CN116799392A - Cover plate assembly and battery cell - Google Patents

Abstract

The invention provides a cover plate assembly and a battery cell. The cover plate assembly comprises an end cover, a pole and an overcurrent connecting piece, wherein the end cover is provided with overcurrent, the pole is arranged on the end cover in a penetrating mode and can move along a first direction relative to the end cover, the pole is connected with one end of the overcurrent, the overcurrent connecting piece is arranged on the end cover and is connected with the other end of the overcurrent, and the overcurrent connecting piece extends along the first direction and is used for connecting the pole lugs. The electrode post of the cover plate component is movable relative to the end cover, when the battery core is assembled to generate an external assembly gap, the external assembly gap can be made up only by adjusting the position of the electrode post relative to the end cover, the operation is simple, the time consumption is short, the assembly efficiency of the battery is improved, and the battery core is suitable for a complex assembly environment.

Description

Cover plate assembly and battery cell

Technical Field

The invention relates to the field of batteries, in particular to a cover plate assembly and a battery cell.

Background

The cell refers to an electrochemical cell containing a positive electrode and a negative electrode. The battery cell comprises a shell with a winding core and electrolyte arranged therein, and a cover plate assembly is arranged on the shell and comprises an end cover and a pole, and the pole is connected with a pole lug of the winding core to conduct current generated by the battery cell. In the related art, the pole is fixedly arranged on the end cover, when the battery cell is assembled in the battery box body, the pole can generate an external assembly gap, and the position of the battery cell in the battery box body needs to be adjusted at the moment, but the adjustment of the position of the battery cell needs to be tried for a plurality of times, and the occupied time is long, so that the assembly efficiency of the battery can be influenced.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, the embodiment of the invention provides a cover plate assembly, the pole of which is movable relative to the end cover, when the battery cell is assembled to generate an external assembly gap, the external assembly gap can be made up by only adjusting the position of the pole relative to the end cover, the operation is simple and the time consumption is short, thereby improving the assembly efficiency of the battery and enabling the battery cell to be suitable for a complex assembly environment.

The embodiment of the invention also provides a battery cell.

The cover plate assembly of the embodiment of the invention comprises:

an end cap having a flow through;

the pole is arranged on the end cover in a penetrating manner and can move along a first direction relative to the end cover, and the pole is connected with one end of the fluid;

the overcurrent connecting piece is arranged on the end cover and connected with the other end of the overcurrent, extends along the first direction and is used for connecting the lug.

According to the cover plate assembly, the terminal post capable of moving along the first direction is arranged on the end cover, so that the position of the terminal post relative to the end cover is adjustable, when an external assembly gap is generated in the assembly of the battery cell, the external assembly gap can be made up only by adjusting the position of the terminal post relative to the end cover, the operation is simple, the consumed time is short, the assembly efficiency of the battery is improved, and the battery cell is suitable for a complex assembly environment.

Meanwhile, the end cover is provided with an overcurrent connecting piece which extends along the first direction and is used for connecting the lug, so that a space for the pole to move is provided through the overcurrent connecting piece, and the pole is prevented from being blocked when moving. Meanwhile, the end cover is provided with overcurrent, and the overcurrent is connected between the pole and the overcurrent connecting piece, so that current generated by the battery core can always pass through the overcurrent connecting piece and the overcurrent and finally be conducted to the pole, and the position change of the pole is guaranteed not to influence the conduction of the current.

In some embodiments, the end cap has a connection hole extending therethrough in the first direction, the wall of the connection hole having internal threads;

the pole has a connection face around the first direction, the connection face having an external thread, the external thread being adapted to the internal thread.

In some embodiments, the end of the pole 2 away from the overcurrent connection 3 has at least two torsion planes, wherein the two torsion planes are spaced apart in a second direction, and the second direction is orthogonal to the first direction.

In some embodiments, the pole comprises:

the connecting column extends along the first direction and penetrates through the connecting hole, and the external threads of the connecting column are formed;

the end plate is arranged at one end of the connecting column, the end plate is located at one side, far away from the overcurrent connecting piece, of the end cover, the end plate is provided with the torsion plane, and the end plate is used for connecting the busbar.

In some embodiments, the end cover comprises an end cover body and an insulating layer, the end cover body is the overcurrent body, the insulating layer is arranged on the outer wall surface of the end cover body, and the pole and the overcurrent connecting piece respectively penetrate through the insulating layer and are connected with the end cover body; or alternatively

The overflow body is in a strip shape extending along a second direction, the second direction is orthogonal to the first direction, the overflow body is embedded in the end cover body or arranged on the surface of the end cover, one end of the overflow body is connected with the overflow connecting piece, and the other end of the overflow body is abutted to the pole.

In some embodiments, the cover plate assembly further comprises a current collecting disc, the current collecting disc and the end cover are arranged at intervals in the first direction, the overcurrent connecting piece is connected between the current collecting disc and the end cover, and the current collecting disc is used for connecting the lug;

the overcurrent connection piece is an elastic piece which can stretch along the first direction and is used for driving the current collecting disc to be away from the end cover.

In some embodiments, the plurality of the overcurrent connectors are arranged at intervals around the central line of the pole.

In some embodiments, the cover plate assembly further comprises a fluid replacement capsule, the interior of the fluid replacement capsule containing electrolyte, the fluid replacement capsule being disposed on the current collecting plate and between the current collecting plate and the end cap, the fluid replacement capsule being rupturable under pressure of the pole to release the electrolyte.

In some embodiments, the current collecting plate is configured to be disposed within a housing of the battery cell, the current collecting plate has a gap between an outer circumferential surface of the current collecting plate in the first direction and an inner wall surface of the housing, and/or the current collecting plate has a through hole penetrating the current collecting plate in the first direction.

The battery cell provided by the embodiment of the invention comprises a shell, a positive electrode cover plate and a negative electrode cover plate, wherein at least one of the positive electrode cover plate and the negative electrode cover plate is the cover plate assembly in any one of the embodiments, the end cover is arranged on the shell, and the overcurrent connecting piece is arranged in the shell.

The battery cell provided by the embodiment of the invention is provided with the cover plate assembly, so that when the battery cell is assembled to generate an external assembly gap, the external assembly gap can be made up by adjusting the position of the pole post relative to the end cover, the operation is simple, the time consumption is short, the assembly efficiency of the battery is improved, and the battery cell is suitable for a complex assembly environment.

In some embodiments, the housing extends along the first direction, one end of the housing is provided with the positive cover plate, and the other end of the housing is provided with the negative cover plate;

the cell further comprises:

the winding core extends along a first direction and is arranged in the shell;

the positive electrode tab is arranged at one end of the winding core and is connected with the current collecting disc of the positive electrode cover plate;

the negative electrode tab is arranged at the other end of the winding core, and is connected with the current collecting disc of the negative electrode cover plate, and the negative electrode tab and the positive electrode tab are all tabs.

Drawings

FIG. 1 is a front view of a portion of the structure of a cell according to an embodiment of the present invention;

fig. 2 is a cross-sectional view of a portion of the structure of the cell of fig. 1;

fig. 3 is a schematic structural diagram of a portion of the structure of the cell of fig. 1.

Reference numerals:

1. an end cap; 11. a connection hole; 2. a pole; 21. twisting the plane; 22. a connecting column; 23. an end plate; 3. an overcurrent connection; 4. a collecting tray; 41. a through hole; 5. a fluid supplementing capsule;

10. a housing; 20. a positive electrode cover plate; 30. and a negative electrode cover plate.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.

A cover plate assembly and a battery cell according to an embodiment of the present invention are described below with reference to fig. 1-3.

As shown in fig. 1-3, the cap plate assembly of the embodiment of the present invention includes an end cap 1, a collecting tray 4, and an overcurrent connection 3.

The end cap 1 has a flow through. The pole 2 is arranged on the end cover 1 in a penetrating way, and can move along a first direction (up and down direction as shown in fig. 1) relative to the end cover 1, and the pole 2 is connected with one end of the overflowing body. The overcurrent connecting piece 3 is arranged on the end cover 1 and is connected with the other end of the overcurrent, and the overcurrent connecting piece 3 extends along the first direction and is used for connecting the lugs.

In particular, as shown in the upper cover plate assembly of fig. 1-3, the end cap 1 is disposed in a horizontal direction and preferably circular, and the end cap 1 has a fluid passing therethrough. The pole 2 is arranged on the end cover 1 in a penetrating way and is connected with one end of the fluid, and the pole 2 can move up and down relative to the end cover 1. The overcurrent connecting piece 3 extends along the up-down direction, the upper end of the overcurrent connecting piece 3 is arranged on the end cover 1 and is connected with the other end of the overcurrent, the lower end of the overcurrent connecting piece 3 is used for connecting the lug, and the overcurrent connecting piece 3 and the pole 2 are distributed at intervals in the horizontal direction. Preferably, the lower end surface of the overcurrent connection member 3 is always located below the pole 2 to provide a space for the pole 2 to move up and down through the overcurrent connection member 3.

It will be appreciated that the lower end surface of the overcurrent connecting member is not limited to be always located below the pole, in other embodiments, the pole lugs and the pole posts are arranged at intervals in the horizontal direction, the pole lugs have a certain height in the up-down direction, the upper ends of the pole lugs are connected with the overcurrent connecting member, and the space for the pole posts to move up and down is provided by the height of the pole lugs in the up-down direction and the dimension of the overcurrent connecting member in the up-down direction together, so that when the pole posts move to the lowest position, the lower end surface of the pole posts is located below the overcurrent connecting member.

According to the cover plate assembly, the terminal post capable of moving in the up-down direction is arranged on the end cover, so that the position of the terminal post relative to the end cover is adjustable, when an external assembly gap is generated in the assembly of the battery cell, the external assembly gap can be made up only by adjusting the position of the terminal post relative to the end cover, the operation is simple, the consumed time is short, the assembly efficiency of the battery is improved, and the battery cell is suitable for a complex assembly environment.

Meanwhile, the end cover is provided with an overcurrent connecting piece which extends along the first direction and is used for connecting the lug, so that a space for the pole to move is provided through the overcurrent connecting piece, and the pole is prevented from being blocked when moving. Meanwhile, the end cover is provided with overcurrent, and the overcurrent is connected between the pole and the overcurrent connecting piece, so that current generated by the battery core can always pass through the overcurrent connecting piece and the overcurrent and finally be conducted to the pole, and the position change of the pole is guaranteed not to influence the conduction of the current.

In some embodiments, the end cap 1 has a connection hole 11 penetrating the end cap 1 in the first direction, and the wall surface of the connection hole 11 has an internal thread. The pole 2 has a connection surface around the first direction, the connection surface having an external thread, the external thread being adapted to the internal thread.

As shown in the upper cover plate assembly in fig. 1 to 3, the middle part of the end cover 1 is provided with a connecting hole 11 penetrating the end cover 1 in the up-down direction, the connecting hole 11 is a circular hole, and the wall surface of the connecting hole 11 is provided with internal threads. The lower end of the pole 2 is preferably cylindrical, the outer circumferential surface of the lower end of the pole 2 is a connecting surface and is provided with external threads, the lower end of the pole 2 is penetrated through the connecting hole 11, and the external threads are matched with the internal threads, so that the pole 2 can move up and down relative to the end cover 1 when being rotated.

It will be appreciated that the end cap and the pole are not limited to being connected by a threaded arrangement, and in other embodiments the end cap and the pole are slidably connected and the position of the pole is defined by a locating pin or locating boss.

In some embodiments, the end of the pole 2 remote from the overcurrent connection 3 has at least two torsion planes 21, wherein the two torsion planes 21 are spaced apart in a second direction (a direction orthogonal to the up-down direction as shown in fig. 1), and the second direction is orthogonal to the first direction.

As shown in the cover plate assembly at the lower end in fig. 3, the outer circumferential surface of the lower end of the pole 2 has torsion planes 21, preferably two torsion planes 21, which are arranged at intervals in a direction orthogonal to the center line of the pole 2, so that the clamping tool can rotate the pole 2 by clamping the two torsion planes 21, thereby facilitating the rotation of the pole 2 to adjust the position of the pole 2 with respect to the end cover 1.

It will be appreciated that the torsion plane is not limited to being provided on the outer peripheral surface of the post, and in other embodiments, the post is provided with a hexagonal hole on the end surface thereof that is away from the current collecting plate in the up-down direction, the hole wall surface of the hexagonal hole forming the torsion plane.

It will be appreciated that the pole is not limited to having a torsion plane, and in other embodiments the pole does not have a torsion plane.

In some embodiments, the pole 2 includes a connecting post 22 and an end plate 23. The connection post 22 extends in the first direction and is penetrated in the connection hole 11, and the connection post 22 has an external thread. An end plate 23 is provided at one end of the connecting post 22, and the end plate 23 is located on the side of the end cap 1 remote from the overcurrent connection 3, the end plate 23 being provided with a torsion plane 21, the end plate 23 being intended for connection to a busbar.

As shown in the upper cover plate assembly of fig. 1 to 3, the pole 2 includes a connection post 22 and an end plate 23, the connection post 22 extends in an up-down direction and is preferably cylindrical, an outer circumferential surface of the connection post 22 is a connection surface and is provided with external threads, the connection post 22 is inserted into the connection hole 11, and the external threads of the connection post 22 are adapted to the internal threads of the connection hole 11, so that the connection post 22 can move in an up-down direction relative to the end cover 1 when being rotated, and during the moving, a lower end surface of the connection post 22 can be located in the connection hole 11 or between a lower end surface of the overcurrent connection member 3 and the end cover 1. Preferably, the lower end surface of the cap 1 is provided with a protrusion provided with a portion of the connection hole 11 to increase the size of the connection hole 11 in the up-down direction by the protrusion, thereby improving the length of the connection of the cap 1 and the connection post 22 in the up-down direction, thereby improving the connection stability of the connection post 22.

The end plate 23 is provided at the upper end of the connection post 22, the end plate 23 is provided in the horizontal direction, and in a projection plane orthogonal to the up-down direction, the projection of the end plate 23 covers the projection of the connection post 22 so that the end plate 23 is always located above the end cap 1 and is used for connecting the bus bars. The end plate 23 is preferably circular, and the outer peripheral surface of the end plate 23 is provided with two torsion planes 21, and the two torsion planes 21 are arranged at intervals in the radial direction of the end plate 23.

It will be appreciated that the structure of the pole is not limited to having a connecting post and an end plate, and in other embodiments the pole has a connecting post without an end plate, with a torsion plane provided on the outer periphery of the connecting post.

In some embodiments, the end cap 1 comprises an end cap body and an insulating layer, the end cap body is a fluid, the outer wall surface of the end cap body is provided with the insulating layer, and the pole 2 and the overcurrent connection piece 3 respectively penetrate through the insulating layer and are connected with the end cap body.

Specifically, the end cover 1 includes end cover body and insulating layer, and the end cover body is equipped with the circular plate body of connecting hole 11, and the insulating layer is established on the outer wall surface of end cover body, and utmost point post 2 wears to establish in connecting hole 11 to offset with the pore wall surface of connecting hole 11, so that the electric current of end cover body conduction can flow to utmost point post 2 on, and the upper end of overcurrent connecting piece 3 passes the insulating layer that is located on the terminal surface under the end cover body to link to each other with the lower terminal surface of end cover body, so that the electric current of overcurrent connecting piece 3 conduction can flow to the end cover body.

In some embodiments, the overcurrent body is in a strip shape extending along a second direction, the second direction is orthogonal to the first direction, the overcurrent body is embedded in the end cover body or arranged on the surface of the end cover 1, one end of the overcurrent body is connected with the overcurrent connector 3, and the other end of the overcurrent body is abutted against the pole 2.

Specifically, the fluid passing body is a strip extending along the radial direction of the end cover 1, and can be a strip plate, a strip block or a strip lead, the fluid passing body can be embedded in the end cover body, and can also be arranged on the lower end surface of the end cover body, one end of the fluid passing body, which is positioned at the outer edge of the end cover 1, is connected with the upper end of the fluid passing connecting piece 3, one end of the fluid passing body, which is positioned at the inner edge of the end cover 1, is arranged on the hole wall surface of the connecting hole 11 and is propped against the pole post 2, further, a guide sleeve with internal threads can be arranged on the hole wall surface of the connecting hole 11, the pole post 2 is in threaded connection with the guide sleeve, a guide ring is arranged in the end cover 1 or on the lower end surface, the guide ring is arranged around the central line of the pole post 2, and is simultaneously connected with the upper ends of the fluid passing connecting pieces 3, and the fluid passing body is connected between the guide sleeve and the guide ring.

In some embodiments, the cover plate assembly of the embodiment of the present invention further includes a current collecting plate 4, the current collecting plate 4 and the end cap 1 are arranged at intervals in the first direction, the overcurrent connection member 3 is connected between the current collecting plate 4 and the end cap 1, and the current collecting plate 4 is used for connecting the tab.

As shown in the upper cover plate assembly of fig. 1 to 3, the collecting tray 4 is horizontally disposed below the end cap 1, and the overcurrent connector 3 is connected between the collecting tray 4 and the end cap 1 such that a space is formed between the collecting tray 4 and the end cap 1 before the collecting tray 4 and the space is used to provide a space for the pole 2 to move up and down, in other words, the pole 2 is always located above the collecting tray 4 when moving up and down. The current collecting disc 4 is used for connecting the lugs. So that the current generated by the battery core can always pass through the current collecting disc 4, the overcurrent connecting piece 3 and the overcurrent and finally be conducted to the pole 2, and the position change of the pole 2 is ensured not to influence the conduction of the current.

The current collecting disc 4 is convenient to connect with the electrode lugs, and the connection stability with the electrode lugs can be improved.

In some embodiments, the overcurrent connection 3 is an elastic member that is stretchable in a first direction for driving the current collecting tray 4 away from the end cap 1.

As shown in the cover plate assembly at the upper end in fig. 1-3, the overcurrent connecting piece 3 is a spring made of an overcurrent metal material, preferably a copper spring, so as to drive the current collecting disc 4 away from the end cover 1 through elastic force, in other words, drive the current collecting disc 4 to move downwards, so as to ensure that the current collecting disc 4 is always connected with the pole lug, and prevent the current collecting disc 4 from breaking off from the pole lug.

In some embodiments, the number of the overcurrent connectors 3 is plural, and the plurality of the overcurrent connectors 3 are arranged at intervals around the center line of the pole 2.

As shown in the upper cover plate assembly of fig. 1 to 3, the number of the overcurrent connectors 3 is preferably three, and the three overcurrent connectors 3 are arranged at intervals around the central line of the pole 2, so that the current collecting disc 4 maintains a stable posture, and the current collecting disc 4 is prevented from being inclined greatly. Simultaneously, the current on the current collecting disc 4 can flow to the end cover 1, and current interruption caused by damage of the overcurrent connecting piece 3 is avoided when only one overcurrent connecting piece 3 is arranged.

It will be appreciated that the number of the overcurrent connection is not limited to a plurality, and in other embodiments, the number of the overcurrent connection is only one, the overcurrent connection is arranged around the center line of the pole, and the inner diameter of the overcurrent connection is larger, so that the lower end of the pole can move up and down in the inner cavity of the overcurrent connection.

In some embodiments, the cover plate assembly of the embodiment of the present invention further includes a fluid-supplementing capsule 5, wherein the electrolyte is contained in the fluid-supplementing capsule 5, and the fluid-supplementing capsule 5 is disposed on the current collecting plate 4 and between the current collecting plate 4 and the end cover 1, and the fluid-supplementing capsule 5 can be ruptured under the pressure of the pole 2 to release the electrolyte.

As shown in the cover plate assembly at the upper end in fig. 1-3, the fluid-supplementing capsule 5 is arranged on the collecting disc 4 and is positioned in the interval space between the collecting disc 4 and the end cover 1, a certain distance is reserved between the upper end face of the fluid-supplementing capsule 5 and the lower end face of the end cover 1, so that a moving space for the pole 2 to make up an external assembly gap is provided, and when the pole 2 continues to move downwards, the pole can contact with the fluid-supplementing capsule 5 and press the fluid-supplementing capsule 5, so that the fluid-supplementing capsule 5 is broken, electrolyte in the fluid-supplementing capsule 5 is released, the supplement of the electrolyte is realized, and the service life of the battery cell is prolonged.

The lower end face of the pole 2 may be a plane, the pressure is applied to the fluid replacement capsule 5 through the lower end face to crush the fluid replacement capsule 5, the lower end of the pole 2 may also be a tip to puncture the fluid replacement capsule 5 under the pressure, and the lower end of the pole 2 may also be provided in a ring-shaped saw-tooth shape to cut the fluid replacement capsule 5 under the pressure and the rotation action of the pole 2.

In addition, when the electrolyte inside the electrolyte replenishing capsule 5 is insufficient to replenish the electrolyte required for the battery cell, the pole 2 may be screwed out of the connection hole 11 and inserted into an external electrolyte replenishing member through the connection hole 11 to replenish the electrolyte inside the battery cell through the electrolyte replenishing member.

It will be appreciated that the upper end face of the fluid replacement capsule is not limited to a distance from the lower end face of the end cap, and in other embodiments, the upper end face of the fluid replacement capsule abuts against the lower end face of the end cap, and the fluid replacement capsule has a certain elasticity, so that the deformation provides a moving space when the pole makes up for the external assembly gap, and when the pole continues to move downwards and breaks through the deformation limit of the fluid replacement capsule, the fluid replacement capsule breaks.

In some embodiments, the current collecting plate 4 is configured to be disposed within the housing 10 of the battery cell, and the current collecting plate 4 has a gap between an outer circumferential surface of the current collecting plate 4 around the first direction and an inner wall surface of the housing 10, and/or the current collecting plate 4 has a through hole 41 penetrating the current collecting plate 4 in the first direction.

As shown in fig. 2 and 3, the current collecting plate 4 is provided in the case 10 of the battery cell, and a gap is provided between the outer peripheral surface of the current collecting plate 4 and the inner wall surface of the case 10 so that the electrolyte in the electrolyte replenishing capsule 5 flows out of the space and toward the center of the case 10. The current collecting plate 4 is provided with through holes 41 penetrating the current collecting plate 4 in the up-down direction for flowing out of the space and toward the center of the case 10 with the electrolyte in the fluid replacement capsule 5, and preferably, the through holes 41 and the connection holes 11 are arranged at intervals in the up-down direction, which can penetrate the fluid replacement capsule 5 and enter into the through holes 41 during the movement of the pole 2, and when the pole 2 is retracted, the electrolyte in the fluid replacement capsule 5 flows out from the broken opening of the fluid replacement capsule 5 and flows toward the center of the case 10 through the through holes 41.

As shown in fig. 1 to 3, the battery cell according to the embodiment of the present invention includes a case 10, a positive electrode cap plate 20, and a negative electrode cap plate 30.

At least one of the positive electrode cap plate 20 and the negative electrode cap plate 30 is a cap plate assembly according to an embodiment of the present invention, the end cap 1 is provided on the housing 10, and the overcurrent connection member 3 is provided in the housing 10.

Specifically, as shown in fig. 1 to 3, the housing 10 has a cylindrical shape extending in the up-down direction, and the upper and lower ends of the housing 10 have openings, respectively, which communicate with the inner cavity of the housing 10. The positive electrode cap plate 20 and the negative electrode cap plate 30 are each preferably a cap plate assembly according to an embodiment of the present invention. The positive electrode cover plate 20 is arranged at the upper end of the shell 10, and the end cover 1 of the positive electrode cover plate 20 is connected with the upper end face of the shell 10 to close the upper end opening of the shell 10, preferably, the current collecting disc 4 and the overcurrent connecting piece 3 of the positive electrode cover plate 20 are arranged in the shell 10 and are positioned below the end cover 1 of the positive electrode cover plate 20. The negative electrode cover plate 30 is disposed at the lower end of the case 10, and the end cap 1 of the negative electrode cover plate 30 is connected with the lower end surface of the case 10 to close the lower end opening of the case 10, preferably, the current collecting plate 4 and the overcurrent connection member 3 of the negative electrode cover plate 30 are disposed in the case 10 above the end cap 1 of the negative electrode cover plate 30. So that the pole 2 of the positive electrode cover plate 20 and the pole 2 of the negative electrode cover plate 30 can move along the up-and-down direction to adjust the positions, thereby making up the external assembly gap, on one hand, the pole 2 of the positive electrode cover plate 20 or the pole 2 of the negative electrode cover plate 30 can be selectively adjusted according to the convenience of operation during assembly, and on the other hand, the pole 2 of the positive electrode cover plate 20 and the pole 2 of the negative electrode cover plate 30 can be adjusted, thereby making up the larger external assembly gap. Preferably, both the positive cover plate 20 and the negative cover plate 30 have a fluid replacement capsule 5.

The battery cell provided by the embodiment of the invention is provided with the cover plate assembly, so that when the battery cell is assembled to generate an external assembly gap, the external assembly gap can be made up by adjusting the position of the pole post relative to the end cover, the operation is simple, the time consumption is short, the assembly efficiency of the battery is improved, and the battery cell is suitable for a complex assembly environment.

In some embodiments, the housing 10 extends in the first direction, one end of the housing 10 is provided with a positive cover plate 20, and the other end of the housing 10 is provided with a negative cover plate 30.

The battery cell also comprises a winding core, a positive electrode lug and a negative electrode lug. The winding core extends in a first direction and is disposed within the housing 10. The positive electrode tab is arranged at one end of the winding core, and is connected with the current collecting disc 4 of the positive electrode cover plate 20. The negative electrode tab is arranged at the other end of the winding core, and is connected with the current collecting disc 4 of the negative electrode cover plate 30.

As shown in fig. 1 to 3, the battery cell in the embodiment of the present invention is a cylindrical battery cell, the casing 10 is a cylindrical casing extending in the up-down direction, the upper end of the casing 10 is provided with a positive electrode cover plate 20, and the lower end of the casing 10 is provided with a negative electrode cover plate 30.

A cylindrical winding core extending along the up-down direction is arranged in the shell 10, the upper end of the winding core is provided with an anode tab, the anode tab is connected with the current collecting disc 4 of the anode cover plate 20, the lower end of the winding core is provided with a cathode tab, and the cathode tab is connected with the current collecting disc 4 of the cathode cover plate 30.

It will be appreciated that the cell is not limited to a cylindrical cell, and in other embodiments, the cell is a rectangular cell, and the positive cover plate and the negative cover plate are disposed on the same end face of the cell housing, preferably, the end cap of the positive cover plate and the end cap of the negative cover plate are in an integral structure.

In some embodiments, the positive electrode tab and the negative electrode tab are all tabs, and the end surfaces of all tabs in the first direction are attached to the end surfaces of the corresponding current collecting plates 4 in the first direction.

Specifically, the positive electrode tab is a full tab, the lower end face of the positive electrode tab is connected with the upper end face of the winding core, and the upper end face of the positive electrode tab is bonded and welded with the lower end face of the current collecting disc 4 of the positive electrode cover plate 20, so as to ensure the connection stability of the positive electrode tab and the current collecting disc 4 of the positive electrode cover plate 20. The negative electrode tab is also a full tab, the upper end face of the negative electrode tab is connected with the lower end face of the winding core, and the lower end face of the negative electrode tab is bonded and welded with the upper end face of the current collecting disc 4 of the negative electrode cover plate 30, so that the connection stability of the negative electrode tab and the current collecting disc 4 of the negative electrode cover plate 30 is ensured.

In the description of the present invention, it should be understood that the terms "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between and not for indicating or implying a relative importance or an implicit indication of the number of features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., 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 invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While the above embodiments have been shown and described, it should be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives, and variations of the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the invention.

Claims (10)

1. A cover plate assembly, comprising:

an end cap (1), the end cap (1) having a flow through;

the pole column (2) is arranged on the end cover (1) in a penetrating mode, and can move along a first direction relative to the end cover (1), and the pole column (2) is connected with one end of the fluid;

the overcurrent connecting piece (3), the overcurrent connecting piece (3) is arranged on the end cover (1) and is connected with the other end of the overcurrent, and the overcurrent connecting piece (3) extends along the first direction and is used for connecting the lug.

2. The cover plate assembly according to claim 1, wherein the end cap (1) has a connection hole (11) penetrating the end cap (1) in the first direction, and a hole wall surface of the connection hole (11) has an internal thread;

the pole (2) has a connection surface around the first direction, the connection surface having an external thread, the external thread being adapted to the internal thread.

3. The cover plate assembly according to claim 2, wherein the end of the pole (2) remote from the overcurrent connection (3) has torsion planes (21), the number of torsion planes (21) being at least two, wherein the two torsion planes (21) are arranged at intervals in a second direction, which is orthogonal to the first direction.

4. A cover plate assembly according to claim 3, wherein the pole (2) comprises:

-a connecting post (22), the connecting post (22) extending in the first direction and being threaded inside the connecting hole (11), the connecting post (22) having the external thread;

end plate (23), end plate (23) are established the one end of spliced pole (22), just end plate (23) are located end cover (1) keep away from one side of excessive current connecting piece (3), end plate (23) are equipped with torsion plane (21), end plate (23) are used for connecting the busbar.

5. The cover plate assembly according to claim 1, wherein the end cap (1) comprises an end cap body and an insulating layer, the end cap body is the overcurrent body, the insulating layer is arranged on the outer wall surface of the end cap body, and the pole (2) and the overcurrent connecting piece (3) respectively penetrate through the insulating layer and are connected with the end cap body; or alternatively

The overflow body is in a strip shape extending along a second direction, the second direction is orthogonal to the first direction, the overflow body is embedded in the end cover body or arranged on the surface of the end cover (1), one end of the overflow body is connected with the overflow connecting piece (3), and the other end of the overflow body is abutted to the pole (2).

6. The cover plate assembly according to claim 1, further comprising a collecting tray (4), the collecting tray (4) and the end cap (1) being arranged at intervals in the first direction, the overcurrent connection (3) being connected between the collecting tray (4) and the end cap (1), the collecting tray (4) being for connecting a tab;

the overcurrent connection piece (3) is an elastic piece which can stretch along the first direction and is used for driving the current collecting disc (4) to be far away from the end cover (1).

7. The cover plate assembly according to claim 6, further comprising a fluid-filled capsule (5), the interior of the fluid-filled capsule (5) containing electrolyte, the fluid-filled capsule (5) being provided on the collecting tray (4) and between the collecting tray (4) and the end cap (1), the fluid-filled capsule (5) being rupturable under the pressure of the pole (2) to release the electrolyte.

8. The cover plate assembly according to claim 7, wherein the current collecting plate (4) is arranged in a housing (10) of the battery cell, and a gap is formed between the outer peripheral surface of the current collecting plate (4) in the first direction and the inner wall surface of the housing (10); and/or the collecting tray (4) has a through hole (41) penetrating the collecting tray (4) in the first direction.

9. The battery cell is characterized by comprising a shell (10), a positive electrode cover plate (20) and a negative electrode cover plate (30), wherein at least one of the positive electrode cover plate (20) and the negative electrode cover plate (30) is a cover plate assembly according to any one of claims 1-8, the end cover (1) is arranged on the shell (10), and the overcurrent connecting piece (3) is arranged in the shell (10).

10. The cell according to claim 9, wherein the housing (10) extends in the first direction, one end of the housing (10) being provided with the positive cover plate (20), the other end of the housing (10) being provided with the negative cover plate (30);

the cell further comprises:

a winding core extending in the first direction, the winding core being provided within the housing (10);

the positive electrode lug is arranged at one end of the winding core and is connected with the current collecting disc (4) of the positive electrode cover plate (20);

the negative electrode tab is arranged at the other end of the winding core and is connected with the current collecting disc (4) of the negative electrode cover plate (30), and the negative electrode tab and the positive electrode tab are all full tabs.