Pressurizing and infiltrating process for flexible package lithium battery

Abstract

The invention relates to a soft package lithium battery pressurization infiltration process which comprises the following steps: S1, opening a pressure bin valve, putting a soft package battery into a pressure bin, and keeping the pressure bin sealed; s2, a gas pressure source injects gas into a pressure bin through a gas valve for pressurization; s3, when the gas pressure reaches a certain pressure, the gas valve is closed; s4, after standing, opening a deflation valve for deflation; s5, repeating the steps 2-4 for at least three times, and taking out the soft package battery, the invention further provides a soft package lithium battery pressurizing and infiltrating device, gas is injected into a pressure bin through a gas pressure source to drive fan blades to rotate, a swing plate is driven to swing in a reciprocating manner, and meanwhile, a movable plate is driven to move in a reciprocating manner, so that the electrolyte is in full contact with a battery cell; therefore, the infiltration effect is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage battery equipment, and more particularly to a pressurized infiltration process for soft-packaged lithium batteries. Background Art

[0002] At present, during the production of soft-pack lithium batteries, electrolyte needs to be injected into the battery cell to soak the battery cell. Usually, the electrolyte is injected into the battery cell, and then the battery cell injected with electrolyte is naturally left to stand for more than 24 hours to 36 hours to meet the wetting effect between the electrolyte and the electrode and diaphragm in the battery, thereby improving the quality and performance of the battery. With the development of solid-state batteries and semi-solid-state lithium batteries, the viscosity of the electrolyte increases, and the iteration of technologies such as thermal recombination between the electrodes, the soaking time of the electrolyte is gradually lengthened.

[0003] Chinese patent publication number CN111540957A discloses a method and apparatus for impregnating battery cells with electrolyte. The method involves placing a battery cell filled with electrolyte on a rotating tray, which rotates with the tray. During rotation, the electrolyte within the cell is subjected to variable centrifugal force. Different centrifugal forces increase the number of times the electrolyte contacts the electrode, diaphragm, and other components within the cell, thereby improving the impregnation effect and shortening the time period for the electrolyte to fully impregnate the cell.

[0004] However, the inventors found that in the actual production process, the battery is left to stand naturally so that the electrolyte infiltrates the battery cell, which takes a long time, and the electrolyte contacts the electrode and the inner layer of the diaphragm in the battery cell less frequently, resulting in poor infiltration effect. Summary of the Invention

[0005] The purpose of the present invention is to address the shortcomings of the existing technology and provide a pressurized infiltration process for soft-packaged lithium batteries. After opening the pressure chamber valve to make the pressure chamber at atmospheric pressure, the soft-packaged battery is placed in the pressure chamber and kept sealed. Subsequently, the gas valve is opened, and gas is injected into the pressure chamber through a gas pressure source to pressurize the pressure. After the gas pressure reaches a certain pressure, the gas valve is closed. After standing, the gas valve is opened. The above steps are repeated at least 3 times and then the soft-packaged battery is taken out. Under the squeeze of the external gas pressure, the internal gas matrix of the soft-packaged battery quickly becomes smaller, and the electrolyte fills the space compressed by the internal gas, achieving the effect of rapid infiltration, increasing the number of contacts with the battery cell, and greatly reducing the infiltration time.

[0006] The technical solutions of the present invention are as follows:

[0007] A pressurized impregnation process for soft-packaged lithium batteries comprises the following steps:

[0008] S1. After opening the pressure chamber valve, place the soft-pack battery into the pressure chamber and keep the pressure chamber sealed;

[0009] S2, the gas pressure source injects gas into the pressure chamber through the gas valve to increase the pressure;

[0010] S3. When the gas pressure reaches a certain pressure, close the gas valve;

[0011] S4. After standing still, open the vent valve to release air;

[0012] S5. Repeat steps 2 to 4 at least three times, and then remove the soft-pack battery.

[0013] The present invention also provides a pressurized infiltration device for soft-packaged lithium batteries, which injects gas into the pressure chamber through a gas pressure source to drive the fan blades to rotate, drive the swing plate to swing back and forth, and drive the movable plate to move back and forth at the same time, so that the electrolyte is fully in contact with the battery cell, thereby improving the infiltration effect.

[0014] The technical solutions of the present invention are as follows:

[0015] A pressurized infiltration process for soft-package lithium batteries, wherein a rotating assembly and a swinging assembly driven by the rotating assembly are provided in the pressure chamber, the swinging assembly includes a swinging plate that is rotatably arranged in the pressure chamber, the swinging plate is provided with a moving assembly, the moving assembly includes a moving plate for carrying the soft-package battery, the rotating assembly is used to drive the swinging plate and the moving plate to swing back and forth when the gas pressure source injects gas, and the moving assembly drives the soft-package battery to move back and forth through the moving plate.

[0016] As a preference, the rotating assembly includes a rotating shaft rotatably arranged on the pressure chamber, a plurality of fan blades fixedly arranged on the rotating shaft, an air pipe fixedly arranged on the gas valve, and an air nozzle fixedly arranged on the air pipe.

[0017] As a preference, the swing assembly also includes a rotating shaft rotatably arranged on the pressure chamber, a first cam rotatably arranged in the pressure chamber, a second cam fixedly arranged on the swing plate, fixed plates fixedly arranged on both sides of the pressure chamber, and several springs fixedly arranged between the swing plate and the fixed plate. The rotating shaft is fixedly connected to the swing plate, the rotating shaft is rotatably matched with the rotating shaft, the first cam is matched with the second cam, and the rotating shaft is transmission-connected to the shaft of the first cam.

[0018] As a preferred embodiment, the moving component also includes sliding grooves opened on both sides of the swing plate, a slider slidingly set in the sliding groove, a reciprocating screw rotatably set on the swing plate, and a through groove opened on the moving plate. The slider is fixedly connected to the moving plate, the rotating shaft and the reciprocating screw are transmission-connected, and the through groove cooperates with the reciprocating screw.

[0019] As a preference, the spring is configured as a high-quality spring.

[0020] As a preference, a limit plate is provided on the movable plate.

[0021] As a preferred embodiment, a sealing gasket is provided on the pressure chamber valve.

[0022] The beneficial effects of the present invention are

[0023] 1. The present invention opens the pressure chamber valve, places the soft-pack battery into the pressure chamber and keeps the pressure chamber sealed, then opens the gas valve and gas pressure source, injects gas into the pressure chamber for pressurization, and closes the gas valve after the gas pressure reaches a certain pressure. After standing, open the gas valve, repeat the above steps for 5-45 minutes, and then take out the soft-pack battery. Under the squeeze of the external gas pressure, the internal gas matrix of the soft-pack battery quickly becomes smaller, and the electrolyte fills the space compressed by the internal gas, achieving the effect of rapid infiltration, increasing the number of contacts with the battery cell, and greatly reducing the infiltration time.

[0024] 2. The present invention is also provided with a swing assembly and a moving assembly. When the soft-pack battery is placed on the moving plate and gas is injected into the pressure chamber, the swing plate, the moving plate and the soft-pack battery are driven to swing back and forth, and at the same time, the moving plate and the soft-pack battery are driven to move back and forth on the swing plate, which greatly improves the electrolyte infiltration effect.

[0025] In summary, the present invention has the advantages of good wetting effect and short time, and is suitable for the technical field of energy storage battery equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below with reference to the accompanying drawings:

[0027] Figure 1 This is a schematic structural diagram of a pressurized impregnation device for soft-packaged lithium batteries;

[0028] Figure 2 It is a structural schematic diagram of the rotating component;

[0029] Figure 3 It is a structural diagram of the moving component and the swing component;

[0030] Figure 4 Schematic diagram of the cross-sectional structure of the rotating shaft;

[0031] Figure 5 is a schematic structural diagram of the first cam and the second cam;

[0032] Figure 6 The schematic diagram shows the state when the fan blades rotate and drive the swing plate to swing back and forth;

[0033] Figure 7 for Figure 5 Enlarged view of point A in the middle;

[0034] Figure 8 This is a schematic diagram of the state when the fan blade drives the movable plate to move back and forth;

[0035] Figure 9 for Figure 7 Enlarged view of point B in the middle;

[0036] Figure numerals: 1 pressure chamber valve, 2 soft-pack battery, 3 pressure chamber, 4 gas pressure source, 5 gas valve, 6 deflation valve, 7 rotating assembly, 71 rotating shaft, 72 fan blade, 73 air pipe, 74 air nozzle, 8 swing assembly, 81 swing plate, 82 rotating shaft, 83 first cam, 84 second cam, 85 fixed plate, 86 spring, 9 moving assembly, 91 moving plate, 92 slide groove, 93 slider, 94 reciprocating screw rod, 95 through groove, 10 limit plate. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the accompanying drawings.

[0038] Example 1

[0039] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0040] A pressurized impregnation process for soft-packaged lithium batteries comprises the following steps:

[0041] S1. After opening the pressure chamber valve 1, place the soft-pack battery 2 into the pressure chamber 3 and keep the pressure chamber 3 sealed;

[0042] S2, the gas pressure source 4 injects gas into the pressure chamber 3 through the gas valve 5 to increase the pressure;

[0043] S3, when the gas pressure reaches a certain pressure, close the gas valve 5;

[0044] S4, after standing still, open the vent valve 6 to release air;

[0045] S5. Repeat steps 2 to 4 at least 3 times, then remove the soft pack battery 2.

[0046] Example 2

[0047] like Figures 1 to 9As shown, a pressurized infiltration device for soft-pack lithium batteries is provided. A rotating assembly 7 and a swinging assembly 8 driven by the rotating assembly 7 are provided in the pressure chamber 3. The swinging assembly 8 includes a swinging plate 81 rotatably provided in the pressure chamber 3. A moving assembly 9 is provided on the swinging plate 81. The moving assembly 9 includes a moving plate 91 for carrying the soft-pack battery 2. The rotating assembly 7 is used to drive the swinging plate 81 and the moving plate 91 to swing back and forth when the gas pressure source 4 injects gas. The moving assembly 9 drives the soft-pack battery 2 to move back and forth through the moving plate 91.

[0048] It is worth mentioning that Figure 2 As shown, the rotating assembly 7 includes a rotating shaft 71 rotatably arranged on the pressure chamber 3, a plurality of fan blades 72 fixedly arranged on the rotating shaft 71, an air pipe 73 fixedly arranged on the gas valve 5, and a gas nozzle 74 fixedly arranged on the air pipe 73. When in use, after the pressure chamber valve 1 is opened, the soft-pack battery 2 is placed on the movable plate 91, the gas valve 5 is opened, and then the gas pressure source 4 is opened. The gas is blown out through the gas valve 5, the air pipe 73 and the gas nozzle 74, driving the fan blades 72 and the rotating shaft 71 to rotate, thereby driving the soft-pack battery 2 to swing back and forth and move.

[0049] In addition, if Figures 5 to 7 As shown, the swing assembly 8 also includes a rotating shaft 82 rotatably arranged on the pressure chamber 3, a first cam 83 rotatably arranged in the pressure chamber 3, a second cam 84 fixedly arranged on the swing plate 81, a fixed plate 85 fixedly arranged on both sides of the pressure chamber 3, and a plurality of springs 86 fixedly arranged between the swing plate 81 and the fixed plate 85. The rotating shaft 82 is fixedly connected to the swing plate 81, the rotating shaft 71 rotates with the rotating shaft 82, the first cam 83 cooperates with the second cam 84, and the rotating shaft 71 is transmission-connected with the shaft of the first cam 83. The shaft of the first cam 83 and the rotating shaft 82 are both provided with pulleys and the pulleys are provided with belts. When in use, when the fan blade 72 rotates, the first cam 83 is driven to rotate by the belt. During the rotation process, the first cam 83 drives the swing plate 81 to swing back and forth in cooperation with the second cam 84 and the spring 86, thereby improving the contact effect between the electrolyte and the battery cell.

[0050] It should be emphasized that if Figure 8 and Figure 9As shown, the moving assembly 9 also includes a slide groove 92 opened on both sides of the swing plate 81, a slider 93 slidingly set in the slide groove 92, a reciprocating screw rod 94 rotatably set on the swing plate 81, and a through groove 95 opened on the moving plate 91. The slider 93 is fixedly connected to the moving plate 91, and the rotating shaft 71 and the reciprocating screw rod 94 are transmission-connected. The through groove 95 cooperates with the reciprocating screw rod 94. Among them, the rotating shaft 71 and the reciprocating screw rod 94 are both provided with pulleys and the pulleys are provided with belts. When in use, when the fan blades 72 rotate, the reciprocating screw rod 94 is driven to rotate by the belt, thereby driving the moving plate 91 to reciprocate on the swing plate 81, thereby improving the infiltration effect of the electrolyte on the battery cell.

[0051] It should be further explained that if Figure 3 As shown, the spring 86 is set to a high-quality spring, which allows the swing plate 81 to maintain balance when it is stationary. At the same time, when one side of the swing plate 81 is pressed down and the first cam 83 disengages from the second cam 84, the swing plate 81 is reset under the action of the spring 86, thereby achieving a swinging effect.

[0052] It is worth mentioning that Figure 2 As shown, a limiting plate 10 is provided on the movable plate 91 , and the soft-pack battery 2 is limited by the limiting plate 10 .

[0053] Further, such as Figure 1 As shown, a sealing gasket is provided on the pressure chamber valve 1 to improve the sealing effect of the pressure chamber 3.

[0054] Working process

[0055] After opening the pressure chamber valve 1 to make the pressure chamber 3 at atmospheric pressure, place the soft-pack battery 2 in the pressure chamber 3 and keep it sealed. Then open the gas valve 5, inject gas into the pressure chamber 3 through the gas pressure source 4 to pressurize it. After the gas pressure reaches a certain pressure, close the gas valve 5. After standing, open the vent valve 6. Repeat the above steps at least 3 times to complete the infiltration. Take out the soft-pack battery 2. Under the squeeze of the external gas pressure, the internal gas matrix of the soft-pack battery 2 quickly becomes smaller, and the electrolyte fills the space compressed by the internal gas, achieving the effect of rapid infiltration and increasing the contact with the battery cell. The number of contacts greatly reduces the infiltration time. At the same time, the gas pressure source 4 blows the gas through the gas valve 5, the air pipe 73 and the air nozzle 74, driving the fan blade 72 and the rotating shaft 71 to rotate. The fan blade 72 drives the first cam 83 to rotate through the belt. During the rotation process, the first cam 83 cooperates with the second cam 84 and the spring 86 to drive the swing plate 81 to swing back and forth. At the same time, the fan blade 72 drives the reciprocating screw rod 94 to rotate, thereby driving the movable plate 91 to move back and forth on the swing plate 81, thereby improving the infiltration effect of the electrolyte on the battery cell.

[0056] In the description of the present invention, it should be understood that the terms "front and back", "left and right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the equipment or components referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the invention.

[0057] Of course, in this technical solution, those skilled in the art should understand that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0058] The above description in conjunction with the accompanying drawings is only a preferred embodiment of the present invention, but the present invention is not limited to the above embodiment. It should be pointed out that for those skilled in the art, various modifications and improvements can be made without departing from the structure of the present invention. These should also be regarded as the scope of protection of the present invention and will not affect the effect and practicality of the implementation of the present invention.

Claims

1. A pressurized infiltration process for soft-packaged lithium batteries, comprising the following steps: S1. After opening the pressure chamber valve (1), place the soft pack battery (2) into the pressure chamber (3) and keep the pressure chamber (3) sealed; S2, the gas pressure source (4) injects gas into the pressure chamber (3) through the gas valve (5) to increase the pressure; S3, when the gas pressure reaches a certain pressure, close the gas valve (5); S4, after standing still, open the vent valve (6) to release air; S5. After steps 2 to 4 are repeated at least 3 times, the soft-pack battery (2) is taken out.

2. An infiltration device for the pressurized infiltration process of the soft-package lithium battery according to claim 1, characterized in that: The pressure chamber (3) is provided with a rotating assembly (7) and a swing assembly (8) driven by the rotating assembly (7). The swing assembly (8) includes a swing plate (81) that is rotatably arranged in the pressure chamber (3). A moving assembly (9) is provided on the swing plate (81). The moving assembly (9) includes a moving plate (91) for carrying the soft-pack battery (2). The rotating assembly (7) is used to drive the swing plate (81) and the moving plate (91) to swing back and forth when the gas pressure source (4) injects gas. The moving assembly (9) drives the soft-pack battery (2) to move back and forth via the moving plate (91).

3. The pressurized infiltration device for soft-packaged lithium batteries according to claim 2, characterized in that: The rotating assembly (7) comprises a rotating shaft (71) rotatably arranged on the pressure chamber (3), a plurality of fan blades (72) fixedly arranged on the rotating shaft (71), an air pipe (73) fixedly arranged on the gas valve (5), and an air nozzle (74) fixedly arranged on the air pipe (73).

4. The pressurized infiltration device for soft-packaged lithium batteries according to claim 3, characterized in that: The swing assembly (8) further comprises a rotating shaft (82) rotatably arranged on the pressure chamber (3), a first cam (83) rotatably arranged in the pressure chamber (3), a second cam (84) fixedly arranged on the swing plate (81), fixed plates (85) fixedly arranged on both sides of the pressure chamber (3), and a plurality of springs (86) fixedly arranged between the swing plate (81) and the fixed plates (85); the rotating shaft (82) is fixedly connected to the swing plate (81); the rotating shaft (71) is rotatably matched with the rotating shaft (82); the first cam (83) is matched with the second cam (84); and the rotating shaft (71) is transmission-connected to the shaft of the first cam (83).

5. The pressurized impregnation device for soft-packaged lithium batteries according to claim 3, characterized in that: The moving assembly (9) further comprises a slide groove (92) provided on both sides of the swing plate (81), a slider (93) slidably provided in the slide groove (92), a reciprocating screw rod (94) rotatably provided on the swing plate (81), and a through groove (95) provided on the moving plate (91); the slider (93) is fixedly connected to the moving plate (91); the rotating shaft (71) is transmission-connected to the reciprocating screw rod (94); and the through groove (95) cooperates with the reciprocating screw rod (94).

6. The pressurized impregnation device for soft-packaged lithium batteries according to claim 4, characterized in that: The spring (86) is configured as a high-quality spring.

7. The pressurized impregnation device for soft-packaged lithium batteries according to claim 2, characterized in that: A limiting plate (10) is provided on the movable plate (91).

8. The pressurized impregnation device for soft-packaged lithium batteries according to claim 2, characterized in that: A sealing gasket is provided on the pressure chamber valve (1).

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