Protective structure and battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a protective structure and a battery, the protective structure is connected with a battery cell group, the battery cell group comprises at least two battery cells, a connecting gap is arranged between two adjacent battery cells, the protective structure comprises side plates and an insulating film, the side plates are connected with the battery cell group, the side plates comprise a first plate and a second plate, and the insulating film is arranged between the first plate and the second plate. The number of the first plates is two, the two first plates extend in the first direction, the two first plates are arranged on the two sides of the battery cell group respectively and are connected with the battery cell group, and the second plates are connected with the first plates and are arranged in the connecting gaps; and the insulating film wraps the battery cell group. Therefore, the first plate can improve the structural strength of the battery cells in the first direction and avoid bending deformation of the battery cells, and the second plate arranged in the connection gap can enhance the connection strength between the two battery cells, so that the width of the connection gap is kept unchanged, the assembly difficulty of the battery cells is reduced, and the stability and safety of the battery cells are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a protective structure and a battery. Background Art

[0002] A battery is a device that converts chemical energy into electrical energy. It generates current through internal chemical reactions. Lithium-ion batteries, as a commonly used battery, have the characteristics of high energy density, long service life and low self-discharge rate. With the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields.

[0003] A lithium-ion battery includes an electrode group and a shell. The electrode group is arranged in the shell and combined to form a battery cell. The electrode group includes a pole ear for transmitting current to the outside.

[0004] The design requirements of lithium-ion batteries are diverse. When multiple battery cells need to be assembled in series, due to the low strength of the electrode group, the longer electrode group is prone to bending and deformation, resulting in a decrease in yield. The electrode group is weakly supported during assembly and movement, and when thermal runaway occurs in the longer battery cell, the gas cannot be released quickly due to the long path and poor flow, and it is easy to be damaged. Therefore, the molding process requirements for longer battery cells are high, and the support is difficult, so the existing battery cell structure is generally short in length, and the overall capacity increase space is limited by process conditions; in addition, connecting multiple battery cells in series will increase structural costs and waste space. When multiple battery cells are connected in series through tabs, the tabs require more space for good welding. There is a risk of overlapping of the bent tabs, and the safety performance of multiple battery cells connected in series is poor. Utility Model Content

[0005] The purpose of the utility model is to provide a protective structure and a battery to solve the problems of high difficulty in assembling longer battery cells and poor stability and safety.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] On the one hand, a protective structure is connected to a battery cell group, the battery cell group includes at least two battery cells, and a connection gap is provided between two adjacent battery cells so that the two adjacent battery cells are spaced apart. The protective structure includes: a side plate, the side plate is connected to the battery cell group, the side plate includes a first plate and a second plate, two first plates are provided, and both of the two first plates extend along the first direction, the first plates are respectively provided on both sides of the battery cell group and connected to the battery cell group, the second plate is connected to the first plate, and the second plate is provided in the connection gap; an insulating film, the insulating film covers the battery cell group.

[0008] Preferably, at least one of the first plates is provided with exhaust holes corresponding to the connection gaps, and the second plate connected to the first plate is provided with exhaust grooves communicating with the exhaust holes.

[0009] Preferably, the insulating film wraps the side plates, and a plurality of exhaust slits are provided at positions corresponding to the exhaust holes of the insulating film. The plurality of exhaust slits enclose an exhaust area, and the projection of the exhaust hole in the second direction is located within the projection of the exhaust area in the second direction; the first direction is perpendicular to the second direction.

[0010] Preferably, the first plate includes a reinforcing portion and a connecting portion. The reinforcing portion and the connecting portion are arranged alternately along the first direction to form the first plate, and the width of the reinforcing portion is greater than the width of the connecting portion.

[0011] Preferably, the second plate is connected to the reinforcing portion of the first plate, and the length direction of the second plate is parallel to the second direction.

[0012] Preferably, the thickness of the first plate is T, and the thickness dimension is 0.5 mm < T < 3 mm; and / or, the length of the second plate in the first direction is W, and the length dimension is 6 mm < W < 15 mm.

[0013] Preferably, the protection structure further includes a support plate disposed at both ends of the battery cell group.

[0014] On the other hand, a battery includes a battery cell group, a housing, and the protection structure as described above. The battery cell group is disposed in the housing. The battery cell group includes a plurality of battery cells. Battery tabs are respectively connected to both ends of the battery cells. The battery tabs at one end where adjacent two battery cells are close to each other are electrically connected. The two second plates in the connection gap are respectively disposed on both sides of the battery tabs.

[0015] Preferably, the protection structure further includes a support plate disposed at both ends of the battery cell group. The support plate is provided with a limiting groove for the battery tabs to pass through.

[0016] Preferably, at least one of the first plates is provided with an exhaust hole. The connection gap communicates with the interior of the housing through the exhaust hole. An explosion-proof valve is provided on the housing, and the explosion-proof valve is disposed corresponding to the exhaust hole.

[0017] The beneficial effects of the present utility model:

[0018] A protective structure is connected to a battery cell group, the battery cell group includes at least two battery cells, and a connection gap is provided between two adjacent battery cells so that the two adjacent battery cells are arranged at intervals. The protective structure includes a side plate and an insulating film. The side plate is connected to the battery cell group, and the side plate includes a first plate and a second plate. Two first plates are provided, and the two first plates extend along a first direction. The two first plates are respectively arranged on both sides of the battery cell group and connected to the battery cell group, and the second plate is connected to the first plate and is arranged in the connection gap; the insulating film is arranged to cover the battery cell group.

[0019] In this way, the first plate is connected to the battery cell, which can improve the structural strength of the battery cell group in the first direction and avoid bending and deformation on both sides of the battery cell; the second plate is arranged in the connection gap, which can enhance the connection strength between the two battery cells, so that the battery cell group can maintain the width of the connection gap unchanged during assembly, and the second plate can provide stable support for the two adjacent battery cells, avoiding overlap of the pole ears in the connection gap and causing a short circuit, and the insulating film can insulate and protect the battery cell, improve the stability and safety of the battery cell, and under the limiting effect of the side plate, the difficulty of assembling the battery cell can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of a protective structure in one embodiment of the present utility model;

[0021] Figure 2 This is a schematic diagram of the partial structure of the side panel in one embodiment of the present utility model;

[0022] Figure 3 It is a partial front view of a side panel in one embodiment of the present utility model;

[0023] Figure 4 is a top view of a battery in one embodiment of the present utility model;

[0024] Figure 5 In one embodiment of the present utility model Figure 4 AA section view;

[0025] Figure 6 In one embodiment of the present invention Figure 5 Enlarged view of point C;

[0026] Figure 7 In one embodiment of the present utility model Figure 4 BB cross-sectional view;

[0027] Figure 8 It is a cross-sectional view of a battery in one embodiment of the present invention.

[0028] In the picture:

[0029] 1. Side panel; 11. First panel; 111. Exhaust hole; 112. Reinforcement portion; 113. Connecting portion; 12. Second panel; 121. Exhaust groove; 2. Insulation film; 21. Exhaust notch; 22. Exhaust area; 3. Support panel; 31. Limiting groove; 4. Battery cell; 41. Tab; 5. Connection gap; 6. Housing; 61. Explosion-proof valve; X, first direction; Y, second direction. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0031] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0032] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0033] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0034] See Figure 1The utility model provides a protective structure connected to a battery cell group, the battery cell group includes at least two battery cells 4, and a connection gap 5 is provided between two adjacent battery cells 4 so that the two adjacent battery cells 4 are spaced apart. The protective structure includes a side plate 1 and an insulating film 2. The side plate 1 is connected to the battery cell group. The side plate 1 includes a first plate 11 and a second plate 12. Two first plates 11 are provided, and the two first plates 11 extend along the first direction X. The two first plates 11 are respectively arranged on both sides of the battery cell group and connected to the battery cell group. The second plate 12 is connected to the first plate 11, and the second plate 12 is arranged in the connection gap 5; the insulating film 2 is arranged to cover the battery cell group.

[0035] In this embodiment, the battery cell group includes two battery cells 4, and the two battery cells 4 are spaced apart along the first direction X. The first plate 11 is symmetrically arranged on both sides of the second plate 12, and the first plate 11 is connected to the side walls of the battery cells 4. The second plate 12 and the first plate 11 are integrally formed by an injection molding process. The first direction X is parallel to the length direction of the battery cells 4; the length of the second plate 12 in the first direction X is equal to the width of the connection gap 5, that is, the second plate 12 is respectively abutted against the side walls of the two battery cells 4 that are close to each other.

[0036] In this way, the first plate 11 can improve the structural strength of the battery cell group in the first direction X. The first plates 11 are respectively arranged on both sides of the battery cell 4, and can limit the two sides of the battery cell 4 to prevent the longer battery cell 4 from bending and deformation; the second plate 12 arranged in the connection gap 5 can enhance the connection strength between the two battery cells 4, so that when the battery cell group is assembled into the inside of the shell 6, the two battery cells 4 can maintain the width of the connection gap 5 unchanged under the restriction of the second plate 12, so that the tabs 41 between the battery cells 4 are not easy to overlap, reducing the risk of short circuit, and the insulating film 2 can insulate and protect the battery cells 4, improve the stability and safety of multiple longer battery cells 4, and by connecting the side plate 1 to the battery cell group, it is convenient to stably connect the two battery cells 4, reducing the difficulty of assembling the longer battery cell 4.

[0037] It can be understood that the first plate 11 can also be detachably connected to the second plate 12 so that the first plate 11 and the second plate 12 of different specifications can be replaced according to the battery cells 4 of different specifications. In this embodiment, the first plate 11 and the second plate 12 are integrally formed, which can improve the structural strength of the side panel 1 while reducing the number of parts and simplifying the assembly process.

[0038] See Figure 1 and Figure 2 In some embodiments, at least one first plate 11 is provided with an exhaust hole 111 at a position corresponding to the connection gap 5 , and a second plate 12 connected to the first plate 11 is provided with an exhaust groove 121 communicating with the exhaust hole 111 .

[0039] Each of the two first plates 11 is provided with an exhaust hole 111 . The two exhaust holes 111 are respectively provided at both ends of the connection gap 5 . The length direction of the exhaust slot 121 is parallel to the length direction of the second plate 12 .

[0040] In this way, the connection gap 5 can be connected to the outside world through the exhaust groove 121 and the exhaust hole 111, so that the high-pressure gas generated when the battery cell 4 is out of control can be quickly discharged to the outside world, avoiding the long gas flow path due to the long length of the battery cell 4, and improving the stability and safety of the longer battery cell 4.

[0041] It is understandable that a plurality of exhaust holes 111 may also be provided on the first plate 11 to facilitate gas circulation. In this embodiment, one exhaust hole 111 is provided on the first plate 11 for the purpose of directional gas discharge. The specific location and number of the exhaust holes 111 can be adjusted according to actual needs and are not listed in detail here.

[0042] See Figure 1 In some embodiments, the insulating film 2 is provided to cover the side plate 1, and a plurality of exhaust grooves 21 are opened on the insulating film 2 at positions corresponding to the exhaust holes 111. The plurality of exhaust grooves 21 are arranged at intervals, and the plurality of exhaust grooves 21 are arranged to form an exhaust area 22. The projection of the exhaust hole 111 in the second direction Y is located within the projection of the exhaust area 22 in the second direction Y. The first direction X is perpendicular to the second direction Y.

[0043] In this embodiment, the insulating film 2 is a malar film, and the insulating film 2 is arranged on the side of the side plate 1 away from the battery cell 4, that is, the insulating film 2 covers the side plate 1 and the battery cell group; the exhaust area 22 surrounded by multiple exhaust grooves 21 is runway-shaped, and the cross-sectional area of ​​the exhaust area 22 is larger than the cross-sectional area of ​​the exhaust hole 111; the second direction Y is the height direction of the battery cell 4.

[0044] In this way, when the pressure of the gas discharged through the exhaust hole 111 is high, the gas can impact the exhaust area 22 and discharge the gas through the exhaust groove 21 or cause the insulating film 2 to rupture at the exhaust area 22 to achieve rapid exhaust, so that the insulating film 2 can be well covered with the side plate 1 and the battery cell group while being easy to exhaust, thereby improving the stability and safety of the longer battery cell 4.

[0045] It is understandable that the shape of the exhaust area 22 of the exhaust slot 21 can also be square, circular, etc., and is not limited to a runway shape. It can be flexibly adjusted according to actual needs and will not be elaborated here.

[0046] See Figure 1 and Figure 2In some embodiments, the first plate 11 includes a reinforcing portion 112 and a connecting portion 113. The reinforcing portions 112 and the connecting portion 113 are staggered along the first direction X to form the first plate 11. The width of the reinforcing portion 112 is greater than the width of the connecting portion 113. In this embodiment, the width of the reinforcing portion 112 is less than the thickness of the battery cell 4, and the reinforcing portion 112 and the connecting portion 113 are integrally formed.

[0047] In this way, the reinforcing portion 112 and the connecting portion 113 are staggered, which not only increases the structural strength of the first plate 11, and thus enhances the structural strength of the battery cell 4 in the first direction X, but also because the width of the connecting portion 113 is smaller than the width of the reinforcing portion 112, a channel that facilitates gas flow can be formed, so that the gas can be quickly discharged to the outside through the exhaust hole 111, thereby improving the safety performance of the longer battery cell 4.

[0048] It is understandable that the first plate 11 can also be a plate-shaped structure with uniform width, as long as it can support the side walls of the battery cell 4. The shape and size of the first plate 11 can be flexibly adjusted according to actual needs, and no further examples are given here.

[0049] See Figure 2 In some embodiments, the second plate 12 is connected to the reinforcement portion 112 of the first plate 11, and the length direction of the second plate 12 is parallel to the second direction Y. In this embodiment, the connecting line between the center of the second plate 12 and the center of the first plate 11 is parallel to the first direction X, and the first plate 11 is symmetrically arranged with respect to the axis of the second plate 12 in the length direction.

[0050] In this way, the connection between the second plate 12 and the reinforcing part 112 can strengthen the connection strength between the second plate 12 and the first plate 11, so that the second plate 12 is stably set in the connection gap 5 and provides support for two adjacent battery cells 4, avoiding the second plate 12 from shaking and offsetting in the connection gap 5, and reducing the difficulty of assembling the battery cells 4.

[0051] It is understandable that the distances between the two ends of the first plate 11 and the second plate 12 may be different, that is, the first plate 11 may be asymmetrically arranged relative to the axis of the second plate 12 in the longitudinal direction, which will not be listed in detail here.

[0052] See Figure 1-Figure 3, in some embodiments, the thickness of the first plate 11 is T, and the thickness dimension is 0.5 mm < T < 3 mm; the length of the second plate 12 in the first direction X is W, and the length dimension is 6 mm < W < 15 mm. Exemplarily, the thickness T of the first plate 11 can be 0.6 mm, 0.7 mm, 1 mm, 1.5 mm, 2 mm, 2.8 mm, 2.9 mm, and the length W of the second plate 12 in the first direction X can be 7 mm, 8 mm, 10 mm, 12 mm, 14 mm. In this embodiment, the width of the connection gap 5 (that is, the interval width between the two battery cells 4) is equal to the length of the second plate 12 in the first direction X.

[0053] Thus, the first plate 11 can stably support the battery cell 4 to enhance the structural strength of the battery cell 4 in the first direction X. The second plate 12 is arranged between the connection gaps 5, which is convenient for the staff to quickly arrange the two battery cells 4 at intervals after assembling the side plate 1 onto the battery cell 4, so as to provide a connection space for the ear tabs 41 in the brackets of the two battery cells 4, enabling the adjacent two battery cells 4 to be stably electrically connected, and avoiding the risk of short circuit caused by the overlapping of the ear tabs 41 due to the movement between the two battery cells 4, improving the safety performance of the longer battery cell 4 and reducing the assembly difficulty.

[0054] It can be understood that the thickness of the first plate 11 and the length of the second plate 12 in the first direction X can be adjusted according to actual needs, which will not be elaborated here.

[0055] Refer to Figure 1 , in some embodiments, the protection structure further includes a support plate 3, and the support plate 3 is arranged at both ends of the battery cell group. Among them, there are two support plates 3, and the two support plates 3 are respectively detachably connected to the ends of the two battery cells 4, and the length direction of the support plate 3 is parallel to the second direction Y.

[0056] Thus, the support plate 3 can improve the structural strength of the end of the battery cell 4, making the force on the end of the battery cell 4 more uniform when the staff pushes the battery cell 4 into the housing 6, and reducing the assembly difficulty.

[0057] It can be understood that the support plate 3 can be arranged at both ends of the battery cell 4, or only at the end where the battery cell 4 is pushed into the housing 6, as long as it can enhance the structural strength of the end of the battery cell 4.

[0058] Refer to Figure 4-Figure 7 , the present utility model provides a battery, including a battery cell group, a housing 6 and a protection structure. The battery cell group is arranged in the housing 6. The battery cell group includes multiple battery cells 4. Ear tabs 41 are respectively connected to both ends of the battery cell 4, and the ear tabs 41 at the mutually close ends of the adjacent two battery cells 4 are electrically connected. The two second plates 12 in the connection gap 5 are respectively arranged on both sides of the ear tabs 41.

[0059] In this embodiment, refer to Figure 8The tabs 41 at one end of the two battery cells 4 that are close to each other are horizontally welded, and the tabs 41 at one end of the two battery cells 4 that are close to each other have opposite electrical properties.

[0060] In this way, by welding the tabs 41 to connect the two battery cells 4, not only can the assembly process be simplified and the internal resistance be further reduced, but the length of the tabs 41 can be saved, the space occupied by the battery cell 4 as a whole can be reduced, and the length of the battery cell 4 can be reduced, thereby avoiding defects such as wrinkles, deformation, layer crossover, and fracture caused by excessive length of the battery cell 4, thereby reducing the difficulty of assembly; the side panel 1 is connected to both battery cells 4, which facilitates the installation and disassembly of the battery cell group, protects the connection between the tabs 41 between the two battery cells 4, and improves the stability and safety of the battery cell 4.

[0061] See Figure 1 In some embodiments, the protective structure further includes support plates 3, which are disposed at both ends of the battery cell group and have retaining grooves 31 for the tabs 41 to pass through. In this embodiment, the two support plates 3 are respectively fixedly connected to the ends of the two battery cells 4 that are away from each other.

[0062] In this way, the limiting groove 31 can limit the tab 41 , making it difficult for the tab 41 to deviate and overlap during the assembly process, avoiding the tab 41 overlapping and causing a short circuit, thereby improving the safety of the battery cell 4 .

[0063] It can be understood that the support plate 3 can be fixed to the battery cell 4 by means of adhesion, hot melting, etc., and can also be detachably connected to the battery cell 4. The specific connection method between the support plate 3 and the battery cell 4 can be flexibly adjusted to enable the support plate 3 to stably support the end of the battery cell 4.

[0064] See Figure 7 In some embodiments, at least one first plate 11 is provided with an exhaust hole 111 , and the connecting gap 5 is connected to the interior of the shell 6 through the exhaust hole 111 . An explosion-proof valve 61 is provided on the shell 6 , and the explosion-proof valve 61 is arranged at a position corresponding to the exhaust hole 111 .

[0065] In this way, the high-pressure gas generated when the battery cell 4 is out of control is output to the explosion-proof valve 61 through the exhaust hole 111, which can enable the gas inside the shell 6 to be quickly discharged to the outside, avoiding the gas from dispersing and flowing inside the shell 6, resulting in the gas pressure at the explosion-proof valve 61 not reaching the bursting pressure in time, so that the gas can be quickly discharged when the battery cell group is long, thereby improving the stability and safety of the battery cell 4.

[0066] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A protective structure, characterized in that: Connected to the battery cell group, the battery cell group includes at least two battery cells (4), and a connection gap (5) is provided between two adjacent battery cells (4) to arrange the two adjacent battery cells (4) at intervals. The protection structure includes: Side plates (1), the side plates (1) are connected to the battery cell group. The side plates (1) include a first plate (11) and a second plate (12). There are two first plates (11), and both of the two first plates (11) extend along a first direction (X). The two first plates (11) are respectively arranged on both sides of the battery cell group and connected to the battery cell group. The second plate (12) is connected to the first plate (11), and the second plate (12) is arranged in the connection gap (5); Insulating film (2), the insulating film (2) is wrapped around the battery cell group.

2. The protective structure according to claim 1, characterized in that: At least one of the first plates (11) is provided with an exhaust hole (111) at a position corresponding to the connection gap (5), and the second plate (12) connected to the first plate (11) is provided with an exhaust groove (121) communicated with the exhaust hole (111).

3. The protective structure according to claim 2, characterized in that: The insulating film (2) is wrapped around the side plates (1). The insulating film (2) is provided with a plurality of exhaust cut grooves (21) at a position corresponding to the exhaust hole (111). The plurality of exhaust cut grooves (21) enclose an exhaust area (22). The projection of the exhaust hole (111) in a second direction (Y) is located within the projection of the exhaust area (22) in the second direction (Y); the first direction (X) is perpendicular to the second direction (Y).

4. The protective structure according to claim 1, characterized in that: The first plate (11) includes a reinforcing portion (112) and a connecting portion (113). The reinforcing portion (112) and the connecting portion (113) are arranged alternately along the first direction (X) to form the first plate (11), and the width of the reinforcing portion (112) is greater than the width of the connecting portion (113).

5. The protective structure according to claim 4, characterized in that: The second plate (12) is connected to the reinforcing portion (112) of the first plate (11), and the length direction of the second plate (12) is parallel to the second direction (Y).

6. The protective structure according to any one of claims 1 to 5, characterized in that: The thickness of the first plate (11) is T, and 0.5mm < T < 3mm; and / or, the length of the second plate (12) in the first direction (X) is W, and 6mm < W < 15mm.

7. The protective structure according to any one of claims 1 to 5, characterized in that: The protection structure further includes a support plate (3), and the support plate (3) is arranged at both ends of the battery cell group.

8. A battery, characterized in that: Including a battery cell group, a housing (6) and the protection structure according to any one of claims 1-7. The battery cell group is arranged in the housing (6). The battery cell group includes a plurality of battery cells (4). Ear tabs (41) are respectively connected to both ends of the battery cells (4). The ear tabs (41) at one end of two adjacent battery cells (4) close to each other are electrically connected. The two second plates (12) in the connection gap (5) are respectively arranged on both sides of the ear tabs (41).

9. The battery according to claim 8, characterized in that The protective structure further comprises a support plate (3), the support plate (3) being arranged at both ends of the battery cell group, and the support plate (3) being provided with a limiting groove (31) for the tab (41) to pass through.

10. The battery according to claim 8, characterized in that At least one of the first plates (11) is provided with an exhaust hole (111), the connection gap (5) is communicated with the interior of the shell (6) through the exhaust hole (111), and an explosion-proof valve (61) is provided on the shell (6), and the explosion-proof valve (61) is arranged at a position corresponding to the exhaust hole (111).

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