CN219736698U - Helium return error-proofing verification system of lithium ion battery cell - Google Patents
Helium return error-proofing verification system of lithium ion battery cell Download PDFInfo
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- CN219736698U CN219736698U CN202321026101.7U CN202321026101U CN219736698U CN 219736698 U CN219736698 U CN 219736698U CN 202321026101 U CN202321026101 U CN 202321026101U CN 219736698 U CN219736698 U CN 219736698U
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- 239000001307 helium Substances 0.000 title claims abstract description 143
- 229910052734 helium Inorganic materials 0.000 title claims abstract description 143
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 title claims abstract description 143
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 40
- 238000012795 verification Methods 0.000 title claims abstract description 24
- 238000001514 detection method Methods 0.000 claims abstract description 121
- 238000007789 sealing Methods 0.000 claims abstract description 34
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 230000005856 abnormality Effects 0.000 abstract description 4
- 238000004146 energy storage Methods 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000007689 inspection Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000003292 glue Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 239000011258 core-shell material Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
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Abstract
The utility model provides a helium return error-proof verification system of a lithium ion battery cell, which belongs to the field of energy storage device production equipment and comprises the following components: the error proofing standard component is provided with an inner cavity for containing helium, the error proofing standard component is provided with a helium filling port and a detecting port which are respectively communicated with the inner cavity, the detecting device comprises a pressure supplying instrument, a detecting pipeline and a helium detecting instrument for detecting the concentration of the helium, one end of the detecting pipeline is communicated with the helium detecting instrument, the other end of the detecting pipeline is communicated with the detecting port, the pressure supplying instrument is communicated with the detecting pipeline and provides positive air pressure or negative air pressure to the detecting pipeline, the positions, close to the two ends, of the detecting pipeline are respectively provided with a through stop valve, and the communicating positions of the pressure supplying instrument and the detecting pipeline are between the two through stop valves. The utility model can verify the helium returning state of the battery cell shell sealing performance detection, prevent false detection of the poor sealing shell caused by abnormality of the battery cell shell sealing performance detection helium returning state, and ensure the product quality of the battery cell.
Description
Technical Field
The utility model belongs to the field of energy storage device production equipment, and particularly relates to a helium return error-proofing verification system of a lithium ion battery cell.
Background
The lithium ion battery core is a basic component unit of the lithium ion battery and generally comprises a shell, and a positive plate, a negative plate, a diaphragm and other structures arranged in the shell. Meanwhile, electrolyte is filled in the shell to convey ions between the positive plate and the negative plate, and conduct current to conduct ions. When the shell of the lithium ion battery core is poorly sealed, the problems of electrolyte evaporation, moisture permeation, swelling and the like exist, so that the performance of the lithium ion battery core is reduced, and even the lithium ion battery core is ignited and exploded. Therefore, the sealing performance of the lithium ion battery core shell directly influences the safety coefficient of the lithium ion battery. At present, when the sealing performance of the shell of the lithium ion battery cell is detected, helium is usually returned to the lithium ion battery cell, namely helium is filled into the shell of the battery cell through a liquid injection port on the shell, the shell is placed in a negative pressure environment after being sealed, whether the helium in the shell leaks or not is detected through a helium detector and other equipment, when the detected helium exceeds a preset threshold value, the helium is considered to leak, the shell is considered to be poor in sealing, and when the detected helium is lower than the preset threshold value, the shell is considered to be good in sealing. However, when helium is not filled into the shell or is not filled enough due to failure of helium filling equipment and the like, even if the shell is not sealed well, the helium detected by the helium detector is still lower than a preset threshold value, so that false detection and false detection are caused, and the shell with poor sealing is circulated to a rear-end process and even is sold to a user after being assembled into a product.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present utility model is directed to a helium recovery error-proofing verification system for a lithium ion battery cell, which is used for solving the problem of false detection caused by insufficient helium filling or helium filling due to equipment failure or the like during detection of sealing performance of a shell in the prior art.
To achieve the above and other related objects, the present utility model provides a helium-returning error-proofing calibration system for a lithium ion battery cell, comprising:
the error-proof standard component is provided with an inner cavity for containing helium, the error-proof standard component is provided with a helium filling port and a detection port which are respectively communicated with the inner cavity,
the detecting device comprises a pressure supply instrument, a detecting pipeline and a helium detector for detecting helium concentration, wherein one end of the detecting pipeline is communicated with the helium detector, the other end of the detecting pipeline is communicated with the detecting port, the pressure supply instrument is communicated with the detecting pipeline and provides positive air pressure or negative air pressure for the detecting pipeline, the positions, close to the two ends, of the detecting pipeline are respectively provided with a through-stop valve, and the communicating positions of the pressure supply instrument and the detecting pipeline are between the two through-stop valves;
the detection pipeline is communicated with the detection port, the detection valve is opened when the detection pipeline is separated from the detection port, and the detection valve is closed when the detection pipeline is separated from the detection port.
Optionally, the error-proofing standard component comprises a standard top cover, the standard top cover is used for being in sealing fit with the shell to form the inner cavity, and the helium filling port and the detection port are arranged on the standard top cover.
Optionally, the error proofing standard further comprises a standard housing, and the standard top cover is connected to the standard housing in a sealing manner to form the inner cavity.
Optionally, the error proofing standard is used for simulating the lithium ion battery cell, and the appearance of the error proofing standard is the same as that of the lithium ion battery cell.
Optionally, the pressure supply instrument comprises a positive pressure machine and a negative pressure machine, and the positive pressure machine and the negative pressure machine are respectively communicated with the detection pipeline.
Optionally, the pressure supply instrument is a positive and negative pressure integrated machine.
Optionally, the pressure supply instrument is communicated with the detection pipeline through a pressure supply pipeline, and a pressure supply valve is arranged on the pressure supply pipeline.
Optionally, the detection valve is a self-closing valve, and when the detection pipeline is communicated with the detection port, the self-closing valve is opened under the action of the detection pipeline.
Optionally, the positive pressure range of the pressure supply instrument is 10kpa to 30kpa.
Optionally, the negative pressure range of the pressure supply instrument is-20 kpa to-50 kpa.
As described above, the helium return error-proof verification system of the lithium ion battery cell has the following beneficial effects: the helium return error-proof verification system of the lithium ion battery cell comprises an error-proof standard component and a detection device, wherein the detection device comprises a pressure supply instrument, a detection pipeline and a helium detector for detecting helium concentration, and the error-proof standard component is provided with an inner cavity, and a helium filling port and a detection port which are respectively communicated with the inner cavity. The inner cavity can be used for containing helium, and helium filling equipment can fill helium into the inner cavity through the helium filling opening. The helium detector can detect the condition of helium in the inner cavity of the error-proof standard piece with the help of the detection pipeline and the pressure supply instrument. When the helium returning detected by the sealing performance of the battery cell shell is normal, the helium detector can detect helium in the error-proof standard component and meets corresponding standards, when the helium returning detected by the sealing performance of the battery cell shell is abnormal due to faults and the like of helium filling equipment, the helium detector cannot detect helium in the error-proof standard component or the detected helium cannot meet corresponding standards, the helium returning state detected by the sealing performance of the battery cell shell is verified, false detection of a poor sealing shell caused by the abnormality of the helium returning state detected by the sealing performance of the battery cell shell is prevented, and the product quality of the battery cell is ensured.
Drawings
FIG. 1 is a schematic diagram of a helium-return error-proofing verification system for a lithium ion battery cell according to an embodiment of the utility model;
FIG. 2 is a schematic structural diagram of an error-proofing standard component according to an embodiment of the present utility model;
fig. 3 is a schematic structural view of a housing and a standard top cover according to an embodiment of the present utility model.
Reference numerals illustrate: error proofing standard 1, helium detector 2, pressure supply appearance 3, first valve 4, pressure supply valve 5, second valve 6, casing 7, standard top cap 8, helium filling port 9, detection port 10, detection pipeline 11, pressure supply pipeline 12.
Detailed Description
Further advantages and effects of the present utility model will become apparent to those skilled in the art from the disclosure of the present utility model, which is described by the following specific examples.
It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the utility model to the extent that it can be practiced, since modifications, changes in the proportions, or otherwise, used in the practice of the utility model, are not intended to be critical to the essential characteristics of the utility model, but are intended to fall within the spirit and scope of the utility model. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the utility model, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the utility model may be practiced.
Referring to fig. 1 to 3, the present embodiment provides a helium-returning error-proofing verification system for a lithium ion battery cell, which includes an error-proofing standard component 1 and a detection device. The error proofing standard 1 has an internal cavity for holding helium. Meanwhile, the error-proof standard component 1 is also provided with a helium filling port 9 and a detection port 10 which are respectively communicated with the inner cavity. When the error-proofing standard 1 returns helium, helium enters the inner cavity from the detection port 10.
The detection device comprises a pressure supply instrument 3, a detection pipeline 11 and a helium detector 2, wherein the helium detector 2 is used for detecting the concentration of helium. One end of the detection pipeline 11 is communicated with the helium detector 2, and the other end of the detection pipeline 11 is used for being communicated with the detection port 10. The detection port 10 is provided with a detection valve, when the detection pipeline 11 is communicated with the detection port 10, the detection valve is opened, and when the detection pipeline 11 is separated from the detection port 10, the detection valve is closed. The pressure supply instrument 3 is communicated with the detection pipeline 11, positive air pressure or negative air pressure is provided in the detection pipeline 11, and the positions, close to the two ends, of the detection pipeline 11 are respectively provided with a through-stop valve, and the communication position of the pressure supply instrument 3 and the detection pipeline 11 is between the two through-stop valves.
The helium detector 2 can detect the condition of helium in the inner cavity of the error-proof standard component 1 with the help of the detection pipeline 11 and the pressure supply instrument 3. When the helium return detected by the sealing performance of the battery cell shell is normal, the helium detector 2 can detect the helium in the error-proof standard component 1 and meet corresponding standards, when the helium return detected by the sealing performance of the battery cell shell is abnormal due to faults and the like of helium filling equipment, the helium detector 2 cannot detect the helium in the error-proof standard component 1 or the detected helium cannot meet corresponding standards, the helium return state detected by the sealing performance of the battery cell shell is verified, false detection of a poor sealing shell caused by the abnormality of the helium return state detected by the sealing performance of the battery cell shell is prevented, and the product quality is ensured.
As shown in fig. 2 and 3, in the present embodiment, the error-proofing standard component 1 includes a standard top cover 8, the standard top cover 8 is used for sealing and matching with the housing 7 to form an inner cavity, and the helium filling port 9 and the detecting port 10 are disposed on the standard top cover 8. The standard top cover 8 can be specially machined for error proofing, and the machining precision can be moderately increased compared with that of a common battery cell so that the standard top cover is well sealed with the shell 7 when the standard top cover is connected with the shell 7.
In some embodiments, the error proofing standard 1 further comprises a standard housing to which the standard cap 8 is sealingly connected to form an internal cavity. Specifically, in this embodiment, the housing 7 of the error-proofing standard component 1 also adopts a specially processed standard housing, and the processing precision thereof can be moderately increased compared with that of the common housing 7, so that the sealing between the standard housing and the standard top cover 8 is better, and the influence on the verification result due to poor sealing between the standard housing and the standard top cover 8 is avoided.
In this embodiment, the housing 7 of the error-proofing standard component 1 adopts a housing of a common electrical core, and the error-proofing standard component 1 is obtained by connecting a standard top cover 8 to a common housing 7, so that separate processing is not required, and the processing cost of the error-proofing standard component 1 is reduced.
Specifically, in this embodiment, the error-proofing standard component 1 is used for simulating a lithium ion battery cell, and the appearance of the error-proofing standard component 1 is the same as that of the lithium ion battery cell. The appearance of the error-proofing standard component 1 is the same as that of the lithium ion battery core, so that the error-proofing standard component 1 can flow in the lithium ion battery core production line, helium return condition can be directly checked in the production line, independent operation is not needed, and simplicity and convenience are realized.
In some embodiments, the pressure supply instrument 3 comprises a positive pressure machine and a negative pressure machine, the positive pressure machine and the negative pressure machine are respectively communicated with the detection pipeline 11, the pressure supply instrument 3 can be obtained by combining the existing positive pressure machine and the existing negative pressure machine, independent purchase is not needed, and equipment cost is reduced. In this embodiment, the pressure supply apparatus 3 is a positive and negative pressure integrated machine, and can supply positive pressure or negative pressure. Compared with the combination of a positive pressure machine and a negative pressure machine, the positive and negative pressure integrated machine has the advantages of small volume, small occupied space, convenient connection with the detection pipeline 11 and simple operation.
In some embodiments, the pressure supply device 3 is directly connected to the detection pipeline 11, and no additional pipeline is needed, which is beneficial to the simplification of the pipeline. In this embodiment, the pressure supply instrument 3 is communicated with the detection pipeline 11 through a pressure supply pipeline 12, the pressure supply pipeline 12 is provided with a pressure supply valve 5, and the pressure supply valve 5 is used for opening or cutting off the pressure supply pipeline 12, so as to open or stop pressure supply. The pressure supply valve 5 is opened or stopped to supply pressure, so that the operation is simple, the pressure supply instrument 3 does not need to be started or stopped, and the reaction is rapid and quick.
In some embodiments, the detection valve is a shut-off valve, the opening or closing of which is controlled manually. In this embodiment, the detection valve is a self-closing valve, and the self-closing valve is in a normally closed state. When the detection pipeline 11 is communicated with the detection port 10, the self-closing valve is automatically opened under the action of the detection pipeline 11, and when the detection pipeline 11 is not communicated with the detection port 10 or the detection pipeline 11 is separated from the detection port 10, the self-closing valve is automatically closed without manual control, so that the automatic self-closing valve is simple and convenient.
Specifically, the self-closing valve may be a valve plate disposed in the inner cavity corresponding to the detection port 10, when helium is filled in the inner cavity, the pressure in the inner cavity increases, the valve plate blocks the detection port 10 under the action of the pressure, the detection port 10 is closed, and the helium in the inner cavity is difficult to escape. When the detection pipeline 11 is connected with the detection port 10, the detection pipeline 11 pushes the valve plate open, and the detection port 10 is opened, so that helium in the inner cavity can enter the detection pipeline 11.
In this embodiment, the positive pressure range of the pressure supply device 3 is 10kpa to 30kpa, and the negative pressure range of the pressure supply device 3 is-20 kpa to-50 kpa. The positive pressure range and the negative pressure range of the pressure supply instrument 3 can be reasonably set according to the actual pressure requirement of the error proofing standard piece 1 for helium detection.
Specifically, in this embodiment, the through-stop valve on one end of the detection pipeline 11 near the helium detector 2 is the first valve 4, and the through-stop valve on the other end is the second valve 6. When actually carrying out error-proofing verification on helium return of lithium ion battery cell, the method comprises the following steps:
(1) And (3) sealing and welding the standard top cover 8 and the shell 7 to obtain the error-proofing standard piece 1. The laser welding is adopted, and has the advantages of small deformation, high speed and the like, and is suitable for sealing welding. The housing 7 has a bare cell inside to simulate the internal structure of a real cell.
(2) And filling helium into the error-proof standard component 1 according to a normal production helium return checking flow of a normal cell.
Specifically, the error-proofing standard component 1 can be added into a production line of a normal battery cell at a fixed first inspection node and a fixed routing inspection node so as to perform error-proofing verification. The production line carries out normal helium filling on the error-proof standard component 1, and after helium filling, normal glue nailing is carried out, so that normal helium returning action is completed. When the normal electric core is filled with helium, the helium is filled into the electric core through the liquid injection port on the electric core top cover, and after the helium filling is completed, a glue nail is arranged on the liquid injection port to seal the liquid injection port, so that the helium is prevented from leaking. In this embodiment, the helium filling port 9 on the error-proof standard component 1 is the same as the liquid filling port on the normal electric core, so that the electric core production line can fill helium and glue the error-proof standard component 1.
(3) The nailing error-proofing standard component 1 after helium return is connected with one end of a detection pipeline 11 in a detection device, which is far away from the helium detector 2, and the detection pipeline penetrates through a detection valve on a detection port 10 and is communicated with an inner cavity of the error-proofing standard component 1.
Before the detection pipeline is connected with the error-proof standard component 1, the detection device performs self-detection to detect whether helium remains in the pipeline 11. Specifically, the first valve 4 and the pressure supply valve 5 are opened, the second valve 6 is closed, the pressure supply meter 3 supplies micro-positive pressure to the detection pipeline 11, and the gas in the detection pipeline 11 is blown to the helium detector 2 for helium detection. If the helium gas detection result of the helium detector 2 is helium-free, it is indicated that no residual helium gas exists in the detection pipeline 11, and the next operation can be performed; otherwise, it is indicated that residual helium exists in the detection line 11. When residual helium exists in the detection pipeline 11, positive pressure is provided for the detection pipeline 11 through the pressure supply instrument 3, and the residual helium in the detection pipeline 11 is purged and removed until the helium detection result of the helium detector 2 is helium-free.
Before testing, the first valve 4 is closed, the second valve 6 and the pressure supply valve 5 are opened, the pressure supply instrument 3 supplies negative pressure to the detection pipeline 11, the negative pressure is pumped to the inside of the error-proofing standard component 1 through the detection pipeline 11, and the negative pressure value is 20kpa to 50kpa, and the duration is 5s to 10s. The specific duration, negative pressure value and other parameters can be reasonably selected and adjusted according to the deformation of the shell 7 in the error proofing standard piece 1. After negative pressure is pumped, the second valve 6 is closed, the first valve 4 is opened, meanwhile, the pressure supply instrument 3 supplies micro-positive pressure to the detection pipeline 11, gas in the detection pipeline 11 is blown to the helium detector 2, and the helium detector 2 is started to detect helium, wherein the micro-positive pressure range is 10 kpa-30 kpa.
And testing whether the helium concentration in the inner cavity of the error-proofing standard component 1 meets the preset standard value. If the test results of the first inspection node and the inspection node are normal, normal production can be realized; if helium in the inner cavity of the error-proof standard component 1 is not detected, or the helium concentration part in the inner cavity of the error-proof standard component 1 meets the preset standard value, the failure of helium return is indicated, and the risk of being judged as qualified in helium detection due to the fact that the helium is not returned or is not returned enough when the shell of the battery cell is in poor sealing.
As described above, the helium return error-proof verification system of the lithium ion battery cell has the following beneficial effects: the helium return error-proofing verification system of the lithium ion battery cell comprises an error-proofing standard component 1 and a detection device, wherein the detection device comprises a pressure supply instrument 3, a detection pipeline 11 and a helium detector 2 for detecting helium concentration, and the error-proofing standard component 1 is provided with an inner cavity, and a helium filling port 9 and a detection port 10 which are respectively communicated with the inner cavity. The inner chamber can be used for holding helium, and helium filling equipment can be used for filling helium into the inner chamber through a helium filling port 9. The helium detector 2 can detect the condition of helium in the inner cavity of the error-proof standard component 1 with the help of the detection pipeline 11 and the pressure supply instrument 3. When the helium returning detected by the sealing performance of the battery cell shell is normal, the helium detector 2 can detect the helium in the error-proof standard component 1 and meets the corresponding standard, when the helium returning detected by the sealing performance of the battery cell shell is abnormal due to the reasons of faults and the like of helium filling equipment, the helium detector 2 cannot detect the helium in the error-proof standard component 1 or the detected helium cannot meet the corresponding standard, so that the helium returning state detected by the sealing performance of the battery cell shell is verified, the false detection of the poor sealing shell 7 caused by the abnormality of the helium returning state detected by the sealing performance of the battery cell shell is prevented, and the product quality of the battery cell is ensured.
The above embodiments are merely illustrative of the principles of the present utility model and its effectiveness, and are not intended to limit the utility model. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the utility model. Accordingly, it is intended that all equivalent modifications and variations of the utility model be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (10)
1. A helium return error proofing verification system of a lithium ion battery cell is characterized by comprising:
the error-proof standard component is provided with an inner cavity for containing helium, the error-proof standard component is provided with a helium filling port and a detection port which are respectively communicated with the inner cavity,
the detecting device comprises a pressure supply instrument, a detecting pipeline and a helium detector for detecting helium concentration, wherein one end of the detecting pipeline is communicated with the helium detector, the other end of the detecting pipeline is communicated with the detecting port, the pressure supply instrument is communicated with the detecting pipeline and provides positive air pressure or negative air pressure for the detecting pipeline, the positions, close to the two ends, of the detecting pipeline are respectively provided with a through-stop valve, and the communicating positions of the pressure supply instrument and the detecting pipeline are between the two through-stop valves;
the detection pipeline is communicated with the detection port, the detection valve is opened when the detection pipeline is separated from the detection port, and the detection valve is closed when the detection pipeline is separated from the detection port.
2. The helium-return fault-prevention verification system of a lithium ion battery cell according to claim 1, wherein: the error-proof standard component comprises a standard top cover, the standard top cover is used for being in sealing fit with the shell to form the inner cavity, and the helium filling port and the detection port are arranged on the standard top cover.
3. The helium-return fault-prevention verification system of a lithium ion battery cell according to claim 2, wherein: the error proofing standard component further comprises a standard shell, and the standard top cover is connected to the standard shell in a sealing mode to form the inner cavity.
4. The helium-return fault-prevention verification system of a lithium ion battery cell according to claim 1, wherein: the mistake proofing standard component is used for simulating the lithium ion battery core, and the appearance of the mistake proofing standard component is the same as that of the lithium ion battery core.
5. The helium-return fault-prevention verification system of a lithium ion battery cell according to claim 1, wherein: the pressure supply instrument comprises a positive pressure machine and a negative pressure machine, and the positive pressure machine and the negative pressure machine are respectively communicated with the detection pipeline.
6. The helium-return fault-prevention verification system of a lithium ion battery cell according to claim 1, wherein: the pressure supply instrument is a positive and negative pressure integrated machine.
7. The helium-return fault-prevention verification system of a lithium ion battery cell according to claim 1, wherein: the pressure supply instrument is communicated with the detection pipeline through a pressure supply pipeline, and a pressure supply valve is arranged on the pressure supply pipeline.
8. The helium-return fault-prevention verification system of a lithium ion battery cell according to claim 1, wherein: the detection valve is a self-closing valve, and when the detection pipeline is communicated with the detection port, the self-closing valve is opened under the action of the detection pipeline.
9. The helium-return fault-prevention verification system of a lithium ion battery cell according to claim 1, wherein: the positive pressure range of the pressure supply instrument is 10kpa to 30kpa.
10. The helium-return fault-prevention verification system of a lithium ion battery cell according to claim 1, wherein: the negative pressure range of the pressure supply instrument is-20 kpa to-50 kpa.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321026101.7U CN219736698U (en) | 2023-04-28 | 2023-04-28 | Helium return error-proofing verification system of lithium ion battery cell |
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| CN202321026101.7U CN219736698U (en) | 2023-04-28 | 2023-04-28 | Helium return error-proofing verification system of lithium ion battery cell |
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