阅读说明：本技术 电池注液结构、动力电池、电池包及电动汽车 (Battery liquid injection structure, power battery, battery pack and electric automobile ) 是由 王有生 李华 远浩 夏春文 于 2020-12-29 设计创作，主要内容包括：本申请公开了一种电池注液结构、动力电池、电池包及电动汽车,至少部分电池注液结构设置在电池顶盖的注液孔内,电池注液结构包括：设置于注液孔远离电芯的一侧的焊接环,焊接环侧壁固定连接于注液孔侧壁,且焊接环上设置至少一个泄压孔；移动件,移动件设置于注液孔靠近电芯的一侧,且移动件抵接于注液孔侧壁,焊接环、移动件和注液孔侧壁围合形成一空腔,泄压孔与空腔连通；密封圈,密封圈设置在移动件侧壁和注液孔侧壁之间；弹性件,弹性件两端分别连接于焊接环和移动件,弹性件可沿预设方向伸长或缩短,以带动移动件沿远离或靠近焊接环的方向移动。本申请通过设置弹性件,实现电池注液结构的重复注液和重复泄压,提高动力电池的使用寿命。(The application discloses battery annotates liquid structure, power battery, battery package and electric automobile, at least partial battery annotates liquid structure and sets up downtheholely in the notes liquid of battery top cap, and the battery annotates the liquid structure and includes: the welding ring is arranged on one side of the liquid injection hole, which is far away from the battery core, the side wall of the welding ring is fixedly connected with the side wall of the liquid injection hole, and at least one pressure relief hole is arranged on the welding ring; the moving piece is arranged on one side, close to the battery core, of the liquid injection hole and abuts against the side wall of the liquid injection hole, the welding ring, the moving piece and the side wall of the liquid injection hole are enclosed to form a cavity, and the pressure relief hole is communicated with the cavity; the sealing ring is arranged between the side wall of the moving piece and the side wall of the liquid injection hole; the elastic component, the elastic component both ends are connected respectively in welding ring and moving member, and the elastic component can be followed and predetermine the direction extension or shorten to drive the moving member and remove along the direction of keeping away from or being close to welding ring. This application realizes the repeated notes liquid and the repeated pressure release of battery notes liquid structure through setting up the elastic component, improves power battery's life.)

1. The utility model provides a battery annotates liquid structure, its characterized in that, at least part battery annotates liquid structure sets up in the notes liquid hole of battery top cap, battery annotates liquid structure includes:

the welding ring is arranged on one side, away from the battery core, of the liquid injection hole, the side wall of the welding ring is fixedly connected to the side wall of the liquid injection hole, and at least one pressure relief hole is formed in the welding ring;

the moving piece is arranged on one side, close to the battery core, of the liquid injection hole and abuts against the side wall of the liquid injection hole, the welding ring, the moving piece and the side wall of the liquid injection hole are enclosed to form a cavity, and the at least one pressure relief hole is communicated with the cavity;

the sealing ring is arranged between the side wall of the moving part and the side wall of the liquid injection hole;

the elastic piece, the elastic piece both ends connect respectively in the welding ring with the moving member, the elastic piece can be followed and predetermine the direction extension or shorten to drive the moving member is along keeping away from or being close to the direction of welding ring removes.

2. The battery electrolyte injection structure according to claim 1, wherein both ends of the elastic member are fixedly connected or detachably connected with the welding ring and the moving member, respectively.

3. The battery electrolyte injection structure according to claim 2, wherein the weld ring includes a first threaded hole provided in the weld ring, the moving member includes a second threaded hole provided in the fixing ring, and the elastic member includes an elastic member body and first and second threaded portions that are respectively threadedly connected to the first and second threaded holes.

4. The battery electrolyte injection structure according to claim 3, wherein the weld ring further comprises a first weld ring body and a second weld ring body fixedly connected to the first weld ring body, the second weld ring body is disposed on a side of the first weld ring body close to the moving member, and the first threaded hole is formed in the second weld ring body.

5. The battery electrolyte injection structure according to claim 4, wherein the moving member further comprises a first moving member body and a second moving member body fixedly connected to the first moving member body, the second moving member body is disposed on one side of the first moving member body close to the welding ring, and the second threaded hole is formed in the second moving member body.

6. The battery electrolyte injection structure according to claim 5, wherein the moving member further includes a through hole formed in the first moving member body, the weld ring further includes a third weld ring body fixedly connected to the second weld ring body, the elastic member is wound around the third weld ring body, and the third weld ring body penetrates through the through hole.

7. The battery liquid injection structure according to claim 6, wherein a sliding seal is provided between the third weld ring body and the through hole.

8. The battery electrolyte injection structure according to claim 1, wherein the elastic member is a spring.

9. The battery electrolyte injection structure according to claim 1, wherein the welding ring includes a guide groove, the moving member includes a sliding portion, the sliding portion is disposed in the guide groove, two ends of the elastic member are respectively connected to the sliding portion and the guide groove, and the sliding portion can slide along the guide groove to drive the moving member to move in a direction away from or close to the welding ring.

10. The battery electrolyte injection structure according to claim 1, wherein the welding ring includes a blind hole, the moving member includes an extending shaft, the extending shaft extends into the blind hole, two ends of the elastic member are respectively connected to the extending shaft and an inner wall of the blind hole, and the extending shaft can slide along the inner wall of the blind hole to drive the moving member to move in a direction away from or close to the welding ring.

11. The battery electrolyte injection structure according to claim 1, wherein the electrolyte injection hole comprises a first sub-electrolyte injection hole and a second sub-electrolyte injection hole communicated with the first sub-electrolyte injection hole, the welding ring is fixedly connected to a side wall of the first sub-electrolyte injection hole, and the moving member abuts against a side wall of the second sub-electrolyte injection hole; the battery top cover comprises a first surface and a second surface which are arranged oppositely, the diameter of the first sub-liquid injection hole is gradually reduced along the direction from the first surface to the second surface, the diameter of the second sub-liquid injection hole is the same, and the minimum diameter of the first sub-liquid injection hole is the same as that of the second sub-liquid injection hole.

12. The battery electrolyte injection structure according to claim 11, wherein the weld ring includes a top surface remote from the moving member, the top surface being at the same height as the first surface.

13. The battery electrolyte injection structure according to claim 11, wherein the top cap comprises a first top cap and a second top cap fixedly connected to a side of the first top cap away from the moving member, the electrolyte injection hole extends through the first top cap and the second top cap, the second top cap comprises a third surface away from the side of the first top cap, the welding ring comprises a top surface away from the moving member, and the top surface and the third surface are located at the same height.

14. The battery electrolyte injection structure according to claim 13, wherein a spacing between the first surface and the third surface is less than or equal to 10 mm.

15. The battery electrolyte injection structure according to claim 1, wherein the moving member further comprises a groove for accommodating the sealing ring, one end of the sealing ring abuts against the groove, and the other end of the sealing ring abuts against the sidewall of the electrolyte injection hole.

16. A power battery comprising the battery electrolyte injection structure according to any one of claims 1 to 15.

17. A battery pack comprising the battery liquid injection structure according to any one of claims 1 to 15.

18. An electric vehicle characterized by comprising the battery liquid injection structure according to any one of claims 1 to 15.

Technical Field

The application relates to the technical field of battery top covers, in particular to a battery liquid injection structure, a power battery, a battery pack and an electric automobile.

Background

The liquid injection hole of the existing power battery arranged on the battery top cover is generally sealed by plugging the liquid injection port with rubber, and then welded to the liquid injection hole of the top cover by an aluminum nail. Although the liquid injection hole can be completely sealed by the sealing mode, the liquid injection can be performed only once, if electrolyte is added subsequently, the electrolyte cannot be injected, and the whole battery can only be discarded, so that loss is caused.

Meanwhile, explosion prevention is realized by arranging the explosion-proof piece on the existing battery top cover, when the internal pressure of the battery is too high, the explosion-proof piece is utilized to explode to release the pressure, so that the explosion of the battery is avoided, but the explosion-proof piece needs to be replaced again once the explosion is carried out at overpressure.

Therefore, the technical problem that the service life of a battery top cover is short due to the fact that a liquid injection hole and an explosion-proof sheet cannot be reused in the prior art of a battery liquid injection structure, a power battery, a battery pack and an electric automobile is urgently needed to be provided.

Disclosure of Invention

The application provides a battery annotates liquid structure, power battery, battery package and electric automobile aims at solving the unable used repeatedly of notes liquid hole, explosion-proof piece that exist among the prior art, leads to the lower technical problem of battery top cap life-span.

In a first aspect, the present application provides a battery liquid injection structure, at least part the battery liquid injection structure is arranged in a liquid injection hole of a battery top cover, the battery liquid injection structure comprises:

the welding ring is arranged on one side, away from the battery core, of the liquid injection hole, the side wall of the welding ring is fixedly connected to the side wall of the liquid injection hole, and at least one pressure relief hole is formed in the welding ring;

the moving piece is arranged on one side, close to the battery core, of the liquid injection hole and abuts against the side wall of the liquid injection hole, a cavity is formed by enclosing the welding ring, the moving piece and the side wall of the liquid injection hole, and the at least one pressure relief hole is communicated with the cavity;

the sealing ring is arranged between the side wall of the moving part and the side wall of the liquid injection hole;

the elastic piece, the elastic piece both ends connect respectively in the welding ring with the moving member, the elastic piece can be followed and predetermine the direction extension or shorten to drive the moving member is along keeping away from or being close to the direction of welding ring removes.

In a possible implementation manner of the present application, two ends of the elastic member are respectively fixedly connected or detachably connected to the welding ring and the moving member.

In this application, the weld ring is including offering first screw hole on the weld ring, the moving member is including offering second screw hole on the solid fixed ring, the elastic component include the elastic component body and respectively with first screw hole threaded connection's first screw thread portion and second screw thread portion.

In this application a possible implementation, the weld ring still include first weld ring body and with first weld ring body fixed connection's second weld ring body, the setting of second weld ring body is in first weld ring body is close to one side of moving member, first screw hole is seted up on the second weld ring body.

In this application, in a possible implementation manner, the moving member further includes a first moving member body and a second moving member body fixedly connected with the first moving member body, the second moving member body is arranged on one side of the first moving member body close to the welding ring, and the second threaded hole is formed in the second moving member body.

In this application a possible implementation, the moving member still including offer through-hole on the first moving member body, the solder ring still include with second solder ring body fixed connection's third solder ring body, the elastic component is around establishing the third solder ring is originally external, the third solder ring body runs through the through-hole.

In one possible implementation of the present application, a sliding seal is disposed between the third weld ring body and the through hole.

In one possible implementation of the present application, the elastic member is a spring.

In this application, in a possible implementation, the welding ring includes the guide way, the moving member includes the sliding part, the sliding part set up in the guide way, the elastic component both ends connect respectively in the sliding part with the guide way, the sliding part can be followed the guide way slides, in order to drive the moving member is along keeping away from or being close to the direction removal of welding ring.

In this application, in a possible implementation, the welding ring includes a blind hole, the moving member includes an extension shaft, the extension shaft stretches into to in the blind hole, the elastic component both ends connect respectively in the extension shaft with the blind hole inner wall, the extension shaft can be followed the blind hole inner wall slides, in order to drive the moving member is along keeping away from or being close to the direction of welding ring removes.

In one possible implementation manner of the present application, the liquid injection hole includes a first sub-liquid injection hole and a second sub-liquid injection hole communicated with the first sub-liquid injection hole, the welding ring is fixedly connected to a sidewall of the first sub-liquid injection hole, and the moving member abuts against a sidewall of the second sub-liquid injection hole; the battery top cover comprises a first surface and a second surface which are arranged oppositely, the diameter of the first sub-liquid injection hole is gradually reduced along the direction from the first surface to the second surface, the diameter of the second sub-liquid injection hole is the same, and the minimum diameter of the first sub-liquid injection hole is the same as that of the second sub-liquid injection hole.

In one possible implementation of the present application, the solder ring includes a top surface, and the top surface is located at the same height as the first surface.

In this application, in a possible implementation, the top cap includes first top cap and fixed connection and keeps away from the second top cap of moving member one side in first top cap, annotate the liquid hole and run through first top cap with the second top cap, the second top cap is including keeping away from the third surface of first top cap one side, the welding ring is including keeping away from a top surface of moving member, the top surface with the third surface is located same height.

In one possible implementation of the present application, a distance between the first surface and the third surface is less than or equal to 10 mm.

In this application a possible implementation, the moving member outer wall sets up the recess that is used for holding the sealing washer, sealing washer one end butt in the recess, sealing washer other end butt in annotate liquid hole lateral wall.

In a second aspect, the present application further provides a power battery, including a battery liquid injection structure, the battery liquid injection structure is a battery liquid injection structure in any of the above implementation manners.

In a third aspect, the present application further provides a battery pack, including a battery liquid injection structure, where the battery liquid injection structure is a battery liquid injection structure in any of the above implementation manners.

In a third aspect, the present application further provides an electric vehicle, including a battery liquid injection structure, where the battery liquid injection structure is a battery liquid injection structure in any one of the above implementation manners.

Compared with the prior art, this application is through setting up the elastic component, when needs annotate the liquid to the battery, liquid pours into through the pressure release hole that sets up on the weld ring into, along with the increase of pouring into liquid, the pressure that the moving member bore is bigger and bigger, the moving member drives the elastic component and removes to the direction that is close to electric core, until cavity and the inside intercommunication of battery, inside liquid passes through pressure release hole and cavity injection battery, realize annotating the liquid, after annotating the liquid, the moving member resets under the drive of elastic component, realize the repeated notes liquid. When the inside great atmospheric pressure that produces of battery, the moving member drives the elastic component and removes to the direction that is close to the welding ring, and until cavity and the inside intercommunication of battery, it is outside that gaseous flows to the battery through cavity and pressure release hole, realizes the pressure release, and after the pressure release, the moving member resets under the drive of elastic component, realizes repeated pressure release, consequently, the battery of this application annotates the liquid structure and can realize repeated pressure release and repeated notes liquid, improves the life of battery top cap.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a battery electrolyte injection structure provided in an embodiment of the present application;

FIG. 2 is a schematic structural diagram of a solder ring provided in an embodiment of the present application;

FIG. 3 is a schematic structural diagram of a moving part provided in an embodiment of the present application;

FIG. 4 is a bottom view of a solder ring provided by an embodiment of the present application;

FIG. 5 is a top view of a moving member provided in an embodiment of the present application;

FIG. 6 is a schematic structural diagram of a movable connection mode of a welding ring and a moving part according to an embodiment of the present disclosure;

FIG. 7 is a schematic structural diagram of another moveable connection manner of the weld ring and the moving member according to an embodiment of the present disclosure;

FIG. 8 is a schematic structural diagram of a pour hole provided in the embodiments of the present application;

FIG. 9 is another schematic structural diagram of a battery electrolyte injection structure provided in an embodiment of the present application

FIG. 10 is a schematic structural diagram of a battery liquid injection structure provided by an embodiment of the present application during liquid injection;

fig. 11 is a schematic structural diagram of a battery electrolyte injection structure according to an embodiment of the present application when pressure is released.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be considered as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In this application, the word "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the application. In the following description, details are set forth for the purpose of explanation. It will be apparent to one of ordinary skill in the art that the present application may be practiced without these specific details. In other instances, well-known structures and processes are not set forth in detail in order to avoid obscuring the description of the present application with unnecessary detail. Thus, the present application is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.

The embodiment of the application provides a battery liquid injection structure, a power battery, a battery pack and an electric automobile, which are explained in detail below.

As shown in fig. 1, for the battery electrolyte filling structure provided by the embodiment of the present application, at least a part of the battery electrolyte filling structure 10 is disposed in the electrolyte filling hole 21 of the battery top cover 20, and the battery electrolyte filling structure 10 includes:

the welding ring 100 is arranged on one side of the liquid injection hole, which is far away from the battery core, the side wall of the welding ring 100 is fixedly connected with the side wall of the liquid injection hole 21, and at least one pressure relief hole 101 is arranged on the welding ring 100;

the moving piece 200 is arranged on one side, close to the battery core, of the liquid injection hole, the moving piece 200 abuts against the side wall of the liquid injection hole 21, a cavity 201 is formed by enclosing the welding ring 100, the moving piece 200 and the side wall of the liquid injection hole 21, and the at least one pressure relief hole 101 is communicated with the cavity 201;

the sealing ring 300 is arranged between the side wall of the moving piece 200 and the side wall of the liquid injection hole 21;

the elastic member 400, two ends of the elastic member 400 are respectively connected to the welding ring 100 and the moving member 200, and the elastic member 400 can extend or shorten along a predetermined direction to drive the moving member 200 to move along a direction away from or close to the welding ring 100.

This application embodiment is through setting up elastic component 400, when needs annotate the liquid to the battery, liquid pours into through pressure release hole 101 that sets up on weld ring 100, along with the increase of pouring into liquid, the pressure that moving member 200 bore is bigger and bigger, moving member 200 drives elastic component 400 and removes to the direction that is close to electric core, elastic component 400 extends along predetermineeing the direction, until cavity 201 and the inside intercommunication of battery, inside liquid flows into the battery through pressure release hole 101 and cavity 201, realize annotating the liquid, after annotating the liquid, moving member 200 resets under elastic component 400's drive, realize the repeated notes liquid. When the inside great atmospheric pressure that produces of battery, moving member 200 drives elastic component 400 and removes to the direction that is close to weld ring 100, elastic component 400 shortens along predetermineeing the direction, until cavity 201 and the inside intercommunication of battery, it is gaseous outside through cavity 201 and the outflow of pressure release hole 101, realize the pressure release, after the pressure release, moving member 200 resets under elastic component 400's drive, realize repeated pressure release, the battery of this application embodiment annotates liquid structure 10 can realize repeated pressure release and repeated notes liquid, improve battery top cap 20's life.

It should be understood that: the number of the pressure relief holes 101 may be one or more, and is not limited herein, and may be adjusted according to actual requirements.

Further, in some embodiments of the present application, the two ends of the elastic member 400 are fixedly connected or detachably connected to the weld ring 100 and the moving member 200.

Wherein, the two ends of the elastic member 400 can be connected with the welding ring 100 and the moving member 200 by welding. Through the arrangement, the connection between the two ends of the elastic element 400 and the welding ring 100 and the moving element 200 is stable and reliable.

Preferably, both ends of the elastic member 400 are detachably coupled to the weld ring 100 and the moving member 200. Through the arrangement, the elastic part 400 can be replaced in time when damaged, the welding ring 100 and the moving part 200 do not need to be replaced at the same time, and the service life of the battery liquid injection structure 10 is further prolonged.

Specifically, as shown in fig. 1, 4 and 5, the welding ring 100 includes a first threaded hole 110 opened on the welding ring 100, the moving member 200 includes a second threaded hole 210 opened on the fixing ring 200, and the elastic member 400 includes an elastic member body 410 and a first threaded portion (not shown) and a second threaded portion (not shown) respectively threadedly coupled with the first threaded hole 110 and the second threaded hole 210.

It should be understood that: the center lines of the first and second threaded holes 110 and 210 coincide.

It should be noted that: the above-mentioned threaded connection is only one of the detachable connection modes of the two ends of the elastic member 400, the weld ring 100 and the moving member 200, and in some embodiments of the present application, the two ends of the elastic member 400, the weld ring 100 and the moving member 200 can be detachably connected through a snap connection mode.

Further, as shown in fig. 2, the weld ring 100 further includes a first weld ring body 120 and a second weld ring body 130 fixedly connected to the first weld ring body 120, the second weld ring body 130 is disposed on one side of the first weld ring body 120 close to the moving member 200, and the first threaded hole 110 is opened on the second weld ring body 130.

Through the arrangement, the strength of the welding ring 100 can be ensured while the elastic piece 400 is in threaded connection with the welding ring 100, the problem that the welding ring 100 with the first threaded hole 110 is easily damaged when the first welding ring body 120 is only arranged is avoided, and the reliability of the welding ring 100 is improved.

Further, as shown in fig. 3, the moving member 200 further includes a first moving member body 220 and a second moving member body 230 fixedly connected to the first moving member body 220, the second moving member body 230 is disposed on one side of the first moving member body 210 close to the welding ring 100, and the second threaded hole 210 is opened on the second moving member body 230.

Through the arrangement, the strength of the moving part 200 can be ensured while the threaded connection between the elastic part 400 and the moving part 200 is realized, and the situation that when only the first moving part body 220 is arranged, the moving part 200 at the position of the second threaded hole 210 is easily damaged by arranging the second threaded hole 210 at the upper part is avoided, so that the reliability of the moving part 200 is improved.

It should be noted that, in order to simplify the manufacturing process and reduce the cost, in some embodiments of the present application, the second weld ring body 130 and the second moving member body 230 are hexagonal nuts. Through the arrangement, threaded holes do not need to be formed in the second welding ring body 130 and the second moving part body 230, standard parts can be directly used, and cost is reduced.

Further, as shown in fig. 3, a groove 240 for accommodating a seal 300 is provided on the outer wall of the moving member 200, one end of the seal 300 abuts against the groove 240, and the other end of the seal 300 abuts against the sidewall of the liquid injection hole 21.

Further, as shown in fig. 1 and 5, the moving member 200 further includes a through hole 221 formed on the first moving member body 220, the weld ring 100 further includes a third weld ring body 140 fixedly connected to the second weld ring body 130, the elastic member 400 is wound around the third weld ring body 140, and the third weld ring body 140 penetrates through the through hole 221.

Through the above arrangement, the third weld ring body 140 can provide guidance for the movement of the moving member 200, so as to prevent the moving member 200 from moving in a direction deviating from a preset direction, and thus the moving member 200 cannot be reset or is not in the original position when being reset.

It should be understood that: in order to prevent the elongation or contraction of the elastic member 400 from being affected, the width of the third weld ring body 140 is smaller than the width of the elastic member 400.

To avoid cell leakage when the third weld ring body moves along the through-hole 221, in some embodiments of the present application, a sliding seal is provided between the third weld ring body 140 and the through-hole 221. Through setting up sliding seal spare, can realize on the one hand that third weld ring body 140 removes along through-hole 221, realize the guide effect, on the other hand, still can avoid the technical problem of the battery gas leakage that leads to because third weld ring body 140 removes along through-hole 221.

Further, in some embodiments of the present application, the elastic member 400 is a spring. This is because, when the elastic member 400 is a spring, the spring with different elastic coefficients can be selected according to different requirements, so that the applicability is strong, and meanwhile, the cost of the spring is low.

It should be understood that the movable connection manner of the welding ring 100 and the moving member 200 is not limited to the above manner, in some embodiments of the present application, as shown in fig. 6, the welding ring 100 includes a guide groove 1001, the moving member 200 includes a sliding portion 2001, the sliding portion 2001 is disposed in the guide groove 1001, two ends of the elastic member 400 are respectively connected to the guide groove 1001 and the sliding portion 2001, and the sliding portion 2001 can slide along the guide groove 1001 to drive the moving member 200 to move in a direction away from or close to the welding ring 100.

The working principle of the battery liquid injection structure 10 in the above embodiment is as follows: when need annotate the liquid to the battery, liquid pours into through pressure release hole 101 that sets up on weld ring 100, and along with the increase of pouring into liquid, the pressure that moving member 200 bore is bigger and bigger, and sliding part 2001 drives and moves along the direction of keeping away from weld ring 100, appears the space between moving member 200 and the notes liquid hole 21, promptly: cavity 201 and the inside intercommunication of battery, inside liquid flowed into the battery through pressure release hole 101 and cavity 201, realized annotating the liquid, after annotating the liquid, moving member 200 resets under the drive of elastic component 400, realizes the repeated notes liquid. When a large air pressure is generated inside the battery, the sliding portion 2001 moves in a direction close to the weld ring 100, and a gap occurs between the moving member 200 and the pour hole 21, that is: cavity 201 and the inside intercommunication of battery, it is gaseous outside through cavity 201 and the outflow of pressure release hole 101, realize the pressure release, after the pressure release, moving member 200 resets under the drive of elastic component 400, realizes repeated pressure release, and the battery of this application embodiment annotates liquid structure 10 can realize repeated pressure release and repeated notes liquid, improves battery top cap 20's life.

In some embodiments of the present application, as shown in fig. 7, the solder ring 100 includes a blind hole 1002, the moving member 200 includes an extending shaft 2002, the extending shaft 2002 extends into the blind hole 1002, two ends of the elastic member 400 are respectively connected to the extending shaft 2002 and an inner wall of the blind hole 1002, and the extending shaft 2002 can slide along the inner wall of the blind hole 1002 to drive the moving member 200 to move in a direction away from or close to the solder ring 100. The working principle of this embodiment is the same as that of the above embodiment, and is not described herein again.

Further, as shown in FIG. 8, the pour hole 21 includes a first sub-pour hole 211 and a second sub-pour hole 212 communicating with the first sub-pour hole 211, the weld ring 100 is fixedly connected to the sidewall of the first sub-pour hole 211, and the moving member 200 abuts against the sidewall of the second sub-pour hole 212; the battery top lid 20 includes a first surface 22 and a second surface 23 that are oppositely disposed, and the diameter of the first sub-pour hole 211 is gradually reduced in the direction from the first surface 22 to the second surface 23, the diameter of the second sub-pour hole 212 is the same, and the minimum diameter of the first sub-pour hole 211 is the same as the diameter of the second sub-pour hole 212.

Through the arrangement, when liquid is injected, the liquid flow passage can be prevented from being injected out of the liquid injection hole 21, and meanwhile, the installation of the moving piece 200 and the sealing ring 300 can be facilitated.

Meanwhile, the diameter of the second sub-injection hole 212 which is abutted against the moving piece 200 is unchanged, the sealing capacity of the sealing ring 300 for the injection hole structure 10 can be improved, the problems of air leakage and liquid leakage when the battery injection structure 10 does not work are avoided, and the safety and the reliability of the battery injection structure 10 are further improved.

Further, in order to avoid interference or breakage of the sealing ring 300 caused by the second sub-pour hole 212 when the moving member 200 is repositioned from the side away from the weld ring 100, in some embodiments of the present application, the side of the second sub-pour hole 212 away from the weld ring 100 is rounded.

Similarly, in order to avoid interference or damage to the gasket 300 at the junction of the second sub-pour hole 212 and the first sub-pour hole 211 when the moving member is repositioned from the side near the weld ring 100, in some embodiments of the present application, the junction of the first sub-pour hole 211 and the second sub-pour hole 212 is rounded.

Further, as shown in fig. 1 and 8, one end of the packing 300 abuts against the groove 240 of the moving member 200, and the other end of the packing 300 abuts against the sidewall of the second sub-injection hole 212.

As shown in fig. 1, the weld ring 100 is disposed on a side close to the first surface 22, and the moving member 200 is disposed on a side close to the second surface 23.

As shown in fig. 1, in some embodiments of the present application, the weld ring 100 includes a top surface 102 away from the moving member 200, and the top surface 102 is at the same height as the first surface 22, so as to improve the aesthetic appearance of the battery top cover 20.

As shown in FIG. 9, in some embodiments of the present application, the top cap 20 comprises a first top cap 24 and a second top cap 25 fixedly connected to a side of the first top cap 24 away from the moving member 200, the liquid injection hole 21 extends through the first top cap 24 and the second top cap 25, the second top cap 25 comprises a third surface 26 away from the side of the first top cap 24, and the top surface 102 and the third surface 26 are located at the same height. By the arrangement, the area of the cavity 201 formed by the injection hole 21, the welding ring 100 and the moving member 200 can be increased. By increasing the area of the cavity 201, the length of the elastic member 400 can be increased, thereby improving the efficiency of liquid injection or pressure release.

Through the arrangement, when the liquid injection structure 10 of the battery is not injected with liquid or is decompressed, the sealing performance of the liquid injection hole 21 is ensured, liquid leakage is avoided, and the reliability of the liquid injection structure 10 of the battery is improved.

Further, in some embodiments of the present application, as shown in fig. 9, the spacing between the first surface 22 and the third surface 26 is less than or equal to 10 mm.

With the above arrangement, the assemblability of the battery top cover 20 can be ensured. Specifically, with the above arrangement, when the power battery is assembled or the power battery is assembled into a battery module, the interference between the second top cover 25 and the other components of the power battery or the battery module due to the excessively large distance between the first surface 22 and the third surface 26, and thus poor assembly performance, can be avoided.

As shown in fig. 10, when needing to inject liquid into the battery, liquid is injected through the pressure relief hole 101 arranged on the welding ring 100, along with the increase of the injected liquid, the pressure born by the moving member 200 is larger and larger, the moving member 200 drives the elastic member 400 to move towards the direction close to the inside of the battery, the elastic member 400 extends along the preset direction, and a gap appears between the moving member 200 and the liquid injection hole 21, namely: cavity 201 and the inside intercommunication of battery, inside liquid flowed into the battery through pressure release hole 101 and cavity 201, realized annotating the liquid, after annotating the liquid, moving member 200 resets under the drive of elastic component 400, realizes the repeated notes liquid.

As shown in fig. 11, when a large air pressure is generated inside the battery, the moving member 200 drives the elastic member 400 to move toward the direction close to the weld ring 100, the elastic member 400 shortens along the preset direction, and a gap appears between the moving member 200 and the liquid injection hole 21, that is: cavity 201 and the inside intercommunication of battery, it is gaseous outside through cavity 201 and the outflow of pressure release hole 101, realize the pressure release, after the pressure release, moving member 200 resets under the drive of elastic component 400, realizes repeated pressure release, and the battery of this application embodiment annotates liquid structure 10 can realize repeated pressure release and repeated notes liquid, improves battery top cap 20's life.

In a second aspect, an embodiment of the present application further provides a power battery, where the power battery includes a battery liquid injection structure 10, and the battery liquid injection structure 10 is the battery liquid injection structure 10 in any of the above embodiments.

In a third aspect, an embodiment of the present application further provides a battery pack, where the battery pack includes a battery electrolyte injection structure 10, and the battery electrolyte injection structure 10 is the battery electrolyte injection structure 10 in any of the embodiments.

In a fourth aspect, an embodiment of the present application further provides an electric vehicle, where the electric vehicle includes a battery electrolyte injection structure 10, and the battery electrolyte injection structure 10 is the battery electrolyte injection structure 10 in any of the embodiments.

To sum up, this application embodiment is through setting up elastic component 400, when needs annotate liquid to the battery, liquid pours into through pressure release hole 101 that sets up on weld ring 100, along with the increase of pouring into liquid, the pressure that moving member 200 bore is bigger and bigger, moving member 200 drives elastic component 400 and removes to the direction that is close to electric core, elastic component 400 is along predetermineeing the direction extension, until cavity 201 and the inside intercommunication of battery, inside liquid passes through pressure release hole 101 and cavity 201 and flows into the battery, realize annotating liquid, after annotating liquid, moving member 200 resets under elastic component 400's drive, realize repeated notes liquid. When a large air pressure is generated inside the battery, the moving member 200 drives the elastic member 400 to move towards the direction close to the welding ring 100, the elastic member 400 is shortened along the preset direction until the cavity 201 is communicated with the inside of the battery, and the gas flows out of the battery through the cavity 201 and the pressure relief hole 101 to realize pressure relief, after the pressure relief is finished, the moving member 200 is reset under the driving of the elastic member 400 to realize repeated pressure relief, so that the repeated pressure relief and repeated liquid injection can be realized, and the service life of the battery top cover 20 is prolonged; in addition, the third welding ring body 140 penetrating through the through hole 221 of the moving member 200 provides guidance for the movement of the moving member 200, thereby achieving the technical effect of improving the reliability of the battery liquid injection structure 10.

In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and parts that are not described in detail in a certain embodiment may refer to the above detailed descriptions of other embodiments, and are not described herein again. In specific implementation, the above units or structures may be implemented as independent entities, or may be combined arbitrarily and implemented as one or several entities, which is not described herein again.

The battery liquid injection structure, the power battery, the battery pack and the electric vehicle provided by the embodiment of the application are introduced in detail, a specific example is applied in the description to explain the principle and the implementation mode of the application, and the description of the embodiment is only used for helping to understand the structure and the core idea of the application; meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.