Cover plate assembly, energy storage device and electric equipment

Abstract

The utility model discloses a cover plate assembly, an energy storage device and electric equipment. The cover plate assembly comprises a cover plate, lower plastic, a sealing plug and a sealing sleeve, the cover plate is provided with an inner surface and an outer surface which are oppositely arranged, and the cover plate is further provided with a liquid injection hole penetrating through the inner surface and the outer surface; the lower plastic is stacked on the inner surface, and the liquid injection hole extends to the lower plastic and penetrates through the lower plastic; the sealing plug comprises a sealing plug body and a limiting piece arranged at the end, close to the inner surface, of the sealing plug body, the sealing plug body penetrates through the liquid injection hole, the limiting piece is configured to have a first form and a second form according to different temperatures, in the first form, the projection of the limiting piece on the inner surface is located in the liquid injection hole, and in the second form, the projection of the limiting piece on the inner surface is located in the liquid injection hole. The limiting piece prevents the sealing plug body from moving towards the outer surface; the sealing sleeve is an elastic element and is arranged between the sealing plug body and the liquid injection hole, and in the second form, the sealing plug body is in sealing fit with the sealing sleeve, and the sealing sleeve is in a compressed state.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a cover plate assembly, an energy storage device and an electrical equipment. Background Art

[0002] During the use of the battery, after multiple charge and discharge cycles, part of the electrolyte in the battery is usually consumed by the reaction. At this time, if the electrolyte can be replenished in time, the service life of the battery can be effectively increased. In the related art, during the manufacturing process of the battery, after the electrolyte is injected through the injection hole on the cover plate, the injection hole is usually sealed by a sealing structure, wherein the sealing structure may include a sealing plug and a sealing sheet. When sealing the injection hole, the sealing plug is first inserted into the injection hole, and then the sealing sheet is assembled to the end of the injection hole close to the outer surface of the cover plate, and the sealing sheet is welded to the cover plate.

[0003] However, the sealing sheet is welded to the cover plate, and it is difficult to disassemble the sealing sheet and the sealing plug, which results in that it is difficult to inject electrolyte into the battery a second time when the battery consumes too much electrolyte, thus affecting the service life of the battery. Utility Model Content

[0004] The present application discloses a cover plate assembly, an energy storage device and an electrical device, which can make it easy to disassemble and assemble a sealing plug for sealing a liquid injection hole, so that the battery can be conveniently injected with liquid for the second time, effectively improving the service life of the battery.

[0005] In order to achieve the above objectives, in a first aspect, the present application discloses a cover plate assembly, comprising:

[0006] A cover plate, wherein the cover plate has an inner surface and an outer surface arranged opposite to each other, and the cover plate is further provided with a liquid injection hole penetrating the inner surface and the outer surface;

[0007] A lower plastic, wherein the lower plastic is stacked on the inner surface, and the injection hole extends to the lower plastic and penetrates two opposite side surfaces of the lower plastic along the direction from the outer surface to the inner surface;

[0008] A sealing plug, the sealing plug comprising a sealing plug body and a stopper disposed at one end of the sealing plug body close to the inner surface, the sealing plug body being inserted into the injection hole, the stopper being configured to have a first form and a second form according to different temperatures, in the first form, a projection of the stopper on the inner surface is located in the injection hole, and in the second form, the stopper blocks the sealing plug body from moving toward the outer surface;

[0009] The sealing sleeve is an elastic element and is arranged between the sealing plug body and the injection hole. In the second form, the sealing plug body and the sealing sleeve are sealed and matched, and the sealing sleeve is in a compressed state.

[0010] In this embodiment, the limit member in the sealing plug is configured to have a first form and a second form according to the different temperatures, and in the first form, the projection of the limit member on the inner surface is located inside the injection hole, so that when the sealing plug is inserted into the injection hole along the insertion direction, the limit member is not easy to interfere with the hole wall of the injection hole, thereby making it easier to insert the sealing plug into the injection hole; in the second form, the limit member blocks the sealing plug body from moving toward the outer surface, the sealing plug body is sealed with the sealing sleeve, and the sealing sleeve is in a compressed state, ensuring that when the sealing plug is inserted into the injection hole, the sealing plug body can be effectively prevented from moving in the injection hole or sliding out of the injection hole, thereby improving the sealing reliability of the sealing plug to the injection hole. Furthermore, the limiting member is configured to have a first form and a second form according to different temperatures, so that the limiting member can be converted between the first form and the second form under different temperature environments, so that when the filling hole needs to be sealed by a sealing plug, the limiting member can be in a temperature environment having the second form, such as a normal temperature environment; and, when the battery equipped with the cover assembly needs to be filled with liquid for the second time, the limiting member can be in a temperature environment having the first form, such as a low temperature environment or a high temperature environment, so that the projection of the limiting member on the inner surface can be located within the filling hole, thereby facilitating the removal of the sealing plug from the filling hole. On the one hand, compared with the method of welding the sealing plug to the cover plate through a sealing sheet to seal the injection hole, the sealing structure of the injection hole can be simpler and easier to implement. On the second hand, the sealing plug can be easily taken out when the battery is in different temperature environments, making it easier to disassemble and assemble the sealing plug, so that the electrolyte can be injected into the battery again through the injection hole, so that the electrolyte in the battery is replenished, thereby effectively improving the service life of the battery. On the third hand, after the battery is retired, it is convenient to recycle the sealing plug, thereby improving the recycling efficiency and recycling rate of retired batteries.

[0011] In a possible implementation of the first aspect,

[0012] In the first form, the limiting member extends along the axial direction of the liquid injection hole;

[0013] In the second form, the limiting member extends along the radial direction of the liquid injection hole and abuts against an end of the sealing sleeve close to the inner surface, or abuts against the inner surface, or abuts against the lower plastic.

[0014] Therefore, the limit member can effectively avoid interference with the wall of the injection hole in the first form, facilitating the insertion and removal of the sealing plug body. In the second form, it can effectively prevent the sealing plug body from moving, thereby improving the sealing reliability of the sealing plug.

[0015] In a possible implementation of the first aspect,

[0016] A boss is arranged on the inner surface around the periphery of the injection hole, and the boss penetrates the injection hole on the lower plastic and extends out of a side surface of the lower plastic away from the inner surface;

[0017] When the temperature is greater than the first temperature or less than the second temperature, the stopper is in the first state, and the stopper extends along the axial direction of the injection hole, wherein the first temperature is greater than the second temperature, the first temperature is 80° C., and the second temperature is -40° C.;

[0018] When the temperature is between the second temperature and the first temperature, the limit member is in the second form, and the limit member includes a first bending portion and a second bending portion, the first bending portion is connected to the sealing plug body, the first bending portion extends along the radial direction of the injection hole and abuts against the end of the sealing sleeve close to the inner surface, or abuts against the end of the boss away from the inner surface, the second bending portion is connected to the first bending portion, the second bending portion extends along the axial direction of the injection hole and abuts against the outer peripheral wall of the boss.

[0019] Thus, the limiting member can better limit the sealing plug body, thereby making the sealing reliability of the sealing plug body to the injection hole better.

[0020] In a possible implementation of the first aspect, the limiting member is a thermosensitive elastic element, or the sealing plug body and the limiting member are both thermosensitive elastic elements.

[0021] Thus, the limiting member can be in the first form or the second form according to the temperature of the environment, so that the change of the form of the limiting member is easy to operate and realize.

[0022] In a possible implementation of the first aspect, there are a plurality of the limiting members, and the plurality of limiting members are disposed on an end surface of the sealing plug body close to the inner surface and are arranged at intervals around the circumference of the sealing plug body.

[0023] Thus, a plurality of limiting members can limit the sealing plug body at the same time, thereby further improving the sealing reliability of the sealing plug body.

[0024] In a possible implementation of the first aspect, the compression amount of the sealing sleeve by the sealing plug body and the liquid injection hole is A, 20%≤A≤50%.

[0025] Thus, the sealing plug body and the sealing sleeve can have better sealing performance and better sealing reliability for the injection hole. At the same time, when the sealing plug body is inserted into the injection hole, the resistance of the sealing sleeve to the sealing plug body can be smaller, so that the sealing plug body can be inserted into the injection hole more easily.

[0026] In a possible implementation of the first aspect, the cross-sectional area of ​​the sealing plug body gradually decreases along the insertion direction of the sealing plug body;

[0027] The sealing plug body and the limiting member are integrally formed.

[0028] In this way, the sealing plug body can be effectively prevented from being inserted too deeply into the liquid injection hole or falling into the interior of the battery, and the structure of the sealing plug can be made simpler and easier to manufacture; and the sealing plug can be manufactured in one go, making the manufacturing of the sealing plug simpler and easier to implement.

[0029] In a possible implementation of the first aspect, a clamping portion is provided at one end of the sealing plug body close to the outer surface.

[0030] Thus, the sealing plug can be taken out of the injection hole by holding the clamping part, or the sealing plug can be taken out of the material tray or the loading station by holding the clamping part and placed at the position of the injection hole, which facilitates the disassembly and assembly of the sealing plug.

[0031] In a possible implementation of the first aspect, the clamping portion protrudes from the outer surface, or,

[0032] A groove is provided at one end of the sealing plug body close to the outer surface, and the clamping portion is entirely located in the groove.

[0033] Thus, the clamping part protrudes from the outer surface, making it easier to clamp the clamping part, further facilitating the disassembly and assembly of the sealing plug. The clamping part is entirely located in the groove, so that the top patch on the outer surface can be attached relatively flatly, reducing the difficulty of attaching the top patch, and can also cover the injection hole and the sealing plug.

[0034] In a possible implementation of the first aspect, the sealing sleeve includes a sealing sleeve body and a limiting portion, the sealing sleeve body is located between the sealing plug body and the injection hole, the limiting portion is arranged at one end of the sealing sleeve body close to the inner surface, and the limiting portion is arranged around the outer peripheral wall of the sealing sleeve body, the limiting portion is in contact with the inner surface on one side of the sealing sleeve body, or the limiting portion is in contact with the lower plastic on one side of the sealing sleeve body.

[0035] The side of the limiting part facing the sealing sleeve body abuts against the inner surface, which can effectively prevent the sealing sleeve body from slipping out of the injection hole, thereby ensuring that the sealing plug and the sealing sleeve have better sealing reliability for the injection hole.

[0036] In a possible implementation of the first aspect, the limiting portion is an annular structure.

[0037] Thus, the structure of the limiting part can be made simple and easy to implement.

[0038] In a possible implementation of the first aspect, the limiting portion includes a plurality of limiting baffles arranged around an outer peripheral wall of the sealing sleeve body.

[0039] Therefore, when the sealing sleeve body is inserted into the injection hole, the limiting part can be deformed more easily, so that the sealing sleeve body can be inserted into the injection hole more labor-saving, reducing the difficulty of inserting the sealing sleeve body into the injection hole.

[0040] In a possible implementation of the first aspect, the sealing sleeve is made of any one of fluororubber and EPDM.

[0041] Therefore, the sealing sleeve can have good elasticity and can be less likely to be corroded by the electrolyte, so that the sealing sleeve has a longer service life.

[0042] In a possible implementation of the first aspect, a diameter of a circumscribed circle of the sealing sleeve gradually decreases along an insertion direction of the sealing plug body.

[0043] Thus, each part of the sealing sleeve body located between the sealing plug body and the injection hole can be sealed and connected between the sealing plug body and the injection hole, so that the sealing performance between the sealing plug body and the injection hole can be better.

[0044] In a possible implementation of the first aspect, the sealing sleeve has a center hole, the center hole is a through hole, the sealing plug body is inserted into the center hole, and the sealing plug body, the injection hole and the center hole are coaxially arranged.

[0045] By coaxially arranging the sealing plug body, the injection hole and the center hole, the compression amounts of the various parts of the sealing sleeve located between the sealing plug body and the injection hole can be relatively consistent, thereby enabling the sealing plug body and the sealing sleeve to better seal the injection hole.

[0046] In a second aspect, the present application further discloses an energy storage device, comprising the cover plate assembly described in the first aspect, wherein in the first form, the sealing plug is detachably inserted into the sealing sleeve, and the sealing sleeve is in a natural state.

[0047] In this embodiment, the cover plate assembly in the energy storage device is the cover plate assembly described in the first aspect above, so the cover plate assembly in this embodiment has the technical effect of the cover plate assembly in the first aspect above.

[0048] In a third aspect, the present application further discloses an electrical device, comprising the energy storage device described in the second aspect.

[0049] In this embodiment, the energy storage device in the electrical equipment is any one of the energy storage devices in the second aspect, so the energy storage device in this embodiment has the technical effect of the energy storage device in the second aspect. And the cover plate assembly in the energy storage device in the second aspect is the cover plate assembly described in the first aspect, so the cover plate assembly in this embodiment has the technical effect of the cover plate assembly in the first aspect.

[0050] Compared with the prior art, the beneficial effects of this application are:

[0051] In the present application, the limit member in the sealing plug is configured to have a first form and a second form according to the different temperatures, and in the first form, the projection of the limit member on the inner surface is located inside the injection hole, so that when the sealing plug is inserted into the injection hole along the insertion direction, the limit member is not easy to interfere with the hole wall of the injection hole, thereby making it easier to insert the sealing plug into the injection hole; in the second form, the limit member blocks the sealing plug body from moving toward the outer surface, the sealing plug body is sealed with the sealing sleeve, and the sealing sleeve is in a compressed state, ensuring that when the sealing plug is inserted into the injection hole, the sealing plug body can be effectively prevented from moving in the injection hole or sliding out of the injection hole, thereby improving the sealing reliability of the sealing plug to the injection hole. Furthermore, the limiting member is configured to have a first form and a second form according to different temperatures, so that the limiting member can be converted between the first form and the second form under different temperature environments, so that when the filling hole needs to be sealed by a sealing plug, the limiting member can be in a temperature environment having the second form, such as a normal temperature environment; and, when the battery equipped with the cover assembly needs to be filled with liquid for the second time, the limiting member can be in a temperature environment having the first form, such as a low temperature environment or a high temperature environment, so that the projection of the limiting member on the inner surface can be located within the filling hole, thereby facilitating the removal of the sealing plug from the filling hole. On the one hand, compared with the method of welding the sealing plug to the cover plate through a sealing sheet to seal the injection hole, the sealing structure of the injection hole can be simpler and easier to implement. On the second hand, the sealing plug can be easily taken out when the battery is in different temperature environments, making it easier to disassemble and assemble the sealing plug, so that the electrolyte can be injected into the battery again through the injection hole, so that the electrolyte in the battery is replenished, thereby effectively improving the service life of the battery. On the third hand, after the battery is retired, it is convenient to recycle the sealing plug, thereby improving the recycling efficiency and recycling rate of retired batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0053] Figure 1 is an exploded view of a cover plate assembly provided in an embodiment of the present application;

[0054] Figure 2 is a three-dimensional diagram of a cover plate assembly provided in an embodiment of the present application;

[0055] Figure 3 is a cross-sectional view of a cover plate assembly of a sealing plug provided by an embodiment of the present application in a first form;

[0056] Figure 4 yes Figure 3 A magnified image of the position A in the middle;

[0057] Figure 5 is a cross-sectional view of a cover plate assembly of the first sealing plug provided by an embodiment of the present application in a second state;

[0058] Figure 6 yes Figure 5 The enlarged image at position B in the middle;

[0059] Figure 7 is an exploded view of a sealing plug and a sealing sleeve in a second state of a sealing plug provided by an embodiment of the present application;

[0060] Figure 8 is a three-dimensional diagram of the first sealing plug provided by an embodiment of the present application in the second form;

[0061] Fig. 9 is a cross-sectional view of a cover plate assembly of a second sealing plug provided by an embodiment of the present application in a second form;

[0062] Fig.10 yes Fig. 9 Enlarged view of the C position in the middle;

[0063] Fig.11 is a three-dimensional diagram of the second sealing plug provided by an embodiment of the present application in the second form;

[0064] Fig.12 is a three-dimensional diagram of a sealing sleeve provided in an embodiment of the present application;

[0065] Fig.13 is a three-dimensional diagram of an energy storage device provided in an embodiment of the present application;

[0066] Fig.14 It is a three-dimensional diagram of an electrical device provided in an embodiment of the present application.

[0067] Description of reference numerals:

[0068] 1-cover plate; 11-inner surface; 12-outer surface; 13-liquid injection hole; 14-boss;

[0069] 2-sealing plug; 21-sealing plug body; 211-clamping part; 212-groove; 22-limiting member; 221-first bending part; 222-second bending part; 3-sealing sleeve; 31-sealing sleeve body; 32-limiting part; 33-center hole; 4-lower plastic;

[0070] 100-electrical equipment; 110-energy storage device; 10-cover assembly. DETAILED DESCRIPTION

[0071] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0072] In this application, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0073] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0074] The present application discloses a cover plate assembly, an energy storage device and an electrical device, which can make it easy to disassemble and assemble a sealing plug for sealing a liquid injection hole, so that the battery can be conveniently injected with liquid for the second time, effectively improving the service life of the battery.

[0075] The technical solution of the present application will be further described below in conjunction with specific embodiments and drawings.

[0076] Embodiment 1

[0077] This embodiment provides a cover plate assembly, such as Figure 1-Figure 6As shown, it includes a cover plate 1, a lower plastic 4, a sealing plug 2 and a sealing sleeve 3. The cover plate 1 has an inner surface 11 and an outer surface 12 arranged opposite to each other, and a liquid injection hole 13 penetrating the inner surface 11 and the outer surface 12 is also arranged on the cover plate 1; the lower plastic 4 is stacked on the inner surface 11, and the liquid injection hole 13 extends to the lower plastic 4 and penetrates the two opposite side surfaces of the lower plastic 4 along the direction of the outer surface 12 pointing to the inner surface 11; the sealing plug 2 includes a sealing plug body 21 and a stopper 22 arranged at one end of the sealing plug body 21 close to the inner surface 11, the sealing plug body 21 is penetrated in the liquid injection hole 13, and the stopper 22 is configured to have a first form and a second form according to different temperatures. In the first form, the projection of the stopper 22 on the inner surface 11 is located in the liquid injection hole 13, and in the second form, the stopper 22 blocks the sealing plug body 21 from moving toward the outer surface 12; the sealing sleeve 3 is an elastic element and is arranged between the sealing plug body 21 and the liquid injection hole 13. In the second form, the sealing plug body 21 is sealed with the sealing sleeve 3, and the sealing sleeve 3 is in a compressed state.

[0078] It should be explained that the above-mentioned sealing sleeve 3 being in a compressed state means that the sealing sleeve 3 is an elastic element, and when the sealing sleeve 3 and the injection hole 13 are interference fit, the sealing sleeve 3 located between the sealing plug body 21 and the injection hole 13 is in a state of being squeezed and compressed.

[0079] In this embodiment, the stopper 22 in the sealing plug 2 is configured to have a first shape and a second shape according to different temperatures, and in the first shape, the projection of the stopper 22 on the inner surface 11 is located in the injection hole 13, so that when the sealing plug 2 is inserted in the insertion direction (such as Figure 1The limiting member 22 is not easy to interfere with the wall of the liquid injection hole 13, so that the sealing plug 2 can be inserted into the liquid injection hole 13 more easily. In the second form, the limiting member 22 blocks the sealing plug body 21 from moving toward the outer surface 12, and the sealing plug body 21 is sealed with the sealing sleeve 3, and the sealing sleeve 3 is in a compressed state, so that when the sealing plug 2 is inserted into the liquid injection hole 13, the sealing plug body 21 can be effectively prevented from moving in the liquid injection hole 13 or sliding out of the liquid injection hole 13, thereby improving the sealing reliability of the sealing plug 2 to the liquid injection hole 13. Moreover, the limit member 22 is configured to have a first form and a second form according to the different temperatures, so that the limit member 22 can be converted between the first form and the second form under different temperature environments, so that when the injection hole 13 needs to be sealed by the sealing plug 2, the limit member 22 can be in a temperature environment having the second form, such as a normal temperature environment; and, when the battery equipped with the cover plate assembly 10 needs to be injected with liquid for the second time, the limit member 22 can be in a temperature environment having the first form, such as a low temperature environment or a high temperature environment, so that the projection of the limit member 22 on the inner surface 11 can be located in the injection hole 13, thereby facilitating the removal of the sealing plug 2 from the injection hole 13. On the one hand, compared with the method of welding the sealing plug 2 to the cover plate 1 through a sealing sheet to seal the injection hole 13, the sealing structure of the injection hole 13 can be simpler and easier to implement. On the second hand, the sealing plug 2 can be easily removed when the battery is in different temperature environments, making it easier to disassemble and assemble the sealing plug 2, so that the electrolyte can be injected into the battery again through the injection hole 13, so that the electrolyte in the battery is replenished, thereby effectively improving the service life of the battery. On the third hand, after the battery is retired, it is convenient to recycle the sealing plug 2, thereby improving the recycling efficiency and recycling rate of retired batteries.

[0080] It should be explained that the above-mentioned normal temperature environment refers to a temperature environment in which the battery can work normally, such as -10°C, 5°C, 20°C, 30°C, etc. The above-mentioned low temperature environment refers to a temperature environment lower than the normal working temperature of the battery, such as -40°C, -50°C, -55°C, etc. The above-mentioned high temperature environment refers to a temperature environment higher than the normal working temperature of the battery, such as 80°C, 85°C, 90°C, etc.

[0081] The cover plate assembly 10 also includes a sealing sleeve 3, which is an elastic element and is arranged between the sealing plug body 21 and the injection hole 13. On the one hand, compared with the direct sealing connection between the sealing plug body 21 and the injection hole 13, the circumscribed circle of the sealing plug body 21 can be slightly smaller than the aperture of the injection hole 13, so that the sealing plug body 21 is easier to insert into the injection hole 13. On the other hand, the sealing performance between the sealing plug body 21 and the injection hole 13 can also be better, thereby effectively preventing leakage of the electrolyte.

[0082] The above-mentioned limit member 22 is configured to have a first form and a second form according to different temperatures, wherein the limit member 22 can be in the first form in a temperature environment below -40°C, such as -40°C, in the second form in a temperature environment above 80°C, such as 80°C, and in the second form in a temperature environment between -30°C and 60°C, such as -30°C, 30°C, and 60°C.

[0083] Specifically, the battery that needs to be equipped with the sealing plug 2 and the sealing sleeve 3 can be in a temperature environment below -40°C. At this time, the limit member 22 can be deformed into the first form. For example, when the limit member 22 is a memory alloy metal strip, the limit member 22 can extend along the axial direction of the injection hole 13, so that the limit member 22 can be in the first form while preventing other components of the battery from being frozen, thereby facilitating the installation and removal of the sealing plug 2. After the sealing plug 2 and the sealing sleeve 3 are assembled in the injection hole 13, the battery equipped with the sealing plug 2 and the sealing sleeve 3 can be placed in a temperature environment higher than 80°C. At this time, the limiting member 22 can be transformed into the second form. For example, when the limiting member 22 is a memory alloy metal strip, the limiting member 22 can extend along the radial direction of the injection hole 13 and abut against the inner surface 11, so that other components of the battery are not thermally damaged and the limiting member 22 can be in the second form to prevent the sealing plug 2 from sliding out of the injection hole 13 when it is impacted or vibrated; and, when the battery equipped with the sealing plug 2 and the sealing sleeve 3 is in a temperature environment of -30°C to 60°C, the limiting member 22 can still be in the second form, so that the battery can be used normally and the battery can be prevented from accidentally sliding out of the injection hole 13 during use.

[0084] It should be explained that the projection of the above-mentioned stopper 22 on the inner surface 11 is located inside the injection hole 13. Figure 4 As shown, along the insertion direction of the sealing plug body 21, the projection of the limit member 22 on the inner surface 11 is located inside the injection hole 13, so that when the sealing plug body 21 is inserted into the injection hole 13 along the insertion direction, the limit member 22 is not likely to interfere with the hole wall of the injection hole 13, thereby facilitating the insertion of the sealing plug body 21.

[0085] In the above-mentioned first form, the projection of the limit member 22 on the inner surface 11 is located inside the injection hole 13. The limit member 22 may extend along the insertion direction of the sealing plug body 21, that is, the limit member 22 extends along the axial direction of the injection hole 13; or the limit member 22 extends in a direction at a certain angle to the axial direction of the injection hole 13, and the projection of the end of the limit member 22 away from the sealing plug body 21 on the inner surface 11 along the insertion direction of the sealing plug body 21 is located within the area enclosed by the hole wall of the injection hole 13; of course, the limit member 22 may also extend in other directions in the first form, as long as the projection of the limit member 22 on the inner surface 11 along the insertion direction of the sealing plug body 21 is located inside the injection hole 13, and no limitation is made here.

[0086] Similarly, in the second form, the limit member 22 blocks the sealing plug body 21 from moving toward the outer surface 12. The limit member 22 may extend in a direction perpendicular to the insertion direction of the sealing plug body 21, that is, the limit member 22 extends radially along the injection hole 13; or the limit member 22 extends in a direction having a certain angle with the radial direction of the injection hole 13, and the projection of the end of the limit member 22 away from the sealing plug body 21 along the insertion direction of the sealing plug body 21 on the inner surface 11 is outside the area enclosed by the hole wall of the injection hole 13; of course, the limit member 22 may also extend in other directions in the second form, as long as the limit member 22 can block the sealing plug body 21 from moving toward the outer surface 12, and this is not limited here.

[0087] In addition, the limiting member 22 may be a limiting strip, a limiting column, or a bar-shaped limiting sheet, which is not limited here.

[0088] In some embodiments, Figure 3-Figure 8 As shown, in the first form, the limiter 22 extends axially along the injection hole 13; in the second form, the limiter 22 extends radially along the injection hole 13 and abuts against one end of the sealing sleeve 3 close to the inner surface 11, or abuts against the inner surface 11, or abuts against the lower plastic 4.

[0089] It should be explained that the above-mentioned limit member 22 extending along the axial direction of the injection hole 13 means that the extension direction of the limit member 22 is roughly parallel to the axial direction of the injection hole 13, and does not mean that the extension direction of the limit member 22 must be parallel to the axial direction of the injection hole 13.

[0090] It should also be explained that the radial extension of the limiter 22 along the injection hole 13 means that the extension direction of the limiter 22 is roughly parallel to the radial direction of the injection hole 13, which does not mean that the extension direction of the limiter 22 must be parallel to the radial direction of the injection hole 13.

[0091] Therefore, the limit member 22 can effectively avoid interference with the hole wall of the injection hole 13 in the first form, and facilitate the insertion and removal of the sealing plug body 21. In the second form, it can effectively prevent the sealing plug body 21 from moving, so that the sealing reliability of the sealing plug 2 is better.

[0092] Among them, when the limiting member 22 extends radially along the injection hole 13 and abuts against the end of the sealing sleeve 3 close to the inner surface 11, the end of the sealing sleeve 3 close to the inner surface 11 can protrude from the inner surface 11, or the end of the sealing sleeve 3 close to the inner surface 11 can be flush with the inner surface 11, which is not limited here. At this time, the projection of the end of the limiting member 22 away from the sealing plug body 21 along the insertion direction of the sealing plug body 21 on the inner surface 11 is located outside the injection hole 13.

[0093] When the limiting member 22 extends radially along the injection hole 13 and abuts against the inner surface 11, the inner surface 11 of the cover plate 1 can be a flat surface, or a boss 14 can be provided on the inner surface 11 of the cover plate 1, and the limiting member 22 abuts against the end of the boss 14 away from the outer surface 12, which is not limited here.

[0094] When the limiting member 22 abuts against the lower plastic 4 , the limiting member 22 may abut against a surface of the lower plastic 4 that is away from the inner surface 11 .

[0095] In other embodiments, Figure 4 , Figure 9-11 As shown, a boss 14 is arranged around the periphery of the injection hole 13 on the inner surface 11, and the boss 14 is penetrated in the injection hole 13 on the lower plastic 4 and extends out of a side of the lower plastic 4 away from the inner surface 11; when the temperature is greater than the first temperature or less than the second temperature, the limiter 22 is in the first state, and the limiter 22 extends along the axial direction of the injection hole 13, wherein the first temperature is greater than the second temperature, the first temperature is 80°C, and the second temperature is -40°C; when the temperature is between the second temperature and the first temperature, the limiter 22 is in the first state. When in a normal temperature environment, the limit member 22 is in the second form, and includes a first bending portion 221 and a second bending portion 222. The first bending portion 221 is connected to the sealing plug body 21, and the first bending portion 221 extends along the radial direction of the injection hole 13 and abuts against the end of the sealing sleeve 3 close to the inner surface 11, or abuts against the end of the boss 14 away from the inner surface 11, and the second bending portion 222 is connected to the first bending portion 221, and the second bending portion 222 extends along the axial direction of the injection hole 13 and abuts against the outer peripheral wall of the boss 14.

[0096] It should be explained that the above-mentioned second bend portion 222 extending along the axial direction of the injection hole 13 means that the extension direction of the second bend portion 222 is roughly parallel to the axial direction of the injection hole 13, and does not mean that the extension direction of the second bend portion 222 must be parallel to the axial direction of the injection hole 13.

[0097] Therefore, in the second form, the limiting member 22 includes a first bent portion 221 and a second bent portion 222, the first bent portion 221 extends along the radial direction of the injection hole 13 and abuts against one end of the sealing sleeve 3 close to the inner surface 11, or abuts against one end of the boss 14 away from the inner surface 11, the second bent portion 222 is connected to the first bent portion 221, and the second bent portion 222 extends along the axial direction of the injection hole 13 and abuts against the outer peripheral wall of the boss 14, so that the limiting member 22 can better limit the sealing plug body 21, thereby making the sealing reliability of the sealing plug body 21 to the injection hole 13 better.

[0098] Among them, when the first bent portion 221 extends radially along the injection hole 13 and abuts against the end of the sealing sleeve 3 close to the inner surface 11, the end of the sealing sleeve 3 close to the inner surface 11 can protrude from the end of the boss 14 away from the inner surface 11; when the first bent portion 221 extends radially along the injection hole 13 and abuts against the end of the boss 14 away from the inner surface 11, the end of the sealing sleeve 3 close to the inner surface 11 can be flush with the end of the boss 14 away from the inner surface 11, or can be recessed in the end of the boss 14 away from the inner surface 11.

[0099] In addition, the boss 14 may be a prismatic boss 14 , a cylindrical boss 14 , or a frustum-shaped boss 14 , which is not limited here.

[0100] The high temperature environment may be an environment with a temperature higher than 80°C, such as 80°C, 90°C, 100°C, etc. The low temperature environment may be an environment with a temperature lower than -40°C, such as -40°C, -50°C, -60°C, etc. The normal temperature environment may be an environment with a temperature between -30°C and 60°C, such as -30°C, -15°C, 0°C, 30°C, 60°C, etc.

[0101] The above-mentioned limiting member 22 may be a thermosensitive elastic element, or the sealing plug body 21 and the limiting member 22 may both be thermosensitive elastic elements.

[0102] Thus, the limiting member 22 can be in the first form or the second form according to the temperature of the environment, so that the switching of the limiting member 22 between the first form and the second form can be easily realized.

[0103] Among them, the limit member 22 can have a variety of implementation methods. For example, the material of the limit member 22 can be a shape memory polymer plastic material, which not only enables the limit member 22 to present different shapes at different temperatures, but also is light in weight and has good plasticity; it can also be a memory alloy, which also enables the limit member 22 to present different shapes under different temperature environments, and also has high structural strength, and is not prone to breakage when impacted, thereby enabling the sealing plug body 21 to have better sealing reliability.

[0104] The sealing plug body 21 may also have a variety of implementation methods. For example, the material of the sealing plug body 21 and the material of the limiter 22 may both be shape memory polymer plastic materials, which not only enables the sealing plug body 21 and the limiter 22 to present different shapes at different temperatures, but also is lightweight and has good plasticity. It may also be a memory alloy, which also enables the sealing plug body 21 and the limiter 22 to present different shapes at different temperature environments, and also has high structural strength and is not prone to breakage when impacted, thereby enabling the sealing reliability of the sealing plug body 21 to be better.

[0105] It needs to be explained that when the material of the limit member 22 is a memory alloy, the above-mentioned limit member 22 is in a temperature environment having a second form, such as a normal temperature environment, the limit member 22 can be relatively stably in the second form. Specifically, the second form of the limit member 22 in the normal temperature environment can be called the mother phase, and when the limit member 22 is in a low temperature environment, it is the first form. Then, when the limit member 22 is placed in a normal temperature environment, the limit member 22 can still remain in the first form, and when the limit member 22 is placed in a high temperature environment, the limit member 22 can be transformed from the first form to the second form. At this time, the limit member 22 is placed from a high temperature environment to a normal temperature environment, and the limit member 22 can be in the second form, that is, in the mother phase state. Similarly, when the limit member 22 is in a high temperature environment, it is in the first form. Then, when the limit member 22 is placed in a normal temperature environment, the limit member 22 is still in the first form. When the limit member 22 is placed in a low temperature environment, the limit member 22 can be transformed from the first form to the second form. At this time, when the limit member 22 is placed from the low temperature environment to the normal temperature environment, the limit member 22 can be in the second form, that is, the limit member 22 is in the parent phase state.

[0106] The memory alloy may be any one of nickel-titanium alloy, copper-zinc alloy, copper-zinc-aluminum alloy, iron-platinum alloy, iron-manganese-aluminum-nickel alloy and the like.

[0107] When the memory alloy is nickel-titanium alloy, the limit piece 22 of nickel-titanium alloy can be in the first form in a temperature environment below -40°C, such as -40°C, -50°C, etc., and in the second form in a temperature environment above 80°C, such as 80°C, 90°C, etc., and still in the second form in a temperature environment of -30°C to 60°C, such as -30°C, 30°C, 60°C, etc.

[0108] Alternatively, if Figure 7 , Figure 8 and Fig.11 As shown, there are multiple limiting members 22 , which are disposed on the end surface of the sealing plug body 21 close to the inner surface 11 and are arranged at intervals around the circumference of the sealing plug body 21 .

[0109] Thus, a plurality of limiting members 22 can limit the sealing plug body 21 at the same time, further improving the sealing reliability of the sealing plug body 21; and the length of the sealing plug body 21 along the insertion direction can be shorter, saving costs.

[0110] Among them, a plurality of stoppers 22 are arranged at intervals around the circumference of the sealing plug body 21 on the end surface of the sealing plug body 21 close to the inner surface 11, and the plurality of stoppers 22 can be arranged at uniform intervals around the circumference of the sealing plug body 21, so that when the plurality of stoppers 22 limit the sealing plug body 21, the limiting force exerted on the sealing plug body 21 can be relatively uniform. Of course, the plurality of stoppers 22 can also be arranged at non-uniform intervals around the circumference of the sealing plug body 21 on the end surface of the sealing plug body 21 close to the inner surface 11, which is not limited here.

[0111] The number of the limiting members 22 may be two, three or more, which is not limited here.

[0112] Optionally, the limit member 22 and the sealing plug body 21 can be integrally formed so that the sealing plug 2 can be manufactured in one go, such as by injection molding, making the manufacturing of the sealing plug 2 relatively simple and easy to implement; alternatively, the limit member 22 and the sealing plug body 21 are manufactured separately, and then the limit member 22 and the sealing plug body 21 are connected together, such as by welding or bonding.

[0113] In addition, in order to prevent the sealing plug body 21 from being inserted too deeply in the insertion direction or falling into the battery due to excessive force during insertion, in some embodiments, a limit platform may be provided at one end of the sealing plug body 21 close to the outer surface 12. The limit platform is provided along the periphery of the sealing plug body 21, and along the insertion direction, the projection of the limit platform on the outer surface 12 is at least partially located outside the injection hole 13.

[0114] In other embodiments, Figure 7 , Figure 8and Fig.11 As shown, the cross-sectional area of ​​the sealing plug body 21 gradually decreases along the insertion direction of the sealing plug body 21, that is, the sealing plug body 21 is in the shape of a cone or a frustum, and the diameter of the circumscribed circle of the sealing plug body 21 gradually decreases along the insertion direction, which can also effectively prevent the sealing plug body 21 from being inserted too deep into the injection hole 13 or falling into the interior of the battery, and can also make the structure of the sealing plug 2 simpler and easier to manufacture.

[0115] At this time, the sealing plug body 21 can be a cone, a truncated cone, or a truncated pyramid, which is not limited here. The injection hole 13 can be a conical hole or a cylindrical hole, which is not limited here.

[0116] Optionally, the above-mentioned sealing sleeve 3 is an elastic element. When the thickness of the sealing sleeve 3 located between the sealing plug body 21 and the injection hole 13 is greater than the distance between the sealing plug body 21 and the hole wall of the injection hole 13, the portion of the sealing sleeve 3 located between the sealing plug body 21 and the injection hole 13 can be compressed, and the compression amount of the sealing sleeve 3 by the sealing plug body 21 and the injection hole 13 is A, 20%≤A≤50%.

[0117] Thus, the sealing plug body 21 and the sealing sleeve 3 can have better sealing performance and better sealing reliability to the injection hole 13. At the same time, when the sealing plug body 21 is inserted into the injection hole 13, the resistance of the sealing sleeve 3 to the sealing plug body 21 can be smaller, so that the sealing plug body 21 can be inserted into the injection hole 13 more easily.

[0118] When the compression amount of the sealing sleeve 3 by the above-mentioned sealing plug body 21 and the injection hole 13 is less than 20%, although the resistance of the sealing sleeve 3 to the insertion of the sealing plug body 21 can be reduced, so that the sealing plug body 21 can be inserted into the injection hole 13 more easily, it is easy to cause the sealing performance of the sealing plug body 21 and the sealing sleeve 3 to the injection hole 13 to be poor, and it is easy to cause the sealing plug body 21 to loosen and move in the injection hole 13, thereby reducing the sealing reliability of the sealing plug body 21.

[0119] When the compression amount of the sealing plug body 21 and the injection hole 13 on the sealing sleeve 3 is greater than 50%, although the sealing plug body 21 and the sealing sleeve 3 can better seal the injection hole 13, and it is not easy for the sealing plug body 21 to loosen or move when impacted, but when the sealing plug body 21 is inserted into the injection hole 13, the sealing sleeve 3 needs to be compressed to a large extent, which may make it difficult to insert the sealing plug body 21 into the injection hole 13, thereby increasing the difficulty of installing the sealing plug 2.

[0120] Among them, the compression amount of the sealing sleeve 3 caused by the sealing plug body 21 and the injection hole 13 is between 20% and 50%. The compression amounts of various parts of the sealing sleeve 3 located between the sealing plug body 21 and the injection hole 13 may be roughly the same and are all between 20% and 50%. Alternatively, the compression amounts of various parts of the sealing sleeve 3 located between the sealing plug body 21 and the injection hole 13 are different, and the compression amounts of various parts are all between 20% and 50%. This is not limited here.

[0121] The sealing sleeve 3 is an elastic element, and its material can be any one of fluororubber, EPDM, etc. Therefore, the sealing sleeve 3 can have good elasticity and can also be not easily corroded by the electrolyte, so that the sealing sleeve 3 has a longer service life.

[0122] Alternatively, if Figure 7 , Figure 8 and Fig.11 As shown, a clamping portion 211 is provided at one end of the sealing plug body 21 close to the outer surface 12 .

[0123] Therefore, when the battery needs to be injected with liquid for the second time and the limiting member 22 is in the second form, the sealing plug 2 can be taken out from the injection hole 13 by clamping the clamping part 211, and when assembling the sealing plug 2, the sealing plug 2 can also be taken out from the material tray or the loading station by clamping the clamping part 211 and placed at the position of the injection hole 13, which facilitates the disassembly and assembly of the sealing plug 2.

[0124] The clamping portion 211 may be implemented in a variety of ways. For example, the clamping portion 211 may be a clamping ring, a clamping protrusion, or a straight or cross-shaped clamping groove, which is not limited here.

[0125] In addition, the position of the clamping portion 211 relative to the outer surface 12 may also have various configurations. In one possible implementation, Figure 7 and Figure 8 The clamping portion 211 protrudes from the outer surface 12. For example, when the clamping portion 211 is a clamping ring or a clamping protrusion, the clamping ring or the clamping protrusion can be convexly arranged on the outer surface 12. Thus, the clamping portion 211 can be more easily clamped, further facilitating the disassembly and assembly of the sealing plug 2.

[0126] In another possible implementation, Fig.11 As shown, a groove 212 is provided at one end of the sealing plug body 21 close to the outer surface 12 , and the clamping portion 211 is entirely located in the groove 212 .

[0127] Thus, the cover plate assembly 10 can also include a top patch, wherein the top patch is made of insulating material, and when the top patch is attached to the outer surface 12, the portion of the top patch covering the injection hole 13 and the other portions of the top patch covering the outer surface 12 are located in the same plane, so that the top patch can be attached more flatly, reducing the difficulty of attaching the top patch, and can also cover the injection hole 13 and the sealing plug 2, so that the sealing plug 2 can be insulated by the top patch when it is a conductive metal.

[0128] It should be explained that the above-mentioned clamping portion 211 being located as a whole in the groove 212 means that one end of the clamping portion 211 close to the outer surface 12 is flush with the groove end surface of the groove 212 or is recessed in the groove end surface of the groove 212, that is, or one end of the clamping portion 211 close to the outer surface 12 is flush with the outer surface 12 or is recessed in the outer surface 12.

[0129] In some embodiments, Figure 6 , Figure 7 and Fig.12 As shown, the sealing sleeve 3 includes a sealing sleeve body 31 and a limiting portion 32. The sealing sleeve body 31 is located between the sealing plug body 21 and the injection hole 13. The limiting portion 32 is arranged at one end of the sealing sleeve body 31 close to the inner surface 11, and the limiting portion 32 is arranged around the outer peripheral wall of the sealing sleeve body 31. The limiting portion 32 is in contact with the inner surface 11 on one side of the sealing sleeve body 31, or the limiting portion 32 is in contact with the lower plastic on one side of the sealing sleeve body 31.

[0130] Thus, the limiting portion 32 abuts against the inner surface 11 on one side of the sealing sleeve body 31 , which can effectively prevent the sealing sleeve body 31 from slipping out of the injection hole 13 , thereby enabling the sealing plug 2 and the sealing sleeve 3 to have better sealing reliability for the injection hole 13 .

[0131] The sealing sleeve body 31 may be a tubular structure located between the sealing plug body 21 and the injection hole 13 .

[0132] Furthermore, the limiting portion 32 may have a variety of implementations. In one possible implementation, Figure 7 As shown, the limiting portion 32 is a ring-shaped structure.

[0133] Thus, the periphery of the sealing sleeve body 31 can be limited by the limiting portion 32, so that the sealing sleeve 3 is less likely to slip out of the injection hole 13, and the sealing reliability of the sealing plug 2 and the sealing sleeve 3 to the injection hole 13 is further improved. In addition, the structure of the limiting portion 32 can be simple and easy to implement.

[0134] The limiting portion 32 is an annular structure, which may be a circular annular structure, a rectangular annular structure, or an elliptical annular structure, which is not limited here.

[0135] In another possible implementation, Fig.12 As shown, the limiting portion 32 includes a plurality of limiting baffles arranged around the outer peripheral wall of the sealing sleeve body 31 .

[0136] Therefore, when the sealing sleeve body 31 is inserted into the injection hole 13, the limiting portion 32 is easier to deform, so that the sealing sleeve body 31 can be inserted into the injection hole 13 with less effort, thereby reducing the difficulty of inserting the sealing sleeve body 31 into the injection hole 13.

[0137] Among them, multiple limit baffles can be evenly arranged around the outer peripheral wall of the sealing sleeve body 31, so that the sealing sleeve body 31 is subjected to relatively uniform resistance along the circumferential direction when inserted into the injection hole 13, thereby avoiding the sealing sleeve body 31 from tilting during insertion and facilitating the assembly of the sealing sleeve body 31.

[0138] Of course, the plurality of limit blocking pieces may be arranged non-uniformly around the outer peripheral wall of the sealing sleeve body 31, which is not limited here.

[0139] In addition, the limiting blocking piece may have a variety of shapes, for example, the limiting blocking piece may be a fan-shaped structure, a trapezoidal structure, or a rectangular structure, which is not limited here.

[0140] The shape of the sealing sleeve body 31 can also be various, such as a straight tube structure with the same diameter of the circumscribed circle at each location; Figure 7 and Fig.12 As shown, the diameter of the circumscribed circle of the sealing sleeve body 31 gradually decreases along the insertion direction of the sealing plug body 21, that is, the sealing sleeve body 31 can be a tubular structure in the shape of a cone, thereby, all parts of the sealing sleeve body 31 located between the sealing plug body 21 and the injection hole 13 can be sealed and connected between the sealing plug body 21 and the injection hole 13, that is, the parts of the sealing sleeve body 31 located between the sealing plug body 21 and the injection hole 13 can be compressed, so that the sealing performance between the sealing plug body 21 and the injection hole 13 can be better.

[0141] Furthermore, when the sealing sleeve body 31 is a tubular structure in a truncated cone shape, the sealing sleeve body 31 may be a tubular structure in a truncated cone shape or a tubular structure in a prism shape, which is not limited herein.

[0142] In addition, the sealing sleeve body 31 is located in the injection hole 13, and the diameter of the circumscribed circle of the sealing sleeve body 31 may be slightly larger than the inner diameter of the injection hole 13, so that when the sealing sleeve body 31 is inserted into the injection hole 13, there can be a large friction resistance between the sealing sleeve body 31 and the hole wall of the injection hole 13, effectively preventing the sealing sleeve body 31 from moving into the battery; alternatively, the sealing sleeve body 31 is bonded to the injection hole 13 by adhesive, so that the sealing sleeve body 31 can be firmly inserted into the injection hole 13, which can also effectively prevent the sealing sleeve body 31 from moving into the battery in the injection hole 13, and effectively avoid the sealing sleeve body 31 from slipping into the battery.

[0143] In some embodiments, Figure 6 , Figure 7 and Fig.12 As shown, the sealing sleeve 3 has a central hole 33 , which is a through hole, the sealing plug body 21 is inserted into the central hole 33 , and the sealing plug body 21 , the injection hole 13 and the central hole 33 are coaxially arranged.

[0144] Thus, all parts of the sealing plug body 21 located at the injection hole 13 can be sealed and connected to the injection hole 13 through the sealing sleeve 3, and the sealing plug body 21, the injection hole 13 and the center hole 33 are coaxially arranged, so that the compression amounts of all parts of the sealing sleeve 3 located between the sealing plug body 21 and the injection hole 13 can be relatively consistent, thereby enabling the sealing of the sealing plug body 21 and the sealing sleeve 3 to the injection hole 13 to be better.

[0145] Furthermore, when the limiting member 22 is in the second form, the sealing plug 2 can be removed for secondary liquid filling of the battery, and the electrolyte can be injected through the center hole 33 without removing the sealing sleeve 3, thereby simplifying the operation process of the sealing plug 2 and the sealing sleeve 3 during the secondary liquid filling of the battery and reducing the difficulty of the secondary liquid filling operation of the battery.

[0146] The injection hole 13 may be substantially the same in shape as the sealing plug body 21 and the sealing sleeve 3 , for example, the injection hole 13 may be a tapered hole or a straight hole.

[0147] Embodiment 2

[0148] This embodiment also provides an energy storage device, such as Fig.13 As shown, it includes the cover plate assembly 10 described in any one of the first embodiments. In the first form, the sealing plug 2 is detachably inserted into the sealing sleeve 3, and the sealing sleeve 3 is in a natural state.

[0149] It should be explained that the natural state of the sealing sleeve 3 mentioned above refers to the state in which the sealing sleeve 3 located between the sealing plug body 21 and the injection hole 13 is not squeezed or compressed.

[0150] In the present embodiment, in the first form, the sealing plug 2 is detachably inserted into the sealing sleeve 3, and the sealing sleeve 3 is in a natural state, so that when the sealing plug 2 is in a temperature environment that can have the first form, such as a low temperature environment or a high temperature environment, the sealing plug 2 can be conveniently removed from the sealing sleeve 3, so that the sealing plug 2 can be taken out from the injection hole 13, or both the sealing plug 2 and the sealing sleeve 3 can be taken out from the injection hole 13, so that the electrolyte can be injected again through the injection hole 13, so that the electrolyte in the energy storage device 110 can be replenished, thereby effectively improving the service life of the energy storage device 110, and after the energy storage device 110 is retired, the sealing plug can be conveniently recycled, thereby improving the recycling efficiency and recycling rate of the retired energy storage device 110.

[0151] The cover plate assembly 10 in the energy storage device 110 is the cover plate assembly 10 described in the above-mentioned embodiment 1. Therefore, the cover plate assembly 10 in this embodiment has the technical effect of the cover plate assembly 10 in the above-mentioned embodiment 1. Since the technical effect of the cover plate assembly 10 has been fully described in embodiment 1, it will not be repeated here.

[0152] The energy storage device 110 may be any one of a single cell, a battery module, a battery pack, an energy storage cabinet, an energy storage box, etc., and is not limited here.

[0153] Embodiment 3

[0154] This embodiment also provides an electrical device, such as Fig.14 As shown, it includes the energy storage device 110 described in the second embodiment.

[0155] In this embodiment, the energy storage device 110 in the electrical equipment 100 is any one of the energy storage devices 110 in the above-mentioned embodiment 2, so the energy storage device 110 in this embodiment has the technical effect of the energy storage device 110 in the above-mentioned embodiment 2. Since the technical effect of the energy storage device 110 has been fully described in the embodiment 2, it will not be repeated here. And the cover plate assembly 10 in the energy storage device 110 in the embodiment 2 is the cover plate assembly 10 described in the above-mentioned embodiment 1, so the cover plate assembly 10 in this embodiment has the technical effect of the cover plate assembly 10 in the above-mentioned embodiment 1. Since the technical effect of the cover plate assembly 10 has been fully described in the above-mentioned embodiment 1, it will not be repeated here.

[0156] The electrical device 100 may be any one of a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, an energy storage device, etc., which is not limited here. For example, when the electrical device is an energy storage device, it may be a mobile emergency power supply vehicle, an emergency power supply cabinet in a building, a fire emergency power supply device, etc., which is not limited here.

[0157] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A cover plate assembly, characterized in that: include: A cover plate, wherein the cover plate has an inner surface and an outer surface arranged opposite to each other, and the cover plate is further provided with a liquid injection hole penetrating the inner surface and the outer surface; A lower plastic, wherein the lower plastic is stacked on the inner surface, and the injection hole extends to the lower plastic and penetrates two opposite side surfaces of the lower plastic along the direction from the outer surface to the inner surface; A sealing plug, the sealing plug comprising a sealing plug body and a stopper disposed at one end of the sealing plug body close to the inner surface, the sealing plug body being inserted into the injection hole, the stopper being configured to have a first form and a second form according to different temperatures, in the first form, a projection of the stopper on the inner surface is located in the injection hole, and in the second form, the stopper blocks the sealing plug body from moving toward the outer surface; The sealing sleeve is an elastic element and is arranged between the sealing plug body and the injection hole. In the second form, the sealing plug body and the sealing sleeve are sealed and matched, and the sealing sleeve is in a compressed state.

2. The cover plate assembly according to claim 1, characterized in that: In the first form, the limiting member extends along the axial direction of the liquid injection hole; In the second form, the limiting member extends along the radial direction of the liquid injection hole and abuts against an end of the sealing sleeve close to the inner surface, or abuts against the inner surface, or abuts against the lower plastic.

3. The cover plate assembly according to claim 1, characterized in that: A boss is arranged on the inner surface around the periphery of the injection hole, and the boss penetrates the injection hole on the lower plastic and extends out of a side surface of the lower plastic away from the inner surface; When the temperature is greater than the first temperature or less than the second temperature, the stopper is in the first form, and the stopper extends along the axial direction of the injection hole, wherein the first temperature is greater than the second temperature, the first temperature is 80° C., and the second temperature is -40° C.; When the temperature is between the second temperature and the first temperature, the limit member is in the second form, and the limit member includes a first bending portion and a second bending portion, the first bending portion is connected to the sealing plug body, the first bending portion extends along the radial direction of the injection hole and abuts against the end of the sealing sleeve close to the inner surface, or abuts against the end of the boss away from the inner surface, the second bending portion is connected to the first bending portion, the second bending portion extends along the axial direction of the injection hole and abuts against the outer peripheral wall of the boss.

4. The cover plate assembly according to claim 1, characterized in that: The limiting member is a thermosensitive elastic element, or the sealing plug body and the limiting member are both thermosensitive elastic elements.

5. The cover plate assembly according to claim 1, characterized in that: There are multiple limiting members, which are arranged on the end surface of the sealing plug body close to the inner surface and are arranged at intervals around the circumference of the sealing plug body.

6. The cover plate assembly according to claim 1, characterized in that: The compression amount of the sealing plug body and the liquid injection hole on the sealing sleeve is A, 20%≤A≤50%.

7. The cover plate assembly according to claim 1, characterized in that: The cross-sectional area of ​​the sealing plug body gradually decreases along the insertion direction of the sealing plug body; The sealing plug body and the limiting member are integrally formed.

8. The cover plate assembly according to claim 1, characterized in that: A clamping portion is provided at one end of the sealing plug body close to the outer surface.

9. The cover plate assembly according to claim 8, characterized in that: The clamping portion protrudes from the outer surface, or, A groove is provided at one end of the sealing plug body close to the outer surface, and the clamping portion is entirely located in the groove.

10. The cover plate assembly according to any one of claims 1 to 9, characterized in that: The sealing sleeve includes a sealing sleeve body and a limiting portion, wherein the sealing sleeve body is located between the sealing plug body and the injection hole, the limiting portion is arranged at one end of the sealing sleeve body close to the inner surface, and the limiting portion is arranged around the outer peripheral wall of the sealing sleeve body, and the limiting portion abuts against the inner surface on one side of the sealing sleeve body, or abuts against the lower plastic on one side of the sealing sleeve body.

11. The cover plate assembly according to claim 10, characterized in that: The limiting portion is an annular structure.

12. The cover plate assembly according to claim 10, characterized in that: The limiting portion includes a plurality of limiting baffles arranged around the outer peripheral wall of the sealing sleeve body.

13. The cover plate assembly according to any one of claims 1 to 9, characterized in that: The sealing sleeve is made of any one of fluororubber and EPDM.

14. The cover plate assembly according to any one of claims 1 to 9, characterized in that: The diameter of the circumscribed circle of the sealing sleeve gradually decreases along the insertion direction of the sealing plug body.

15. The cover plate assembly according to any one of claims 1 to 9, characterized in that: The sealing sleeve has a central hole, which is a through hole. The sealing plug body is inserted into the central hole, and the sealing plug body, the injection hole and the central hole are coaxially arranged.

16. An energy storage device, characterized in that: The cover plate assembly comprises the cover plate assembly according to any one of claims 1 to 15, wherein in the first form, the sealing plug is detachably inserted into the sealing sleeve, and the sealing sleeve is in a natural state.

17. An electrical equipment, characterized in that: Includes the energy storage device as described in claim 16.

Images