CN220627902U - Cover plate assembly, battery core and power utilization device - Google Patents

Abstract

The utility model provides a cover plate assembly, an electric core and an electric device, wherein the cover plate assembly comprises: the cover plate comprises a cover plate main body, an anti-explosion valve plate and an electrolyte detection part. The cover plate main body is provided with a through pressure relief hole; the anti-explosion valve plate is fixedly arranged in the pressure relief hole; the electrolyte detection part is exposed in the pressure relief hole at one side of the opening direction of the anti-explosion valve plate and is configured to change the shape after being contacted with electrolyte. When electrolyte enters the pressure relief hole, whether the electrolyte pollutes the pressure relief hole can be judged by observing the shape change of the electrolyte detection part, so that the problem that whether the electrolyte pollutes the pressure relief hole can not be detected in the existing battery cell cover plate assembly can be solved.

Description

Cover plate assembly, battery core and power utilization device

Technical Field

The utility model relates to the technical field of batteries, in particular to a cover plate assembly, an electric core and an electric device.

Background

In the prior art, electrolyte overflowed in the process of filling the battery cell or electrolyte sprayed out in the process of knocking other battery cells easily enters the pressure relief hole. If electrolyte enters the pressure relief hole, the electrolyte can easily further reach the exposed surface of the anti-explosion valve plate, so that the notch or the welding area of the anti-explosion valve plate is corroded and damaged, and the non-functional failure of the anti-explosion valve plate is caused. Meanwhile, as the electrolyte is usually colorless and transparent liquid, whether the electrolyte enters the pressure relief hole or not is difficult to identify, and the potential safety hazard is large after the electrolyte is installed in the later period.

Disclosure of Invention

In view of the above drawbacks of the prior art, the present utility model provides a cover plate assembly, a battery cell and an electric device, so as to solve the problem that whether the electrolyte pollutes the inside of the pressure release hole cannot be detected in the existing battery cell cover plate assembly.

To achieve the above and other related objects, a first aspect of the present utility model provides a cap plate assembly comprising: the cover plate comprises a cover plate main body, an anti-explosion valve plate and an electrolyte detection part. The cover plate main body is provided with a through pressure relief hole; the anti-explosion valve plate is fixedly arranged in the pressure relief hole; the electrolyte detection part is exposed in the pressure relief hole at one side of the opening direction of the anti-explosion valve plate and is configured to change the shape after being contacted with electrolyte.

In an example of the cover plate assembly of the present utility model, the electrolyte detecting part includes an adsorbing and expanding material body or a corrosion dissolving material body.

In an example of the cover plate assembly of the present utility model, the electrolyte detecting part includes an expanded leather and/or an expanded adhesive tape.

In an example of the cover plate assembly of the present utility model, the electrolyte detecting part includes an ink layer.

In an example of the cover plate assembly, the cover plate assembly further comprises a protection sheet, the protection sheet is arranged in the pressure relief hole at one side of the opening direction of the anti-explosion valve plate, and the electrolyte detection part is arranged at one side of the protection sheet, which is away from the anti-explosion valve plate.

In an example of the cover plate assembly, the cover plate assembly further comprises an explosion-proof valve patch, the explosion-proof valve patch covers an opening of one side of the pressure relief hole, which is away from the explosion-proof valve plate, and the electrolyte detection part is configured to expand to push up the explosion-proof valve patch after absorbing electrolyte.

In an example of the cover plate assembly, the electrolyte detecting part is arranged on the surface of one side of the protective sheet away from the explosion-proof valve plate or on the surface of one side of the explosion-proof valve patch close to the explosion-proof valve plate; or on the side wall of the pressure relief hole.

In an example of the cover plate assembly of the present utility model, the explosion-proof valve patch is made of transparent material, and a gas channel is provided between the explosion-proof valve patch and the pressure relief hole.

In an example of the cover plate assembly, a boss is arranged on the side wall of the pressure relief hole, and the protection sheet is arranged on the boss; the protective sheet comprises one or more of mica sheets, ceramic sheets and high-temperature resistant glass fiber sheets.

In an example of the cover plate assembly of the present utility model, the cover plate assembly further includes a liquid injection hole, and the electrolyte detecting portion is at least in contact with an inner wall of the pressure release hole on a side close to the liquid injection hole.

The utility model also provides a battery cell, which comprises a shell, an electrode assembly arranged in the shell and the cover plate assembly.

The utility model also provides an electric device which comprises a working part and the electric core, wherein the working part is electrically connected with the electric core to obtain electric energy support.

In the cover plate assembly, the electrolyte detection part with the shape changed after being contacted with the electrolyte is arranged in the pressure relief hole at one side of the opening direction of the anti-explosion valve plate, when the electrolyte enters the pressure relief hole, whether the electrolyte pollutes the inside of the pressure relief hole or not can be judged by observing the shape change of the electrolyte detection part, and further measures can be taken when judging that the pollution is caused, so that the electrolyte is prevented from entering the pressure relief hole to corrode the anti-explosion valve plate.

Further, the cover plate assembly further comprises a protective sheet and an explosion-proof valve patch, and the electrolyte detection part is arranged between the explosion-proof valve patch and the protective sheet and is configured to expand to push up the explosion-proof valve patch after absorbing electrolyte. An operator can observe whether electrolyte enters the pressure relief hole or not through the state of the explosion-proof valve patch without checking the pressure relief hole, and the pressure relief hole can be changed into a passive state; and the protective sheet is arranged in the pressure relief hole, so that the area is relatively small, the space can be saved, the weight can be reduced, and the cost can be saved.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a three-dimensional schematic of an embodiment of a cell of the present utility model;

FIG. 2 is a three-dimensional schematic view of an embodiment of a cover assembly of the present utility model;

FIG. 3 is a schematic top view of an embodiment of a cover plate assembly of the present utility model;

FIG. 4 is a cross-sectional view taken along section A-A in FIG. 3;

FIG. 5 is an enlarged view of area B of FIG. 4;

FIG. 6 is an enlarged view of region C of FIG. 5 in one embodiment of the cover assembly of the present utility model;

FIG. 7 is an enlarged view of region C of FIG. 5 in another embodiment of the cover plate assembly of the present utility model;

FIG. 8 is an enlarged view of region C of FIG. 5 in a further embodiment of the cover plate assembly of the present utility model;

FIG. 9 is a three-dimensional schematic view of an embodiment of a cover assembly of the present utility model;

FIG. 10 is an enlarged view of region D of FIG. 7;

FIG. 11 is a front view of region D of FIG. 7;

FIG. 12 is a three-dimensional schematic view of an embodiment of a cover assembly of the present utility model;

FIG. 13 is an enlarged view of area E of FIG. 12;

FIG. 14 is a front view of the area E of FIG. 12;

FIG. 15 is a schematic view of an embodiment of a cover plate assembly according to the present utility model after the electrolyte detection portion of the surface of the protective sheet is eroded.

Description of element reference numerals

1. A battery cell; 100. a cover plate assembly; 110. a cover plate main body; 121. an explosion-proof valve plate; 1211. scoring; 122. a protective sheet; 1221. an electrolyte detection unit; 1222. a second adhesive layer; 1223. etching the profile; 123. a first adhesive layer; 124. a third adhesive layer; 125. an explosion-proof valve patch; 130. a liquid injection hole; 140. a positive electrode post; 141. a positive electrode post mounting hole; 150. a negative electrode post; 151. a negative electrode post mounting hole; 160. a pressure relief hole; 161. a first boss; 162. a through hole; 163. a second boss; 200. a housing.

Detailed Description

Other advantages and effects of the present utility model will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present utility model with reference to specific examples. The utility model may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present utility model. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict. It is also to be understood that the terminology used in the examples of the utility model is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the utility model. The test methods in the following examples, in which specific conditions are not noted, are generally conducted under conventional conditions or under conditions recommended by the respective manufacturers.

Where numerical ranges are provided in the examples, it is understood that unless otherwise stated herein, both endpoints of each numerical range and any number between the two endpoints are significant both in the numerical range. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs and to which this utility model belongs, and any method, apparatus, or material of the prior art similar or equivalent to the methods, apparatus, or materials described in the examples of this utility model may be used to practice the utility model.

It should be understood that the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like are used in this specification for descriptive purposes only and not for purposes of limitation, and that the utility model may be practiced without materially departing from the novel teachings and without departing from the scope of the utility model.

Referring to fig. 1 to 15, the present utility model provides a cover plate assembly 100, a battery cell 1 and an electric device, wherein an electrolyte detecting portion 1221 with a shape changed after contacting with an electrolyte is disposed in the pressure release hole 160 on one side of the opening direction of the explosion-proof valve on the cover plate assembly 100, and when the electrolyte enters the pressure release hole 160, the shape change of the electrolyte detecting portion 1221 can be observed to determine whether the electrolyte pollutes the pressure release hole 160, so that the problem that the existing cover plate assembly 100 of the battery cell 1 cannot detect whether the electrolyte pollutes the pressure release hole 160 can be solved.

Referring to fig. 1, the battery cell 1 of the present utility model includes a case 200, an electrode assembly (not shown) disposed within the case 200, and a cap plate assembly 100.

The structure and shape of the case 200 are not limited as long as a space that can be used to accommodate an electrode assembly, an electrolyte (not shown), and other internal components can be formed. The housing 200 may be of various shapes and sizes, such as a cylinder, a rectangular parallelepiped, a hexagonal prism, etc. Specifically, the shape of the case 200 may be determined according to the specific shape and size of the electrode assembly. The case 200 has at least one opening through which the internal components of the electrode assembly are fitted into the case 200, and the cap plate assembly 100 is sealed to the opening to hermetically mount the internal components of the electrode assembly, etc., in the case 200.

The electrode assembly is a component in which electrochemical reactions occur in the cell 1. One or more electrode assemblies may be contained within the case 200. The electrode assembly is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode plate and the negative electrode plate with active substances form the main body of the electrode assembly, the parts of the positive electrode plate without active substances form positive electrode lugs, and the parts of the negative electrode plate without active substances form negative electrode lugs.

Referring to fig. 2 and 6 to 8, the cover assembly 100 includes: a cap body 110, an explosion proof valve sheet 121, and an electrolyte detecting portion 1221. The shape of the cover main body 110 is matched with the shape of the opening of the housing 200, for example, when the opening is circular, the cover assembly 100 is circular, and when the opening is rectangular, the cover assembly 100 is rectangular, but not limited thereto, and may have other shapes. A through pressure relief hole 160 is formed along the thickness direction of the cover main body 110; the shape of the pressure release hole 160 may be selected according to the shape of the valve block 121 or the installation requirement, and may be, for example, circular, rectangular or other shapes. In this embodiment, the valve block 121 has two parallel straight sides and two waist holes connecting the two ends of the parallel straight sides in a smooth manner, so the shape of the pressure relief hole 160 is also a shape matching with the valve block 121, and of course, other shapes can be used without affecting the installation and opening of the valve block 121. The pressure release hole 160 may be formed to have a uniform cross section or a non-uniform cross section, and may be formed to have a stepped shape along the direction of penetration, for example, but is formed so as not to interfere with the opening of the valve block 121.

The anti-explosion valve plate 121 is fixedly installed in the pressure relief hole 160; the fixing manner of the valve block 121 in the pressure relief hole 160 may be any of a variety of manners, including but not limited to welding, and the electrolyte detecting portion 1221 is exposed in the pressure relief hole 160 on one side of the opening direction of the valve block 121 and configured to change shape after contacting with the electrolyte. When electrolyte enters the pressure relief hole 160, whether the electrolyte pollutes the inside of the pressure relief hole 160 can be judged by observing the shape change of the electrolyte detecting part 1221, and further measures can be taken when judging that the pollution is caused, so that the electrolyte is prevented from entering the pressure relief hole 160 to corrode the explosion-proof valve plate 121. It should be noted that, the opening direction of the valve block 121 refers to a direction perpendicular to the valve block 121 and pointing away from the electrode assembly, i.e., a direction pointed by a Z arrow in fig. 4.

In the present utility model, the electrolyte solution detecting part 1221 may be any material that can change its shape after being in contact with the electrolyte solution, for example, may be any material that undergoes a change such as swelling or dissolution, for example, may be an absorbent/expandable material that can absorb the electrolyte solution and expand, for example, may be expanded leather, an expanded rubber strip, or a composite of expanded leather and an expanded rubber strip; the body of material, such as an ink layer, may also be dissolved by corrosion after contact with the electrolyte. In this embodiment, the electrolyte detection portion includes the absorption swelling material body, and absorption swelling material body can adsorb electrolyte, and whether the electrolyte is polluted to the pressure release hole can be judged through the volume change of absorption swelling material body on the one hand, and another side absorption swelling material body can absorb electrolyte, prevents that electrolyte from further flowing to explosion-proof valve block position, can take out the electrolyte that wets simultaneously when changing. However, as shown in fig. 15, in another embodiment of the present utility model, the electrolyte solution detection portion includes a bare body of corrosion-dissolving material, such as an ink layer, which may be formed of an ink material directly coated directly on the corresponding location surface (e.g., directly on the guard sheet 122), and contacts the electrolyte solution detection portion 1221 when the electrolyte solution flows down from the side wall of the pressure relief hole to form the corrosion profile 1223 shown in fig. 15. However, when the inspector looks into the pressure release hole 160 against the direction of the Z arrow, the inspector can easily find the morphological change of the exposed material or ink layer, so as to determine whether the electrolyte enters the pressure release hole 160 or not, and determine whether to take further inspection or cleaning measures.

Referring to fig. 1 to 3, two poles may be simultaneously disposed on the cover plate assembly 100 of the present utility model, for example, as shown in fig. 1 to 3, a positive pole 140 and a negative pole 150 with opposite polarities may be disposed, the positive pole 140 is fixedly mounted in the positive pole mounting hole 141 and electrically connected to the positive pole lug of the electrode assembly, and the negative pole 150 is fixedly mounted in the negative pole mounting hole 151 and electrically connected to the negative pole lug of the electrode assembly. Only the positive electrode post 140 may be provided, and a negative electrode corresponding to the positive electrode post 140 may be formed by the conductive case 200, and at this time, it is necessary to electrically connect the positive electrode tab and the positive electrode post 140 and electrically connect the negative electrode tab and the case 200; only the negative electrode post 150 may be provided, and the positive electrode corresponding to the negative electrode post 150 may be formed by the conductive case 200, and at this time, it is necessary to electrically connect the negative electrode tab with the negative electrode post 150 and electrically connect the positive electrode tab with the case 200; even, on the premise that the battery cell 1 is provided with other proper positions of the positive electrode or the negative electrode, the cover plate assembly of the utility model is not provided with any pole.

Referring to fig. 3 to 6, although the cap assembly 100 of the present utility model may not have the liquid injection hole 130 in the case of having other suitable positions of the liquid injection hole 130, in an example of the cap assembly 100 of the present utility model, the cap body 110 is provided with the liquid injection hole 130, and the shape of the liquid injection hole 130 is not limited and is used for injecting the electrolyte into the housing 200. Although the electrolyte detecting part 1221 is exposed in the pressure release hole 160 on the opening direction side of the valve block 121, the electrolyte detecting part 1221 is preferably provided on a flow path of the electrolyte from the pressure release hole 160 to the valve block 121 in order to prevent the leakage of the electrolyte when the electrolyte is introduced in a large amount.

Considering that when the electrolyte overflows from the filling hole 130, it flows mostly along the surface of the cover plate to the edge of the pressure relief hole 160 and flows down along the sidewall of the pressure relief hole 160, the electrolyte detecting part 1221 is configured to contact at least the inner wall of the pressure relief hole 160 on the side close to the filling hole 130. Referring to fig. 8, in an example of the cover plate assembly 100 of the present utility model, the electrolyte detecting portion 1221 is made of an adsorbing and expanding material body and is disposed around the side wall of the pressure release hole 160. The manner of surrounding is not limited, and for example, the pressure relief hole 160 may be stuck or formed in a sleeve shape matching the shape of the pressure relief hole 160, and the stuck side wall may be placed in the pressure relief hole 160. The surrounding side wall can be found more timely when electrolyte enters the pressure relief hole 160 on one hand, and can absorb the electrolyte to prevent the electrolyte from further reaching the bottom of the anti-explosion valve plate 121 on the other hand.

As shown in fig. 8, in an embodiment of the present utility model, a second boss 163 circumferentially disposed around the relief hole 160 is provided in the relief hole 160, and an electrolyte detecting portion 1221 (a body of an adsorption-expansion material) is circumferentially disposed on the second boss 163 and contacts the side wall of the relief hole above the explosion proof valve plate 121. The installation mode is stable, and the weight of the adsorption and expansion material body adsorbed with the electrolyte can be directly acted on the cover plate main body 110, so that adverse effects on the anti-explosion valve plate 121 are avoided.

Referring to fig. 6, in an example of the cover assembly 100 of the present utility model, the cover assembly 100 further includes a protection sheet 122, the protection sheet 122 is installed in the pressure relief hole 160 and is located at one side of the opening direction of the valve block 121, the protection sheet 122 covers the valve block 121 along the projection of the opening direction of the valve block 121, and the electrolyte detecting portion 1221 is disposed on the protection sheet 122 and is located on a surface of the protection sheet 122 facing away from the valve block 121. The arrangement mode not only can directly protect the explosion-proof valve plate 121, but also can directly detect whether the electrolyte reaches the protecting plate 122, and if necessary, only the protecting plate 122 needs to be replaced, and the electrolyte removing process for the explosion-proof valve plate 121 is not needed. It will be appreciated by those skilled in the art that the projection of the protection sheet 122 along the opening direction of the valve sheet 121 may also partially cover the valve sheet 121, but the protection effect may be slightly worse than the total coverage.

In the present utility model, the protective sheet 122 may be disposed in the pressure relief hole 160 in various manners, for example, a hanging tab may be disposed on the protective sheet 122, the protective sheet 122 is hung on a side wall of the pressure relief hole 160 and covers a side of the valve sheet 121 away from the electrode assembly, or the protective sheet 122 is directly disposed on the valve sheet 121, or the protective sheet 122 is adhered to a region outside or inside the notch of the valve sheet 121, but preferably, referring to fig. 6, in an example of the cover plate assembly 100 of the present utility model, a first boss 161 is disposed in the pressure relief hole 160 on the opening direction side of the valve sheet 121, and the protective sheet 122 is mounted on the first boss 161. The mounting of the guard 122 on the first boss 161 includes, but is not limited to, direct placement and bonding. In this embodiment, a first adhesive layer 123 is disposed between the protective sheet 122 and the first boss 161, and the adhesive strength of the first adhesive layer 123 is determined so as not to affect the opening of the anti-explosion valve sheet.

In an example of the cover plate assembly 100 of the present utility model, referring to fig. 6, the first boss 161 is formed around the inner wall of the pressure relief hole 160 to form a through hole 162, and a gap is provided between the protection sheet 122 and the anti-explosion valve sheet 121; the projection of the through hole 162 along the opening direction of the valve block 121 covers the notch 1211 on the valve block 121, and the protecting piece 122 is adhered to the first boss 161 and covers the through hole 162. The through hole 162 can provide a sufficient space for the opening of the explosion proof valve block 121. The protective sheet 122 may be directly placed on the first boss 161 without providing the first adhesive layer 123 between the protective sheet 122 and the first boss 161.

The protective sheet 122 may be a material capable of covering the surface of the anti-explosion valve sheet 121 to prevent the electrolyte or the deflagration substance from directly falling onto the surface of the anti-explosion valve sheet 121, and preferably, considering that the deflagration substance has a certain temperature, in this embodiment, the protective sheet 122 is made of a high temperature resistant material, for example, one of a mica sheet, a ceramic sheet and a high temperature resistant glass fiber sheet, or may be a composite protective layer formed by multiple kinds of mica sheets, ceramic sheets and high temperature resistant glass fiber sheets.

Referring to fig. 6 to 8, in an example of the cover assembly 100 of the present utility model, the cover assembly 100 further includes a transparent explosion-proof valve patch 125, the explosion-proof valve patch 125 is adhered to the cover main body 110 by a third adhesive layer 124 and covers an opening of a side of the pressure release hole 160 facing away from the explosion-proof valve sheet 121, and a gas channel is provided between the explosion-proof valve patch 125 and the pressure release hole 160. The formation mode of the gas channel is not limited, in an embodiment, a slit for passing gas is provided on the explosion-proof valve patch 125, the slit may be used for detecting the air tightness of the explosion-proof valve sheet 121, and the transparent explosion-proof valve patch 125 may block a part of the electrolyte, the deflagration spray material and the dust on one hand, and the transparent color may facilitate to observe the morphological change of the electrolyte detecting portion 1221 on the other hand. In other embodiments, the explosion-proof valve patch 125 may not be provided if the beneficial effects of the explosion-proof valve patch 125 are not considered.

In another embodiment of the cover assembly of the present utility model, the explosion-proof valve patch 125 may also be configured as a non-transparent structure, where the non-transparent explosion-proof valve patch 125 covers an opening of a side of the pressure release hole facing away from the explosion-proof valve sheet, and the electrolysis detection part 1221 is disposed between the explosion-proof valve patch 125 and the protection sheet 122 and configured to expand to push up the explosion-proof valve patch 125 after absorbing the electrolyte. The operator does not need to check the pressure relief hole 160, and can observe whether electrolyte enters the pressure relief hole 160 or not through the state of the explosion-proof valve patch 125, and the operation can be changed into the active operation. When the electrolyte detecting unit is configured to expand to push the explosion-proof valve patch after absorbing the electrolyte, the adhesive strength of the third adhesive layer 124, the explosion-proof valve patch strength, and the like should be considered.

Note that, when the electrolytic detection portion 1221 is disposed between the explosion-proof valve patch 125 and the protection sheet 122, and is configured to be expanded to push up the explosion-proof valve patch 125 after absorbing the electrolyte, the electrolytic detection portion 1221 may be disposed on a surface of the protection sheet 122 on a side facing away from the explosion-proof valve sheet 121, for example, as shown in fig. 6, or the electrolytic detection portion 1221 may be disposed on a surface of the explosion-proof valve patch 125 on a side facing toward the explosion-proof valve sheet 121, as shown in fig. 7; as shown in fig. 8, the electrolyte detecting unit 1221 may be provided on a side wall of the pressure release hole 160. In this way, a relatively stable support is required to be formed on the side of the electrolyte detecting portion 1221 facing away from the explosion-proof valve patch 125, so as to prevent adverse pressure from being applied to the explosion-proof valve sheet 121.

It should be noted that, when the electrolyte detecting portion is disposed on the surface of the protection sheet 122 facing away from the side of the explosion-proof valve sheet 121, the location and the manner of disposing the electrolyte detecting portion 1221 on the protection sheet 122 may be various, considering that when the electrolyte in the electrolyte injecting hole 130 overflows, the electrolyte flows into the pressure release hole 160 along the side wall closest to the electrolyte injecting hole 130, and referring to fig. 9 to 11, in an embodiment of the present utility model, the electrolyte detecting portion 1221 is configured to cover at least a part of the edge of the protection sheet 122 facing the side of the electrolyte injecting hole 130, or to surround the whole edge of the protection sheet 122 near the pressure release hole 160. However, if cost is not a factor, as shown in fig. 12 to 14, the entire surface of the protection sheet 122 on the side facing away from the explosion proof valve sheet 121 may be covered with the electrolyte solution detecting portion 1221.

In the present utility model, the electrolyte detecting unit 1221 may be attached to the protective sheet 122 in various ways, for example, by being adhered to or directly laid on the protective sheet 122. Referring to fig. 6, in an embodiment of the cover assembly 100 of the present utility model, a second adhesive layer 1222 is disposed between the electrolyte detecting portion 1221 and the protective sheet 122, so that the electrolyte detecting portion 1221 and the protective sheet 122 can be formed as a whole for easy installation and removal.

Referring to fig. 6 to 8, although the protection effect can be achieved by only partially covering the valve plate 121 with the projection of the protection plate 122 along the opening direction of the valve plate 121. However, in an embodiment of the cover plate assembly of the present utility model, the edge of the protection plate 122 at least abuts against the side wall of the pressure release hole 160 facing the side of the liquid injection hole 130, considering that the electrolyte entering the pressure release hole 160 is mainly overflowed when the electrolyte is injected. This can isolate the inflowing electrolyte from the explosion proof valve plate 121, thereby protecting it. In another embodiment of the cover assembly of the present utility model, the edge of the electrolyte detecting part 1221 abuts at least against the side wall of the pressure release hole 160 facing the side of the liquid injection hole 130. In this way, it is possible to not only quickly detect whether the electrolyte reaches a position close to the upper side of the explosion proof valve plate 121, but also absorb a part of the electrolyte through the electrolyte detecting part 1221 to protect the explosion proof valve plate 121. Preferably, in this embodiment, the edges of the protection sheet 122 and the electrolyte detecting portion 1221 are both in contact or approximately contact with the side wall of the pressure release hole 160, so that double protection can be performed.

The utility model also provides an electric device which comprises a working part and the electric core 1, wherein the working part is electrically connected with the electric core 1 to obtain electric energy support. The electric device may be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool, or the like. The vehicle can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle; spacecraft including airplanes, rockets, space planes, spacecraft, and the like; the electric toy includes fixed or mobile electric toys, such as a game machine, an electric car toy, an electric ship toy, and an electric airplane toy; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete shakers, and electric planers, among others. The embodiment of the application does not limit the electric device in particular.

In the cover plate assembly, the electrolyte detection part with the shape changed after being contacted with the electrolyte is arranged in the pressure relief hole at one side of the opening direction of the anti-explosion valve plate, when the electrolyte enters the pressure relief hole, whether the electrolyte pollutes the inside of the pressure relief hole or not can be judged by observing the shape change of the electrolyte detection part, and further measures can be taken when judging that the pollution is caused, so that the electrolyte is prevented from entering the pressure relief hole to corrode the anti-explosion valve plate. Further, the cover plate assembly further comprises a protective sheet and an explosion-proof valve patch, and the electrolyte detection part is arranged between the explosion-proof valve patch and the protective sheet and is configured to expand to push up the explosion-proof valve patch after absorbing electrolyte. An operator can observe whether electrolyte enters the pressure relief hole or not through the state of the explosion-proof valve patch without checking the pressure relief hole, and the pressure relief hole can be changed into a passive state; and the protective sheet is arranged in the pressure relief hole, so that the area is relatively small, the space can be saved, the weight can be reduced, and the cost can be saved. Therefore, the utility model effectively overcomes some practical problems in the prior art, thereby having high utilization value and use significance. The above embodiments are merely illustrative of the principles of the present utility model and its effectiveness, and are not intended to limit the utility model. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the utility model. Accordingly, it is intended that all equivalent modifications and variations of the utility model be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims (11)

1. A cover plate assembly, comprising:

the cover plate main body is provided with a through pressure relief hole;

the anti-explosion valve plate is fixedly arranged in the pressure relief hole;

the electrolyte detection part is exposed in the pressure relief hole at one side of the opening direction of the anti-explosion valve plate and is configured to change the shape after being contacted with electrolyte;

the protection piece, the protection piece sets up in the relief hole of explosion-proof valve block opening direction one side, electrolyte detection portion sets up the protection piece deviates from one side of explosion-proof valve block.

2. The cover plate assembly of claim 1, wherein the electrolyte sensing portion comprises a body of an adsorbing, expanding or corroding dissolution material.

3. The cover plate assembly of claim 2, wherein the electrolyte detection portion comprises an expanded leather and/or an expanded adhesive strip.

4. The cover plate assembly of claim 2, wherein the electrolyte sensing portion comprises an ink layer.

5. The cover plate assembly of claim 1, further comprising an explosion valve patch covering an opening in a side of the pressure relief aperture facing away from the explosion valve plate, the electrolyte detection portion configured to expand to jack the explosion valve patch after absorbing electrolyte.

6. The cover plate assembly according to claim 5, wherein the electrolyte detecting portion is provided on a surface of a side of the protective sheet facing away from the valve block or a surface of a side of the valve block close to the valve block; or on the side wall of the pressure relief hole.

7. The cover plate assembly of claim 5, wherein the explosion proof valve patch is transparent and a gas passage is provided between the explosion proof valve patch and the pressure relief hole.

8. The cover plate assembly of claim 1, wherein a boss is provided on a sidewall of the pressure relief hole, the guard tab being provided on the boss; the protective sheet comprises one or more of mica sheets, ceramic sheets and high-temperature resistant glass fiber sheets.

9. The cover plate assembly of claim 1, further comprising a fill port, wherein the electrolyte detection portion is in contact with at least an inner wall of the pressure relief port on a side of the fill port.

10. An electric core comprises a shell and an electrode assembly arranged in the shell; a cover plate assembly according to any one of claims 1 to 9.

11. An electrical device comprising a working portion, further comprising the electrical core of claim 10, wherein the working portion is electrically connected to the electrical core to obtain electrical energy support.