Battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery which comprises two battery cell units and a cover plate assembly, each battery cell unit comprises a plurality of stacked single battery cells, positive pole lug parts and negative pole lug parts of the single battery cells are respectively and sequentially stacked, the cover plate assembly is provided with a positive pole welding area and a negative pole welding area, and the positive pole welding area and the negative pole welding area are arranged on the cover plate assembly. Two positive electrode welding marks which are arranged at intervals in the first direction are formed between each battery cell unit and the positive electrode welding area, and two negative electrode welding marks which are arranged at intervals in the first direction are formed between each battery cell unit and the negative electrode welding area. The winding battery is simple in structure, convenient to assemble and relatively high in overcurrent capability.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery technical field especially relates to a battery. BACKGROUND

[0002] With the continuous improvement of lithium ion battery energy density, and the battery pack system development speed accelerates, the fast charging ability requirement of battery is higher and higher, at the same time, the overcurrent capacity in the battery is also urgently needed to improve. However, with the improvement of overcurrent requirement, the battery tab layer is also increased. For manufacturing process, undoubtedly, it improves the manufacturing difficulty, and reduces the manufacturing efficiency.

[0003] Therefore, it is currently an urgent technical problem to be solved to increase the overcurrent capacity while ensuring the operability of the process. SUMMARY

[0004] The utility model discloses a kind of winding batteries, and the structure of the winding battery is simple, easy to assemble and has greater overcurrent capacity.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] The utility model discloses a kind of batteries, comprising: two electric core units, each electric core unit includes multiple stacked monomer batteries, the positive tab and the negative tab of multiple monomer batteries are sequentially stacked respectively;Cover plate assembly, the cover plate assembly has positive welding area and negative welding area;Wherein: each electric core unit and the positive welding area form two positive welding marks arranged along the first direction with interval, each electric core unit and the negative welding area form two negative welding marks arranged along the first direction with interval.

[0007] The battery of the utility model has the beneficial effects that: by setting two electric core units, and each electric core unit includes at least two monomer batteries, the battery capacity requirement can be guaranteed, the positive tab and the negative tab of multiple monomer batteries are sequentially stacked respectively, and each monomer battery is provided with two positive welding marks and two negative welding marks with the cover plate assembly, the connection area of monomer battery and cover plate assembly is increased, the overcurrent capacity of battery is improved, and in the actual connection process, only multiple monomer batteries are stacked first, then the positive tab of multiple monomer batteries is sequentially stacked and welded into one, and the negative tab is the same, then the electric core unit is welded with the cover plate assembly. This assembly method is very simple, and can reduce the welding difficulty of process, which is beneficial to improve the processing efficiency of battery.

[0008] Additional aspects and advantages of the utility model will be partially given in the following description, some will become obvious from the following description, or be understood through the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 is a structure schematic view of two electric core units of the embodiment of the utility model;

[0010] Figure 2 is a structure schematic view of two electric core units and cover plate assembly connection of the embodiment of the utility model;

[0011] Figure 3 is the development structure schematic view of the first single body electric core in an electric core unit of the embodiment of the utility model;

[0012] Figure 4 is the development structure schematic view of the second single body electric core in an electric core unit of the embodiment of the utility model.

[0013] Reference signs:

[0014] 100, electric core unit; 110, first single body electric core; 111, first positive pole lug; 112, first negative pole lug; 120, second single body electric core; 121, second positive pole lug; 122, second negative pole lug; 101, positive pole welding mark; 102, negative pole welding mark;

[0015] 200, cover plate assembly; 210, positive pole welding area; 220, negative pole welding area. DETAILED DESCRIPTION

[0016] The utility model will be further explained in detail below in combination with the drawings and embodiments.It can be understood that the specific embodiments described herein are only used to explain the utility model and not limit the utility model.In addition, it should be noted that in order to facilitate the description, only the part related to the utility model is shown in the drawings and not all structures.

[0017] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated;It can be mechanically connected, or it can be electrically connected;It can be directly connected, or it can be indirectly connected through an intermediate medium;It can be the internal communication of two elements or the interaction relationship of two elements.For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0018] In the description of the embodiment, the terms "up", "down", "right", etc. The orientation or position relationship shown in the drawing is only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, so it cannot be understood as a limitation on the utility model.In addition, the terms "first", "second" are only used to distinguish in the description and have no special meaning.

[0019] The utility model discloses a battery, reference Figure 1 And Figure 2 As shown in the figure, the battery comprises two battery cell units 100 and a cover plate assembly 200, each battery cell unit 100 comprises a plurality of stacked single battery cells, the positive and negative tab of the plurality of single battery cells are sequentially stacked respectively, and the cover plate assembly 200 is provided with a positive welding area 210 and a negative welding area 220. Each battery cell unit 100 and the positive welding area 210 form two positive welding marks 101 arranged at intervals along the first direction, and each battery cell unit 100 and the negative welding area 220 form two negative welding marks 102 arranged at intervals along the first direction. It can be understood that by arranging two battery cell units 100, and each battery cell unit 100 comprising at least two single battery cells, the battery capacity requirement can be ensured, the positive and negative tab of the plurality of single battery cells are sequentially stacked respectively, and each single battery cell is provided with two positive welding marks 101 and two negative welding marks 102 on the cover plate assembly 200, the connection area of the single battery cell and the cover plate assembly 200 is increased, the overcurrent capacity of the battery is improved, and in the actual connection process, only the plurality of single battery cells need to be stacked first, then the positive tab of the plurality of single battery cells is sequentially stacked and welded into one, and the negative tab is the same, then the battery cell unit 100 and the cover plate assembly 200 are welded, the assembly method is very simple, the process welding difficulty can be reduced, and the processing efficiency of the battery can be improved.

[0020] It should be noted that in the utility model, the positive welding area 210 and the negative welding area 220 can be composed of the positive and negative adapter plates on the cover plate assembly 200, or composed of the positive and negative columns, the positive welding area 210 and the negative welding area 220 formed on the cover plate assembly 200 are prior art, and the positive welding area 210 and the negative welding area 220 will not be described in detail.

[0021] Optionally, among the two adjacent single battery cells, a straight line passing through the geometric center of the cover plate assembly 200 and perpendicular to the cover plate assembly 200 is taken as a reference line; wherein: among the two adjacent single battery cells, in the first direction, the size of the positive tab of the single battery cell close to the reference line is greater than that of the single battery cell away from the reference line; the size of the negative tab of the single battery cell close to the reference line is greater than that of the single battery cell away from the reference line; in the second direction, the size of the positive tab of the single battery cell close to the reference line is smaller than that of the single battery cell away from the reference line; the size of the negative tab of the single battery cell close to the reference line is smaller than that of the single battery cell away from the reference line; it can be understood that such a structure facilitates the stacking of multiple positive tabs, and in the actual assembly process, the area where the multiple positive tabs overlap in turn is first welded together to complete the stacking of the multiple single battery cells, and in the process of welding with the cover plate assembly 200, the area where the multiple positive tabs overlap in turn is welded with the positive welding area 210 again, in the first direction, the part of the largest positive tab that exceeds the rest of the positive tabs forms another positive welding mark 101 with the positive welding area 210, so that the two positive welding marks 101 do not affect each other in the processing process, reducing the difficulty of process welding.

[0022] It should be noted that the single battery cell usually includes multiple stacked tab structures (multiple positive tabs, multiple negative tabs, and multiple separators), and the positive tab described above refers to the entire positive tab of the single battery cell after the positive tab of the multiple tabs is stacked, i.e., the positive tab is a multi-layer structure, and the negative tab is also a multi-layer structure.

[0023] In addition, the single battery cell of the present embodiment can be a winding battery cell or a laminated battery cell, and the specific type can be selected according to actual needs.

[0024] The following will be described in detail taking an example that each battery cell unit 100 contains two single battery cells, and the first single battery cell 110 and the second single battery cell 120. Figure 3 and Figure 4 As shown in FIGS. 1 and 2, the first single battery cell 110 has a first positive tab 111 and a first negative tab 112, and the second single battery cell 120 has a second positive tab 121 and a second negative tab 122: in the first direction, the size of the first positive tab 111 is smaller than that of the second positive tab 121, and the size of the first negative tab 112 is smaller than that of the second negative tab 122; in the second direction, the size of the first positive tab 111 is greater than that of the second positive tab 121, and the size of the first negative tab 112 is greater than that of the second negative tab 122.

[0025] Optionally, the size of the first positive tab 111 along the first direction is in the range of 10mm-20mm, and the size of the first positive tab 111 along the second direction is in the range of 35mm-45mm. Specifically, the size of the first positive tab 111 along the first direction can be 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, and the size of the first positive tab 111 along the first direction can also be selected from other values within the range of 10mm-20mm, which are not limited to the above examples. The size of the first positive tab 111 along the second direction can be 35mm, 36mm, 37mm, 38mm, 39mm, 40mm, 41mm, 42mm, 43mm, 44mm, 45mm, and the size of the first positive tab 111 along the second direction can also be selected from other values within the range of 35mm-45mm, which are not limited to the above examples. It can be understood that if the size of the first positive tab 111 along the first direction and the second direction is too large, it will occupy a large area, causing space waste, and if the size is too small, it will reduce the connection strength of the first positive tab 111 and the second positive tab 121, and will also reduce the connection area of the battery cell unit 100 and the cover plate assembly 200, which is not conducive to improving the overcurrent capacity of the battery. In this embodiment, the first positive tab 111 is set to be rectangular, and the size along the first direction is controlled to be in the range of 10mm-20mm, and the size along the second direction is controlled to be in the range of 35mm-45mm, which can control the occupied area of the first positive tab 111 under the premise of ensuring the connection area of the battery cell unit 100 and the cover plate assembly 200 is sufficient and ensuring the battery has good overcurrent capacity, which is conducive to improving the energy density of the battery.

[0026] Optionally, the size of the first negative tab 112 along the first direction is in the range of 10mm-20mm, and the size of the first negative tab 112 along the second direction is in the range of 35mm-45mm. Specifically, the size of the first negative tab 112 along the first direction can be 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, and the size of the first negative tab 112 along the first direction can also be selected from other values within the range of 10mm-20mm, which are not limited to the above examples. The size of the first negative tab 112 along the second direction can be 35mm, 36mm, 37mm, 38mm, 39mm, 40mm, 41mm, 42mm, 43mm, 44mm, 45mm, and the size of the first negative tab 112 along the second direction can also be selected from other values within the range of 35mm-45mm, which are not limited to the above examples. It can be understood that if the size of the first negative tab 112 along the first direction and the second direction is too large, it will occupy a large area, causing space waste, and if the size is too small, it will reduce the connection strength of the first negative tab 112 and the second negative tab 122, and will also reduce the connection area of the battery cell unit 100 and the cover plate assembly 200, which is not conducive to improving the overcurrent capacity of the battery. In this embodiment, the first negative tab 112 is set to be rectangular, and the size along the first direction is controlled to be in the range of 10mm-20mm, and the size along the second direction is controlled to be in the range of 35mm-45mm, which can control the occupied area of the first negative tab 112 under the premise of ensuring the connection area of the battery cell unit 100 and the cover plate assembly 200 is sufficient and ensuring the battery has good overcurrent capacity, which is conducive to improving the energy density of the battery.

[0027] Optionally, the size of the second positive tab 121 in the first direction ranges from 25mm to 35mm, and the size of the second positive tab 121 in the second direction ranges from 14mm to 24mm. Specifically, the size of the second positive tab 121 in the first direction can be 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, 31mm, 32mm, 33mm, 34mm, 35mm, and the size of the second positive tab 121 in the first direction can also be selected from other values between 25mm and 35mm, which are not limited to the above examples. The size of the second positive tab 121 in the second direction can be 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, and the size of the second positive tab 121 in the second direction can also be selected from other values between 14mm and 24mm, which are not limited to the above examples. In this embodiment, the second positive tab 121 is set to be rectangular, and the size in the first direction is controlled to be within the range of 25mm to 35mm, and the size in the second direction is controlled to be within the range of 14mm to 24mm. Under the premise of ensuring that the connection area of the battery cell unit 100 and the cover plate assembly 200 is sufficient and the battery has good overcurrent capacity, the occupied area of the second positive tab 121 can be controlled, which is beneficial to improve the energy density of the battery.

[0028] Optionally, the size of the second positive tab 121 in the first direction ranges from 25mm to 35mm, and the size of the second positive tab 121 in the second direction ranges from 14mm to 24mm. Specifically, the size of the second positive tab 121 in the first direction can be 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, 31mm, 32mm, 33mm, 34mm, 35mm, and the size of the second positive tab 121 in the first direction can also be selected from other values between 25mm and 35mm, which are not limited to the above examples. The size of the second positive tab 121 in the second direction can be 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, and the size of the second positive tab 121 in the second direction can also be selected from other values between 14mm and 24mm, which are not limited to the above examples. In this embodiment, the second positive tab 121 is set to be rectangular, and the size in the first direction is controlled to be within the range of 25mm to 35mm, and the size in the second direction is controlled to be within the range of 14mm to 24mm. Under the premise of ensuring that the connection area of the battery cell unit 100 and the cover plate assembly 200 is sufficient and the battery has good overcurrent capacity, the occupied area of the second positive tab 121 can be controlled, which is beneficial to improve the energy density of the battery.

[0029] Optionally, the size of the positive electrode welding pad 101 along the first direction ranges from 11 mm to 21 mm, and the size of the positive electrode welding pad 101 along the second direction ranges from 2 mm to 12 mm. Specifically, the size of the positive electrode welding pad 101 along the first direction can be 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, and the size of the positive electrode welding pad 101 along the first direction can also be selected from other values between 11 mm and 21 mm, which are not limited to the above examples. The size of the positive electrode welding pad 101 along the second direction can be 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, and the size of the positive electrode welding pad 101 along the second direction can also be selected from other values between 2 mm and 12 mm, which are not limited to the above examples. In this embodiment, the positive electrode welding pad 101 is set to be rectangular, and the size along the first direction is controlled to be within the range of 11 mm to 21 mm, and the size along the second direction is controlled to be within the range of 2 mm to 12 mm, which can ensure that the connection area of the battery cell unit 100 and the cover plate assembly 200 is sufficient, and can avoid the phenomenon of internal short circuit caused by the excessive size of the positive electrode welding pad 101 under the premise of ensuring that the battery has good overcurrent capacity.

[0030] Optionally, the size of the negative electrode welding pad 102 along the first direction ranges from 11 mm to 21 mm, and the size of the negative electrode welding pad 102 along the second direction ranges from 2 mm to 12 mm. Specifically, the size of the negative electrode welding pad 102 along the first direction can be 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, and the size of the negative electrode welding pad 102 along the first direction can also be selected from other values between 11 mm and 21 mm, which are not limited to the above examples. The size of the negative electrode welding pad 102 along the second direction can be 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, and the size of the negative electrode welding pad 102 along the second direction can also be selected from other values between 2 mm and 12 mm, which are not limited to the above examples. In this embodiment, the negative electrode welding pad 102 is set to be rectangular, and the size along the first direction is controlled to be within the range of 11 mm to 21 mm, and the size along the second direction is controlled to be within the range of 2 mm to 12 mm, which can ensure that the connection area of the battery cell unit 100 and the cover plate assembly 200 is sufficient, and can avoid the phenomenon of internal short circuit caused by the excessive size of the negative electrode welding pad 102 under the premise of ensuring that the battery has good overcurrent capacity.

[0031] Optionally, the area ratio of the first positive tab 111 and the second positive tab 121 is 1.05:1-1.1:1. Specifically, the area ratio of the first positive tab 111 and the second positive tab 121 can be 1.05:1, 1.06:1, 1.07:1, 1.08:1, 1.09:1 or 1.1:1, or other values within the above range, and is not limited to the examples.

[0032] Optionally, the area ratio of the second positive tab 121 and the positive welding pad 101 is 4:1-6:1. Specifically, the area ratio of the second positive tab 121 and the positive welding pad 101 can 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, or other values within the above range, and is not limited to the examples.

[0033] Optionally, the area ratio of the first negative tab 112 and the second negative tab 122 is 1.05:1-1.1:1. Specifically, the area ratio of the first negative tab 112 and the second negative tab 122 can be 1.05:1, 1.06:1, 1.07:1, 1.08:1, 1.09:1 or 1.1:1, or other values within the above range, and is not limited to the examples.

[0034] Optionally, the area ratio of the second negative tab 122 and the negative welding pad 102 is 4:1-6:1. Specifically, the area ratio of the second negative tab 122 and the negative welding pad 102 can 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, or other values within the above range, and is not limited to the examples.

[0035] In one specific embodiment, the first positive tab 111 is a rectangle of 15mm*40mm, the first negative tab 112 is a rectangle of 15mm*40mm, the second positive tab 121 is a rectangle of 19mm*30mm, the second negative tab 122 is a rectangle of 19mm*30mm, the positive welding pad 101 is a rectangle of 7mm*16mm, the negative welding pad 102 is a rectangle of 7mm*16mm, and the area ratio of the first positive tab 111, the second positive tab 121 and the positive welding pad 101 is 300:285:56; the area ratio of the first negative tab 112, the second negative tab 122 and the negative welding pad 102 is 300:285:56.

[0036] In the description of the present specification, the description referring to the terms "some embodiments", "other embodiments", and the like means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0037] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. For those skilled in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present application. Here, it is not necessary and impossible to enumerate all the implementation modes. Any modification, equivalent substitution and improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A battery, characterized by, The battery cell unit (100) comprises a plurality of stacked single battery cells, and the positive and negative tab portions of the plurality of single battery cells are sequentially stacked. The cover plate assembly (200) has a positive welding area (210) and a negative welding area (220); wherein: Each of the battery cell units (100) and the positive welding area (210) forms at least two positive welding marks (101) arranged along a first direction; and each of the battery cell units (100) and the negative welding area (220) forms at least two negative welding marks (102) arranged along the first direction. In the adjacent two single battery cells, a straight line passing through the geometric center of the cover plate assembly (200) and perpendicular to the cover plate assembly (200) is a reference line; wherein:

2. The battery of claim 1, wherein, In the adjacent two single battery cells, along the first direction, the size of the positive tab portion of the single battery cell close to the reference line is greater than that of the single battery cell away from the reference line; and the size of the negative tab portion of the single battery cell close to the reference line is greater than that of the single battery cell away from the reference line. Along the second direction, the size of the positive tab portion of the single battery cell close to the reference line is smaller than that of the single battery cell away from the reference line; and the size of the negative tab portion of the single battery cell close to the reference line is smaller than that of the single battery cell away from the reference line; wherein: The area where the plurality of positive tab portions overlap sequentially and the positive welding area (210) form one positive welding mark (101); and the part of the largest positive tab portion exceeding the remaining positive tab portions along the first direction and the positive welding area (210) form another positive welding mark (101). The area where the plurality of negative tab portions overlap sequentially and the negative welding area (220) form one negative welding mark (102); and the part of the largest negative tab portion exceeding the remaining negative tab portions along the first direction and the negative welding area (220) form another negative welding mark (102). The single battery cells are two, i.e. a first single battery cell (110) and a second single battery cell (120), the first single battery cell (110) has a first positive tab portion (111) and a first negative tab portion (112), and the second single battery cell (120) has a second positive tab portion (121) and a second negative tab portion (122); wherein:

3. The battery of claim 2, wherein, Along the first direction, the size of the first positive tab portion (111) is smaller than that of the second positive tab portion (121), and the size of the first negative tab portion (112) is smaller than that of the second negative tab portion (122). ​ In the second direction, the size of the first positive tab (111) is greater than the size of the second positive tab (121), and the size of the first negative tab (112) is greater than the size of the second negative tab (122).

4. The battery of claim 3, wherein, In the first direction, the size of the first positive tab (111) ranges from 10 mm to 20 mm, and in the second direction, the size of the first positive tab (111) ranges from 35 mm to 45 mm.

5. The battery of claim 3, wherein, In the first direction, the size of the first negative tab (112) ranges from 10 mm to 20 mm, and in the second direction, the size of the first negative tab (112) ranges from 35 mm to 45 mm.

6. The battery of claim 3, wherein, In the first direction, the size of the second positive tab (121) ranges from 25 mm to 35 mm, and in the second direction, the size of the second positive tab (121) ranges from 14 mm to 24 mm.

7. The battery of claim 3, wherein, In the first direction, the size of the second negative tab (122) ranges from 25 mm to 35 mm, and in the second direction, the size of the second negative tab (122) ranges from 14 mm to 24 mm.

8. The battery of claim 3, wherein, The area ratio of the first positive tab (111) to the second positive tab (121) is 1.05:1 to 1.1:1; and / or: The area ratio of the second positive tab (121) to the positive welding pad (101) is 4:1 to 6:1; and / or: The area ratio of the first negative tab (112) to the second negative tab (122) is 1.05:1 to 1.1:1; and / or: The area ratio of the second negative tab (122) to the negative welding pad (102) is 4:1 to 6:

1.

9. The battery of any one of claims 1-8, wherein, In the first direction, the size of the positive welding pad (101) ranges from 11 mm to 21 mm, and in the second direction, the size of the positive welding pad (101) ranges from 2 mm to 12 mm.

10. The battery of any one of claims 1-8, wherein, In the first direction, the size of the negative welding pad (102) ranges from 11 mm to 21 mm, and in the second direction, the size of the negative welding pad (102) ranges from 2 mm to 12 mm.

11. The battery of any one of claims 1-8, wherein, The single battery cell is a jelly-roll battery cell.

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