Battery cover plate assembly, battery and power device

Abstract

The utility model relates to the technical field of batteries, and discloses a battery cover plate assembly, a battery and a power plant, the battery cover plate assembly comprises a cover plate body, an end plate and at least one stopper, and the cover plate body is provided with an explosion-proof mechanism; the end plate is connected with the cover plate body and provided with at least one mounting groove, and at least one end of the mounting groove penetrates through the end plate to form an opening in the width direction of the cover plate body; the stop piece is correspondingly arranged in the mounting groove, and the orthographic projection of the stop piece on the cover plate body is not completely overlapped with the explosion-proof mechanism; and the stop piece is made of a high-temperature-resistant material. According to the utility model, when the battery is in thermal runaway, the temperature rises, the end plate is melted, and under the action of internal high-temperature and high-pressure gas, the pole group moves towards the anti-explosion valve, and the stop piece is arranged, so that the pole group can be prevented from shielding an anti-explosion mechanism, and the stop piece enables an exhaust channel to be formed between the cover plate body and the pole group; therefore, normal exhaust and pressure relief of the explosion-proof mechanism are facilitated, and the safety performance of the battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery cover assembly, a battery and a power device. Background Art

[0002] At present, the battery cell includes a shell, an electrode group and a cover plate assembly. The shell has an inner cavity for accommodating the electrode group. One end of the shell is open. The cover plate is arranged at the open end of the shell to encapsulate the electrode group in the shell.

[0003] The cover assembly includes an explosion-proof valve and an insulating protection structure, which can well protect the electrode group during the battery cell manufacturing process and normal use, and avoid abnormal connection and short circuit inside the battery cell.

[0004] The current battery cells use plastic materials such as PP for their insulating protection structures. When the battery cell experiences thermal runaway, the internal temperature can reach over 600°C in a short period of time. The plastic materials of the insulating protection structure will quickly melt and fail. At this time, only the electrode group is left inside the shell. Under the action of the internal high-temperature and high-pressure gas, the electrode group loses balance. Since the pressure at the cover explosion-proof valve is relatively low, the electrode group can easily move toward the explosion-proof valve, thereby blocking the explosion-proof valve and causing the battery to fail to release pressure in time, resulting in fire and explosion. Utility Model Content

[0005] In view of this, the utility model provides a battery cover assembly, a battery and a power device to solve the problem that the explosion-proof valve is easily blocked by the pole group when thermal runaway occurs in the battery cell.

[0006] In the first aspect, the utility model provides a battery cover assembly, including a cover body, an end plate and at least one stopper, wherein the cover body is provided with an explosion-proof mechanism; the end plate is connected to the cover body, and the end plate is provided with at least one mounting groove, and along the width direction of the cover body, at least one end of the mounting groove penetrates the end plate to form an opening; the stopper is correspondingly arranged in the mounting groove, and the orthographic projection of the stopper on the cover body does not completely overlap with the explosion-proof mechanism; the stopper is made of high temperature resistant material.

[0007] Beneficial effect: The battery cover assembly provided by the utility model is provided with a stopper, and the stopper is located between the cover body and the end plate. When thermal runaway occurs in the battery, the temperature rises. Since the end plate is usually made of plastic materials such as PP, the end plate melts at high temperature. Under the action of the internal high-temperature and high-pressure gas, the pole group loses balance. Since the pressure at the cover explosion-proof valve is relatively low, the pole group is easy to move toward the explosion-proof valve. Since the stopper is provided and the stopper is made of high-temperature resistant material, the stopper is intact at high temperature. Since the positive projection of the stopper on the cover body does not completely overlap with the explosion-proof mechanism, the stopper abuts between the cover body and the pole group. The stopper will not block the explosion-proof valve. At the same time, it can prevent the pole group from blocking the explosion-proof mechanism. The stopper forms an exhaust channel between the cover body and the pole group, thereby facilitating normal exhaust and pressure relief of the explosion-proof mechanism, thereby improving the safety performance of the battery.

[0008] In an optional embodiment, at least one plug-in structure is provided on the side wall of the stopper and the installation groove, and along the width direction of the cover body, the stopper is plug-in assembled with the installation groove through the plug-in structure.

[0009] Beneficial effect: the stopper and the side wall of the installation groove are plugged and assembled through the plug-in structure, and the plug-in structure can make the side wall of the installation groove play a further limiting role on the stopper, thereby preventing the stopper from being displaced and moved in the installation groove.

[0010] In an optional embodiment, the plug-in structure includes a plug-in protrusion and a plug-in groove that cooperate with each other, one of the inner wall of the installation groove and the outer wall of the stopper is provided with a plug-in protrusion, and the other of the inner wall of the installation groove and the outer wall of the stopper is provided with a plug-in groove.

[0011] Beneficial effect: By adopting the form of plug-in protrusions and plug-in grooves, the plug-in assembly of the inner wall of the installation groove and the outer wall of the stopper can be achieved, the structure is simple, and the processing is convenient.

[0012] In an optional embodiment, along the width direction of the cover body, the width of the stopper is B, the width of the mounting groove is A, B≤A, and the stopper and the mounting groove are fixedly connected.

[0013] Beneficial effect: This arrangement allows the stopper to be assembled in the mounting groove, and both ends of the stopper along the width direction will not protrude from the end plate, ensuring that the stopper will not occupy the space in the width direction of the cover body, will not increase the thickness of the battery, and at the same time, will not easily scratch other components inside the battery.

[0014] In an optional embodiment, the explosion-proof mechanism includes an explosion-proof valve, and a stopper is arranged between the explosion-proof valve and the end plate. Along the width direction of the cover plate body, the width of the explosion-proof valve is C, and along the length direction of the cover plate body, the length of the stopper is D, C+1≤B≤A-0.5, D≥C.

[0015] Beneficial effect: Since the width B of the stopper is greater than the width C of the explosion-proof valve, the stopper can abut between the cover plate body and the pole group to prevent it from flying out of the explosion-proof valve under the impact of gas pressure. Since the length D of the stopper is greater than the width C of the explosion-proof valve, when thermal runaway occurs inside the battery and the end plate melts, even if the stopper rotates and displaces under the impact of gas pressure, it will not fly out of the explosion-proof valve, ensuring that the stopper can abut between the cover plate body and the pole group, maintaining the exhaust channel, ensuring normal exhaust pressure relief, and further improving the safety performance of the battery.

[0016] In an optional embodiment, at least one side wall of the mounting groove is provided with a liquid passage hole.

[0017] Beneficial effect: By arranging the liquid holes on the side walls of the mounting groove, it is possible to facilitate the passage and infiltration of the electrolyte, prevent the electrolyte from docking in the mounting groove, and ensure the battery performance.

[0018] In an optional embodiment, the cover body is provided with a mounting hole, and the explosion-proof valve is arranged in the mounting hole. The mounting hole is a waist-shaped hole. Along the length direction of the cover body, the stopper is at least partially offset from the mounting hole. The minimum distance between the center of the arc at one end of the mounting hole close to the stopper and the edge of the stopper is a, and a≥0.

[0019] Beneficial effect: The orthographic projection of the stopper on the cover body at most overlaps with the arc segment of the explosion-proof valve. This arrangement can ensure that the stopper is supported between the electrode group and the cover body, keeping the exhaust passage unobstructed.

[0020] In an optional embodiment, the stopper includes a block structure or a frame structure, and there are at least four side walls correspondingly abutting against each other between the stopper and the mounting groove.

[0021] Beneficial effect: Since there are at least four corresponding side walls between the stopper and the mounting groove, after the stopper is assembled into the mounting groove, the stopper only has a free section along the width direction of the cover body in the mounting groove, and a firm connection between the stopper and the mounting groove can be ensured by gluing.

[0022] In the second aspect, the utility model also provides a battery, comprising a shell, a pole group and a battery cover assembly as described in any one of the above technical solutions, wherein the shell has a accommodating cavity with one end open; the pole group is arranged in the accommodating cavity; the battery cover assembly is arranged at the open end of the shell, the pole group is encapsulated in the shell, and the end plate is abutted against the pole group.

[0023] Beneficial effect: Since the battery includes the above-mentioned battery cover assembly, when the battery has thermal runaway, the temperature rises. Since the end plate is usually made of plastic materials such as PP, the end plate melts at high temperature. Under the action of the internal high-temperature and high-pressure gas, the pole group loses balance. Since the pressure at the cover explosion-proof valve is relatively low, the pole group is easy to move toward the explosion-proof valve. Since a stopper is provided and the stopper is made of high-temperature resistant material, the stopper is intact at high temperatures. Since the positive projection of the stopper on the cover body does not completely overlap with the explosion-proof mechanism, the stopper abuts between the cover body and the pole group. The stopper will not block the explosion-proof valve. At the same time, it can prevent the pole group from blocking the explosion-proof mechanism. The stopper forms an exhaust channel between the cover body and the pole group, thereby facilitating normal exhaust and pressure relief of the explosion-proof mechanism, thereby improving the safety performance of the battery.

[0024] In a third aspect, the utility model also provides a power device, comprising the battery described in the above technical solution.

[0025] Beneficial effect: Since the power device includes a battery, it has the same effect as the battery and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 This is an axonometric view of a battery cover assembly according to an embodiment of the utility model;

[0028] Figure 2 for Figure 1 A top view of

[0029] Figure 3 For along Figure 2 Sectional view at AA in the middle;

[0030] Figure 4 for Figure 1 Exploded diagram of

[0031] Figure 5 for Figure 4 A partial enlarged view of point E in the middle;

[0032] Figure 6 This is an exploded view of another battery cover assembly according to an embodiment of the present utility model.

[0033] Description of reference numerals:

[0034] 10. Battery cover assembly; 1. Cover body; 11. Mounting hole; 2. End plate; 21. Mounting groove; 211. Liquid hole; 3. Stopper; 4. Plug-in structure; 41. Plug-in protrusion; 42. Plug-in groove; 5. Explosion-proof mechanism; 51. Explosion-proof valve; 6. Pole. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0036] Combine the following Figures 1 to 6 , describing an embodiment of the utility model.

[0037] According to an embodiment of the utility model, on the one hand, a battery cover assembly 10 is provided, including a cover body 1, an end plate 2 and at least one stopper 3, the cover body 1 is provided with an explosion-proof mechanism 5; the end plate 2 is connected to the cover body 1, and the end plate 2 is provided with at least one mounting groove 21, along the width direction of the cover body 1, at least one end of the mounting groove 21 passes through the end plate 2 to form an opening; the stopper 3 is correspondingly arranged in the mounting groove 21, and the orthographic projection of the stopper 3 on the cover body 1 does not completely overlap with the explosion-proof mechanism 5; the stopper 3 is made of high temperature resistant material.

[0038] The battery cover assembly 10 provided by the utility model is provided with a stopper 3, and the stopper 3 is located between the cover body 1 and the end plate 2. When thermal runaway occurs in the battery, the temperature rises. Since the end plate 2 is usually made of plastic materials such as PP, the end plate 2 melts at high temperature. Under the action of the internal high-temperature and high-pressure gas, the pole group loses balance. Since the pressure at the cover explosion-proof valve 51 is relatively low, the pole group is easy to move toward the explosion-proof valve 51. Since the stopper 3 is provided and the stopper 3 is made of high-temperature resistant material, the stopper 3 is intact at high temperature. Since the positive projection of the stopper 3 on the cover body 1 does not completely overlap with the explosion-proof mechanism 5, the stopper 3 abuts between the cover body 1 and the pole group, and the stopper 3 will not block the explosion-proof valve 51. At the same time, it can prevent the pole group from blocking the explosion-proof mechanism 5. The stopper 3 forms an exhaust channel between the cover body 1 and the pole group, thereby facilitating normal exhaust and pressure relief of the explosion-proof mechanism 5, thereby improving the safety performance of the battery.

[0039] In addition, since the mounting groove 21 is set on the end plate 2, the stopper 3 is set in the mounting groove 21. Since the mounting groove 21 is opened along the width direction of the cover body 1, the mounting groove 21 of the end plate 2 can limit the stopper 3 along the thickness direction of the cover body 1.

[0040] Specifically, the number of the stoppers 3 is not limited, depending on the specific situation. The number of the stoppers 3 corresponds to the number of the mounting slots 21. The position of the stoppers 3 is also not limited, but should avoid the poles 6 on the cover body 1.

[0041] Specifically, at least one end of the installation groove 21 passes through the end plate 2 to form an opening, that is, both ends of the installation groove 21 pass through the end plate 2 to form two openings, and the stopper 3 can be installed in the installation groove 21 through the opening.

[0042] Specifically, the orthographic projection of the stopper 3 on the cover body 1 refers to the thickness direction of the cover body 1. Figure 4 The projection of the stopper 3 on the cover body 1 in the direction indicated by Z.

[0043] In addition, since the stopper 3 is disposed inside the battery, it will be in direct contact with the electrolyte. Therefore, in addition to being resistant to high temperatures, the stopper 3 also needs to be resistant to the electrolyte. At the same time, the stopper 3 will directly contact the electrode group after the end plate 2 melts. Therefore, the stopper 3 is also required to be made of an insulating material. The material of the stopper 3 includes, but is not limited to, ceramic.

[0044] In one embodiment, at least one plug-in structure 4 is provided on the side wall of the stopper 3 and the installation groove 21 , and along the width direction of the cover body 1 , the stopper 3 is plug-in assembled with the installation groove 21 through the plug-in structure 4 .

[0045] The stopper 3 and the side wall of the installation groove 21 are plugged and assembled via a plug-in structure 4 , which enables the side wall of the installation groove 21 to further limit the stopper 3 , thereby preventing the stopper 3 from being displaced and moved in the installation groove 21 .

[0046] In one embodiment, the plug-in structure 4 includes a plug-in protrusion 41 and a plug-in groove 42 that cooperate with each other, and one of the inner wall of the mounting groove 21 and the outer wall of the stopper 3 is provided with the plug-in protrusion 41, and the other of the inner wall of the mounting groove 21 and the outer wall of the stopper 3 is provided with the plug-in groove 42.

[0047] By adopting the plug-in protrusion 41 and the plug-in groove 42, the inner wall of the installation groove 21 and the outer wall of the stopper 3 can be plugged in and assembled, and the structure is simple and easy to process. Figure 5In the embodiment shown, a plugging protrusion 41 is provided on the inner wall of the mounting groove 21, and a plugging groove 42 matching the plugging protrusion 41 is provided on the outer wall of the stopper 3. The length directions of the plugging protrusion 41 and the plugging groove 42 both extend along the width direction of the end plate 2. After the end plate 2 and the cover plate body 1 are assembled, the width direction of the end plate 2 is also the width direction of the cover plate body 1. Figure 4 The direction indicated by Y.

[0048] Furthermore, the shapes of the plug-in protrusion 41 and the plug-in groove 42 are not limited, including rectangular, semicircular or triangular shapes.

[0049] Furthermore, the number and position of the plug-in protrusions 41 are not limited. Figure 5 In the embodiment shown, two plug-in protrusions 41 are provided, respectively provided on two opposite side walls of the mounting groove 21. The number and position of the plug-in grooves 42 on the stopper 3 are adapted thereto.

[0050] According to the position and number of the plug-in protrusions 41 provided, the cross-section of the stopper 3 and the cross-section of the mounting groove 21 can be formed into various shapes, including a cross shape or an I-shape.

[0051] Of course, the inserting groove 42 may be provided on the inner wall of the installation groove 21 , and the inserting protrusion 41 matching with the inserting groove 42 may be provided on the outer wall of the stopper 3 .

[0052] In one embodiment, Figure 5 As shown, along the width direction of the cover body 1 , the width of the stopper 3 is B, the width of the mounting groove 21 is A, B≤A, and the stopper 3 and the mounting groove 21 are fixedly connected.

[0053] Specifically, the width B of the stopper 3 is not greater than the width A of the mounting groove 21. In this way, the stopper 3 is assembled in the mounting groove 21, and both ends of the stopper 3 along the width direction will not protrude from the end plate 2, ensuring that the stopper 3 will not occupy the space in the width direction of the cover body 1, will not increase the thickness of the battery, and at the same time, will not easily scratch other components inside the battery.

[0054] In one embodiment, Figure 4 and Figure 5 As shown, the explosion-proof mechanism 5 includes an explosion-proof valve 51, and the stopper 3 is arranged between the explosion-proof valve 51 and the end plate 2. Along the width direction of the cover body 1, the width of the explosion-proof valve 51 is C, and along the length direction of the cover body 1, as shown in FIG. Figure 4 In the direction indicated by X, the length of the stopper 3 is D, C+1≤B≤A-0.5, D≥C.

[0055] Since the width B of the stopper 3 is greater than the width C of the explosion-proof valve 51, the stopper 3 can abut between the cover plate body 1 and the pole group to prevent it from flying out of the explosion-proof valve 51 under the impact of gas pressure. Since the length D of the stopper 3 is greater than the width C of the explosion-proof valve 51, when thermal runaway occurs inside the battery and the end plate 2 melts, even if the stopper 3 rotates and displaces under the impact of gas pressure, it will not fly out of the explosion-proof valve 51, ensuring that the stopper 3 can abut between the cover plate body 1 and the pole group, maintain the exhaust channel, ensure normal exhaust pressure relief, and further improve the safety performance of the battery.

[0056] In one embodiment, at least one side wall of the mounting groove 21 is provided with a liquid hole 211 .

[0057] By providing the liquid hole 211 on the side wall of the mounting groove 21, it is possible to facilitate the passage and infiltration of the electrolyte, prevent the electrolyte from docking in the mounting groove 21, and ensure the battery performance. Specifically, the liquid hole 211 can be provided on any side wall of the mounting groove 21.

[0058] In one embodiment, Figure 3 As shown, the cover body 1 is provided with a mounting hole 11, and the explosion-proof valve 51 is provided in the mounting hole 11. The mounting hole 11 is a waist-shaped hole. Along the length direction of the cover body 1, the stopper 3 is at least partially offset from the mounting hole 11. The minimum distance between the center of the arc of the mounting hole 11 close to one end of the stopper 3 and the edge of the stopper 3 is a, and a≥0.

[0059] Specifically, the mounting hole 11 is a waist-shaped hole, that is, there is an arc at each end of the mounting hole 11, and the minimum distance a≥0 between the center of the arc near one end of the stopper 3 and the edge of the stopper 3, that is, the orthographic projection of the stopper 3 on the cover body 1 at most overlaps with the arc segment of the mounting hole 11. Since the explosion-proof valve 51 is assembled on the mounting hole 11, the size of the explosion-proof valve 51 matches the size of the mounting hole 11. Therefore, in a preferred embodiment, the orthographic projection of the stopper 3 on the cover body 1 at most overlaps with the arc segment of the explosion-proof valve 51. This arrangement can ensure that the stopper 3 is supported between the pole group and the cover body 1, and keep the exhaust passage unobstructed.

[0060] In one embodiment, the stopper 3 includes a block structure or a frame structure, and there are at least four side walls correspondingly abutting against each other between the stopper 3 and the mounting groove 21 .

[0061] like Figures 1 to 5 In the illustrated embodiment, the stopper 3 is a block-shaped structure.

[0062] like Figure 6 In the illustrated embodiment, the stop block is a frame structure, which can reduce the weight of the stop member 3, thereby reducing the weight of the battery cover assembly 10 and the weight of the battery.

[0063] Since there are at least four corresponding side walls between the stopper 3 and the mounting groove 21, after the stopper 3 is assembled into the mounting groove 21, only a free section of the stopper 3 along the width direction of the cover body 1 is left in the mounting groove 21, and a firm connection between the stopper 3 and the mounting groove 21 can be ensured by gluing.

[0064] According to an embodiment of the utility model, in a second aspect, a battery is further provided, comprising a shell, a pole group and a battery cover assembly 10 as described in any one of the above technical solutions, wherein the shell has a receiving cavity with one end open; the pole group is arranged in the receiving cavity; the battery cover assembly 10 is arranged at the open end of the shell, the pole group is encapsulated in the shell, and the end plate 2 is abutted against the pole group.

[0065] Since the battery of the present embodiment includes the battery cover assembly 10 of the above-mentioned embodiment, when thermal runaway occurs in the battery, the temperature rises. Since the end plate 2 is usually made of plastic materials such as PP, the end plate 2 melts at high temperature. Under the action of the internal high-temperature and high-pressure gas, the pole group loses balance. Since the pressure at the cover explosion-proof valve 51 is relatively low, the pole group is easy to move toward the explosion-proof valve 51. Since the stopper 3 is provided and the stopper 3 is made of high-temperature resistant material, the stopper 3 is intact at high temperature. Since the positive projection of the stopper 3 on the cover body 1 does not completely overlap with the explosion-proof mechanism 5, the stopper 3 abuts between the cover body 1 and the pole group, and the stopper 3 will not block the explosion-proof valve 51. At the same time, it can prevent the pole group from blocking the explosion-proof mechanism 5. The stopper 3 forms an exhaust channel between the cover body 1 and the pole group, thereby facilitating the normal exhaust and pressure relief of the explosion-proof mechanism 5, thereby improving the safety performance of the battery.

[0066] In addition, since the battery of this embodiment includes the battery cover assembly 10 of the above-mentioned embodiment, it also has all other beneficial effects of the battery cover assembly 10, which will not be described in detail here.

[0067] According to an embodiment of the present utility model, in a third aspect, a power device is also provided, comprising the battery described in the above technical solution.

[0068] Since the power device includes a battery and has the same effect as the battery, it will not be described in detail here.

[0069] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A battery cover assembly, characterized in that: include: A cover plate body, wherein the cover plate body is provided with an explosion-proof mechanism; An end plate, the end plate is connected to the cover plate body, the end plate is provided with at least one mounting groove, and along the width direction of the cover plate body, at least one end of the mounting groove penetrates the end plate to form an opening; At least one stopper is correspondingly arranged in the installation groove, and the orthographic projection of the stopper on the cover body does not completely overlap with the explosion-proof mechanism; the stopper is made of high temperature resistant material.

2. The battery cover assembly according to claim 1, characterized in that: The stopper and the side wall of the installation groove are provided with at least one plug-in structure, and along the width direction of the cover plate body, the stopper is plug-in assembled with the installation groove through the plug-in structure.

3. The battery cover assembly according to claim 2, characterized in that: The plug-in structure includes a plug-in protrusion and a plug-in groove that cooperate with each other. The plug-in protrusion is provided on one of the inner wall of the installation groove and the outer wall of the stopper, and the plug-in groove is provided on the other of the inner wall of the installation groove and the outer wall of the stopper.

4. The battery cover assembly according to any one of claims 1 to 3, characterized in that: Along the width direction of the cover plate body, the width of the stopper is B, the width of the mounting groove is A, B≤A, and the stopper and the mounting groove are fixedly connected.

5. The battery cover assembly according to claim 4, characterized in that: The explosion-proof mechanism includes an explosion-proof valve, and the stopper is arranged between the explosion-proof valve and the end plate. Along the width direction of the cover plate body, the width of the explosion-proof valve is C, and along the length direction of the cover plate body, the length of the stopper is D, C+1≤B≤A-0.5, D≥C.

6. The battery cover assembly according to any one of claims 1 to 3, characterized in that: At least one side wall of the mounting groove is provided with a liquid passage hole.

7. The battery cover assembly according to claim 5, characterized in that: The cover body is provided with a mounting hole, the explosion-proof valve is arranged in the mounting hole, the mounting hole is a waist-shaped hole, along the length direction of the cover body, the stopper is at least partially offset from the mounting hole, and the minimum distance between the center of the arc of one end of the mounting hole close to the stopper and the edge of the stopper is a, a≥0.

8. The battery cover assembly according to any one of claims 1 to 3, characterized in that: The stopper comprises a block structure or a frame structure, and there are at least four side walls correspondingly abutting against each other between the stopper and the mounting groove.

9. A battery, characterized in that: include: A housing, wherein the housing has a receiving cavity with one end open; A pole group, arranged in the accommodating cavity; The battery cover assembly according to any one of claims 1 to 8, wherein the battery cover assembly is arranged at the open end of the shell, the electrode group is encapsulated in the shell, and the end plate abuts against the electrode group.

10. A power device, characterized in that: A battery comprising the battery of claim 9.

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