A battery air tightness rapid detection structure and method

Abstract

The invention discloses a structure and method for rapid detection of gas tightness of a storage battery, which belongs to the field of battery detection. The structure and method comprise a positive pressure pipeline and a negative pressure pipeline, wherein a positive pressure pipeline detection gauge is installed on the positive pressure pipeline, and a negative pressure pipeline detection gauge is installed on the negative pressure pipeline. The structure and method also comprise a driving cylinder, a testing cylinder and a double-headed piston, wherein the double-headed piston comprises a driving piston head located in the driving cylinder and a testing piston head located in the testing cylinder. In the testing cylinder, two sides of the testing piston head are respectively a positive pressure chamber and a negative pressure chamber. In the present scheme, all gases entering into the battery cells are sourced from the positive pressure chamber and various connecting pipelines, while all gases leaving the battery cells enter the negative pressure chamber and various connecting pipelines, thus solving the problem in the prior art that impurities are easily brought into the battery and lead powder in the battery is easily brought out of the battery during the battery detection process, thereby affecting the battery quality and harming the health of employees.

Description

Technical Field

[0001] The invention relates to battery detection, and in particular to a structure and method for rapid detection of battery air tightness. Background Art

[0002] As a secondary battery, the valve-regulated lead-acid battery for electric power-assisted vehicles has many advantages such as low price, high voltage, strong temperature adaptability, safety, reliability, and recyclability. It has been fully developed in the past decade and has become one of the power sources of people's daily life. In the entire production process, it has to go through more than 20 complex processes. Some processes are very important, such as the airtightness test after the capping and sealing of the terminals, which is directly related to the major defect modes such as battery string failure and battery acid leakage failure. It is an indispensable link under the current process conditions. Since the general valve-regulated lead-acid battery for electric power-assisted vehicles is composed of six cells in series, each cell is relatively independent and sealed except for the electrical connection through the bridge, to avoid the phenomenon of stringing between adjacent cells (leakage due to poor sealing between adjacent cells) causing self-discharge, and to avoid leakage (leakage due to poor sealing between the battery and the environment) causing sulfuric acid solution to leak out, leading to corrosion, environmental pollution, battery failure, etc.; and in order to quickly detect leakage and stringing between multiple battery cells, the positive and negative pressure detection method is generally used.

[0003] For example, the patent "A seal automatic detection system" has been published, with the announcement number CN210005179U, which includes a pressure chamber, a positive pressure source and a negative pressure source. The positive pressure air pipe of the positive pressure source is connected to the positive pressure connection port of the air path switching device, and the negative pressure air pipe of the negative pressure source is connected to the negative pressure connection port of the air path switching device. The pressure port of the air path switching device is connected to the main air pipe, and the other end of the main air pipe is connected to the pressure inlet of the pressure chamber. The pressure chamber is connected to a plurality of detection branch pipes, and the plurality of detection branch pipes are provided with on-off control valves. The pressure chamber is provided with a first pressure sensor, and the pressure signal detection end of the first pressure sensor is connected to the pressure signal receiving end of the controller pressure chamber. A second pressure sensor is provided on the negative pressure air pipe, and the pressure signal detection end of the second pressure sensor is connected to the negative pressure signal receiving end of the controller, and the positive and negative pressure switching controlled end of the air path switching device is connected to the positive and negative pressure switching control end of the controller; this patent can detect multiple samples at the same time, and the samples will not affect each other, and the detection is stable and reliable; however, the disadvantage of this patent is that it is necessary to perform positive pressure detection and negative pressure detection respectively by switching between positive pressure and negative pressure, which results in a longer detection time. In addition, since its positive pressure source and negative pressure source are connected to the external air, it is easy for external impurities to enter the battery or harmful substances in the battery to leak out.

[0004] Conventional detection structures such as Figure 1As shown, the detection steps and methods are as follows: ① Inject positive pressure compressed air into the battery cell 1, cell 3, and cell 5 through the positive pressure pipeline, close the air inlet switch after the pressure stabilizes, and make the pressure gauge pointer keep this pressure index unchanged and maintain for 3-5 seconds, which is considered that the air tightness of cell 1, cell 3, and cell 5 is qualified; ② Continuing from the previous, release the compressed air pressure of the battery cell 1, cell 3, and cell 5, and then inject positive pressure compressed air into the battery cell 2, cell 4, and cell 6 through the positive pressure pipeline, and close the air inlet switch after the pressure stabilizes, and make the pressure gauge pointer keep this pressure index unchanged and maintain for 3-5 seconds, which is considered that the air tightness of cell 2, cell 4, and cell 6 is qualified; Only after two air tightness tests and both are qualified, can it be determined that the air tightness of the entire battery is qualified. This technical process currently has three defects: ① The six cells of the battery must be tested in two batches, which takes a long time and affects production efficiency; ② Compressed air directly enters the battery cells, which is easy to bring in moisture, oil and impurities, affecting the quality of the battery; ③ After each airtightness test, the lead powder and partition debris inside the battery cell will be brought out when the compressed air is released, causing air pollution and affecting the health of employees. Summary of the invention

[0005] The present invention aims to overcome the problems in the prior art that, during the detection process of a storage battery with multiple battery cells, it takes a long time, and it is easy to bring impurities into the battery and bring lead powder in the battery out of the battery, resulting in low detection efficiency, affected battery quality, and harmful to the health of employees. A battery air tightness rapid detection structure and method are provided, which can perform positive pressure and negative pressure detection at the same time, thereby improving the detection efficiency. In addition, during the detection process, the gas introduced into the battery and the gas taken out of the battery are always isolated from the outside, which will not affect the quality of the battery or the health of the employees.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] The present invention discloses a structure for rapid detection of gas tightness of a storage battery, comprising a positive pressure pipeline and a negative pressure pipeline, wherein the positive pressure pipeline is connected to a battery cell to be detected through a positive pressure branch pipe, and the negative pressure pipeline is connected to a battery cell to be detected through a negative pressure branch pipe, a positive pressure pipeline detection gauge is installed on the positive pressure pipeline, and a negative pressure pipeline detection gauge is installed on the negative pressure pipeline, and further comprising a driving cylinder, a testing cylinder and a double-headed piston, wherein the double-headed piston comprises a driving piston head located in the driving cylinder and a testing piston head located in the testing cylinder; in the testing cylinder, two sides of the testing piston head are respectively a positive pressure chamber and a negative pressure chamber, wherein the positive pressure chamber is connected to the positive pressure pipeline, and the negative pressure chamber is connected to the negative pressure pipeline; in the driving cylinder, two sides of the driving piston head are respectively an active control chamber and a reset control chamber, wherein the active control chamber is provided with an active air port, and the reset control chamber is provided with a reset air port.

[0008] The positive pressure pipeline is used to form a positive pressure in the battery cell, and the negative pressure pipeline is used to form a negative pressure in the battery cell. If the battery cell leaks or has gas cross-talk, the inspector can quickly judge the sealing condition of the battery cell through the positive pressure pipeline detection meter or the negative pressure pipeline detection meter; the driving piston head is used to transmit the pressure of the gas introduced into the active gas port to the test piston head, and the test piston head is used to form a positive pressure chamber and a negative pressure chamber, and adjust the size of the positive pressure chamber and the negative pressure chamber by its displacement; because in this scheme, the gas introduced into the battery cell all comes from the positive pressure chamber and various connecting pipelines, and the gas leaving the battery cell all enters the negative pressure chamber and various connecting pipelines, therefore, no external impurities will enter the battery cell, and harmful substances in the battery cell will not enter the outside air; after the detection is completed, it is only necessary to stop introducing gas into the active gas port. Due to the pressure difference on both sides of the test piston head, the double-headed piston can be automatically reset. During the reset process, the reset gas port inhales external gas into the driving cylinder to maintain pressure balance.

[0009] Preferably, a positive pressure regulating chamber and a positive pressure regulating piston for adjusting the size of the positive pressure regulating chamber are installed on the positive pressure pipeline; a negative pressure regulating chamber and a negative pressure regulating piston for adjusting the size of the negative pressure regulating chamber are installed on the negative pressure pipeline; once a lighter external leakage, cross-cell, etc. occurs in a battery cell, the positive pressure pipeline detection gauge and the negative pressure pipeline detection gauge may still be deflected, and therefore, it is necessary to determine the sealing condition by comparing the readings after deflection with the standard readings; when the detection structure is applied to batteries of different models, due to the different volumes and shapes of battery cells in batteries of different models, the standard reading may not be able to be read after the change, and the structure in the present scheme can balance the volume size change or shape change of the battery cell by adjusting the size of the positive pressure regulating chamber and the negative pressure regulating chamber, so that after the battery model changes, the detection standard values ​​of the positive pressure pipeline detection gauge and the negative pressure pipeline detection gauge will not change, so as to ensure the accuracy of the detection.

[0010] Preferably, the positive pressure regulating piston is installed with a positive pressure regulating push rod and a positive pressure regulating spring on the side facing away from the positive pressure regulating chamber; the negative pressure regulating piston is installed with a negative pressure regulating push rod and a negative pressure regulating spring on the side facing away from the negative pressure regulating chamber. This structure allows the size of the positive pressure regulating chamber and the negative pressure regulating chamber to be adjusted by manually moving the push rod, and the spring can avoid the problem of excessive positive or negative pressure formed in the battery cell causing damage to the battery cell.

[0011] Preferably, a limit block is provided on the part of the double-headed piston located between the test cylinder and the drive cylinder, and a fixed first limit piece and a second limit piece are also installed between the test cylinder and the drive cylinder, and the limit block is located between the first limit piece and the second limit piece; the limit block can ensure that during the detection process, as long as sufficient air pressure is maintained at the active air port, the position of the piston head will not change, thereby ensuring that the sizes of the positive pressure chamber and the negative pressure chamber are the same as expected, avoiding the situation in which the readings in the test table keep changing and are difficult to read due to changes in the air supply pressure.

[0012] Preferably, any two adjacent battery cells are connected to a positive pressure pipeline and a negative pressure pipeline respectively; under the premise of simultaneously detecting multiple battery cells, once a series connection occurs, it is easier to detect due to the greater pressure difference between the battery cells in series.

[0013] A method for rapid detection of battery air tightness, using the above-mentioned rapid detection structure for detection, comprises the following steps:

[0014] ① Divide several battery cells to be tested into positive pressure test cells and negative pressure test cells to ensure that among any two adjacent battery cells, one is a positive pressure test cell and the other is a negative pressure test cell, and then connect the positive pressure branch pipe to the positive pressure test cell and the negative pressure branch pipe to the negative pressure test cell;

[0015] ② Introduce gas into the active gas port, thereby controlling the driving piston head in the driving cylinder to move toward the test cylinder, so that the volume of the positive pressure chamber decreases and the volume of the negative pressure chamber increases, thereby forming a positive pressure relative to the original air pressure in the battery cell in the positive pressure chamber, and forming a negative pressure relative to the original air pressure in the battery cell in the negative pressure chamber;

[0016] ③ Determine the sealing condition of the battery through the positive pressure pipeline test table and the negative pressure pipeline test table.

[0017] Through this method, only one gas source is needed to quickly detect the air tightness of multiple battery cells on the battery, thereby improving the detection efficiency.

[0018] Preferably, in step ②, when testing batteries of different models, first adjust the sizes of the positive pressure regulating chamber and the negative pressure regulating chamber so that when the sealing of batteries of different models is qualified, the readings on the positive pressure pipeline test meter or the negative pressure pipeline test meter are the same, thereby improving the accuracy of the detection.

[0019] Preferably, if the readings on the positive pressure pipeline test gauge or the negative pressure pipeline test gauge deviate from the standard value, adjacent battery cells are tested in sequence through a pair of positive pressure branch pipes and negative pressure branch pipes. This method can further determine the battery cells with leakage or cross-linking.

[0020] Therefore, the present invention has the following beneficial effects: (1) only one gas source is needed to simultaneously perform positive pressure detection and negative pressure detection on different battery cells, thereby reducing the time required for detection and improving detection efficiency; (2) it prevents the outside air from entering the battery cells, causing impurities to enter the battery and affecting the battery quality; (3) it prevents harmful substances in the battery from being brought into the outside air, affecting the health of operators and polluting the environment; (4) by adjusting the size of the positive pressure regulating chamber and the negative pressure regulating chamber, the volume size change or shape change of the battery cells can be balanced to be suitable for the detection of batteries of different models; (5) the size of the positive pressure chamber and the negative pressure chamber will not change during the detection process by means of the limit block, thereby avoiding inaccurate detection due to air pressure fluctuations. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of an existing airtightness detection structure.

[0022] Figure 2 It is a structural schematic diagram of the present invention in an initial state.

[0023] Figure 3 It is a structural schematic diagram of the present invention during the detection process.

[0024] In the figure: 1, negative pressure pipeline test table 2, positive pressure pipeline test table 3, negative pressure pipeline 4, positive pressure pipeline 5, negative pressure regulating chamber 6, positive pressure regulating chamber 7, negative pressure regulating push rod 8, negative pressure regulating spring 9, negative pressure regulating piston 10, positive pressure regulating push rod 11, positive pressure regulating spring 12, positive pressure regulating piston 13, drive cylinder 14, test cylinder 15, active air port 16, drive piston head 17, reset air port 18, first limiter 19, limiter block 20, double-headed piston 21, second limiter 22, positive pressure chamber 23, negative pressure chamber 24, test piston head 25, battery g1, air pipe one g2, air pipe two g3, air pipe three g4, air pipe four g5, air pipe five g6, air pipe six k1, valve hole one k2, valve hole two k3, valve hole three k4, valve hole four k5, valve hole five k6, valve hole six DETAILED DESCRIPTION

[0025] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0026] like Figure 2In the embodiment shown, a battery air tightness rapid detection structure includes a driving cylinder 13, a test cylinder 14, a double-headed piston 20, a negative pressure regulating chamber 5, a positive pressure regulating chamber 6, a negative pressure pipeline detection meter 1, a positive pressure pipeline detection meter 2 and a connecting pipeline; the connecting pipeline includes a positive pressure pipeline 4 and a negative pressure pipeline 3, the positive pressure pipeline is connected to the battery cell to be detected through a positive pressure branch pipe, and the negative pressure pipeline is connected to the battery cell to be detected through a negative pressure branch pipe. In this embodiment, the battery There are six battery cells in 25, and each of the six battery cells is provided with six valve holes. The negative pressure branch pipe includes air pipe one g1, air pipe three g3, and air pipe five g5, and the positive pressure air pipe includes air pipe two g2, air pipe four g4, and air pipe six g6. When testing air tightness, air pipe one, air pipe two, air pipe three, air pipe four, air pipe five, and air pipe six are connected to valve hole one k1, valve hole two k2, valve hole three k3, valve hole four k4, valve hole five k5, and valve hole six k6, respectively, and each is sealed.

[0027] The double-headed piston includes a driving piston head 16 located in the driving cylinder and a testing piston head 24 located in the testing cylinder; in the testing cylinder, the two sides of the testing piston head are respectively a positive pressure chamber 22 and a negative pressure chamber 23, the positive pressure chamber is connected to the positive pressure pipeline, and the negative pressure chamber is connected to the negative pressure pipeline; in the driving cylinder, the two sides of the driving piston head are respectively an active control chamber and a reset control chamber, the active control chamber is provided with an active air port 15, and the reset control chamber is provided with a reset air port 17.

[0028] The compressed air enters the right end of the driving cylinder from the active air port, pushing the driving piston head to move to the left, and at the same time, the gas at the left end of the driving cylinder is discharged from the reset air port; the driving piston head and the test piston head in the test cylinder are hard-connected by a connecting shaft, so the test piston head also moves to the left, so the negative pressure chamber at the right end of the test cylinder generates negative pressure and the positive pressure chamber at the left end generates positive pressure. A limit block 19 is provided on the connecting shaft, and a fixed first limit member 18 and a second limit member 21 are also installed between the test cylinder and the driving cylinder. The limit block is located between the first limit member and the second limit member. When the limit block moves to the left from the first limit member to contact with the second limit member, the double-headed piston stops moving to keep the negative pressure in the negative pressure chamber and the positive pressure in the positive pressure chamber constant. At this time, the test cylinder The negative pressure generated by the negative pressure chamber and the negative pressure regulating chamber can meet the test needs. Similarly, the positive pressure generated by the positive pressure chamber and the positive pressure regulating chamber of the test cylinder can meet the test needs. The negative pressure generated in the negative pressure chamber is extracted from the gas in the battery cell one, cell three, and cell five through the negative pressure pipe, the negative pressure regulating chamber, the air pipe one, the air pipe three, and the air pipe five from the valve hole one, the valve hole three, and the valve hole five respectively, so that the battery cell one, the cell three, and the cell five are also negatively pressurized. The value is displayed on the negative pressure pipeline detection meter. The pressure value will be affected by different battery models and needs to be adjusted through the negative pressure regulating chamber. The negative pressure regulating chamber includes a negative pressure regulating push rod 7, a negative pressure regulating spring 8, and a negative pressure regulating piston 9. When the pointer of the negative pressure pipeline detection meter can be continuously and stably maintained at the standard value If the negative pressure line test gauge pointer reading continues to change, it means that the battery has leakage, cross-cell problems, etc. If the negative pressure line test gauge pointer reading remains outside the standard value, it means that the space inside the first, third and fifth battery cells of the battery does not meet the standard and needs further testing; at the same time, the positive pressure generated in the positive pressure chamber is injected into the valve hole 2, valve hole 4 and valve hole 6 through the positive pressure pipe, positive pressure regulating chamber, air pipe 2, air pipe 4 and air pipe 6, that is, the battery cell 2, cell 4 and cell 6, so that the battery cell 2, cell 4 and cell 6 also form positive pressure, and its value is displayed on the positive pressure line test gauge, and its pressure value It will be affected by different battery models and needs to be adjusted through the positive pressure regulating chamber. The positive pressure regulating chamber includes a positive pressure regulating push rod 10, a positive pressure regulating spring 11 and a positive pressure regulating piston 12. When the positive pressure gauge pointer can be continuously and stably maintained at the standard value, it means that the air tightness test of the battery cell two, cell four and cell six is ​​qualified, otherwise it is unqualified. The equipment will alarm and mark the unqualified products. If the pointer reading of the positive pressure pipeline detection gauge remains at a position other than the standard value, it means that the space inside the second, fourth and sixth battery cells of the battery does not meet the standard and needs further testing. During the air tightness test, since the gas used to form the negative pressure or positive pressure is fixed and recycled, there is no moisture or harmful impurities brought in, so it will not affect the battery performance.When the air tightness test is finished, the compressed air enters the left end of the driving cylinder from the reset air port, and the gas at the right end of the driving cylinder is discharged from the active air port. At this time, the driving piston head will drive the test piston head to move rightward until the limit block contacts the first limit piece and returns to the standby state. At this time, the negative pressure chamber, the negative pressure regulating chamber and the battery cells 1, 3 and 5 are all restored from the negative pressure state to the normal pressure state, and the positive pressure chamber, the positive pressure regulating chamber and the battery cells 2, 4 and 6 are also restored from the positive pressure state to the normal pressure state. Then, the air pipe 1 and the valve hole 1, the air pipe 3 and the valve hole 3, the air pipe 5 and the valve hole 5, the air pipe 2 and the valve hole 2, the air pipe 4 and the valve hole 4, and the air pipe 6 and the valve hole 6 are disconnected at the same time, and the air tightness test is finished. In this process, since the inside of the battery has been restored to the ambient pressure, no lead powder or partition debris will be brought out, and no pollution will be caused to the environment. ;

Claims

1. A battery air tightness rapid detection structure, comprising a positive pressure pipeline and a negative pressure pipeline, wherein the positive pressure pipeline is connected to a battery cell to be detected through a positive pressure branch pipe, and the negative pressure pipeline is connected to a battery cell to be detected through a negative pressure branch pipe, a positive pressure pipeline detection meter is installed on the positive pressure pipeline, and a negative pressure pipeline detection meter is installed on the negative pressure pipeline, wherein the positive pressure pipeline is connected to a battery cell to be detected through a negative pressure branch pipe, and the positive pressure pipeline is connected to a battery cell to be detected through a negative pressure branch pipe, wherein the positive pressure pipeline is connected to a positive pressure pipeline detection meter, and the negative pressure pipeline is connected to a negative pressure pipeline detection meter, wherein the positive pressure pipeline is connected to a negative pressure pipeline detection meter, and ... It also includes a driving cylinder, a test cylinder and a double-headed piston, the double-headed piston includes a driving piston head located in the driving cylinder and a test piston head located in the test cylinder; in the test cylinder, the two sides of the test piston head are respectively a positive pressure chamber and a negative pressure chamber, the positive pressure chamber is connected to the positive pressure pipeline, and the negative pressure chamber is connected to the negative pressure pipeline; in the driving cylinder, the two sides of the driving piston head are respectively an active control chamber and a reset control chamber, the active control chamber is provided with an active air port, the reset control chamber is provided with a reset air port, and the driving piston head is hard-connected with the test piston head in the test cylinder via a connecting shaft.

2. A battery air tightness rapid detection structure according to claim 1, characterized in that: A positive pressure regulating chamber and a positive pressure regulating piston for adjusting the size of the positive pressure regulating chamber are installed on the positive pressure pipeline.

3. A battery air tightness rapid detection structure according to claim 1, characterized in that: A negative pressure regulating chamber and a negative pressure regulating piston for adjusting the size of the negative pressure regulating chamber are installed on the negative pressure pipeline.

4. A battery air tightness rapid detection structure according to claim 2, characterized in that: A positive pressure regulating push rod and a positive pressure regulating spring are installed on the side of the positive pressure regulating piston facing away from the positive pressure regulating chamber.

5. A battery air tightness rapid detection structure according to claim 3, characterized in that: A negative pressure regulating push rod and a negative pressure regulating spring are mounted on the negative pressure regulating piston on the side facing away from the negative pressure regulating chamber.

6. A battery air tightness rapid detection structure according to claim 1, characterized in that: A limit block is provided on the part of the double-headed piston located between the test cylinder and the drive cylinder. A fixed first limit piece and a second limit piece are also installed between the test cylinder and the drive cylinder. The limit block is located between the first limit piece and the second limit piece.

7. A battery air tightness rapid detection structure according to any one of claims 1 to 6, characterized in that: Any two adjacent battery cells are connected to a positive pressure pipeline and a negative pressure pipeline respectively.

8. A method for rapid detection of battery air tightness, using the rapid detection structure of claim 1 for detection, characterized in that: The following steps are involved: ① Divide several battery cells to be tested into positive pressure test cells and negative pressure test cells to ensure that among any two adjacent battery cells, one is a positive pressure test cell and the other is a negative pressure test cell, and then connect the positive pressure branch pipe to the positive pressure test cell and the negative pressure branch pipe to the negative pressure test cell; ② Introduce gas into the active gas port, thereby controlling the driving piston head in the driving cylinder to move toward the test cylinder, so that the volume of the positive pressure chamber decreases and the volume of the negative pressure chamber increases, thereby forming a positive pressure relative to the original air pressure in the battery cell in the positive pressure chamber, and forming a negative pressure relative to the original air pressure in the battery cell in the negative pressure chamber; ③ Determine the sealing condition of the battery through the positive pressure pipeline test table and the negative pressure pipeline test table.

9. A method for rapid detection of battery air tightness according to claim 8, characterized in that: In step ②, the pressure value of the gas introduced into the active port is a fixed value. When testing batteries of different models, first adjust the size of the positive pressure regulating chamber and the negative pressure regulating chamber so that the readings on the positive pressure pipeline test gauge or the negative pressure pipeline test gauge are the same when the sealing of batteries of different models is qualified.

10. A method for rapid detection of battery air tightness according to claim 8, characterized in that: If the readings on the positive pressure pipeline test gauge or the negative pressure pipeline test gauge deviate from the standard value, the adjacent battery cells are tested in turn through a pair of positive pressure branch pipes and negative pressure branch pipes.

Images