CN216529225U

CN216529225U - Air extractor for battery formation

Info

Publication number: CN216529225U
Application number: CN202122493220.0U
Authority: CN
Inventors: 李晓伟; 刘晓梅; 陈文伟
Original assignee: Jiangsu Contemporary Amperex Technology Ltd
Current assignee: Jiangsu Contemporary Amperex Technology Ltd
Priority date: 2021-10-15
Filing date: 2021-10-15
Publication date: 2022-05-13
Anticipated expiration: 2031-10-15

Abstract

The utility model provides an air extractor for battery formation, comprising: the battery comprises an air extracting tank and a condensing sheet, wherein the air extracting tank comprises an air extracting outlet and an air extracting inlet, the air extracting outlet is used for being connected with air extracting equipment, and the air extracting inlet is used for being connected with the inside of the battery; the condensation sheet is arranged in the air exhaust tank and is used for condensing gaseous battery electrolyte in the air exhaust tank. The condensation sheet is arranged in the air extraction tank and is used for condensing gaseous battery electrolyte in the air extraction tank, so that the battery electrolyte volatilized during battery formation can be collected through condensation, the loss of the battery electrolyte is reduced, and the quality of the battery is improved.

Description

Air extractor for battery formation

Technical Field

The utility model relates to the technical field of battery production, in particular to an air extractor for battery formation.

Background

The formation of the battery refers to a process of forming a passivation thin layer covering the surface of the negative electrode by reacting on a phase interface between the negative electrode and the electrolyte during the first charge of the battery, and the passivation thin layer is also referred to as a solid electrolyte phase interface or a solid SEI film (solid electrolyte interphase). The battery can generate a large amount of gas in the formation process, so that the battery can not be sealed immediately after being injected with electrolyte, and the gas generated in the formation process can be discharged in time. In the prior art, in order to accelerate the formation of the battery, after the electrolyte is injected into the battery, an air extractor is usually used to connect with the inside of the battery and extract air from the battery. However, the electrolyte of the battery contains many low boiling point components, which are easily volatilized and are drawn out together with the gases generated by the formation, resulting in loss of the electrolyte components and affecting the quality of the battery.

SUMMERY OF THE UTILITY MODEL

Therefore, it is necessary to provide an air extractor for battery formation to solve the above-mentioned technical problems that the components of the electrolyte are easily lost and the battery quality is affected in the battery formation.

In order to achieve the above object, the present invention provides an air extraction device for battery formation, comprising:

the air extracting tank comprises an air extracting outlet and an air extracting inlet, the air extracting outlet is used for being connected with air extracting equipment, and the air extracting inlet is used for being connected with the inside of the battery;

and the condensation sheet is arranged in the air exhaust tank and is used for condensing gaseous battery electrolyte in the air exhaust tank.

In the technical scheme, the condensing sheet is arranged in the air exhaust tank and used for condensing gaseous battery electrolyte in the air exhaust tank, so that the battery electrolyte volatilized when the battery is formed can be collected through condensation, the loss of the battery electrolyte is reduced, and the quality of the battery is improved.

Further, the condensing sheet level set up in the jar of bleeding, the entry of bleeding is located the below of condensing sheet, the export of bleeding is located the top of condensing sheet, be provided with the air vent on the condensing sheet, the air vent runs through the upper surface and the lower surface of condensing sheet.

In the above technical solution, the air suction inlet is located below the condensation sheet, the air suction outlet is located above the condensation sheet, and the condensation sheet is provided with a vent hole for gas to pass through, so that gas extracted from the inside of the battery must be condensed by the condensation sheet, thereby ensuring that volatilized battery electrolyte is in full contact with and condensed on the condensation sheet.

Furthermore, a first cooling liquid channel is arranged inside the condensation sheet.

In the technical scheme, the first cooling liquid channel is arranged in the condensation sheet, so that the condensation sheet can keep a lower temperature and has higher condensation efficiency.

And a second cooling liquid channel is arranged in the inner wall of the gas pumping tank and comprises a cooling liquid inlet and a cooling liquid outlet.

In the technical scheme, the second cooling liquid channel is arranged in the inner wall of the air pumping tank, so that the inside of the air pumping tank keeps a lower temperature, the battery electrolyte can be condensed through the inner wall of the air pumping tank, and the condensation efficiency of the battery electrolyte is improved.

The second coolant passage communicates with the first coolant passage.

In the above technical scheme, the second cooling liquid channel is communicated with the first cooling liquid channel, and the second cooling liquid channel can provide cooling liquid for the first cooling liquid channel, so that the arrangement and the circulation of the cooling liquid for the cooling liquid channel are facilitated.

The air pumping tank is a conical tank body, and the cross section area of the conical tank body is gradually increased from bottom to top; the air suction inlet is positioned at the bottom of the conical tank body.

In the technical scheme, the air pumping tank is a conical tank body, the air pumping inlet is positioned at the bottom of the conical tank body, the air pumping tank is small in size and is favorable for collecting and refluxing liquid battery electrolyte obtained by condensation to the inside of the battery.

The air exhaust outlet is arranged on the top edge of the conical tank body.

In the above technical scheme, the air exhaust outlet is arranged at the top edge of the conical tank body, so that the air in the air exhaust tank has a longer circulation path and can be fully contacted with the condensation sheet, and the condensation efficiency of the condensation sheet is improved.

The condensation sheet is circular, and the circumference of the condensation sheet is attached to the wall of the gas extraction tank; or

The condensation piece is polygonal, the angle of the condensation piece is connected with the inner wall of the gas pumping tank, and a baffle plate is arranged between the edge of the condensation piece and the inner wall of the gas pumping tank.

In the technical scheme, the condensing sheet can divide the air exhaust tank into an upper part and a lower part, and gas can flow out of the air exhaust outlet only through the condensing sheet, so that the condensing effect of the condensing sheet is ensured.

And the inner wall of the exhaust tank is provided with a hydrophobic coating.

In the technical scheme, the inner wall of the air pumping tank is provided with the hydrophobic coating, and the hydrophobic coating can reduce the adhesion of the battery electrolyte on the inner wall of the air pumping tank, so that the condensation effect of the inner wall of the air pumping tank can be ensured, and the inside of the battery electrolyte backflow battery is accelerated.

The condensing sheet includes more than two, more than two the condensing sheet is parallel to each other and interval sets up.

In the technical scheme, the plurality of layers of condensing sheets are arranged, so that the contact area between the gas in the pumping tank and the condensing sheets can be increased, and the condensing effect of the condensing sheets is improved.

Be different from prior art, above-mentioned technical scheme has set up the condensation piece in the inside of jar of bleeding, and the condensation piece is used for the condensation the gaseous state battery electrolyte in jar of bleeding to the accessible condensation collects the battery electrolyte that volatilizees when the battery ization becomes, and makes the battery electrolyte of condensation flow back to the inside of battery, thereby reduces the loss of battery electrolyte, improves the quality of battery.

Drawings

FIG. 1 is a schematic view of an evacuation device for battery formation according to an embodiment of the present disclosure in use;

FIG. 2 is a schematic perspective view of an evacuation device for battery formation according to an embodiment of the present disclosure;

FIG. 3 is a top view of a battery formation gas extraction device according to an embodiment of the present application;

FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3;

FIG. 5 is a cross-sectional view taken along line B-B of FIG. 4;

FIG. 6 is an enlarged view of a portion C of FIG. 4;

FIG. 7 is a schematic diagram of a configuration of two or more layers of condensation sheets and an air extraction tank according to an embodiment of the present disclosure;

description of reference numerals:

1. a battery;

2. an air extraction device for battery formation;

21. an air pumping tank;

211. a coolant inlet;

212. a coolant outlet;

213. a second coolant channel;

214. a coolant connection port;

22. a condensation sheet;

221. a shielding plate;

222. a first coolant passage;

223. a vent hole;

23. an air extraction inlet;

24. an air exhaust outlet;

Detailed Description

Embodiments of the present application will be described in further detail below with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the application and are not intended to limit the scope of the application, i.e., the application is not limited to the described embodiments. In the description of the present application, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like, indicate an orientation or positional relationship that is merely for convenience in describing the application and to simplify the description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the application. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. "vertical" is not strictly vertical, but is within the tolerance of the error. "parallel" is not strictly parallel but within the tolerance of the error.

In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood as appropriate by one of ordinary skill in the art.

When the battery is formed, in order to improve the efficiency of battery formation, after the battery is injected with electrolyte, an air extractor is connected to a liquid injection hole of the battery, so that the air extractor is communicated with the inside of the battery, and the inside of the battery is extracted through the air extractor. The applicant has found that the electrolyte of the cell contains a number of volatile components which are lost with the gases extracted by the extraction means. The applicant also finds that the existing battery formation air extraction device cannot effectively collect volatilized electrolyte components, and the electrolyte is not beneficial to flowing back to the inside of the battery due to the reasons that the pipeline of the air extraction device is long, the electrolyte is attached to the inner wall of the air extraction device and the like, so that the electrolyte inside the battery is insufficient, and the quality of the battery is affected.

Referring to fig. 1 to 7, the present embodiment provides an air extraction device for battery formation. As shown in fig. 1 and 2, the evacuation device for battery formation 2 includes an evacuation tank 21 and a condensation sheet 22. The air suction tank 21 includes an air suction outlet 24 and an air suction inlet 23, the air suction outlet 24 is used for connecting an air suction device, and the air suction inlet 23 is used for connecting the inside of the battery 1. The condensation sheet 22 is disposed in the exhaust tank 21, and the condensation sheet 22 is used for condensing gaseous battery electrolyte in the exhaust tank 21.

The air pumping tank 21 is a hollow closed tank, the air pumping tank 21 may be made of hard materials such as glass and stainless steel, and the air pumping outlet 24 and the air pumping inlet 23 are disposed on the wall of the air pumping tank 21 and are respectively communicated with the internal cavity of the air pumping tank 21. The air exhaust outlet 24 can be connected with an air exhaust device through a pipeline, and the air exhaust inlet can also be connected with a liquid injection hole of the battery 1 through a pipeline, so that the air exhaust tank 21 is connected with the interior of the battery 1. The suction device connected to the suction outlet 24 may be a vacuum pump, a peristaltic pump, or the like.

The condensation sheet 22 is disposed inside the pumping tank 21, and the gas in the pumping tank 21 can pass through the condensation sheet 22 and be condensed by the condensation sheet 22. The condensation sheet 22 may be made of a heat conductive metal or alloy such as copper, aluminum alloy, etc.; or the condensation sheet 22 can be made of heat-conducting non-metal material with smooth surface such as glass, ceramic and the like; the condensation sheet 22 may also be made of a mesh-like condensation mesh in some scenarios.

As shown in fig. 1, when the battery 1 is filled with the electrolyte to be formed, the air suction tank 21 is disposed above the battery 1, the air suction inlet 23 of the air suction tank 21 is connected to the liquid injection hole of the battery 1 through a pipeline, the air suction outlet 24 is connected to the air suction device through a pipeline, and the air suction tank 21 and the battery 1 are sucked by the air suction device. The gas generated when the battery 1 is formed is extracted out of the extraction tank 21 after passing through the extraction inlet 23, the condensation sheet 22, and the extraction outlet 24 in this order. When the gas passes through the condensation sheet 22, the battery electrolyte contained therein is condensed by the condensation sheet 22 and flows back to the inside of the battery 1.

In the above technical embodiment, the condensation sheet 22 is arranged in the air exhaust tank 21, the condensation sheet 22 is used for condensing the battery electrolyte in the air exhaust tank 21, and the volatilized battery electrolyte is collected by condensation when the battery is formed, so that the loss of the battery electrolyte is reduced, and the quality of the battery is improved.

As shown in fig. 2, in an embodiment, the condensation sheet 22 is horizontally disposed in the air pumping tank 21, and an edge of the condensation sheet 22 is connected to an inner wall of the air pumping tank 21, so that the condensation sheet 22 can be stably installed in the air pumping tank 21, wherein the condensation sheet 22 may be fixedly connected to the air pumping tank 21 or detachably connected thereto. The air suction inlet 23 is positioned below the condensation sheet 22, the air suction outlet 24 is positioned above the condensation sheet 22, and the condensation sheet 22 is provided with a vent hole 223 which penetrates through the upper surface and the lower surface of the condensation sheet 22. Wherein the bleed air inlet 23 may be located at the bottom of the bleed air tank 21 and the bleed air outlet 24 may be located at the top of the bleed air tank 21.

When the air extracting device connected with the air extracting outlet 24 is operated, the air of the air extracting tank 21 passes through the condensing sheet 22 through the vent hole 223 from below the condensing sheet 22, thereby condensing the battery electrolyte contained therein.

In the above embodiment, the suction inlet 23 is located below the condensation sheet 22, the suction outlet 2 is located above the condensation sheet 22, and the condensation sheet 22 is provided with the vent hole 223 for gas to pass through, so that the gas extracted from the inside of the battery 1 must be condensed by the condensation sheet 22 before being extracted to the outside of the suction tank 21, thereby ensuring that the volatilized battery electrolyte is sufficiently contacted and condensed with the condensation sheet 22.

As shown in fig. 2, 3 and 4, in an embodiment, the air pumping tank 21 is a conical tank body, and the cross-sectional area of the conical tank body gradually increases from bottom to top; the bleed air inlet 23 is located at the bottom of the conical canister and the bleed air outlet 24 is located at the top of the conical canister. That is, the pumping tank 21 is generally in a top-sealed funnel structure, and the pumping air inlet 23 is located at the bottom center of the funnel structure.

In the above-mentioned embodiment, the gas pumping tank 21 is a conical tank body, the inlet 23 of bleeding is located the bottom of the conical tank body, the gas pumping tank is small in size, small in occupied space, the gas pumping tank 21 is a conical tank body, the side wall of the gas pumping tank 21 is an inclined side wall, the side wall of the gas pumping tank 21 gradually draws close to the middle part from top to bottom, and finally the lowest position of the gas pumping tank 21 is converged, the inlet 23 of bleeding is arranged at the lowest position, and therefore liquid battery electrolyte which is beneficial to condensation is converged at the inlet 23 of bleeding, and the liquid battery electrolyte flows back to the inside of the battery through the pipeline connected with the inlet of bleeding. In other embodiments, the evacuation tank 21 may be a cylindrical tank, a hexahedral tank, or other tank.

As shown in FIGS. 2 and 3, in one embodiment, the bleed air outlet 24 is located at the top edge of the conical canister. The air exhaust outlet 24 is arranged at the top edge of the conical tank body, so that a longer circulation path is formed when air in the air exhaust tank 21 is exhausted, and the air and the condensation sheet 22 have longer contact time and contact area, so that full contact and condensation are realized, and the condensation efficiency of the condensation sheet 22 on the battery electrolyte is improved.

In some embodiments, in order to prevent condensed battery electrolyte from adhering to the inner wall of the extraction tank 21, a hydrophobic coating is provided inside the extraction tank 21. The hydrophobic coating is made of hydrophobic material, and the hydrophobic material comprises any one or combination of more than two of the following materials: silicone, organic fluorine polymer, polyolefin, polycarbonate, polyamide, polyacrylonitrile, polyester, fluorine-free acrylate, paraffin and other materials or modified coatings.

In the above embodiment, the inner wall of the air pumping tank 21 is provided with the hydrophobic coating, which can reduce adhesion of the battery electrolyte to the inner wall of the air pumping tank 21, so that the condensation effect of the inner wall of the air pumping tank 21 can be ensured, and the inside of the battery electrolyte backflow battery 1 can be accelerated.

As shown in fig. 4 and 5, in an embodiment, the air pumping tank 21 is a conical tank body, the condensation sheet 22 is rectangular, four corners of the condensation sheet 22 are connected with an inner wall of the air pumping tank 21, and shielding plates 221 are arranged between four sides of the condensation sheet 22 and the inner wall of the air pumping tank 21. The shielding plate 221 and the gas extraction tank 21 may be of an integral structure, that is, the shielding plate 221 is formed by extending the inner wall of the gas extraction tank 21 to the direction of the shielding plate 221; alternatively, the shielding plate 221 may be a separate member from the exhaust tank 21, the shielding plate 221 may be provided separately from the exhaust tank 21, the side of the shielding plate 221 close to the condensation sheet 22 is connected to the condensation sheet 22, and the side of the shielding plate 221 close to the inner wall of the exhaust tank 21 is connected to the inner wall of the exhaust tank 21. The gap between the rectangular condensation sheet 22 and the inner wall of the gas extraction tank 21 can be sealed through the shielding plate 221, so that the gas in the gas extraction tank 21 can pass through the condensation sheet 22.

In other embodiments, the condensation sheet 22 may also be a polygonal structure such as a triangle, a pentagon, a hexagon, etc., each corner of the condensation sheet 22 is connected to the inner wall of the exhaust tank 21, and a shielding plate 221 is disposed between each side of the condensation sheet 22 and the inner wall of the exhaust tank 21.

In other embodiments, the gas exhaust tank 21 is a conical tank body, the condensation sheet 22 is circular, and the circumference of the condensation sheet 22 is attached to the inner wall of the gas exhaust tank 21, so as to prevent the gas in the gas exhaust tank 21 from being exhausted to the outside of the gas exhaust tank 21 without passing through the condensation sheet 22.

In the above embodiment, the condensing sheet 22 may divide the air pumping tank 21 into an upper portion and a lower portion, and the air in the air pumping tank 21 may flow out from the air pumping outlet 24 only through the condensing sheet 22, so as to ensure the condensing effect of the condensing sheet 22.

As shown in fig. 2, 4, 5 and 6, in one embodiment, in order to improve the condensation effect of the condensation sheet 22, the condensation sheet 22 is provided with a first cooling liquid channel 222 inside the condensation sheet 22 in addition to the vent hole 223. The first cooling liquid channel 222 can be connected to a cooling liquid source, so that the first cooling liquid channel 222 is continuously communicated with cooling liquid with a lower temperature, and the cooling liquid keeps the condensation sheet 22 in a lower temperature range, for example, keeps the condensation sheet 22 in a range of 5-7 degrees, thereby having a better condensation effect. The first coolant channel 222 can be a serpentine coil that is disposed inside the condensation sheet 22 and the coolant flows in from one end of the serpentine coil and flows out from the other end. Alternatively, the first coolant passage 222 may be a hollow interlayer located inside the condensation sheet 22, and the hollow interlayer is provided with a coolant inlet and a coolant outlet, and the coolant flows into the hollow interlayer from the coolant inlet and flows out from the coolant outlet. In the above embodiment, the first cooling liquid channel 222 is provided inside the condensation sheet 22, so that the condensation sheet 222 can be maintained in a low temperature range, thereby having high condensation efficiency.

As shown in fig. 2, 4 and 5, in an embodiment, a second cooling liquid channel 213 is provided in the inner wall of the evacuation tank 21, and the second cooling liquid channel 213 includes a cooling liquid inlet 211 and a cooling liquid outlet 212. Wherein, the second cooling liquid channel 213 is similar to the first cooling liquid channel 222, and can adopt a serpentine coil structure or a hollow sandwich structure. The coolant inlet 211 may be provided on one side of the air pumping tank 21 in the horizontal direction, and the coolant outlet 212 may be provided on the other side of the air pumping tank 21 in the horizontal direction; and the coolant inlet 211 and the coolant outlet 212 are also provided at different positions on the suction tank 21 in the vertical direction. This makes the interval between the coolant inlet 211 and the coolant outlet 212 on the suction tank 21 longer, and makes the sweep exchange of the coolant with the suction tank 21 more sufficient. In the above embodiment, the second coolant passage 213 is provided in the inner wall of the gas suction tank 21, so that the inner wall of the gas suction tank 213 is kept at a low temperature, and the battery electrolyte can be condensed by the inner wall of the gas suction tank 21, thereby improving the condensation efficiency of the battery electrolyte.

As shown in fig. 4 and 5, in one embodiment, the second cooling liquid channel 213 is provided with a cooling liquid connection port 214, and the second cooling liquid channel 213 is connected with the first cooling liquid channel 222 through the cooling liquid connection port 214. The coolant connection port 214 is an opening formed in the second coolant passage 213, and is connected to a coolant inlet of the first coolant passage 222 through the opening, so that the coolant in the second coolant passage 213 can flow into the first coolant passage 222. In order to improve the sealing property of the connection between the coolant connection port 214 and the first coolant channel 222, a sealant may be applied to the outer periphery of the coolant connection port 214, or the first coolant channel 222 and the coolant connection port 214 may be connected by a rubber tube having a good sealing property.

A plurality of coolant connection ports 214 may be provided on the second coolant channel 213 to facilitate the flow of coolant from some of the coolant connection ports 214 into the first coolant channel 222, and then to allow the coolant in the first coolant channel 222 to flow back from other of the coolant connection ports 214 into the second coolant channel 213.

In the above embodiment, the second cooling liquid channel 213 is connected to the first cooling liquid channel 222 through the cooling liquid connection port 214, and the cooling liquid can be supplied to the first cooling liquid channel 222 through the second cooling liquid channel 213, so that the cooling liquid can be simultaneously supplied to the second cooling liquid channel 213 and the first cooling liquid channel 222 by only providing the cooling liquid inlet 211 and the cooling liquid outlet 212 on the outer wall of the air extraction tank 21, and the arrangement and the circulation of the cooling liquid channels are facilitated.

In other embodiments, the first cooling fluid channel 222 in the condensation sheet 22 and the second cooling fluid channel 213 in the inner wall of the air pumping tank 21 may be supplied with cooling fluid from different cooling fluid inlets and outlets, respectively.

In other embodiments, as shown in fig. 7, the condensation sheets 22 include two or more condensation sheets 22, and the two or more condensation sheets 22 are parallel to each other and spaced apart from each other. Wherein, the number of the condensation sheets 22 may not be two, three or more, and the condensation sheets 22 are arranged at intervals in the vertical direction. The distance between the adjacent condensing sheets 22 can be adjusted according to the sizes of the gas extraction tank 21 and the condensing sheets 22, and the larger the sizes of the gas extraction tank 21 and the condensing sheets 22 are, the larger the distance between the adjacent condensing sheets 22 is. Therefore, the gas in the gas pumping tank 21 needs to pass through the condensing sheets 22 from bottom to top in sequence before being pumped out of the gas pumping tank 21. The first cooling liquid channel 222 in the above embodiment may be provided inside each of the above-mentioned layers of condensation sheets 22, or the first cooling liquid channel 222 in the above embodiment may be provided only on a part of the other condensation sheets 22. In the above embodiment, the multiple layers of condensation sheets 22 are provided to increase the contact area between the gas in the gas pumping tank 21 and the condensation sheets 22, thereby improving the condensation effect of the condensation sheets 22.

In order to more intuitively understand the condensation effect of the air extraction device for battery formation on the battery electrolyte in the above embodiments, the applicant further provided the following test examples:

example 1

During formation, the existing air extractor for battery formation is selected to perform corresponding vacuumizing high-temperature formation on 15 hard shell lithium ion batteries respectively, wherein the temperature of the battery formation is 45 ℃, and the negative pressure value of the air extractor is-75 Kpa, the weight of the battery before and after formation is recorded, and the loss of the battery electrolyte is obtained by calculating the weight difference of the battery after formation.

Example 2

During formation, the extraction device for battery formation shown in fig. 5 and 6 is selected, wherein the condensation sheet 22 has the first cooling liquid channel 222, the number of the condensation sheets 22 is only one, that is, a single-layer condensation sheet, the condensation sheet 22 is rectangular, the extraction device for battery formation is used to perform corresponding vacuum-pumping and high-temperature formation on 15 hard shell lithium ion batteries, and other conditions are the same as those in embodiment 1.

Example 3

In the formation, the extraction device for cell formation shown in fig. 2 was used, wherein the condensation sheet 22 was not provided with the first cooling liquid channel 222, the number of the condensation sheets 22 was only one, the shape of the condensation sheet 22 was circular, and the other conditions were the same as those in example 1.

Example 4

During the formation, the battery formation air extractor having the multi-layer rectangular condensation sheet 22 shown in fig. 7 was used, and the remaining conditions were the same as in example 1.

Comparative example 1

During formation, an extraction device for cell formation without a condensation sheet is adopted, namely, the condensation sheet in the embodiment 1 is taken away, the extraction outlet 24 is arranged at the middle position of the top of the extraction tank 21, and other conditions and implementation are consistent with the embodiment 1.

Comparative example 2

During formation, the vacuum pump is directly connected with a pipeline to vacuumize and high-temperature form the corresponding battery, and other conditions are consistent with those of the embodiment 1.

From the test data of the above examples and comparative examples it can be seen that: the condensing sheet 22 is arranged in the air extracting tank 21 of the air extracting device for battery formation, so that the loss of the battery electrolyte can be reduced; the position of the condensation sheet 22 and the air exhaust outlet 24 can affect the condensation effect of the battery electrolyte, and if the condensation sheet 22 is not provided, the volatile electrolyte vapor in the battery 1 can be directly exhausted and lost.

Claims

1. An air extraction device for battery formation, comprising:

2. The extraction apparatus for battery formation according to claim 1, wherein the condensation sheet is horizontally disposed in the extraction tank, the extraction inlet is located below the condensation sheet, the extraction outlet is located above the condensation sheet, and a vent hole is disposed in the condensation sheet and penetrates through an upper surface and a lower surface of the condensation sheet.

3. The extraction apparatus for battery formation according to claim 1 or 2, wherein the condensation sheet is provided inside with a first cooling liquid channel.

4. The extraction apparatus for battery formation according to claim 3, wherein a second coolant channel is provided in the inner wall of the extraction tank, the second coolant channel comprising a coolant inlet and a coolant outlet.

5. The extraction apparatus for use in battery formation of claim 4, wherein the second coolant channel is in communication with the first coolant channel.

6. The extraction device for battery formation according to claim 1, wherein the extraction tank is a conical tank body, and the cross-sectional area of the conical tank body is gradually increased from bottom to top; the air suction inlet is positioned at the bottom of the conical tank body.

7. The extraction apparatus for battery formation of claim 6, wherein the extraction outlet is provided at the top edge of the conical can.

8. The extraction apparatus for battery formation according to claim 6 or 7, wherein the condensation sheet is circular, and the circumference of the condensation sheet is fitted to the wall of the extraction tank; or

9. An extraction apparatus for battery formation according to any of claims 1, 2, 5 to 7, characterised in that the inner wall of the extraction tank is provided with a hydrophobic coating.

10. The extraction apparatus for battery formation according to any one of claims 1, 2, 5 to 7, wherein the condensation sheet comprises two or more condensation sheets, and the two or more condensation sheets are parallel to each other and spaced apart from each other.