Battery pack structure and soft-pack battery

Abstract

The battery pack structure comprises a protection plate and two battery cells, each of the battery cells is arranged in a stack mode side by side; each of the battery cells comprises a battery cell body and a tab; the tab comprises a connecting portion and a bending portion connected with each other, the connecting portion is arranged at an end of the battery cell body; the bending portion is bent towards the direction close to the end of the battery cell body to form a mounting groove; each of the mounting grooves forms a containing cavity; the protection plate is embedded in the containing cavity and is welded with each of the bending portions. The battery pack structure can maintain the compactness of the battery pack structure, guarantee a high battery capacity, and enhance the limiting and fixing effect of the protection plate without increasing the space of the shell.

Description

Technical Field

[0001] This disclosure relates to the field of battery pack structure technology, and in particular to a battery pack structure and a pouch battery. Background Technology

[0002] When assembling a pouch battery pack, several cells are first stacked. Then, the tabs of each cell are soldered to a protection board to achieve electrical connection between the cells, meeting the voltage and capacity requirements for production. For details, please refer to [link to relevant documentation]. Figure 1 .

[0003] However, in practical applications, because the protective plate is exposed on one side of the electrode tab, please refer to [link / reference needed]. Figure 1 The exposed protective plate increases the overall height of the battery pack structure, resulting in a larger housing space for subsequent assembly. While the height of the battery pack structure could be reduced without increasing housing space, this would affect the battery capacity and shorten the lifespan of the pouch cells. Furthermore, the exposed protective plate is prone to detachment under significant external vibrations. Utility Model Content

[0004] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide a battery pack structure and pouch battery that maintains the compactness of the battery pack structure, ensures a high battery capacity, and enhances the limiting and fixing effect of the protection board without increasing the housing space.

[0005] The purpose of this disclosure is achieved through the following technical solution:

[0006] A battery pack structure includes a protection board and two battery cells.

[0007] The battery cells are stacked side by side;

[0008] Each of the aforementioned battery cells includes a battery cell body and a tab; the tab includes a connecting portion and a bending portion connected together, the connecting portion being disposed at the end of the battery cell body; the bending portion is bent toward the end of the battery cell body to form a mounting groove; each of the mounting grooves together forms a receiving cavity; the protective plate is embedded in the receiving cavity and is welded to each of the bending portions respectively.

[0009] In one embodiment, the height of the protective plate is not greater than the depth of the accommodating cavity.

[0010] In one embodiment, the bending portion includes a first bending portion, a second bending portion, and a third bending portion. The third bending portion is connected to the first bending portion via the second bending portion. The first bending portion is connected to the connecting portion. The third bending portion and the second bending portion are connected to form the mounting groove.

[0011] In one embodiment, the length of the first bend is 0% to 10% of the length of the bend; and / or,

[0012] The length of the second bend is 18% to 22% of the length of the bend; and / or,

[0013] The length of the third bend accounts for 68% to 82% of the length of the bend.

[0014] In one embodiment, the spacing between the third bends of each adjacent cell is 1 mm to 9.8 mm, and / or,

[0015] The gap between the second bent part and the protective plate is 0.0mm to 0.5mm.

[0016] In one embodiment, the included angle between the second bent portion and the connecting portion is 0°-10°; and / or,

[0017] The second bent section is parallel to the end of the battery cell body.

[0018] In one embodiment, the second bent portion is parallel to the connecting portion, and the first bent portion is an arc-shaped portion; and / or

[0019] The second bend is perpendicular to the third bend, and the second bend and the third bend are connected by an arc-shaped transition.

[0020] In one embodiment, the battery cell body includes a packaging bag, a bare battery cell, and tab adhesive. The bare battery cell is disposed within the packaging bag. The connecting portion of the tab is connected to the end of the bare battery cell and at least partially protrudes from the packaging bag. The tab adhesive is sealed at the connection between the connecting portion and the packaging bag; and / or,

[0021] The protective plate has a solder pad on the side facing the bend, and the protective plate is soldered to the bend through the solder pad.

[0022] A pouch battery includes at least one battery pack structure as described in any of the above embodiments.

[0023] In one embodiment, the top of the protective plate is located within the receiving cavity, or...

[0024] The top of the protective plate protrudes from the receiving cavity, and the height of the protective plate protruding from the receiving cavity is not greater than the assembly allowance of the soft-pack battery casing.

[0025] Compared with the prior art, this disclosure has at least the following advantages:

[0026] Because the bent portion bends towards the end of the cell body to form a mounting groove, and all the mounting grooves together form a receiving cavity, the protection plate can be embedded in the receiving cavity, effectively ensuring that the overall height of the battery pack structure does not change too much. Thus, compared with the traditional battery pack structure, the battery pack structure disclosed herein ensures that the battery pack structure has a high battery capacity without increasing the housing space. Furthermore, the formed receiving cavity can achieve better limiting and fixing of the protection plate, enabling the protection plate to withstand greater external vibration force and reducing the probability of the protection plate falling off. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this disclosure and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the assembly structure of a traditional pouch battery pack.

[0029] Figure 2 This is a schematic diagram of a battery pack structure according to an embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of the battery pack structure from another perspective according to an embodiment of the present invention;

[0031] Figure 4 for Figure 3 The enlarged view shown at point A in the middle;

[0032] Figure 5 This is a comparison diagram of the overall height of the battery pack structure of this utility model and that of a conventional battery pack structure.

[0033] Reference numerals: 10b, conventional battery pack structure; 10, battery pack structure; 100, protection board; 110, solder pad; 210, cell body; 211, encapsulation bag; 212, tab adhesive; 220, tab; 221, connection part; 222, bending part; 2221, first bending part; 2222, second bending part; 2223, third bending part; 2224, mounting groove; 300, accommodating cavity. Detailed Implementation

[0034] To facilitate understanding of this disclosure, a more complete description will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the present disclosure. However, this disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure.

[0035] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0037] To better understand the technical solutions and beneficial effects of this disclosure, the following detailed description is provided in conjunction with specific embodiments:

[0038] Please see Figures 2 to 4 In one embodiment, the battery pack structure 10 includes a protection plate 100 and two battery cells, which are stacked side by side to complete the stacking of multiple battery cells. Each battery cell includes a cell body 210 and a tab 220. The tab 220 includes a connecting portion 221 and a bending portion 222 connected to each other. The connecting portion 221 is disposed at the end of the cell body 210. The bending portion 222 is bent toward the end of the cell body 210 to form a mounting groove 2224. Each mounting groove 2224 together forms a receiving cavity 300. The protection plate 100 is embedded in the receiving cavity 300 and is welded to each of the bending portions 222.

[0039] It is understood that the bending portion 222 bends towards the end of the cell body 210 to form a mounting groove 2224; all the mounting grooves 2224 together form a receiving cavity 300; this allows the protection plate 100 to be embedded in the receiving cavity 300, effectively ensuring that the overall height of the battery pack structure 10 does not change too much. For details, please refer to [link / reference]. Figure 5Compared with the traditional battery pack structure 10b, the battery pack structure 10 disclosed herein ensures that the battery pack structure 10 has a high battery capacity without increasing the housing space; and the formed accommodating cavity 300 can achieve better limiting and fixing of the protection plate 100, so that the protection plate 100 can withstand greater external vibration force and reduce the probability of the protection plate 100 falling off.

[0040] In one embodiment, the height of the protective plate 100 is not greater than the depth of the accommodating cavity 300, so as to ensure that the protective plate 100 after welding and fixing will not protrude from the side of the tab 220; effectively avoiding the problem of increasing the overall height of the battery pack structure 10 due to the addition of the protective plate 100, so that the operator can maintain the compactness of the battery pack structure 10 and ensure a high battery capacity without increasing the housing space, while further enhancing the limiting and fixing effect of the protective plate 100.

[0041] like Figure 4 As shown, in one embodiment, the height of the protective plate 100 is equal to the depth of the accommodating cavity 300.

[0042] In one embodiment, the thickness of the tab 220 is 0.08mm to 0.2mm to ensure that the thickness of the tab 220 is suitable. This ensures that the bent portion 222 is not prone to creases or breakage after bending, while also ensuring that the bent portion 222 has high structural strength, thereby providing effective limiting and fixing for the protective plate 100. This effectively prevents the tab 220 from being unable to provide good structural support for the accommodating cavity 300 due to insufficient thickness, and also effectively avoids increasing the difficulty for the operator to bend the tab due to excessive thickness.

[0043] like Figure 4 As shown, in one embodiment, the bending portion 222 includes a first bending sub-portion 2221, a second bending sub-portion 2222, and a third bending sub-portion 2223. The third bending sub-portion 2223 is connected to the first bending sub-portion 2221 via the second bending sub-portion 2222. The first bending sub-portion 2221 is connected to the connecting portion 221. The third bending sub-portion 2223 and the second bending sub-portion 2222 are connected to form the mounting groove 2224 to ensure that the bending portion 222 can be bent downward to form the mounting groove 2224.

[0044] In one embodiment, the length of the first bending portion 2221 is 0% to 10% of the length of the bending portion 222; this ensures that the height of the first bending portion 2221 after bending is not too large, thereby effectively ensuring that the overall height of the battery pack structure 10 does not change too much, thus ensuring that the operator does not need to increase the housing space; at the same time, the reserved length of the first bending portion 2221 can better meet the needs of completing the bending operation.

[0045] In one embodiment, the length of the second bending portion 2222 is 18% to 22% of the length of the bending portion 222; this ensures that the depth of the mounting groove 2224 formed by the connection of the second bending portion 2222 and the third bending portion 2223 is appropriate, thereby ensuring that the protection plate 100 can be completely embedded in the mounting groove 2224, effectively avoiding the problem of the protection plate 100 protruding from one side of the electrode tab 220; at the same time, it also avoids the problem that the gap between the third bending portion 2223 and the cell body 210 is too small due to the excessive length of the second bending portion 2222, which would increase the safety hazard.

[0046] In one embodiment, the length of the third bend portion 2223 accounts for 68% to 82% of the length of the bend portion 222. This ensures that the third bend portion 2223 can provide relatively stable structural support for the protective plate 100, while also ensuring that adjacent third bend portions 2223 have a certain gap, for example, such as... Figure 4 As shown, in one embodiment, the spacing D1 of the third bend portion 2223 of each adjacent cell is 1mm to 9.8mm, which facilitates the operator to complete subsequent welding operations.

[0047] like Figure 4 As shown, in one embodiment, the gap D2 between the second bending portion 2222 and the protective plate 100 is 0.0mm to 0.5mm to ensure that the size of the protective plate 100 is compatible with the size of the accommodating cavity 300. In this way, while ensuring that the operator can quickly complete the assembly, the stability of the connection between the protective plate 100 and the second bending portion 2222 and the third bending portion 2223 is also guaranteed.

[0048] In one embodiment, the included angle between the second bending portion 2222 and the connecting portion 221 is 0°-10° to ensure that a small slope is formed between the second bending portion 2222 and the connecting portion 221, which facilitates the operator to assemble the protective plate 100.

[0049] In one embodiment, the second bending portion 2222 is parallel to the end of the battery cell body to ensure that the cavity 300 formed by the bending can provide more stable support for the protection plate 100.

[0050] In one embodiment, the second bending portion 2222 is parallel to the connecting portion 221, and the first bending portion is an arc-shaped portion; in particular, the second bending portion 2222 is perpendicular to the third bending portion 2223, and the second bending portion 2222 and the third bending portion 2223 are connected by an arc-shaped portion to better adapt to the plate-shaped protective plate 100, thereby achieving better limitation and fixation of the plate-shaped protective plate 100.

[0051] In one embodiment, the cell body 210 includes a packaging bag 211, a bare cell, and tab adhesive 212. The bare cell is disposed within the packaging bag 211. The connecting portion 221 of the tab 220 is connected to the end of the bare cell and at least partially protrudes from the packaging bag 211. The tab adhesive 212 is sealed at the connection between the connecting portion 221 and the packaging bag 211, thereby achieving a seal between the cell body 210 and the connecting portion 221. Since the structure of the cell body 210 is prior art, it will not be described in detail in this disclosure.

[0052] In one embodiment, the top of the packaging bag 211 forms a top sealing area, and the connecting part 221 is disposed on the top sealing area. When multiple cells are stacked side by side, the multiple top sealing areas together form a limiting cavity, so that the multiple top sealing areas can play a certain protective role for the connecting part 221, effectively avoiding the problem that the connecting part 221 is easy to fall off due to large external vibration.

[0053] like Figure 4 As shown, in one embodiment, the protective plate 100 is provided with a solder pad 110 on the side facing the bending portion 222. The protective plate 100 is welded to the bending portion 222 through the solder pad 110 to achieve welding and fixing of the protective plate 100 and the corresponding bending portion 222.

[0054] In one embodiment, the number of pads 110 corresponds to the number of tabs 220, so that the bent portion 222 can be soldered to the pads 110 one by one.

[0055] In one embodiment, tab 220 includes a positive tab and a negative tab.

[0056] This disclosure also provides a pouch cell battery, including at least one battery pack structure 10 as described in any of the above embodiments. The pouch cell battery also includes a housing, within which the battery pack structure 10 is disposed.

[0057] like Figure 3 and Figure 4As shown, in one embodiment, when the number of battery pack structures 10 is one set, that is, the two cells are the first cell and the second cell respectively, the positive and negative tabs 220 of the first cell are bent toward the end of the cell body 210 to form two first mounting grooves 2224, and similarly, the positive and negative tabs 220 of the second cell are bent toward the end of the cell body 210 to form two second mounting grooves 2224; the two first mounting grooves 2224 and the two second mounting grooves 2224 are arranged opposite to each other and together form a receiving cavity 300, which protects... The protective plate 100 has four solder pads 110 at the positions corresponding to the tabs 220. The protective plate 100 is placed in the receiving cavity 300, and the four solder pads 110 are respectively soldered to the positive and negative tabs 200 of the first and second cells, thereby realizing the embedding and fixing of the protective plate 100 with the first and second cells. In this way, the operator can complete the assembly of the battery pack structure 10 with a high battery capacity without increasing the housing space. This not only improves the connection stability of the battery pack structure 10, but also achieves better limiting and fixing of the protective plate 100.

[0058] For example, when there are two or more sets of battery pack structures 10, each set of battery pack structures 10 is stacked side by side, and each set of battery pack structures 10 is welded and fixed by conductive components to achieve the conduction function of each set of battery pack structures 10; and the multiple sets of battery pack structures 10 that are welded and fixed are placed inside the casing to ensure the preparation of a high-capacity soft-pack battery.

[0059] In one embodiment, the top of the protection plate 100 is located inside the accommodating cavity 300 to ensure that the overall height of the battery pack structure 10 does not change after the addition of the protection plate 100.

[0060] It is worth mentioning that, since the assembly of the battery pack structure 10 and the housing is generally reserved with a housing assembly allowance, in one embodiment, the top of the protection plate protrudes from the receiving cavity, and the height of the protection plate protruding from the receiving cavity is not greater than the assembly allowance value of the soft-pack battery housing. This allows the operator to design the protrusion height of the protection plate 100 according to actual assembly requirements, so that the operator can complete the assembly of the battery pack structure 10 with a higher battery capacity without increasing the housing space.

[0061] Compared with the prior art, this disclosure has at least the following advantages:

[0062] Because the bent portion 222 bends toward the end of the cell body 210 to form a mounting groove 2224; each of the mounting grooves 2224 together forms a receiving cavity 300; the protection plate 100 can be embedded in the receiving cavity 300, effectively ensuring that the overall height of the battery pack structure 10 does not change too much. Thus, compared with the traditional battery pack structure 10b, the battery pack structure 10 of this disclosure ensures that the battery pack structure 10 has a high battery capacity without increasing the housing space; and the formed receiving cavity 300 can achieve better limiting and fixing of the protection plate 100, so that the protection plate 100 can withstand greater external vibration force and reduce the probability of the protection plate 100 falling off.

[0063] The embodiments described above are merely illustrative of several implementations of this disclosure, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the disclosed patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this disclosure, and these all fall within the protection scope of this disclosure. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A battery pack structure (10), comprising a protection board (100) and two battery cells, characterized in that, The battery cells are stacked side by side; Each of the battery cells includes a battery cell body (210) and a tab (220); the tab (220) includes a connecting portion (221) and a bending portion (222) connected to each other, the connecting portion (221) being disposed at the end of the battery cell body (210); the bending portion (222) is bent toward the end of the battery cell body (210) to form a mounting groove (2224); each of the mounting grooves (2224) together forms a receiving cavity (300); the protective plate (100) is embedded in the receiving cavity (300) and is welded to each of the bending portions (222).

2. The battery pack structure (10) according to claim 1, characterized in that, The height of the protective plate (100) is not greater than the depth of the accommodating cavity (300).

3. The battery pack structure (10) according to claim 1, characterized in that, The bending portion (222) includes a first bending sub-portion (2221), a second bending sub-portion (2222), and a third bending sub-portion (2223). The third bending sub-portion (2223) is connected to the first bending sub-portion (2221) through the second bending sub-portion (2222). The first bending sub-portion (2221) is connected to the connecting portion (221). The third bending sub-portion (2223) and the second bending sub-portion (2222) are connected to form the mounting groove (2224).

4. The battery pack structure (10) according to claim 3, characterized in that, The length of the first bent portion (2221) accounts for 0% to 10% of the length of the bent portion (222); and / or, The length of the second bend (2222) accounts for 18% to 22% of the length of the bend (222); and / or, The length of the third bending sub-section (2223) accounts for 68% to 82% of the length of the bending section (222).

5. The battery pack structure (10) according to claim 3, characterized in that, The spacing between the third bends (2223) of adjacent cells is 1 mm to 9.8 mm, and / or, The gap between the second bent part (2222) and the protective plate (100) is 0.0mm to 0.5mm.

6. The battery pack structure (10) according to claim 3, characterized in that, The included angle between the second bent portion (2222) and the connecting portion (221) is 0°-10°; and / or, The second bent portion (2222) is parallel to the end of the cell body (210).

7. The battery pack structure (10) according to claim 3, characterized in that, The second bent portion (2222) is parallel to the connecting portion (221), and the first bent portion (2221) is an arc-shaped portion; and / or, The second bend (2222) is perpendicular to the third bend (2223), and the second bend (2222) and the third bend (2223) are connected by an arc-shaped transition.

8. The battery pack structure (10) according to claim 1, characterized in that, The battery cell body (210) includes a packaging bag (211), a bare battery cell, and tab adhesive (212). The bare battery cell is disposed inside the packaging bag (211). The connecting portion (221) of the tab (220) is connected to the current collector of the bare battery cell and partially protrudes from the top sealing edge of the packaging bag (211). The tab adhesive (212) is sealed at the connection between the connecting portion (221) and the packaging bag (211); and / or, The protective plate (100) has a solder pad (110) on the side facing the bent portion (222), and the protective plate (100) is soldered to the bent portion (222) through the solder pad (110).

9. A soft-pack battery, characterized in that, It includes at least one set of battery pack structures (10) according to any one of claims 1-8.

10. The soft-pack battery according to claim 9, characterized in that, The top of the protective plate (100) is located within the accommodating cavity (300), or, The top of the protection plate (100) protrudes from the receiving cavity (300), and the height of the protection plate (100) protruding from the receiving cavity (300) is not greater than the assembly allowance of the soft-pack battery casing.

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