Electrolyte infiltration system and battery manufacturing device
By using a low-voltage infiltration module in battery manufacturing, the electrolyte is vaporized pre-impregnation and liquid re-impregnation are solved, and the electrolyte is infiltrated for a long time and high cost are achieved, and the electrolyte is infiltrated quickly and effective electrolyte is infiltrated, reducing production costs.
Patent Information
- Application Number
- CN202421349108.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-13
- Publication Date
- 2025-04-01
- Estimated Expiration
- 2034-06-13
AI Technical Summary
In the existing battery manufacturing technology, the electrolyte has a long wetting time, which leads to high production costs and is difficult to meet the needs of higher surface density and lower compaction.
Using a low-voltage infiltration module, the electrolyte is vaporized through the first negative pressure chamber and pre-immerses the battery cell. The vaporized electrolyte is used to quickly enter the capillary pores of the positive electrode sheet, negative electrode sheet and separator of the battery cell, and then the liquid electrolyte is injected for re-immersion.
It greatly shortens the wetting time of the electrolyte, improves the wetting speed and effect, reduces the damage to the battery cell by traditional mechanical vibration methods, and reduces production costs.
Smart Images
Figure CN222705788U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of battery manufacturing, in particular to an electrolyte infiltration system and a battery manufacturing device. Background Art
[0002] The rapid development of the new energy vehicle industry has put forward higher and higher requirements for the endurance of power batteries, which easily leads to the surface density of the dressing approaching the upper limit of the battery product design, and increases the difficulty of electrolyte infiltration of battery pole pieces and diaphragms. After the battery is filled with liquid, it needs to be left at high temperature for a long time to allow the electrolyte to fully infiltrate the positive and negative pole pieces and diaphragms. The industry often uses 45±5℃ high temperature standing for 24 to 72 hours to achieve electrolyte infiltration. However, with the demand for higher surface density and lower compaction, the electrolyte infiltration time is getting longer and longer, and the production cost is also getting higher and higher. If the requirements for electrolyte infiltration of positive and negative pole pieces cannot be met, the electrolyte composition will be changed on this basis to reduce the viscosity of the electrolyte and improve the wetting performance of the battery. Therefore, it is urgent to develop an electrolyte infiltration technology that reduces the infiltration process time, saves process steps, and reduces the cost of battery manufacturing. Utility Model Content
[0003] The main purpose of the utility model is to provide an electrolyte infiltration system and a battery manufacturing device, aiming to improve the electrolyte infiltration speed and infiltration effect.
[0004] Therefore, the first aspect of the utility model provides an electrolyte infiltration system, the electrolyte infiltration system comprising a low-pressure infiltration module for infiltrating a battery with electrolyte;
[0005] The low-pressure infiltration module includes a first liquid injection device, a first negative pressure chamber and a battery cell storage device, the first liquid injection device is connected to the first negative pressure chamber, the battery cell storage device is used to provide battery cells, and the first negative pressure chamber is connected to the first liquid injection port of the battery cell.
[0006] In some embodiments of the present invention, a first valve is provided between the first liquid injection device and the first negative pressure chamber, and a second valve is provided between the first negative pressure chamber and the battery cell storage device.
[0007] In some embodiments of the present invention, when the low-pressure infiltration module is in operation, the pressure range of the first negative pressure chamber is -50 KPa to -90 KPa.
[0008] In some embodiments of the present invention, the low-pressure infiltration module also includes a second negative pressure chamber and a second liquid injection device, one end of the second negative pressure chamber is connected to the second liquid injection port of the battery cell, and the other end of the second negative pressure chamber is connected to the second liquid injection device.
[0009] In some embodiments of the present invention, when the low-pressure infiltration module is in operation, a pressure difference is formed between the first negative pressure chamber and the second negative pressure chamber.
[0010] In some embodiments of the present invention, when the low-pressure infiltration module is in operation, the pressure range of the second negative pressure chamber is -50 KPa to -90 KPa.
[0011] In some embodiments of the present invention, the pressure difference between the first negative pressure chamber and the second negative pressure chamber is ≥10 KPa.
[0012] In some embodiments of the present invention, a third valve is provided between the second negative pressure chamber and the battery cell storage device, and a fourth valve is provided between the second negative pressure chamber and the second liquid injection device.
[0013] In some embodiments of the present invention, the first liquid injection port and the second liquid injection port of the battery cell are arranged diagonally.
[0014] The utility model also provides a battery manufacturing device, which includes the electrolyte infiltration system as described above.
[0015] Beneficial effects of the utility model:
[0016] The electrolyte infiltration system of the utility model includes a low-pressure infiltration module, which is provided with a first liquid injection device, a first negative pressure chamber and a battery cell storage device. The first negative pressure chamber can be used to vaporize the electrolyte to pre-infiltrate the battery cell placed in the battery cell storage device. The vaporized electrolyte is easy to enter the positive electrode sheet, the negative electrode sheet and the pores of the diaphragm of the battery cell, and can efficiently and quickly free the electrolyte in the entire shell of the battery cell, accelerate the infiltration of the pores of the electrode sheet and the pores of the diaphragm, and effectively solve the problem of poor electrolyte infiltration. After completing the pre-infiltration of the battery, the liquid electrolyte is injected into the battery cell for re-infiltration, which can greatly shorten the infiltration time of the electrolyte and reduce the damage to the battery cell caused by traditional mechanical vibration. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.
[0018] Figure 1 This is a schematic diagram of a low-pressure infiltration module according to an embodiment of the present utility model;
[0019] Figure 2This is a schematic diagram of a low-pressure infiltration module according to another embodiment of the present utility model;
[0020] Figure 3 This is a schematic diagram of the structure of a battery cell according to an embodiment of the utility model.
[0021] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings.
[0022] Description of labels:
[0023] Electrolyte Wetting System 100 Low pressure infiltration module 10 The first injection device 11 First Valve 12 The first negative pressure room 13 Second valve 14 Battery storage device 15 The third valve 16 Second negative pressure room 17 The fourth valve 18 Second injection device 19 Battery Cell 200 First filling port 210 Second injection port 220 DETAILED DESCRIPTION
[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0025] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
[0026] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0027] In addition, in the present utility model, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.
[0028] A first aspect of the utility model provides an electrolyte infiltration system.
[0029] The electrolyte infiltration system 100 of the utility model comprises a low-pressure infiltration module 10, which is used for infiltrating the battery with electrolyte and has the function of vaporizing the electrolyte so that the vaporized electrolyte pre-infiltrates the battery cell 200 of the battery.
[0030] The electrolyte pre-wetting function of the low-pressure infiltration module 10 of the present invention can be understood as preliminarily wetting the battery cell with a vaporized electrolyte, and then re-wetting the battery cell with a liquid electrolyte after the pre-wetting is completed.
[0031] Reference Figure 1 The low-pressure infiltration module 10 of the utility model includes a first liquid injection device 11, a first negative pressure chamber 13 and a battery cell storage device 15. The first liquid injection device 11 is connected to the first negative pressure chamber 13, the battery cell storage device 15 is used to provide the battery cell 200, and the first negative pressure chamber 13 is connected to the first liquid injection port 210 of the battery cell 200.
[0032] In the low-pressure infiltration module 10, the first liquid injection device 11 is used to hold and collect electrolyte, and allow the electrolyte to enter the first negative pressure chamber 13. The first negative pressure chamber 13 can vaporize the electrolyte by controlling the pressure in the chamber, and use the vaporized electrolyte to pre-infiltrate the battery cell 200 placed in the battery cell storage device 15. The vaporized electrolyte is easy to enter the capillaries of the positive electrode sheet, the negative electrode sheet and the diaphragm of the battery cell 200, and can efficiently and quickly free the electrolyte in the entire shell of the battery cell 200, accelerate the infiltration of the electrode sheet pores and the diaphragm pores, and effectively solve the problem of poor electrolyte infiltration. After completing the pre-infiltration of the battery, liquid electrolyte is injected into the battery cell 200 for re-infiltration. After pre-infiltration with the vaporized electrolyte, the infiltration time of the electrolyte into the battery cell 200 can be greatly reduced, and the damage to the battery cell 200 caused by traditional mechanical vibration can be reduced.
[0033] In some embodiments, when the low-pressure infiltration module 10 is in operation, the pressure range of the first negative pressure chamber 13 is -50KPa to -90KPa, which can be any value in the range of -50KPa to -90KPa, such as -50KPa, -60KPa, -70KPa, -80KPa, etc. In this embodiment, the pressure in the first negative pressure chamber 13 is controlled to be -50KPa to -90KPa to vaporize the electrolyte in the chamber, and the vaporized electrolyte is used to pre-infiltrate the battery cell 200, thereby solving the problem of poor electrolyte infiltration.
[0034] In some embodiments, continue to refer to Figure 1A first valve 12 is provided between the first liquid injection device 11 and the first negative pressure chamber 13, and a second valve 14 is provided between the first negative pressure chamber 13 and the battery cell storage device 15. The first valve 12 is used to control the flow of electrolyte between the first liquid injection device 11 and the first negative pressure chamber 13, and the second valve 14 is used to control the flow between the first negative pressure chamber 13 and the battery cell storage device 15.
[0035] In some embodiments, when the battery cell is pre-wetted with vaporized electrolyte, the first valve 12 is opened and the second valve 14 is closed to allow the electrolyte in the first liquid injection device 11 to flow into the first negative pressure chamber 13, and the pressure in the first negative pressure chamber 13 is adjusted to vaporize the electrolyte, and the second valve 14 is opened to allow the vaporized electrolyte to enter the battery cell storage device 15 to pre-wet the battery cell 200 in the battery cell storage device 15.
[0036] In the utility model, after the pre-wetting of the battery core 200 with the vaporized electrolyte is completed using the low-pressure infiltration module (10), the battery core 200 is re-wetted with the liquid electrolyte to complete the electrolyte infiltration of the battery core 200.
[0037] In some embodiments, the negative pressure environment in the battery cell 200 can be broken, the battery cell 200 can be removed from the battery cell storage device 15, and then liquid electrolyte can be injected into the battery cell 200 for re-infiltration.
[0038] In other embodiments, the low-pressure infiltration module 10 may also be used to perform re-infiltration of the liquid electrolyte.
[0039] Exemplarily, relative to the ground, the height of the first negative pressure chamber 13 is higher than the height of the battery cell storage device 15, so that a height difference is formed between the first negative pressure chamber 13 and the battery cell storage device 15, and gravity is used to cause the liquid electrolyte in the first negative pressure chamber 13 to flow into the battery cell storage device 15 to re-infiltrate the battery cells 200.
[0040] Exemplarily, a pressure difference may be formed between the first negative pressure chamber 13 and the battery cell storage device 15 to cause the liquid electrolyte in the first negative pressure chamber 13 to flow into the battery cell storage device 15 to re-wet the battery cells 200 .
[0041] In some embodiments, reference Figure 2The low-pressure infiltration module 10 further includes a second negative pressure chamber 17 and a second injection device 19, one end of the second negative pressure chamber 17 is in communication with the second injection port 220 of the battery cell 200, and the other end of the second negative pressure chamber 17 is in communication with the second injection device 19. In the present embodiment, the first injection port 210 and the second injection port 220 of the battery cell 200 penetrate the interior of the battery cell, and the electrolyte can flow into the interior of the battery cell from the first injection port 210 and flow out from the second injection port 220, or flow into the interior of the battery cell from the second injection port 220 and flow out from the first injection port 210. In the present embodiment, the second injection device 19 can also be used to hold and collect the electrolyte, and allow the electrolyte to enter the second negative pressure chamber 17, and the second negative pressure chamber 17 can also vaporize the electrolyte by controlling the pressure and allow the vaporized electrolyte to pre-infiltrate the battery cell 200.
[0042] In some embodiments, the pressure range of the second negative pressure chamber 17 is -50KPa to -90KPa, and can be any value in the range of -50KPa to -90KPa, such as -50KPa, -60KPa, -70KPa, -80KPa, etc. In this embodiment, the pressure in the second negative pressure chamber 17 is controlled to be -50KPa to -90KPa to vaporize the electrolyte in the chamber, and the battery cell is pre-wetted with the vaporized electrolyte to solve the problem of poor electrolyte wetting.
[0043] In this embodiment, the low-pressure infiltration module 10 can not only vaporize the electrolyte to achieve pre-infiltration, but also promote the flow of the electrolyte.
[0044] In some embodiments, when the low-pressure infiltration module 10 is in operation, a pressure difference is formed between the first negative pressure chamber 13 and the second negative pressure chamber 17, the flow of the electrolyte is controlled, and the electrolyte is caused to flow through the battery cell storage device 15 to infiltrate the battery cell 200. Exemplarily, when the low-pressure infiltration module 10 is in operation, the air pressure in the first negative pressure chamber 13 is controlled to be higher than the air pressure in the second negative pressure chamber 17, the electrolyte enters the first negative pressure chamber 13 from the first injection device 11, enters the battery cell storage device 15 from the first negative pressure chamber 13 and flows into the battery cell 200 from the first injection port 210 of the battery cell 200 to infiltrate the battery cell 200, and the excess electrolyte flows out from the second injection port 220 of the battery cell 200 into the second negative pressure chamber 17 and is collected by the second injection device 19. Again, exemplarily, when the low-pressure infiltration module 10 is in operation, the air pressure in the first negative pressure chamber 13 is lower than the air pressure in the second negative pressure chamber 17, the electrolyte enters the second negative pressure chamber 17 from the second injection device 19, enters the battery cell storage device 15 from the second negative pressure chamber 17, and flows into the battery cell 200 from the second injection port 220 of the battery cell 200, infiltrating the battery cell 200, and the excess electrolyte flows out from the first injection port 210 of the battery cell 200 into the first negative pressure chamber 13, and is collected by the first injection device 11. In this embodiment, it is suitable for both pre-infiltration of the battery cell 200 with a vaporized electrolyte and re-infiltration of the battery cell 200 with a liquid electrolyte.
[0045] In some embodiments, the pressure difference between the first negative pressure chamber 13 and the second negative pressure chamber 17 is ≥10KPa, and can be 10KPa, 20KPa, 30KPa, etc. Under the above pressure difference conditions, the vaporized electrolyte can be efficiently and quickly freed in the entire battery cell shell, accelerating the infiltration of the electrode pores and the diaphragm pores, so that the vaporized electrolyte can quickly form a uniform distribution inside and outside the battery cell 200, which effectively solves the problem of poor electrolyte infiltration.
[0046] In some embodiments, continue to refer to Figure 2 A third valve 16 is provided between the second negative pressure chamber 17 and the battery cell storage device 15, and a fourth valve 18 is provided between the second negative pressure chamber 17 and the second liquid injection device 19. The third valve 16 is used to control the flow of electrolyte between the second negative pressure chamber 17 and the battery cell storage device 15, and the fourth valve 18 is used to control the flow between the second negative pressure chamber 17 and the second liquid injection device 19.
[0047] In some embodiments, the pressure difference between the first negative pressure chamber 13 and the second negative pressure chamber 17 can be repeatedly controlled so that the first negative pressure chamber 13 can obtain a higher pressure relative to the second negative pressure chamber 17 and then be adjusted to a lower pressure, or the first negative pressure chamber 13 can obtain a lower pressure relative to the second negative pressure chamber 17 and then be adjusted to a higher pressure, thereby causing the vaporized electrolyte to circulate back and forth to infiltrate the battery cells 200 placed in the battery cell storage device 15. This is beneficial for enhancing the infiltration effect on the battery cells 200 and shortening the infiltration time of the electrolyte.
[0048] For example, refer to Figure 2 , set the first negative pressure chamber 13 and the second negative pressure chamber 17 to have negative pressure conditions that can vaporize the electrolyte, open the first valve 12, and close the second valve 14, the third valve 16 and the fourth valve 18 at the same time, inject the electrolyte in the first liquid injection device 11 into the first negative pressure chamber 13, close the first valve 12, use the negative pressure condition in the first negative pressure chamber 13 to vaporize the electrolyte to obtain vaporized electrolyte, and adjust the pressure in the first negative pressure chamber 13 to be higher than the pressure in the second negative pressure chamber 17, and then open the second valve 14 and the third valve 16 to make the first negative pressure chamber 13, the battery storage device 15, and the second negative pressure chamber 17 17 is connected, and the pressure difference formed by the first negative pressure chamber 13 and the second negative pressure chamber 17 is used to cause the vaporized electrolyte to flow from the first negative pressure chamber 13 into the battery cell storage device 15, and enter the battery cell 200 from the first liquid injection port 210 of the battery cell 200 to pre-wet the battery cell 200, and the excess vaporized electrolyte flows out from the second liquid injection port 220 of the battery cell 200 and enters the second negative pressure chamber 17. At this time, the pressure of the first negative pressure chamber 13 is adjusted to be lower than the pressure in the second negative pressure chamber 17, so that the vaporized electrolyte flows in the opposite direction to pre-wet the battery cell 200, and the excess vaporized electrolyte flows back to the first negative pressure chamber 13. In this way, the pressure of the first negative pressure chamber 13 and the second negative pressure chamber is repeatedly adjusted to form a pressure difference, which causes the vaporized electrolyte to circulate back and forth through the battery cell storage device 15 to pre-wet the battery cell 200. In this embodiment, the low-pressure infiltration module 10 sets negative pressure chambers at both ends of the battery storage device 15, and repeatedly controls the pressure difference between the negative pressure chambers at both ends, so that the electrolyte circulates back and forth to infiltrate the battery, which not only simplifies the infiltration process and saves resources, but also helps to improve the infiltration effect of the battery and shorten the infiltration time. In other implementations, the electrolyte can also be supplemented by controlling the fourth valve 18 and the second valve 14 to strengthen the infiltration of the battery cell 200.
[0049] In some embodiments, reference Figure 3 The first liquid injection port 210 and the second liquid injection port 220 of the battery cell 200 are arranged diagonally, which is conducive to promoting the flow of the electrolyte in the battery cell and enhancing the all-round infiltration of the battery cell.
[0050] The utility model also provides a battery manufacturing device, which includes the electrolyte infiltration system as described above and at least includes all the beneficial effects of the electrolyte infiltration system as described above.
[0051] In some embodiments, the battery manufacturing apparatus further comprises:
[0052] A baking module, used for baking batteries;
[0053] An aging module, used for aging the battery after electrolyte infiltration;
[0054] The formation module is used to form the aged batteries.
[0055] In this embodiment, the baking module, the low-pressure infiltration module, the aging module and the formation module are connected in sequence through pipelines. The above baking module, the low-pressure infiltration module, the aging module and the formation module can all work independently.
[0056] In some implementations, after the battery cell 200 is soaked in the electrolyte, the battery cell 200 may be left to stand for more than 1 hour, and then the battery cell 200 may be aged in the aging module.
[0057] The pre-impregnated liquid-filled battery cell has a better wetting effect and can effectively shorten the aging time. In some embodiments, the aging time is 1h to 12h, which can be 1h, 2h, 3h, 4h, 5h, 6h, 7h, 8h, 9h, 10h, 11h, 12h, etc.
[0058] The above description is only an optional embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.
Claims
1. An electrolyte infiltration system, characterized in that: The electrolyte infiltration system includes a low-pressure infiltration module for infiltrating the battery with electrolyte; The low-pressure infiltration module includes a first liquid injection device, a first negative pressure chamber and a battery cell storage device, the first liquid injection device is connected to the first negative pressure chamber, the battery cell storage device is used to provide battery cells, and the first negative pressure chamber is connected to the first liquid injection port of the battery cell.
2. The electrolyte infiltration system according to claim 1, characterized in that: A first valve is provided between the first liquid injection device and the first negative pressure chamber, and a second valve is provided between the first negative pressure chamber and the battery cell storage device.
3. The electrolyte infiltration system according to claim 1, characterized in that: When the low-pressure infiltration module is in operation, the pressure range of the first negative pressure chamber is -50 KPa to -90 KPa.
4. The electrolyte infiltration system according to any one of claims 1 to 3, characterized in that: The low-pressure infiltration module also includes a second negative pressure chamber and a second liquid injection device, one end of the second negative pressure chamber is connected to the second liquid injection port of the battery cell, and the other end of the second negative pressure chamber is connected to the second liquid injection device.
5. The electrolyte infiltration system according to claim 4, characterized in that: When the low-pressure infiltration module is in operation, the pressure range of the second negative pressure chamber is -50 KPa to -90 KPa.
6. The electrolyte infiltration system according to claim 4, characterized in that: When the low-pressure infiltration module is in operation, a pressure difference is formed between the first negative pressure chamber and the second negative pressure chamber.
7. The electrolyte infiltration system according to claim 6, characterized in that: The pressure difference between the first negative pressure chamber and the second negative pressure chamber is ≥10KPa.
8. The electrolyte infiltration system according to claim 4, characterized in that: A third valve is provided between the second negative pressure chamber and the battery cell storage device, and a fourth valve is provided between the second negative pressure chamber and the second liquid injection device.
9. The electrolyte infiltration system according to claim 4, characterized in that: The first liquid injection port and the second liquid injection port of the battery cell are arranged diagonally.
10. A battery manufacturing device, characterized in that: The battery manufacturing device comprises the electrolyte infiltration system according to any one of claims 1 to 9.