A battery and an electrode therefor

Abstract

This application provides a battery and its cell. The cell includes a main body and four tab groups, all connected to the main body. The four tab groups are divided into two positive tab groups and two negative tab groups. The two positive tab groups can simultaneously connect to a first adapter plate, and the two negative tab groups can simultaneously connect to a second adapter plate. Each tab group provides the maximum current-carrying area of ​​the cell. In this cell, the four tab groups working together allow the internal stress and external forces on the cell to be more evenly distributed across each tab group, effectively preventing excessive stress concentration at any single tab group. This reduces the risk of tab group tearing and significantly improves the cell's stability and lifespan. Since each tab group provides the maximum current-carrying area required for normal charging and discharging, tearing of any one tab group will not affect the normal operation of the cell, thus improving the cell's current-carrying stability and safety.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery pack, battery, and battery cell. Background Technology

[0002] For conventional square batteries, each cell has one positive tab and one negative tab, located on the same side. During battery manufacturing, transportation, and use, various factors can cause the tabs to tear. When the tabs tear, the current-carrying area at the tabs decreases significantly, and the resistance increases dramatically. This leads to increased heat generation during charging and discharging, reduced charging and discharging efficiency, and decreased output capacity, which in turn further degrades the overall performance of the battery pack and reduces its lifespan. Utility Model Content

[0003] The purpose of this application is to provide a battery cell that can reduce the risk of electrode tearing and improve current conduction stability. Furthermore, this application also provides a battery.

[0004] A battery cell includes a main body and four electrode groups, all of which are connected to the main body. The four electrode groups are divided into two positive electrode groups and two negative electrode groups. The two positive electrode groups can be connected to a first adapter plate at the same time, and the two negative electrode groups can be connected to a second adapter plate at the same time. Each electrode group provides the maximum current-carrying area of ​​the battery cell.

[0005] In one embodiment, the main body has a first side, and four electrode groups are arranged sequentially along the extension direction of the first side and are all connected to the first side. In the extension direction of the first side, the length of the four electrode groups is equal, and the ratio of the sum of the lengths of the four electrode groups to the length of the first side is 0.45 to 0.7.

[0006] In one embodiment, the length of the tab assembly is 40mm to 60mm.

[0007] In one embodiment, the height of the tab assembly is 20mm to 45mm.

[0008] In one embodiment, the positive electrode group and the negative electrode group are symmetrically arranged on both sides of the midpoint of the first side.

[0009] In one embodiment, along the arrangement direction of the four electrode groups, two positive electrode groups are arranged adjacent to each other, and two negative electrode groups are arranged adjacent to each other. The distance between the two electrode groups in the middle position is greater than the distance between the two positive electrode groups, and the distance between the two electrode groups in the middle position is greater than the distance between the two negative electrode groups.

[0010] In one embodiment, the distance between the two electrode tabs in the middle position is 80mm to 130mm, the distance between the two positive electrode tabs is 10mm to 30mm, and the distance between the two negative electrode tabs is 10mm to 30mm.

[0011] A battery includes a first adapter plate, a second adapter plate, and the aforementioned battery cells, wherein there are two battery cells, the first adapter plate connects all the positive electrode tabs of the two battery cells, and the second adapter plate connects all the negative electrode tabs of the two battery cells.

[0012] In one embodiment, all the positive tabs of the two battery cells are connected to the same side of the first adapter plate, and all the negative tabs of the two battery cells are connected to the same side of the second adapter plate.

[0013] In one embodiment, the first adapter piece is an aluminum adapter piece; and / or, the second adapter piece is a copper adapter piece.

[0014] The beneficial effects of the battery cell provided in this application embodiment are as follows: Since the battery cell has two positive tab groups and two negative tab groups, the four tab groups working together allow the internal stress generated during charging and discharging, as well as the external forces applied due to vibration during transportation, to be more evenly distributed across each tab group. This effectively prevents excessive stress concentration at any single tab group, thereby reducing the risk of tab group tearing and significantly improving the stability and service life of the battery cell. Furthermore, both positive tab groups are simultaneously connected to the first adapter plate, thus enabling current transmission through the first adapter plate. Similarly, both negative tab groups are simultaneously connected to the second adapter plate, enabling current transmission through the second adapter plate. Thus, the battery cell can form two current transmission paths. Since each tab group provides the maximum current-carrying area required for normal charging and discharging, tearing of any tab group will not affect the normal operation of the battery cell, thereby improving the current-carrying stability and safety of the battery cell.

[0015] The beneficial effects of the battery provided in this application embodiment are as follows: the battery includes the above-mentioned battery cell, and since the risk of the tab assembly in the battery cell being torn is low, the current conduction stability and safety are high, thereby improving the overall performance of the battery. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the battery cell structure provided in an embodiment of this application;

[0018] Figure 2 This is a schematic diagram of the connection structure of two battery cells in a battery provided in an embodiment of this application;

[0019] Figure 3 for Figure 2 Right view of the structure shown;

[0020] The following are the labeling elements in the figure:

[0021] 10. Battery cell; 100. Main body; 110. First side; 200. Electrode assembly; 210. Positive electrode assembly; 220. Negative electrode assembly; 230. Root; 240. Head; 300. First adapter piece; 400. Second adapter piece; 500. Battery; 600. Solder mark. Detailed Implementation

[0022] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0023] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0024] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0026] Please refer to the following: Figures 1 to 3 The battery cell 10 provided in the embodiments of this application will now be described. The battery cell 10 includes a main body 100 and four electrode groups 200, all of which are connected to the main body 100. The four electrode groups 200 are divided into two positive electrode groups 210 and two negative electrode groups 220. The two positive electrode groups 210 can be connected to the first adapter plate 300 at the same time, and the two negative electrode groups 220 can be connected to the second adapter plate 400 at the same time. Each electrode group 200 provides the maximum current-carrying area of ​​the battery cell 10.

[0027] It is understood that the battery cell 10 includes multiple positive electrode plates and multiple negative electrode plates. Each positive electrode plate has two spaced-apart positive tabs, and each negative electrode plate has two spaced-apart negative tabs. The positive and negative electrode plates are stacked alternately, and the overlapping parts of the positive and negative electrode plates together constitute the main body 100. The positive tabs of the multiple positive electrode plates are stacked to form two positive tab groups 210, and the negative tabs of the multiple negative electrode plates are stacked to form two negative tab groups 220. Thus, the two positive tab groups 210 and the two negative tab groups 220 constitute four tab groups 200 connected to the main body 100.

[0028] In the aforementioned battery cell 10, since two positive tab groups 210 and two negative tab groups 220 are provided, the four tab groups 200 work together to ensure that the internal stress generated during the charging and discharging of the battery cell 10 and the external force applied due to vibration during transportation can be more evenly distributed at each tab group 200. This effectively prevents excessive stress concentration at any one tab group 200, thereby reducing the risk of the tab group 200 tearing and significantly improving the stability and service life of the battery cell 10.

[0029] Furthermore, both positive tab groups 210 are simultaneously connected to the first adapter plate 300, thus enabling current transmission through the first adapter plate 300. Similarly, both negative tab groups 220 are simultaneously connected to the second adapter plate 400, enabling current transmission through the second adapter plate 400. In this way, the battery cell 10 can form two current transmission paths. Since each tab group 200 provides the maximum current-carrying area for the battery cell 10, meaning each tab group 200 can provide the maximum current-carrying area required for normal charging and discharging of the battery cell 10, tearing of any tab group 200 will not affect the normal operation of the battery cell 10, thereby improving the current-carrying stability and safety of the battery cell 10.

[0030] Specifically, in this application, the main body 100 has a first side 110, and four electrode groups 200 are arranged sequentially along the extension direction of the first side 110 (i.e., the direction of the X-axis in the figure) and are all connected to the first side 110. In the extension direction of the first side 110, the length of the four electrode groups 200 is equal, and the ratio of the sum of the lengths of the four electrode groups 200 to the length of the first side 110 is 0.45 to 0.7.

[0031] like Figure 1 As shown, for the tab assembly 200, the position where it connects to the first side 110 is the root 230, and the position away from the first side 110 is the head 240. The length of the tab assembly 200 can be understood as the dimension of the root 230 in the extension direction of the first side 110, which is L1 as shown in the figure. In this application, in the extension direction of the first side 110, the lengths of the four tab assemblies 200 are all equal and are all L1. The length dimension of the first side 110 is defined as L. The ratio of the sum of the length dimensions of the four tab assemblies 200 to the length dimension of the first side 110 is a = 4L1 / L, then 0.45 ≤ a ≤ 0.7.

[0032] By connecting all four tab groups 200 to the first side 110 of the main body 100, the battery cell 10 adopts a bipolar structure with the same pole on the same side. At the same time, the ratio α of the sum of the lengths of the four tab groups 200 to the length of the first side 110 is limited to between 0.45 and 0.7. This not only allows the four tab groups 200 to work together to distribute the force more evenly, reducing the risk of tearing of the tab groups 200, but also allows the length of the tab groups 200 to be larger, ensuring that each tab group 200 can provide the maximum overcurrent area required for normal charging and discharging of the battery cell 10.

[0033] Specifically, the length of the tab assembly 200 is 40mm to 70mm, meaning the value of L1 ranges from 40mm to 70mm. This design ensures that the tab assembly 200 has a large enough length to provide the maximum overcurrent area required for the normal charging and discharging of the battery cell 10.

[0034] Furthermore, the height of the tab assembly 200 is 20mm to 45mm. This height can be understood as the distance H from the head 240 to the root 230. If the height of the tab assembly 200 is too small, it will hinder the connection between the positive tab assembly 210 and the first adapter 300, and between the negative tab assembly 220 and the second adapter 400, and will also make it more prone to breakage due to stress concentration. If the height of the tab assembly 200 is too large, it will result in a longer current transmission path and increased internal resistance, and will also occupy more space, increasing the difficulty of packaging the cell 10. By setting the height H of the tab assembly 200 to 20mm to 45mm, the drawbacks of both excessively small and large heights can be addressed, resulting in a more rational structural design.

[0035] In this application, the positive tab group 210 and the negative tab group 220 are symmetrically arranged on both sides of the midpoint of the first side 110. It can be understood that the two positive tab groups 210 are located on one side of the midpoint of the first side 110, while the negative tab group 220 is located on the other side. The overall structure of the battery cell 10 exhibits axial symmetry, with the axis of symmetry being perpendicular to the first side 110 and passing through its midpoint. This arrangement ensures that the stress on the two positive tab groups 210 and the two negative tab groups 220 is equal, preventing the simultaneous tearing of either group due to uneven stress. Furthermore, the proximity of the two positive tab groups 210 facilitates simultaneous connection to the first adapter plate 300, and the proximity of the two negative tab groups 220 facilitates simultaneous connection to the second adapter plate 400.

[0036] In this embodiment, along the arrangement direction of the four tab groups 200, two positive tab groups 210 are arranged adjacent to each other, and two negative tab groups 220 are arranged adjacent to each other. The distance between the two tab groups 200 in the middle position is greater than the distance between the two positive tab groups 210, and the distance between the two tab groups 200 in the middle position is greater than the distance between the two negative tab groups 220.

[0037] Understandable, along Figure 1As shown in the extension direction of the first side 110, if the four tab groups 200 are defined as 1#, 2#, 3#, and 4# respectively, then 1# and 2# are both positive tab groups 210, and 3# and 4# are both negative tab groups 220. Therefore, the two tab groups 200 in the middle position are 2# and 3#, with a distance of L2 between them, L3 between 1# and 2#, and L4 between 3# and 4#. In this application, L2>L3, L2>L4. This arrangement allows the two tab groups 200 with opposite polarities, 2# and 3#, in the middle position to be far apart, avoiding the risk of short circuits caused by direct contact between the positive tab group 210 and the negative tab group 220 due to manufacturing errors or external impacts, thus improving the safety performance of the battery cell 10. Furthermore, since the two positive electrode groups 210 are relatively close to each other and the two negative electrode groups 220 are relatively close to each other, the two positive electrode groups 210 can be connected using a smaller first adapter piece 300 and the two negative electrode groups 220 can be connected using a smaller second adapter piece 400.

[0038] Specifically, the distance between the two tab groups 200 in the middle position is 80mm to 130mm, the distance between the two positive tab groups 210 is 10mm to 30mm, and the distance between the two negative tab groups 220 is 10mm to 30mm. That is, 80mm≤L2≤130mm, 10mm≤L3≤30mm, 10mm≤L4≤30mm.

[0039] Furthermore, in this application, the distance L3 between the two positive electrode groups 210 is equal to the distance L4 between the two negative electrode groups 220. In other embodiments, the two may be unequal.

[0040] like Figure 2 and Figure 3 As shown, this application also protects a battery 500, which includes a first adapter 300, a second adapter 400, and the aforementioned battery cell 10. There are two battery cells 10. The first adapter 300 connects all the positive tabs 210 of both battery cells 10, and the second adapter 400 connects all the negative tabs 220 of both battery cells 10. In this way, the two battery cells 10 can be connected in parallel, thereby increasing the capacity of the battery 500 and making it suitable for high-current discharge scenarios. Furthermore, since the battery 500 includes the aforementioned battery cell 10, the risk of tearing of the tab group 200 in the battery cell 10 is lower, and the current conduction stability and safety are higher, thus improving the overall performance of the battery 500.

[0041] Specifically, in this application, all positive tabs 210 of the two battery cells 10 are connected to the same side of the first adapter plate 300, and all negative tabs 220 of the two battery cells 10 are connected to the same side of the second adapter plate 400. It is understood that if all the positive tabs 210 are connected to both sides of the first adapter plate 300, and all the negative tabs 220 are connected to both sides of the second adapter plate 400, then the first adapter plate 300 and the second adapter plate 400 will bend and deform under the action of expansion force, leading to fatigue cracks and increasing assembly difficulty. In this application, by connecting all the positive tabs 210 to the same side of the first adapter plate 300 and all the negative tabs 220 to the same side of the second adapter plate 400, the assembly difficulty can be reduced, and the generation of fatigue cracks caused by the bending deformation of the first adapter plate 300 and the second adapter plate 400 can be overcome.

[0042] Specifically, the positive electrode assembly 210 is fixedly connected to the first adapter piece 300 by welding, thus forming a solder mark 600 between them. The negative electrode assembly 220 is fixedly connected to the second adapter piece 400 by welding, thus also forming a solder mark 600 between them. In this application, the first adapter piece 300 is an aluminum adapter piece, and the second adapter piece 400 is a copper adapter piece.

[0043] For the aforementioned battery 500, during the manufacturing process, the rolled positive electrode sheet and negative electrode sheet are first die-cut to prepare a positive electrode sheet with two positive tabs and a negative electrode sheet with two negative tabs. Then, the positive electrode sheet and negative electrode sheet are stacked to obtain the battery cell 10, so that the battery cell 10 has two positive tab groups 210 and two negative tab groups 200. After that, the first adapter piece 300 and the second adapter piece 400 are respectively placed under all the positive tab groups 210 and all the negative tab groups 220 of the two battery cells 10. Finally, all the positive tab groups 210 are welded together with the first adapter piece 300, and all the negative tab groups 220 are welded together with the second adapter piece 400.

[0044] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An electric cell, characterized by, The battery cell includes a main body and four electrode groups, all of which are connected to the main body. The four electrode groups are divided into two positive electrode groups and two negative electrode groups. The two positive electrode groups can be connected to a first adapter plate at the same time, and the two negative electrode groups can be connected to a second adapter plate at the same time. Each electrode group provides the maximum current-carrying area of ​​the battery cell.

2. The electric cell of claim 1, wherein, The main body has a first side, and four electrode groups are arranged sequentially along the extension direction of the first side and are all connected to the first side. In the extension direction of the first side, the length of the four electrode groups is equal, and the ratio of the sum of the length of the four electrode groups to the length of the first side is 0.45 to 0.

7.

3. The electric cell of claim 2, wherein, The length of the electrode assembly is 40mm to 60mm.

4. The electric cell of claim 3, wherein, The height of the electrode assembly is 20mm to 45mm.

5. The electric cell of claim 2, wherein, The positive electrode assembly and the negative electrode assembly are symmetrically arranged on both sides of the midpoint of the first side.

6. The electric cell of any one of claims 2 to 5, wherein, Along the arrangement direction of the four electrode groups, two positive electrode groups are arranged adjacent to each other, and two negative electrode groups are arranged adjacent to each other. The distance between the two electrode groups in the middle position is greater than the distance between the two positive electrode groups, and the distance between the two electrode groups in the middle position is greater than the distance between the two negative electrode groups.

7. The electric cell of claim 6, wherein, The distance between the two electrode tabs in the middle position is 80mm to 130mm, the distance between the two positive electrode tabs is 10mm to 30mm, and the distance between the two negative electrode tabs is 10mm to 30mm.

8. A battery, characterized by The device includes a first adapter piece, a second adapter piece, and a battery cell as described in any one of claims 1 to 7, wherein there are two battery cells, the first adapter piece connects all the positive tabs of the two battery cells, and the second adapter piece connects all the negative tabs of the two battery cells.

9. The battery of claim 8, wherein, All the positive tabs of the two battery cells are connected to the same side of the first adapter plate, and all the negative tabs of the two battery cells are connected to the same side of the second adapter plate.

10. The battery of claim 8, wherein, The first adapter piece is an aluminum adapter piece; and / or, the second adapter piece is a copper adapter piece.

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