CN110391388B - Battery cover assemblies, single cells, battery modules, power batteries and electric vehicles - Google Patents

Abstract

The present disclosure relates to a battery cover plate assembly, a single cell, a battery module, a power battery and an electric vehicle. The battery cover plate assembly includes a cover plate, a first pole, a second pole, a flip part, a score and a The first conductive member, the first pole is electrically connected to the cover plate, the second pole includes an upper pole and a lower pole arranged at intervals, the upper pole and the lower pole are insulated and fixed on the cover plate, and the lower pole It is electrically connected to the battery core, and the scoring member is divided into a first scoring member and a second scoring member through the scoring on it. The first scoring member is electrically connected to the upper pole through the first conductive member, and the second scoring member is The trace piece is electrically connected to the lower pole post, the flip piece is connected to the first conductive piece, and the connection point of the first conductive piece and the second scribe piece is located at the connection point of the first conductive piece and the flip piece and the first conductive piece and the upper pole Between the connection points of the posts, the flipping piece is arranged on the cover plate and communicates with the internal gas of the battery. The flipping piece can flip and push the first conductive piece to move under the action of the internal air pressure of the battery to break the notch.

Description

Battery cover assemblies, single cells, battery modules, power batteries and electric vehicles

technical field

The present disclosure relates to the field of batteries, and in particular, to a battery cover plate assembly, a single battery including the battery cover plate assembly, a battery module including the single battery, a power battery including the battery module, and the power battery electric car.

Background technique

As an energy storage unit, batteries play an important role in all walks of life. For example, power batteries are widely used in new energy vehicles and other fields. The battery pack of the power battery can have a battery module composed of multiple single cells in series or in parallel to form a battery module. Realize the work of charging and discharging. Among them, during the charging and discharging process of the power battery, the state of charge is usually calculated by monitoring the changes of voltage and current through the BMS (battery management system). If there is a problem with the voltage sampling, it may cause the battery to be overcharged, especially for the ternary system, if the overcharge reaches a certain level, there will be a danger of the battery burning and exploding.

Existing technical solution: monitor the voltage and current of the battery, calculate the battery power by the current integration method and the open circuit voltage method, and control the charge and discharge management of the battery accordingly. However, there are also shortcomings, such as failure of battery voltage sampling or current sampling, or software failure, resulting in uncontrolled battery charging for a long time, especially in the case of charging pile charging, when the communication between the charging pile and the battery manager fails, overcharge Uncontrollable, the battery is overcharged to a certain extent, which will cause the battery to swell or even explode and catch fire.

In view of the above problems, the circuit breaking scheme and the short circuit protection scheme adopted in the prior art are:

In the circuit breaker scheme, the internal air pressure of the battery pushes the flip member to turn over and pulls off the notch member connected to it, so as to disconnect the battery cell from the pole to protect the battery cell. However, this scheme has drawbacks, because after the cell is disconnected, the entire circuit will be disconnected, the battery pack and the module will stop working, the pure electric vehicle may lose power output instantly, and there is a safety risk; in the short-circuit scheme, through the internal pressure of the battery Pushing the flipper to turn over makes the positive and negative electrodes short-circuited, so that the fuse set inside the cell is blown, thereby disconnecting the circuit to protect the cell. It may cause vaporization or other abnormalities of the electrolyte, etc., resulting in aggravation of abnormal changes inside the cell.

SUMMARY OF THE INVENTION

The purpose of the present disclosure is to provide a battery cover plate assembly, which can disconnect the electrical connection between the battery cell and the external circuit when the battery is abnormal, so as to prevent the battery from further thermally running out of control, resulting in swelling or even explosion and fire.

In order to achieve the above object, the present disclosure provides a battery cover plate assembly, which includes a cover plate, a first pole, a second pole, a flip part, a score part and a first conductive part, and the first pole is electrically connected In the cover plate, the second pole includes an upper pole and a lower pole arranged at intervals, the upper pole and the lower pole are both insulated and fixed on the cover, and the lower pole The column is electrically connected to the battery cell, the scoring piece is divided into a first scoring piece and a second scoring piece through the scoring on it, and the first scoring piece is electrically connected to the first scoring piece through the first conductive piece. The upper pole, the second scoring member is electrically connected to the lower pole, the flipping member is connected to the first conductive member, and the connection point between the first conductive member and the first scoring member is located at Between the connection point between the first conductive member and the flipping member and the connection point between the first conductive member and the upper pole, the cover plate includes a cover plate main body, and the flip member is arranged on the cover plate main body and communicate with the internal gas of the battery, the flipping member can flip and push the first conductive member to move under the action of the internal air pressure of the battery to break the notch, thereby disconnecting the upper pole and the lower pole electrical connection between.

Optionally, the distance between the connection point of the first conductive member and the first scoring member and the connection point of the first conductive member and the upper pole post is L ₁ , and the first conductive member The distance between the connection point between the element and the flip element and the connection point between the first conductive element and the upper pole is L ₂ , which satisfies L ₁ : L ₂ <1:2.

Optionally, the first conductive member is formed into an elongated sheet-like structure, one end of the first conductive member is electrically connected to the upper pole post, and the other end of the first conductive member is connected to the flip member connected.

Optionally, the cover plate further includes a second conductive member, the upper pole is insulated and fixed on the second conductive member, the second conductive member is electrically connected to the cover plate body, and the lower pole is electrically connected to the cover plate body. The pole is insulated and fixed to the cover plate body, and the first conductive member can move under the driving of the flip member to contact the second conductive member to form an electrical connection.

Optionally, the second conductive member is formed as a protective cover covering the lower pole, the flip member, the scoring member and the first conductive member.

Optionally, the second conductive member includes a top plate and a side wall plate extending downward from the edge of the top plate, the upper pole is insulated and embedded on the top plate, and the lower end of the side wall plate is electrically connected to the top plate. on the cover body.

Optionally, the first conductive member can be moved under the driving of the turning member to be in contact with the top plate.

Optionally, the battery cover plate assembly further includes an insulating column, and the turning member and the first conductive member are connected through the insulating column.

Optionally, the upper end of the insulating column is connected to the first conductive member, and the lower end of the insulating column is fixedly connected to the turning member.

Optionally, a groove structure is provided on the turning member, and the lower end of the insulating column is fitted in the groove structure.

Optionally, a first protrusion for contacting with the second conductive member is formed on the first conductive member.

Optionally, both the insulating column and the first protrusion are formed in a cylindrical shape, and the first protrusion and the insulating column are coaxially arranged.

Optionally, the cover plate body is provided with a through hole which is in communication with the gas inside the battery, and the turning member is covered on the through hole.

Optionally, a second protrusion is formed on the first scoring member, and the second protrusion is connected to the first conductive member.

Optionally, the score is disposed around the second protrusion.

Optionally, the score is formed in an oval shape.

Optionally, the scoring member is supported on the upper end of the lower pole, and the upper pole and the lower pole are not coaxial.

Optionally, the upper end of the lower pole column forms an annular concave platform supporting the scoring member, and the outer peripheral edge of the scoring component is fitted and fixed on the inner peripheral edge of the annular concave platform.

Through the above technical solution, when abnormal conditions such as overcharge occur in the battery, the temperature of the battery increases, the internal air pressure increases, and the flipping piece can be flipped under the action of the internal air pressure of the battery to break the notch, thereby disconnecting the battery cell from the external circuit to prevent further thermal runaway of the battery resulting in explosion and fire; and when the flipper uses the connection point between the first conductive member and the upper pole as a fulcrum to drive the first conductive member to move, the lever principle can be used to greatly reduce the The force required to break the notch, thereby reducing the size of the flip to accommodate smaller sized batteries, increases the versatility of the battery cover assembly.

According to another aspect of the present disclosure, a single battery is provided, including a battery case and a battery cell accommodated in the battery case, and further comprising the above-mentioned battery cover plate assembly, wherein the cover plate is used to encapsulate the battery case, so The lower pole and the battery are electrically connected through the inner lead.

According to another aspect of the present disclosure, a battery module is provided, the battery module includes a plurality of the above-mentioned single cells and a plurality of connecting pieces, one end of the connecting pieces is connected to a first pole of one of the single cells The column is electrically connected, and the other end of the connecting piece is electrically connected to the upper pole of the second pole of the other single battery.

According to another aspect of the present disclosure, a power battery is provided, including a package body and a battery module disposed in the package body, wherein the battery module is the above-mentioned battery module.

According to another aspect of the present disclosure, there is provided an electric vehicle including the above-mentioned power battery.

Other features and advantages of the present disclosure will be described in detail in the detailed description that follows.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present disclosure, and constitute a part of the specification, and together with the following detailed description, are used to explain the present disclosure, but not to limit the present disclosure. In the attached image:

1 is a partially exploded perspective view of a power battery in an embodiment of the present disclosure;

2 is a schematic cross-sectional view of a battery cover plate assembly in an embodiment of the present disclosure;

3 is a schematic cross-sectional view of a battery cover plate assembly in an embodiment of the present disclosure, wherein the first pole is not shown;

FIG. 4 is an enlarged schematic view of part A in FIG. 3 .

Description of reference numerals

1 Cover 11 Cover body

111 Through hole 12 Second conductive member

121 Top panel 122 Side panel

2 The first pole 3 The upper pole

4 Lower pole 5 Flip piece

51 Flanging 6 Scoring Pieces

61 First score 611 Second bump

62 Scoring 63 Second scoring piece

7 first conductive member 71 first protrusion

8 Insulation post 9 First insulation ring

10 Second insulating ring 100 Single battery

101 Battery case

L ₁ The distance between the connection point between the first conductive member and the first scoring member and the connection point between the first conductive member and the upper pole

L ₂ The distance between the connection point between the first conductive member and the flip member and the connection point between the first conductive member and the upper pole

Detailed ways

The specific embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure, but not to limit the present disclosure.

In the present disclosure, unless otherwise stated, the directional words used such as "up, down, left and right" are generally defined based on the drawing direction of the corresponding drawings, and "inside and outside" refer to Inside and outside of the corresponding part profile.

As shown in FIGS. 1 to 4 , the present disclosure provides a battery cover plate assembly, comprising a cover plate 1 , a first pole 2 , a second pole, a flip member 5 , a score member 6 and a first conductive member 7 , the first pole 2 is electrically connected to the cover plate 1, the second pole includes an upper pole 3 and a lower pole 4 arranged at intervals, and the upper pole 3 and the lower pole 4 are insulated and fixed on the cover plate 1, and The lower pole 4 is electrically connected to the cell, and the scoring member 6 is divided into a first scoring member 61 and a second scoring member 63 through the scoring member 62 thereon, and the first scoring member 61 is electrically connected through the first conductive member 7 . Connected to the upper pole 3, the second scoring member 63 is electrically connected to the lower pole 4, the flipping member 5 is connected to the first conductive member 7, and the connection point between the first conductive member 7 and the first scoring member 61 is located at the first Between the connection point between the conductive member 7 and the flip member 5 and the connection point between the first conductive member 7 and the upper pole 3, the cover plate 1 includes a cover plate main body 11, and the flip member 5 is arranged on the cover plate main body 11 and is connected to the inside of the battery. When the gas is connected, the inverting member 5 can be inverted under the action of the internal air pressure of the battery and push the first conductive member 7 to move to break the notch 62 , thereby disconnecting the electrical connection between the upper pole 3 and the lower pole 4 .

Wherein, one of the first pole 2 and the second pole is a positive pole, and the other is a negative pole. Optionally, the first pole 2 is a positive pole, the second pole is a negative pole, and the cover plate 1 and the first pole 2 are in direct electrical conduction. Under normal circumstances, the first pole 2 and the second pole carry out current input and output to complete the charge and discharge of the single battery 100 , while in an abnormal state, for example, when the battery is overcharged, the reversing member 5 And other related components respond quickly to interrupt the current input and current output of the battery, which plays a role in circuit breaker protection.

Through the above technical solution, when the battery has an abnormal condition such as overcharge, the temperature of the battery increases, and the internal air pressure increases, and the turning member 5 can be turned over under the action of the internal air pressure of the battery to break the notch 62, thereby disconnecting the battery from the battery. Electrical connections to external circuits to prevent further thermal runaway of the battery leading to explosion and fire.

Moreover, when the flipping member 5 is flipped under the action of the internal air pressure of the battery, the first conductive member 7 rotates with its connection point with the upper pole 3 as a fulcrum (that is, the first conductive member 7 performs a lever motion). The connection point between the first conductive member 7 and the first scoring member 61 is located between the connection point between the first conductive member 7 and the flip member 5 and the connection point between the first conductive member 7 and the upper pole 3 (ie, the lever fulcrum), so that the first The distance L1 between the connection point of a conductive member 7 and the first scoring member 61 and the connection point of the first conductive member 7 and the upper pole ₃ is smaller than the connection point of the first conductive member 7 and the flipping member 5 and the first The distance L ₂ between the conductive member 7 and the connection point of the upper pole 3 can greatly reduce the force required to break the notch 62 by leveraging the principle of leverage, so that the size of the flip member 5 can be reduced to accommodate smaller sizes the battery, thereby improving the versatility of the battery cover plate assembly.

Wherein, in order to make the turning member 5 drive the first conductive member 7 to move with a longer lever arm to reduce the force of breaking the notch 62, L ₁ and L ₂ can be set to satisfy L ₁ : L ₂ <1 : 2, in order to further reduce the force required to push the flipping member 5 and improve the sensitivity of the battery cover plate assembly to interrupt the current action.

Further, the first conductive member 7 can be formed into an elongated sheet-like structure, one end of the first conductive member 7 is connected to the upper pole 3, and the other end of the first conductive member 7 is connected to the flip member 5, so as to increase the force as much as possible. arm, thereby further reducing the force required to push the flip 5.

In one embodiment, as shown in FIG. 2 and FIG. 3 , the cover plate 1 further includes a second conductive member 12 , the upper pole 3 is insulated and fixed on the second conductive member 12 , and the second conductive member 12 is electrically connected to the cover On the plate main body 11 , the lower pole post 4 is insulated and fixed to the cover plate main body 11 , and the first conductive member 7 can move under the driving of the flipping member 5 to contact the second conductive member 12 to form an electrical connection.

When the inverting member 5 is flipped to break the notch 62 under the action of the internal air pressure of the battery, the electrical connection between the upper pole 3 and the lower pole 4 is disconnected; when the flipping member 5 is further flipped, the first conductive member 7 is driven to move to The first conductive member 7 is brought into contact with the second conductive member 12 , so that the upper pole 3 and the cover plate 1 are electrically connected. In this way, the upper pole 3 can be directly connected to the first pole 2 through the cover plate 1, so that the positive and negative poles of the single battery 100 are short-circuited, so as to serve as a wire in the entire circuit to avoid the occurrence of the entire power battery circuit. The sudden disconnection improves the safety of the car.

Among them, in order to ensure the reliability of the battery operation, avoid the occurrence of damage and failure of the scoring part 6, the flipping part 5, etc. due to accidental bumping or external environment corrosion. In one embodiment, as shown in FIG. 3 , the second conductive member 12 may be formed as a protective cover covering the lower pole 4 , the flipping member 5 , the scoring member 6 and the first conductive member 7 , so as to function as a protective cover. Reliable protection for the above-mentioned parts, especially effective protection for the scoring parts 6 .

Wherein, the second conductive member 12 may have any suitable structure and shape. In one embodiment, as shown in FIG. 3 , the second conductive member 12 may include a top plate 121 and a side wall plate 122 extending downward from the edge of the top plate 121 . The upper pole 3 is insulated and embedded on the top plate 121 , and the side wall The lower end of the plate 122 is electrically connected to the cover plate main body 11 . Optionally, the second conductive member 12 may be formed into a cylindrical shape, so as to facilitate processing and improve the structural aesthetics of the single battery 100 .

In this embodiment, the first conductive member 7 can move upwards under the driving of the flip member 5 to contact with the top plate 121 , so as to short-circuit the upper pole 3 and the first pole 2 .

In the present disclosure, as shown in FIG. 3 , the battery cover plate assembly further includes an insulating column 8 , and the flipping member 5 and the first conductive member 7 are connected through the insulating column 8 , so as to push the first conductive member 7 through the insulating column 8 , thereby pulling The broken notch 62 realizes the open circuit protection and short circuit connection of the battery.

Further, as shown in FIG. 3 , the upper end of the insulating column 8 is connected to the first conductive member 7 , and the lower end of the insulating column 8 is fixedly connected to the turning member 5 ; further, the turning member 5 is provided with a groove structure , the lower end of the insulating column 8 is fitted and fixed in the groove structure.

In the present disclosure, as shown in FIG. 3 , the first conductive member 7 is formed with a first protrusion 71 for contacting with the second conductive member 12 . Further, both the insulating column 8 and the first protrusion 71 may be formed into a cylindrical shape, and the first protrusion 71 is coaxially disposed with the insulating column 8 to further ensure that the first conductive member 7 can contact the second conductive member 12 in time.

In the present disclosure, as shown in FIG. 3 , the cover plate body 11 is provided with a through hole 111 that communicates with the gas inside the battery, and the turning member 5 covers the through hole 111 . 2 and FIG. 3, in one embodiment, the turning member 5 may include a bottom plate, a side wall extending obliquely upward from the edge of the bottom plate, and a flange 51 extending horizontally outward from the upper end of the side wall, The flange 51 is used to overlap on the cover body 11 . The flange 51 can be connected to the cover body 11 by welding, so as to prevent the turning element 5 from disengaging from the cover body 11 during the turning process, thereby ensuring the reliability of the battery disconnection protection.

In this embodiment, the reversing member 5 is sealed and covered on the through hole 111. On the one hand, the gas inside the battery can be prevented from overflowing from the through hole 111, and the effect of the gas on the reversing member 5 can be ensured. The marking member 6 is isolated from the interior of the battery, which can not only prevent the contact between the electrolyte inside the battery and the scoring member 6, and eliminate the risk of failure of the scoring member 6 caused by electrolyte corrosion, but also can reduce the damage caused by the electrolyte between the parts. The risk of creepage caused by pollution, thereby improving the reliability of related components during use.

In addition, as shown in FIG. 3 and FIG. 4 , a second protrusion 611 may be formed on the first scoring member 61, and the second protrusion 611 is connected to the first conductive member 7, so that the first conductive member 7 and the second conductive member 7 are connected to each other. There is a gap between the scoring members 63 to ensure the reliability of the circuit breaker protection, that is, to ensure that the second scoring member 63 and the first conductive member 7 are always in a non-contact state during the entire circuit breaker protection and short-circuit connection process of the battery, thereby Avoid electrical conduction between the upper pole 3 and the lower pole 4 during this process.

In the present disclosure, the lower pole 4 and the scoring member 6 may adopt any appropriate connection structure. In one embodiment, as shown in FIGS. 3 and 4 , the scoring member 6 is supported on the upper end of the lower pole 4 , and the upper pole 3 and the lower pole 4 are not coaxial. Specifically, the upper end of the lower pole post 4 forms an annular recess for supporting the scoring member 6, the scoring member 6 is formed into a circle, and the outer periphery of the scoring member 6 can be fixed on the inner periphery of the annular recess by welding or the like. . In other possible implementations, the upper pole 3 and the lower pole 4 may also be coaxial.

In the present disclosure, in order to facilitate breaking the score 62, the score 62 may be disposed around the second protrusion 611, and further, the score 62 may be formed in an oval shape. In this way, when subjected to the action of air pressure, due to the different curvatures of the contours, the area with greater curvature of the notch 62 is subjected to greater stress due to concentrated stress and can be torn first, thereby increasing the sensitivity of the notch 62 to be pulled off.

In the present disclosure, as shown in FIG. 3 , the battery cover plate assembly further includes a first insulating ring 9 and a second insulating ring 10 , and the upper pole 3 can be fixedly supported on the second conductive member 12 by the first insulating ring 9 , The lower pole 4 can be fixedly supported on the cover plate body 11 through the second insulating ring 10 .

The working principle and process of realizing open circuit protection and short circuit protection by the battery cover plate assembly according to an embodiment of the present disclosure will be briefly described below with reference to the accompanying drawings.

First, the internal air pressure of the battery pushes the inversion member 5 to turn over, the inversion member 5 drives the insulating column 8 to move upward, pushes the first conductive member 7 and pulls off the notch 62, thereby interrupting the electrical connection between the upper pole 3 and the cell.

Then, the flipping member 5 is further flipped to drive the first conductive member 7 to move upward to make the first protrusion 71 and the second conductive member 12 contact and conduct, thereby achieving short-circuit conduction between the upper pole 3 and the first pole 2 .

According to another aspect of the present disclosure, a single battery 100 is provided, which includes a battery case 101 and cells accommodated in the battery case 101, and also includes the above-mentioned battery cover plate assembly, where the cover plate 1 is used to encapsulate the battery case 101, The lower pole 4 and the cell are electrically connected through the inner lead.

According to another aspect of the present disclosure, a battery module is provided, the battery module includes a plurality of single cells 100 and a plurality of connecting pieces, one end of the connecting pieces is electrically connected to the first pole 2 of one single cell 100 , the other end of the connecting piece is electrically connected to the upper pole 3 of the second pole of another unit cell 100 .

According to another aspect of the present disclosure, a power battery is provided, including a package body and a battery module disposed in the package body, where the battery module is the aforementioned battery module.

According to another aspect of the present disclosure, there is provided an electric vehicle including the above-mentioned power battery.

The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings. However, the present disclosure is not limited to the specific details of the above-mentioned embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure. These simple modifications all fall within the protection scope of the present disclosure.

In addition, it should be noted that the various specific technical features described in the above-mentioned specific embodiments can be combined in any suitable manner unless they are inconsistent. In order to avoid unnecessary repetition, the present disclosure provides The combination method will not be specified otherwise.

In addition, the various embodiments of the present disclosure can also be arbitrarily combined, as long as they do not violate the spirit of the present disclosure, they should also be regarded as the contents disclosed in the present disclosure.

Claims (22)

1. A battery cover plate assembly, characterized in that it comprises a cover plate (1), a first pole (2), a second pole, a flipping member (5), a scoring member (6) and a first conductive member (7), the first pole (2) is electrically connected to the cover plate (1), the second pole includes an upper pole (3) and a lower pole (4) arranged at intervals, the The upper pole (3) and the lower pole (4) are both insulated and fixed on the cover plate (1), and the lower pole (4) is electrically connected to the battery core, and the scoring member (6) ) is divided into a first notch piece (61) and a second notch piece (63) by the notch (62) thereon, the first notch piece (61) passing through the first conductive piece (7) is electrically connected to the upper pole (3), the second indentation member (63) is electrically connected to the lower pole (4), the flip member (5) and the first conductive member (7) ) connection, the connection point between the first conductive member (7) and the first scoring member (61) is located at the connection point between the first conductive member (7) and the flipping member (5) and the first conductive member (7) Between the connection point with the upper pole (3), the cover plate (1) includes a cover plate main body (11), and the turning member (5) is arranged on the cover plate main body (11) and In communication with the internal gas of the battery, the flipping member (5) can flip and push the first conductive member (7) to move under the action of the internal air pressure of the battery to pull off the notch (62), thereby disconnecting the upper The electrical connection between the pole (3) and the lower pole (4). 2. The battery cover plate assembly according to claim 1, wherein the connection point between the first conductive member (7) and the first scoring member (61) and the first conductive member (7) ) and the connection point of the upper pole (3) is L ₁ , the connection point between the first conductive member (7) and the flip member (5) and the first conductive member (7) ) and the connection point of the upper pole (3) is L ₂ , which satisfies L ₁ : L ₂ <1:2. 3 . The battery cover plate assembly according to claim 1 , wherein the first conductive member ( 7 ) is formed into an elongated sheet-like structure, and one end of the first conductive member ( 7 ) is connected to the The upper pole (3) is electrically connected, and the other end of the first conductive member (7) is connected with the flip member (5). 4. The battery cover plate assembly according to claim 1, wherein the cover plate (1) further comprises a second conductive member (12), and the upper pole (3) is insulated and fixed on the second conductive member (12). On the conductive member (12), the second conductive member (12) is electrically connected to the cover plate main body (11), and the lower pole post (4) is insulated and fixed to the cover plate main body (11), so The first conductive member (7) can be moved under the driving of the turning member (5) so as to be in contact with the second conductive member (12) to form an electrical connection. 5. The battery cover plate assembly according to claim 4, characterized in that, the second conductive member (12) is formed to cover the lower pole (4), the turning member (5), the lower pole The scoring member (6) and the protective cover on the first conductive member (7). 6. The battery cover plate assembly according to claim 5, wherein the second conductive (12) member comprises a top plate (121) and a side wall plate (122) extending downward from the edge of the top plate (121) ), the upper pole (3) is insulated and embedded on the top plate (121), and the lower end of the side wall plate (122) is electrically connected to the cover plate body (11). 7 . The battery cover plate assembly according to claim 6 , wherein the first conductive member ( 7 ) can move under the driving of the turning member ( 5 ) so as to be in contact with the top plate ( 121 ). 8 . 8. The battery cover plate assembly according to claim 4, characterized in that, the battery cover plate assembly further comprises an insulating column (8), through which the turning member (5) and the first conductive member (7) pass The insulating posts (8) are connected. 9. The battery cover plate assembly according to claim 8, wherein the upper end of the insulating column (8) is connected to the first conductive member (7), and the lower end of the insulating column (8) It is fixedly connected to the turning element (5). 10 . The battery cover plate assembly according to claim 9 , wherein a groove structure is provided on the turning member ( 5 ), and the lower end of the insulating column ( 8 ) is fitted in the groove structure. 11 . . 11. The battery cover plate assembly according to claim 8, wherein a first protrusion (71) for contacting with the second conductive member (12) is formed on the first conductive member (7) . 12. The battery cover plate assembly according to claim 11, wherein the insulating column (8) and the first protrusion (71) are both formed in a cylindrical shape, and the first protrusion (71) It is arranged coaxially with the insulating column (8). 13. The battery cover plate assembly according to claim 1, wherein the cover plate body (11) is provided with a through hole (111) communicating with the gas inside the battery, and the turning member (5) covers the on the through hole (111). 14. The battery cover plate assembly according to claim 1, wherein a second protrusion (611) is formed on the first scoring member (61), and the second protrusion (611) is connected to the The first conductive member (7) is connected. 15. The battery cover plate assembly according to claim 14, wherein the notch (62) is arranged around the second protrusion (611). 16. The battery cover plate assembly of claim 15, wherein the notch (62) is formed in an oval shape. 17. The battery cover plate assembly according to claim 1, wherein the scoring member (6) is supported on the upper end of the lower pole (4), the upper pole (3) and the The lower pole (4) is not coaxial. 18. The battery cover plate assembly according to claim 17, wherein the upper end of the lower pole (4) forms an annular concave platform for supporting the scoring member (6), and the scoring member (6) ) on the inner periphery of the annular concave platform. 19. A single battery, comprising a battery casing (101) and a battery cell accommodated in the battery casing (101), characterized in that it further comprises the battery cover plate assembly according to any one of claims 1-18 , the cover plate (1) is used to encapsulate the battery casing (101), and the lower pole (4) and the battery core are electrically connected through inner lead-out parts. 20. A battery module, characterized in that the battery module comprises a plurality of single cells (100) as claimed in claim 19 and a plurality of connecting pieces, one end of the connecting pieces being connected to one of the single cells The first pole (2) of (100) is electrically connected, and the other end of the connecting piece is electrically connected to the upper pole (3) of the second pole of another single cell (100). 21. A power battery, comprising a package body and a battery module disposed in the package body, wherein the battery module is the battery module of claim 20. 22. An electric vehicle, characterized in that the electric vehicle comprises the power battery of claim 21.

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