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, the battery cells are arranged along a first direction and are connected in series, the protective structure comprises a fixed support and a protective assembly, the fixed support comprises a side plate and an end plate, the side plates are arranged on the side walls, parallel to the first direction, of the battery cell group, and the two end plates are arranged at the two ends of the battery cell group respectively; the protection assembly comprises a protection cover, the protection cover is connected with the side plate, and a first space is formed in the protection cover and is used for accommodating tabs of two adjacent battery cells. Therefore, the plurality of battery cells are connected in series by welding the tabs, so that the space can be saved, the internal resistance is reduced, and the space utilization rate of the battery cells is improved; the protective cover can protect the tabs in the first space, so that the tabs are prevented from being bent or damaged when the battery cell is assembled, and the safety performance of the long battery is 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. Lithium batteries, as power batteries, are widely used in electric vehicles and energy storage fields.

[0003] A lithium 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 electrode tabs, which are usually arranged at both ends of the battery cell.

[0004] Due to the different power requirements of different products, for application scenarios that require the battery length to be designed to be longer, the existing battery cell structure is generally shorter, and the overall capacity increase space is limited by the process. Connecting multiple battery cells in series will increase the structural cost and waste space, and the bending of the tabs during assembly is prone to overlap and cause short circuits, and take up more space; if the battery cell length is designed to be longer, not only will the molding process requirements be high, but due to the weak strength of the pole group, defects such as bending and deformation may occur during assembly and use, causing damage to the pole group and reducing the yield. When the battery cell experiences thermal runaway, the gas generated by the battery cell has a long and poor flow path in the battery, making it difficult to quickly release it to the outside through the explosion-proof valve, posing a safety hazard. 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 assembly difficulty and poor safety performance of long batteries.

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

[0007] In the first aspect, a protective structure is connected to a battery cell group, the battery cell group includes at least two battery cells, the battery cells are arranged along a first direction and connected in series, the protective structure includes: a fixed bracket, the fixed bracket includes a side plate and an end plate, the side plate is arranged on the side wall of the battery cell group parallel to the first direction, there are two end plates, and the two end plates are respectively arranged at both ends of the battery cell group; the protective component, the protective component includes a protective cover, the protective cover is connected to the side plate, and a first space is formed inside the protective cover for accommodating the tabs of two adjacent battery cells.

[0008] Preferably, two side panels are provided, and the two side panels are respectively arranged on both sides of the battery cell group and connected to the battery cell group. The fixed bracket also includes a connecting plate, which is arranged between two adjacent battery cells. The two ends of the connecting plate are respectively connected to the side walls of the two side panels close to each other, and the protective cover is connected to the connecting plate.

[0009] Preferably, the protective cover includes two rotating plates, at least one of the two rotating plates can rotate toward or away from the other rotating plate, so that when the two rotating plates are covered, the first space is formed between the two rotating plates.

[0010] Preferably, the protection assembly further includes two limit plates, the two limit plates are arranged on the connecting plate, and the two ends of the rotating plate are rotatably connected to the two limit plates respectively.

[0011] Preferably, the thickness of the connecting plate is in the range of 0.8 mm to 2 mm; and / or the thickness of the limiting plate is in the range of 1 mm to 4 mm.

[0012] Preferably, a support block is connected to the side wall of at least one of the rotating plates facing the other rotating plate, and when the two rotating plates are covered, a second space is formed on one side of the support block, and the second space is connected to the first space.

[0013] In a second aspect, a battery comprises a cover plate, a shell, a cell group and the protective structure as described above, wherein two cover plates are provided, and the two cover plates are respectively arranged on the side of the two end plates away from the cell group, and the shell is connected to the cell group and the cover plates.

[0014] Preferably, one of the two adjacent battery cells is provided with an escape groove, and the protective cover is arranged in the escape groove.

[0015] Preferably, the width of the avoidance groove ranges from 5mm to 10mm.

[0016] Preferably, the battery further comprises an explosion-proof valve, which is arranged on the cover plate; and / or the explosion-proof valve is arranged at a position on the housing corresponding to the protective cover.

[0017] Beneficial effects of the utility model:

[0018] A protective structure is connected to a battery cell group, which includes at least two battery cells, which are arranged along a first direction and connected in series. The protective structure includes a fixed bracket and a protective component, the fixed bracket includes a side plate and an end plate, the side plate is arranged on the side wall of the battery cell group parallel to the first direction, and two end plates are provided, and the two end plates are respectively arranged at both ends of the battery cell group; the protective component includes a protective cover, which is connected to the side plate, and a first space is formed inside the protective cover for accommodating the tabs of two adjacent battery cells.

[0019] In this way, the battery cells are connected in series by welding the tabs, which can extend the total length of the battery without increasing the length of the battery cell body, avoiding defects such as bending and deformation during assembly and use due to the excessive length of the battery cell, and reducing the internal resistance, simplifying the process, improving the space utilization of the battery cell, and reducing the difficulty of assembling long batteries; the protective cover can protect the tabs located in the first space, preventing the tabs from bending or breaking during assembly, thereby causing hidden dangers such as short circuits, and improving the safety performance of long batteries. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0021] Figure 2 In one embodiment of the present utility model Figure 1 A magnified view of point A;

[0022] Figure 3 This is a partial front view of a protective structure in one embodiment of the present utility model;

[0023] Figure 4 This is a schematic structural diagram of a rotating plate in one embodiment of the present utility model;

[0024] Figure 5 This is a schematic diagram of the partial structure of the protective structure in one embodiment of the present utility model;

[0025] Figure 6 In one embodiment of the present utility model Figure 5 Enlarged view of point B;

[0026] Figure 7 In one embodiment of the present utility model Figure 5 Enlarged view of point C;

[0027] Figure 8 This is a schematic diagram of the partial structure of the protective structure in one embodiment of the present utility model;

[0028] Figure 9 This is a schematic diagram of the partial structure of a battery in one embodiment of the present utility model;

[0029] Figure 10 This is an exploded view of a battery in one embodiment of the present utility model;

[0030] Figure 11 is a top view of an insulating film in one embodiment of the present utility model;

[0031] Figure 12 It is a front view of one of the battery cells in one embodiment of the present invention.

[0032] In the picture:

[0033] 1. Fixed bracket; 11. Side panel; 111. First part; 112. Second part; 12. End plate; 121. Mounting slot; 13. Connecting plate; 2. Protective assembly; 21. Protective cover; 211. First space; 212. Rotating plate; 2121. Rotating shaft; 213. Second space; 214. Support block; 22. Limiting plate; 221. Limiting slot; 3. Insulating film; 31. Exhaust slot; 4. Battery cell; 41. Tab; 42. Avoidance slot; 5. Cover plate; 6. Shell; 7. Explosion-proof valve; X, first direction. DETAILED DESCRIPTION

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] See Figures 1 to 7The present invention provides a protective structure connected to a battery pack, wherein the battery pack includes at least two battery cells 4 (see Figure 9 ), the battery cells 4 are arranged along a first direction X and connected in series, the protective structure includes a fixed bracket 1 and a protective component 2, the fixed bracket 1 includes a side plate 11 and an end plate 12, the side plate 11 is arranged on the side wall of the battery cell group parallel to the first direction X, there are two end plates 12, and the two end plates 12 are respectively arranged at both ends of the battery cell group; the protective component 2 includes a protective cover 21, the protective cover 21 is connected to the side plate 11, and a first space 211 is formed inside the protective cover 21 for accommodating the pole ears 41 of two adjacent battery cells 4.

[0039] In this embodiment, the battery cell group includes two battery cells 4, the first direction X is parallel to the length direction of the battery cell 4, and pole ears 41 with opposite electrical properties are respectively provided at both ends of the battery cell 4. The pole ears 41 of two adjacent battery cells 4 close to each other are fixedly connected by welding so that the battery cells 4 are connected in series; the end plate 12 is fixedly connected to the side plate 11 and the end of the battery cell group, the length direction of the first space 211 is perpendicular to the first direction X, and the length of the first space 211 is not less than the length of the pole ear 41, so that the pole ear 41 between the two adjacent battery cells 4 is located in the first space 211.

[0040] In this way, multiple battery cells 4 are connected in series by welding the tabs 41, which can increase the overall length of the battery while making the length of a single battery cell 4 moderate, avoiding defects such as wrinkles, deformation, layer crosstalk, and breakage during assembly and use due to the excessive length of the battery cell 4. It can also simplify the process, reduce internal resistance, save the length of the tabs 41, and improve the space utilization of the battery cell 4; since the connection strength of the tabs 41 at the welding point is relatively low, the protective cover 21 can provide protection for the tabs 41 located in the first space 211, avoiding the tabs 41 from bending or breaking when the battery cell 4 is assembled, thereby causing safety hazards such as short circuits, improving the safety performance of long batteries, and reducing assembly difficulty.

[0041] It can be understood that the number of battery cells 4 in the battery cell group can be flexibly adjusted according to actual needs, so that a protective cover 21 is provided between adjacent battery cells 4. This embodiment does not limit this; the end plate 12 and the battery cell 4 can be fixedly connected by gluing, hot melting, etc., and the fixing method of the end plate 12 and the battery cell 4, and the side plate 11 and the battery cell 4 can be flexibly adjusted.

[0042] See Figure 8 and Figure 9 In some embodiments, two side panels 11 are provided. The two side panels 11 are respectively provided on both sides of the battery cell group and connected to the battery cell group. The fixing bracket 1 further includes a connecting plate 13. The connecting plate 13 is provided between two adjacent battery cells 4 (see Figure 9 ), the two ends of the connecting plate 13 are respectively connected to the side walls of the two side plates 11 close to each other, and the protective cover 21 is connected to the connecting plate 13.

[0043] Among them, the length direction of the side panel 11 is parallel to the first direction X, the side panel 11 includes a first part 111 and a second part 112, the width of the first part 111 is greater than the width of the second part 112, one side panel 11 includes a first part 111 and two second parts 112, the two second parts 112 are respectively fixedly connected to the two ends of the first part 111, and the two ends of the connecting plate 13 are respectively fixedly connected to the two first parts 111, and a groove for the pole ear 41 to pass through is opened on the connecting plate 13 (not shown in the figure).

[0044] Furthermore, the side panels 11 , the end panels 12 , and the connecting panels 13 are integrally formed by an injection molding process.

[0045] In this way, the protective cover 21 is set on the connecting plate 13, which can limit the position of the protective cover 21, so that the protective cover 21 can stably protect the pole ear 41, and the connecting plate 13 can improve the structural strength of the fixing bracket 1, which is convenient for protecting the battery cells 4 when multiple battery cells 4 are pushed into the shell 6, avoiding deformation and bending of the battery cells 4 when entering the shell, and the one-piece fixed bracket 1 is convenient for assembly. After the fixing bracket 1 is assembled to the battery cell 4, the assembly efficiency of the battery cell 4 and the shell 6 is reduced; the connecting plate 13 is connected to the first part 111 with a larger width, which can enhance the structural strength of the connection, and the width of the second part 112 is smaller than the width of the first part 111, which can create a gap between the side plate 11 and the shell 6 of the battery, forming a ring channel flow inside the battery, improving the exhaust efficiency when the battery cell 4 is out of control, and improving the safety performance of the long battery.

[0046] It can be understood that the end plate 12 and the connecting plate 13 can also be detachably connected to the side plate 11. In this embodiment, the end plate 12, the connecting plate 13, and the side plate 11 are formed as one piece in order to improve the structural strength. The connection method between the end plate 12 and the connecting plate 13 and the side plate 11 is not limited to a fixed connection. It can protect the side, end and mutually welded pole ears 41 of the battery cell 4, which will not be elaborated here.

[0047] See Figure 8 In some embodiments, the protective cover 21 includes two rotating plates 212, and at least one of the two rotating plates 212 can rotate toward or away from the other rotating plate 212, so that when the two rotating plates 212 are covered, a first space 211 is formed between the two rotating plates 212.

[0048] Among them, the rotating plate 212 is made of insulating material, the length direction of the rotating plate 212 is parallel to the length direction of the connecting plate 13, and the length of the rotating plate 212 is greater than the length of the pole ear 41. The ends of the two rotating plates 212 on the same side are rotatably connected to the connecting plate 13, so that the two rotating plates 212 can rotate in the direction of approaching or moving away from each other. When the two rotating plates 212 rotate to cover the pole ear 41, a first space 211 is formed between the two rotating plates 212.

[0049] In this way, when the rotating plate 212 covers the pole ear 41, the pole ear 41 is not easily bent under the protection of the rotating plate 212, thereby reducing the phenomenon of the pole ear 41 overlapping and short-circuiting, improving the safety performance of the long battery, and when the battery cell 4 is assembled from one end of the shell 6 to the inside of the shell 6, the adjacent battery cells 4 are respectively abutted against the connecting plate 13 and the rotating plate 212, which can keep the distance between adjacent battery cells 4 unchanged and achieve thrust balance, avoid local thrust being too large and causing deformation of the pole ear 41 or the battery cell 4, and insulate the sides of the two adjacent battery cells 4 that are close to each other, reducing the difficulty of assembly.

[0050] It is understandable that one of the two rotating plates 212 can be fixedly connected to the connecting plate 13, and the other can be rotatably connected to the connecting plate 13, so as to achieve protection of the tab 41. No further examples will be given here.

[0051] See Figure 8 In some embodiments, the protection assembly 2 further includes two limiting plates 22, which are disposed on the connecting plate 13. The two ends of the rotating plate 212 are rotatably connected to the two limiting plates 22. A rotating shaft 2121 is fixedly connected to the side of the rotating plate 212 facing the connecting plate 13. The limiting plates 22 are provided with limiting slots 221 that fit the ends of the rotating shaft 2121 to limit the relative position of the rotating plate 212 and the connecting plate 13.

[0052] In this way, when the rotating shaft 2121 rotates in the limiting groove 221, it can not only limit the position of the rotating plate 212, so that the rotating plate 212 is not easily offset when rotating, so that the rotating plate 212 can continue to provide protection for the pole ear 41, but also limit the rotation direction of the rotating plate 212, prevent assembly misalignment and rotation direction offset, and reduce the assembly difficulty and structural cost of long batteries.

[0053] See Figure 3 In some embodiments, the thickness L of the connecting plate 13 ranges from 0.8 mm to 2 mm, and the thickness H of the limiting plate 22 ranges from 1 mm to 4 mm. For example, the thickness L of the connecting plate 13 can be 0.8 mm, 1 mm, 1.5 mm, 1.9 mm, or 2 mm, and the thickness H of the limiting plate 22 can be 1 mm, 2 mm, 3 mm, or 4 mm.

[0054] It is understandable that the thickness L of the connecting plate 13 and the thickness H of the limiting plate 22 can be adjusted according to the width of the tab 41 , which will not be listed in detail here.

[0055] See Figure 6 and Figure 8 In some embodiments, at least one rotating plate 212 is connected to a support block 214 on a side wall facing the other rotating plate 212 . When the two rotating plates 212 are covered, a second space 213 is formed on one side of the support block 214 , and the second space 213 is connected to the first space 211 .

[0056] In this embodiment, the side walls of the two rotating plates 212 that are close to each other are correspondingly connected to support blocks 214, and a support block 214 is fixedly connected at both ends of the rotating plates 212, so that when the rotating plates 212 are closed, the support blocks 214 on the same side of the two rotating plates 212 abut against each other, and the second space 213 is located on the side of the support block 214 facing the connecting plate 13.

[0057] In this way, when the support blocks 214 abut against each other, the rotating plate 212 can be prevented from continuing to rotate toward the direction close to the pole ear 41 and causing damage to the pole ear 41, so that the rotating plate 212 can stably provide protection for the pole ear 41. Since the second space 213 is connected to the first space 211, when the battery cell 4 is out of control, the gas can flow through the second space 213 to the first space 211, reducing the obstruction to the gas and improving the exhaust efficiency. In addition, when injecting liquid, the electrolyte can also enter the first space 211 through the second space 213 and contact the pole ear 41, thereby improving the quality of the long battery and reducing the difficulty of assembly.

[0058] It is understandable that the support block 214 may also be provided on only one rotating plate 212 so as to limit the rotation of the rotating plate 212 , and this embodiment does not impose any limitation thereto.

[0059] It should be noted that during assembly, first place two adjacent battery cells 4 into the fixed bracket 1, connect the ends of the battery cells 4 to the end plate 12, connect the side walls of the battery cells 4 to the side plates 11, and pass the pole ears 41 of one of the battery cells 4 through the grooves on the connecting plate 13, and the pole ears 41 of the other battery cell 4 are located in the first space 211. After welding the pole ears 41 of the two battery cells 4 close to each other, rotate the two rotating plates 212 until they cover the welded pole ears 41, thereby realizing the assembly of the fixed bracket 1 and the battery cells 4.

[0060] See Figure 10 and Figure 11In some embodiments, the protective structure further includes an insulating film 3, which is a mylar film. The insulating film 3 is sleeved on the fixing bracket 1 and covers the fixing bracket 1 and the battery cell group to limit the relative position of the fixing bracket 1 and the battery cell group and improve the insulation protection capability of the battery cell 4. The insulating film 3 is provided with an exhaust groove 31 at the position corresponding to the connecting plate 13, so that the gas can be discharged to the outside through the exhaust groove 31, thereby improving the gas exhaust efficiency and thereby improving the safety performance of the long battery.

[0061] It is understandable that the insulating film 3 may also be provided between the fixing bracket 1 and the battery cell group, which is not limited in this embodiment.

[0062] See Figure 10 The present invention also provides a battery, including a cover plate 5, a housing 6, a cell group, and a protective structure. Two cover plates 5 are provided, and the two cover plates 5 are respectively arranged on the side of the two end plates 12 facing away from the cell group. The housing 6 is connected to the cell group and the cover plates 5. The cover plate 5 is a plain aluminum sheet and is fixedly connected to the end plates 12. The housing 6 has openings at both ends to allow the cell group to be inserted into the housing 6. The end plates 12 are provided with mounting slots 121 for the tabs 41 at the two ends of the cell group to pass through.

[0063] In this way, assembling the fixing bracket 1 to the battery cell group can improve the structural strength of the battery cell group and protect the tabs 41 between adjacent battery cells 4 to prevent the tabs 41 from bending, overlapping and short-circuiting. The structure of the fixing bracket 1 is simple, which can save structural costs and reduce assembly difficulty, so that the battery cell 4 can be stably inserted into the shell; the cover plate 5 with a light aluminum sheet structure has a simple structure, which can save space and is easy to assemble. The end plate 12 can avoid short circuit between the cover plate 5 and the battery cell 4, thereby improving the safety performance of the long battery.

[0064] See Figure 10 In some embodiments, one of the two adjacent battery cells 4 is provided with an escape groove 42, and the protective cover 21 is disposed in the escape groove 42. In this embodiment, the shape of the escape groove 42 is adapted to the shape of the rotating plate 212.

[0065] In this way, the space utilization inside the shell 6 can be improved, the space at both ends of the rotating plate 212 can be effectively utilized, and adjacent battery cells 4 can be stably connected in series through the tabs 41. It can also facilitate the positioning of the rotating plate 212 and improve assembly efficiency.

[0066] See Figure 12 In some embodiments, the width W of the avoidance groove 42 ranges from 5 mm to 10 mm. For example, the width W of the avoidance groove 42 can be 5 mm, 6 mm, 8 mm, 9 mm, or 10 mm.

[0067] It is understandable that the width W of the avoidance groove 42 can be flexibly adjusted according to the width of the rotating plate 212 and the width of the tab 41 , as long as it can accommodate the rotating plate 212 . Detailed examples are not given here.

[0068] See Figure 10 In some embodiments, the battery further includes an explosion-proof valve 7, which is disposed on the cover plate 5. Furthermore, one explosion-proof valve 7 is disposed on one cover plate 5, and the explosion-proof valve 7 is also disposed at a position of the housing 6 corresponding to the protective cover 21.

[0069] In this way, the gas discharged when the battery cell 4 is out of control can be quickly discharged to the outside through the nearby explosion-proof valve 7, shortening the formation of the airway, avoiding the accumulation of gas in the shell 6, and improving the safety performance of the long battery.

[0070] It is understandable that the number and installation positions of the explosion-proof valves 7 can be flexibly adjusted according to the actual design of the long battery, and will not be elaborated here.

[0071] 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 a battery cell group, the battery cell group includes at least two battery cells (4), the battery cells (4) are arranged along a first direction (X) and connected in series, and the protective structure includes: A fixed bracket (1), the fixed bracket (1) comprising a side plate (11) and an end plate (12), the side plate (11) being arranged on a side wall of the battery cell group parallel to the first direction (X), and two end plates (12) being provided, the two end plates (12) being arranged at both ends of the battery cell group respectively; A protective assembly (2) comprising a protective cover (21), the protective cover (21) being connected to the side plate (11), and a first space (211) being formed inside the protective cover (21) for accommodating the tabs (41) of two adjacent battery cells (4).

2. The protective structure according to claim 1, characterized in that: Two side panels (11) are provided, and the two side panels (11) are respectively provided on both sides of the battery cell group and connected to the battery cell group. The fixing bracket (1) also includes a connecting plate (13), and the connecting plate (13) is provided between two adjacent battery cells (4). Both ends of the connecting plate (13) are respectively connected to the side walls of the two side panels (11) that are close to each other. The protective cover (21) is connected to the connecting plate (13).

3. The protective structure according to claim 2, characterized in that: The protective cover (21) comprises two rotating plates (212), and at least one of the two rotating plates (212) is capable of rotating toward or away from the other rotating plate (212), so that when the two rotating plates (212) are covered, the first space (211) is formed between the two rotating plates (212).

4. The protective structure according to claim 3, characterized in that: The protection assembly (2) further comprises two limit plates (22), the two limit plates (22) being arranged on the connecting plate (13), and the two ends of the rotating plate (212) being rotatably connected to the two limit plates (22) respectively.

5. The protective structure according to claim 4, characterized in that: The thickness of the connecting plate (13) ranges from 0.8 mm to 2 mm; and / or the thickness of the limiting plate (22) ranges from 1 mm to 4 mm.

6. The protective structure according to claim 3, characterized in that: A support block (214) is connected to the side wall of at least one rotating plate (212) facing the other rotating plate (212); when the two rotating plates (212) are covered, a second space (213) is formed on one side of the support block (214); and the second space (213) is communicated with the first space (211).

7. A battery, characterized in that: The invention comprises a cover plate (5), a shell (6), a battery cell group and a protective structure according to any one of claims 1 to 6, wherein two cover plates (5) are provided, and the two cover plates (5) are respectively provided on the side of the two end plates (12) facing away from the battery cell group, and the shell (6) is connected to the battery cell group and the cover plate (5).

8. The battery according to claim 7, characterized in that One of the two adjacent battery cells (4) is provided with a relief groove (42), and the protective cover (21) is arranged in the relief groove (42).

9. The battery according to claim 8, characterized in that The width of the avoidance groove (42) ranges from 5 mm to 10 mm.

10. The battery according to claim 7, characterized in that The battery further comprises an explosion-proof valve (7), wherein the explosion-proof valve (7) is arranged on the cover plate (5); and / or the explosion-proof valve (7) is arranged at a position of the housing (6) corresponding to the protective cover (21).

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