Novel negative pressure formation air extractor for power battery
By setting up a throttle in the air extraction pipe, the pipeline airflow is reduced, and the problem of large electrolyte loss in the negative pressure synthesis process is solved, which significantly improves the battery interface and film formation effect, and the electrolyte loss is reduced from 15g to 5g.
Patent Information
- Application Number
- CN202420085355.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-12
- Publication Date
- 2025-01-14
- Estimated Expiration
- 2034-01-12
AI Technical Summary
In the existing negative pressure forming process, the airflow and pressure during the extraction process are too high, resulting in the electrolyte being easily extracted, resulting in large losses in the electrolyte inside the battery, affecting the battery cell interface and film formation effect.
Design a new negative pressure-to-energy device for power batteries. By setting up a throttle in the vent pipe, the air flow in the duct is reduced and the vacuum flow is reduced, including negative pressure source, gas-liquid separator, air-exhaust pipe and liquid contact cup, throttling A number of small-size throttle holes are provided on the sheet to disperse the airflow and reduce the impact force of the airflow.
It effectively reduces the electrolyte loss during the chemical formation, improves the cell interface and film formation effect after the chemical formation, and reduces the electrolyte loss from 15g to about 5g, significantly improving the battery performance.
Smart Images
Figure CN222355170U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to lithium battery processing technology, in particular to a new type of negative pressure formation exhaust device for power batteries. Background Art
[0002] Formation is an important part of the lithium battery production process. The formation process can be divided into high temperature formation, low temperature formation, high current formation, low current formation, open formation, closed formation and negative pressure formation. During the charge and discharge process, the battery cell is evacuated to -80KPa from the injection port. Negative pressure formation can remove the generated gas in time, ensuring the stability and consistency of the SEI film.
[0003] During the actual operation of negative pressure formation, a vacuum device is usually used, which is directly connected to the injection hole through a negative pressure tube to pump negative pressure. However, during the vacuum process, the injection hole is directly connected to the negative pressure, and the negative pressure gas source pipeline is unobstructed for vacuuming, resulting in very large airflow and pressure, which has a particularly good suction effect on the inside of the battery cell. The electrolyte is easily pumped out, resulting in a large loss of electrolyte inside the power battery, which in turn affects the battery cell interface and film-forming effect after negative pressure formation. Utility Model Content
[0004] In view of the shortcomings of the prior art, the technical problem to be solved by the utility model is to provide a new type of negative pressure formation and exhaust device for power batteries, which can reduce the loss of power battery electrolyte caused by exhaust during formation, thereby improving the interface and film-forming effect after formation.
[0005] In order to achieve the above object, the utility model is implemented through the following technical solutions: a new type of negative pressure formation exhaust device for power batteries, comprising:
[0006] Negative pressure source;
[0007] The gas-liquid separator is connected to the liquid injection hole in communication with the battery formation cabinet through a connecting pipe;
[0008] An air extraction pipe connected between the negative pressure source and the air outlet of the gas-liquid separator;
[0009] a liquid receiving cup connected to the liquid outlet of the gas-liquid separator; and
[0010] The throttle plate is embedded in the channel of the exhaust pipe, and the throttle plate is provided with a flow passage which passes through from top to bottom.
[0011] Furthermore, the flow passage includes a plurality of throttling holes, and the plurality of throttling holes are arranged at intervals on the throttling plate.
[0012] Furthermore, the plurality of throttling holes are evenly spaced in the circumferential direction.
[0013] Furthermore, the number of the throttling holes is 18-22, and the hole diameter is 90-110 microns.
[0014] Furthermore, the exhaust pipe includes a first air pipe, a second air pipe and a connecting piece, the first air pipe and the second air pipe are sealed and connected via the connecting piece, the throttle plate is embedded in the first air pipe, and the contact surface between the throttle plate and the first air pipe is in a sealed state.
[0015] Furthermore, an annular limiting groove is provided at the end of the first air pipe, the throttle plate is clamped in the limiting groove, the connecting piece includes an external thread and an internal thread, the external thread is arranged on the outer wall of the second air pipe close to one end of the first air pipe, the internal thread is arranged on the side wall of the limiting groove, and the external thread and the internal thread can be threadedly sealed and connected.
[0016] Furthermore, a first sealing gasket is provided at the bottom end of the limiting groove.
[0017] Furthermore, a second sealing gasket is provided on the end surface of the second air pipe.
[0018] Furthermore, a third sealing gasket is provided on the side wall of the throttle plate.
[0019] Furthermore, the second air pipe includes a tube body and an adapter plate, the adapter plate is coaxially and rotatably connected to the tube body, the second sealing gasket is arranged at an end of the adapter plate, and the external thread is arranged on the tube body.
[0020] Beneficial effects of the utility model:
[0021] When using the new negative pressure formation exhaust device for power batteries, the gas-liquid separator is first connected to the liquid injection hole of the battery formation cabinet through a connecting pipe. Then, the liquid receiving cup is connected to the liquid outlet of the gas-liquid separator, and then the exhaust pipe with a throttle plate is connected between the negative pressure source and the gas outlet of the gas-liquid separator.
[0022] In negative pressure formation, by setting a throttle plate in the exhaust pipe, the throttle plate actually blocks and reduces the airflow in the pipe, thereby reducing the vacuum flow, and further reducing the loss of power battery electrolyte caused by exhaust during formation, which in turn leads to the effect of battery cell interface and film formation after negative pressure formation. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to more clearly illustrate the specific implementation of the utility model, the following will briefly introduce the drawings required for use in the specific implementation. In all the drawings, each element or part is not necessarily drawn according to the actual scale.
[0024] Figure 1A schematic diagram of a new type of negative pressure formation and exhaust device for a power battery provided by an embodiment of the utility model;
[0025] Figure 2 for Figure 1 A partial enlarged view of the middle part;
[0026] Figure 3 for Figure 1 A schematic diagram of a throttle plate in a new type of negative pressure forming and exhaust device for a power battery is shown;
[0027] Reference numerals:
[0028] 1. Formation cabinet;
[0029] 100, negative pressure source; 200, gas-liquid separator; 300, exhaust pipe; 310, first air pipe; 320, second air pipe; 321, pipe body; 322, adapter plate; 330, first sealing gasket; 340, second sealing gasket; 350, third sealing gasket; 400, liquid receiving cup; 500, throttle plate. DETAILED DESCRIPTION
[0030] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.
[0031] Power batteries are the power source for tools, mostly referring to batteries that power electric vehicles, electric trains, electric bicycles, and golf carts. Power batteries generally include valve-sealed lead-acid batteries, open-top tubular lead-acid batteries, and lithium iron phosphate batteries.
[0032] Formation is an important part of the lithium battery production process. Negative pressure formation can remove the generated gas in time, ensuring the stability and consistency of the SEI film, while ensuring the battery cell interface effect.
[0033] However, during the existing negative pressure formation operation, a negative pressure pipe is usually used to connect the vacuum device directly to the injection hole of the formation cabinet 1 to pump negative pressure. However, since the injection hole is directly connected to the negative pressure during the vacuum process, the vacuum is pumped unimpeded by the negative pressure gas source pipeline, resulting in very large airflow and pressure of the vacuum, which has a particularly good suction effect on the inside of the battery cell. The electrolyte is easily pumped out, resulting in a large loss of electrolyte inside the power battery, sometimes reaching about 15g, which further affects the battery cell interface and film-forming effect after the negative pressure is formed.
[0034] Therefore, the utility model provides a new type of negative pressure formation exhaust device for a power battery to solve the above-mentioned problem.
[0035] Please attend Figure 1-Figure 3 Specifically, the novel negative pressure formation exhaust device for power battery includes a negative pressure source 100, a gas-liquid separator 200, an exhaust pipe 300, a liquid receiving cup 400 and a throttle plate 500.
[0036] When in use, the gas-liquid separator 200 is first connected to the liquid injection hole of the battery formation cabinet 1 through the connecting pipe. Then, the liquid receiving cup 400 is connected to the liquid outlet of the gas-liquid separator 200, and then the air extraction pipe 300 with the throttle plate 500 is connected between the negative pressure source 100 and the gas outlet of the gas-liquid separator 200.
[0037] In negative pressure formation, by setting a throttle plate 500 in the exhaust pipe 300, the throttle plate 500 actually plays a role in blocking and reducing the airflow in the pipe, thereby reducing the vacuum flow, and further reducing the loss of power battery electrolyte caused by exhaust during formation, which in turn leads to the effect of battery cell interface and film formation after negative pressure formation.
[0038] In a specific implementation, the flow passage may include a plurality of throttling holes 510 , and the plurality of throttling holes 510 are arranged at intervals on the throttling plate 500 .
[0039] Compared with a flow channel composed of a single large-aperture throttling hole 510 of the same cross-sectional area, a flow channel composed of multiple smaller-diameter throttling holes 510 can disperse the airflow, reduce the impact force of the airflow, further enhance the effect of blocking and reducing the airflow in the pipeline, thereby further reducing the vacuum flow, and further reducing the loss of power battery electrolyte caused by exhaust during formation.
[0040] Furthermore, multiple throttle holes 510 are evenly arranged at circumferential intervals. This is convenient for processing and can standardize the outflow of airflow. Experiments have shown that when the number of throttle holes 510 is 18-22 and the aperture is 90-110 microns, the loss of battery electrolyte is reduced to the minimum, and the loss of battery electrolyte can be reduced from about 15g to about 5g, reducing the loss by 10g, and significantly improving the interface and film-forming effect after formation.
[0041] In addition, during production and use, in order to facilitate the installation of the throttle plate 500, the exhaust pipe 300 is arranged as follows.
[0042] Specifically, the exhaust pipe 300 includes a first air pipe 310, a second air pipe 320 and a connector. The first air pipe 310 and the second air pipe 320 are sealed and connected via the connector. The throttle plate 500 is embedded in the first air pipe 310, and the contact surface between the throttle plate 500 and the first air pipe 310 is in a sealed state.
[0043] During assembly, the first air pipe 310 and the second air pipe 320 are first separated, and then the throttle plate 500 is embedded in the first air pipe 310 . Next, the throttle plate 500 is embedded in the first air pipe 310 again through the connecting piece.
[0044] In this embodiment, an annular limiting groove is provided at the end of the first air pipe 310, and the throttle plate 500 is clamped in the limiting groove. The limiting groove can limit the throttle plate 500, so as to facilitate the installation of the throttle plate 500.
[0045] The connector includes an external thread and an internal thread. The external thread is arranged on the outer wall of the second air pipe 320 near one end of the first air pipe 310, and the internal thread is arranged on the side wall of the limiting groove. The external thread and the internal thread can be threadedly sealed. With this threaded connection method, the first air pipe 310 and the second air pipe 320 can be quickly connected, thereby improving the installation speed. Of course, in other methods, the connector can be other methods, such as a snap connector.
[0046] In addition, in order to improve the installation sealing of the throttle plate 500, a first sealing gasket 330 may be provided at the bottom end of the limiting groove, a second sealing gasket 340 may be provided on the end surface of the second air pipe 320, and a third sealing gasket 350 may be provided on the side wall of the throttle plate 500.
[0047] The first sealing gasket 330 , the second sealing gasket 340 and the third sealing gasket 350 can form a sealing protection at the throttle plate 500 to prevent the airflow from flowing out from around the throttle plate 500 and even from flowing out from the connecting end surface of the first air pipe 310 and the second air pipe 320 .
[0048] In addition, as another preferred embodiment, the second air pipe 320 includes a tube body 321 and an adapter plate 322 , the adapter plate 322 is coaxially rotatably connected to the tube body 321 , the second sealing gasket 340 is arranged at the end of the adapter plate 322 , and the external thread is arranged on the tube body 321 .
[0049] When the second air pipe 320 is connected to the first air pipe 310 by threaded rotation through the adapter plate 322 , after the adapter plate 322 contacts the throttle plate 500 , the tube body 321 can be further rotated until the adapter plate 322 is pressed against the throttle plate 500 .
[0050] In addition, it should be noted that after assembly, in order to further improve the sealing performance, sealant can be injected between the internal thread and the external thread to further improve the sealing performance.
[0051] By adopting the above-mentioned new type of negative pressure formation and exhaust device for power batteries, the throttle plate 500 plays the role of blocking and reducing the airflow in the pipeline, thereby reducing the vacuum flow, and further reducing the loss of power battery electrolyte caused by exhaust during formation, thereby achieving the purpose of realizing the battery cell interface and film-forming effect after negative pressure.
[0052] In addition, by adopting the device, the throttle plate 500 is easy to install, further improving the convenience of use.
[0053] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.
Claims
1. A new type of negative pressure formation exhaust device for power batteries, characterized in that: include: Negative pressure source; The gas-liquid separator is connected to the liquid injection hole in communication with the battery formation cabinet through a connecting pipe; An air extraction pipe connected between the negative pressure source and the air outlet of the gas-liquid separator; a liquid receiving cup connected to the liquid outlet of the gas-liquid separator; and The throttle plate is embedded in the channel of the exhaust pipe, and the throttle plate is provided with a flow passage which passes through from top to bottom.
2. The novel negative pressure formation exhaust device for power batteries according to claim 1 is characterized in that: The flow passage includes a plurality of throttling holes, and the plurality of throttling holes are arranged at intervals on the throttling plate.
3. The novel negative pressure formation exhaust device for power batteries according to claim 2 is characterized in that: The plurality of throttling holes are evenly arranged at circumferential intervals.
4. The novel negative pressure formation exhaust device for power batteries according to claim 3 is characterized in that: The number of the throttling holes is 18-22, and the hole diameter is 90-110 microns.
5. The novel negative pressure formation exhaust device for power batteries according to claim 1, characterized in that: The exhaust pipe includes a first air pipe, a second air pipe and a connector. The first air pipe and the second air pipe are sealed and connected via the connector. The throttle plate is embedded in the first air pipe, and the contact surface between the throttle plate and the first air pipe is in a sealed state.
6. The novel negative pressure formation exhaust device for power batteries according to claim 5, characterized in that: An annular limiting groove is provided at the end of the first air pipe, the throttle plate is clamped in the limiting groove, the connecting piece includes an external thread and an internal thread, the external thread is arranged on the outer wall of the second air pipe close to one end of the first air pipe, the internal thread is arranged on the side wall of the limiting groove, and the external thread and the internal thread can be threadedly sealed and connected.
7. The novel negative pressure formation exhaust device for power batteries according to claim 6, characterized in that: A first sealing gasket is arranged at the bottom end of the limiting groove.
8. The novel negative pressure formation exhaust device for power batteries according to claim 6, characterized in that: A second sealing pad is disposed on the end surface of the second air pipe.
9. The novel negative pressure formation exhaust device for power batteries according to claim 6, characterized in that: A third sealing gasket is arranged on the side wall of the throttle plate.
10. The novel negative pressure formation exhaust device for power batteries according to claim 8, characterized in that: The second air pipe includes a tube body and an adapter plate, the adapter plate is coaxially rotatably connected to the tube body, the second sealing gasket is arranged at the end of the adapter plate, and the external thread is arranged on the tube body.