Bare cell infiltration device for lithium ion battery
By designing a bare cell wetting device for lithium-ion batteries, and utilizing a circulating wetting mechanism and a wetting control mechanism, rapid and uniform wetting of electrolyte inside the cell is achieved, solving the problem of slow natural diffusion wetting speed of electrolyte and improving battery performance and production efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-26
- Publication Date
- 2026-03-13
AI Technical Summary
In current lithium-ion battery production, the natural diffusion and wetting rate of the electrolyte is slow, resulting in uneven wetting and affecting battery performance stability and production efficiency.
A bare cell immersion device for lithium-ion batteries is adopted, including a cell immersion chamber, a circulating immersion mechanism, and an immersion control mechanism. By dynamically contacting the cell and the immersion chamber with circulating electrolyte, combined with detection and flow regulation, rapid and uniform immersion is achieved.
This improves the diffusion kinetic energy of the electrolyte inside the cell, shortens the immersion time, and ensures the stability of battery performance and production efficiency.
Smart Images
Figure CN223993391U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of new energy battery technology, and in particular to a bare battery for lithium-ion batteries.
[0002] Core immersion device. Background Technology
[0003] Lithium-ion batteries are a common type of rechargeable battery, widely used in various electronic devices due to their high energy density, long lifespan, and good charge-discharge performance. The performance of a lithium-ion battery is determined by the properties of its internal components. Among them, the electrolyte, as an important medium for lithium-ion transport, has a significant impact on the interfacial impedance of lithium-ion transport and the final electrical performance of the cell due to its contact and wetting state with the main components of the battery cell, such as the positive electrode, negative electrode, and separator.
[0004] Due to factors such as the size of various structures within the battery cell, pore tortuosity, surface tension, and material wettability, the electrolyte wetting of the cell after injection typically requires a lengthy diffusion process. When wettability is poor, the unwetted areas of the cell will have limited charging and discharging capabilities, ultimately leading to problems such as low capacity or even lithium plating and short circuits. Therefore, improving the electrolyte wettability is one of the key focuses in lithium-ion battery manufacturing.
[0005] In existing technologies, the electrolyte is typically injected into the battery, and then allowed to naturally diffuse and wet the main components of the battery over a long period of time. However, this natural diffusion method is slow and requires a long time, which significantly impacts production efficiency. Furthermore, it can lead to uneven wetting of the battery cells, affecting the stability of battery performance. Utility Model Content
[0006] The purpose of this invention is to address the shortcomings of the prior art by providing a bare cell impregnation device for lithium-ion batteries. This device can increase the speed of electrolyte impregnation of the cell and make the impregnation more uniform, thereby improving production efficiency and ensuring the stability of battery performance.
[0007] This utility model proposes a bare cell immersion device for lithium-ion batteries, including a cell immersion chamber, a circulating immersion mechanism, and an immersion control mechanism. The cell immersion chamber contains the bare cell for immersion in electrolyte. The circulating immersion mechanism is connected to the cell immersion chamber and is used to deliver electrolyte to the cell immersion chamber and to recycle electrolyte in the cell immersion chamber. The immersion control mechanism is connected to the cell immersion chamber and the circulating immersion mechanism and is used to control the starting or stopping of the circulating immersion mechanism.
[0008] Furthermore, the circulating wetting mechanism includes an electrolyte buffer tank for storing electrolyte, an inlet pipe connecting the electrolyte buffer tank to the cell wetting chamber, and an outlet pipe connecting the electrolyte buffer tank to the cell wetting chamber.
[0009] Furthermore, one end of the inlet pipe is connected to the electrolyte buffer tank and the other end is connected to the top of the cell wetting chamber, and one end of the outlet pipe is connected to the electrolyte buffer tank and the other end is connected to the bottom of the cell wetting chamber.
[0010] Furthermore, one end of the inlet pipe that is connected to the electrolyte buffer tank extends to the bottom of the electrolyte buffer tank, and the other end of the outlet pipe that is connected to the electrolyte buffer tank extends to the top of the electrolyte buffer tank.
[0011] Furthermore, the circulating wetting mechanism also includes a delivery pump on the inlet pipe and a return pump on the outlet pipe. The delivery pump drives the electrolyte to flow from the electrolyte buffer tank to the cell wetting chamber, and the return pump drives the electrolyte to flow back from the cell wetting chamber to the electrolyte buffer tank.
[0012] Furthermore, the circulating immersion mechanism also includes a first solenoid valve disposed on the inlet pipe and a second solenoid valve disposed on the outlet pipe, wherein the first solenoid valve controls the opening or closing of the inlet pipe and the second solenoid valve controls the opening or closing of the outlet pipe.
[0013] Furthermore, the circulating wetting mechanism also includes a first filter disposed on the inlet pipe and a second filter disposed on the outlet pipe. The first filter is used to filter the electrolyte delivered from the electrolyte buffer tank to the cell wetting chamber, and the second filter is used to filter the electrolyte returned from the cell wetting chamber to the electrolyte buffer tank.
[0014] Furthermore, the immersion control mechanism includes a detection device and a switching device, wherein the detection device is electrically connected to the bare battery cell, and the switching device is electrically connected to the cyclic immersion mechanism.
[0015] Furthermore, the testing device includes a digital voltmeter connected to the tabs of the bare cell, and a battery internal resistance tester connected to the tabs of the bare cell.
[0016] Furthermore, the immersion control mechanism also includes a flow regulating device disposed in the circulating immersion mechanism.
[0017] The bare cell impregnation device for lithium-ion batteries proposed in this utility model has the following beneficial effects:
[0018] (1) The electrolyte of this immersion device circulates between the cell immersion chamber and the circulating immersion mechanism, making the contact between the electrolyte and the internal structure of the bare cell a dynamic process. This can increase the diffusion kinetic energy of the electrolyte, improve the immersion speed of the bare cell, and make the electrolyte and the internal structure of the bare cell in uniform contact, thereby reducing the immersion time cost, improving production efficiency, and ensuring the stability of battery performance.
[0019] (2) This immersion device controls the start and stop of the circulating immersion mechanism through the immersion control mechanism, so that the electrolyte circulation stops after the bare cell reaches the preset immersion effect, thereby further improving the uniformity of the bare cell immersion and ensuring the stability of battery performance.
[0020] (3) One end of the liquid inlet pipe of this immersion device is connected to the electrolyte buffer tank, and the other end is connected to the top of the cell immersion chamber. One end of the liquid outlet pipe is connected to the electrolyte buffer tank, and the other end is connected to the bottom of the cell immersion chamber. This allows the electrolyte to better contact the internal structure of the bare cell during the process of flowing through the cell immersion chamber, further improving the uniformity of the bare cell immersion and ensuring the stability of the battery performance.
[0021] (4) The circulating wetting mechanism of this wetting device also includes a delivery pump and a return pump. The delivery pump drives the electrolyte in the electrolyte buffer tank to be delivered to the cell wetting chamber through the inlet pipe. The return pump drives the electrolyte in the cell wetting chamber to flow back to the electrolyte buffer tank through the outlet pipe. This realizes the circulation of electrolyte between the cell wetting chamber and the circulating wetting mechanism, which not only improves the wetting speed of the bare cell, but also makes the electrolyte contact the internal structure of the bare cell evenly.
[0022] (5) The circulating wetting mechanism of this wetting device also includes a first filter and a second filter. The first filter filters the electrolyte flowing through the inlet pipe and the second filter filters the electrolyte flowing through the outlet pipe, thereby preventing the electrolyte with impurities in the cell wetting chamber from flowing back to the electrolyte buffer tank, thus ensuring the wetting effect of the electrolyte on the electrolyte and ensuring the performance of the battery.
[0023] (6) The detection device of this immersion device includes a digital voltmeter connected to the tab of the bare cell and a battery internal resistance tester connected to the tab of the bare cell. The voltage of the bare cell is detected by connecting the digital voltmeter to the tab of the bare cell; the internal resistance of the bare cell is detected by connecting the battery internal resistance tester to the tab of the bare cell. Based on whether the voltage and internal resistance of the bare cell reach the preset values, it is determined whether the immersion of the bare cell meets the preset requirements.
[0024] (7) The wetting control mechanism of this wetting device also includes a flow regulating device in the circulating wetting mechanism. The flow regulating device measures and regulates the flow rate of the electrolyte in the circulating wetting mechanism, so that the electrolyte circulates in the circulating wetting mechanism and the cell wetting chamber at a preset flow rate. This not only increases the wetting speed of the bare cell, but also makes the electrolyte and the internal structure of the bare cell come into uniform contact, thereby improving production efficiency and ensuring the stability of battery performance. Attached Figure Description
[0025] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention. In these drawings, similar reference numerals are used to denote similar elements.
[0026] Figure 1 This is a schematic diagram of the circulating wetting mechanism of a bare cell wetting device for lithium-ion batteries according to an embodiment of the present invention;
[0027] Figure 2 This is a schematic diagram of a bare cell impregnation device for lithium-ion batteries according to an embodiment of the present invention, which impregnates a bare cell.
[0028] Figure 3 This is a schematic diagram showing the connection between the wetting control mechanism and the bare cell in a bare cell wetting device for lithium-ion batteries, according to an embodiment of this utility model.
[0029] In the diagram: 1. Cell wetting chamber; 2. Circulating wetting mechanism; 21. Electrolyte buffer tank; 22. Inlet pipe; 23. Outlet pipe; 24. Transfer pump; 25. Return pump; 26. First solenoid valve; 27. Second solenoid valve; 28. First filter; 29. Second filter; 3. Wetting control mechanism; 31. Detection device; 32. Switching device; 33. Flow regulating device; 4. Bare cell. Detailed Implementation
[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.
[0031] Please see Figures 1-3This utility model discloses a device for impregnating a bare lithium-ion battery cell 4, comprising a cell impregnation chamber 1, a circulating impregnation mechanism 2, and an impregnation control mechanism 3. The cell impregnation chamber 1 contains the bare battery cell 4 for impregnating it with electrolyte. The circulating impregnation mechanism 2 is connected to the cell impregnation chamber 1 and is used to deliver electrolyte to the cell impregnation chamber 1 and to recycle the electrolyte in the cell impregnation chamber 1. The impregnation control mechanism 3 is connected to the cell impregnation chamber 1 and the circulating impregnation mechanism 2 and is used to control the starting or stopping of the circulating impregnation mechanism 2.
[0032] In this application, the impregnation device includes a cell impregnation chamber 1 and a circulating impregnation mechanism 2. The cell impregnation chamber 1 is used to hold bare cells 4, and the circulating impregnation mechanism 2 is connected to the cell impregnation chamber 1. When impregnating lithium-ion batteries, the bare cells 4 are first placed in the cell impregnation chamber 1, and then electrolyte is supplied to the cell impregnation chamber 1 through the circulating impregnation mechanism 2, so that the electrolyte impregnates the bare cells 4 in the cell impregnation chamber 1, and then flows back to the circulating impregnation mechanism 2.
[0033] In this application, the impregnation device further includes an impregnation control mechanism 3, which is connected to the cell impregnation chamber 1 and the circulating impregnation mechanism 2. During the impregnation of the lithium-ion battery, the impregnation control mechanism 3 controls the starting of the circulating impregnation mechanism 2, causing the electrolyte to circulate between the cell impregnation chamber 1 and the circulating impregnation mechanism 2 until the bare cell 4 in the cell impregnation chamber 1 reaches the preset impregnation effect. Then, the impregnation control mechanism 3 controls the closing of the circulating impregnation mechanism 2, stopping the electrolyte circulation between the cell impregnation chamber 1 and the circulating impregnation mechanism 2, thereby completing the impregnation of the bare cell 4.
[0034] In this application, when the circulating wetting mechanism 2 is activated, the electrolyte circulates between the cell wetting chamber 1 and the circulating wetting mechanism 2, making the contact between the electrolyte and the internal structures of the bare cell 4 a dynamic process. This increases the diffusion kinetic energy of the electrolyte, improves the wetting speed of the bare cell 4, and ensures uniform contact between the electrolyte and the internal structures of the bare cell 4, thereby reducing the wetting time cost, improving production efficiency, and ensuring the stability of battery performance.
[0035] Meanwhile, the wetting control mechanism 3 controls the start and stop of the circulating wetting mechanism 2, so that the electrolyte circulation stops after the bare cell 4 reaches the preset wetting effect, thereby further improving the uniformity of the wetting of the bare cell 4 and ensuring the stability of battery performance.
[0036] In this embodiment, the circulating wetting mechanism 2 includes an electrolyte buffer tank 21 for storing electrolyte, an inlet pipe 22 connecting the electrolyte buffer tank 21 to the cell wetting chamber 1, and an outlet pipe 23 connecting the electrolyte buffer tank 21 to the cell wetting chamber 1. In this application, the circulating wetting mechanism 2 includes an electrolyte buffer tank 21, an inlet pipe 22, and an outlet pipe 23. The electrolyte buffer tank 21 is used to store electrolyte, and the inlet pipe 22 connects the electrolyte buffer tank 21 to the cell wetting chamber 1, thereby allowing the electrolyte in the electrolyte buffer tank 21 to be transported to the cell wetting chamber 1 through the inlet pipe 22.
[0037] The electrolyte delivered to the cell impregnation chamber 1 impregnates the bare cells 4 contained in the cell impregnation chamber 1, and then flows back to the electrolyte buffer tank 21 from the outlet pipe 23. Thus, the electrolyte circulates between the cell impregnation chamber 1 and the electrolyte buffer tank 21, making the contact between the electrolyte and the internal structure of the bare cells 4 a dynamic process. This increases the diffusion kinetic energy of the electrolyte, improves the impregnation speed of the bare cells 4, and ensures uniform contact between the electrolyte and the internal structure of the bare cells 4. This reduces the impregnation time cost, improves production efficiency, and ensures the stability of battery performance.
[0038] Specifically, in this embodiment, one end of the inlet pipe 22 is connected to the electrolyte buffer tank 21, and the other end is connected to the top of the cell wetting chamber 1. One end of the outlet pipe 23 is connected to the electrolyte buffer tank 21, and the other end is connected to the bottom of the cell wetting chamber 1. In this application, connecting one end of the inlet pipe 22 to the electrolyte buffer tank 21 and the other end to the top of the cell wetting chamber 1 allows the electrolyte transported by the inlet pipe 22 to enter the cell wetting chamber 1 from the top.
[0039] One end of the outlet pipe 23 is connected to the electrolyte buffer tank 21, and the other end is connected to the bottom of the cell wetting chamber 1. This allows the electrolyte delivered to the cell wetting chamber 1 to flow from the top to the bottom of the cell wetting chamber 1 and then back into the electrolyte buffer tank 21 through the outlet pipe 23. This allows the electrolyte to better contact the internal structures of the bare cell 4 during its flow through the cell wetting chamber 1, thereby further improving the uniformity of the bare cell 4's wetting and ensuring the stability of the battery performance.
[0040] Furthermore, in this embodiment, the end of the inlet pipe 22 connected to the electrolyte buffer tank 21 extends to the bottom of the electrolyte buffer tank 21, and the end of the outlet pipe 23 connected to the electrolyte buffer tank 21 extends to the top of the electrolyte buffer tank 21.
[0041] In this application, the end of the inlet pipe 22 connected to the electrolyte buffer tank 21 extends to the bottom of the electrolyte buffer tank 21, so that the electrolyte in the electrolyte buffer tank 21 can be better delivered to the cell wetting chamber 1 through the inlet pipe 22; the end of the outlet pipe 23 connected to the electrolyte buffer tank 21 extends to the top of the electrolyte buffer tank 21, so that the electrolyte in the cell wetting chamber 1 can be better returned to the electrolyte buffer tank 21 through the outlet pipe 23, thereby making the wetting device more practical.
[0042] In this embodiment, the circulating wetting mechanism 2 further includes a delivery pump 24 disposed on the inlet pipe 22 and a return pump 25 disposed on the outlet pipe 23. The delivery pump 24 drives the electrolyte from the electrolyte buffer tank 21 to the cell wetting chamber 1, and the return pump 25 drives the electrolyte from the cell wetting chamber 1 back to the electrolyte buffer tank 21. In this application, the circulating wetting mechanism 2 further includes a delivery pump 24 and a return pump 25, with the delivery pump 24 disposed on the inlet pipe 22 and the return pump 25 disposed on the outlet pipe 23.
[0043] The electrolyte in the electrolyte buffer tank 21 is driven to be transported to the cell impregnation chamber 1 through the inlet pipe 22 by the start of the delivery pump 24; the electrolyte in the cell impregnation chamber 1 is driven to be returned to the electrolyte buffer tank 21 through the outlet pipe 23 by the start of the return pump 25. This realizes the circulation of electrolyte between the cell impregnation chamber 1 and the circulating impregnation mechanism 2, making the contact between electrolyte and the internal structure of bare cell 4 a dynamic process. This can increase the diffusion kinetic energy of electrolyte, improve the impregnation speed of bare cell 4, and make electrolyte and internal structure of bare cell 4 in uniform contact, thereby reducing the impregnation time cost, improving production efficiency, and ensuring the stability of battery performance.
[0044] Furthermore, in this embodiment, the circulating immersion mechanism 2 further includes a first solenoid valve 26 disposed on the inlet pipe 22 and a second solenoid valve 27 disposed on the outlet pipe 23. The first solenoid valve 26 controls the opening or closing of the inlet pipe 22, and the second solenoid valve 27 controls the opening or closing of the outlet pipe 23. In this application, the circulating immersion mechanism 2 further includes a first solenoid valve 26 and a second solenoid valve 27, with the first solenoid valve 26 disposed on the inlet pipe 22 and the second solenoid valve 27 disposed on the outlet pipe 23.
[0045] When the first solenoid valve 26 is opened and the delivery pump 24 is started, the electrolyte in the electrolyte buffer tank 21 is delivered to the cell wetting chamber 1 through the inlet pipe 22; when the second solenoid valve 27 is opened and the return pump 25 is started, the electrolyte in the cell wetting chamber 1 is returned to the electrolyte buffer tank 21 through the outlet pipe 23, thereby realizing the circulation of electrolyte between the cell wetting chamber 1 and the circulating wetting mechanism 2.
[0046] When the first solenoid valve 26 is closed and the delivery pump 24 stops running, the electrolyte stops being delivered from the electrolyte buffer tank 21 to the cell wetting chamber 1 through the inlet pipe 22; when the second solenoid valve 27 is closed and the return pump 25 stops running, the electrolyte stops flowing back from the cell wetting chamber 1 to the electrolyte buffer tank 21 through the outlet pipe 23, thereby facilitating the control of the electrolyte circulation between the cell wetting chamber 1 and the circulating wetting mechanism 2.
[0047] In this embodiment, the circulating wetting mechanism 2 further includes a first filter 28 disposed on the inlet pipe 22 and a second filter 29 disposed on the outlet pipe 23. The first filter 28 is used to filter the electrolyte delivered from the electrolyte buffer tank 21 to the cell wetting chamber 1, and the second filter 29 is used to filter the electrolyte returned from the cell wetting chamber 1 to the electrolyte buffer tank 21.
[0048] Because the electrolyte stored in the electrolyte buffer tank 21 may contain impurities, this impure electrolyte, when transported to the cell immersion chamber 1, will affect the immersion of the bare cell 4, thus impacting battery performance. Furthermore, during the immersion of the bare cell 4 in the cell immersion chamber 1, impurities may also be generated during the contact process between the electrolyte and various parts of the bare cell 4. This impure electrolyte, flowing back to the electrolyte buffer tank 21, will further affect the immersion of the bare cell 4 during subsequent immersion cycles.
[0049] Therefore, in this application, the circulating wetting mechanism 2 also includes a first filter 28 and a second filter 29. The first filter 28 is disposed on the inlet pipe 22. During the process of transporting the electrolyte in the electrolyte buffer tank 21 to the cell wetting chamber 1, the first filter 28 filters the electrolyte flowing through the inlet pipe 22, thereby preventing the electrolyte with impurities in the electrolyte buffer tank 21 from entering the cell wetting chamber 1.
[0050] The second filter 29 is installed on the outlet pipe 23. During the process of the electrolyte flowing back to the electrolyte buffer tank 21 after the bare cell 4 has been immersed in the cell immersion chamber 1, the second filter 29 filters the electrolyte flowing through the outlet pipe 23, thereby preventing the electrolyte with impurities in the cell immersion chamber 1 from flowing back to the electrolyte buffer tank 21, thus ensuring the wetting effect of the electrolyte on the electrolyte and ensuring the performance of the battery.
[0051] In this embodiment, the immersion control mechanism 3 includes a detection device 31 and a switching device 32. The detection device 31 is electrically connected to the bare battery cell 4 in the battery cell immersion chamber 1, allowing the detection device 31 to detect the parameters of the bare battery cell 4. The switching device 32 is simultaneously electrically connected to the detection device 31 and the circulating immersion mechanism 2. After receiving the signal from the detection device 31, the switching device 32 controls the circulating immersion mechanism 2 to start or stop, stopping the electrolyte circulation after the bare battery cell 4 reaches the preset immersion effect. This further improves the uniformity of immersion of the bare battery cell 4 and ensures the stability of battery performance.
[0052] Specifically, in this embodiment, the detection device 31 includes a digital voltmeter connected to the tab of the bare cell 4 and a battery internal resistance tester connected to the tab of the bare cell 4. The voltage of the bare cell 4 is detected by connecting the digital voltmeter to the tab of the bare cell 4; the internal resistance of the bare cell 4 is detected by connecting the battery internal resistance tester to the tab of the bare cell 4. Based on whether the voltage and internal resistance of the bare cell 4 reach preset values, it is determined whether the wetting of the bare cell 4 meets the preset requirements.
[0053] When the digital voltmeter and battery internal resistance tester detect that the voltage and internal resistance of the bare cell 4 have not reached the preset values, the switching device 32 receives the electrical signals from the digital voltmeter and battery internal resistance tester and controls the first solenoid valve 26 to open and the delivery pump 24 to start, so that the electrolyte in the electrolyte buffer tank 21 is delivered to the cell wetting chamber 1 through the inlet pipe 22; at the same time, it controls the second solenoid valve 27 to open and the return pump 25 to start, so that the electrolyte in the cell wetting chamber 1 flows back to the electrolyte buffer tank 21 through the outlet pipe 23, thereby realizing the circulation of electrolyte between the cell wetting chamber 1 and the circulating wetting mechanism 2, so that the bare cell 4 in the cell wetting chamber 1 is wetted during the process of the electrolyte flowing in the cell wetting chamber 1.
[0054] When the digital voltmeter and battery internal resistance tester detect that the voltage and internal resistance of the bare cell 4 have reached preset values, the switching device 32 receives the electrical signals from the digital voltmeter and battery internal resistance tester and controls the first solenoid valve 26 to close and the delivery pump 24 to stop running, so that the electrolyte stops being delivered from the electrolyte buffer tank 21 to the cell impregnation chamber 1 through the inlet pipe 22; at the same time, it controls the second solenoid valve 27 to close and the return pump 25 to stop running, so that the electrolyte stops flowing back from the cell impregnation chamber 1 to the electrolyte buffer tank 21 through the outlet pipe 23, thereby further improving the uniformity of the impregnation of the bare cell 4 and ensuring the stability of the battery performance.
[0055] In this embodiment, the wetting control structure 3 also includes a flow regulating device 33, which is installed in the circulating wetting mechanism 2. The flow regulating device 33 measures and regulates the flow rate of the electrolyte in the circulating wetting mechanism 2, so that the electrolyte circulates in the circulating wetting mechanism 2 and the cell wetting chamber 1 at a preset flow rate. This not only increases the wetting speed of the bare cell 4, but also ensures that the electrolyte is in uniform contact with the internal structure of the bare cell 4, thereby improving production efficiency and ensuring the stability of battery performance.
[0056] Specifically, in actual implementation, the flow regulating device 33 may include a flow meter installed on both the inlet pipe 22 and the outlet pipe 23 of the circulating wetting mechanism 2, and a flow control module electrically connected to the flow meter, which measures the flow rate of the electrolyte in the inlet pipe 22 and the outlet pipe 23 through the flow meter.
[0057] After receiving the electrical signal from the flow meter, the flow control module controls the operating power of the delivery pump 24 and the return pump 25. This allows the delivery pump 24 and the return pump 25 to adjust the flow rate of the electrolyte in the inlet pipe 22 and the outlet pipe 23, so that the electrolyte circulates in the electrolyte buffer tank 21 and the cell wetting chamber 1 at a preset flow rate. This not only increases the wetting speed of the bare cell 4, but also ensures that the electrolyte is in uniform contact with the internal structure of the bare cell 4, thereby improving production efficiency and ensuring the stability of battery performance.
[0058] The above-described contents can be implemented individually or in combination in various ways, and all such variations are within the protection scope of this utility model.
[0059] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.
[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.
Claims
1. A bare cell infiltration device for lithium ion batteries, characterized by: The battery cell infiltration device comprises a battery cell infiltration bin (1), a circulation infiltration mechanism (2), and an infiltration control mechanism (3). The battery cell infiltration bin (1) is used for accommodating a bare battery cell (4) for electrolyte infiltration. The circulation infiltration mechanism (2) is connected with the battery cell infiltration bin (1) and is used for delivering electrolyte to the battery cell infiltration bin (1) and recycling electrolyte in the battery cell infiltration bin (1). The infiltration control mechanism (3) is connected with the battery cell infiltration bin (1) and the circulation infiltration mechanism (2) and is used for controlling the circulation infiltration mechanism (2) to start or stop.
2. A bare cell impregnation device for lithium ion batteries as claimed in claim 1, characterized in that: The circulation infiltration mechanism (2) comprises an electrolyte buffer tank (21) used for storing electrolyte, a liquid inlet pipe (22) connected with the battery cell infiltration bin (1), and a liquid outlet pipe (23) connected with the battery cell infiltration bin (1).
3. A bare cell impregnation apparatus for lithium ion batteries as claimed in claim 2, characterized in that: One end of the liquid inlet pipe (22) is connected with the electrolyte buffer tank (21), and the other end is connected with the top of the battery cell infiltration bin (1). One end of the liquid outlet pipe (23) is connected with the electrolyte buffer tank (21), and the other end is connected with the bottom of the battery cell infiltration bin (1).
4. A bare cell impregnation apparatus for lithium ion batteries as claimed in claim 3, characterized in that: The end of the liquid inlet pipe (22) connected with the electrolyte buffer tank (21) extends to the bottom of the electrolyte buffer tank (21). The end of the liquid outlet pipe (23) connected with the electrolyte buffer tank (21) extends to the top of the electrolyte buffer tank (21).
5. A bare cell impregnation apparatus for lithium ion batteries as defined in claim 2, characterized in that: The circulation infiltration mechanism (2) further comprises a delivery pump (24) arranged on the liquid inlet pipe (22) and a return pump (25) arranged on the liquid outlet pipe (23). The delivery pump (24) drives electrolyte to flow from the electrolyte buffer tank (21) to the battery cell infiltration bin (1). The return pump (25) drives electrolyte to return from the battery cell infiltration bin (1) to the electrolyte buffer tank (21).
6. A bare cell impregnation apparatus for lithium ion batteries as claimed in claim 2, characterized in that: The circulation infiltration mechanism (2) further comprises a first electromagnetic valve (26) arranged on the liquid inlet pipe (22) and a second electromagnetic valve (27) arranged on the liquid outlet pipe (23). The first electromagnetic valve (26) controls the opening or closing of the liquid inlet pipe (22). The second electromagnetic valve (27) controls the opening or closing of the liquid outlet pipe (23).
7. A bare cell impregnation apparatus for lithium ion batteries as claimed in claim 2, characterized in that: The circulation infiltration mechanism (2) further comprises a first filter (28) arranged on the liquid inlet pipe (22) and a second filter (29) arranged on the liquid outlet pipe (23). The first filter (28) is used for filtering electrolyte delivered from the electrolyte buffer tank (21) to the battery cell infiltration bin (1). The second filter (29) is used for filtering electrolyte returned from the battery cell infiltration bin (1) to the electrolyte buffer tank (21).
8. A bare cell impregnation apparatus for lithium ion batteries as defined in claim 1, characterized in that: The infiltration control mechanism (3) comprises a detection device (31) and a switching device (32). The detection device (31) is electrically connected with the bare battery cell (4). The switching device (32) is electrically connected with the circulation infiltration mechanism (2).
9. A bare cell impregnation apparatus for lithium ion batteries as claimed in claim 8, characterized in that: The detection device (31) comprises a digital voltmeter connected with the tab of the bare battery cell (4), and a battery internal resistance tester connected with the tab of the bare battery cell (4).
10. A bare cell impregnation apparatus for lithium ion batteries as defined in claim 8, characterized in that: The infiltration control mechanism (3) further comprises a flow adjusting device (33) arranged in the circulating infiltration mechanism (2).