CN212625812U

CN212625812U - End cover assembly, battery monomer, battery and power consumption device

Info

Publication number: CN212625812U
Application number: CN202021400540.6U
Authority: CN
Inventors: 陈文伟; 杨剑雄
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2020-07-16
Filing date: 2020-07-16
Publication date: 2021-02-26
Anticipated expiration: 2030-07-16

Abstract

The application relates to an end cover assembly, a battery monomer, a battery and an electric device. An end cap assembly for a secondary battery includes an end cap, a seal assembly, and a fastener. The end cap is provided with a through hole for injecting electrolyte. The end cap has a connecting portion. The sealing assembly is used for sealing the through hole. The locking piece is configured to be movable relative to the connecting portion in the axial direction of the through hole, so as to realize switching between the locking state and the unlocking state of the locking piece and the connecting portion. When the locking state is realized, the orthographic projection of the through hole on the end cover is positioned outside the orthographic projection of the connecting position of the locking piece and the connecting part on the end cover. The locking member presses against the seal assembly to limit separation of the end cap from the seal assembly. In the unlocked state, the end cap is separable from the seal assembly to allow electrolyte to be injected from the through-hole. When the end cover assembly is applied to the single battery, the single battery can be conveniently replenished with electrolyte again, and the service life of the single battery is effectively prolonged.

Description

End cover assembly, battery monomer, battery and power consumption device

Technical Field

The application relates to the technical field of batteries, in particular to an end cover assembly, a battery monomer, a battery and an electric device.

Background

Because lithium ion batteries have the advantages of high energy density, high power density, multiple recycling times, long storage time and the like, the lithium ion batteries are widely applied to electric automobiles.

The secondary battery includes a case and an end cap assembly. The housing is used for containing electrolyte. The end cap assembly is connected to the housing. In the using process of the secondary battery, the secondary battery undergoes a plurality of charge and discharge cycles, so that the electrolyte is inevitably subjected to partial irreversible reaction consumption, and the using capacity of the secondary battery is reduced. If in the use of the secondary battery, electrolyte can be supplemented to the inside, the reduction degree of the capacity can be effectively slowed down, and the service life of the secondary battery is prolonged. However, in the prior art, the assembled secondary battery cannot be subjected to a fluid replacement operation, thereby affecting the service life of the secondary battery.

SUMMERY OF THE UTILITY MODEL

The application provides an end cover assembly, a battery monomer, a battery and an electric device. When the end cover assembly is applied to the single battery, the single battery can be conveniently replenished with electrolyte again, and the service life of the single battery is effectively prolonged.

In one aspect, the present application is directed to an end cap assembly for a secondary battery that includes an end cap, a seal assembly, and a locking member. The end cap is provided with a through hole for injecting electrolyte. The end cap has a connecting portion. The sealing assembly is used for sealing the through hole. The locking piece is configured to be movable relative to the connecting portion in the axial direction of the through hole, so as to realize switching between the locking state and the unlocking state of the locking piece and the connecting portion. When the locking state is realized, the orthographic projection of the through hole on the end cover is positioned outside the orthographic projection of the connecting position of the locking piece and the connecting part on the end cover. The locking member presses against the seal assembly to limit separation of the end cap from the seal assembly. In the unlocked state, the end cap is separable from the seal assembly to allow electrolyte to be injected from the through-hole.

According to an embodiment of one aspect of the present application, the locking member includes a connecting rod connected to the flange, the connecting rod being used for connecting the connecting portion, the connecting rod being spaced apart from the through hole in a radial direction of the through hole, and a flange configured to press the seal assembly in an axial direction.

According to one embodiment of one aspect of the present application, the connecting portion has a transfer hole to which the connecting rod is screwed to put the locking piece and the connecting portion in a locked state; or the locking piece further comprises a nut, and the part of the connecting rod penetrating out of the transfer hole is used for connecting the nut, so that the locking piece and the connecting part are in a locking state.

According to an embodiment of one aspect of the present application, the sealing assembly includes a stopper and a sealing member, the sealing member seals the through hole, at least a portion of the sealing member is disposed between the stopper and the end cap, and the locking member axially presses against the stopper to restrict the end cap from separating from the sealing assembly.

According to an embodiment of one aspect of the present application, the end cap further includes a body portion, and the connection portion is a boss protruding from a surface of the body portion.

According to an embodiment of one aspect of the application, the through hole penetrates through the connecting portion and the body portion along the axial direction of the through hole, the limiting member comprises a pressing plate and connecting plates, more than two connecting plates are arranged at intervals around the pressing plate, the pressing plate covers at least part of the sealing member and supports against the sealing member along the axial direction, and the locking member is connected with the connecting portion to support against the connecting plates along the axial direction.

According to one embodiment of one aspect of the application, the connecting portion comprises a columnar base body and connecting arms, the through holes penetrate through the columnar base body, the connecting arms are connected to the end portion, far away from the body portion, of the columnar base body, the positions and the number of the connecting plates and the positions and the number of the connecting arms are arranged in a one-to-one correspondence mode, and the locking pieces are used for being connected with the connecting arms.

According to an embodiment of one aspect of the present application, the through hole is located outside the connecting portion and axially penetrates through the body portion along the through hole, the limiting member includes a first plate body and a second plate body, the first plate body is located between the second plate body and the end cover, the first plate body has a first clamping portion, the second plate body has a second clamping portion, the first clamping portion and the second clamping portion clamp the connecting end portion of the sealing member located outside the through hole together along a radial direction of the through hole, and the locking member is connected with the connecting portion to axially press the first plate body and the second plate body.

According to an embodiment of one aspect of the present application, the connecting end portion has a receiving groove extending along a circumferential direction of the connecting end portion, a portion of the first clamping portion is inserted into the receiving groove, and a portion of the second clamping portion is inserted into the receiving groove.

According to one embodiment of one aspect of the present application, the first plate body has a first connection hole, the first connection hole and the first clamping portion are spaced apart in a radial direction, the second plate body has a second connection hole, the first connection hole and the second connection hole are correspondingly disposed in an axial direction, the second connection hole and the second clamping portion are spaced apart in the radial direction, and the connection portion is inserted into the first connection hole.

According to one embodiment of one aspect of the present application, the body portion has a bar-shaped groove, the through hole communicates with one end of the bar-shaped groove, and at least a part of the first clamping portion and the second clamping portion is received in the bar-shaped groove.

When the end cover assembly provided by the embodiment of the application is applied to a single battery, a predetermined amount of electrolyte can be injected into the single battery through the through hole, then the through hole is sealed by the sealing assembly, and finally the connecting part of the locking piece and the end cover is locked. After the battery cell is used for a preset time, the connecting part of the locking piece and the end cover is unlocked, and then the sealing assembly is taken away to open the through hole. And replenishing a predetermined amount of electrolyte into the battery cell through the through hole. After the electrolyte replenishing work is finished, the sealing assembly seals the through hole, and the connecting part of the locking piece and the end cover is locked. Therefore, after the battery cell is assembled, the electrolyte can be replenished again, and the service life of the battery cell is effectively prolonged.

In another aspect, the present application provides a battery cell including an end cap assembly as in the above embodiments.

In yet another aspect, the present application provides a battery including the battery cell according to the above embodiment.

In another aspect, the present application provides an electric device, which includes a battery cell as in the above embodiments, and the battery cell is used for providing electric energy.

Drawings

Features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic illustration of a vehicle according to an embodiment of the present disclosure;

fig. 2 is an exploded view of a battery according to an embodiment of the present disclosure;

fig. 3 is a partial structural view of a battery module according to an embodiment of the present disclosure;

fig. 4 is an exploded view of a battery cell according to an embodiment of the present disclosure;

FIG. 5 is a schematic top view of an end cap assembly according to an embodiment of the present disclosure;

FIG. 6 is an exploded schematic view of the end cap assembly of the embodiment of FIG. 5;

FIG. 7 is a schematic cross-sectional view taken along A-A of FIG. 5;

FIG. 8 is an enlarged schematic view at C of FIG. 7;

FIG. 9 is an enlarged schematic view at B in FIG. 6;

FIG. 10 is a schematic illustration of a top view of an end cap assembly according to another embodiment of the present disclosure;

FIG. 11 is an exploded view of the end cap assembly of the embodiment of FIG. 10;

FIG. 12 is an enlarged schematic view at E in FIG. 11;

FIG. 13 is a schematic cross-sectional view taken along line D-D of FIG. 10;

fig. 14 is an enlarged schematic view at F in fig. 13.

In the drawings, the drawings are not necessarily drawn to scale.

Description of the labeling:

1. a vehicle;

10. a battery;

20. a battery module;

30. a battery cell; 31. a housing; 32. an electrode assembly; 321. a main body portion; 321a, end faces; 322. a tab;

40. an end cap assembly;

50. an end cap; 50a, a through hole; 50b, electrode leading-out holes;

51. a connecting portion; 51a, a switching hole; 511. a columnar matrix; 512. a connecting arm;

52. a body portion; 521. a strip-shaped groove;

60. a seal assembly;

61. a limiting member;

611. pressing a plate;

612. a connecting plate; 612a, a mating hole;

613. a first plate body; 6131. a first clamping portion; 6132. a first connection hole;

614. a second plate body; 6141. a second clamping portion; 6142. a second connection hole;

62. a seal member; 621. a connecting end portion; 6211. accommodating grooves;

70. a locking member; 71. a connecting rod; 72. a flange; 73. a nut; 74. bonding blocks;

80. an electrode terminal;

90. a changeover member;

x, axial direction.

Detailed Description

Embodiments of the present application will be described in further detail below with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the application and are not intended to limit the scope of the application, i.e., the application is not limited to the described embodiments.

In the description of the present application, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like, indicate an orientation or positional relationship that is merely for convenience in describing the application and to simplify the description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the application. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. "vertical" is not strictly vertical, but is within the tolerance of the error. "parallel" is not strictly parallel but within the tolerance of the error.

In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood as appropriate by one of ordinary skill in the art.

The applicant has studied and analyzed the respective structures of the secondary battery after noticing the problems that the service life of the secondary battery is short and the secondary battery cannot be reused. The applicant has found that there is irreversible reaction consumption of the electrolyte of the secondary battery, resulting in a decrease in the service capacity of the secondary battery. Meanwhile, if the electrolyte can be supplemented, the reduction degree of the capacity of the secondary battery can be effectively slowed down. However, since the conventional secondary battery is structurally designed in consideration of safety, sealing, etc., the liquid replenishing operation cannot be performed on the assembled secondary battery.

Based on the above problems found by the applicant, the applicant has made improvements to the structure of the secondary battery, and the embodiments of the present application are further described below.

For a better understanding of the present application, embodiments of the present application are described below with reference to fig. 1 to 14.

The embodiment of the application provides a device using a battery cell as a power supply. The device may be, but is not limited to, a vehicle, a ship, an aircraft, or the like. Referring to fig. 1, one embodiment of the present application provides a vehicle 1 that includes a vehicle main body and a battery 10. The battery 10 is provided in the vehicle body. The vehicle 1 may be a pure electric vehicle, or a hybrid vehicle or a range-extending vehicle. The vehicle body is provided with a drive motor electrically connected to the battery 10. The battery 10 supplies electric power to the driving motor. The driving motor is connected with wheels on the vehicle body through a transmission mechanism, so that the automobile is driven to move. Alternatively, the battery 10 may be horizontally disposed at the bottom of the vehicle body.

Referring to fig. 2, the battery 10 may include more than two battery modules. In some alternative embodiments, battery 10 also includes a case. The battery module 20 is disposed in the case. Two or more battery modules 20 are arranged in a row in the case. The type of the case is not limited. The box body can be a frame-shaped box body, a disc-shaped box body or a box-shaped box body and the like. Alternatively, the case includes a lower case for accommodating the battery module 20 and an upper case covering the lower case. The upper case and the lower case are closed to form a receiving part for receiving the battery module 20. In other alternative embodiments, battery 10 includes a case and a plurality of battery cells disposed directly within the case. Alternatively, the battery 10 may also include one battery module 20.

Referring to fig. 3, the battery module 20 includes two or more battery cells 30. The battery module 20 is provided in various manners. In one embodiment, the battery module 20 includes a receiving part and two or more battery cells 30 located in the receiving part. Two or more battery cells 30 are arranged side by side in the housing portion. The accommodating part is arranged in various ways, for example, the accommodating part comprises a shell and a cover plate covering the shell; alternatively, the receiving portion comprises a side plate and an end plate which are sequentially connected in a surrounding manner; alternatively, the receiving portion includes two opposite end plates and a band surrounding the end plates and the battery cell 30.

Referring to fig. 4, a battery cell 30 of the embodiment of the present application includes a case 31 and an electrode assembly 32 disposed in the case 31. The housing 31 of the embodiment of the present application has a square structure or other shapes. The case 31 has an inner space accommodating the electrode assembly 32 and the electrolyte and an opening communicating with the inner space. The housing 31 may be made of a material such as aluminum, aluminum alloy, or plastic. The electrode assembly 32 of the embodiment of the present application may be formed by stacking or winding a first pole piece, a second pole piece, and a separator between the first pole piece and the second pole piece together, wherein the separator is an insulator between the first pole piece and the second pole piece. In this embodiment, the first electrode tab is exemplarily described as a positive electrode tab, and the second electrode tab is exemplarily described as a negative electrode tab. The positive electrode tab and the negative electrode tab each include a coated region and an uncoated region, the positive electrode tab active material is coated on the coated region of the positive electrode tab, and the negative electrode tab active material is coated on the coated region of the negative electrode tab. On the coated region, the active material is coated on a current collector formed of a thin metal foil, and on the uncoated region, the active material is not coated. After being wound or stacked, the electrode assembly 32 includes two tabs 322, i.e., a positive tab and a negative tab. The coated region of the positive electrode tab and the coated region of the negative electrode tab form a body portion 321. The uncoated regions of the positive electrode sheet are stacked to form the positive electrode tab, and the uncoated regions of the negative electrode sheet are stacked to form the negative electrode tab. In the embodiment of the present application, the main body 321 has two end surfaces 321a opposite to each other along the length direction, and the positive electrode tab and the negative electrode tab extend from the two end surfaces 321a opposite to each other along the length direction of the main body 321.

With continued reference to fig. 4, the battery cell 30 of the present embodiment further includes an end cap assembly 40 sealingly coupled to the housing 31. The end cap assembly 40 includes an end cap 50, an electrode terminal 80, and an adaptor member 90. The electrode terminal 80 is disposed on the end cap 50. The electrode terminal 80 may have a circular or square shape, but is not limited thereto. The electrode terminals 80 are electrically connected to the tabs 322 of the electrode assembly 32 through the transit member 90.

Referring to fig. 5, the battery cell 30 of the embodiment of the present application further includes a sealing assembly 60 and a locking member 70. A fastener 70 is coupled to the end cap 50 to secure the seal assembly 60. The sealing assembly 60 and the locking member 70 are spaced apart from the electrode terminal 80.

Referring to fig. 6, the end cap 50 of the embodiment of the present application is provided with a through hole 50a and an electrode lead-out hole 50 b. The through hole 50a is spaced apart from the electrode lead-out hole 50b in a radial direction of the through hole 50 a. The radial direction of the through hole 50a refers to a direction perpendicular to the axial direction X of the through hole 50 a. The electrolyte can be injected into the case through the through hole 50 a. The electrode lead-out hole 50b penetrates the end cap 50. Referring to fig. 7, the electrode terminal 80 is disposed on the end cap 50 and covers the electrode lead-out hole 50 b.

Referring to fig. 8, the end cap 50 has a connection portion 51. The seal assembly 60 is used to seal the through hole 50a on the end cap 50. The locking member 70 is configured to be movable relative to the connecting portion 51 of the end cover 50 in the axial direction X of the through hole 50a for switching between the locking state and the unlocking state of the locking member 70 and the connecting portion 51. When the locking member 70 and the connecting portion 51 are in the locked state, the orthographic projection of the through hole 50a on the end cover 50 is located outside the orthographic projection of the connecting position of the locking member and the connecting portion 51 on the end cover 50, that is, along the radial direction of the through hole 50a, and the orthographic projection of the through hole 50a on the end cover 50 is located on one side of the orthographic projection of the connecting position of the locking member and the connecting portion 51 on the end cover 50. The locking member 70 presses against the seal assembly 60 in the axial direction X of the through hole 50a to restrict the separation of the end cap 50 from the seal assembly 60. When the locking member 70 and the connection part 51 are in the unlocked state, the end cap 50 is detachable from the sealing assembly 60 to allow the electrolyte to be injected from the through hole 50 a.

When the end cap assembly 40 of the embodiment of the application is applied to the battery cell 30, a predetermined amount of electrolyte may be injected into the battery cell 30 through the through hole 50a, then the through hole 50a is sealed by the sealing assembly 60, and finally the locking member 70 is locked with the connecting portion 51 of the end cap 50. After the battery cell 30 is used for a predetermined time, the coupling part 51 of the locking member 70 and the end cap 50 is unlocked, and then the sealing member 60 is removed to open the through hole 50 a. A predetermined amount of electrolyte is replenished into the battery cell 30 through the through-hole 50 a. After the electrolyte replenishing operation is completed, the sealing member 60 is sealed in the through hole 50a to lock the locking member 70 with the connection portion 51 of the end cap 50. Thus, after the assembly of the single battery 30 of the embodiment of the present application is completed, the electrolyte can be replenished again, and the service life of the single battery 30 is effectively prolonged.

In one embodiment, as shown in FIG. 9, the fastener 70 includes a connecting rod 71 and a flange 72. The connecting rod 71 is connected to the flange 72. A flange 72 extends and projects from the outer peripheral surface of the connecting rod 71. The connection rod 71 of the locking member 70 is used to connect the connection portion 51. The flange 72 is configured to press against the seal assembly 60 in the axial direction X of the through hole 50a, thereby forming a restraining stop for the seal assembly 60 and reducing the possibility of the seal assembly 60 moving in the axial direction X to cause a seal failure of the seal assembly 60. In one example, the connecting rod 71 and the flange 72 are a unitary structure. In one example, the connection part 51 has a transfer hole 51 a. The transfer hole 51a is a screw hole. The connection rod 71 is threadedly coupled to the coupling hole 51a to place the locking member 70 and the connection portion 51 in a locked state. In another example, the locking member 70 further includes a nut 73. A portion of the connection rod 71 passes through the transfer hole 51 a. The portion of the connecting rod 71 that passes out of the transfer hole 51a is threaded. The portion of the connecting rod 71 that passes through the switch hole 51a is used to be screwed with the nut 73, so that the locking member 70 and the connecting portion 51 are in a locked state.

In one embodiment, referring to FIG. 9, a seal assembly 60 includes a retainer 61 and a seal 62. The through hole 50a is sealed by a seal 62. The stopper 61 presses the surface of the seal 62 away from the connecting portion 51. At least part of the seal 62 is disposed between the stop 61 and the end cap 50. The locking member 70 presses the stopper 61 in the axial direction X of the through hole 50a to restrict the separation of the end cap 50 from the seal assembly 60. After the liquid injection is completed through the through hole 50a, the sealing member 62 is first inserted into the through hole 50 a. The stopper 61 is then disposed on a side of the seal 62 away from the connection portion 51. Finally, the locking member 70 is connected to the connecting portion 51, and the locking member 70 presses the limiting member 61, so that the limiting member 61 applies a pressing force to the sealing member 62 to limit the sealing member 62 from moving in the axial direction X of the through hole 50a, so that the sealing member 62 and the through hole 50a maintain a sealed state. Optionally, the material of the seal 62 is plastic or rubber. In one example, referring to fig. 9, a portion of the seal 62 extends into the through-hole 50a and a portion is located outside the through-hole 50 a. The part of the sealing element 62 extending into the through hole 50a is in interference fit with the through hole 50a, and the part outside the through hole 50a covers the through hole 50a, so that the sealing performance of the sealing element 62 is improved.

In one embodiment, referring to FIG. 9, end cap 50 further includes a body portion 52. The connecting portion 51 is a projection protruding from the surface of the main body 52, so as to facilitate the connection between the locking member 70 and the connecting portion 51. The thickness of the end cover 50 at the position of the connecting part 51 is relatively thick, so that in the embodiment that the connecting part 51 is provided with the transfer hole 51a, when the transfer hole 51a is processed, the depth of the transfer hole 51a can be ensured to meet the requirement, the end cover 50 is not easy to penetrate through, and the structural strength and the integrity of the end cover 50 are ensured.

In one embodiment, referring to fig. 9, a through hole 50a penetrates the connection part 51 and the body part 52. The seal 62 is at least partially located on one side of the connecting portion 51 in the axial direction X of the through hole 50 a. The stopper 61 includes a pressing plate 611 and a connecting plate 612. Two connection plates 612 are spaced around the body portion 52. The pressing plate 611 covers at least part of the seal 62 and presses the seal 62 in the axial direction X of the through hole 50 a. Optionally, the pressure plate 611 covers the entire seal 62. The locking member 70 is connected to the connecting portion 51 to press the connecting plate 612 in the axial direction X of the through hole 50 a. In one example, the two connecting plates 612 are evenly distributed along the circumference of the pressure plate 611. It is understood that the number of the connection plates 612 is not limited to two, and may be three or more. In one example, the connection portion 51 includes a columnar base 511 and a connection arm 512. The through hole 50a penetrates the columnar base 511. The connecting arm 512 is connected to an end of the columnar base 511 remote from the body portion 52. The connecting arm 512 has a gap with the body portion 52 along the axial direction X of the through hole 50 a. The positions and the number of the connecting plates 612 are arranged in one-to-one correspondence with the positions and the number of the connecting arms 512. The locking member 70 is used to connect the connecting arm 512. Alternatively, the connection arm 512 is provided with a transfer hole 51 a. The connecting plate 612 is provided with a fitting hole 612 a. The fitting hole 612a and the transfer hole 51a are disposed corresponding to each other in position. The connection rod 71 of the locking member 70 passes through the fitting hole 612a and is connected to the through hole 51 a.

In one embodiment, FIG. 10 schematically illustrates another embodiment of an end cap assembly 40. FIG. 11 schematically illustrates a partial exploded view of the end cap assembly 40 of the embodiment of FIG. 10. Fig. 12 schematically shows an enlarged view at E in fig. 11. Referring to fig. 10 to 12, in the present embodiment, the same structure as that of the above embodiment is not repeated, and the differences are mainly described.

Referring to fig. 12, the through hole 50a is spaced apart from the connection portion 51 in a radial direction of the through hole 50 a. The through hole 50a is located outside the connection portion 51 and penetrates the body portion 52 in the self-axial direction X. The connection portion 51 has a transfer hole 51 a. The locking member 70 is connected to the through hole 51a to press the limiting member 61. The position-limiting member 61 includes a first plate 613 and a second plate 614. At least a portion of the first plate 613 is positioned between the second plate 614 and the end cap 50. The first plate body 613 and the second plate body 614 may be stacked in the axial direction X. The first plate 613 has a first clamping portion 6131, and the second plate 614 has a second clamping portion 6141. Along the radial direction of the through hole 50a, the first clamping portion 6131 and the second clamping portion 6141 are arranged side by side and jointly clamp the connecting end 621 of the sealing element 62 located outside the through hole 50a, so as to restrain and limit the sealing element 62. The first clamping portion 6131 and the second clamping portion 6141 jointly press against the sealing member 62 along the axial direction X of the through hole 50 a. The locking member 70 is connected with the connecting portion 51 to press the first plate 613 and the second plate 614 along the axial direction X of the through hole 50a, so that the locking member 70 performs a restraining and limiting function on the first plate 613 and the second plate 614.

In one embodiment, referring to fig. 12, the connecting end 621 of the seal 62 has a receiving groove 6211 extending in the circumferential direction of the connecting end 621. A part of the first clamping portion 6131 is inserted into the receiving groove 6211, and a part of the second clamping portion 6141 is also inserted into the receiving groove 6211, so that the sealing member 62 is not easy to fall off from between the first clamping portion 6131 and the second clamping portion 6141 along the axial direction X of the through hole 50a, the connection stability of the sealing member 62, the first clamping portion 6131 and the second clamping portion 6141 is improved, and the possibility that the sealing member 62 falls off from the through hole 50a is reduced.

In one embodiment, referring to fig. 12, the first plate 613 has a first coupling hole 6132. The first connection hole 6132 and the first clamping portion 6131 are arranged at intervals in the radial direction of the through hole 50 a. The second plate body 614 has a second coupling hole 6142. The second coupling hole 6142 and the second clamping portion 6141 are provided at intervals in the radial direction of the through hole 50 a. The first plate 613 is sleeved on the connecting portion 51 through the first connecting hole 6132. After the first plate 613 is sleeved on the connecting portion 51, the second plate 614 is mounted, and the second connecting hole 6142 of the second plate 614 corresponds to the first connecting hole 6132. The locking member 70 is coupled to the coupling portion 51 after passing through the second coupling hole 6142.

In one embodiment, referring to FIG. 12, the body portion 52 has a bar-shaped recess 521. The bar-shaped groove 521 is spaced from the connection portion 51 in the radial direction of the through hole 50 a. The through hole 50a communicates with one end of the bar-shaped groove 521. At least part of the first clamping portion 6131 and the second clamping portion 6141 are accommodated in the strip-shaped groove 521. The bar-shaped groove 521 may form a relief for facilitating the installation of the second board 614. After the first plate 613 is fitted over the connection portion 51, the sealing member 62 is installed. Then, the second clamping portion 6141 of the second plate body 614 is placed corresponding to the strip-shaped groove 521, and the second plate body 614 is moved along the radial direction of the through hole 50a, so that the second clamping portion 6141 clamps the connecting end portion 621 of the sealing member 62 and the second connecting hole 6142 corresponds to the first connecting hole 6132 in position. Finally, the locking member 70 is inserted through the second coupling hole 6142 and coupled to the coupling portion 51.

In one embodiment, referring to FIG. 12, the fastener 70 further includes an adhesive block 74. After the locking member 70 and the connecting portion 51 are completely connected, an adhesive is applied to the locking member 70 and the connecting portion 51 to form an adhesive block 74, so that the flange 72 of the locking member 70 is adhered to the connecting portion 51, and the connection stability of the locking member 70 and the connecting portion 51 is further improved.

Referring to fig. 13 and 14, a portion of the sealing member 62 is inserted into the through-hole 50a of the end cap 50 to seal the through-hole 50 a. Optionally, the seal 62 is an interference fit with the through hole 50 a. The first plate 613 and the second plate 614 are fastened to each other and form a receiving space for receiving the connection end 621 of the sealing member 62. The shape of the connecting end 621 matches the shape of the accommodating space, so that the connecting end 621 can be attached to the inner wall of the accommodating space formed by the limiting member 61.

In the end cap assembly 40 according to the embodiment of the present application, the through hole 50a for injecting the electrolyte is provided in the end cap 50, the sealing assembly 60 is used to seal the through hole 50a, and finally the locking member 70 is used to restrain and limit the sealing assembly 60. The locking member 70 is detachably connected to the connecting portion 51 formed on the end cap 50, so that when electrolyte needs to be supplied to the battery cell 30 using the end cap assembly 40, the locking member 70 can be conveniently and quickly separated from the connecting portion 51, the sealing assembly 60 can be taken away, and the electrolyte can be supplied through the through hole 50 a. After the electrolyte replenishing operation is completed, the sealing assembly 60 can be conveniently and quickly reinstalled in the through hole 50a, and then the locking member 70 is connected to the connection portion 51. Thus, after the assembly of the single battery 30 of the embodiment of the present application is completed, the electrolyte can be replenished again, and the service life of the single battery 30 is effectively prolonged.

While the present application has been described with reference to preferred embodiments, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the present application, and in particular, features shown in the various embodiments may be combined in any manner as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.

Claims

1. An end cap assembly for a secondary battery, comprising:

an end cap provided with a through hole for injecting an electrolyte, the end cap having a connection part;

a sealing assembly for sealing the through hole;

a locking piece configured to be movable relative to the connecting portion in an axial direction of the through hole, so as to switch between a locking state and an unlocking state, in the locking state, an orthographic projection of the through hole on the end cover is located outside an orthographic projection of a connecting position of the locking piece and the connecting portion on the end cover, and the locking piece presses against the sealing assembly to limit separation of the end cover and the sealing assembly; in the unlocked state, the end cap is separable from the seal assembly to allow the electrolyte to be injected from the through-hole.

2. The endcap assembly of claim 1, wherein the locking element includes a connecting rod and a flange, the connecting rod being connected to the flange, the connecting rod being adapted to connect to the connecting portion, the connecting rod being spaced from the through-hole in a radial direction of the through-hole, the flange being configured to press against the seal assembly in the axial direction.

3. The end cap assembly of claim 2, wherein:

the connecting part is provided with a transfer hole;

the connecting rod is in threaded connection with the switching hole so that the locking piece and the connecting part are in a locking state; or, the locking part further comprises a nut, and the part of the connecting rod penetrating out of the transfer hole is used for connecting the nut, so that the locking part and the connecting part are in the locking state.

4. The end cap assembly of claim 1, wherein the seal assembly includes a retaining member and a sealing member, the sealing member sealing the through-hole, at least a portion of the sealing member being disposed between the retaining member and the end cap, the locking member pressing against the retaining member in the axial direction to limit separation of the end cap from the seal assembly.

5. The end cap assembly of claim 4, wherein the end cap further comprises a body portion, and the connecting portion is a projection protruding from a surface of the body portion.

6. The end cap assembly of claim 5, wherein the through hole extends through the connecting portion and the body portion in the axial direction thereof, the retainer includes a pressing plate and a connecting plate, two or more of the connecting plates are spaced around the pressing plate, the pressing plate covers at least a portion of the sealing member and presses against the sealing member in the axial direction, and the locking member is connected to the connecting portion to press against the connecting plate in the axial direction.

7. The end cap assembly of claim 6, wherein the connecting portion includes a cylindrical base and connecting arms, the through hole penetrates through the cylindrical base, the connecting arms are connected to an end portion of the cylindrical base away from the body portion, positions and numbers of the connecting arms are in one-to-one correspondence with those of the connecting arms, and the locking member is configured to connect the connecting arms.

8. The end cap assembly of claim 5, wherein the through hole is located outside the connecting portion and extends through the body portion in the axial direction, the retaining member includes a first plate and a second plate, the first plate is located between the second plate and the end cap, the first plate has a first clamping portion, the second plate has a second clamping portion, the first clamping portion and the second clamping portion clamp the connecting end portion of the sealing member located outside the through hole in the radial direction of the through hole, and the locking member is connected to the connecting portion to press the first plate and the second plate in the axial direction.

9. The endcap assembly of claim 8 wherein said connecting end portion has a receiving slot extending circumferentially thereof, a portion of said first clip portion being inserted within said receiving slot and a portion of said second clip portion being inserted within said receiving slot.

10. The end cap assembly of claim 8, wherein the first plate has first connection holes, the first connection holes and the first clamping portion are spaced apart in the radial direction, the second plate has second connection holes, the first connection holes and the second connection holes are correspondingly spaced apart in the axial direction, the second connection holes and the second clamping portion are spaced apart in the radial direction, and the connection portions are plugged into the first connection holes.

11. The end cap assembly of claim 8, wherein the body portion has a strip-shaped recess, the through-hole communicates with an end of the strip-shaped recess, and at least a portion of the first and second clamping portions are received in the strip-shaped recess.

12. A battery cell comprising the end cap assembly of any one of claims 1 to 11.

13. A battery comprising the battery cell of claim 12.

14. An electric device comprising the battery cell of claim 12, wherein the battery cell is configured to provide electrical energy.