A battery

Abstract

Battery, characterized in that it comprises: two cell units (100), each cell unit (100) comprising a plurality of stacked single cells, and positive tabs and negative tabs of the plurality of single cells are each stacked sequentially; a cover plate assembly (200), the cover plate assembly (200) having a positive welding zone (210) and a negative welding zone (220); wherein: each cell unit (100) forms at least two positive welds (101) spaced apart in a first direction with the positive weld zone (210) and each cell unit (100) forms at least two negative welds (102) spaced apart in the first direction with the negative weld zone (220).

Description

FIELD OF TECHNOLOGY

[0001] The present utility model relates to the field of battery technology and, in particular, to a battery or accumulator. STATE OF THE ART

[0002] With the steady improvement in the energy density of lithium-ion batteries and the accelerated development of battery pack systems, there are increasingly high demands on the fast-charging capability of batteries. The current carrying capacity of the batteries also urgently needs to be improved. However, with the higher overcurrent requirements, the number of layers of battery tabs also increases. For the production process, this undoubtedly increases the complexity of manufacturing and reduces production efficiency.

[0003] Ensuring the functionality of the process while simultaneously increasing the current carrying capacity is therefore a technical task that requires an urgent solution. SUMMARY

[0004] The subject of the present utility model is the provision of a wound battery with a simple structure, easy assembly and high current carrying capacity. To achieve this objective, the present utility model uses the following technical solution:

[0005] The present utility model discloses a battery comprising: two cell units, each cell unit comprising a plurality of stacked single cells, and positive tabs and negative tabs of the plurality of single cells are each stacked sequentially; a cover plate assembly, the cover plate assembly having a positive weld zone and a negative weld zone; wherein: each cell unit forms two positive welds spaced apart in a first direction with the positive weld zone, and each cell unit forms two negative welds spaced apart in the first direction with the negative weld zone.

[0006] The advantageous effects of the battery of the present utility model are as follows: by arranging two unit cells, each comprising at least two single cells, the battery capacity requirement is ensured. The positive tabs and negative tabs of several single cells are each stacked sequentially, and each single cell and the cover plate assembly are provided with two positive welding points and two negative welding points, which increases the connection area between the single cells and the cover plate assembly and improves the current-carrying capacity of the battery. In the actual connection process, it is only necessary to first stack several single cells, then sequentially stack and weld the positive tabs of several single cells into one piece, similarly for the negative tabs, and then weld the unit cell to the cover plate assembly.This assembly method is very simple and can reduce the difficulty of process welding, which contributes to improving the processing efficiency of the battery.

[0007] The further aspects and advantages of the present utility model are partly set out in the following description, partly become apparent from the following description or result from the practical application of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic structural diagram of two cell units according to an embodiment of the present invention; Fig. 2 is a schematic structural diagram showing the connection between two cell units and a cover plate assembly according to an embodiment of the present invention; Fig. 3 is a developed schematic structural diagram of a first single cell in a cell unit according to an embodiment of the present invention; and Fig. 4 is a developed schematic structural diagram of a second single cell in a cell unit according to an embodiment of the present invention. Reference numbers:

[0008] 100 - cell unit; 110 - first single cell; 111 - first positive tab; 112 - first negative tab; 120 - second single cell; 121 - second positive tab; 122 - second negative tab; 101 - positive weld; 102 - negative weld; 200 - cover plate arrangement; 210 - positive welding zone; 220 - negative welding zone. DETAILED DESCRIPTION OF EMBODIMENTS

[0009] A further detailed description of the present utility model is provided below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are presented merely to illustrate the present utility model and not to limit the present utility model. Furthermore, it should be noted that, for ease of description, the drawings show only parts of the present utility model and not the entire structure.

[0010] Unless otherwise specified and limited, the terms "connected," "connection," and "attached" in the description of the present utility model are used broadly. They may mean, for example, a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection via an intermediate medium; an internal communication between two components; or an interaction relationship between two components. A person skilled in the art will understand the specific meanings of the above terms in the present utility model according to specific situations.

[0011] In the description of the embodiments, orientation and positional relationships such as "upper," "lower," "right," etc., are based on the orientation and positional relationships illustrated in the accompanying drawings. These terms are for convenience of description and operation only and do not indicate or imply that the recited devices or components must have a particular orientation or be constructed and operated in a particular orientation. Therefore, these terms should not be construed as limitations of the present utility model. Furthermore, the terms "first," "second," etc., are used in the description for differentiation purposes only and have no specific meaning.

[0012] The present utility model discloses a battery. As in Fig. 1 and Fig. 2, the battery includes two cell units 100 and a cover plate assembly 200. Each cell unit 100 includes a plurality of stacked individual cells, with positive tabs and negative tabs of the plurality of individual cells each stacked sequentially. The cover plate assembly 200 includes a positive weld zone 210 and a negative weld zone 220. Each cell unit 100 forms two positive welds 101 spaced apart in a first direction with the positive weld zone 210, and each cell unit 100 forms two negative welds 102 spaced apart in the first direction with the negative weld zone 220. It can be understood that the battery capacity requirement is ensured by arranging two cell units 100, each comprising at least two individual cells.The positive tabs and negative tabs of multiple single cells are each stacked sequentially, and each single cell and the cover plate assembly 200 are provided with two positive welds 101 and two negative welds 102, which increases the connection area between the single cells and the cover plate assembly 200 and improves the current-carrying capacity of the battery. In the actual connection process, it is only necessary to first stack multiple single cells, then sequentially stack and weld the positive tabs of multiple single cells into one piece, similarly for the negative tabs, and then weld the cell unit 100 to the cover plate assembly 200. This assembly method is very simple and can reduce the difficulty of process welding, thus contributing to improving the processing efficiency of the battery.

[0013] It should also be noted that in the present utility model, the positive welding zone 210 and the negative welding zone 220 can be formed by a positive adapter tab and a negative adapter tab on the cover plate assembly 200, or by a positive pole and a negative pole. The positive welding zone 210 and the negative welding zone 220 formed on the cover plate assembly 200 are prior art and are not described in detail here.

[0014] Optionally, in two adjacent individual cells, a line passing through the geometric center of the cover plate arrangement 200 and perpendicular to the cover plate arrangement 200,as a reference line; where: in two adjacent individual cells, in the first direction, a dimension of the positive tab of the individual cell closer to the reference line is greater than a dimension of the positive tab of the individual cell further from the reference line; a dimension of the negative tab of the individual cell closer to the reference line is greater than a dimension of the negative tab of the individual cell further from the reference line; in the second direction, a dimension of the positive tab of the individual cell closer to the reference line is smaller than a dimension of the positive tab of the individual cell further from the reference line; a dimension of the negative tab of the individual cell closer to the reference line is smaller than a dimension of the negative tab of the individual cell further from the reference line. It can be seen,Such a structural configuration simplifies the stacking of multiple positive tabs, and in the actual assembly process, overlapping portions of multiple sequentially stacked positive tabs are first welded together to complete the stacking of the multiple individual cells. During the welding process with the cover plate assembly 200, the overlapping portions of multiple sequentially stacked positive tabs are then welded to the positive welding zone 210. In the first direction, a portion where the positive tab with the largest dimension protrudes beyond the remaining positive tabs forms another positive welding point 101 with the positive welding zone 210. In this way, the two positive welding points 101 do not interfere with each other during the manufacturing process, which reduces the difficulty of process welding.

[0015] It should be noted that a single cell typically has multiple stacked electrode plate structures (multiple positive plates, multiple negative plates, and multiple separators). The positive tab mentioned above refers to the positive tab of the entire single cell after stacking the positive tabs of multiple electrode plates, meaning that the positive tab has a multi-layer structure. The negative tab also has a multi-layer structure.

[0016] In addition, the single cell in the present embodiment may be a wound cell or a stacked cell, and the specific type may be selected depending on the actual need.

[0017] The following description assumes as an example that each cell unit 100 contains two individual cells, in particular a first individual cell 110 and a second individual cell 120. As in Fig.3 and 4, the first single cell 110 has a first positive tab 111 and a first negative tab 112, and the second single cell 120 has a second positive tab 121 and a second negative tab 122: in the first direction, a dimension of the first positive tab 111 is smaller than a dimension of the second positive tab 121 and a dimension of the first negative tab 112 is smaller than a dimension of the second negative tab 122; in the second direction, a dimension of the first positive tab 111 is greater than a dimension of the second positive tab 121 and a dimension of the first negative tab 112 is greater than a dimension of the second negative tab 122.

[0018] Optionally, in the first direction, the dimension of the first positive tab 111 is in the range of 10 mm to 20 mm, and in the second direction, the dimension of the first positive tab 111 is in the range of 35 mm to 45 mm. Specifically, the dimension of the first positive tab 111 in the first direction can be 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, or 20 mm, and other values ​​between 10 mm and 20 mm can also be selected for the dimension of the first positive tab 111 in the first direction, which is not limited to the above examples. The dimension of the first positive tab 111 in the second direction may be 35 mm, 36 mm, 37 mm, 38 mm, 39 mm, 40 mm, 41 mm, 42 mm, 43 mm, 44 mm or 45 mm, and other values ​​between 35 mm and 45 mm may also be selected for the dimension of the first positive tab 111 in the second direction, this is not limited to the above examples.It can be seen that if the dimensions of the first positive tab 111 in the first direction and the second direction are too large, the tab occupies a large area, thereby wasting space. If the dimensions of the first positive tab 111 in the first direction and the second direction are too small, the connection strength between the first positive tab 111 and the second positive tab 121 is reduced and also results in a reduced connection area between the cell unit 100 and the cover plate assembly 200, which is not conducive to improving the current-carrying capacity of the battery. In the present embodiment, the first positive tab 111 is rectangular, with a dimension in the first direction limited to 10 mm to 20 mm and a dimension in the second direction limited to 35 mm to 45 mm.This allows control over the area occupied by the first positive tab 111 while ensuring a sufficient connection area between the cell unit 100 and the cover plate assembly 200 and ensures good current carrying capacity of the battery, which is beneficial for improving the energy density of the battery.

[0019] Optionally, in the first direction, the dimension of the first negative tab 112 is in the range of 10 mm to 20 mm, and in the second direction, the dimension of the first negative tab 112 is in the range of 35 mm to 45 mm. Specifically, the dimension of the first negative tab 112 in the first direction may be 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, or 20 mm, and other values ​​between 10 mm and 20 mm may also be selected for the dimension of the first negative tab 112 in the first direction, not limited to the above examples. The dimension of the first negative tab 112 in the second direction may be 35 mm, 36 mm, 37 mm, 38 mm, 39 mm, 40 mm, 41 mm, 42 mm, 43 mm, 44 mm or 45 mm, and other values ​​between 35 mm and 45 mm may also be selected for the dimension of the first negative tab 112 in the second direction, this is not limited to the above examples.It can be seen that if the dimensions of the first negative tab 112 in the first direction and the second direction are too large, the tab occupies a large area, thereby wasting space. If the dimensions of the first negative tab 112 in the first direction and the second direction are too small, the connection strength between the first negative tab 112 and the second negative tab 112 is reduced and also results in a reduced connection area between the cell unit 100 and the cover plate assembly 200, which is not conducive to improving the current-carrying capacity of the battery. In the present embodiment, the first negative tab 112 is rectangular, with a dimension in the first direction limited to 10 mm to 20 mm and a dimension in the second direction limited to 35 mm to 45 mm.This allows control over the area occupied by the first negative tab 112 while ensuring a sufficient connection area between the cell unit 100 and the cover plate assembly 200 and ensures good current carrying capacity of the battery, which is beneficial for improving the energy density of the battery.

[0020] Optionally, in the first direction, the dimension of the second positive tab 121 is in the range of 25 mm to 35 mm, and in the second direction, the dimension of the second positive tab 121 is in the range of 14 mm to 24 mm. Specifically, the dimension of the second positive tab 121 in the first direction may be 25 mm, 26 mm, 27 mm, 28 mm, 29 mm, 30 mm, 31 mm, 32 mm, 33 mm, 34 mm, or 35 mm, and other values ​​between 25 mm and 35 mm may also be selected for the dimension of the second positive tab 121 in the first direction, not limited to the above examples. The dimension of the second positive tab 121 in the second direction may be 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm or 24 mm, and other values ​​between 14 mm and 24 mm may also be selected for the dimension of the second positive tab 121 in the second direction, which is not limited to the above examples.In the present embodiment, the second positive tab 121 is rectangular, with a dimension in the first direction limited to 25 mm to 35 mm and a dimension in the second direction limited to 14 mm to 24 mm. This allows control over the area occupied by the second positive tab 121 while ensuring a sufficient connection area between the cell unit 100 and the cover plate assembly 200 and ensures good current carrying capacity of the battery, which is beneficial for improving the energy density of the battery.

[0021] Optionally, in the first direction, a dimension of the second negative tab 122 is in the range of 25 mm to 35 mm, and in the second direction, a dimension of the second negative tab 122 is in the range of 14 mm to 24 mm. Specifically, the dimension of the second negative tab 122 in the first direction may be 25 mm, 26 mm, 27 mm, 28 mm, 29 mm, 30 mm, 31 mm, 32 mm, 33 mm, 34 mm, or 35 mm, and other values ​​between 25 mm and 35 mm may also be selected for the dimension of the second negative tab 122 in the first direction, which is not limited to the above examples. The dimension of the second negative tab 122 in the second direction may be 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm or 24 mm, and other values ​​between 14 mm and 24 mm may also be selected for the dimension of the second negative tab 122 in the second direction, this is not limited to the above examples.In the present embodiment, the second negative tab 122 is rectangular, with a dimension in the first direction limited to 25 mm to 35 mm and a dimension in the second direction limited to 14 mm to 24 mm. This allows control over the area occupied by the second negative tab 122 while ensuring a sufficient connection area between the cell unit 100 and the cover plate assembly 200 and ensures good current carrying capacity of the battery, which is advantageous for improving the energy density of the battery.

[0022] Optionally, in the first direction, a dimension of the positive weld 101 is in the range of 11 mm to 21 mm, and in the second direction, a dimension of the positive weld 101 is in the range of 2 mm to 12 mm. Specifically, the dimension of the positive weld 101 in the first direction may be 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, or 21 mm, and other values ​​between 11 mm and 21 mm may also be selected for the dimension of the positive weld 101 in the first direction, which is not limited to the above examples. The dimension of the positive welding point 101 in the second direction may be 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm or 12 mm, and other values ​​between 2 mm and 12 mm may also be selected for the dimension of the positive welding point 101 in the second direction, this is not limited to the above examples.In the present embodiment, the positive weld 101 is rectangular, with a dimension in the first direction limited to 11 mm to 21 mm and a dimension in the second direction limited to 2 mm to 12 mm. This prevents internal short circuits due to excessive dimensions of the positive weld 101 while ensuring a sufficient connection area between the cell unit 100 and the cover plate assembly 200 and ensures good current carrying capacity of the battery.

[0023] Optionally, in the first direction, a dimension of the negative weld 102 is in the range of 11 mm to 21 mm, and in the second direction, a dimension of the negative weld 102 is in the range of 2 mm to 12 mm. Specifically, the dimension of the negative weld 102 in the first direction may be 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, or 21 mm, and other values ​​between 11 mm and 21 mm may also be selected for the dimension of the negative weld 102 in the first direction, which is not limited to the above examples. The dimension of the negative weld 102 in the second direction may be 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm or 12 mm, and other values ​​between 2 mm and 12 mm may also be selected for the dimension of the negative weld 102 in the second direction, this is not limited to the above examples.In the present embodiment, the negative weld 102 is rectangular, with a dimension in the first direction limited to 11 mm to 21 mm and a dimension in the second direction limited to 2 mm to 12 mm. This prevents internal short circuits due to excessive dimensions of the negative weld 102 while ensuring a sufficient connection area between the cell unit 100 and the cover plate assembly 200 and ensures good current carrying capacity of the battery.

[0024] An area ratio of the first positive tab 111 to the second positive tab 121 is optionally 1.05:1 to 1.1:1. The area ratio of the first positive tab 111 to the second positive tab 121 may, in particular, be 1.05:1, 1.06:1, 1.07:1, 1.08:1, 1.09:1, or 1.1:1, and may also assume other values ​​within the above range without being limited to the examples.

[0025] An area ratio of the second positive tab 121 to the positive weld point 101 is optionally 4:1 to 6:1. The area ratio of the second positive tab 121 to the positive weld point 101 can be, in particular, 4:1, 4.1:1, 4.2:1, 4.3:1, 4.4:1, 4.5:1, 4.6:1, 4.7:1, 4.8:1, 4.9:1, 5:1, 5.1:1, 5.2:1, 5.3:1, 5.4:1, 5.5:1, 5.6:1, 5.7:1, 5.8:1, 5.9:1, 6:1, and can also assume other values ​​within the above range, without being limited to the examples.

[0026] An area ratio of the first negative tab 112 to the second negative tab 122 is optionally 1.05:1 to 1.1:1. The area ratio of the first negative tab 112 to the second negative tab 122 may, in particular, be 1.05:1, 1.06:1, 1.07:1, 1.08:1, 1.09:1, or 1.1:1, and may also assume other values ​​within the above range without being limited to the examples.

[0027] An area ratio of the second negative tab 122 to the negative weld point 102 is optionally 4:1 to 6:1. The area ratio of the second negative tab 122 to the negative weld point 102 can in particular be 4:1, 4.1:1, 4.2:1, 4.3:1, 4.4:1, 4.5:1, 4.6:1, 4.7:1, 4.8:1, 4.9:1, 5:1, 5.1:1, 5.2:1, 5.3:1, 5.4:1, 5.5:1, 5.6:1, 5.7:1, 5.8:1, 5.9:1, 6:1 and can also assume other values ​​within the above range, without being limited to the examples.

[0028] In a particular embodiment, the first positive tab 111 is a 15 mm x 40 mm rectangle, the first negative tab 112 is a 15 mm x 40 mm rectangle, the second positive tab 121 is a 19 mm x 30 mm rectangle, the second negative tab 122 is a 19 mm x 30 mm rectangle, the positive weld 101 is a 7 mm x 16 mm rectangle, and the negative weld 102 is a 7 mm x 16 mm rectangle. The area ratio of the first positive tab 111, the second positive tab 121, and the positive weld 101 is 300:285:56; the area ratio of the first negative tab 112, the second negative tab 122, and the negative weld 102 is 300:285:56.

[0029] In the description of this document, references to terms such as "some embodiments," "other embodiments," etc., indicate that the particular features, structures, materials, or properties described in connection with the embodiment or example are included in at least one embodiment or at least one example of the present utility model. In this description, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the described particular features, structures, materials, or properties may be combined as appropriate in one or more embodiments or examples.

[0030] The above embodiments of the present utility model are merely examples to illustrate the present utility model and do not represent limitations on the implementation method of the present utility model. Various obvious modifications, adaptations, and substitutions can be made by an average person skilled in the art without departing from the scope of the present utility model. A list of all implementation methods is neither necessary nor possible here. Modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model are intended to be included within the scope of the claims of the present utility model.

Claims

[1] Battery, characterized in that it comprises: two cell units (100), each cell unit (100) comprising a plurality of stacked single cells, and positive tabs and negative tabs of the plurality of single cells are each stacked sequentially; a cover plate assembly (200), the cover plate assembly (200) having a positive welding zone (210) and a negative welding zone (220); wherein: each cell unit (100) forms at least two positive welds (101) spaced apart in a first direction with the positive weld zone (210) and each cell unit (100) forms at least two negative welds (102) spaced apart in the first direction with the negative weld zone (220). [2] Battery according to claim 1, characterized in that in two adjacent individual cells, a line passing through a geometric center of the cover plate arrangement (200) and perpendicular to the cover plate arrangement (200) is provided as a reference line; wherein: in two adjacent individual cells in the first direction, a dimension of the positive tab of the individual cell closer to the reference line is greater than a dimension of the positive tab of the individual cell further from the reference line; a dimension of the negative tab of the individual cell closer to the reference line is greater than a dimension of the negative tab of the individual cell further from the reference line; in a second direction, a dimension of the positive tab of the single cell closer to the reference line is smaller than a dimension of the positive tab of the single cell farther from the reference line; a dimension of the negative tab of the single cell closer to the reference line is smaller than a dimension of the negative tab of the single cell farther from the reference line; where: a surface on which the plurality of positive tabs sequentially overlap forms a positive weld (101) with the positive weld zone (210), and in the first direction, a portion in which the positive tab with the largest dimension projects beyond the remaining positive tabs forms another positive weld (101) with the positive weld zone (210); an area on which the plurality of negative tabs sequentially overlap forms a negative weld (102) with the negative weld zone (220), and in the first direction, a portion in which the negative tab with the largest dimension projects beyond the remaining negative tabs forms another negative weld (102) with the negative weld zone (220). [3] Battery according to claim 2, characterized in that the individual cells comprise two individual cells, which are a first individual cell (110) and a second individual cell (120), the first individual cell (110) has a first positive tab (111) and a first negative tab (112), and the second individual cell (120) has a second positive tab (121) and a second negative tab (122); wherein: in the first direction, a dimension of the first positive tab (111) is smaller than a dimension of the second positive tab (121) and a dimension of the first negative tab (112) is smaller than a dimension of the second negative tab (122); in the second direction, a dimension of the first positive tab (111) is greater than a dimension of the second positive tab (121) and a dimension of the first negative tab (112) is greater than a dimension of the second negative tab (122). [4] Battery according to claim 3, characterized in that in the first direction the dimension of the first positive tab (111) is in the range of 10 mm to 20 mm and in the second direction the dimension of the first positive tab (111) is in the range of 35 mm to 45 mm. [5] Battery according to claim 3 or 4, characterized in that in the first direction the dimension of the first negative tab (112) is in the range of 10 mm to 20 mm and in the second direction the dimension of the first negative tab (112) is in the range of 35 mm to 45 mm. [6] Battery according to one of claims 3 to 5, characterized in that in the first direction the dimension of the second positive tab (121) is in the range of 25 mm to 35 mm and in the second direction the dimension of the second positive tab (121) is in the range of 14 mm to 24 mm. [7] Battery according to one of claims 3 to 6, characterized in that in the first direction the dimension of the second negative tab (122) is in the range of 25 mm to 35 mm and in the second direction the dimension of the second negative tab (122) is in the range of 14 mm to 24 mm. [8] Battery according to one of claims 3 to 7, characterized in that an area ratio of the first positive tab (111) to the second positive tab (121) is 1.05:1 to 1.1:1; and / or: an area ratio of the second positive tab (121) to the positive weld point (101) is 4:1 to 6:1; and / or: an area ratio of the first negative tab (112) to the second negative tab (122) is 1.05:1 to 1.1:1; and / or: an area ratio of the second negative tab (122) to the negative weld point (102) is 4:1 to 6:

1. [9] Battery according to one of claims 1 to 8, characterized in that in the first direction a dimension of the positive welding point (101) is in the range of 11 mm to 21 mm and in the second direction a dimension of the positive welding point (101) is in the range of 2 mm to 12 mm. [10] Battery according to one of claims 1 to 9, characterized in that in the first direction a dimension of the negative welding point (102) is in the range of 11 mm to 21 mm and in the second direction a dimension of the negative welding point (102) is in the range of 2 mm to 12 mm. [11] Battery according to one of claims 1 to 10, characterized in that the single cell is a wound cell.

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