CN102297752A - Cell shell leak hunting equipment and leak hunting method thereof - Google Patents

Abstract

The invention discloses a leak detection device and a leakage detection method for a battery casing, belonging to the field of power battery development. The leak detection equipment includes a plugging head and a vacuum system, the liquid injection port of the battery to be tested is connected to the plugging head, the vacuum system includes a pipeline, the plugging head is connected to the pipeline, the There is a vacuum pressure gauge on the pipeline. The present invention improves the sensitivity of battery casing leakage detection by using a vacuum pressure gauge to test pressure changes, so that small leaks can also be detected, ensuring the qualified rate of the battery casing, and at the same time, it has the advantages of simple operation and easy observation of detection results , Leak detection time is short and so on.

Description

Leak testing device and method for battery case

technical field

The invention relates to the field of power battery development, in particular to a leak detection device for detecting leakage points after welding of battery shells.

Background technique

In today's rapidly developing society, traditional energy sources such as oil, coal, and natural gas are decreasing as people increasingly exploit them. Clean, efficient, and large-capacity batteries such as lithium-ion batteries and fuel cells have become an effective way to solve environmental and energy problems faced by modern civilization. , and has been widely used in notebook computers, camcorders, digital cameras, mobile phones and power tools and other products.

Large-capacity battery casings are mostly made of steel and closed by welding. Under harsh conditions such as extremely low temperature, thin air pressure, and high-power discharge power drive, the sealing performance of the large-capacity battery case is very high, so the battery case needs to be tested for leaks. Most of the prior art judges the airtightness of the battery casing by vacuumizing the battery, and then observing whether there are bubbles in the glass bottle filled with liquid on the gas path.

In the process of realizing the present invention, the inventors found at least the following problems in the prior art: when the leakage point of the battery casing is small, the airflow generated is small, and it is difficult to observe the bubbles generated by the liquid.

Contents of the invention

The purpose of the embodiments of the present invention is to address the defects of the above-mentioned prior art, and provide a battery casing leak detection device and a leakage detection method. By using a vacuum pressure gauge to test the pressure change, the sensitivity of the battery casing leakage detection is improved, and the smaller Leaks can also be detected.

The technical scheme that the present invention takes in order to realize the above object is:

A battery case leak detection device, the device includes a plugging head and a vacuum system, the liquid injection port of the battery to be tested is connected to the plugging head, the plugging head is connected to the pipeline of the vacuum system, The pipeline is provided with a vacuum pressure gauge.

The vacuum system specifically includes the pipeline, a vacuum source and a vacuum valve switch, one end of the pipeline is connected to the plugging head, the other end of the pipeline is connected to the vacuum source, and the vacuum valve switch controls the Vacuum source switch.

Further, the vacuum pumping system further includes an air release valve, and the air release valve is arranged on the pipeline.

Further, the battery case leak detection device also includes a battery case clamp seat, the battery case clamp seat includes a lower seat and an upper seat, the lower seat is provided with a battery case splint, and the upper seat is provided with a cylinder , the piston rod of the cylinder is connected to the plugging head, and the cylinder adjusts the position of the piston rod through the cylinder air circuit.

Specifically, the cylinder air circuit includes a first gas injection pipe, a second gas injection pipe, a manual reversing valve and a compressed air source. One end of the first gas injection pipe is connected to the lower end of the cylinder, and the other end is passed through the manual reversing valve. The directional valve is connected or disconnected with the compressed air source, one end of the second gas injection pipe is connected with the upper end of the cylinder, and the other end is connected or disconnected with the compressed air source through the manual directional valve.

Another technical scheme provided by the present invention is:

A method for leak testing a battery case, the method mainly comprising the following steps:

Seal the liquid injection port of the battery case to be tested with a plugging head;

Turn on the vacuum system to vacuumize the battery case to be tested;

When the vacuum pressure gauge shows that the negative pressure is 80-100, close the vacuum system;

Keeping the vacuum in the battery case to be tested for 5-15 seconds;

Observe whether the indicated number of vacuum pressure changes, and judge whether there is a leak.

The opening of the vacuum pumping system specifically includes: opening the vacuum valve switch, and opening the vacuum source.

After the judging whether there is a leakage point, the method further includes: opening the air release valve, releasing the vacuum in the casing of the battery to be tested, and taking out the battery to be tested.

The beneficial effect brought by the technical solution provided by the embodiment of the present invention is: by using a vacuum pressure gauge to test the pressure change, the sensitivity of the battery case leak detection is improved, so that small leaks can also be detected, ensuring that the battery case At the same time, it has the effects of simple operation, easy observation of test results, and short leak test time.

Description of drawings

Fig. 1 is a schematic diagram of a battery casing leak detection device provided in an embodiment of the present invention.

Among them: 1. Compressed air source, 2. Manual reversing valve, 3. First gas injection pipe, 4. Second gas injection pipe, 5. Upper seat, 6. Piston rod, 7. Plugging head, 8. Battery shell splint , 9, lower seat, 10, vacuum pressure gauge, 11, vent valve, 12, vacuum source, 13, vacuum valve switch, 14, pipeline, 15, cylinder.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

Example 1

Referring to FIG. 1 , an embodiment of the present invention provides a battery casing leak detection device, including a plugging head 7 and a vacuum system. The plugging head 7 is connected with the liquid injection port of the battery casing to be tested, and the liquid injection port is isolated from the outside world. The pipeline 14 of the vacuum pumping system is connected with the plugging head 7, and the liquid injection port is connected with the plugging head. 7 is in communication with the vacuum pumping system, and a vacuum pressure gauge 10 is provided on the pipeline 14 .

In the battery case leak detection device provided by the embodiment of the present invention, the vacuum system is turned on during leak detection, and the battery case to be tested is vacuumed through the plugging head 7, and the battery case to be tested is maintained after vacuuming. Vacuum degree, the pressure change is observed through the vacuum pressure gauge. Due to the high sensitivity of the vacuum pressure gauge, the sensitivity of the battery case leak detection is improved by using the vacuum pressure gauge to observe the pressure change, and the qualified rate of the battery case is guaranteed. The leak detection equipment The operation is simple, the detection result is easy to observe, and the leak detection time is short.

The vacuum pressure gauge 10 used in the embodiment of the present invention is a high-precision digital display vacuum pressure gauge, and the reading can be accurate to 0.01, which further ensures the sensitivity of leak detection.

Referring to Fig. 1, described vacuum pumping system specifically comprises pipeline 14, vacuum source 12 and vacuum valve switch 13, and one end of pipeline 14 is connected with plugging head 7, and the other end of pipeline 14 is connected with vacuum source 12, and vacuum valve switch 13 is used for controlling The switch of the vacuum source 12 controls the opening and closing of the vacuum pumping system.

The vacuum pumping system provided by the embodiment of the present invention is simple in structure and convenient in operation, and saves time for leak detection.

Referring to Fig. 1, the vacuum pumping system also includes a purge valve 11, the purge valve 11 is arranged on the pipeline 14, the purge valve 11 can be arranged at any position of the pipeline 14, and is arranged at the position near the vacuum source 12 at the lower end of the pipeline 14 better. Release the vacuum in the casing of the battery to be tested through the release valve 11 after the leak detection, which can prevent the battery to be tested from being lifted up by the plugging head 7 under the action of the negative pressure in the casing, which facilitates the connection between the plugging head 7 and the battery. The separation of the battery under test ensures the safety of operation.

Referring to FIG. 1 , in order to fix and remove the battery case to be tested conveniently, the battery case leak detection device provided by the embodiment of the present invention further includes a battery case clamp seat. Described battery case holder comprises lower seat 9 and upper seat 5, and lower seat 9 is provided with battery case splint 8, is used for clamping described battery to be tested, and upper seat 5 is provided with cylinder 15, and the piston rod of cylinder 15 6 is connected with one end of the plugging head 7, and the cylinder 15 adjusts the position of the piston rod 6 through the cylinder air circuit.

In order to facilitate the movement of the piston rod 6 so that the plugging head 7 can smoothly block or leave the liquid injection port, the air circuit of the cylinder includes a first gas injection pipe 3, a second gas injection pipe 4, a manual reversing valve 2 and a compression valve. Air source 1. One end of the first gas injection pipe 3 is connected to the lower end of the cylinder 15, and the other end is connected or disconnected to the compressed air source 1 through the manual reversing valve 2. When the first gas injection pipe 3 is connected to the compressed air source 1, the compressed air source 1 passes through The first gas injection pipe 3 injects gas to the lower part of the cylinder 15, pushes the piston rod 6 to move upward, and drives the plugging head 7 to leave the liquid injection port; one end of the second gas injection pipe 4 is connected to the upper end of the cylinder 15, and the other end is manually reversed. The valve 2 is connected or disconnected from the compressed air source 1. When the second air injection pipe 4 is connected to the compressed air source 1, the compressed air source 1 injects air into the upper part of the cylinder 15 through the second air injection pipe 4, pushing the piston rod 6 to move downward. , to drive the plugging head 7 to move downwards so as to block the liquid injection port.

Example 2

An embodiment of the present invention provides a method for measuring the leak of a battery case by using the battery case leak detection device provided in Embodiment 1. The method mainly includes the following steps:

Referring to Fig. 1, seal the liquid injection port of the battery casing to be tested with the plugging head 7;

Turn on the vacuum system to vacuumize the battery case to be tested;

When the vacuum gauge 10 shows that the negative pressure is 80-100, the vacuum pumping system is closed;

Keeping the vacuum in the battery case to be tested for 5-15 seconds;

Observe whether the reading of the vacuum pressure gauge 10 changes, and judge whether there is a leak. When observing, if the reading of the vacuum pressure gauge 10 drops, it means that gas enters the battery casing to be tested from the outside, that is, there is a leak in the battery casing to be tested, and if the reading remains unchanged, it means that there is no leak , the battery case to be tested is qualified.

The opening of the vacuum pumping system specifically includes: opening the vacuum valve switch 13 and opening the vacuum source 12 .

After the judging whether there is a leak point, it also includes: opening the purge valve 11 to release the vacuum in the casing of the battery to be tested.

After the vacuum is released, start the manual reversing valve 2 to make the compressed air source 1 inject gas into the cylinder 15 through the first gas injection pipe 3, so that the piston rod 6 moves upward, and the plugging head 7 leaves the battery case to be tested , take out the battery to be tested.

In the battery casing leak detection method provided by the embodiment of the present invention, the vacuum pumping system is turned on during leak detection, and the battery casing to be tested is vacuumed through the plugging head 7, and the battery casing to be tested is maintained after vacuuming. Vacuum degree, the pressure change is observed through the vacuum pressure gauge. Due to the high sensitivity of the vacuum pressure gauge, the sensitivity of the battery case leak detection is improved by using the vacuum pressure gauge to observe the pressure change, and the pass rate of the battery case is guaranteed. At the same time, it is easy to operate, The detection result is easy to observe, the leakage detection time is short and other beneficial effects.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (8)

1. A battery casing leak testing device, characterized in that the device comprises a plugging head and a vacuum system, the liquid injection port of the battery to be tested is connected to the plugging head, and the plugging head is connected to the pumping head. The pipeline connection of the vacuum system is provided with a vacuum pressure gauge on the pipeline. 2. The battery case leak testing device according to claim 1, wherein the vacuum pumping system specifically comprises the pipeline, a vacuum source and a vacuum valve switch, one end of the pipeline is connected to the plugging head, the The other end of the pipeline is connected to the vacuum source, and the vacuum valve switch controls the vacuum source switch. 3 . The battery case leak testing device according to claim 2 , wherein the vacuum pumping system further comprises an air release valve, and the air release valve is arranged on the pipeline. 4 . 4. The battery case leak detection device according to claim 1, characterized in that, the battery case leak detection device further comprises a battery case clamp seat, the battery case clamp seat comprises a lower seat and an upper seat, the lower seat A battery case splint is provided on the seat, and a cylinder is provided on the upper seat, the piston rod of the cylinder is connected with the plugging head, and the position of the piston rod is adjusted by the cylinder air circuit. 5. The battery case leak testing device according to claim 4, wherein the air circuit of the cylinder comprises a first gas injection pipe, a second gas injection pipe, a manual reversing valve and a compressed air source, and the first gas injection pipe One end is connected to the lower end of the air cylinder, the other end is connected or disconnected from the compressed air source through the manual reversing valve, one end of the second gas injection pipe is connected to the upper end of the air cylinder, and the other end is passed through the manual reversing valve. A reversing valve is connected or disconnected from the compressed air source. 6. A battery casing leak detection method, characterized in that said method mainly comprises the following steps: Seal the liquid injection port of the battery case to be tested with a plugging head; Turn on the vacuum system to vacuumize the battery case to be tested; When the vacuum pressure gauge shows that the negative pressure is 80-100, close the vacuum system; Keeping the vacuum in the battery case to be tested for 5-15 seconds; Observe whether the indicated number of vacuum pressure changes, and judge whether there is a leak. 7 . The method for detecting leaks of a battery case according to claim 6 , wherein the opening of the vacuum pumping system comprises: opening a vacuum valve switch, and opening a vacuum source. 7 . 8. The battery casing leak detection method according to claim 7, characterized in that, after the judging whether there is a leak point, it further comprises: opening the purge valve, releasing the vacuum in the battery casing to be tested, and taking out the to-be-tested battery casing. Test battery.