CN219457981U - Sealing mechanism and single battery - Google Patents

Abstract

The utility model discloses a sealing mechanism and a single battery, wherein the sealing mechanism is used for sealing a liquid injection channel of the single battery, the sealing mechanism comprises a fixing part and a liquid injection part, and the fixing part is of a sheet structure provided with a through hole so as to fix the sealing mechanism on the single battery; the liquid injection part is of a hollow tubular structure provided with an opening end and a closed end, the opening end is fixed on the through hole so that the liquid injection part is communicated with the inner cavity of the single battery, and the closed end is opened under the action of external force and then is used for injecting electrolyte into the inner cavity of the single battery. Through set up the sealing mechanism of this application on the notes liquid passageway of monomer battery, sealing mechanism passes the passageway that sets up on the manifold and stretches into in the manifold, in the time of constituteing the group battery with annotating liquid portion blind end and take off simultaneously retrieve the incomplete portion in proper order through special frock, solved the link up problem of annotating liquid passageway, and simple structure, effectual, once through rate is high, and this sealing mechanism adopts thin metal or plastics preparation, low cost.

Description

Sealing mechanism and single battery

Technical Field

The utility model relates to the technical field of batteries, in particular to a sealing mechanism and a single battery.

Background

At present, cylindrical batteries, square batteries and soft package batteries are connected in parallel or in series in the market to form a battery pack. When the battery pack is used in an energy storage device, the prismatic battery is a single battery type with higher use rate. In order to make the electrolyte in all the single cells forming the battery pack have higher uniformity, the prior art adopts the following technical scheme: the electrolyte filling channel is arranged on the shell of the single battery, the collecting pipe covering the electrolyte filling channel is arranged, the collecting pipes are spliced to form an electrolyte sharing pipeline when the plurality of single batteries form a battery pack, and under a proper environment, electrolyte is filled into the pipeline to enter the inner cavity of the single battery through the electrolyte filling channel, so that all the single batteries in the battery pack are in a uniform electrolyte environment, and the purpose of improving uniformity is achieved.

However, how the electrolyte in the electrolyte sharing pipeline enters the inner cavity of the electrolyte sharing pipeline through the battery shell, the specific technical scheme is given in Chinese patent CN 115275453A: the electrolyte injection channel is provided with a sealing film which is dissolved when meeting electrolyte or is opened under the traction of external force, and the electrolyte enters the inner cavity of the battery shell through the electrolyte injection channel after an opening is formed. The two ways of penetrating through the liquid injection channel have advantages and disadvantages, for example, the time required for dissolving the sealing film when meeting electrolyte is long, and the problem that all sealing films cannot be simultaneously separated or formed into openings when the sealing film is opened in a way of external force traction may exist, so that the way of penetrating through the liquid injection channel by adopting the sealing mechanism is high-efficiency and convenient and needs to be solved.

Disclosure of Invention

In order to solve the problem that the mode that the existing single battery penetrates through the liquid injection channel is poor in effect, the technical scheme adopted by the utility model is that a sealing mechanism is provided and is used for sealing the liquid injection channel of the single battery, the sealing mechanism comprises a fixing part and a liquid injection part, and the fixing part is of a sheet-shaped structure provided with a through hole so as to fix the sealing mechanism on the single battery; the liquid injection part is of a hollow tubular structure provided with an opening end and a closed end, the opening end is fixed on the through hole so that the liquid injection part is communicated with the inner cavity of the single battery, and the closed end is opened under the action of external force and then is used for injecting electrolyte into the inner cavity of the single battery.

Preferably, a protruding positioning part is arranged at one side of the through hole, which is away from the liquid injection part.

Preferably, the liquid injection part is provided with a weak groove along the circumferential direction thereof.

Preferably, the weak groove is arranged at one end of the liquid injection part far away from the fixing part.

The utility model also provides the following three single batteries:

the first single battery comprises a shell, an electrode assembly and the sealing mechanism, wherein the electrode assembly is arranged in the shell;

the shell is provided with a collecting pipe, the collecting pipe extends along the thickness or width direction of the single battery, meanwhile, a channel is arranged on the side wall of the collecting pipe, the sealing mechanism is arranged at the position of the shell of the single battery corresponding to the channel, the fixing part of the sealing mechanism is arranged on the shell of the single battery in a sealing mode, and the liquid injection part of the sealing mechanism penetrates through the channel and stretches into the collecting pipe.

The second type of single battery comprises a shell, a plurality of soft package batteries and the sealing mechanism, wherein openings are formed in the shells of the soft package batteries, and the soft package batteries are arranged in the shell in parallel;

the shell is provided with a collecting pipe, the collecting pipe extends along the thickness or width direction of the single battery, meanwhile, a channel is arranged on the side wall of the collecting pipe, the sealing mechanism is arranged at the position of the shell of the single battery corresponding to the channel, the fixing part of the sealing mechanism is arranged on the shell of the single battery in a sealing mode, and the liquid injection part of the sealing mechanism penetrates through the channel and stretches into the collecting pipe.

The third single battery comprises a shell, a square battery and the sealing mechanism, wherein the shell of the square battery is provided with an opening, and the square battery is arranged in the shell;

the shell is provided with a collecting pipe which extends along the thickness or width direction of the single battery, meanwhile, the side wall of the collecting pipe is provided with a channel, the position of the shell of the single battery corresponding to the channel is provided with the sealing mechanism, the fixing part of the sealing mechanism is hermetically arranged on the shell of the single battery, or the opening of the square battery is provided with the sealing mechanism, and the fixing part of the sealing mechanism is hermetically arranged on the shell of the square battery;

the liquid injection part of the sealing mechanism passes through the channel and extends into the collecting pipe.

Preferably, the sealing mechanism is welded or adhered to the outer shell of the single battery.

Preferably, the shell of the single battery comprises an upper cover plate, a lower cover plate and a cylinder body, and the collecting pipe is arranged on the lower cover plate.

Preferably, the lower cover plate and the collecting pipe are integrally formed aluminum extrusion parts, the cylinder body is an aluminum extrusion part, and the lower cover plate and the cylinder body are fixed by laser welding.

The beneficial effects of the utility model are as follows: through setting up the sealing mechanism that has tubulose notes liquid portion and slice fixed part on the notes liquid passageway of battery cell, sealing mechanism passes the passageway that sets up on the collecting pipe and stretches into in the collecting pipe, when constituteing the group battery, through special frock with annotate liquid portion blind end unified shovel and retrieve the incomplete portion by this frock simultaneously, both improved the efficiency that link up notes liquid passageway, also can ensure that all sealing mechanisms form the opening simultaneously, and this sealing mechanism simple structure, it is effectual, once through rate is high, this sealing mechanism adopts thin metal or plastics preparation, the technology is mature, low cost, and its use scene pluralism, can be applicable to built-in electrode assembly, a plurality of soft packet batteries of having set up the opening or the battery cell of having set up square battery of opening.

Additional advantages, objects, and features of the utility model will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the utility model.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a seal mechanism in one embodiment;

FIG. 2 is a schematic diagram of a seal mechanism in one embodiment;

FIG. 3a is a schematic view of a seal mechanism from a first perspective in one embodiment;

FIG. 3b is a schematic diagram of a second view of the sealing mechanism in one embodiment;

FIG. 4a is a schematic diagram of a first view of a battery cell and a sealing mechanism according to an embodiment;

FIG. 4b is a schematic diagram of a second view of a battery cell and a sealing mechanism according to an embodiment;

FIG. 4c is a schematic cross-sectional view of a lower cover plate of a single battery according to one embodiment;

FIG. 4d is a schematic view of the structure of the battery case and the connecting member according to one embodiment;

FIG. 5a is a schematic cross-sectional view of a lower cover plate of a single battery according to an embodiment;

FIG. 5b is a schematic diagram of a battery cell and a sealing mechanism according to an embodiment;

fig. 6 is a schematic structural diagram of a unit cell B according to an embodiment;

fig. 7 is a schematic structural diagram of a unit cell C according to an embodiment;

fig. 8 is a schematic structural diagram of a unit cell D according to an embodiment.

Reference numerals:

500-sealing mechanism

510-fixing part

520-liquid injection part

530-locating part

540-Weak groove

541-weak section

100-single battery

1-upper cover plate

2-lower cover plate

21-through hole

211-mounting location

3-barrel

31-first battery assembling base

32-second battery assembling seat

33-radiating groove

34-reinforcing rib

4-manifold

41-connection port

42-channel

5-pole

50-through groove

7-connector

71-connecting nozzle

8-commercial square battery

9-commercially available soft package battery

10-opening

Detailed Description

Although embodiments of the utility model have been disclosed above, they are not limited to the use listed in the specification and embodiments. It can be applied to various fields suitable for the present utility model. Additional modifications will readily occur to those skilled in the art. Therefore, the utility model is not to be limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.

A sealing mechanism and a battery cell according to the present application are specifically disclosed below with reference to the drawings. However, unnecessary detailed description may be omitted. For example, detailed descriptions of well-known matters and repeated descriptions of the actual same structure may be omitted. This is to avoid that the following description becomes unnecessarily lengthy, facilitating the understanding of those skilled in the art. Furthermore, the drawings and the following description are provided for a full understanding of the present application by those skilled in the art, and are not intended to limit the subject matter recited in the claims.

All embodiments and alternative embodiments of the present application may be combined with each other to form new solutions, unless specifically stated otherwise. All technical features and optional technical features of the present application may be combined with each other to form new technical solutions, unless specified otherwise.

Reference herein to "comprising" and "including" means open ended, as well as closed ended, unless otherwise noted. For example, "comprising" and "including" may mean that other components not listed may also be included or included, or that only listed components may be included or included.

It is further understood that the terms "first," "second," and the like, are merely used to distinguish one entity or action from another entity or action and do not necessarily require or imply any actual relationship or order between such entities or actions.

Example 1

As shown in fig. 1, 2, 3a and 3b, the sealing mechanism of the present embodiment is schematically configured at different angles. The sealing mechanism in this embodiment is used for sealing the liquid injection channel of the unit cell. The sealing mechanism includes a fixing portion 510, which is a sheet-like structure provided with a through hole to fix the sealing mechanism to the unit cell 100, and a liquid injection portion 520. In the sealing mechanism of the first embodiment shown in fig. 1 and 2, the through hole is circular, and the fixing portion is also of a circular sheet-like structure, and extends slightly in the circumferential direction of the through hole, so as to be capable of being fixed on the unit cell case 100 corresponding to the liquid injection channel; in the sealing mechanism of the second embodiment shown in fig. 3a and 3b, the through hole is a bar hole, the fixing portion is of a rectangular sheet structure, and the fixing portion has a large area and is suitable for a single battery with a liquid injection channel arranged on the lower cover plate. The liquid injection part 520 of the sealing mechanism in two forms is a hollow tubular structure provided with an open end and a closed end, the open end is fixed on the through hole, so that the liquid injection part is communicated with the inner cavity of the single battery, and the closed end is opened under the action of external force and then is used for injecting electrolyte into the inner cavity of the single battery. The closed end may be opened by cutting the closed end from the side of the liquid injection part with a sharp tool, so that the tubular liquid injection part 520 forms a passage with both ends open.

As shown in fig. 1 and 2, in some embodiments, in order to facilitate positioning and installation, a side of the through hole facing away from the liquid injection portion 520 is provided with a protruding positioning portion 530 along a circumferential direction of the through hole, for example, the positioning portion 530 may be inserted into an opening of a commercially available square battery to accurately install the sealing mechanism 500.

As shown in fig. 1, 2, 3a and 3b, in some embodiments, the liquid injection part 520 is provided with a weak groove 540 along its circumference. The purpose of providing the weakening groove 540 is to: the tool can easily cut the liquid injection part from the weak groove 540, and the success rate and the cutting efficiency of cutting are improved.

Preferably, the weak groove 540 is provided at an end of the liquid injection part 520 remote from the fixing part 510, so that a cutting tool having a slim and small pipe diameter can cut from the bottom end of the liquid injection part.

In some embodiments, a section of the injection part 520 near the closed end may be designed as a weakened section 541, where the weakened section 541 is tapered or has a smaller thickness than other parts of the injection part, to facilitate cutting.

Example 2

The present embodiment provides different types of unit cells including the sealing mechanism 500 provided in embodiment 1 thereon, and when the sealing mechanism 500 is fixed to the unit cell 100, the unit cells are different according to the types of the unit cells:

the present embodiment will be described in detail with respect to the unit cells a to D.

The single cell a as shown in fig. 4 a: comprises a case including an upper cap plate 1, a lower cap plate 2, and a can 3, in which an electrode assembly is placed, and is filled with an electrolyte. As shown in fig. 4a, 4b and 4c, the upper cover plate 1 is provided with a pair of poles 5, the positive and negative poles of the electrode assembly are respectively electrically connected from the inside of the casing to the positive and negative poles outside the casing, the lower cover plate 2 is provided with a through hole 21, a collecting pipe 4 covering the first through hole 21 and extending along the thickness direction of the single battery is further provided, and the side wall of the collecting pipe is provided with a channel 42, and as shown in fig. 4a, the through hole 21 and the channel 42 are respectively circular holes, or may be bar holes as shown in fig. 5 a. In this embodiment, the collecting tube 4 and the lower cover plate 2 are integrally designed as an integrally formed aluminum extrusion, at this time, the through hole 21 and the channel 42 are combined into one channel, the sealing mechanism 500 in fig. 1 is installed in the channel, the sealing mechanism 500 is a plastic piece, the fixing portion 510 is adhered to the edge of the through hole 21 of the lower cover plate 2 extending outwards (when the installation position 211 is set, the fixing portion 510 is adhered to the installation position 211), the liquid injecting portion 520 extends into the channel 42 and extends into the collecting tube, and the through hole of the lower cover plate is sealed. The cylinder body 3 is an aluminum extrusion piece, the lower cover plate 2 is fixed with one end of the cylinder body 3 by laser welding, the electrode assembly is arranged in the cylinder body 3, the upper cover plate 1 welded with the electrode assembly is fixed with the other end of the cylinder body 3 by welding, and the battery is injected through a liquid injection port on the upper cover plate, and the liquid injection port is sealed to form the single battery A.

In this embodiment, the through hole 21 and the channel 42 are circular holes, the fixing portion 510 and the liquid injection portion 520 of the sealing mechanism 500 may be correspondingly arranged into a circular ring shape, an elliptical ring shape or a racetrack ring shape along with the shape change of the through hole 21 and the channel 42, or even a triangle, a rectangle or a polygon, and the fixing portion 510 may be designed to be close to the lower cover plate as shown in fig. 5b, so as to facilitate the sealing and fixing in the later stage.

The sealing mechanism 500 in this embodiment may be made of aluminum, which is the same material as the lower cover plate, and in this case, the sealing mechanism 500 is fixed by welding.

In order to make the sealing mechanism 500 easier to open, a weak groove 540 or a weak section 541 is provided on the sealing mechanism so that the sealing mechanism is easier to open when opened using an external tool.

The unit cell B as shown in fig. 6: made of a commercially available prismatic battery 8 (hereinafter referred to as prismatic battery 8), for example, a 280Ah battery commonly available in the market, the casing of which is usually made of aluminum, has a sealed inner cavity containing an electrolyte and in which at least one set of electrode assemblies is disposed.

Preferably, the square battery 8 is provided with an opening on the housing in the environment with the dew point standard of-25 ℃ to-40 ℃ and the temperature of 23+/-2 ℃ and the cleanliness of 10 ten thousand, the opening 10 is sealed by the sealing mechanism 500 shown in fig. 2, the sealing mechanism 500 is made of aluminum, the positioning part 530 is inserted into the opening 10, the fixing part 510 is welded on the housing at the opening 10 to seal the opening 10, and the inner cavity of the liquid injection part 520 is communicated with the opening 10 for standby.

The single battery B further comprises a housing, the housing is provided with a first through hole 21 on the lower cover plate 2, a collecting pipe 4 covering the first through hole 21 and extending along the thickness direction of the single battery is further provided, the side wall of the collecting pipe is provided with a channel 42, as shown in fig. 4a, the through hole 21 and the channel 42 are respectively round holes, or can be strip holes as shown in fig. 5a, in this embodiment, the collecting pipe 4 and the lower cover plate 2 are integrally designed as an integrally formed aluminum extrusion piece, at the moment, the through hole 21 and the channel 42 are combined into one channel, the barrel 3 is an aluminum extrusion piece, the lower cover plate 2 and one end of the barrel 3 are fixed by laser welding, the positive pole and the negative pole of the square battery 8 are respectively electrically connected with the positive pole and the negative pole of the upper cover plate 1, the square battery 8 of the welded upper cover plate 1 is installed in the barrel 3, the liquid injection part 520 of the sealing mechanism extends into the collecting pipe 4 through the channel 42, and the upper cover plate 1 of the welded square battery 8 is fixed with the other end of the barrel 3 to form the single battery B.

The upper cover plate 1 is not required for the unit cell B, and the unit cell B may be a rectangular cell 8, which is drawn out from the positive and negative electrode posts, and may be sealed in an upper gap after the rectangular cell 8 is mounted on the cylindrical body 3.

The square battery 8 in this embodiment can be sealed by the sealing mechanism 500 shown in fig. 1 and 3a after being opened.

The sealing mechanism 500 in this embodiment may also be made of plastic that is insoluble in the electrolyte, and in this case, the sealing mechanism 500 is adhered to the opening of the prismatic battery.

In order to make the sealing mechanism 500 easier to open, a weak groove 540 or a weak section 541 is provided on the sealing mechanism, and the sealing mechanism is easier to open when opened using an external tool.

The single cell C as shown in fig. 7: made of a commercially available prismatic battery 8 (hereinafter referred to as prismatic battery 8), for example, a 280Ah battery commonly available in the market, the casing of which is usually made of aluminum, has a sealed inner cavity containing an electrolyte and in which at least one set of electrode assemblies is disposed.

The single battery C comprises a housing, a first through hole 21 is formed in the lower cover plate 2 of the housing, a collecting pipe 4 covering the first through hole 21 and extending along the thickness direction of the single battery is further formed, a channel 42 is formed in the side wall of the collecting pipe, as shown in fig. 4a, the through hole 21 and the channel 42 are respectively circular holes, and can also be strip-shaped holes as shown in fig. 5a, in this embodiment, the collecting pipe 4 and the lower cover plate 2 are integrally designed as an integrally formed aluminum extrusion piece, at the moment, the through hole 21 and the channel 42 are combined into one channel, the sealing mechanism 500 shown in fig. 1 is installed in the channel, the sealing mechanism 500 is a plastic piece, the fixing part 510 is adhered to the corresponding edge of the through hole 21 of the lower cover plate 2 (when the installation position 211 is formed), the fixing part 510 is adhered to the installation position 211), the liquid injection part extends into the channel 42 and extends into the collecting pipe, the through hole of the lower cover plate is sealed, and the cylinder 3 is the aluminum extrusion piece; the lower cover plate 2 is fixed with one end of the cylinder body 3 by laser welding, the positive and negative electrode columns of the square battery 8 are respectively and electrically connected with the positive and negative electrode columns of the upper cover plate 1, preferably, the square battery 8 is opened at the bottom of the shell body to form an opening 10 under the environment that the dew point standard is between-25 ℃ and-40 ℃ and the temperature is 23+/-2 ℃ and the cleanliness is 10 ten thousand grades, then the square battery 8 is arranged in the cylinder body 3, and the upper cover plate 1 is fixed with the other end of the cylinder body 3 by welding to form a single battery C.

The upper cover plate 1 is not required for the unit cell C, and the positive and negative electrode posts of the prismatic cell 8 can be led out, and the upper gap after the prismatic cell 8 and the cylinder 3 are mounted can be sealed.

The through hole 21 of the lower cover in this embodiment can also be sealed by the sealing mechanism 500 of fig. 3 a.

The sealing mechanism 500 in this embodiment may be made of aluminum, which is the same material as the lower cover plate, and in this case, the sealing mechanism 500 is fixed by welding.

In order to make the sealing mechanism 500 easier to open, a weak groove 540 or a weak section 541 is provided on the sealing mechanism, and the sealing mechanism is easier to open when opened using an external tool.

The single cell D shown in fig. 8: is manufactured by using a commercially available soft package battery 9 (hereinafter referred to as soft package battery 9), wherein a soft package battery shell is usually an aluminum plastic film and is provided with a sealed inner cavity, electrolyte is contained in the inner cavity, and at least one group of electrode assemblies are arranged in the inner cavity.

The single battery D includes a housing, a first through hole 21 is provided on the lower cover plate 2, a collecting pipe 4 covering the first through hole 21 and extending along the thickness direction of the single battery is further provided, a channel 42 is provided on the side wall of the collecting pipe, as shown in fig. 4a, the through hole 21 and the channel 42 are respectively circular holes, or may be strip holes as shown in fig. 5a, in this embodiment, the collecting pipe 4 and the lower cover plate 2 are integrally designed as an integrally formed aluminum extrusion piece, at this time, the through hole 21 and the channel 42 are combined into one channel, the sealing mechanism 500 shown in fig. 1 is installed in the channel, the sealing mechanism 500 is a plastic piece, the fixing part 510 is adhered to the corresponding edge of the through hole 21 of the lower cover plate 2 (when the installation position 211 is provided, the fixing part 510 is adhered to the installation position 211), the liquid injecting part extends into the channel 42 and extends into the collecting pipe, the through hole of the lower cover plate is sealed, and the cylinder 3 is the aluminum extrusion piece; the lower cover plate 2 is fixed with one end of the cylinder body 3 by laser welding. In this embodiment, seven soft-pack batteries are used, the positive and negative lugs of the seven soft-pack batteries are welded in parallel on the positive and negative poles 5 of the upper cover plate 1, preferably in the environment of the dew point standard of-25 to-40 ℃ and the temperature of 23 ℃ +/-2 ℃ and the cleanliness of 10 ten thousand grades, after the upper opening of the shell of the soft-pack battery, the seven soft-pack batteries welded with the upper cover plate 1 are placed in the cylinder 3, and the upper cover plate 1 is welded and fixed with the other end of the cylinder 3 to form the single battery D.

The upper cover plate 1 may not be used for the unit cell D, so long as the positive and negative tabs of the soft package battery can be led out, and the upper gap between the soft package battery and the cylinder 3 and the upper gap between the soft package battery can be sealed.

The through hole 21 of the lower cover in this embodiment can also be sealed by the sealing mechanism 500 of fig. 3 a.

The sealing mechanism 500 in this embodiment may be made of aluminum, which is the same material as the lower cover plate, and in this case, the sealing mechanism 500 is fixed by welding.

In order to make the sealing mechanism 500 easier to open, a weak groove 540 or a weak section 541 is provided on the sealing mechanism, and the sealing mechanism is easier to open when opened using an external tool.

The function of the manifold in the cells a-D will be described in detail below.

As shown in fig. 4a, fig. 4b, fig. 4c, fig. 4d, when a plurality of single batteries provided with the sealing mechanism 500 form a battery pack, the collecting pipe 4 is spliced to form a through channel to be used as an electrolyte sharing channel of the battery pack, one end of the electrolyte sharing channel is provided with a plugging piece, the other end of the electrolyte sharing channel is provided with a port which can be detachably connected with other components, so that the electrolyte injection component or the explosion venting valve is installed, before the electrolyte injection component is installed, the special tool is used for penetrating into the electrolyte sharing channel to sequentially scoop up the exposed electrolyte injection part of the sealing mechanism 500, so that the inner cavities of all the single batteries are communicated with the electrolyte sharing channel, the special tool is used for recycling the residual part, electrolyte is injected into the electrolyte sharing channel through the electrolyte injection component after the electrolyte injection component is installed, and then enters the battery shell through the channel 42 and the through hole 21, all the single batteries in the battery pack are in a unified electrolyte environment, the uniformity of the electrolyte in the battery pack is effectively improved, and the explosion venting valve is replaced after the electrolyte injection is completed. The electrolyte sharing channel can be used for supplementing and replacing the electrolyte of the battery pack, when the battery pack is used for a certain period of time, and the electrolyte is damaged, the explosion venting valve is replaced, the electrolyte injection component is arranged, the electrolyte is extracted and replaced with new electrolyte or the new electrolyte is directly supplemented, and the two modes are both conducive to prolonging the service life of the battery pack.

The above structure can also realize that when thermal runaway occurs in any single battery, the thermal runaway flue gas in the single battery is discharged to the electrolyte sharing channel formed by the collecting pipe 4 through the through hole 21 and the channel 42 successively, and is discharged after passing through the explosion venting valve.

As shown in fig. 4d, the collecting pipes 4 are fixedly connected through a connecting piece 7 to form an electrolyte sharing channel. The external dimensions of the connecting piece 7 are comparable to those of the manifolds 4, which contributes to the stability of the connection between the manifolds 4. Preferably, the connecting piece 7 comprises two connecting nozzles 71, two ends of the collecting pipe 4 are provided with connecting ports 41, and the connecting nozzles 71 are embedded in the connecting ports 41 for sealing connection; or the connecting piece comprises two connecting ports, connecting nozzles are arranged at two ends of the pipeline, and the connecting nozzles are embedded in the connecting ports for sealing connection. The connecting nozzle is preferably slightly conical in shape, is convenient to insert into the connecting port, is in interference fit with the connecting port, is riveted with the connecting port, and can be further added with adhesives such as epoxy glue and the like on the riveting surface during riveting, so that the sealing and fixing effects are better, or the connecting nozzle is in threaded connection with the connecting port.

As shown in fig. 4a, the pole 5 in this embodiment is provided with a through groove 50 for mounting the heat transfer pipe, and the opening of the through groove 50 is located on the end face of the pole 5. The end face is also provided with an electric connection area so as to be simultaneously connected to the electric connection areas of a plurality of polar posts with the same polarity through an elongated L-shaped platy electric connector, thereby realizing the parallel connection of a plurality of single batteries.

As shown in fig. 4a and 4b, the lower cover plate 2 is further provided with a first battery assembly seat 31 in the width direction thereof; the can side wall is also provided with a second battery assembly seat 32 along its height. When the single batteries are assembled into the battery pack, the single batteries are assembled into the battery pack by installing the assembly strips on the first battery assembly seat 31 and the second battery assembly seat 32, and screw holes for fixing are formed in the assembly seats. The outer surface of the cylinder 3 is provided with a plurality of heat dissipation grooves 33 extending along the height direction thereof, so as to facilitate heat dissipation for the single battery. The cylinder 3 is further provided with a plurality of reinforcing ribs 34 extending in the height direction thereof to improve the compressive strength of the cylinder.

In some embodiments, the manifold may be disposed on a sidewall of the battery can.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the embodiments, and are intended to be included within the scope of the claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims (10)

1. The sealing mechanism is used for sealing a liquid injection channel of a single battery and is characterized by comprising a fixing part and a liquid injection part, wherein the fixing part is of a sheet-shaped structure provided with a through hole so as to fix the sealing mechanism on the single battery; the liquid injection part is of a hollow tubular structure provided with an opening end and a closed end, the opening end is fixed on the through hole so that the liquid injection part is communicated with the inner cavity of the single battery, and the closed end is opened under the action of external force and then is used for injecting electrolyte into the inner cavity of the single battery.

2. The sealing mechanism of claim 1, wherein a protruding positioning portion is provided on a side of the through hole facing away from the liquid injection portion.

3. A sealing mechanism according to claim 1 or 2, wherein the liquid-filled portion is provided with a weakening groove along its circumference.

4. A sealing mechanism according to claim 3, wherein the weakening groove is provided at an end of the liquid injection portion remote from the fixing portion.

5. A single cell comprising a housing, an electrode assembly, and the sealing mechanism of any one of claims 1-4, the electrode assembly disposed within the housing;

the shell is provided with a collecting pipe, the collecting pipe extends along the thickness or width direction of the single battery, meanwhile, a channel is arranged on the side wall of the collecting pipe, the sealing mechanism is arranged at the position of the shell of the single battery corresponding to the channel, the fixing part of the sealing mechanism is arranged on the shell of the single battery in a sealing mode, and the liquid injection part of the sealing mechanism penetrates through the channel and stretches into the collecting pipe.

6. The single battery is characterized by comprising a shell, a plurality of soft-package batteries and the sealing mechanism according to any one of claims 1-4, wherein openings are formed in the shells of the soft-package batteries, and the soft-package batteries are arranged in the shell in parallel;

the shell is provided with a collecting pipe, the collecting pipe extends along the thickness or width direction of the single battery, meanwhile, a channel is arranged on the side wall of the collecting pipe, the sealing mechanism is arranged at the position of the shell of the single battery corresponding to the channel, the fixing part of the sealing mechanism is arranged on the shell of the single battery in a sealing mode, and the liquid injection part of the sealing mechanism penetrates through the channel and stretches into the collecting pipe.

7. A single battery, characterized by comprising a shell, a square battery and the sealing mechanism of any one of claims 1-4, wherein the shell of the square battery is provided with an opening, and the square battery is arranged in the shell;

the shell is provided with a collecting pipe which extends along the thickness or width direction of the single battery, meanwhile, the side wall of the collecting pipe is provided with a channel, the position of the shell of the single battery corresponding to the channel is provided with the sealing mechanism, the fixing part of the sealing mechanism is hermetically arranged on the shell of the single battery, or the opening of the square battery is provided with the sealing mechanism, and the fixing part of the sealing mechanism is hermetically arranged on the shell of the square battery;

the liquid injection part of the sealing mechanism passes through the channel and extends into the collecting pipe.

8. The cell according to claim 5 or 6 or 7, wherein the sealing mechanism is welded or glued to the housing of the cell.

9. The cell of claim 8, wherein the housing of the cell comprises an upper cover plate, a lower cover plate, and a barrel, and wherein the manifold is disposed on the lower cover plate.

10. The cell of claim 9, wherein the lower cover plate and the manifold are integrally formed aluminum extrusion, the cylinder is an aluminum extrusion, and the lower cover plate and the cylinder are laser welded and fixed.