CN115360484A

CN115360484A - Electrolyte sharing unit and large-capacity battery

Info

Publication number: CN115360484A
Application number: CN202211038738.8A
Authority: CN
Inventors: 郑高锋; 雷政军; 翟腾飞
Original assignee: Shaanxi Olympus Power Energy Co Ltd
Current assignee: Shaanxi Olympus Power Energy Co Ltd
Priority date: 2022-08-29
Filing date: 2022-08-29
Publication date: 2022-11-18

Abstract

The invention provides an electrolyte sharing unit and a high-capacity battery, wherein the sharing unit comprises a plurality of subunits, each subunit comprises a main circuit and a branch circuit, the main circuit is used for splicing the subunits to form the sharing unit, the branch circuits are fixedly installed with a battery cell shell and used for injecting electrolyte into the battery cell shell, each main circuit comprises a first connecting end and a second connecting end, and two adjacent subunits are fixedly spliced to form the electrolyte sharing unit through the first connecting end and the second connecting end respectively. The invention can effectively and conveniently finish pipeline assembly by splicing pipelines sharing electrolyte, is convenient for installing pipelines and batteries, can be applied to square shell batteries, can be opened on the pole of the square shell battery, ensures that the sharing unit can be used as a uniform pole of all square shell batteries after completing a liquid injection task, has simple structure, is convenient for assembly, reduces assembly procedures and has good effect.

Description

Electrolyte sharing unit and large-capacity battery

Technical Field

The application relates to the technical field of batteries, in particular to an electrolyte sharing unit and a high-capacity battery.

Background

The square battery of lithium cell maximum capacity on the existing market is 300Ah, nevertheless receives the influence of battery capacity, and the lithium cell need carry out the series-parallel connection of a plurality of batteries when the energy storage is used for the hookup accessories is various, and the hookup step is complicated, loaded down with trivial details, and the quantity of battery management system and wire rod, battery box is very big, and the energy storage cost is consequently high.

How to combine small-capacity batteries into large-capacity batteries, and to make them have stable battery performance and high yield is a problem to be solved.

Patent CN111969177A discloses a post assembly integrating an injection hole, a battery top cover and an injection method, wherein the post and a conductive column fixedly arranged at the top end of the post are arranged, the post and the conductive column are correspondingly provided with a through injection hole, and the post is also provided with an elastic rubber sealing plug for blocking the injection hole; by adopting the mode of integrating the pole and the liquid injection hole and arranging the elastic rubber sealing plug on the pole, the liquid injection needle tube pierces the sealing plug and extends into the battery shell during liquid injection. The method needs to use a needle tube to inject liquid, and the injection method is complex and is not easy to operate.

Patent CN215933770U discloses a battery row and group battery, and the battery row includes that a plurality of cylindrical battery of monomer arrange in a row, and every cylindrical battery of monomer's top utmost point post all is connected through the mode electricity of hot welding with the busbar, and this patent is just arranged the welding with cylindrical battery, does not solve battery stability and the uniformity problem behind the battery module of a plurality of battery constitution.

According to the technical scheme, the problem of electrolyte sharing is not well solved, and the problems of unbalanced battery quality and low yield exist.

Disclosure of Invention

In order to solve the technical problem, an adopted technical scheme is to provide an electrolyte sharing unit, where the sharing unit includes a plurality of subunits, each subunit includes a main circuit and a branch circuit, the main circuit is used to splice the subunits to form the sharing unit, the branch circuit is fixedly installed with a battery cell casing to inject the electrolyte into the battery cell casing, the main circuit includes a first connection end and a second connection end, and two adjacent subunits are fixedly spliced to form the electrolyte sharing unit through the first connection end and the second connection end, respectively.

Preferably, a communicating piece is arranged between the first connecting end and the second connecting end, the communicating piece comprises two communicating nozzles, the first connecting end and the second connecting end are respectively provided with a connecting port, and the communicating nozzles are fixedly connected with the connecting ports; or

The communicating piece comprises two communicating ports, the first connecting end and the second connecting end are respectively provided with a connecting nozzle, and the connecting nozzles are fixedly connected with the communicating ports.

Preferably, the communicating nozzle is nested in the connecting port, or the connecting nozzle is nested in the communicating port.

Preferably, a connecting port is arranged in the first connecting end, a connecting nozzle is arranged on the second connecting end, and the connecting nozzle can be embedded in the connecting port.

Preferably, the sub-unit comprises a blocking piece for blocking the first connecting end and/or the second connecting end.

In order to solve the technical problems, the technical scheme includes that the high-capacity battery is provided, and comprises a plurality of battery cells and a plurality of electrolyte sharing units, wherein the battery cells comprise a liquid injection part, and the branch circuits are fixedly connected with the liquid injection part to inject and share electrolyte to form the high-capacity battery; or the battery cell comprises a positive/negative pole provided with an electrolyte channel and two groups of electrolyte sharing units, and the branch is fixedly connected with the positive/negative pole to inject and share electrolyte to form a large-capacity battery.

Preferably, a film is arranged in the branch to seal the branch, and the film is soluble in electrolyte to dissolve the film when the shared unit and the liquid injection part are fixedly installed, so that the electrolyte in the shared unit is injected into the electric core.

Preferably, the film material is one or more of polymethyl methacrylate, silicon rubber, polypropylene carbonate, polyethylene oxide, polyacrylonitrile and polyvinyl alcohol.

Preferably, a protection film is further disposed on a side of the film facing the interior of the battery cell, the protection film seals the branch, the protection film is insoluble in the electrolyte, and when the film is dissolved in the electrolyte, the protection film falls off therewith, so that the branch is communicated with the interior of the battery cell.

The invention has the beneficial effects that: through the pipeline of concatenation shared electrolyte, the completion pipeline equipment that can be effectively convenient, be convenient for install pipeline and battery, and use on the square-shell battery, can open up on the utmost point post of square-shell battery, make this shared unit accomplish to annotate and act as the unified utmost point post of all square-shell batteries after the liquid task, simple structure, the equipment of being convenient for reduces the assembling procedure, and is effectual.

Drawings

FIG. 1 is a diagram illustrating a shared cell configuration according to an embodiment;

FIG. 2 is a schematic view of the structure of a communication member in one embodiment;

FIG. 3 is a diagram illustrating a structure of a sharing unit in one embodiment;

FIG. 4 is a schematic view of a structure of a communication member according to an embodiment;

FIG. 5 is a diagram illustrating the structure of a sharing unit in one embodiment;

FIG. 6 is a schematic view of the construction of a closure according to one embodiment;

FIG. 7 is a schematic view of the construction of a closure according to one embodiment;

fig. 8 is a schematic view of a structure of a large-capacity battery in one embodiment;

fig. 9 is a schematic view of a structure of a large-capacity battery in one embodiment;

fig. 10 is a schematic structural view of a large-capacity battery in one embodiment;

fig. 11 is a schematic structural view of a cell post;

fig. 12 is a schematic sectional structure view of a cell post;

fig. 13 is a schematic structural view of a large-capacity battery in one embodiment.

Reference numerals:

100-shared unit

101-main road

102-branch

101 a-connection port

101 b-connection port

101 c-connection nozzle

101 d-connection mouth

101 e-connection port

101 f-connection mouth

103A-communication member

103 a-communicating nozzle

103 b-communication nozzle

103B-communication member

103 c-communication port

103 d-communication port

104-closure part

104 a-blocking head

104 b-blocking mouth

104 c-fluid infusion port

105-closure

105 a-blocking head

105 b-plugging port

105 c-fluid infusion port

200-cell shell

12-pole

13-electrolyte channel

14-connecting part

15-film

151-film

152-fixed part

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

Hereinafter, the electrolyte sharing line and the large battery according to the present application are specifically disclosed in detail with reference to the accompanying drawings as appropriate. But detailed description thereof will be omitted unnecessarily. For example, detailed descriptions of well-known matters and repetitive descriptions of actually the same structures may be omitted. This is to avoid unnecessarily obscuring the following description, and to facilitate understanding by those skilled in the art. The drawings and the following description are provided for those skilled in the art to fully understand the present application, 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, if not specifically stated. All technical and optional features of the present application may be combined with each other to form new solutions, if not otherwise specified.

The terms "comprises" and "comprising" as used herein mean either open or closed unless otherwise specified. For example, "comprising" and "comprises" 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 to be understood that relational terms such as "first," "second," and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.

Example 1

As shown in fig. 1 to 7, this embodiment provides an electrolyte sharing unit 100, where the sharing unit 100 includes a plurality of sub-units, each sub-unit includes a main circuit 101 and a branch circuit 102, the main circuit 101 includes a first connection end and a second connection end, two adjacent sub-units are fixedly spliced through the first connection end and the second connection end, respectively, and the branch circuit 102 is fixedly mounted with a cell casing 200, so as to inject electrolyte into the cell casing 200, thereby forming the electrolyte sharing unit.

As shown in fig. 1 and 2, a communicating member 103 is arranged between the first connecting end and the second connecting end, the communicating member 103A includes a communicating nozzle 103A and a communicating nozzle 103b, the first connecting end and the second connecting end are respectively provided with a connecting port 101a and a connecting port 101b, the communicating nozzle 103A and the communicating nozzle 103b are fixedly connected with the connecting port 101a and the connecting port 101b, that is, the connecting port 101a is connected with the communicating nozzle 103A, and the connecting port 101b is fixedly connected with the communicating nozzle 103b, and after the assembly is completed, the communicating member is fixedly connected with other sub-units to form a sharing unit. The communication nozzle 103a and the connection nozzle 103b are respectively embedded in the

connectors

101a and 101b and are fixedly mounted in a screwing mode, a hot melting mode, a welding mode and the like, and the specific connection mode depends on the material of the sharing unit.

As shown in fig. 3 and 4, in some embodiments, the communicating member 103B includes two communicating

ports

103c and 103d, the first connecting end and the second connecting end are respectively provided with a connecting nozzle 101c and a connecting nozzle 101d, the connecting nozzles protrude from the main path, the connecting

nozzles

101c and 101d are fixedly connected with the communicating

ports

103c and 103d, that is, the connecting nozzle 101c is connected with the communicating port 103c, and the connecting nozzle 101d is connected with the communicating port 103d, and the shared unit 100 is formed after the assembly is completed and is fixedly connected with other sub-units. In this embodiment, the connection nozzle 101c is embedded in the communication port 103c, and the connection nozzle 101d is embedded in the communication port 103d, and the connection nozzles are fixedly mounted in a screwing manner, a hot melting manner, a welding manner, and the like, and the specific connection manner depends on the material of the sharing unit.

As shown in fig. 5, in some embodiments, a connection port 101e is disposed in the first connection end, a connection nozzle 101f is disposed on the second connection end, the connection nozzle 101e is nested in the connection port 101f to form a male-female interface, other sub-units are connected in the same manner, and are fixedly mounted by screwing, hot melting, welding, or the like, so as to form the sharing unit 100, where the specific connection manner depends on the material of the sharing unit.

As shown in fig. 6 and 7, in order to facilitate packaging of the shared unit, a blocking piece 104 and a blocking piece 105 are provided for blocking the edgemost main road. The plugging piece 104 has a plugging head 104a and a plugging mouth 104b, the diameter of the plugging mouth 104b is smaller than that of the main path, and the plugging piece is nested in the connecting port 101a or the connecting port 101b in the above embodiment; the plugging piece 105 is provided with a plugging head 105a and a plugging opening 105b, the diameter of the plugging opening 105b is at least equal to that of the main path, and the connecting nozzle 101c or the connecting nozzle 101d is nested in the plugging opening 105b in the embodiment; in some embodiments, the plugging member is further provided with a fluid infusion port, the fluid infusion port 104c of the plugging member 104 is provided on the plugging head 104a, and the fluid infusion port 105c of the plugging member 105 is provided on the plugging head 105 a. In some cases, as shown in fig. 3, the fluid infusion port protrudes from the surface of the plugging disc to facilitate the installation of the fluid infusion tube.

In some embodiments, the shared cells are made of metal to be conductive, while in other embodiments the shared cells are made of insulating material.

Example 2

As shown in fig. 8-10, the present embodiment provides a large-capacity battery, where the large-capacity battery includes a plurality of battery cells, each battery cell includes a liquid injection portion, and further includes the electrolyte sharing unit 100 provided in embodiment 1, and the liquid injection portion of the battery cell casing 200 is fixedly connected to the branch 102 of the sharing unit to inject and share electrolyte, so as to form the large-capacity battery. In this embodiment, the liquid injection part may be a vent hole of the primary cell, or may be a separately provided liquid injection hole. For example, when the battery cell is a soft-package battery cell, a separate shell and a liquid injection port need to be arranged, and if the battery cell is a square-shell battery cell, the original explosion venting port or the original pole is utilized.

Example 3

As shown in fig. 13, the present embodiment provides a large-capacity battery, the branch 102 of the sharing unit can be directly fixedly connected to two poles 12 of the battery core housing 200, the poles 12 are provided with an electrolyte channel, the electrolyte channel 13 is disposed in the poles 12, the electrolyte channel 13 is a through hole axially penetrating through the poles along the poles 13, and the electrolyte can be injected into the housing of the battery core 200 through the electrolyte channel 13. The pole 13 is further provided with a connecting portion 14, the connecting portion 14 is an external thread, and the external thread can be fixedly connected with an internal thread correspondingly arranged on the branch 102. In some cases, the connection portion 14 is internally threaded and the branch 102 is correspondingly externally threaded.

In some embodiments, a membrane 15 is provided within the post 12 for sealing the electrolyte passage 13. The thickness of the film is not more than 2mm, in some embodiments, the film 15 is easily pierced by a piercing part provided in the sharing unit, for example, during screwing process of the battery core with the thread on the branch 102 of the sharing unit through the thread of the connecting part 14, the piercing part provided at the electrolyte reservoir injection port and facing the pole 12 gradually approaches the film 15 and finally pierces the film 15, so that the electrolyte in the electrolyte reservoir is injected into the battery cell casing 200. In these embodiments, the material of the film 15 is at least one of copper, aluminum, PP, and PE.

In other embodiments, the material of the film is one or more of polymethyl methacrylate, silicone rubber, polyvinyl chloride, polycarbonate or ABS plastic, the film is soluble in the electrolyte, when the electrolyte in the electrolyte storage bin is injected into the electrical core housing through the pole 12, the film 15 soluble in the electrolyte is encountered, and the electrolyte enters the electrical core housing after the film 15 is dissolved. In some cases, in order to prevent the original electrolyte inside the cell from dissolving the film 15, a protective film 151 is further attached to the film 15 to seal the electrolyte passage, and the protective film 151 is insoluble in the electrolyte to prevent the electrolyte inside the cell casing from dissolving the film 15 in advance. When the film 15 is dissolved by the external electrolyte, the protective film 151 falls off, and the external electrolyte can enter the cell casing. The peeled protective film 151 enters the inside of the cell along with the electrolyte. In order not to affect the performance of the cell or the electrolyte, the protective film 151 should be as thin as possible, for example, less than 0.1mm.

In some embodiments, the membrane 15 is welded or bonded to a designated fixing portion of the electrolyte passage 13, which may be located at an end of the electrolyte passage 13 near the inlet, to seal the electrolyte passage 13. A stepped fixing portion 152 may be provided at an inlet of the electrolyte passage 13 for fixing the thin film 15. To further fix the film 15, an annular pressing member is further provided to press and fix the film 15 to the stepped fixing portion 152.

As shown in fig. 13, the cell casing 200 includes positive/negative poles provided with the electrolyte passages 13, and the branches 102 are fixedly connected to the connection portions of the positive/negative poles to inject and share the electrolyte, and at the same time, the sharing units serve as the positive and negative poles of the cell casing 200, eventually forming a large capacity battery.

The above summary of the present application is not intended to describe each disclosed embodiment or every implementation of the present application. The following description more particularly exemplifies illustrative embodiments. At various points throughout this application, guidance is provided through a list of embodiments that can be used in various combinations. In each instance, the list is merely a representative group and should not be construed as exhaustive.

Claims

1. The electrolyte sharing unit is characterized in that the sharing unit comprises a plurality of subunits, each subunit comprises a main circuit and a branch circuit, the main circuit is used for splicing the subunits to form the sharing unit, the branch circuits are fixedly installed with a cell shell and used for injecting electrolyte into the cell shell, each main circuit comprises a first connecting end and a second connecting end, and two adjacent subunits are fixedly spliced to form the electrolyte sharing unit through the first connecting end and the second connecting end respectively.

2. The electrolyte sharing unit according to claim 1, wherein a communicating member is arranged between the first connecting end and the second connecting end, the communicating member comprises two communicating nozzles, the first connecting end and the second connecting end are respectively provided with a connecting port, and the communicating nozzles are fixedly connected with the connecting ports; or

3. The electrolyte sharing unit of claim 2 wherein the communication nipple is nested within the connection port, or the connection nipple is nested within the communication port.

4. The electrolyte sharing unit of claim 1 wherein the first connection end is provided with a connection port and the second connection end is provided with a connection nipple nested within the connection port.

5. The electrolyte sharing unit according to claim 1 wherein the sub-unit comprises a blocking piece to block the first connection end and/or the second connection end.

6. A large-capacity battery is characterized by comprising a plurality of battery cores and a plurality of electrolyte sharing units according to any one of claims 1 to 5, wherein the battery cores comprise an electrolyte injection part, and the branches are fixedly connected with the electrolyte injection part to inject and share electrolyte to form the large-capacity battery; or

The high-capacity battery comprises a plurality of battery cells, the battery cells comprise positive and negative poles, the high-capacity battery also comprises two groups of electrolyte sharing units according to any one of claims 1 to 5, the sharing units can conduct electricity, and the branches are fixedly connected with the positive and negative poles to inject and share electrolyte to form the high-capacity battery.

7. The high-capacity battery according to claim 6, wherein a film is provided in the branch to seal the branch, and the film is soluble in an electrolyte to dissolve the film when the shared cell is fixedly mounted to the liquid injection part, so that the electrolyte in the shared cell is injected into the core.

8. A large capacity battery as defined in claim 7, wherein the membrane material is one or more of polymethyl methacrylate, silicone rubber, polypropylene carbonate, polyethylene oxide, polyacrylonitrile, and polyvinyl alcohol.

9. The high-capacity battery according to claim 8, wherein a protective film is further provided on a side of the film facing the inside of the battery cell, the protective film seals the branch circuit, the protective film is insoluble in the electrolyte, and when the film is dissolved in the electrolyte, the protective film is detached to communicate the branch circuit with the inside of the battery cell.