, 5, 8, 10, 13, 15, or more. No specific limitation is made here, and the design can be tailored according to the electrical performance of the battery pack.

[0019] Figure 2 is a schematic diagram of a battery structure. As shown in Figure 2, the battery 10 includes a housing 11 and a cover plate 12. The housing 11 has at least one opening, and correspondingly, the number of cover plates 12 can be at least one. The cover plate 12 closes onto the opening of the housing 11. One cover plate 12 can be closed at each opening.

[0020] Figure 3 is a cross-sectional view of adjacent batteries in one embodiment. As shown in Figure 3, the battery cell 30 of the battery 10 can be disposed within the receiving space formed by the housing 11 and the cover plate 12. Along the height direction of the battery, the battery 10 includes a top surface and a bottom surface, and the cover plate 12 is disposed on the top surface of the battery.

[0021] The battery cell 30 includes a cell body 31 and tabs 32. The cell body 31 is connected to the tabs 32. The tabs 32 are divided into a positive tab and a negative tab. Both the positive and negative tabs can be led out from the top surface of the cell body, that is, the side near the housing opening and the cover plate 12. The cover plate 12 may be provided with terminal assemblies, such as a positive terminal and a negative terminal. The positive terminal can be connected to the positive tab of the battery cell, and the negative terminal can be connected to the negative tab of the battery cell.

[0022] The outer surface of the housing 11 is provided with an insulating element. The insulating element has a first region and a second region, and the thickness of the insulating element corresponding to the first region is greater than the thickness of the insulating element corresponding to the second region.

[0023] Referring to Figures 2 and 3 together, in one embodiment, the insulating element includes an insulating layer 13 and an insulating film 14. The insulating layer 13 is disposed on the outer surface of the housing 11, and the insulating film 14 is disposed on the surface of the cover plate 12 and extends from the surface of the cover plate 12 to the outer surface of the housing 11, covering a portion of the insulating layer 13. On the outer surface of the housing 11, the overlapping area of ​​the insulating layer 13 and the insulating film 14 is a first region, and the area on the outer surface of the housing 11 excluding the area where the insulating film 14 is disposed is a second region.

[0024] The insulating layer 13 on the outer surface of the housing 11 may be an insulating coating formed by spraying or coating processes. The insulating film 14 on the surface of the cover plate 12 may be formed on the surface of the cover plate by wrapping. To improve the insulation at the joint between the cover plate 12 and the housing 11, the insulating film 14 may extend from the surface of the cover plate 12 to the outer surface of the housing 11 adjacent to the cover plate 12. The insulating layer 13 may cover the entire outer surface of the housing 11, or it may have a certain gap from the opening of the housing 11. The insulating film 14 extends to the surface of the housing 11 adjacent to the cover plate 12 and then abuts against the insulating layer 13, or it may cover part of the insulating layer 13.

[0025] The cover plate 12 and the housing 11 are sealed by welding at the joint. The sealing performance of the insulating layer 13 is prone to deterioration at this point. Therefore, an insulating film 14 is provided on the surface of the cover plate 12 and extends from the surface of the cover plate 12 to the outer surface of the housing 11. The insulating film 14 is used to increase the sealing performance between the cover plate 12 and the housing 11 and achieve the insulation effect.

[0026] In one embodiment, the thickness of the insulating film is 30-200 μm, and the thickness of the insulating layer is 30-500 μm. The thickness of the insulating layer and the insulating film should not be too thin or too thick, so that the insulating layer and the insulating film maintain high insulation performance without significantly increasing the size of the battery. Exemplarily, the thickness of the insulating film can be, for example, 30 μm, 50 μm, 80 μm, 100 μm, 120 μm, 150 μm, 180 μm, 200 μm, or any two values ​​above. The thickness of the insulating layer can, for example, be 30 μm, 50 μm, 100 μm, 120 μm, 150 μm, 180 μm, 200 μm, 220 μm, 250 μm, 280 μm, 300 μm, 350 μm, 400 μm, 450 μm, 500 μm, or any two values ​​above.

[0027] To improve the installation stability of the battery pack and increase the insulation between batteries within the pack, a buffer can be installed between adjacent batteries. As shown in Figure 3, the buffer can be installed between the first regions of adjacent batteries.

[0028] An insulating component is provided on the outer surface of the battery casing to achieve insulation between batteries. This insulating component on the outer surface of the casing is divided into two regions: a first region and a second region. The thickness of the insulating component corresponding to the first region is greater than the thickness of the insulating component corresponding to the second region. A buffer component is provided between adjacent batteries within the battery pack to increase the insulation between adjacent batteries and to improve the stability of battery installation. During charging and discharging, the battery expands. When the battery expands, the buffer component exerts a reverse compression force on the casing. The buffer component is located between the first regions of adjacent batteries. The insulating component can release the reverse force of the buffer component, preventing the battery cell tabs from being affected by expansion forces and reaction forces, protecting the connection stability between the tabs and the cover plate, and preventing damage to the tabs.

[0029] Referring again to Figures 2 and 3, in one embodiment, in the height direction of the battery, i.e., the z-direction, the cover plate 12 is disposed on the top of the battery, the tab 32 is disposed close to the cover plate 12, the lower edge of the buffer member 20 disposed in the first region is lower than the connection point between the tab 32 and the cell body 31, and the upper edge of the buffer member 20 is higher than the connection point between the tab 32 and the cell body 31.

[0030] This configuration ensures that the tabs and the buffer have a partial overlap in the height direction, thus allowing the buffer to function as an isolation buffer while preventing the reaction force of the buffer from damaging the tabs.

[0031] In another embodiment, in the height direction of the battery, the cover plate 12 is disposed at the top of the battery, and the tab 32 is disposed close to the cover plate 12. The lower edge of the buffer member 20 disposed in the first region is higher than the connection point between the tab 32 and the cell body 31, but lower than the connection point between the tab 32 and the terminal assembly 121. In the height direction of the battery, the upper edge of the buffer member 20 disposed in the first region is higher than the connection point between the tab 32 and the terminal assembly 121. This arrangement ensures that the tab 32 and the buffer member 20 have a partially overlapping area in the height direction, thereby allowing the buffer member 20 to provide isolation and cushioning while preventing the reaction force of the buffer member 20 from damaging the tab 32.

[0032] In this embodiment of the application, the buffer 20 may be entirely located within the first area, or it may be partially located within the first area.

[0033] In one embodiment, the buffer 20 includes a plurality of buffer strips, at least some of which are disposed between the first regions adjacent to the batteries and at least some of which are disposed between the second regions adjacent to the batteries.

[0034] Buffer strips can prevent adjacent batteries from squeezing each other, and can also leave a certain buffer space between adjacent buffer strips to take advantage of the deformation that occurs during the charging and discharging process of the battery.

[0035] In another embodiment, the buffer 20 includes a plurality of buffer strips. In the height direction of the battery, some of the buffer strips, located near the tab 32, are situated in the first region, and a portion of the buffer strips are located in the second region. In this configuration, the buffer strips near the tab 32 are located in the first region to protect the tab. The buffer strips located in the second region prevent the battery from making contact between the two regions.

[0036] The buffer component 20 is a one-piece frame structure. This frame structure may include multiple interconnected buffer strips. The one-piece frame structure facilitates the installation and fixation of the buffer component.

[0037] In one embodiment, the thickness of the insulating element corresponding to the first region is 60-700 μm; the thickness of the buffer element is 1-5 mm. The thickness direction of the buffer element is the first direction. The thickness of the insulating element is the total thickness of the insulating layer and the insulating film stacked together. For example, the thickness of the insulating element can be any two values ​​between 60 μm, 100 μm, 150 μm, 200 μm, 250 μm, 300 μm, 350 μm, 400 μm, 450 μm, 500 μm, 550 μm, 600 μm, 650 μm, 700 μm, or more. The thickness of the buffer element can be any two values ​​between 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, or more.

[0038] Obviously, those skilled in the art can make various modifications and variations to the embodiments of this application without departing from the spirit and scope of this application. Therefore, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application also intends to include these modifications and variations.

Claims

1. A battery pack, characterized in that, The device includes at least two batteries arranged along a first direction, with a buffer between adjacent batteries. Each battery includes a casing and a cover plate. The casing has at least one opening, and the cover plate closes to the opening. A battery cell is disposed within the casing. Each battery cell includes a cell body and a tab connected to the cell body. The tab is connected to an electrode assembly of the cover plate. An insulating member is provided on the outer surface of the casing. The insulating member has a first region and a second region, with the thickness of the insulating member corresponding to the first region being greater than the thickness of the insulating member corresponding to the second region. In the height direction of the battery, the tab at least partially overlaps with the first region. The buffer is at least partially disposed between the first regions of adjacent batteries.

2. The battery pack according to claim 1, characterized in that, The insulating component includes an insulating layer and an insulating film. The insulating layer is disposed on the outer surface of the housing, and the insulating film is disposed on the surface of the cover plate and extends from the surface of the cover plate to the outer surface of the housing, covering part of the insulating layer. The overlapping area of ​​the insulating layer and the insulating film is a first area, and the area of ​​the housing excluding the area where the insulating film is disposed is a second area.

3. The battery pack according to claim 2, characterized in that, The thickness of the insulating film is 30-200 μm, and the thickness of the insulating layer is 30-500 μm.

4. The battery pack according to claim 1, characterized in that, In the height direction of the battery, the tab is disposed close to the opening, the lower edge of the buffer member disposed in the first region is lower than the connection point between the tab and the cell body, and the upper edge of the buffer member is higher than the connection point between the tab and the cell body.

5. The battery pack according to claim 1, characterized in that, In the height direction of the battery, the tab is disposed close to the opening, and the lower edge of the buffer member disposed in the first region is higher than the connection point between the tab and the cell body, but lower than the connection point between the tab and the terminal assembly.

6. The battery pack according to claim 5, characterized in that, In the height direction of the battery, the upper edge of the buffer member located in the first region is higher than the connection point between the tab and the terminal assembly.

7. The battery pack according to any one of claims 1-6, characterized in that, All the buffer components are located within the first area.

8. The battery pack according to any one of claims 1-6, characterized in that, The buffer includes a plurality of buffer strips, at least some of which are disposed between the first regions of adjacent batteries and at least some of which are disposed between the second regions of adjacent batteries.

9. The battery pack according to any one of claims 1-6, characterized in that, The buffer includes multiple buffer strips. In the height direction of the battery, the buffer strips located near the tabs are located in the first region, and some of the buffer strips are located in the second region.

10. The battery pack according to any one of claims 1-6, characterized in that, The thickness of the insulating component corresponding to the first region is 60-700 μm; the thickness of the buffer component is 1-5 mm, wherein the thickness direction of the buffer component is the first direction.

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