CN216750039U

CN216750039U - Formation structure for reducing electrolyte loss

Info

Publication number: CN216750039U
Application number: CN202220308392.8U
Authority: CN
Inventors: 未海峰; 孙冬; 晏子聪
Original assignee: Wuhu Etc Battery Ltd
Current assignee: Wuhu Etc Battery Ltd
Priority date: 2022-02-15
Filing date: 2022-02-15
Publication date: 2022-06-14
Anticipated expiration: 2032-02-15

Abstract

The utility model discloses a formation structure for reducing loss of electrolyte, which comprises a battery cell, a connecting pipe, a cache cup and a busbar connecting port, wherein one end of the connecting pipe is communicated with a battery cell liquid injection port of the battery cell, the other end of the connecting pipe is communicated with the cache cup, and the busbar connecting port is arranged at the top of the cache cup and is communicated with the cache cup. The formation structure of the utility model can effectively separate the extracted gas and liquid, and finally achieves the purpose of reducing the loss of the electrolyte.

Description

Formation structure for reducing electrolyte loss

Technical Field

The utility model belongs to the technical field of lithium ion battery manufacturing, and particularly relates to a formation structure for reducing electrolyte loss.

Background

With the rapid development of social economy, the development concept is continuously sublimed, and the new energy industry is actively developed based on the management and control of the environment. Among them, the new energy battery is attracting attention. The manufacturing process of the battery cell is not separated, namely, the battery is charged and discharged for the first time to form a Solid Electrolyte Interface (SEI) film on the surface of the anode. The purpose of formation is to form an SEI film, and how well the SEI film formation affects the cycle and life of a battery. However, the SEI film is mainly formed by decomposition of the electrolyte and is accompanied by generation of gas, which carries away a part of the electrolyte when discharged. The negative pressure formation is to timely extract the generated gas and prevent the swelling of the battery core. However, since part of the electrolyte is inevitably drawn out in the negative pressure formation process, the formation causes a loss of the electrolyte (an increase in the amount of electrolyte to be injected secondarily).

Because the gas production of electricity core formation process can take electrolyte out of the aluminum hull, and partial electrolyte can also be extracted to negative pressure simultaneously, the lost electrolyte can directly cause economic loss, consequently needs a more reasonable formation structure to reduce the loss volume of electrolyte. Because the existing formation process equipment structure is difficult to carry out gas-liquid separation, and the loss amount of the electrolyte is large, the formation structure is improved to be an effective method.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solve at least one of the problems of the prior art, and therefore, an object of the present invention is to provide a chemical structure for reducing the loss of an electrolyte solution, which has a simple structure and is easy to use.

In order to achieve the purpose, the technical scheme of the utility model is as follows: the utility model provides a reduce formation structure of electrolyte loss volume, includes electric core, connecting pipe, buffer memory cup and busbar connector, the one end of connecting pipe is annotated the liquid mouth with the electric core of electric core and is communicate, the other end and the buffer memory cup intercommunication of connecting pipe, the busbar connector set up at the top of buffer memory cup and with buffer memory cup intercommunication.

Furthermore, be equipped with inlet, gas outlet and liquid return mouth on the buffer memory cup, the inlet is located buffer memory cup side portion top, and the gas outlet is located the top of buffer memory cup, and the busbar connector is connected with the gas outlet, and the liquid return mouth is located the bottom of buffer memory cup.

Further, the connecting pipe includes pipe I and pipe II, and pipe I is the three-way pipe, and the one end of pipe I is annotated the liquid mouth with the electric core of electric core and is communicate, and the other end and the liquid return mouth intercommunication of pipe I, the one end and the I intercommunication of pipe II, the other end of pipe II insert in the inlet with the buffer memory cup intercommunication.

Furthermore, one end of the pipe II, which is inserted into the liquid inlet, is bent downwards, and the outlet direction of the pipe II in the buffer cup is downward.

Furthermore, the junction of pipe I and liquid return mouth is equipped with the check valve, and the check valve is closed in the formation process, and after the formation, closing negative pressure opened the check valve.

The technical scheme adopted by the utility model has the advantages that:

1. the formation structure of the utility model comprises a battery cell, a connecting pipe, a one-way valve, a buffer cup and a busbar connecting port from bottom to top in sequence. Different from traditional buffer memory cup structure, this formation structure can carry out gas-liquid separation effectively, is about to electrolyte and gas separately to reach the effect that reduces electrolyte loss volume.

2. The formation structure of the utility model can effectively separate the extracted gas and liquid, and finally achieves the purpose of reducing the loss of the electrolyte. Compared with the existing formation structure, the formation structure has the advantage of obviously reducing the loss of the formation electrolyte, and can control the loss of the 280Ah battery cell formation electrolyte within 10g (average value) from 30g before.

Drawings

The utility model is described in further detail below with reference to the following figures and detailed description:

FIG. 1 is a schematic diagram of a chemical structure according to the present invention;

FIG. 2 is a comparison histogram of electrolyte loss for the realized and comparative compositions.

The labels in the above figures are respectively: 1. an electric core; 2. a connecting pipe; 21. a pipe I; 22. a pipe II; 3. caching a cup; 31. a liquid inlet; 32. an air outlet; 33. a liquid return port; 4. a bus bar connection port; 5. a one-way valve.

Detailed Description

In the present invention, it is to be understood that the term "length"; "Width"; "Up"; "Down"; "front"; "Back"; "left"; "Right"; "vertical"; "horizontal"; "Top"; "bottom" "inner"; "outer"; "clockwise"; "counterclockwise"; "axial"; "planar direction"; "circumferential" and the like indicate orientations or positional relationships that are based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the indicated device or element must have a particular orientation; constructed and operative in a particular orientation and therefore should not be construed as limiting the utility model.

As shown in fig. 1 and 2, a formation structure for reducing electrolyte loss comprises an electric core 1, a connecting pipe 2, a buffer cup 3 and a busbar connecting port 4, wherein one end of the connecting pipe 2 is communicated with an electric core liquid injection port of the electric core 1, the other end of the connecting pipe 2 is communicated with the buffer cup 3, and the busbar connecting port 4 is arranged at the top of the buffer cup 3 and is communicated with the buffer cup 3.

Be equipped with inlet 31, gas outlet 32 and liquid return port 33 on the buffer memory cup 3, inlet 31 is located buffer memory cup 3 lateral part top, and gas outlet 32 is located buffer memory cup 3's top, and busbar connector 4 is connected with gas outlet 32, and liquid return port 33 is located buffer memory cup 3's bottom.

Connecting pipe 2 includes pipe I21 and pipe II 22, and pipe I21 is the three-way pipe, and the one end of pipe I21 and the electric core of electric core 1 annotate the liquid mouth intercommunication, and the other end and the liquid mouth 33 intercommunication that returns of pipe I21, the one end and the I21 intercommunication of pipe II 22, the other end of pipe II 22 insert in inlet 31 and buffer memory cup 3 intercommunication. The end of the tube II 22 inserted into the liquid inlet 31 is bent downwards, and the outlet of the tube II 22 in the buffer cup 3 is downward.

The junction of pipe I21 and liquid return port 33 is equipped with check valve 5, and formation in-process check valve 5 closes, and after the formation, closing negative pressure opened check valve 5.

The formation structure of the utility model comprises a battery cell, a connecting pipe, a one-way valve, a buffer cup and a busbar connecting port from bottom to top in sequence. Different from traditional buffer memory cup structure, this formation structure can carry out gas-liquid separation effectively, is about to electrolyte and gas separately to reach the effect that reduces electrolyte loss volume.

The specific working principle of the utility model is as follows: during negative pressure formation, gas and electrolyte are simultaneously pumped out from a pipeline connected with a liquid injection port of the battery core and flow to the buffer cup (the volume of the buffer cup is more than 60ml) in the arrow direction in the figure, and the one-way valve is always in a closed state during the formation process. When gas and electrolyte flow out from the pipeline in the buffer memory cup simultaneously, because the pipeline direction is downward, electrolyte directly falls in buffer memory cup bottom under the effect of gravity, and gas because the density ratio is less, will directly be by negative pressure suction top busbar pipeline. After the formation is finished, the negative pressure is closed, the one-way valve is opened, and the electrolyte in the buffer cup flows back to the battery cell again.

The formation structure of the utility model can effectively separate the extracted gas and liquid, and finally achieves the purpose of reducing the loss of the electrolyte. Compared with the existing formation structure, the formation structure has the advantage of obviously reducing the loss of the formation electrolyte, and can control the loss of the 280Ah battery cell formation electrolyte within 10g (average value) from 30g before.

Taking A, B two groups of 100 Ah battery cells (standing process before formation is finished), wherein the group A is a comparison group, namely the original mass production is adopted to form a structural group; group B is the experimental group, i.e. the structured group using the present invention. Weighing A, B two groups of cells before formation, and recording as W1; the cells were then formed at 45 degrees celsius. And after the formation is finished, the battery cell is subjected to post-weighing and is recorded as W2. The loss of electrolyte in the formation process is W1-W2, and the loss of electrolyte in A, B groups is measured through experiments and analyzed.

The experimental results are as follows: the electrolyte loss of the experimental group was 8.72g, and the electrolyte loss of the comparative group was 28.74g, as shown in FIG. 2.

The utility model is described above with reference to the accompanying drawings, it is obvious that the specific implementation of the utility model is not limited by the above-mentioned manner, and it is within the scope of the utility model to adopt various insubstantial modifications of the technical solution of the utility model or to apply the concept and technical solution of the utility model directly to other occasions without modification.

Claims

1. A formation structure for reducing electrolyte loss is characterized in that: including electric core (1), connecting pipe (2), buffer memory cup (3) and busbar connector (4), the one end of connecting pipe (2) is annotated the liquid mouth with the electric core of electric core (1) and is communicate, the other end and the buffer memory cup (3) intercommunication of connecting pipe (2), and busbar connector (4) set up at the top of buffer memory cup (3) and communicate with buffer memory cup (3).

2. The chemical structure of claim 1, wherein said chemical structure reduces a loss of electrolyte, said chemical structure comprising: be equipped with inlet (31), gas outlet (32) and liquid mouth (33) back on buffer memory cup (3), inlet (31) are located buffer memory cup (3) lateral part top, and gas outlet (32) are located the top of buffer memory cup (3), and busbar connector (4) are connected with gas outlet (32), and liquid mouth (33) are returned and are located the bottom of buffer memory cup (3).

3. The chemical structure of claim 2, wherein said chemical structure reduces a loss of electrolyte, said chemical structure comprising: connecting pipe (2) are including pipe I (21) and pipe II (22), and pipe I (21) are the three-way pipe, and the one end of pipe I (21) is annotated the liquid mouth with the electric core of electric core (1) and is communicate, and the other end and the liquid mouth (33) intercommunication of returning of pipe I (21), the one end and the pipe I (21) intercommunication of pipe II (22), and the other end of pipe II (22) inserts in inlet (31) and communicates with buffer memory cup (3).

4. A chemical structure for reducing the amount of electrolyte lost according to claim 3, wherein: one end of the pipe II (22) inserted into the liquid inlet (31) is bent downwards, and the outlet direction of the pipe II (22) in the buffer cup (3) is downward.

5. The chemical structure according to claim 3 or 4, wherein: the junction of pipe I (21) and returning the liquid mouth (33) is equipped with check valve (5), and formation in-process check valve (5) are closed, and after the formation, close the negative pressure, open check valve (5).