High-capacity battery electrolyte echelon utilization and purification system

Abstract

The utility model relates to a high-capacity battery electrolyte echelon utilization and purification system which comprises a high-capacity battery, a liquid storage container, a liquid injection pipe, a liquid extraction pipe, a liquid injection pump, a liquid extraction pump and at least two multi-stage filtering devices, the multi-stage filtering devices are connected to the liquid extraction pipe in parallel through a one-to-multi connector, and a sealing sleeve is arranged on the one-to-multi connector; a liquid separation block is arranged in the sealing sleeve, and a liquid separation opening is formed in the liquid separation block; when the liquid separation block retracts into the sealing sleeve, the liquid separation block seals the joint, close to the sealing sleeve, of the multi-head end of the one-to-multi joint; when the liquid separation block extends out of the sealing sleeve, the liquid separation block seals the connector, away from the sealing sleeve, of the multi-head end of the one-to-multi connector, and a liquid separation opening in the liquid separation block is communicated with the connector, close to the sealing sleeve, of the one-to-multi connector. By controlling the telescopic position of the liquid separation block in the sealing sleeve, different multi-stage filtering devices can be selected to filter the electrolyte, and the problem that the stability of the battery formation process is affected when the multi-stage filtering devices are cleaned is effectively solved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a system for the cascade utilization and purification of electrolyte in large-capacity batteries. Background Technology

[0002] In lithium battery production, electrolyte injection and formation are critical processes. However, current electrolyte injection systems generally suffer from problems such as long injection times, high equipment requirements, inability to promptly remove electrolyte impurities and moisture, and electrolyte loss within the system pipelines, leading to persistently high production costs. These issues manifest in battery performance as poor cycle performance, low capacity, and increased short-circuit rate. Furthermore, the industry primarily uses open-cell formation for battery formation, which requires the timely removal of gases generated by side reactions. Removing these gases carries away electrolyte, altering electrolyte concentration and resulting in waste.

[0003] A Chinese patent application (CN202020591352.X) discloses a system for the cascade utilization and purification of electrolyte in large-capacity batteries. Each large-capacity lithium-ion battery is equipped with an injection port and an extraction port for precise electrolyte injection and extraction of excess electrolyte. The extraction port also allows for the timely discharge of gases generated during formation, improving the formation effect and increasing battery cycle performance. Batteries can be placed and formed at the injection station, reducing equipment space requirements. The extraction port is connected to an extraction branch pipe via a one-way extraction valve. The extraction branch pipe is interconnected with the extraction main pipe, which is connected to the inlet of a storage container via a extraction pump. Excess electrolyte can flow back to the storage container through the extraction pipe, achieving electrolyte recycling. A multi-stage filtration device is installed near the extraction pump in the extraction main pipe to filter and recover impurities and remove moisture from the electrolyte.

[0004] The aforementioned technologies have the following drawbacks: excessive accumulation of impurities within the multi-stage filtration device can lead to clogging. This necessitates increasing the power of the liquid pump to maintain flow, resulting in higher power consumption. Prolonged high-power operation can also damage the pump body. Therefore, timely cleaning of the multi-stage filtration device is required. However, cleaning necessitates suspending the operation of both the liquid pump and the injection pump, which interrupts electrolyte circulation and affects the stability of the battery formation process. Utility Model Content

[0005] To address the issue that cleaning multi-stage filtration devices can disrupt electrolyte circulation and affect the stability of the battery formation process, this application provides a high-capacity battery electrolyte cascade utilization and purification system.

[0006] The high-capacity battery electrolyte cascade utilization and purification system provided in this application adopts the following technical solution:

[0007] A system for the cascade utilization and purification of electrolyte in a large-capacity battery includes a large-capacity battery with an injection port and an extraction port, and a storage container. An injection pipe connects the injection port of the large-capacity battery to the storage container, and an extraction pipe connects the extraction port of the large-capacity battery to the storage container. An injection pump is mounted on the injection pipe, and an extraction pump is mounted on the extraction pipe. At least two multi-stage filtration devices are mounted on the extraction pipe near the extraction pump. The multi-stage filtration devices are connected in parallel to the extraction pipe via a multi-connector. A sealing sleeve is mounted on the multi-connector between the large-capacity battery and the multi-stage filtration devices. The open end of the sealing sleeve communicates with the multi-connector. A liquid distribution block is slidably disposed inside the sealing sleeve, and a liquid distribution port is opened at one end of the liquid distribution block near the sealing sleeve.

[0008] When the liquid distribution block retracts into the sealing sleeve, the liquid distribution block closes the connector of the multi-head end of the one-to-many connector that is close to the sealing sleeve; when the liquid distribution block extends out of the sealing sleeve, the liquid distribution block closes the connector of the multi-head end of the one-to-many connector that is away from the sealing sleeve, and the liquid distribution port on the liquid distribution block is connected to the connector of the one-to-many connector that is close to the sealing sleeve.

[0009] Furthermore, the multi-connector is provided with a linear drive component that drives the liquid distribution block to slide within the sealing sleeve, and a control component for controlling the opening of the linear drive component is provided near the multi-connector on the liquid extraction tube.

[0010] Furthermore, the control component includes a mounting cylinder, the liquid extraction tube has a mounting hole, the mounting cylinder is disposed on the liquid extraction tube corresponding to the mounting hole, the inner diameter of the mounting cylinder is larger than the diameter of the mounting hole, and a sealing block for sealing the mounting hole is slidably disposed inside the mounting cylinder;

[0011] A cap is detachably mounted on the end of the mounting cylinder away from the mounting hole. An elastic element is provided between the sealing block and the cap to drive the sealing block to block the mounting hole. A micro switch is provided on the end of the cap facing the sealing block to control the opening of the linear drive to drive the liquid dispensing block out of the sealing sleeve. When the pressure in the liquid extraction tube rises and exceeds a set value, the sealing block moves away from the mounting hole and triggers the micro switch.

[0012] Furthermore, the cap is provided with a reset switch for controlling the linear drive to open and cause the liquid distribution block to retract into the sealing sleeve.

[0013] Furthermore, a sealing groove is provided inside the multi-connector corresponding to the lower end of the liquid distribution block, allowing the liquid distribution block to be embedded.

[0014] Furthermore, a sealing gasket is provided inside the sealing groove.

[0015] Furthermore, a guide post is fixed to one side of the liquid distribution block and is arranged along its length, and a guide groove is opened in the multi-converter corresponding to the guide post.

[0016] In summary, the beneficial technical effects of this application are as follows:

[0017] When a large-capacity battery needs electrolyte, the injection pump is started. The injection pump injects the electrolyte from the storage container into the injection port of the large-capacity battery through the injection tube. The electrolyte enters the battery and provides the necessary ion conduction environment for the battery.

[0018] When there is excess electrolyte in the large-capacity battery or when it needs to be replaced, the pump is activated. The pump draws excess electrolyte from the battery's outlet through a suction pipe and feeds it to a multi-stage filtration system for step-by-step filtration, removing impurities and moisture. The filtered electrolyte then flows into a storage container. During this process, a combination design of a multi-connector, a sealing sleeve, and a distributor block allows for switching between the multi-stage filtration systems. By controlling the extension and retraction position of the distributor block within the sealing sleeve, the electrolyte flow path can be altered, allowing different multi-stage filtration systems to be selected. This design allows for flexible switching of filtration devices according to actual needs, improving filtration efficiency and extending equipment lifespan. For example, when one filtration device needs cleaning or filter replacement, the position of the distributor block can be switched to use another filtration device to continue filtration, ensuring continuous system operation. This effectively addresses the problem of electrolyte circulation interruption during multi-stage filtration, which affects the stability of the battery formation process. Attached Figure Description

[0019] Figure 1 This is a system device diagram according to an embodiment of this application;

[0020] Figure 2 This is a structural schematic diagram of the mounting cylinder, multi-connector, sealing sleeve, and linear drive component according to an embodiment of this application;

[0021] Figure 3 This is a top view of the structure of the mounting cylinder, multi-connector, sealing sleeve, and linear drive component in the application embodiment;

[0022] Figure 4 It is along Figure 3 Schematic diagram of the cross-sectional structure along line AA.

[0023] Explanation of reference numerals in the attached diagram: 1. High-capacity battery; 11. Injection tube; 111. Injection pump; 12. Extraction tube; 121. Extraction pump; 122. Mounting hole; 2. Liquid storage container; 3. One-to-many connector; 31. Linear drive component; 32. Guide groove; 33. Sealing groove; 331. Sealing gasket; 4. Sealing sleeve; 41. Liquid distribution block; 411. Liquid distribution port; 412. Guide column; 5. Multi-stage filtration device; 6. Mounting cylinder; 61. Sealing block; 62. Elastic component; 63. Cap; 64. Micro switch; 65. Reset switch. Detailed Implementation

[0024] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] This application discloses a system for the cascade utilization and purification of electrolyte in a high-capacity battery. (Refer to...) Figures 1 to 4 A system for the cascade utilization and purification of electrolyte in a large-capacity battery 1 includes a large-capacity battery 1 with an injection port and an extraction port, and a storage container 2. An injection pipe 11 is connected between the injection port of the large-capacity battery 1 and the storage container 2, and an extraction pipe 12 is provided between the extraction port of the large-capacity battery 1 and the storage container 2. An injection pump 111 is provided on the injection pipe 11, and an extraction pump 121 is provided on the extraction pipe 12. At least two multi-stage filtration devices 5 are provided on the extraction pipe 12 near the extraction pump 121. The multi-stage filtration devices 5 are connected in parallel to the extraction pipe 12 via a multi-connector 3. A sealing sleeve 4 is provided on the multi-connector 3 between the large-capacity battery 1 and the multi-stage filtration devices 5. The open end of the sealing sleeve 4 is connected to the multi-connector 3. The design of the sealing sleeve 4 ensures the sealing between the components of the system and prevents electrolyte leakage. A liquid distribution block 41 is slidably provided inside the sealing sleeve 4. A liquid distribution port 411 is opened at one end of the liquid distribution block 41 near the sealing sleeve 4.

[0026] When the liquid separator 41 retracts into the sealing sleeve 4, the liquid separator 41 closes the connector of the multi-head end of the multi-turn connector 3 that is close to the sealing sleeve 4; when the liquid separator 41 extends out of the sealing sleeve 4, the liquid separator 41 closes the connector of the multi-head end of the multi-turn connector 3 that is away from the sealing sleeve 4, and the liquid separator port 411 on the liquid separator 41 is connected to the connector of the multi-turn connector 3 that is close to the sealing sleeve 4.

[0027] In this way, when the large-capacity battery 1 needs electrolyte, the injection pump 111 is started. The injection pump 111 injects the electrolyte in the storage container 2 into the injection port of the large-capacity battery 1 through the injection pipe 11. The electrolyte enters the battery and provides the necessary ion conduction environment for the battery.

[0028] When the electrolyte in the large-capacity battery 1 is abundant or needs to be replaced, the pump 121 is activated. The pump 121 draws excess electrolyte from the outlet of the large-capacity battery 1 through the suction pipe 12 to the multi-stage filtration device 5 for step-by-step filtration, removing impurities and moisture. The filtered electrolyte then flows into the storage container 2. During this process, the combination design of the multi-connector 3, sealing sleeve 4, and distributor 41 allows for the switching of the multi-stage filtration device 5. By controlling the extension and retraction position of the distributor 41 within the sealing sleeve 4, the flow path of the electrolyte can be changed, thus allowing different multi-stage filtration devices 5 to be selected for filtration. This design allows for flexible switching of filtration devices according to actual needs, improving filtration efficiency and extending equipment lifespan. For example, when one multi-stage filtration device 5 needs cleaning or filter replacement, the position of the distributor 41 can be switched to use another multi-stage filtration device 5 to continue filtration, ensuring continuous system operation. This effectively addresses the problem of electrolyte circulation interruption during cleaning of the multi-stage filtration device 5, which affects the stability of the battery formation process.

[0029] Specifically, refer to Figure 1 and Figure 2 The multi-connector 3 is provided with a linear drive 31 that drives the liquid distribution block 41 to slide inside the sealing sleeve 4. The linear drive 31 can be a cylinder or a hydraulic cylinder. The liquid extraction pipe 12 is provided with a control component for controlling the opening of the linear drive 31 near the multi-connector 3.

[0030] Furthermore, referring to Figures 2 to 4 The control component includes a mounting cylinder 6, a mounting hole 122 is provided on the liquid extraction tube 12, the mounting cylinder 6 is set on the liquid extraction tube 12 at the corresponding mounting hole 122, the inner diameter of the mounting cylinder 6 is larger than the diameter of the mounting hole 122, and a sealing block 61 for sealing the mounting hole 122 is slidably provided inside the mounting cylinder 6.

[0031] A cap 63 is detachably installed on one end of the mounting cylinder 6 away from the mounting hole 122. An elastic element 62, specifically a spring, is provided between the sealing block 61 and the cap 63 to drive the sealing block 61 to block the mounting hole 122. A micro switch 64 is provided on the end of the cap 63 facing the sealing block 61 to control the opening of the linear drive 31 to drive the liquid dispensing block 41 to extend out of the sealing sleeve 4. When the pressure in the liquid extraction tube 12 rises and exceeds the set value, the sealing block 61 moves away from the mounting hole 122 and triggers the micro switch 64.

[0032] Thus, when the pressure inside the suction pipe 12 is within the set range, the elastic element 62 drives the sealing block 61 to seal the mounting hole 122, and the liquid distribution block 41 seals the connector of the multi-head end of the multi-connector 3 near the sealing sleeve 4. At this time, the electrolyte flows out through the connector of the multi-head end of the multi-connector 3 away from the sealing sleeve 4 and enters the corresponding multi-stage filtration device 5 for filtration to remove impurities and moisture. The filtered electrolyte then flows into the storage container 2.

[0033] When the pressure inside the extraction tube 12 rises and exceeds the set value, the elastic element 62 is compressed, the sealing block 61 moves away from the mounting hole 122, and triggers the micro switch 64. After the micro switch 64 is triggered, it controls the linear drive 31 to open, driving the liquid distribution block 41 to extend out of the sealing sleeve 4. The liquid distribution block 41 closes the connectors of the multi-head connector 3 that are away from the sealing sleeve 4. Since the liquid distribution port 411 on the liquid distribution block 41 is connected to the connector of the multi-head connector 3 near the sealing sleeve 4, the electrolyte flows through the liquid distribution port 411 on the liquid distribution block 41 into the corresponding multi-stage filtration device 5 for filtration, removing impurities and moisture. The filtered electrolyte then flows into the storage container 2. Through the coordinated operation of components such as the sealing block 61, elastic element 62, and micro switch 64 in the control assembly, the linear drive 31 is automatically triggered according to the pressure change inside the extraction tube 12, effectively realizing the automatic operation of the liquid distribution block 41 and the automatic control of the electrolyte flow direction.

[0034] Furthermore, referring to Figure 2 The cap 63 is equipped with a reset switch 65 for controlling the linear drive 31 to open and drive the liquid distribution block 41 to retract the sealing sleeve 4. In this way, after the clogged multi-stage filter device 5 is cleaned, the reset switch 65 can be operated to control the linear drive 31 to open and drive the liquid distribution block 41 to retract the sealing sleeve 4, restoring it to the initial state.

[0035] Furthermore, referring to Figure 3 and Figure 4 A sealing groove 33 is provided at the lower end of the liquid distribution block 41 inside the multi-connector 3, which allows the liquid distribution block 41 to be embedded. The design of the sealing groove 33 allows the liquid distribution block 41 to be tightly embedded in the multi-connector 3 when it is extended, forming a more reliable sealing connection. In addition, the sealing groove 33 plays a role in positioning and supporting the liquid distribution block 41, improving the stability of the liquid distribution block 41 in the extended state.

[0036] At the same time, refer to Figure 3 and Figure 4 A sealing gasket 331 is provided inside the sealing groove 33. The sealing gasket 331 is made of a material with good elasticity and corrosion resistance. While further enhancing the sealing performance, it can also reduce the direct contact between the liquid distribution block 41 and the sealing groove 33 and reduce wear.

[0037] Additionally, refer to Figure 3 and Figure 4A guide post 412 is fixed to one side of the liquid distribution block 41 along its length direction. A guide groove 32 is provided in the multi-connector 3 corresponding to the guide post 412. The design of the guide post 412 and the guide groove 32 allows the liquid distribution block 41 to slide along a fixed path during the extension and retraction process, which further enhances the stability of the system. At the same time, it also helps the liquid distribution block 41 to accurately embed and detach from the sealing groove 33, thus improving the accuracy of the system.

[0038] The implementation principle of a high-capacity battery electrolyte cascade utilization and purification system according to an embodiment of this application is as follows:

[0039] When the large-capacity battery 1 needs electrolyte, the injection pump 111 is started. The injection pump 111 injects the electrolyte in the storage container 2 into the injection port of the large-capacity battery 1 through the injection pipe 11. The electrolyte enters the battery and provides the necessary ion conduction environment for the battery.

[0040] When the electrolyte in the large-capacity battery 1 is abundant or needs to be replaced, the pump 121 is activated. The pump 121 draws excess electrolyte from the outlet of the large-capacity battery 1 through the suction pipe 12 to the multi-stage filtration device 5 for step-by-step filtration, removing impurities and moisture. The filtered electrolyte then flows into the storage container 2. During this process, the multi-stage filtration device 5 can be switched using a combination design of a multi-connector 3, a sealing sleeve 4, and a distributor block 41. By controlling the extension and retraction position of the distributor block 41 within the sealing sleeve 4, the flow path of the electrolyte can be changed, allowing different multi-stage filtration devices 5 to be selected for filtration. This design allows for flexible switching of filtration devices according to actual needs, improving filtration efficiency and extending the equipment's lifespan. For example, when one multi-stage filtration device 5 needs cleaning or filter replacement, the position of the distributor block 41 can be switched to use another multi-stage filtration device 5 to continue filtration, ensuring continuous system operation. This effectively improves the problem that cleaning the multi-stage filtration device 5 would cause the electrolyte circulation to be interrupted, affecting the stability of the battery formation process.

[0041] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "an" or "a" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" and similar terms mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0042] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A large-capacity battery (1) electrolyte step-by-step utilization and purification system, comprising a large-capacity battery (1) provided with a liquid injection port and a liquid extraction port and a liquid storage container (2), a liquid injection pipe (11) being connected between the liquid injection port of the large-capacity battery (1) and the liquid storage container (2), a liquid extraction pipe (12) being provided between the liquid extraction port of the large-capacity battery (1) and the liquid storage container (2), a liquid injection pump (111) being provided on the liquid injection pipe (11), and a liquid extraction pump (121) being provided on the liquid extraction pipe (12); characterized in that, The liquid suction pipe (12) is provided with at least two multi-stage filtering devices (5) near the position of the liquid suction pump (121), the multi-stage filtering devices (5) are connected in parallel on the liquid suction pipe (12) through a multi-way joint (3), a sealing sleeve (4) is arranged on the multi-way joint (3) between the large-capacity battery (1) and the multi-stage filtering devices (5), the opening end of the sealing sleeve (4) is communicated with the multi-way joint (3), and a liquid distribution block (41) is slidably arranged in the sealing sleeve (4); a liquid distribution opening (411) is formed in one end of the liquid distribution block (41) close to the sealing sleeve (4). When the liquid distribution block (41) is retracted into the sealing sleeve (4), the liquid distribution block (41) closes the joint of the multi-way joint (3) close to the sealing sleeve (4); when the liquid distribution block (41) is extended out of the sealing sleeve (4), the liquid distribution block (41) closes the joint of the multi-way joint (3) away from the sealing sleeve (4), and the liquid distribution opening (411) on the liquid distribution block (41) is communicated with the joint of the multi-way joint (3) close to the sealing sleeve (4).

2. The large capacity battery (1) electrolyte stepwise utilization and purification system according to claim 1, characterized in that, A linear driving element (31) for driving the liquid distribution block (41) to slide in the sealing sleeve (4) is arranged on the multi-way joint (3), and a control assembly for controlling the linear driving element (31) to be turned on is arranged on the liquid suction pipe (12) near the position of the multi-way joint (3).

3. The large capacity battery (1) electrolyte stepwise utilization and purification system according to claim 2, characterized in that, The control assembly comprises a mounting cylinder (6), a mounting hole (122) is formed in the liquid suction pipe (12), the mounting cylinder (6) is arranged on the liquid suction pipe (12) at a position corresponding to the mounting hole (122), the inner diameter of the mounting cylinder (6) is greater than the diameter of the mounting hole (122), and a sealing block (61) for closing the mounting hole (122) is slidably arranged in the mounting cylinder (6). A cap (63) is detachably mounted on one end of the mounting cylinder (6) away from the mounting hole (122), an elastic element (62) for driving the sealing block (61) to block the mounting hole (122) is arranged between the sealing block (61) and the cap (63), a micro switch (64) for controlling the linear driving element (31) to be turned on to drive the liquid distribution block (41) to extend out of the sealing sleeve (4) is arranged on one end of the cap (63) facing the sealing block (61), and when the pressure in the liquid suction pipe (12) rises and exceeds a set value, the sealing block (61) moves away from the mounting hole (122) and triggers the micro switch (64).

4. The large capacity battery (1) electrolyte stepwise utilization and purification system according to claim 3, characterized in that, A reset switch (65) for controlling the linear driving element (31) to be turned on to drive the liquid distribution block (41) to retract into the sealing sleeve (4) is arranged on the cap (63).

5. The large capacity battery (1) electrolyte stepwise utilization and purification system according to claim 1, characterized in that, A sealing groove (33) for embedding the liquid distribution block (41) is formed in the multi-way joint (3) at a position corresponding to the lower end of the liquid distribution block (41).

6. The large capacity battery (1) electrolyte stepwise utilization and purification system according to claim 5, characterized in that, A sealing gasket (331) is arranged in the sealing groove (33).

7. The large capacity battery (1) electrolyte stepwise utilization and purification system according to claim 1, characterized in that, One side of the liquid distribution block (41) is fixedly connected with a guide column (412) arranged along the length direction, and a guide groove (32) is arranged in the one-to-many joint (3) corresponding to the guide column (412).

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