Protective cover and battery module with same

Abstract

The utility model provides a protective cover and a battery module with the same, the protective cover comprises a cover body, the cover body extends along a first direction, the cover body is provided with an exhaust hole, and the exhaust hole is communicated with an explosion-proof valve of the battery module; and the cover plate is arranged on the cover body, and the cover plate is used for opening and closing the exhaust hole. According to the protective cover disclosed by the utility model, the cover plate is arranged on the cover body, the exhaust hole is closed by the cover plate, and the anti-explosion valve can be protected by the cover plate, so that the thermal runaway protection capability of the single battery can be improved, and the single battery can be effectively protected.

Description

Technical Field

[0001] The utility model relates to the technical field of battery module assembly manufacturing, in particular to a protective cover, a battery module and a battery module assembly having the same. Background Art

[0002] In the battery module of the existing solution, when the battery cell thermal runaway occurs, the explosion-proof valve will release high-temperature gas, which will directly melt the protective cover. When the high-temperature gas is sprayed onto the adjacent battery cell, it will cause the battery cell that has not experienced thermal runaway to thermal runaway. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a protective cover, which can improve the protection capability of thermal runaway of a battery cell.

[0004] The utility model also provides a battery module having the protective cover.

[0005] The protective cover according to the embodiment of the utility model is used for a battery module, comprising: a cover body, which extends along a first direction and is provided with an exhaust hole, wherein the exhaust hole is suitable for being connected to an explosion-proof valve of a battery cell; and a cover plate, which is arranged on the cover body and is used to open and close the exhaust hole.

[0006] According to the protective cover of the utility model, a cover plate is arranged on the cover body, and the cover plate closes the exhaust hole. The cover plate can protect the explosion-proof valve, thereby improving the thermal runaway protection capability of the battery cell and effectively protecting the battery cell.

[0007] According to some embodiments of the present invention, the cover plate is arranged on a side of the cover body away from the battery cell, and the cover plate is rotatably connected to the cover body.

[0008] According to some optional embodiments of the utility model, the cover plate includes: a plate body and a rotating shaft, one end of the plate body is fixedly connected to the rotating shaft, a fixing piece is provided on the cover body, an axial hole is provided on the fixing piece, and the end of the rotating shaft can be rotatably fitted in the axial hole.

[0009] According to some optional embodiments of the utility model, the rotating shaft is provided with a radially protruding block, and when the cover plate rotates relative to the cover body, the block and the cover body are interference fit.

[0010] According to some embodiments of the present invention, a heat insulating layer is provided on a surface of the cover plate on one side facing away from the cover body.

[0011] According to some optional embodiments of the present invention, the thermal insulation layer is mica paper, or the thermal insulation layer is an aerogel felt layer.

[0012] According to some embodiments of the utility model, at least one exhaust hole is provided on the cover body. When there are multiple exhaust holes, the exhaust holes are arranged at intervals along the first direction, and the exhaust holes correspond one-to-one to the explosion-proof valves of the battery cells.

[0013] According to some embodiments of the present invention, the cover body is provided with a flange on at least one side in the width direction, the flange extends toward the battery cell along the thickness direction of the cover body, and the flange is connected to the surface of the battery cell.

[0014] According to some optional embodiments of the utility model, the cover body is provided with flanges on both sides in the width direction, and an adhesive layer is provided on the surfaces of the two flanges arranged facing each other, and the adhesive layer is used to be bonded and connected to the surface of the battery cell.

[0015] According to the battery module of the embodiment of the second aspect of the utility model, it includes: a plurality of battery cells, the plurality of battery cells are arranged at intervals along the first direction, and the battery cells are provided with explosion-proof valves; a protective cover according to the first aspect of the utility model, the protective cover is arranged on the side where the explosion-proof valve of the plurality of battery cells is located, and the exhaust hole is connected to the explosion-proof valve; a bus bracket assembly, the bus bracket assembly is arranged between the plurality of battery cells and the protective cover, and the bus bracket assembly is provided with a connecting port connecting the explosion-proof valve and the exhaust hole.

[0016] According to the battery module of the utility model, by setting the protective cover of the first embodiment, a cover plate is set on the cover body, the cover plate closes the exhaust hole, and the cover plate can protect the explosion-proof valve, thereby improving the thermal runaway protection capability of the battery cell and effectively protecting the battery cell. In addition, the busbar bracket assembly can collect current and voltage signals of multiple battery cells, so that the operating status of multiple battery cells can be monitored in real time. Furthermore, the connecting port connects the explosion-proof valve and the exhaust hole, thereby ensuring that the explosion-proof valve can release gas from the exhaust hole normally.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of a protective cover according to an embodiment of the first aspect of the utility model;

[0019] Figure 2 yes Figure 1 A schematic diagram of a partial structure of the protective cover shown in ;

[0020] Figure 3 yes Figure 1 A schematic diagram of the cover body shown in ;

[0021] Figure 4 yes Figure 1 A schematic diagram of the cover plate shown in ;

[0022] Figure 5 yes Figure 4 A partial enlarged view of point A in the middle.

[0023] Reference numerals:

[0024] 100. Protective cover;

[0025] 10. cover body; 11. fixing member; 111. shaft hole; 12. exhaust hole; 13. flange; 131. adhesive layer;

[0026] 20. Cover plate; 21. Plate body; 22. Rotating shaft; 221. Bump; 23. Heat insulation layer. DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0028] Please refer to the following Figure 1-Figure 5 A protective cover 100 according to an embodiment of the present invention is described.

[0029] Reference Figure 1 and Figure 2 According to the protective cover 100 of the embodiment of the utility model, the protective cover 100 is used for a battery module, and the protective cover 100 includes: a cover body 10 and a cover plate 20. Specifically, the cover body 10 is along a first direction (such as Figure 1 The cover body 10 extends in the left and right directions as shown, and a vent hole 12 is provided on the cover body 10, and the vent hole 12 is suitable for being connected to the explosion-proof valve of the battery cell; a cover plate 20 is provided on the cover body 10, and the cover plate 20 is used to open and close the vent hole 12.

[0030] For example, Figure 1 and Figure 2 As shown, the cover body 10 is a rectangular plate extending in the left-right direction, and the cover body 10 is provided with an exhaust hole 12, which penetrates the cover body 10 in the front-back direction. Preferably, the cover body 10 is made of a high-temperature resistant injection molding material to prevent the cover body 10 from being damaged by the high-temperature gas released by the battery monomer, and the cover plate 20 is made of a high-temperature resistant injection molding material or a composite material to prevent the cover plate 20 from being damaged by the high-temperature gas released by the battery monomer.

[0031] When a battery cell thermally runs away, the explosion-proof valve of the battery cell will release high-temperature gas, and the gas will flow from the explosion-proof valve to the exhaust hole 12. After the gas pushes the cover plate 20 open, the gas will flow from the exhaust port to the outside of the battery cell.

[0032] The protective cover 100 of the utility model is provided with a cover plate 20 on the cover body 10, and the cover plate 20 closes the exhaust hole 12. The cover plate 20 of the battery cell can protect the explosion-proof valve to prevent the ejection of the battery cell in thermal runaway from spraying onto the explosion-proof valve of the adjacent battery cell, thereby improving the thermal runaway protection capability of the battery cell and effectively protecting the battery cell. At the same time, when the battery cell is in thermal runaway, the cover plate 20 opens the exhaust hole 12, and the explosion-proof valve can release gas to the outside from the exhaust hole 12, thereby avoiding the cover plate 20 from blocking the ejection, allowing the battery cell to release pressure normally, and further preventing the battery cell from catching fire and exploding. In addition, the cover body 10 can insulate the battery cell, effectively preventing the adjacent battery cells from short-circuiting and contacting, thereby ensuring the safety of the battery cell.

[0033] According to the protective cover 100 of the embodiment of the utility model, a cover plate 20 is arranged on the cover body 10, and the cover plate 20 closes the exhaust hole 12. The cover plate 20 can protect the explosion-proof valve, thereby improving the thermal runaway protection capability of the battery cell and effectively protecting the battery cell.

[0034] According to some embodiments of the present invention, referring to Figure 1 and Figure 2 The cover plate 20 is arranged on the side of the cover body 10 away from the battery cell (not shown in the figure), and the cover plate 20 is rotatably connected to the cover body 10. Therefore, the cover plate 20 can open and close the exhaust hole 12 normally, so as to ensure that the gas ejected from the explosion-proof valve can be normally discharged from the exhaust hole 12 to the outside of the battery cell, thereby avoiding fire and explosion when the battery cell is thermally runaway. At the same time, the cover plate 20 of the adjacent battery cell can also protect the explosion-proof valve. For example, Figure 1 and Figure 2 As shown, the cover plate 20 is disposed on the front side of the cover body 10 .

[0035] According to some optional embodiments of the present invention, referring to Figure 2 and Figure 4 The cover plate 20 includes: a plate body 21 and a rotating shaft 22, one end of the plate body 21 (such as Figure 2The upper end of the plate body 21 shown in the figure is fixedly connected with the rotating shaft 22, and the cover body 10 is provided with a fixing member 11, and the fixing member 11 is provided with an axial hole 111, and the end of the rotating shaft 22 can be rotatably matched in the axial hole 111. Therefore, the plate body 21 can cover the exhaust hole 12, which can ensure the protective effect of the cover plate 20 on the explosion-proof valve, and the rotating shaft 22 can rotate relative to the cover body 10, so that the cover plate 20 can open and close the exhaust hole 12. In addition, the fixing member 11 can provide a fixed position for the rotating shaft 22, and the axial hole 111 can facilitate the fixing of the rotating shaft 22 and the fixing member 11, so that the cover plate 20 can be conveniently fixed to the cover body 10 through the rotating shaft 22.

[0036] For example, Figure 2 and Figure 4 As shown, the plate body 21 is a rectangular plate, the upper end of the plate body 21 is connected to the rotating shaft 22, the rotating shaft 22 is extended in the left-right direction, two fixing members 11 are arranged on the upper side of the exhaust hole 12, the two fixing members 11 are arranged at intervals in the left-right direction, and the shaft hole 111 penetrates the fixing member 11 in the left-right direction. When the cover plate 20 is connected to the fixing member 11, the two ends of the rotating shaft 22 are inserted into the corresponding shaft holes 111, and the cover plate 20 can be rotatably connected relative to the cover body 10.

[0037] According to some optional embodiments of the present invention, referring to Figure 4 and Figure 5 The rotating shaft 22 is provided with a radially protruding block 221. When the cover plate 20 rotates relative to the cover body 10, the block 221 and the cover body 10 are interference fit. Interference fit means that a certain amount of interference is left between the two parts, and a certain deformation and extrusion force are generated between the two parts, so that the two parts are tightly connected.

[0038] In this way, when the battery cell is working normally, the protrusion 221 and the cover body 10 are in interference fit, and the shaft 22 cannot rotate, so that the cover plate 20 keeps the exhaust hole 12 closed, thereby effectively preventing the spray of other battery cells from spraying onto the explosion-proof valve, and then effectively protecting the battery cell. When the battery cell is thermally runaway, the spray of the battery cell can push the matching position of the protrusion 221 and the cover body 10 to deform, the shaft 22 rotates, and the cover plate 20 opens the exhaust hole 12, and the spray of the battery cell can be sprayed from the exhaust hole 12 to the outside of the battery cell, thereby avoiding the battery cell from being unable to spray the spray and causing fire and explosion. At the same time, when the battery module is assembled to the vehicle, the cover plate 20 cannot rotate, which can effectively prevent the cover plate 20 from shaking and generating resonance and abnormal noise.

[0039] For example, Figure 4 and Figure 5 As shown, a convex block 221 protruding along the radial direction of the rotating shaft 22 is provided on the upper side of the rotating shaft 22 , and the convex block 221 is interference fit with the front side surface of the cover body 10 .

[0040] According to some embodiments of the present invention, referring to Figure 4 and Figure 5 , the side surface of the cover plate 20 facing away from the cover body 10 (such as Figure 4 The front side surface of the cover plate 20 shown in the figure is provided with an insulation layer 23. Therefore, when the adjacent battery cells are in thermal runaway and emit high-temperature gas outward, the insulation layer 23 can play a heat insulation role, thereby effectively preventing the cover plate 20 from being damaged by the high-temperature gas, and further effectively protecting the explosion-proof valve.

[0041] According to some optional embodiments of the present invention, referring to Figure 4 and Figure 5 The heat insulating layer 23 is mica paper, or the heat insulating layer 23 is an aerogel felt layer. Thus, the heat insulating effect of the heat insulating layer 23 can be ensured, and the cover plate 20 and the explosion-proof valve can be effectively prevented from being damaged by heat.

[0042] According to some embodiments of the present invention, referring to Figure 1 , Figure 2 and Figure 3 , the cover body 10 is provided with at least one exhaust hole 12, that is, the cover body 10 may be provided with one, two, or three or more exhaust holes 12. When the number of the exhaust holes 12 is multiple, the exhaust holes 12 are arranged along the first direction (such as Figure 3 The exhaust holes 12 are arranged at intervals in the left and right directions as shown, and the exhaust holes 12 correspond to the explosion-proof valves of the battery cells one by one.

[0043] In this way, each explosion-proof valve can release gas from the exhaust hole 12. When the battery cell thermally runs away, it can effectively avoid the explosion-proof valve having no corresponding channel to discharge gas, causing the battery cell to catch fire and explode, thereby ensuring the safe use of the battery cell.

[0044] According to some embodiments of the present invention, referring to Figure 1 and Figure 3 , the cover body 10 is in the width direction (such as Figure 3 At least one side of the cover 10 in the vertical direction (as shown in the figure) is provided with a flange 13, that is, the cover 10 may be provided with a flange 13 on one side in the width direction, or the cover 10 may be provided with flanges 13 on both sides in the width direction, and the flange 13 is provided along the thickness direction of the cover 10 (as shown in the figure). Figure 3 The front-to-rear direction of the cover body 10 shown in the figure extends toward the battery cell, and the flange 13 is connected to the surface of the battery cell.

[0045] In this way, the flange 13 can facilitate the connection between the protective cover 100 and the battery cell, save the connection time between the protective cover 100 and the battery cell, and improve the assembly efficiency. At the same time, the cover body 10 can increase the connection area between the protective cover 100 and the battery cell, thereby increasing the connection strength between the cover body 10 and the battery cell.

[0046] According to some embodiments of the present invention, referring to Figure 1 and Figure 3 , the cover body 10 is in the width direction (such as Figure 3 The cover body 10 shown in the upper and lower directions) on both sides (such as Figure 3 The upper and lower sides of the cover 10 shown in the figure are provided with flanges 13, and the surfaces of the two flanges 13 facing each other are provided with adhesive layers 131, and the adhesive layers 131 are used to be bonded and connected with the surface of the battery cell. Therefore, the adhesive layer 131 can further increase the connection strength between the flange 13 and the battery cell, thereby increasing the connection strength between the cover 10 and the battery cell, and further effectively preventing the cover 10 from separating from the battery cell.

[0047] For example, Figure 1 and Figure 3 As shown, the upper and lower sides of the cover body 10 are provided with flanges 13, the front end of the flange 13 is connected to the cover body 10, and the rear end of the flange 13 extends backward. The lower surface of the upper flange 13 of the cover body 10 is provided with an adhesive layer 131, and the adhesive layer 131 is connected to the upper surface of the battery cell. The upper surface of the lower flange 13 of the cover body 10 is provided with an adhesive layer 131, and the adhesive layer 131 is connected to the lower surface of the battery cell, so that the strength of the connection between the cover body 10 and the battery cell can be ensured. Preferably, the adhesive layer 131 can be a double-sided adhesive or a structural adhesive, so that the bonding strength of the adhesive layer 131 can be ensured.

[0048] According to the battery module of the second embodiment of the utility model, Figure 1 and Figure 2 , comprising: a plurality of battery cells, the protective cover 100 of the first aspect of this embodiment and a busbar support assembly. Specifically, the plurality of battery cells are arranged along a first direction (such as Figure 1 The battery cells are arranged in an interval manner (in the left and right direction as shown), and explosion-proof valves are provided on the battery cells; the protective cover 100 is provided on the side where the explosion-proof valves of the multiple battery cells are located, and the exhaust hole 12 is connected to the explosion-proof valve; the bus bracket assembly is provided between the multiple battery cells and the protective cover 100, and a connecting port connecting the explosion-proof valve and the exhaust hole 12 is provided on the bus bracket assembly.

[0049] For example, multiple battery cells are arranged at intervals along the left-right direction, the explosion-proof valve is arranged on the front side of the battery cell, the protective cover 100 is arranged on the front side of the multiple battery cells, the bus bracket assembly is arranged between the multiple battery cells and the protective cover 100, and the connecting hole penetrates the bus bracket assembly along the front-to-back direction, and the number of connecting holes corresponds to the number of explosion-proof valves one by one.

[0050] According to the battery module of the embodiment of the utility model, by setting the protective cover 100 of the first embodiment, a cover plate 20 is set on the cover body 10, and the cover plate 20 closes the exhaust hole 12. The cover plate 20 can protect the explosion-proof valve, thereby improving the thermal runaway protection capability of the battery cell and effectively protecting the battery cell. In addition, the busbar bracket assembly can collect current and voltage signals of multiple battery cells, so that the operating status of multiple battery cells can be monitored in real time. In addition, the connecting port connects the explosion-proof valve and the exhaust hole 12, thereby ensuring that the explosion-proof valve can release gas from the exhaust hole 12 normally.

[0051] Reference below Figure 1-Figure 5 A battery module according to an embodiment of the present invention is described.

[0052] According to the battery module of the embodiment of the utility model, Figure 1 As shown, the battery module includes: multiple battery cells, a protective cover 100 and a bus bracket assembly, the multiple battery cells are arranged at intervals along the left-right direction, the protective cover 100 is arranged on the front side of the multiple battery cells, the bus bracket assembly is arranged between the multiple battery cells and the protective cover 100, and the bus bracket assembly is provided with a connecting port connecting the explosion-proof valve and the exhaust hole 12.

[0053] The protective cover 100 includes: a cover body 10 and a cover plate 20. Specifically, the cover body 10 is a rectangular plate extending in the left-right direction, and a plurality of exhaust holes 12 are provided on the cover body 10, and the plurality of exhaust holes 12 are arranged at intervals in the left-right direction, and the exhaust holes 12 penetrate the cover body 10 in the front-to-back direction, and the exhaust holes 12 are connected to the explosion-proof valve, and a fixing member 11 is formed on the upper side of the exhaust hole 12, and two fixing members 11 are provided on the upper side of each exhaust hole 12, and the two fixing members 11 are arranged at intervals in the left-to-right direction, and an axial hole 111 is formed on the fixing member 11, and the axial hole 111 penetrates the fixing member 11 in the left-to-right direction, and flanges 13 are provided on the upper and lower sides of the cover body 10, and the flanges 13 are extended in the front-to-back direction, and the front end of the flanges 13 is connected to the cover body 10, and the rear end of the flanges 13 extends backward, and the lower surface of the flanges 13 provided on the upper side is provided with an adhesive layer 131, and the upper surface of the flanges 13 provided on the lower side is provided with an adhesive layer 131.

[0054] The cover plate 20 includes: a plate body 21 and a rotating shaft 22. The plate body 21 is a rectangular plate, the upper end of the plate body 21 is connected to the rotating shaft 22, the rotating shaft 22 is extended in the left and right directions, the left and right ends of the rotating shaft 22 are matched to the corresponding shaft holes 111, the rotating shaft 22 can rotate in the shaft hole 111, and the radial direction of the rotating shaft 22 is provided with a radially protruding bump 221, the bump 221 is interference-fitted with the surface of the cover body 10, and the front side surface of the plate body 21 is provided with a heat insulating layer 23.

[0055] When assembling the battery module, first arrange the multiple battery cells in intervals along the left-right direction, then set the bus bracket assembly on the front side of the multiple battery cells. It should be noted that the connecting port should correspond to the explosion-proof valve. Then, the cover plate 20 is set on the front side of the multiple battery cells. It should be noted that the adhesive layer 131 of the flange 13 is bonded to the surface of the battery cell. Finally, the two ends of the rotating shaft 22 of the cover plate 20 are matched in the shaft hole 111 of the fixing part 11, and the cover plate 20 closes the exhaust hole 12. At this time, the assembly of the battery module is completed.

[0056] When the battery cell is working normally, the protrusion 221 is interference fit with the cover body 10, and the cover plate 20 closes the exhaust hole 12. When the battery cell is thermally runaway and high-temperature gas is released from the explosion-proof valve, the gas flows from the connecting hole to the exhaust hole 12, and then the gas pushes the plate body 21 to rotate counterclockwise. At this time, the plate body 21 drives the rotating shaft 22 to rotate, and the rotating shaft 22 drives the protrusion 221 to rotate. The contact position between the protrusion 221 and the cover body 10 is deformed, and the rotating shaft 22 can rotate. The cover plate 20 opens the exhaust hole 12, and the gas can flow out from the exhaust hole 12 to the outside of the battery module.

[0057] The battery module of the utility model is provided with the protective cover 100 of the first embodiment, and the cover plate 20 is provided on the cover body 10, and the cover plate 20 closes the exhaust hole 12. The cover plate 20 can protect the explosion-proof valve, thereby improving the thermal runaway protection capability of the battery cell and effectively protecting the battery cell. In addition, the busbar bracket assembly can collect current and voltage signals of multiple battery cells, so that the operating status of multiple battery cells can be monitored in real time. Furthermore, the connecting port connects the explosion-proof valve and the exhaust hole 12, thereby ensuring that the explosion-proof valve can release gas from the exhaust hole 12 normally.

[0058] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0059] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0060] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0062] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A protective cover for a battery module, characterized in that: include: A cover body, the cover body extending along a first direction, the cover body being provided with an exhaust hole, the exhaust hole being adapted to be communicated with an explosion-proof valve of a battery cell; A cover plate is arranged on the cover body, and is used to open and close the exhaust hole.

2. The protective cover according to claim 1, characterized in that: The cover plate is arranged on a side of the cover body away from the battery cell, and the cover plate is rotatably connected to the cover body.

3. The protective cover according to claim 2, characterized in that: The cover plate comprises: a plate body and a rotating shaft, one end of the plate body is fixedly connected to the rotating shaft, The cover body is provided with a fixing piece, the fixing piece is provided with an axial hole, and the end of the rotating shaft is rotatably matched in the axial hole.

4. The protective cover according to claim 3, characterized in that: The rotating shaft is provided with a convex block protruding in the radial direction, and when the cover plate rotates relative to the cover body, the convex block and the cover body are interference fit.

5. The protective cover according to claim 2, characterized in that: A heat insulating layer is provided on a surface of the cover plate on one side facing away from the cover body.

6. The protective cover according to claim 5, characterized in that: The thermal insulation layer is mica paper, or the thermal insulation layer is an aerogel felt layer.

7. The protective cover according to claim 1, characterized in that: At least one exhaust hole is provided on the cover body. When there are multiple exhaust holes, the exhaust holes are arranged at intervals along the first direction, and the exhaust holes correspond to the explosion-proof valves of the battery cells one by one.

8. The protective cover according to claim 1, characterized in that: The cover body is provided with a flange on at least one side in the width direction, the flange extends toward the battery cell along the thickness direction of the cover body, and the flange is connected to the surface of the battery cell.

9. The protective cover according to claim 8, characterized in that: The cover body is provided with flanges on both sides in the width direction, and an adhesive layer is provided on the surfaces of the two flanges arranged facing each other, and the adhesive layer is used for bonding and connecting with the surface of the battery cell.

10. A battery module, characterized in that: include: A plurality of battery cells, wherein the plurality of battery cells are arranged at intervals along the first direction, and explosion-proof valves are provided on the battery cells; The protective cover according to any one of claims 1 to 9, wherein the protective cover is provided on one side of the explosion-proof valve of the plurality of battery cells, and the exhaust hole is connected to the explosion-proof valve; A busbar support assembly is provided between the plurality of battery cells and the protective cover, and a connecting port for connecting the explosion-proof valve and the exhaust hole is provided on the busbar support assembly.

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