CN218827739U

CN218827739U - Short-circuiting device of cover plate assembly, battery cover plate assembly and battery

Info

Publication number: CN218827739U
Application number: CN202222374619.1U
Authority: CN
Inventors: 焦晓朋; 江正福; 李娜; 扶梅
Original assignee: Shanwei Fudi Battery Co ltd; BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2022-09-07
Filing date: 2022-09-07
Publication date: 2023-04-07
Anticipated expiration: 2032-09-07

Abstract

The utility model discloses a short-circuiting device, battery apron assembly and battery of apron assembly, short-circuiting device includes: the base is provided with a groove; the first electric connecting piece is at least partially arranged in the groove; the elastic piece is arranged in the groove and abutted between the first electric connecting piece and the bottom wall of the groove, and the elastic piece is suitable for being deformed at a preset temperature so that the first electric connecting piece moves to one side far away from the groove. The elastic piece in the groove is heated by heat generated during battery overcharge, so that the elastic force generated by the elastic piece pushes the first electric connecting piece to move upwards, the first pole column and the second pole column are conducted, and charging is interrupted by triggering the fuse. In the process, the short-circuit device does not need to act by depending on the internal pressure of the battery generated by the overcharge of the battery, but induces the heat generated by the overcharge of the battery, thereby effectively improving the charging safety.

Description

Short-circuiting device of cover plate assembly, battery cover plate assembly and battery

Technical Field

The utility model belongs to the technical field of the apron assembly technique and specifically relates to a short circuit device, apron assembly and battery of apron assembly are related to.

Background

Overcharge of a lithium ion battery can cause risks of bursting, fire, explosion, and the like. A common solution to this is to mount explosion-proof valves and other safety devices, such as current shorting devices, on the battery. The explosion-proof valve can be opened when the internal pressure of the battery is too high so as to release the pressure of the battery; other safety devices such as current short-circuit device can utilize the upset piece to realize overcharge safety protection, and the upset piece upset down when the battery is normal, and when the pressure was too high in the battery, the upset piece can overturn up to make the battery short circuit, and then make the battery stop charging. Therefore, the turnover sheet can only play a role by triggering turnover due to high internal pressure of the battery caused by over-charging gas in the battery.

However, the internal gas production of the battery varies depending on the degree of overcharge of the battery and the temperature, and the higher the degree of overcharge, the higher the temperature, the greater the gas production, and the greater the internal pressure of the battery. When the internal pressure of the battery reaches the pressure at which the safety device can be activated, the internal temperature of the battery may already be high, which may result in failure to prevent further reaction of the internal materials of the battery at high temperature and subsequent safety problems such as thermal runaway of the battery.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a short-circuiting device of apron assembly, first electric connector can remove under the effect of elastic component to can couple together first utmost point post and second utmost point post electricity, thereby make the battery terminate when being in the overcharge state and charge.

The utility model also provides a battery apron assembly.

The utility model discloses a battery is further proposed.

According to the utility model discloses short circuit device of apron assembly of first aspect embodiment includes: the base is provided with a groove; a first electrical connector disposed at least partially within the groove; the elastic piece is arranged in the groove and abutted between the first electric connecting piece and the bottom wall of the groove, and the elastic piece is suitable for deforming at a preset temperature so that the first electric connecting piece moves to one side far away from the groove.

According to the utility model discloses short circuit device of apron assembly utilizes the elastic component in the heat heating recess that produces when the battery overcharges to make the elastic force that the elastic component produced promote first electric connector and remove, thereby make the battery short circuit. In the process, the short-circuit device does not need to act by depending on the internal pressure of the battery generated by the overcharge of the battery, but the first electric connecting piece moves under the action of the elastic force of the elastic piece in the groove by sensing the heat generated by the overcharge of the battery, so that the battery can be stopped to be charged when the battery is in a lower overcharge state, the safety problems of further reaction of materials in the battery at high temperature and subsequent thermal runaway and the like of the battery are avoided, and the charging safety is effectively improved.

According to some embodiments of the invention, the elastic member comprises: the hot melting part wraps the outer side of the elastic part and is suitable for melting at the preset temperature.

According to some embodiments of the present invention, the length of the elastic member extension is h, and h satisfies the relation: h is more than or equal to 1mm and less than or equal to 20mm.

According to some embodiments of the utility model, be provided with a plurality of recesses on the base, first electric connector with the elastic component is a plurality of, and is a plurality of the elastic component is a plurality of first electric connector is with a plurality of the recess one-to-one sets up.

According to some embodiments of the invention, the base is a thermally conductive base.

According to the utility model discloses battery apron assembly of second aspect embodiment includes: first utmost point post, second utmost point post and short-circuit device, the second utmost point post with first utmost point post opposite polarity, first electric connector with the second utmost point post electricity is connected, and is in under the predetermined temperature with the second utmost point post electricity is connected.

According to some embodiments of the present invention, the battery cover plate assembly further comprises: and the second electric connecting piece is arranged on the second pole column and is electrically connected with the second pole column, and the base is a conductive base and is abutted to the second electric connecting piece.

According to some embodiments of the present invention, the battery cover plate assembly further comprises: the insulating plate is arranged on one side of the cover plate, the first pole column is arranged on the cover plate and electrically connected with the cover plate, the short-circuit device is arranged on the insulating plate and electrically connected with the cover plate at a preset temperature, and the second pole column is arranged on the insulating plate.

According to some embodiments of the utility model, be provided with the through-hole on the apron, short-circuit device set up in the through-hole and with be formed with the clearance between the inner wall of through-hole, first electric connector sets up towards the apron under the predetermined temperature, elastic component deformation promotes first electric connector orientation the apron remove and with the apron electricity is connected.

According to the utility model discloses battery of third aspect embodiment includes: the battery cover plate assembly comprises a shell, a battery core and a battery cover plate assembly, wherein the shell is provided with a containing cavity and an opening communicated with the containing cavity, the battery core is arranged in the containing cavity, and the battery cover plate assembly is arranged at the opening.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural diagram of a battery cover plate assembly according to an embodiment of the present invention;

FIG. 2 is a partial schematic view A of FIG. 1;

fig. 3 is a schematic structural view of an elastic member according to an embodiment of the present invention.

Reference numerals:

100. a battery cover plate assembly;

10. a short-circuiting device; 11. a base; 111. a groove; 112. a second limiting part; 12. a first electrical connection; 13. an elastic member; 131. a heat-melting section; 132. an elastic portion;

20. a first pole column; 30. a second pole; 40. a second electrical connection; 50. a cover plate; 60. an insulating plate; 61. a first limiting part.

Detailed Description

Embodiments of the present invention are described in detail below, and the embodiments described with reference to the drawings are exemplary.

Referring to fig. 1-3, a short-circuit device 10 of a cover plate assembly according to an embodiment of the present invention is described, the present invention provides a battery cover plate assembly 100 having the above-mentioned short-circuit device 10, and the present invention further provides a battery having the above-mentioned battery cover plate assembly 100.

Referring to fig. 1 and 3, a short-circuiting device 10 according to an embodiment of the present invention includes: the first electric connector 12, the base 11 and the elastic piece 13, wherein the base 11 is provided with a groove 111, the first electric connector 12 is at least partially arranged in the groove 111, the elastic piece 13 is arranged in the groove 111, and the elastic piece 13 abuts between the first electric connector 12 and the bottom wall of the groove 111, and the elastic piece 13 is suitable for generating deformation at a preset temperature so as to enable the first electric connector 12 to move to the side far away from the groove 111. That is, the short circuit device 10 can operate in a state where the battery is overcharged, to trigger the fuse to interrupt charging by, for example, electrically connecting the first pole post 20 and the second pole post 30 to form a short circuit in an external circuit.

Wherein, the elastic element 13 is disposed in the groove 111 and abutted between the first electrical connector 12 and the base 11, and the elastic element 13 is adapted to deform at a predetermined temperature so as to move the first electrical connector 12 to a side away from the base 11. That is, the heat that produces when the battery overcharges makes elastic component 13 take place deformation to make first electric connector 12 remove, and then make first utmost point post 20 and second utmost point post 30 electron switch on, make the battery form the short circuit at the external circuit, and then trigger the fuse and interrupt charging, can make the battery stop work at lower overcharge state, improve the battery overcharge security better.

Also, the base 11 may be a conductive base 11, i.e., so that it can be electrically connected to the second pole post 30 through the base 11, which may be made of a conductive material, such as aluminum or stainless steel.

And, the shape of the groove 111 is not limited, and may be a cylindrical shape, a rectangular parallelepiped shape, a prismatic shape, etc., preferably a cylindrical shape, because the cylindrical first electrical connector 12 corresponding to the cylindrical groove 111 is more easily moved in the groove 111. The length of the groove 111 is not limited, and the width of the metal column of the groove 111 is not exceeded. The groove 111 may be of a bottom sealing type or a double-sided penetrating type.

Therefore, the elastic member 13 in the groove 111 is heated by the heat generated when the battery is overcharged, so that the elastic force generated by the elastic member 13 pushes the first electrical connector 12 to move upwards, thereby conducting the first pole 20 and the second pole 30, and interrupting the charging by triggering the fuse. In the process, the short-circuit device 10 does not need to act by depending on the internal pressure of the battery generated by the overcharge of the battery, but the first electric connecting piece 12 moves under the action of the elastic force of the elastic piece 13 in the groove 111 by sensing the heat generated by the overcharge of the battery, so that the battery can be stopped to be charged when the battery is in a low overcharge state, the safety problems of further reaction of materials in the battery at high temperature and thermal runaway of the battery caused by follow-up reaction are avoided, and the charging safety is effectively improved.

Referring to fig. 3, the elastic member 13 includes: the heat-fusible part 131 and the elastic part 132, the heat-fusible part 131 wrapping the outside of the elastic part 132, the heat-fusible part 131 being suitable for melting at a predetermined temperature. The elastic element 13 is low-melting point plastic and a compression spring sealed therein, the melting point of the low-melting point plastic is 50-100 ℃, for example, the low-melting point plastic is one or more of polycaprolactone plastic (PCL plastic) or ethylene-vinyl acetate copolymer plastic (EVA plastic), and the PCL plastic is preferred. Therefore, the lower the melting point of the low-melting-point plastic is, the earlier the melting can be performed, the earlier the short circuit between the first pole post 20 and the second pole post 30 is caused, the overcharge degree is reduced, and the overcharge safety of the battery is improved.

The bottom and the top of the compression spring are respectively in contact with the inner surface of the groove 111 and the inner surface of the first electric connector 12, the compression spring has no special requirement, and when the low-melting-point plastic is melted and loses the binding force on the compression spring, the compression spring can be normally expanded and pushes the first electric connector 12 out.

The elastic member 13 has an extended length h that satisfies the relationship: h is more than or equal to 1mm and less than or equal to 20mm. In order to ensure that the first electrical connector 12 is short-circuited with the cover plate 50 at the first time by pushing the first electrical connector 12 by the compression spring after the low-melting-point plastic in the heat melting part 131 is melted, the distance between the outer end face of the first electrical connector 12 and the cover plate 50 cannot be too large, but cannot be too small, so that the first electrical connector 12 is prevented from moving and being short-circuited accidentally due to an accidental situation, and therefore, the length h of the extension of the elastic member 13 is preferably between 2mm and 5 mm.

In addition, the length of the elastic element 13 in the groove 111 is 10-90%, preferably 30-70%, of the length of the groove 111, because the compression spring itself and the extension require a certain space, the shorter the compression spring, the smaller the extension length, the limited distance to push the first electrical connector 12, the longer the compression spring, the larger the extension length, the risk of pushing the first electrical connector 12 out of the groove 111, and therefore preferably 30-70%.

Referring to fig. 2, the base 11 is provided with a plurality of grooves 111, the first electrical connectors 12 and the elastic members 13 may be a plurality of ones, and the plurality of elastic members 13 and the plurality of first electrical connectors 12 are arranged in one-to-one correspondence with the plurality of grooves 111. So set up, set up a plurality of recesses 111 on base 11 to all set up elastic component 13 and first electric connector 12 in every recess 111, can promote the joint strength between base 11 and the apron 50 like this, namely, a plurality of first electric connector 12 can all be connected with first utmost point post 20 is electrically, and, like this can also be when base 11 is heated inhomogeneously, as long as there is the melting of arbitrary elastic component 13, just can realize the electric connection between base 11 and the first utmost point post 20, namely, can promote the fault-tolerance of short-circuiting device 10 like this.

Wherein, the base 11 may be a heat conducting base 11. That is, during the charging process, the first electrical connector 12 is usually installed to face the inside of the battery, and the heat generated by the charging is mainly transferred into the groove 111 through the base 11, so that it can be selected to have relatively good thermal conductivity, such as being made of metal, such as aluminum or stainless steel, so as to achieve good thermal conductivity at low cost, and ensure that the generated heat can be transferred to the elastic member 13 in the groove 111 in time in an overcharged state.

Of course, the first electrical connector 12 may be provided with a through hole, so that when the battery is overcharged, the high-temperature gas inside the battery enters the groove 111, and the hot melting portion 131 may be melted by the high-temperature gas, so as to release the compression spring.

The shorting device 10 may be used in a battery cover assembly 100 to operate when in a low overcharge state to terminate charging of the battery.

As shown in fig. 1 and 2, a battery cover plate assembly 100 according to an embodiment of the present invention includes: a first pole post 20, a second pole post 30 and a short-circuiting device 10, a first electrical connector 12 being electrically connected to the first pole post 20 and to the second pole post 30 at a predetermined temperature. Wherein the first pole post 20 and the second pole post 30 have opposite polarities.

In addition, the short-circuit device 10 is installed to enable the first electrical connector 12 to be electrically connected with the second pole 30 in an initial state, when the elastic part 13 in the groove 111 is partially melted by heat, the first electrical connector 12 protrudes towards two ends of the base 11 and is electrically connected with the first pole 20, so that the first pole 20 is electrically connected with the second pole 30, a short circuit is formed outside a battery, a fuse is triggered to interrupt charging, the power battery can be stopped charging when the power battery is in a low overcharge state, safety problems such as further reaction of materials inside the battery at a high temperature and battery thermal runaway caused subsequently are avoided, and charging safety is effectively improved.

It is understood that the short-circuiting device 10 of the present invention can also terminate the battery charging in other manners, such as providing a switch capable of controlling the start and stop of the charging at a position opposite to the first electrical connector 12, terminating the battery charging by triggering the switch after the first electrical connector 12 protrudes relative to the base 11, and so on.

As shown in fig. 1 and 2, the battery cover plate assembly 100 further includes: and a second electrical connector 40, wherein the second electrical connector 40 is arranged on the second pole 30, the second electrical connector 40 is electrically connected with the second pole 30, and the base 11 is abutted with the second electrical connector 40. As such, the second electrical connector 40 is an electrically conductive member, i.e., a portion of the second electrical connector 40 may be electrically connected with the second pole 30, and the base 11 may be electrically connected with the electrical connector, so that the first pole post 20 and the second pole post 30 may be selectively electrically connected together through the first electrical connector 12, the base 11, and the second electrical connector 40, thereby achieving a short circuit of the battery cover plate assembly 100 when the battery is overcharged.

As shown in fig. 1 and 2, the battery cover plate assembly 100 further includes: a cap plate 50 and an insulating plate 60, the insulating plate 60 being disposed at one side of the cap plate 50, the first pole post 20 being disposed at the cap plate 50 and electrically connected to the cap plate 50, the short circuit device 10 being disposed at the insulating plate 60 and electrically connected to the cap plate 50 at a predetermined temperature, and the second pole post 30 being disposed at the insulating plate 60. Wherein the cover plate 50 is covered over the insulating plate 60, and the cover plate 50 is electrically connected to the first pole post 20, and the base 11 is electrically connected to the second pole post 30 through the second electrical connector 40, so that the short-circuiting device 10 can selectively electrically connect the first pole post 20 and the second pole post 30. And, the second pole post 30 is disposed on the insulating plate 60 such that the second pole post 30 and the first pole post 20 are insulated from each other.

In the above embodiment, the first terminal post 20 and the second terminal post 30 are located on the same side, that is, the first terminal post 20 and the second terminal post 30 are disposed on the same battery cover assembly 100.

Of course, the first pole post 20 and the second pole post 30 may also be disposed at both ends of the battery. Specifically, the short circuit device 10 is selectively electrically connected to the cover plate 50 at one end thereof, wherein the cover plate 50 at one end is connected to the cover plate 50 at the other end thereof through the case, and the cover plate 50 at the other end is electrically connected to the first pole post 20, so that the selective electrical connection of the first pole post 20 and the second pole post 30 can be achieved through the cover plates 50 at both ends of the battery, the case, the short circuit device 10, and the second electrical connection member 40.

In addition, a through hole is arranged on the cover plate 50, the short-circuiting device 10 is arranged in the through hole, a gap is formed between the short-circuiting device 10 and the inner wall of the through hole, the first electric connecting piece 12 is arranged towards the cover plate 50, and at a preset temperature, the elastic piece 13 is deformed to push the first electric connecting piece 12 to move towards the cover plate 50 and be electrically connected with the cover plate 50. That is, the short-circuiting device 10 is placed on the insulating plate 60, and the groove 111 on the short-circuiting device 10 corresponds to the inner wall of the through hole, so that the first electrical connector 12 can protrude relative to the groove 111 under the action of the elastic element 13 and abut against the inner wall of the through hole, thereby achieving the electrical connection between the short-circuiting device 10 and the cover plate 50, and further achieving the electrical connection between the first pole post 20 and the second pole post 30.

One of the limiting protrusion and the limiting groove 111 is arranged on the second pole 30, the other one of the limiting protrusion and the limiting groove 111 is arranged on the electric connector, and the limiting protrusion is in limiting fit with the limiting groove 111, so that the electric connector and the second pole 30 can be electrically connected through the limiting fit of the limiting protrusion and the limiting groove 111.

Referring to fig. 2, a first limiting portion 61 is disposed on the second electrical connector 40 or the insulating plate 60, a second limiting portion 112 is disposed on the base 11, and the first limiting portion 61 and the second limiting portion 112 are in limiting fit. That is, the first stopper portion 61 is provided on the second electrical connector 40 or the insulating plate 60, and the second stopper portion 112 is provided on the base 11, so that the base 11 can be fixed between the insulating plate 60 and the second electrical connector 40 by the stopper fit between the first stopper portion 61 and the second stopper portion 112, thereby improving the structural stability of the battery cover plate assembly 100.

Specifically, the first limiting part 61 is one of a limiting protrusion and a limiting groove 111, the second limiting part 112 is the other of the limiting protrusion and the limiting groove 111, and the limiting protrusion and the limiting groove 111 are in limiting fit. That is, the base 11 can be fixed between the insulating plate 60 and the second electrical connector 40 by the limit fitting of the limit protrusion and the limit groove 111.

According to the utility model discloses battery of third aspect embodiment includes: shell, electric core and battery apron assembly 100, the shell have hold the chamber and with hold the opening of chamber intercommunication, electric core set up in holding the intracavity, the opening part is located to battery apron assembly 100 lid. Wherein, electric core setting is in the shell to electric core and relative setting of battery apron assembly 100 make the high temperature that produces when the battery overcharges directly transmit for short-circuit device 10 like this, thereby make hot melt portion 131 melt, so that elasticity portion 132 produces the elastic force, and butt first electric connector 12, make first electric connector 12 remove the back and electrically connect first utmost point post 20 and second utmost point post 30 through second electric connector 40, first electric connector 12 and apron 50, thereby with the battery short circuit, and then realize the overcharge-proof function of battery.

The short-circuiting device 10 provided by the present invention will be described in further detail below by way of specific experiments as an example and with reference to the accompanying drawings.

Experimental example 1: adopt metal aluminium an organic whole to make second electric connector 40 and base 11, base 11 contains 2 recesses 111, and recesses 111 are all cylindrical, and recess 111 diameter is 50% of apron 50 thickness. The elastic piece 13 in the groove 111 is PCL plastic and a compression spring enclosed therein, and the length of the elastic piece 13 accounts for 30% of the length of the groove 111. The first electrical connector 12 is a cylindrical steel rod, the outer end face of the first electrical connector 12 is 2mm away from the cover plate 50, and the novel short-circuit device 10 is marked with A1.

The lithium cobaltate is used as a positive electrode active material to manufacture a positive plate, the graphite is used as a negative electrode active material to manufacture a negative plate, the ceramic diaphragm is used as a diaphragm, the novel short-circuit device 10A1 is assembled into the cover plate 50, and the liquid is injected and packaged into the novel lithium ion battery S10.

Experimental example 2: adopt metal aluminium an organic whole to make second electric connector 40 and base 11, base 11 contains 1 recess 111, and recess 111 is the cylindric, and recess 111 diameter is the 80% of apron 50 thickness. The elastic element 13 in the groove 111 is PCL plastic and a compression spring enclosed therein, and the length of the elastic element 13 accounts for 50% of the length of the groove 111. The first electrical connector 12 is a cylindrical steel rod, the outer end face of the first electrical connector 12 is 5mm away from the cover plate 50, and the novel short-circuit device 10 is marked with A2.

The lithium cobaltate is used as a positive active material to manufacture a positive plate, the graphite is used as a negative active material to manufacture a negative plate, the ceramic diaphragm is used as a diaphragm, the novel short-circuit device 10A2 is assembled into the cover plate 50, and the liquid injection is packaged into the novel lithium ion battery S20.

Experimental example 3: adopt metal aluminium an organic whole to make second electric connector 40 and base 11, base 11 contains 1 recess 111, and recess 111 is the cylindric, and recess 111 diameter is the 80% of apron 50 thickness. The elastic piece 13 in the groove 111 is PCL plastic and a compression spring enclosed therein, and the length of the elastic piece 13 accounts for 70% of the length of the groove 111. The first electrical connector 12 is a cylindrical steel rod, the outer end face of the first electrical connector 12 is 2mm away from the cover plate 50, and the novel short-circuit device 10 is marked with A3.

The lithium cobaltate is used as a positive electrode active material to manufacture a positive plate, the graphite is used as a negative electrode active material to manufacture a negative plate, the ceramic diaphragm is used as a diaphragm, the novel short-circuit device 10A3 is assembled into the cover plate 50, and the liquid is injected and packaged into the novel lithium ion battery S30.

Comparative experimental example 1: the battery sample DS10 was produced by the method of example 1, except that the shorting device 10 used was a conventional flip chip.

The DS10 battery adopting the traditional turnover piece has the advantages that the circuit fuse is fused after the 40 th minute, so that the charging is stopped, but the internal short circuit of the battery is serious due to too high overcharge degree, the heat and the generated gas of the battery are continuously accumulated along with the continuous generation of the internal reaction of the battery, and finally the explosion-proof valve is opened at the 46 th minute and is ignited and exploded at the 47 th minute. And adopt novel short circuit device 10' S S10 battery, because the inside temperature of battery rises during overcharging for the temperature of mass collector and utmost point post rises, heat conduction to second electric connector 40 and base 11 makes the low melting point plastics melting in the elastic component 13 in the recess 111, and compression spring extends and promotes first electric connector 12 and removes and contact with apron 50, makes the external circuit short circuit of battery at 27 minutes, makes the fuse, the termination of charging.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and for simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A shorting device for a cover assembly, comprising:

the base is provided with a groove;

a first electrical connector at least partially disposed within the groove;

the elastic piece is arranged in the groove and abutted between the first electric connecting piece and the bottom wall of the groove, and the elastic piece is suitable for deforming at a preset temperature so that the first electric connecting piece moves to one side far away from the groove.

2. The short-circuiting device according to claim 1, wherein said elastic member includes: the hot melting part wraps the outer side of the elastic part and is suitable for melting at the preset temperature.

3. The shorting device for a cover plate assembly as claimed in claim 1, wherein the elastic member extends for a length h, h satisfying the relationship: h is more than or equal to 1mm and less than or equal to 20mm.

4. The short-circuiting device for a cover plate assembly according to claim 1, wherein a plurality of grooves are formed in said base, said first electrical connecting members and said elastic members are plural, and said plurality of elastic members and said plurality of first electrical connecting members are provided in one-to-one correspondence with said plurality of grooves.

5. The shorting device for a cover plate assembly as recited in claim 1 wherein the base is a thermally conductive base.

6. A battery cover plate assembly, comprising:

a first pole column;

the second pole column is opposite to the first pole column in polarity;

the short circuit device of a cover plate assembly of any one of claims 1-5, the first electrical connector being electrically connected to the second pole post and to the first pole post at the predetermined temperature.

7. The battery cover plate assembly of claim 6, further comprising: and the second electric connecting piece is arranged on the second pole column and is electrically connected with the second pole column, and the base is a conductive base and is abutted to the second electric connecting piece.

8. The battery cover plate assembly of claim 7, further comprising: the insulating plate is arranged on one side of the cover plate, the first pole column is arranged on the cover plate and electrically connected with the cover plate, the short-circuit device is arranged on the insulating plate and electrically connected with the cover plate at a preset temperature, and the second pole column is arranged on the insulating plate.

9. The battery cover plate assembly of claim 8, wherein the cover plate is provided with a through hole, the short circuit device is arranged in the through hole and forms a gap with the inner wall of the through hole, the first electrical connector is arranged towards the cover plate, and at the preset temperature, the elastic element deforms to push the first electrical connector to move towards the cover plate and to be electrically connected with the cover plate.

10. A battery, comprising:

a housing having a receiving cavity and an opening communicating with the receiving cavity;

the battery cell is arranged in the accommodating cavity;

the battery cover plate assembly of any of claims 6-9, disposed over the opening.