CN116929667A - Bidirectional nondestructive air tightness detection device and method for battery pack - Google Patents
Bidirectional nondestructive air tightness detection device and method for battery pack Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 80
- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000009825 accumulation Methods 0.000 claims abstract description 209
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 36
- 230000009467 reduction Effects 0.000 claims description 14
- 238000011038 discontinuous diafiltration by volume reduction Methods 0.000 claims description 8
- 230000006835 compression Effects 0.000 claims description 6
- 238000007906 compression Methods 0.000 claims description 6
- 238000004590 computer program Methods 0.000 claims description 3
- 230000001066 destructive effect Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
Abstract
The application relates to the field of battery detection, in particular to a bidirectional nondestructive air tightness detection device and method for a battery pack, wherein the method comprises the following steps: placing the battery pack to be tested into a second pressure accumulation box and closing the box door; after closing the electromagnetic valve, starting the first air pump; when the first temporary air pressure is smaller than the lowest preset air pressure, the first air pump is closed; opening the electromagnetic valve; recording a first initial air pressure; maintaining the pressure for a period of time; recording a first detected air pressure; and evaluating the external leakage tightness of the battery pack to be tested by using the first detected air pressure. Opening a box door for pressure relief; after standing for a period of time, closing the box door; after closing the electromagnetic valve, starting the second air pump; when the second temporary air pressure is greater than the highest preset air pressure, the second air pump is closed; opening the electromagnetic valve; recording a second initial air pressure; maintaining the pressure for a period of time; recording a second detected air pressure; and evaluating the internal leakage tightness of the battery pack to be tested by using the second detected air pressure. The nondestructive detection of the external leakage air tightness and the internal leakage air tightness of the battery pack to be detected can be realized.
Description
Technical Field
The application relates to the field of battery detection, in particular to a bidirectional nondestructive air tightness detection device and method for a battery pack.
Background
The battery pack is a case structure in which a plurality of batteries are hermetically packed together, and strict sealing treatment is generally required for the battery pack in order to improve the operational stability of the batteries and to prevent leakage during the operation of the batteries.
In the prior art, in the tightness detection process of the battery pack, a certain amount of gas is filled into the battery pack, then the pressure is maintained for a period of time, and the sealing performance of the battery pack is evaluated by observing the air pressure drop in the battery pack.
Disclosure of Invention
In view of the above, a bidirectional nondestructive air tightness detection device and method for a battery pack are provided, so as to realize nondestructive air tightness test for the battery pack.
The application provides a bidirectional nondestructive air tightness detection method of a battery pack, which comprises the following steps:
placing the battery pack to be tested into a second pressure accumulation box and closing the box door;
after closing the electromagnetic valve, starting the first air pump to pump air from the first pressure accumulation box;
the air pressure sensor detects first temporary air pressure in the first pressure accumulation box, and when the first temporary air pressure is smaller than the lowest preset air pressure, the first air pump is closed;
opening the electromagnetic valve to enable the first pressure accumulation box to be communicated with the second pressure accumulation box;
the air pressure sensor detects a first initial air pressure in the first pressure accumulation box and records the first initial air pressure;
maintaining the pressure for a period of time, wherein the pressure maintaining time is the first pressure maintaining time;
when the first pressure keeping time length reaches a first preset time length, the air pressure sensor detects first detection air pressure in the first pressure accumulation box and records the first detection air pressure;
evaluating the external leakage tightness of the battery pack to be tested by using the first detection air pressure;
wherein, the air inlet of first air pump is through first pipeline and the inside intercommunication of first pressure accumulation case, installs first check valve on the first pipeline, and first check valve opens when first air pump is to first pressure accumulation case bleed, and air pressure sensor installs inside first pressure accumulation case, and first pressure accumulation case is through third pipeline and the inside intercommunication of second pressure accumulation case, and the solenoid valve is installed on the third pipeline.
In some embodiments of the above method for detecting bidirectional non-destructive air tightness of a battery pack, the method for detecting bidirectional non-destructive air tightness of a battery pack further comprises the steps of:
opening the box door to enable the second pressure accumulation box to be communicated with the atmosphere, and releasing pressure of the first pressure accumulation box and the second pressure accumulation box;
after standing for a period of time, closing the box door;
after closing the electromagnetic valve, starting a second air pump, and inputting compressed gas into the first pressure accumulation box;
the air pressure sensor detects second temporary air pressure in the first pressure accumulation box, and when the second temporary air pressure is larger than the highest preset air pressure, the second air pump is closed;
opening the electromagnetic valve to enable the first pressure accumulation box to be communicated with the second pressure accumulation box;
the air pressure sensor detects second initial air pressure in the first pressure accumulation box and records the second initial air pressure;
the pressure maintaining time is the second pressure maintaining time;
when the second pressure maintaining time length reaches a second preset time length, the air pressure sensor detects second detection air pressure in the first pressure accumulation box and records the second detection air pressure;
the internal leakage tightness of the battery pack to be tested is evaluated by the second detected air pressure,
the air outlet of the second air pump is communicated with the interior of the first pressure accumulation box through a second pipeline, a second one-way valve is arranged on the second pipeline, and the second one-way valve is opened when the second air pump inputs compressed air into the first pressure accumulation box.
In some embodiments of the bidirectional nondestructive air tightness detection method for the battery pack, before the battery pack to be detected is placed in the second pressure accumulation box, immersing the battery pack to be detected in a container filled with water, measuring the volume of overflowed water, taking the overflowed water volume as the volume of the battery pack to be detected, and airing the battery pack to be detected;
an expanded volume increment is obtained according to equation (1),
P A1 V 1 =P A2 (V 1 +V 2 -V-V A )（1），
in formula (1), P A1 Is a first temporary air pressure, V 1 Is the volume of the first pressure accumulation tank, P A2 Is the first initial air pressure, V 2 Is the volume of the second pressure accumulation boxProduct, V is the volume of the battery pack to be tested, V A The volume increment of the battery pack to be tested due to the expansion of the internal and external air pressure difference is shown;
obtaining the amount of boost that leaks according to equation (2),
P A2 (V 1 +V 2 -V-V A )=P A3 (V 1 +V 2 -V-V A )+P A （2），
in formula (2), V 1 Is the volume of the first pressure accumulation tank, P A2 Is the first initial air pressure, V 2 Is the volume of the second pressure accumulation box, V is the volume of the battery pack to be tested, V A Is the volume increment of expansion, P A3 Is the first detected air pressure, P A The pressure is increased by the leakage of the internal gas after the pressure of the battery pack to be tested is maintained, so that the pressure in the second pressure accumulation box is increased;
and evaluating the external leakage air tightness of the battery pack to be tested according to the external leakage pressure boost amount.
In some embodiments of the bidirectional nondestructive air tightness detection method for the battery pack, before the battery pack to be detected is placed in the second pressure accumulation box, immersing the battery pack to be detected in a container filled with water, measuring the volume of overflowed water, taking the overflowed water volume as the volume of the battery pack to be detected, and airing the battery pack to be detected;
a compressed volume reduction is obtained according to formula (3),
P B1 V 1 =P B2 (V 1 +V 2 -V+V B )（3），
in formula (3), P B1 Is a first temporary air pressure, V 1 Is the volume of the first pressure accumulation tank, P B2 Is the first initial air pressure, V 2 Is the volume of the second pressure accumulation box, V is the volume of the battery pack to be tested, V B The volume of the battery pack to be tested is reduced due to the internal and external air pressure difference;
obtaining the pressure reduction amount of internal leakage according to the formula (4),
P B2 (V 1 +V 2 -V-V B )=P B3 (V 1 +V 2 -V+V B )-P B （4），
in formula (4), V 1 Is a first pressure accumulationVolume of case, P B2 Is the first initial air pressure, V 2 Is the volume of the second pressure accumulation box, V is the volume of the battery pack to be tested, V B Is the volume increment of expansion, P B3 Is the first detected air pressure, P B The pressure of the battery pack to be tested is maintained, and then external air leaks to enable the air pressure in the second pressure accumulation box to rise by the pressure reduction amount of the leakage;
and evaluating the internal leakage tightness of the battery pack to be tested according to the leakage depressurization amount.
The application provides another bidirectional nondestructive air tightness detection method of a battery pack, which comprises the following steps:
placing the battery pack to be tested into a second pressure accumulation box and closing the box door;
after closing the electromagnetic valve, starting a second air pump, and inputting compressed gas into the first pressure accumulation box;
the air pressure sensor detects second temporary air pressure in the first pressure accumulation box, and when the second temporary air pressure is larger than the highest preset air pressure, the second air pump is closed;
opening the electromagnetic valve to enable the first pressure accumulation box to be communicated with the second pressure accumulation box;
the air pressure sensor detects second initial air pressure in the first pressure accumulation box and records the second initial air pressure;
the pressure maintaining time is the second pressure maintaining time;
when the second pressure maintaining time length reaches a second preset time length, the air pressure sensor detects second detection air pressure in the first pressure accumulation box and records the second detection air pressure;
evaluating the internal leakage tightness of the battery pack to be tested by using the second detection air pressure;
wherein, the gas outlet of second air pump passes through second pipeline and the inside intercommunication of first pressure accumulation case, installs the second check valve on the second pipeline, and the second check valve opens when the second air pump inputs compressed gas to first pressure accumulation incasement, and air pressure sensor installs inside first pressure accumulation case, and first pressure accumulation case passes through third pipeline and the inside intercommunication of second pressure accumulation case, and the solenoid valve is installed on the third pipeline.
In some embodiments of the above-described method for detecting bidirectional lossless gas tightness of another battery pack, the method for detecting bidirectional lossless gas tightness of a battery pack further includes the steps of:
opening the box door to enable the second pressure accumulation box to be communicated with the atmosphere, and releasing pressure of the first pressure accumulation box and the second pressure accumulation box;
after standing for a period of time, closing the box door;
after closing the electromagnetic valve, starting the first air pump to pump air from the first pressure accumulation box;
the air pressure sensor detects first temporary air pressure in the first pressure accumulation box, and when the first temporary air pressure is smaller than the lowest preset air pressure, the first air pump is closed;
opening the electromagnetic valve to enable the first pressure accumulation box to be communicated with the second pressure accumulation box;
the air pressure sensor detects a first initial air pressure in the first pressure accumulation box and records the first initial air pressure;
maintaining the pressure for a period of time, wherein the pressure maintaining time is the first pressure maintaining time;
when the first pressure keeping time length reaches a first preset time length, the air pressure sensor detects first detection air pressure in the first pressure accumulation box and records the first detection air pressure;
evaluating the external leakage tightness of the battery pack to be tested by using the first detection air pressure;
wherein, the air inlet of first air pump is through first pipeline and the inside intercommunication of first accumulator, installs first check valve on the first pipeline, and first check valve opens when first air pump is to first accumulator air bleed.
In some embodiments of the two-way nondestructive airtight detection method for another battery pack, before the battery pack to be detected is placed in the second pressure accumulation box, immersing the battery pack to be detected in a container filled with water, measuring the volume of overflowed water, taking the overflowed water volume as the volume of the battery pack to be detected, and airing the battery pack to be detected;
a compressed volume reduction is obtained according to formula (5),
P B1 V 1 =P B2 (V 1 +V 2 -V+V B )（5），
in formula (5), P B1 Is a first temporary air pressure, V 1 Is the volume of the first pressure accumulation tank, P B2 Is the first initial air pressure, V 2 Is the volume of the second pressure accumulation tankV is the volume of the battery pack to be tested, V B The volume of the battery pack to be tested is reduced due to the internal and external air pressure difference;
obtaining the pressure reduction amount of internal leakage according to the formula (6),
P B2 (V 1 +V 2 -V-V B )=P B3 (V 1 +V 2 -V+V B )-P B （6），
in formula (6), V 1 Is the volume of the first pressure accumulation tank, P B2 Is the first initial air pressure, V 2 Is the volume of the second pressure accumulation box, V is the volume of the battery pack to be tested, V B Is the volume increment of expansion, P B3 Is the first detected air pressure, P B The pressure of the battery pack to be tested is maintained, and then external air leaks to enable the air pressure in the second pressure accumulation box to rise by the pressure reduction amount of the leakage;
and evaluating the internal leakage tightness of the battery pack to be tested according to the leakage depressurization amount.
In some embodiments of the two-way nondestructive airtight detection method for another battery pack, before the battery pack to be detected is placed in the second pressure accumulation box, immersing the battery pack to be detected in a container filled with water, measuring the volume of overflowed water, taking the overflowed water volume as the volume of the battery pack to be detected, and airing the battery pack to be detected;
an expanded volume increment is obtained according to equation (7),
P A1 V 1 =P A2 (V 1 +V 2 -V-V A )（7），
in formula (7), P A1 Is a first temporary air pressure, V 1 Is the volume of the first pressure accumulation tank, P A2 Is the first initial air pressure, V 2 Is the volume of the second pressure accumulation box, V is the volume of the battery pack to be tested, V A The volume increment of the battery pack to be tested due to the expansion of the internal and external air pressure difference is shown;
obtaining the amount of boost that leaks according to equation (8),
P A2 (V 1 +V 2 -V-V A )=P A3 (V 1 +V 2 -V-V A )+P A （8），
in formula (8), V 1 Is the firstVolume of accumulator tank, P A2 Is the first initial air pressure, V 2 Is the volume of the second pressure accumulation box, V is the volume of the battery pack to be tested, V A Is the volume increment of expansion, P A3 Is the first detected air pressure, P A The pressure is increased by the leakage of the internal gas after the pressure of the battery pack to be tested is maintained, so that the pressure in the second pressure accumulation box is increased;
and evaluating the external leakage air tightness of the battery pack to be tested according to the external leakage pressure boost amount.
The application also provides a bidirectional nondestructive air tightness detection device of the battery pack, which is applied to the bidirectional nondestructive air tightness detection method of the battery pack, and comprises a first pressure accumulation box, a second pressure accumulation box and a first air pump, wherein the first pressure accumulation box is communicated with the second pressure accumulation box through a third pipeline, an electromagnetic valve is arranged on the third pipeline, an air inlet of the first air pump is communicated with the first pressure accumulation box through a first pipeline, a first one-way valve is arranged on the first pipeline, the first one-way valve is opened when the first air pump pumps air from the first pressure accumulation box, an air pressure sensor is arranged in the first pressure accumulation box, and a box door for opening or closing the second pressure accumulation box is arranged on the second pressure accumulation box;
the bidirectional nondestructive air tightness detection device of the battery pack further comprises a controller, wherein the controller is respectively connected with the first air pump, the air pressure sensor and the electromagnetic valve, the controller is used for controlling the first air pump and the electromagnetic valve to work and recording the air pressure detected by the air pressure sensor, the controller is provided with a processor and a memory, and a computer program is stored in the memory and is suitable for being executed by the processor to realize the bidirectional nondestructive air tightness detection method of the battery pack.
In some embodiments of the bidirectional nondestructive air tightness detection device for a battery pack, the bidirectional nondestructive air tightness detection device for a battery pack further comprises a second air pump, an air outlet of the second air pump is communicated with the first pressure accumulation box through a second pipeline, a second one-way valve is arranged on the second pipeline, and the second one-way valve is opened when the second air pump inputs compressed air into the first pressure accumulation box; the controller is also connected with the second air pump and used for controlling the second air pump to work.
ADVANTAGEOUS EFFECTS OF INVENTION
The method can carry out nondestructive detection on the external leakage and the internal leakage of the battery pack to be detected, and compared with the lossy external leakage test in the prior art, the method has the advantages that the test result is more comprehensive, and a leakage source is not increased; after the solenoid valve is opened, the air pressure in the first pressure accumulation box can be quickly consistent with the air pressure in the second pressure accumulation box, compared with the continuous pressurization in the battery pack in the prior art, the detection efficiency is higher, and the problem that the detection result is reduced due to leakage in the pressurization process is solved. And a sealing ring is adopted to seal between the box opening of the second pressure accumulation box and the box door.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features and aspects of the application and together with the description, serve to explain the principles of the application.
Fig. 1 is a schematic structural view of a bidirectional nondestructive air tightness detection device for a battery pack according to an embodiment of the present application.
Description of the reference numerals
100. A first accumulator tank; 102. a second accumulator tank; 104. a first air pump; 106. a third pipeline; 108. an electromagnetic valve; 110. a first pipeline; 112. a first one-way valve; 114. an air pressure sensor; 116. a door; 118. a second air pump; 120. a second pipeline; 122. a second one-way valve; 124. and (5) a battery pack to be tested.
Detailed Description
Various exemplary embodiments, features and aspects of the application will be described in detail below with reference to the drawings. In the drawings, like reference numbers indicate identical or functionally similar elements. Although various aspects of the embodiments are illustrated in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated. The word "exemplary" is used herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. In addition, for the purposes of better illustrating the application, it will be apparent to one skilled in the art that numerous specific details are set forth in the various embodiments that follow. The application may be practiced without some of these specific details. In some embodiments, methods, means and elements well known to those skilled in the art have not been described in detail in order to highlight the gist of the present application.
Various embodiments of the application are described below in conjunction with FIG. 1.
The embodiment 1 of the application provides a bidirectional nondestructive air tightness detection method of a battery pack, which comprises the following steps:
placing the battery pack 124 to be tested into the second pressure accumulation box 102 and closing the box door 116;
after the electromagnetic valve 108 is closed, the first air pump 104 is started to suck air from the first pressure accumulation box 100;
the air pressure sensor 114 detects a first temporary air pressure in the first accumulator 100, and turns off the first air pump 104 when the first temporary air pressure is less than a minimum preset air pressure;
opening the solenoid valve 108 to communicate the first and second pressure accumulation tanks 100 and 102;
the air pressure sensor 114 detects a first initial air pressure in the first accumulator 100 and records the first initial air pressure;
maintaining the pressure for a period of time, wherein the pressure maintaining time is the first pressure maintaining time;
when the first pressure maintaining period reaches a first preset period, the air pressure sensor 114 detects a first detected air pressure in the first accumulator 100 and records the first detected air pressure;
evaluating the external leakage tightness of the battery pack 124 to be measured with the first detected air pressure;
the air inlet of the first air pump 104 is communicated with the inside of the first pressure accumulation box 100 through a first pipeline 110, a first check valve 112 is installed on the first pipeline 110, the first check valve 112 is opened when the first air pump 104 pumps air to the first pressure accumulation box 100, an air pressure sensor 114 is installed inside the first pressure accumulation box 100, the first pressure accumulation box 100 is communicated with the second pressure accumulation box 102 through a third pipeline 106, and an electromagnetic valve 108 is installed on the third pipeline 106.
In some exemplary embodiments of example 1, the bidirectional non-destructive air tightness detection method of the battery pack further comprises the steps of:
the door 116 is opened to allow the second pressure accumulation tank 102 to communicate with the atmosphere, and the pressure of the first pressure accumulation tank 100 and the second pressure accumulation tank 102 is released;
after standing for a period of time, closing the door 116;
after the electromagnetic valve 108 is closed, the second air pump 118 is started, and compressed air is input into the first accumulator 100;
the air pressure sensor 114 detects a second temporary air pressure in the first accumulator 100, and turns off the second air pump 118 when the second temporary air pressure is greater than a maximum preset air pressure;
opening the solenoid valve 108 to communicate the first and second pressure accumulation tanks 100 and 102;
the air pressure sensor 114 detects a second initial air pressure in the first accumulator 100 and records the second initial air pressure;
the pressure maintaining time is the second pressure maintaining time;
when the second dwell time reaches a second preset time, the air pressure sensor 114 detects a second detected air pressure in the first accumulator 100 and records the second detected air pressure;
the internal leakage tightness of the battery pack 124 to be measured is evaluated with the second detected air pressure,
the air outlet of the second air pump 118 is communicated with the interior of the first pressure accumulation tank 100 through a second pipeline 120, a second one-way valve 122 is installed on the second pipeline 120, and the second one-way valve 122 is opened when the second air pump 118 inputs compressed air into the first pressure accumulation tank 100.
In some exemplary embodiments of example 1, before placing the battery pack 124 to be tested into the second pressure accumulation tank 102, immersing the battery pack 124 to be tested in a container filled with water, measuring the volume of overflowed water, taking the overflowed water volume as the volume of the battery pack 124 to be tested, and airing the battery pack 124 to be tested;
an expanded volume increment is obtained according to equation (1),
P A1 V 1 =P A2 (V 1 +V 2 -V-V A )（1），
in formula (1), P A1 Is a first temporary air pressure, V 1 Is the volume of the first accumulator 100，P A2 Is the first initial air pressure, V 2 Is the volume of the second accumulator tank 102, V is the volume of the battery pack 124 to be tested, V A Is the volume increment of the battery pack 124 to be tested due to the expansion of the internal and external air pressure difference;
obtaining the amount of boost that leaks according to equation (2),
P A2 (V 1 +V 2 -V-V A )=P A3 (V 1 +V 2 -V-V A )+P A （2），
in formula (2), V 1 Is the volume of the first accumulator 100, P A2 Is the first initial air pressure, V 2 Is the volume of the second accumulator tank 102, V is the volume of the battery pack 124 to be tested, V A Is the volume increment of expansion, P A3 Is the first detected air pressure, P A Is the pressure boost amount of the internal gas leakage of the battery pack 124 to be tested after pressure maintaining to increase the pressure in the second pressure accumulation tank 102;
the external leakage tightness of the battery pack 124 to be measured is evaluated based on the amount of the leaked boost.
In some exemplary embodiments of example 1, before placing the battery pack 124 to be tested into the second pressure accumulation tank 102, immersing the battery pack 124 to be tested in a container filled with water, measuring the volume of overflowed water, taking the overflowed water volume as the volume of the battery pack 124 to be tested, and airing the battery pack 124 to be tested;
a compressed volume reduction is obtained according to formula (3),
P B1 V 1 =P B2 (V 1 +V 2 -V+V B )（3），
in formula (3), P B1 Is a first temporary air pressure, V 1 Is the volume of the first accumulator 100, P B2 Is the first initial air pressure, V 2 Is the volume of the second accumulator tank 102, V is the volume of the battery pack 124 to be tested, V B The volume of the battery pack 124 to be tested is reduced due to the internal and external air pressure difference;
obtaining the pressure reduction amount of internal leakage according to the formula (4),
P B2 (V 1 +V 2 -V-V B )=P B3 (V 1 +V 2 -V+V B )-P B （4），
in formula (4), V 1 Is the volume of the first accumulator 100, P B2 Is the first initial air pressure, V 2 Is the volume of the second accumulator tank 102, V is the volume of the battery pack 124 to be tested, V B Is the volume increment of expansion, P B3 Is the first detected air pressure, P B Is the pressure reduction amount of the leakage of the external gas after the pressure of the battery pack 124 to be measured is maintained, so that the pressure in the second pressure accumulation tank 102 is increased;
the internal leakage tightness of the battery pack 124 to be measured was evaluated based on the amount of the leaked reduced pressure.
The embodiment 2 of the application provides a bidirectional nondestructive air tightness detection method of a battery pack, which comprises the following steps:
placing the battery pack 124 to be tested into the second pressure accumulation box 102 and closing the box door 116;
after the electromagnetic valve 108 is closed, the second air pump 118 is started, and compressed air is input into the first accumulator 100;
the air pressure sensor 114 detects a second temporary air pressure in the first accumulator 100, and turns off the second air pump 118 when the second temporary air pressure is greater than a maximum preset air pressure;
opening the solenoid valve 108 to communicate the first and second pressure accumulation tanks 100 and 102;
the air pressure sensor 114 detects a second initial air pressure in the first accumulator 100 and records the second initial air pressure;
the pressure maintaining time is the second pressure maintaining time;
when the second dwell time reaches a second preset time, the air pressure sensor 114 detects a second detected air pressure in the first accumulator 100 and records the second detected air pressure;
evaluating the internal leakage tightness of the battery pack 124 to be tested with the second detected air pressure;
the air outlet of the second air pump 118 is communicated with the interior of the first pressure accumulation tank 100 through a second pipeline 120, a second one-way valve 122 is installed on the second pipeline 120, the second one-way valve 122 is opened when the second air pump 118 inputs compressed air into the first pressure accumulation tank 100, the air pressure sensor 114 is installed in the first pressure accumulation tank 100, the first pressure accumulation tank 100 is communicated with the second pressure accumulation tank 102 through a third pipeline 106, and the electromagnetic valve 108 is installed on the third pipeline 106.
In some exemplary embodiments of example 2, the bidirectional non-destructive air tightness detection method of the battery pack further comprises the steps of:
the door 116 is opened to allow the second pressure accumulation tank 102 to communicate with the atmosphere, and the pressure of the first pressure accumulation tank 100 and the second pressure accumulation tank 102 is released;
after standing for a period of time, closing the door 116;
after the electromagnetic valve 108 is closed, the first air pump 104 is started to suck air from the first pressure accumulation box 100;
the air pressure sensor 114 detects a first temporary air pressure in the first accumulator 100, and turns off the first air pump 104 when the first temporary air pressure is less than a minimum preset air pressure;
opening the solenoid valve 108 to communicate the first and second pressure accumulation tanks 100 and 102;
the air pressure sensor 114 detects a first initial air pressure in the first accumulator 100 and records the first initial air pressure;
maintaining the pressure for a period of time, wherein the pressure maintaining time is the first pressure maintaining time;
when the first pressure maintaining period reaches a first preset period, the air pressure sensor 114 detects a first detected air pressure in the first accumulator 100 and records the first detected air pressure;
evaluating the external leakage tightness of the battery pack 124 to be measured with the first detected air pressure;
the air inlet of the first air pump 104 is communicated with the interior of the first pressure accumulation tank 100 through a first pipeline 110, a first check valve 112 is installed on the first pipeline 110, and the first check valve 112 is opened when the first air pump 104 pumps air into the first pressure accumulation tank 100.
In some exemplary embodiments of example 2, before placing the battery pack 124 to be tested into the second pressure accumulation tank 102, immersing the battery pack 124 to be tested in a container filled with water, measuring the volume of overflowed water, taking the overflowed water volume as the volume of the battery pack 124 to be tested, and airing the battery pack 124 to be tested;
a compressed volume reduction is obtained according to formula (5),
P B1 V 1 =P B2 (V 1 +V 2 -V+V B )（5），
in formula (5), P B1 Is a first temporary air pressure, V 1 Is the volume of the first accumulator 100, P B2 Is the first initial air pressure, V 2 Is the volume of the second accumulator tank 102, V is the volume of the battery pack 124 to be tested, V B The volume of the battery pack 124 to be tested is reduced due to the internal and external air pressure difference;
obtaining the pressure reduction amount of internal leakage according to the formula (6),
P B2 (V 1 +V 2 -V-V B )=P B3 (V 1 +V 2 -V+V B )-P B （6），
in formula (6), V 1 Is the volume of the first accumulator 100, P B2 Is the first initial air pressure, V 2 Is the volume of the second accumulator tank 102, V is the volume of the battery pack 124 to be tested, V B Is the volume increment of expansion, P B3 Is the first detected air pressure, P B Is the pressure reduction amount of the leakage of the external gas after the pressure of the battery pack 124 to be measured is maintained, so that the pressure in the second pressure accumulation tank 102 is increased;
the internal leakage tightness of the battery pack 124 to be measured was evaluated based on the amount of the leaked reduced pressure.
In some exemplary embodiments of example 2, before placing the battery pack 124 to be tested into the second pressure accumulation tank 102, immersing the battery pack 124 to be tested in a container filled with water, measuring the volume of overflowed water, taking the overflowed water volume as the volume of the battery pack 124 to be tested, and airing the battery pack 124 to be tested;
an expanded volume increment is obtained according to equation (7),
P A1 V 1 =P A2 (V 1 +V 2 -V-V A )（7），
in formula (7), P A1 Is a first temporary air pressure, V 1 Is the volume of the first accumulator 100, P A2 Is the first initial air pressure, V 2 Is the volume of the second accumulator tank 102, V is the volume of the battery pack 124 to be tested, V A Is the volume increment of the battery pack 124 to be tested due to the expansion of the internal and external air pressure difference;
obtaining the amount of boost that leaks according to equation (8),
P A2 (V 1 +V 2 -V-V A )=P A3 (V 1 +V 2 -V-V A )+P A （8），
in formula (8), V 1 Is the volume of the first accumulator 100, P A2 Is the first initial air pressure, V 2 Is the volume of the second accumulator tank 102, V is the volume of the battery pack 124 to be tested, V A Is the volume increment of expansion, P A3 Is the first detected air pressure, P A Is the pressure boost amount of the internal gas leakage of the battery pack 124 to be tested after pressure maintaining to increase the pressure in the second pressure accumulation tank 102;
the external leakage tightness of the battery pack 124 to be measured is evaluated based on the amount of the leaked boost.
The two-way nondestructive air tightness detection method for the battery pack provided by the embodiment 1 and the embodiment 2 can perform nondestructive detection on the external air tightness and the internal air tightness of the battery pack 124 to be detected, and compared with the lossy external air tightness test in the prior art, the two-way nondestructive air tightness detection method for the battery pack provided by the embodiment 1 and the embodiment 2 has more comprehensive test results and does not increase leakage sources; after the electromagnetic valve 108 is opened, the air pressure in the first pressure accumulation box 100 can quickly be consistent with the air pressure in the second pressure accumulation box 102, so that compared with the continuous pressurization to the battery pack in the prior art, the detection efficiency is higher, and the problem that the detection result is reduced due to leakage in the pressurization process is solved. The opening of the second pressure accumulation tank 102 is sealed with the tank door 116 by a sealing ring.
The embodiment 3 of the application provides a bidirectional nondestructive air tightness detection device of a battery pack, which is applied to the bidirectional nondestructive air tightness detection method of the battery pack, and comprises a first pressure accumulation box 100, a second pressure accumulation box 102 and a first air pump 104, wherein the first pressure accumulation box 100 is communicated with the second pressure accumulation box 102 through a third pipeline 106, an electromagnetic valve 108 is arranged on the third pipeline 106, an air inlet of the first air pump 104 is communicated with the first pressure accumulation box 100 through a first pipeline 110, a first one-way valve 112 is arranged on the first pipeline 110, the first one-way valve 112 is opened when the first air pump 104 pumps air out of the first pressure accumulation box 100, an air pressure sensor 114 is arranged in the first pressure accumulation box 100, and a box door 116 for opening or closing the second pressure accumulation box 102 is arranged on the second pressure accumulation box 102;
the bidirectional nondestructive air tightness detection device of the battery pack further comprises a controller which is respectively connected with the first air pump 104, the air pressure sensor 114 and the electromagnetic valve 108, wherein the controller is used for controlling the first air pump 104 and the electromagnetic valve 108 to work and recording the air pressure detected by the air pressure sensor 114, and is provided with a processor and a memory, wherein a computer program is stored in the memory and is suitable for being executed by the processor to realize the bidirectional nondestructive air tightness detection method of the battery pack.
In some exemplary embodiments of example 3, the bidirectional nondestructive air tightness detection device of the battery pack further includes a second air pump 118, an air outlet of the second air pump 118 is communicated with the first pressure accumulation tank 100 through a second pipe 120, a second check valve 122 is installed on the second pipe 120, and the second check valve 122 is opened when the second air pump 118 inputs compressed air into the first pressure accumulation tank 100; the controller is also connected to the second air pump 118 for controlling the operation of the second air pump 118.
The bidirectional nondestructive air tightness detection device for the battery pack provided by the embodiment 3 of the application is operated according to the bidirectional nondestructive air tightness detection methods for the battery pack provided by the embodiments 1 and 2, so that nondestructive detection is carried out on the external leakage air tightness and the internal leakage air tightness of the battery pack 124 to be detected, the test result is more comprehensive, a leakage source is not increased, the detection efficiency is improved, and the problem that the detection result is reduced due to leakage in the pressurizing process is solved. The preset values (including the lowest preset air pressure, the first preset time period, the highest preset air pressure, and the second preset time period), the detection values (including the first temporary air pressure, the first initial air pressure, the first detection air pressure, the second temporary air pressure, the second initial air pressure, and the second detection air pressure), the preset parameters (including the volume of the first accumulator tank 100, the volume of the second accumulator tank 102, and the volume of the battery pack 124 to be tested), and the calculation results (including the volume reduction of compression, the pressure reduction of internal leakage, the volume increase of expansion, and the pressure increase of external leakage) are stored in the memory (the controller adopts the PLC controller). The volume increase of expansion and the volume decrease of compression have an influence on the evaluation result, and examples 1 and 2 detect and calculate the volume decrease of compression and the volume increase of expansion, fromAnd the influence caused by the volume reduction of compression and the volume increment of expansion is eliminated, and the reliability of the evaluation result is improved. The smaller the pressure reduction amount of internal leakage, the higher the internal leakage air tightness, and the smaller the pressure increase amount of external leakage, the higher the external leakage air tightness. The lowest preset air pressure in the embodiment of the application is 0.5 megapascals, the first preset time period is 10 minutes, the highest preset air pressure is 1.5 megapascals, and the second preset time period is 20 minutes. The volume of the first pressure accumulation tank 100 is 1.8 cubic meters, the volume of the second pressure accumulation tank 102 is equal to the volume of the first pressure accumulation tank 100, the volume of the battery packs 124 to be measured is about 0.6 cubic meters, the volumes of the battery packs 124 to be measured are different, and small differences exist, and the specific values are determined according to the volumes measured by the drainage method each time. The preset values and preset parameters of the present application are only used as reference examples, and the specific values relate to the test strength and the specification and type of the battery pack. In the relation of example 1 and example 2, V A And V B The first pressure accumulation tank 100 and the second pressure accumulation tank 102 are unchanged before and after being communicated, because the internal leakage amount and the external leakage amount of the battery pack 124 to be tested are smaller, the pressure difference between the internal and the external of the battery pack 124 to be tested is insufficient to enable the shell of the battery pack 124 to be tested to rebound and reset, or the rebound and reset amount is smaller and can be ignored. It should be appreciated that in order to facilitate the observation of the data during the test by the staff, the data output of the controller may be connected to a computer or display so that the data during the test is displayed on the computer or display.
The foregoing description of embodiments of the application has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the improvement of technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (10)
1. The bidirectional nondestructive air tightness detection method for the battery pack is characterized by comprising the following steps of:
placing the battery pack (124) to be tested into the second pressure accumulation box (102) and then closing the box door (116);
after the electromagnetic valve (108) is closed, the first air pump (104) is started to suck air from the first pressure accumulation box (100);
the air pressure sensor (114) detects a first temporary air pressure in the first pressure accumulation box (100), and when the first temporary air pressure is smaller than the lowest preset air pressure, the first air pump (104) is closed;
opening the electromagnetic valve (108) to enable the first pressure accumulation box (100) to be communicated with the second pressure accumulation box (102);
the air pressure sensor (114) detects a first initial air pressure in the first pressure accumulation box (100) and records the first initial air pressure;
maintaining the pressure for a period of time, wherein the pressure maintaining time is the first pressure maintaining time;
when the first pressure keeping time length reaches a first preset time length, the air pressure sensor (114) detects first detection air pressure in the first pressure accumulation box (100) and records the first detection air pressure;
evaluating the external leakage tightness of the battery pack (124) to be tested with the first detected air pressure;
wherein, the air inlet of first air pump (104) is through first pipeline (110) and the inside intercommunication of first pressure accumulation case (100), install first check valve (112) on first pipeline (110), first check valve (112) are opened when first air pump (104) is to first pressure accumulation case (100) bleed, air pressure sensor (114) are installed inside first pressure accumulation case (100), first pressure accumulation case (100) are through third pipeline (106) and the inside intercommunication of second pressure accumulation case (102), solenoid valve (108) are installed on third pipeline (106).
2. The method for bidirectional nondestructive air tightness detection of a battery pack according to claim 1, wherein the method for bidirectional nondestructive air tightness detection of a battery pack further comprises the steps of:
opening the door (116) to allow the second pressure accumulation tank (102) to communicate with the atmosphere, and releasing the pressure of the first pressure accumulation tank (100) and the second pressure accumulation tank (102);
closing the door (116) after standing for a period of time;
after the electromagnetic valve (108) is closed, the second air pump (118) is started, and compressed air is input into the first pressure accumulation box (100);
the air pressure sensor (114) detects a second temporary air pressure in the first pressure accumulation box (100), and when the second temporary air pressure is larger than the highest preset air pressure, the second air pump (118) is closed;
opening the electromagnetic valve (108) to enable the first pressure accumulation box (100) to be communicated with the second pressure accumulation box (102);
the air pressure sensor (114) detects a second initial air pressure in the first pressure accumulation box (100) and records the second initial air pressure;
the pressure maintaining time is the second pressure maintaining time;
when the second pressure maintaining time length reaches a second preset time length, the air pressure sensor (114) detects second detection air pressure in the first pressure accumulation box (100) and records the second detection air pressure;
evaluating the internal leakage tightness of the battery pack (124) to be tested with the second detected air pressure,
the air outlet of the second air pump (118) is communicated with the interior of the first pressure accumulation box (100) through a second pipeline (120), a second one-way valve (122) is arranged on the second pipeline (120), and the second one-way valve (122) is opened when the second air pump (118) inputs compressed air into the first pressure accumulation box (100).
3. The method for bidirectional nondestructive air tightness detection of a battery pack according to claim 1 or 2, characterized in that before the battery pack (124) to be detected is put into the second pressure accumulation tank (102), the battery pack (124) to be detected is immersed in a container filled with water, the volume of overflowed water is measured, the volume of overflowed water is taken as the volume of the battery pack (124) to be detected, and the battery pack (124) to be detected is dried;
an expanded volume increment is obtained according to equation (1),
P A1 V 1 =P A2 (V 1 +V 2 -V-V A )（1），
in formula (1), P A1 Is a first temporary air pressure, V 1 Is the volume of the first accumulator (100), P A2 Is the first initial air pressure, V 2 Is the volume of the second pressure accumulation box (102), V is the volume of the battery pack (124) to be tested, V A Is the volume increment of the battery pack (124) to be tested due to the expansion of the internal and external air pressure difference;
obtaining the amount of boost that leaks according to equation (2),
P A2 (V 1 +V 2 -V-V A )=P A3 (V 1 +V 2 -V-V A )+P A （2），
in formula (2), V 1 Is the volume of the first accumulator (100), P A2 Is the first initial air pressure, V 2 Is the volume of the second pressure accumulation box (102), V is the volume of the battery pack (124) to be tested, V A Is the volume increment of expansion, P A3 Is the first detected air pressure, P A The pressure is increased by the leakage of the internal gas after the pressure of the battery pack (124) to be tested is maintained, so that the internal gas pressure of the second pressure accumulation box (102) is increased;
and evaluating the leakage tightness of the battery pack (124) to be tested according to the leakage pressurizing amount.
4. The method for bidirectional nondestructive air tightness detection of a battery pack according to claim 2, wherein before the battery pack (124) to be detected is placed in the second pressure accumulation tank (102), the battery pack (124) to be detected is immersed in a container filled with water, the volume of overflowed water is measured, the volume of overflowed water is taken as the volume of the battery pack (124) to be detected, and the battery pack (124) to be detected is dried;
a compressed volume reduction is obtained according to formula (3),
P B1 V 1 =P B2 (V 1 +V 2 -V+V B )（3），
in formula (3), P B1 Is a first temporary air pressure, V 1 Is the volume of the first accumulator (100), P B2 Is the first initial air pressure, V 2 Is the volume of the second pressure accumulation tank (102)The product, V, is the volume of the battery pack (124) to be tested, V B The volume of the battery pack (124) to be tested is reduced due to the compression of the internal and external air pressure difference;
obtaining the pressure reduction amount of internal leakage according to the formula (4),
P B2 (V 1 +V 2 -V-V B )=P B3 (V 1 +V 2 -V+V B )-P B （4），
in formula (4), V 1 Is the volume of the first accumulator (100), P B2 Is the first initial air pressure, V 2 Is the volume of the second pressure accumulation box (102), V is the volume of the battery pack (124) to be tested, V B Is the volume increment of expansion, P B3 Is the first detected air pressure, P B The pressure of the battery pack (124) to be tested is maintained, and then external air leaks to enable the pressure in the second pressure accumulation box (102) to rise by the pressure reduction of the leakage;
and evaluating the internal leakage tightness of the battery pack (124) to be tested according to the leakage depressurization amount.
5. The bidirectional nondestructive air tightness detection method for the battery pack is characterized by comprising the following steps of:
placing the battery pack (124) to be tested into the second pressure accumulation box (102) and then closing the box door (116);
after the electromagnetic valve (108) is closed, the second air pump (118) is started, and compressed air is input into the first pressure accumulation box (100);
the air pressure sensor (114) detects a second temporary air pressure in the first pressure accumulation box (100), and when the second temporary air pressure is larger than the highest preset air pressure, the second air pump (118) is closed;
opening the electromagnetic valve (108) to enable the first pressure accumulation box (100) to be communicated with the second pressure accumulation box (102);
the air pressure sensor (114) detects a second initial air pressure in the first pressure accumulation box (100) and records the second initial air pressure;
the pressure maintaining time is the second pressure maintaining time;
when the second pressure maintaining time length reaches a second preset time length, the air pressure sensor (114) detects second detection air pressure in the first pressure accumulation box (100) and records the second detection air pressure;
evaluating the internal leakage tightness of the battery pack (124) to be tested with the second detected air pressure;
wherein, the gas outlet of second air pump (118) is through second pipeline (120) and the inside intercommunication of first pressure accumulation case (100), install second check valve (122) on second pipeline (120), second check valve (122) open when second air pump (118) are to the compressed gas of first pressure accumulation case (100) in input, air pressure sensor (114) are installed inside first pressure accumulation case (100), first pressure accumulation case (100) are through third pipeline (106) and second pressure accumulation case (102) intercommunication, solenoid valve (108) are installed on third pipeline (106).
6. The method for bidirectional nondestructive air tightness detection of battery pack according to claim 5, wherein the method for bidirectional nondestructive air tightness detection of battery pack further comprises the steps of:
opening the door (116) to allow the second pressure accumulation tank (102) to communicate with the atmosphere, and releasing the pressure of the first pressure accumulation tank (100) and the second pressure accumulation tank (102);
closing the door (116) after standing for a period of time;
after the electromagnetic valve (108) is closed, the first air pump (104) is started to suck air from the first pressure accumulation box (100);
the air pressure sensor (114) detects a first temporary air pressure in the first pressure accumulation box (100), and when the first temporary air pressure is smaller than the lowest preset air pressure, the first air pump (104) is closed;
opening the electromagnetic valve (108) to enable the first pressure accumulation box (100) to be communicated with the second pressure accumulation box (102);
the air pressure sensor (114) detects a first initial air pressure in the first pressure accumulation box (100) and records the first initial air pressure;
maintaining the pressure for a period of time, wherein the pressure maintaining time is the first pressure maintaining time;
when the first pressure keeping time length reaches a first preset time length, the air pressure sensor (114) detects first detection air pressure in the first pressure accumulation box (100) and records the first detection air pressure;
evaluating the external leakage tightness of the battery pack (124) to be tested with the first detected air pressure;
the air inlet of the first air pump (104) is communicated with the inside of the first pressure accumulation box (100) through a first pipeline (110), a first one-way valve (112) is arranged on the first pipeline (110), and the first one-way valve (112) is opened when the first air pump (104) pumps air to the first pressure accumulation box (100).
7. The method for bidirectional nondestructive air tightness detection of a battery pack according to claim 5, wherein before the battery pack (124) to be detected is placed in the second pressure accumulation tank (102), the battery pack (124) to be detected is immersed in a container filled with water, the volume of overflowed water is measured, the volume of overflowed water is taken as the volume of the battery pack (124) to be detected, and the battery pack (124) to be detected is dried;
a compressed volume reduction is obtained according to formula (5),
P B1 V 1 =P B2 (V 1 +V 2 -V+V B )（5），
in formula (5), P B1 Is a first temporary air pressure, V 1 Is the volume of the first accumulator (100), P B2 Is the first initial air pressure, V 2 Is the volume of the second pressure accumulation box (102), V is the volume of the battery pack (124) to be tested, V B The volume of the battery pack (124) to be tested is reduced due to the compression of the internal and external air pressure difference;
obtaining the pressure reduction amount of internal leakage according to the formula (6),
P B2 (V 1 +V 2 -V-V B )=P B3 (V 1 +V 2 -V+V B )-P B （6），
in formula (6), V 1 Is the volume of the first accumulator (100), P B2 Is the first initial air pressure, V 2 Is the volume of the second pressure accumulation box (102), V is the volume of the battery pack (124) to be tested, V B Is the volume increment of expansion, P B3 Is the first detected air pressure, P B Is a battery pack to be tested (124)The pressure is maintained, and then the external air leaks to enable the internal air pressure of the second pressure accumulation box (102) to rise by the pressure reduction amount of the leakage;
and evaluating the internal leakage tightness of the battery pack (124) to be tested according to the leakage depressurization amount.
8. The method for bidirectional nondestructive air tightness detection of a battery pack according to claim 6, wherein before the battery pack (124) to be detected is placed in the second pressure accumulation tank (102), the battery pack (124) to be detected is immersed in a container filled with water, the volume of overflowed water is measured, the volume of overflowed water is taken as the volume of the battery pack (124) to be detected, and the battery pack (124) to be detected is dried;
an expanded volume increment is obtained according to equation (7),
P A1 V 1 =P A2 (V 1 +V 2 -V-V A )（7），
in formula (7), P A1 Is a first temporary air pressure, V 1 Is the volume of the first accumulator (100), P A2 Is the first initial air pressure, V 2 Is the volume of the second pressure accumulation box (102), V is the volume of the battery pack (124) to be tested, V A Is the volume increment of the battery pack (124) to be tested due to the expansion of the internal and external air pressure difference;
obtaining the amount of boost that leaks according to equation (8),
P A2 (V 1 +V 2 -V-V A )=P A3 (V 1 +V 2 -V-V A )+P A （8），
in formula (8), V 1 Is the volume of the first accumulator (100), P A2 Is the first initial air pressure, V 2 Is the volume of the second pressure accumulation box (102), V is the volume of the battery pack (124) to be tested, V A Is the volume increment of expansion, P A3 Is the first detected air pressure, P A The pressure is increased by the leakage of the internal gas after the pressure of the battery pack (124) to be tested is maintained, so that the internal gas pressure of the second pressure accumulation box (102) is increased;
and evaluating the leakage tightness of the battery pack (124) to be tested according to the leakage pressurizing amount.
9. The bidirectional nondestructive air tightness detection device for the battery pack is applied to the bidirectional nondestructive air tightness detection method for the battery pack according to any one of claims 1 to 8, and is characterized by comprising a first pressure accumulation box (100), a second pressure accumulation box (102) and a first air pump (104), wherein the first pressure accumulation box (100) is communicated with the second pressure accumulation box (102) through a third pipeline (106), an electromagnetic valve (108) is installed on the third pipeline (106), an air inlet of the first air pump (104) is communicated with the first pressure accumulation box (100) through a first pipeline (110), a first one-way valve (112) is installed on the first pipeline (110), the first one-way valve (112) is opened when the first air pump (104) pumps air to the first pressure accumulation box (100), an air pressure sensor (114) is arranged in the first pressure accumulation box (100), and a box door (116) for opening or closing the second pressure accumulation box (102) is arranged on the second pressure accumulation box (102);
the bidirectional nondestructive air tightness detection device of the battery pack further comprises a controller, wherein the controller is respectively connected with the first air pump (104), the air pressure sensor (114) and the electromagnetic valve (108), the controller is used for controlling the first air pump (104) and the electromagnetic valve (108) to work and recording the air pressure detected by the air pressure sensor (114), the controller is provided with a processor and a memory, and a computer program is stored in the memory and is suitable for being executed by the processor to realize the bidirectional nondestructive air tightness detection method of the battery pack.
10. The device for detecting the bidirectional nondestructive air tightness of the battery pack according to claim 9, further comprising a second air pump (118), wherein an air outlet of the second air pump (118) is communicated with the first pressure accumulation tank (100) through a second pipeline (120), a second one-way valve (122) is arranged on the second pipeline (120), and the second one-way valve (122) is opened when the second air pump (118) inputs compressed air into the first pressure accumulation tank (100); the controller is also connected with the second air pump (118) and is used for controlling the second air pump (118) to work.
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