CN221009058U - Top cap subassembly and have its battery cell - Google Patents

Abstract

The utility model provides a top cap assembly and a battery cell with the same, wherein the top cap assembly comprises: the top cover is provided with a liquid injection channel penetrating through the top cover along the thickness direction of the top cover; the sealing rod is provided with a sealing boss protruding outwards along the radial direction of the sealing rod, the sealing rod penetrates through the liquid injection channel and can move relative to the top cover between an open position and a closed position, the liquid injection hole is communicated with the two side spaces of the top cover in the thickness direction in the open position, and the liquid injection hole is blocked by the sealing boss in the closed position; the elastic piece is connected between the sealing rod and the top cover and always pushes the sealing rod to move to the closing position. According to the top cover assembly, the sealing rod and the elastic piece are arranged in the liquid injection channel, and the liquid injection hole can be opened and closed without adding other components, so that the production cost can be reduced, the production efficiency is improved, and meanwhile, electrolyte can be filled into the battery cell for many times, so that the service life of the battery cell can be prolonged.

Description

Top cap subassembly and have its battery cell

Technical Field

The utility model relates to the technical field of battery cell manufacturing, in particular to a top cover assembly and a battery cell with the same.

Background

In the prior art, in the process of producing the battery monomer, electrolyte is required to be filled into the battery monomer, however, the electrolyte is easy to consume, and the injection hole is required to be sealed by the temporary glue nail during the production of the battery monomer, so that the production cost of the battery monomer is increased, and meanwhile, the plug operation step is increased by the temporary glue nail, so that the production efficiency is not improved.

Disclosure of utility model

The present utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the present utility model is directed to a top cap assembly that can reduce production costs.

The utility model also provides a battery cell with the top cover assembly.

An embodiment of the top cap assembly according to the first aspect of the present utility model includes: the top cover is provided with a liquid injection channel penetrating through the top cover along the thickness direction of the top cover; the sealing rod is provided with a sealing boss protruding outwards along the radial direction of the sealing rod, the sealing rod penetrates through the liquid injection channel and is movable relative to the top cover between an opening position and a closing position, the liquid injection hole is communicated with the spaces on two sides of the top cover in the thickness direction in the opening position, and the sealing boss seals the liquid injection hole in the closing position; the elastic piece is connected between the sealing rod and the top cover, and the elastic piece always pushes the sealing rod to move to the closing position.

According to the top cover assembly, the sealing rod and the elastic piece are arranged in the liquid injection channel, and the liquid injection hole can be opened and closed without adding other components, so that the production cost can be reduced, the production efficiency is improved, and meanwhile, electrolyte can be filled into the battery cell for many times, so that the service life of the battery cell can be prolonged.

According to some embodiments of the utility model, the sealing boss is located outside the liquid injection channel, and in the closed position, the sealing boss abuts against a peripheral edge of an outlet of the liquid injection channel.

According to some alternative embodiments of the utility model, the top cap assembly further comprises: the sealing gasket extends into a ring shape along the circumferential direction of the sealing rod, and is abutted between the sealing boss and the circumferential edge of the outlet of the liquid injection channel.

According to some alternative embodiments of the utility model, a concave accommodating groove is formed in a surface of one side of the sealing boss, which faces the liquid injection channel, and the sealing gasket is arranged in the accommodating groove.

According to some embodiments of the utility model, the top cover is provided with a liquid injection pipe part extending along the thickness direction of the top cover, the inner side of the liquid injection pipe part is defined with the liquid injection channel, and the elastic piece is sleeved on the sealing rod and is positioned on the radial inner side of the liquid injection pipe part.

According to some alternative embodiments of the present utility model, a radial dimension of an end of the liquid injection pipe portion toward the sealing boss is gradually reduced in a direction from an inlet toward an outlet of the liquid injection passage, and an end of the elastic member abuts against an inner wall surface of the end of the liquid injection pipe portion.

According to some embodiments of the utility model, the sealing rod is formed with a limiting boss, the limiting boss protrudes outwards along the radial direction of the sealing rod, the limiting boss is located in the liquid injection channel, and the other end of the elastic piece is connected with the limiting boss.

According to some optional embodiments of the utility model, a limiting plate is disposed on an inner wall surface of one end of the liquid injection pipe portion, which is away from the sealing boss, an inlet of the liquid injection channel penetrates through the limiting plate along a thickness direction of the limiting plate, and the limiting boss is located on one side of the limiting plate, which faces the sealing boss.

According to some optional embodiments of the utility model, in the closed position, the limit boss abuts against the limit plate, and the limit boss blocks the inlet of the liquid injection channel.

A battery cell according to an embodiment of a second aspect of the present utility model includes a case having a receiving cavity open at one side, and a cap assembly according to the first aspect of the present utility model, the cap assembly being capped at the open side of the receiving cavity.

According to the battery cell, through the arrangement of the top cover assembly in the first aspect, the sealing rod and the elastic piece are arranged in the liquid injection channel, and the opening and closing of the liquid injection hole can be realized without additionally arranging other components, so that the production cost can be reduced, the production efficiency can be improved, and meanwhile, the electrolyte can be filled into the battery cell for many times, so that the service life of the battery cell can be prolonged.

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

Drawings

Fig. 1 is a schematic view of a top cap assembly according to an embodiment of the present utility model;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

fig. 3 is a partial enlarged view at B in fig. 2.

Reference numerals:

100. a top cover assembly;

10. a top cover; 11. a liquid injection pipe portion; 111. a liquid injection channel; 112. a limiting plate; 12. a liquid injection hole;

20. a sealing rod; 21. sealing the boss; 22. a limit boss;

30. an elastic member;

40. A sealing gasket;

50. lower plastic;

60. A pole.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

First, a battery cell according to an embodiment of the second aspect of the present invention will be briefly described with reference to fig. 1 to 3, the battery cell including: the electrolyte is injected into the accommodating cavity of the shell through the liquid injection hole 12 of the top cover assembly 100, the top cover assembly 100 can seal the liquid injection hole 12, and the electrolyte is prevented from flowing out of the liquid injection hole 12.

A header assembly 100 according to an embodiment of the first aspect of the present utility model is described below with reference to fig. 1-3.

Referring to fig. 1, 2 and 3, a top cap assembly 100 according to an embodiment of the first aspect of the present utility model includes: top cap 10, sealing rod 20 and elastic member 30.

Specifically, the top cover 10 is formed with a liquid injection passage 111 penetrating the top cover 10 in the thickness direction of the top cover 10 (up-down direction as shown in fig. 3); the sealing rod 20 has a sealing boss 21 protruding outward in the radial direction of the sealing rod 20, the sealing rod 20 is provided penetrating the liquid injection passage 111, and the sealing rod 20 is movable with respect to the top cap 10 between an open position in which the liquid injection hole 12 communicates with both side spaces of the top cap 10 in the thickness direction, and a closed position in which the sealing boss 21 blocks the liquid injection hole 12; the elastic member 30 is connected between the sealing rod 20 and the top cover 10, and the elastic member 30 always pushes the sealing rod 20 to move to the closed position.

For example, as shown in fig. 3, a liquid injection channel 111 penetrating the top cover 10 in the vertical direction is formed in the top cover 10, a sealing rod 20 is cylindrically provided inside the liquid injection channel 111, a sealing boss 21 protruding outward in the radial direction of the sealing rod 20 is provided at the lower end of the sealing rod 20, the sealing boss 21 is ring-shaped, the lower end of the elastic member 30 abuts against the lower end of the liquid injection channel 111, and the upper end of the elastic member 30 abuts against the sealing rod 20. Preferably, the elastic member 30 is a spring, so that the elastic force of the elastic member 30 can be ensured, thereby ensuring that the liquid injection passage 111 can be normally opened and closed.

When the battery monomer does not need to be injected, the elastic piece 30 pushes the upper end of the sealing rod 20 to be abutted against the top cover 10, and the sealing boss 21 is abutted against the lower end of the injection channel 111, so that the sealing rod 20 seals the injection hole 12, and electrolyte cannot enter or flow out from the injection hole 12. When the battery cell needs to be filled with electrolyte, the upper end of the sealing rod 20 is pressed downwards, the sealing rod 20 moves downwards, the elastic piece 30 is compressed, the sealing rod 20 moves downwards to drive the sealing boss 21 to move downwards, the electrolyte filling hole 12 is opened, and the electrolyte can be filled into the shell from the electrolyte filling hole 12. Electrolyte enters the liquid injection hole 12 from the liquid injection channel 111, then the electrolyte flows from the liquid injection hole 12 to the sealing boss 21, and the electrolyte flows into the accommodating cavity from the periphery of the sealing boss 21 under the action of the sealing boss 21.

After the electrolyte is filled, the upper end of the sealing rod 20 is not pressed any more, the elastic member 30 releases the elastic force, the elastic member 30 pushes the sealing rod 20 to move upwards until the sealing boss 21 abuts against the top cover 10 and closes the filling hole 12, at this time, the elastic member 30 is not deformed any more, and the sealing rod 20 stops moving.

According to the top cover assembly 100, the sealing rod 20 and the elastic piece 30 are arranged in the liquid injection channel 111, the sealing rod 20 and the elastic piece 30 form the one-way valve, when electrolyte is required to be injected into the shell, the sealing rod 20 is pressed downwards, the liquid injection hole 12 is communicated with the outside, the electrolyte can be injected into the accommodating cavity, when the electrolyte is not required to be injected into the accommodating cavity, the elastic piece 30 automatically drives the sealing rod 20 to move and seals the liquid injection hole 12, compared with the scheme that a temporary rubber plug is required to temporarily seal the liquid injection hole 12 in the production process of a battery monomer in the prior art, the top cover assembly 100 of the embodiment can realize the opening and closing of the liquid injection hole 12 without manual operation, so that the production cost can be reduced, the production efficiency is improved, and meanwhile, the electrolyte can be injected into the battery monomer for many times by pressing the sealing rod 20, so that the service life of the battery monomer can be prolonged. In addition, the sealing boss 21 arranged on the sealing rod 20 can adjust the direction of the electrolyte entering the accommodating cavity, and the electrolyte can not directly vertically enter the liquid to wash the pole group to damage the pole group, so that the service life of the battery cell can be further prolonged.

According to the top cap assembly 100 of the embodiment of the present utility model, the sealing rod 20 and the elastic member 30 are disposed in the liquid injection passage 111, and the opening and closing of the liquid injection hole 12 can be achieved without adding other members, so that the production cost can be reduced, the production efficiency can be improved, and simultaneously, the electrolyte can be injected into the battery cell several times, so that the service life of the battery cell can be increased.

According to some embodiments of the present utility model, referring to fig. 2 and 3, the sealing boss 21 is located outside the liquid injection passage 111, and in the closed position, the sealing boss 21 abuts against the peripheral edge of the outlet of the liquid injection passage 111. In this way, in the closed position, it is ensured that the sealing boss 21 is able to completely close the outlet of the liquid injection channel 111, preventing the electrolyte from flowing out of the outlet of the liquid injection channel 111.

For example, as shown in fig. 3, the outlet of the liquid injection channel 111 is provided at the lower end of the liquid injection channel 111, the outlet of the liquid injection channel 111 is circular, the sealing boss 21 is provided at the lower side of the outlet of the liquid injection channel 111, the protruding length of the sealing boss 21 in the radial direction is larger than the radius of the outlet of the liquid injection channel 111, and in the closed position, the sealing boss 21 can be ensured to be capable of closing the outlet of the liquid injection channel 111.

Referring to fig. 2 and 3, according to some embodiments of the present utility model, the top cap assembly 100 may further include: the gasket 40, the gasket 40 extends in a ring shape along the circumferential direction of the seal rod 20, and the gasket 40 abuts between the seal boss 21 and the circumferential edge of the outlet of the liquid injection passage 111. In this way, the gasket 40 can further seal the sealing boss 21 and the peripheral edge of the outlet of the liquid injection passage 111, so that the electrolyte can be effectively prevented from flowing out from the sealing boss 21 and the peripheral edge of the outlet of the liquid injection passage 111.

For example, as shown in fig. 3, the gasket 40 is sleeved on the radial outer side of the sealing rod 20, so that the sliding of the gasket 40 relative to the sealing rod 20 can be effectively prevented, and the sealing effect of the gasket 40 can be ensured.

According to some alternative embodiments of the present utility model, referring to fig. 2 and 3, a side surface of the sealing boss 21 facing the liquid injection passage 111 (an upper side surface of the sealing boss 21 shown in fig. 3) is provided with a recessed receiving groove, and the gasket 40 is provided in the receiving groove. Thus, the seal groove can limit the gasket 40, and further prevent the gasket 40 from sliding relative to the seal rod 20.

For example, as shown in fig. 3, the accommodating groove is formed by recessing from top to bottom, and extends radially outward along the radial inner portion of the sealing boss 21, but the accommodating groove is not provided at the end portion of the sealing boss 21, so that a flange-like structure is formed at the end portion of the sealing boss 21, so that the sealing gasket 40 can be firmly clamped inside the accommodating groove, and sliding of the sealing gasket 40 relative to the sealing rod 20 is effectively prevented.

According to some embodiments of the present utility model, referring to fig. 2 and 3, the top cap 10 has a liquid injection pipe portion 11 extending in a thickness direction (up-down direction as shown in fig. 3) of the top cap 10, and an inner side of the liquid injection pipe portion 11 defines a liquid injection passage 111 such that the liquid injection pipe portion 11 defines a direction of the liquid injection passage 111 to thereby define a flow direction of an electrolyte within the liquid injection passage 111, and at the same time, the liquid injection pipe portion 11 can prevent other objects from entering into the liquid injection passage 111, and can prevent the liquid injection passage 111 from being blocked. The elastic member 30 is sleeved on the sealing rod 20 and located at the radial inner side of the liquid injection pipe portion 11, so that the elastic member 30 can drive the sealing rod 20 to move to open or close the liquid injection hole 12.

For example, as shown in fig. 2 and 3, the pouring spout portion 11 extends in the vertical direction, the pouring spout portion 11 is formed in a hollow cylindrical shape, a cylindrical pouring channel 111 is formed in the hollow portion inside the pouring spout portion 11, the upper end of the pouring spout portion 11 is connected to the top cover 10, and the lower end of the pouring spout portion 11 is opened.

According to some alternative embodiments of the present utility model, referring to fig. 2 and 3, the radial dimension of the end of the pouring spout portion 11 facing the sealing boss 21 (the lower end of the pouring spout portion 11 shown in fig. 3) gradually decreases in the direction from the inlet toward the outlet of the pouring channel 111, and one end of the elastic member 30 (the lower end of the elastic member 30 shown in fig. 3) abuts against the inner wall surface of the one end of the pouring spout portion 11 (the lower end of the pouring spout portion 11 shown in fig. 3). Therefore, the radial dimension of the liquid injection pipe portion 11 is gradually reduced to limit the flow section of the electrolyte, so that the flow rate of the electrolyte in the liquid injection channel 111 can be improved, the liquid injection time is reduced, the efficiency is improved, and furthermore, one end of the liquid injection pipe portion 11 can provide an abutting position for the elastic piece 30, so that the elastic piece 30 is prevented from sliding from the lower end of the liquid injection channel 111 to the inside of the shell.

For example, as shown in fig. 3, at the position from the middle to the lower part of the pouring spout portion 11, the radial dimension of the pouring spout portion 11 gradually decreases from top to bottom, and the radial dimension of the lower end of the pouring spout portion 11 is smaller than the length of the sealing boss 21 extending radially outward, so that the sealing boss 21 can close the pouring hole 12, the upper end of the elastic member 30 abuts against the sealing rod 20, and the lower end of the elastic member 30 abuts against the upper side surface of the lower end of the pouring spout portion 11, so that the elastic member 30 can drive the sealing rod 20 to move up and down.

According to some embodiments of the present utility model, referring to fig. 2 and 3, the sealing rod 20 is formed with a limit boss 22, the limit boss 22 protrudes outward in the radial direction of the sealing rod 20, the limit boss 22 is located in the liquid injection passage 111, and the other end of the elastic member 30 (the upper end of the elastic member 30 as shown in fig. 3) is connected to the limit boss 22. Like this, spacing boss 22 and annotate the lower extreme butt at liquid pipeline and the both ends of elastic component 30, can prevent effectively that elastic component 30 from breaking away from sealing rod 20 to can guarantee that elastic component 30 can drive sealing rod 20 removal in the limited space of spacing boss 22 and annotate liquid pipeline lower extreme, realize annotating opening and closing of liquid hole 12.

According to some alternative embodiments of the present utility model, referring to fig. 1 and 3, an inner wall surface of an end of the pouring spout portion 11 facing away from the sealing boss 21 (an upper end of the pouring spout portion 11 shown in fig. 3) is provided with a stopper 112, an inlet of the pouring channel 111 penetrates the stopper 112 in a thickness direction (an up-down direction shown in fig. 3) of the stopper 112, and the stopper boss 22 is located on a side of the stopper 112 facing the sealing boss 21 (a lower side of the stopper 112 shown in fig. 3). In this way, electrolyte can be filled into the shell from the inlet of the liquid filling channel 111 in the limiting plate 112, so that the liquid filling operation is convenient, and meanwhile, the limiting plate 112 can limit the movement of the sealing boss 21, thereby limiting the movement distance of the sealing rod 20.

For example, as shown in fig. 1 and 3, two limiting plates 112 are symmetrically arranged in the left-right direction, the cross section of each limiting plate 112 is arc-shaped, and each limiting plate 112 is provided with an inlet of the liquid injection channel 111, so that the time for injecting the electrolyte can be reduced, and the liquid injection efficiency can be improved.

According to some embodiments of the present utility model, referring to fig. 1 and 3, in the closed position, the limit boss 22 abuts the limit plate 112, and the limit boss 22 blocks the inlet of the liquid injection passage 111. Thus, when electrolyte is not required to be filled, the limiting boss 22 closes the inlet of the electrolyte injection channel 111, external dirt can be prevented from entering the shell from the electrolyte injection channel 111, the sealing boss 21 closes the electrolyte injection hole 12, and the electrolyte can be prevented from flowing out of the shell, so that the shell is isolated from the outside.

For example, as shown in fig. 3, the limiting boss 22 is annular and is disposed at the lower side of the limiting plate 112, and in the closed position, the elastic member 30 pushes the limiting boss 22 to abut against the lower end of the limiting plate 112, so that the inlet of the liquid injection passage 111 can be closed.

According to a battery cell according to a second aspect of the present utility model, referring to fig. 1 and 3, the battery cell includes a case having a receiving cavity with one side open, and a cap assembly 100 of the first aspect of the present utility model, the cap assembly 100 is sealed at the open side of the receiving cavity, and a pole group is disposed in the receiving cavity.

The top cover assembly 100 and the shell form a closed battery unit, after electrolyte is filled into the accommodating cavity through the top cover assembly 100, the electrolyte fully infiltrates the pole group, and the battery unit can realize conversion between chemical energy and electric energy, so that charging and discharging of the battery unit are realized.

According to the battery cell of the embodiment of the present utility model, by providing the top cap assembly 100 of the embodiment of the first aspect, the sealing rod 20 and the elastic member 30 are provided in the liquid injection channel 111, and the opening and closing of the liquid injection hole 12 can be achieved without adding other components, so that the production cost can be reduced, the production efficiency can be improved, and meanwhile, the electrolyte can be injected into the battery cell for many times, so that the service life of the battery cell can be prolonged.

A battery cell according to an embodiment of the present utility model is described below with reference to fig. 1 to 3.

According to an embodiment of the present utility model, as shown in fig. 1, a battery cell includes: a housing, an electrolyte, a pole group, and a top cap assembly 100. The upper portion of the case is opened, a receiving chamber is formed inside the case, the pole group is disposed in the receiving chamber, and the top cap assembly 100 is disposed on the upper portion of the case. When the cap assembly 100 is capped on the upper side of the case, the electrolyte may be injected into the receiving chamber from the injection hole 12 of the cap assembly 100.

The cap assembly 100 includes: top cap 10, sealing rod 20, elastic member 30, gasket 40, lower plastic 50 and two poles 60. Specifically, the top cover 10 has a liquid injection tube portion 11 extending in the up-down direction, the inner side of the liquid injection tube portion 11 defines a liquid injection channel 111, the radial dimension of the liquid injection tube portion 11 gradually decreases from the middle to the lower portion of the liquid injection tube portion 11, a limiting plate 112 is provided on the inner wall surface of the upper end of the liquid injection tube portion 11, and the inlet of the liquid injection channel 111 penetrates the limiting plate 112 in the up-down direction; the sealing rod 20 penetrates through the liquid injection channel 111, the sealing rod 20 can move up and down in the liquid injection channel 111, a sealing boss 21 protruding outwards in the radial direction of the sealing rod 20 is arranged at the lower end of the sealing rod 20, a containing groove recessed downwards is formed in the upper side surface of the sealing boss 21 facing the liquid injection channel 111, a sealing gasket 40 is sleeved on the sealing rod 20 and is arranged in the containing groove, a limit boss 22 is arranged at the upper end of the sealing rod 20, and the limit boss 22 protrudes outwards in the radial direction of the sealing rod 20; the upper end of the elastic piece 30 is abutted to the lower side surface of the limit boss 22, and the lower end of the elastic piece 30 is abutted to the inner wall surface of the lower end of the liquid injection pipe part 11; the lower plastic 50 is arranged at the lower part of the top cover 10; the two poles 60 are arranged on the top cover 10 at intervals in the left-right direction, the pole 60 on the left side is a positive pole 60, and the pole 60 on the right side is a negative pole 60.

When the battery cell is assembled, the pole group is firstly installed in the accommodating cavity of the shell, then the top cover assembly 100 is covered on the upper open side of the shell, and then the shell is welded and connected with the top cover assembly 100, and at the moment, the battery cell is assembled.

When electrolyte needs to be filled into the battery cell, the ejector pin is utilized to downwards press the upper part of the sealing rod 20, the sealing rod 20 moves downwards, the limiting boss 22 moves downwards and the limiting boss 22 compresses the elastic piece 30, the elastic piece 30 stores elastic force, the sealing boss 21 moves downwards, at the moment, the inlet of the electrolyte filling channel 111 and the electrolyte filling hole 12 are opened, and electrolyte can enter the inside of the shell from the inlet of the electrolyte filling channel 111, the electrolyte filling channel 111 and the electrolyte filling hole 12. After electrolyte is filled, the ejector pin moves upwards, the ejector pin does not apply pressure to the upper end of the sealing rod 20 any more, at this time, the elastic piece 30 releases elastic force, the elastic piece 30 pushes the limiting boss 22 to move upwards, the limiting boss 22 drives the sealing rod 20 to move upwards until the limiting boss 22 abuts against the limiting plate 112 and seals the inlet of the liquid injection channel 111, the sealing boss 21 seals the liquid injection hole 12, the sealing rod 20 does not move any more, and at this time, the inside of the battery cell is isolated from the outside. When it is necessary to fill the electrolyte into the accommodating chamber a plurality of times, the above steps are repeated.

According to the battery cell of the present utility model, by providing the top cover assembly 100 according to the first embodiment, the sealing rod 20 and the elastic member 30 are provided in the liquid injection channel 111, and the opening and closing of the liquid injection hole 12 can be achieved without adding other components, so that the production cost can be reduced, the production efficiency can be improved, and meanwhile, the electrolyte can be injected into the battery cell for many times, so that the service life of the battery cell can be prolonged.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", 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 utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, 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; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. 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 embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A header assembly, comprising:

The top cover is provided with a liquid injection channel penetrating through the top cover along the thickness direction of the top cover;

the sealing rod is provided with a sealing boss protruding outwards along the radial direction of the sealing rod, the sealing rod penetrates through the liquid injection channel and is movable relative to the top cover between an opening position and a closing position, the opening position is used for communicating the spaces on two sides of the top cover in the thickness direction, and the closing position is used for sealing the liquid injection hole by the sealing boss;

The elastic piece is connected between the sealing rod and the top cover, and the elastic piece always pushes the sealing rod to move to the closing position.

2. The cap assembly of claim 1, wherein the sealing boss is located outside of the liquid injection channel, and in the closed position, the sealing boss abuts a peripheral edge of an outlet of the liquid injection channel.

3. The header assembly of claim 2, further comprising: the sealing gasket extends into a ring shape along the circumferential direction of the sealing rod, and is abutted between the sealing boss and the circumferential edge of the outlet of the liquid injection channel.

4. The cap assembly of claim 3, wherein a side surface of the sealing boss facing the liquid injection passage is provided with a recessed receiving groove, and the sealing gasket is disposed in the receiving groove.

5. The cap assembly according to claim 1, wherein the cap has a liquid filling pipe portion extending in a thickness direction of the cap, an inner side of the liquid filling pipe portion defining the liquid filling passage, and the elastic member is fitted over the seal rod and located radially inward of the liquid filling pipe portion.

6. The cap assembly according to claim 5, wherein a radial dimension of an end of the liquid injection tube portion toward the sealing boss is gradually reduced in a direction from an inlet toward an outlet of the liquid injection passage, and an end of the elastic member abuts against an inner wall surface of the end of the liquid injection tube portion.

7. The cap assembly of claim 5, wherein the sealing rod is formed with a limiting boss protruding radially outward of the sealing rod, the limiting boss is located in the liquid injection channel, and the other end of the elastic member is connected to the limiting boss.

8. The cap assembly according to claim 7, wherein an inner wall surface of one end of the liquid injection pipe portion facing away from the sealing boss is provided with a limiting plate, an inlet of the liquid injection passage penetrates through the limiting plate in a thickness direction of the limiting plate, and the limiting boss is located on one side of the limiting plate facing the sealing boss.

9. The cap assembly of claim 8, wherein in the closed position, the limit boss abuts the limit plate and the limit boss blocks the inlet of the liquid injection channel.

10. A battery cell comprising a housing having a receiving cavity open on one side and a cap assembly according to any one of claims 1-9, the cap assembly closing over the open side of the receiving cavity.