Calibration tool and calibration equipment

Abstract

The utility model discloses a calibration tool and calibration equipment, the calibration tool is used for testing opening pressure calibration of an explosion-proof valve of a battery pack, the calibration tool comprises a containing cavity with an opening and a liquid injection port, the liquid injection port is communicated with the containing cavity, and the liquid injection port is communicated with the containing cavity. The opening end of the calibration tool is connected with the box body of the tested battery pack, and the explosion-proof valve is accommodated in the accommodating chamber. The structural arrangement of the calibration tool provides technical support for calibrating the lower limit value of the opening pressure of the explosion-proof valve in combination with actual vehicle conditions. The calibration equipment can calibrate the lower limit value of the opening pressure of the explosion-proof valve in combination with the actual vehicle condition through the arrangement of the calibration tool, and provides conditions for the safety and reliability of the battery pack in the actual vehicle running process.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a calibration fixture for calibrating the opening pressure of an explosion-proof valve, and also to a calibration device including the aforementioned calibration fixture. Background Technology

[0002] The battery pack casing is equipped with an explosion-proof valve. In the event of thermal runaway in a battery cell, the explosion-proof valve opens to rapidly release pressure from the battery pack. As a key component for opening and releasing pressure during thermal runaway, the selection of the opening pressure parameter for the explosion-proof valve is crucial. A common type of explosion-proof valve is the spring-loaded explosion-proof valve, and its opening pressure can be designed by adjusting the stiffness of the spring.

[0003] Currently, the design of the opening pressure of explosion-proof valves mainly relies on theoretical calculations, primarily considering the ability to withstand burst pressure and the battery pack's tolerance. However, it doesn't account for scenarios where actual driving conditions might cause the valve to open accidentally. During electric vehicle operation, if the explosion-proof valve is subjected to acceleration in the same direction as its opening, it may open accidentally. Alternatively, rapid pressure changes within the battery pack due to vehicle movement could cause the internal and external pressure differences to exceed the valve's opening pressure, leading to accidental opening. Therefore, setting the lower limit of the explosion-proof valve's opening pressure too low increases the probability of accidental opening, potentially compromising the battery pack's sealing performance.

[0004] Therefore, how to calibrate the lower limit of the opening pressure of the explosion-proof valve in combination with actual driving conditions is a technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0005] The purpose of this application is to provide a calibration fixture and calibration equipment. The calibration fixture is designed to provide technical support for calibrating the lower limit of the opening pressure of the explosion-proof valve in conjunction with actual vehicle conditions. The calibration equipment, through the configuration of the calibration fixture, can calibrate the lower limit of the opening pressure of the explosion-proof valve in conjunction with actual vehicle conditions, thus ensuring the safety and reliability of the battery pack during actual vehicle operation.

[0006] To address the aforementioned technical problems, this application provides a calibration fixture for calibrating the opening pressure of an explosion-proof valve in a battery pack. The calibration fixture includes an open receiving chamber and a liquid injection port. The liquid injection port is connected to the receiving chamber. The open end of the calibration fixture is connected to the housing of the test battery pack. The receiving chamber houses the explosion-proof valve.

[0007] In one feasible embodiment, at least a portion of the wall panel of the calibration fixture is a transparent panel.

[0008] In one feasible embodiment, the transparent plate and the opening are located at opposite ends of the calibration fixture.

[0009] In one feasible embodiment, the calibration fixture includes a cover body, which includes a cover shell and a cover end cap. The cover shell has a cavity with openings at both ends. One end opening of the cover shell is arranged opposite to the other end opening of the cover shell. The cover end cap is connected to the cover shell and blocks one end opening of the cover shell, while the other end opening of the cover shell forms the opening. The cover end cap is the transparent plate.

[0010] In one feasible embodiment, the housing and the end cap are separate components, with the end cap being sealed to the housing.

[0011] In one feasible embodiment, the end of the calibration fixture where the opening is located is provided with a first flange connection plate, which is sealed to the housing.

[0012] In one feasible embodiment, the calibration fixture includes an injection tube, one end of which is connected to the receiving chamber, and the other end of which forms the injection port.

[0013] In one feasible embodiment, the injection tube includes a first tube segment and a second tube segment, wherein the extension direction of the first tube segment intersects the extension direction of the second tube segment.

[0014] In one feasible embodiment, the calibration fixture includes a cover body having the receiving chamber, a wall panel of the cover body having a plurality of filter holes, and the injection tube communicating with the receiving chamber through the filter holes.

[0015] In one feasible embodiment, the calibration fixture includes a cover body connected to a wall panel having the filter holes, the cover body and the wall panel having the filter holes forming a transition chamber, and the injection tube being inserted into the cover body.

[0016] In one feasible embodiment, the cover body includes a second flange connection plate, which is sealed to a wall panel having the filter holes.

[0017] This application embodiment also provides a calibration device, including a test battery pack, a vibration test bench, and a calibration fixture. The calibration fixture is any of the calibration fixtures described above. The calibration fixture is connected to the housing of the test battery pack. An explosion-proof valve installed in the housing is located in the receiving chamber. The test battery pack is installed on the vibration test bench.

[0018] The calibration fixture provided in this application is used to calibrate the opening pressure of the explosion-proof valve of a battery pack. It can calibrate the minimum opening pressure of the explosion-proof valve. In use, the calibration fixture can be combined with a test battery pack and a vibration test bench for calibration tests. During the calibration test, the calibration fixture is installed in the battery pack housing. The housing seals the housing's accommodating chamber to form a sealed space. The explosion-proof valve is located within this sealed space. Liquid is injected into the accommodating chamber, and a vibration and impact test is performed on the vibration test bench. Afterwards, the battery pack housing can be disassembled, and the presence of liquid entering the battery pack can be observed to determine whether the opening pressure value of the explosion-proof valve meets the actual operating requirements of the vehicle. This allows for the determination of the minimum opening pressure of the explosion-proof valve, preventing accidental opening during vehicle operation due to insufficient opening pressure. It also prevents foreign objects from entering the battery pack, which could lead to insulation failure or short circuits, ensuring the safety and reliability of the battery pack during electric vehicle operation. The calibration fixture has a simple structure and can be combined with vibration and impact tests on the battery pack, making implementation simple. Attached Figure Description

[0019] Figure 1 This is a structural diagram of a calibration fixture provided in one embodiment of this application;

[0020] Figure 2 for Figure 1 Exploded view of the calibration fixture shown;

[0021] Figure 3 This is an exploded view of a calibration device according to an embodiment of this application;

[0022] Figure 4 This is a structural diagram of a calibration device according to an embodiment of this application;

[0023] Figure 5 for Figure 4 A magnified view of part A in the middle;

[0024] Figure 6 for Figure 2 Structural diagram of the middle casing;

[0025] Figure 7 for Figure 2 Structural diagram of the middle cover body;

[0026] Figure 8 for Figure 7 Cross-sectional view along the BB direction.

[0027] Explanation of reference numerals in the attached figures:

[0028] The fixture 100 includes a receiving chamber 101, an opening 102, a liquid injection port 103, a filter hole 104, a cover body 110, a cover shell 111, a first wall plate 1111, a second wall plate 1112, a third wall plate 1113, a fourth wall plate 1114, a first flange connecting plate 1115, a cover end cap 112, a cover body 120, a second flange connecting plate 121, a liquid injection pipe 130, a first pipe section 131, and a second pipe section 132.

[0029] Test battery pack 200, enclosure 210, enclosure side wall 211, explosion-proof valve 220. Detailed Implementation

[0030] There are two main factors that cause the explosion-proof valve installed on the battery pack to open accidentally during the operation of an electric vehicle. One is that the explosion-proof valve is accidentally opened due to acceleration in the same direction as the opening direction. The other is that the rapid change in air pressure inside the battery pack caused by the electric vehicle's movement causes the pressure difference between the inside and outside of the battery pack to exceed the opening pressure of the explosion-proof valve, resulting in its accidental opening. Research has shown that both of these factors are caused by the vibration and impact that the battery pack experiences during vehicle operation.

[0031] The present application provides a calibration fixture and calibration equipment, which can be used to calibrate the opening pressure of the explosion-proof valve of the battery pack, so that the lower limit of the opening pressure of the explosion-proof valve can prevent the explosion-proof valve from being opened accidentally during the operation of the electric vehicle, thus ensuring the safety and reliability of the battery pack.

[0032] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] For ease of understanding and concise description, the following explanation will be combined with the calibration fixtures and equipment, and the beneficial effects will not be repeated.

[0034] Please refer to Figures 1 to 5 , Figure 1 This is a structural diagram of a calibration fixture provided in one embodiment of this application. Figure 2 for Figure 1 The exploded view of the calibration fixture shown. Figure 3 This is an exploded view of a calibration device according to an embodiment of this application. Figure 4 This is a structural diagram of a calibration device according to an embodiment of this application. Figure 5 for Figure 4 A magnified view of part A in the middle.

[0035] This embodiment provides a calibration fixture 100 for calibrating the opening pressure of the explosion-proof valve of a battery pack. The explosion-proof valve is installed on the battery housing of the battery pack, and can open to release pressure in the event of thermal runaway of the battery cells inside the battery housing.

[0036] This embodiment provides a calibration device, which includes a calibration fixture 100 and a test battery pack 200. An explosion-proof valve 220 is installed on the housing 210 of the test battery pack 200. Typically, the explosion-proof valve 220 is installed on one side wall 211 of the housing 210. The calibration device also includes a vibration test bench, on which the test battery pack 200 can be mounted for vibration and shock testing.

[0037] The calibration fixture 100 includes a receiving chamber 101 with an opening 102 and an injection port 103. The injection port 103 and the receiving chamber 101 are connected. The end of the calibration fixture 100 with the opening 102 is used to connect to the housing 210 of the test battery pack 200. The receiving chamber 101 is used to receive the explosion-proof valve 220.

[0038] The calibration procedure for the explosion-proof valve 220 using the aforementioned calibration fixture 100 is as follows:

[0039] First, select the opening pressure value of the explosion-proof valve 220, and then install the explosion-proof valve 220 with the corresponding opening pressure value on the housing 210 of the test battery pack 200.

[0040] Next, the calibration fixture 100 is installed on the test battery pack 200. The end of the calibration fixture 100 with its opening 102 is connected to the side wall 211 of the housing 210, so that the explosion-proof valve 220 installed on the side wall 211 is covered in the receiving chamber 101. After the calibration fixture 100 is connected to the side wall 211, the side wall 211 seals the opening 102 of the receiving chamber 101, forming a sealed space between the side wall 211 and the calibration fixture 100, within which the explosion-proof valve 220 is located. Liquid is injected into the receiving chamber 101 through the injection port 103 of the calibration fixture 100. It can be understood that the injected liquid is stored in the aforementioned sealed space.

[0041] Then, the battery pack 200 is mounted on a vibration test bench for vibration and shock testing. The vibration and shock test is a traditional vibration and shock test for the entire battery pack, and the test standards can refer to relevant national standards, group standards, or enterprise standards.

[0042] Finally, after the vibration and shock test, the casing 210 of the test battery pack 200 is opened for inspection. Observe whether any liquid has entered the test battery pack 200. If no liquid enters, it means that the explosion-proof valve 220 is open correctly and the current opening pressure value can meet the opening pressure requirements of the explosion-proof valve 220. If liquid enters, it means that the explosion-proof valve 220 has been opened incorrectly and the current opening pressure value of the explosion-proof valve 220 cannot meet the actual operating requirements of the vehicle. The opening pressure value of the explosion-proof valve 220 needs to be increased. After increasing the opening pressure value of the explosion-proof valve 220, the test is repeated.

[0043] As shown above, the minimum opening pressure of the explosion-proof valve 220 can be determined through multiple tests.

[0044] For example, if the opening pressure of the explosion-proof valve 220 is set to 3 kPa during the first test, and liquid enters the casing 210 of the test battery pack 200 after the first test, the opening pressure of the explosion-proof valve 220 can be gradually increased, for example, by 0.2 kPa each time, and then the test can be repeated. If, after the test, liquid enters the casing 210 of the test battery pack 200 when the opening pressure of the explosion-proof valve 220 is increased to 3.6 kPa, and after the test, no liquid enters the casing 210 of the test battery pack 200 when the opening pressure of the explosion-proof valve 220 is 3.8 kPa, then the minimum opening pressure of the explosion-proof valve 220 can be set to 3.8 kPa. Of course, different opening pressure values ​​can still be selected between 3.6 kPa and 3.8 kPa for testing to determine the relatively minimum opening pressure value.

[0045] For example, if the opening pressure of the explosion-proof valve 220 is set to 4 kPa during the first test, and no liquid enters the casing 210 of the test battery pack 200 after the first test, the opening pressure of the explosion-proof valve 220 can be gradually reduced, for example, by 0.2 kPa each time, and then the test can be repeated. If, after the test, no liquid enters the casing 210 of the test battery pack 200 when the opening pressure of the explosion-proof valve 220 is reduced to 3.6 kPa, and after the test, liquid enters the casing 210 of the test battery pack 200 when the opening pressure of the explosion-proof valve 220 is 3.4 kPa, then the minimum opening pressure of the explosion-proof valve 220 can be set to 3.6 kPa. Similarly, different opening pressure values ​​can still be selected between 3.6 kPa and 3.4 kPa for testing to determine the relatively minimum opening pressure value.

[0046] During testing, the opening pressure of the explosion-proof valve 220 can be adjusted based on the opening pressure value and test results from the first test. Through multiple tests, the minimum opening pressure of the explosion-proof valve 220 can be determined. The adjustment amount for the opening pressure value can be the same or different each time. The opening pressure value can be determined using different models of explosion-proof valves 220, or it can be determined by adjusting the spring of the same explosion-proof valve 220.

[0047] The calibration fixture 100 and calibration equipment provided in this implementation scheme can calibrate the minimum opening pressure (i.e., the lower limit of the opening pressure) of the explosion-proof valve 220. This can prevent the explosion-proof valve 220 from opening erroneously during vehicle operation due to excessively low opening pressure, thereby preventing foreign objects from entering the battery pack and causing insulation failure or short circuits, ensuring the safety and reliability of the battery pack during electric vehicle operation. The calibration fixture 100 has a simple structure and can be combined with vibration and shock tests on the battery pack for easy implementation.

[0048] Please refer to this as well. Figures 6 to 8 , Figure 6 for Figure 2 Structural diagram of the middle casing. Figure 7 for Figure 2 Structural diagram of the middle cover body. Figure 8 for Figure 7 Cross-sectional view along the BB direction.

[0049] In some implementations, at least a portion of the wall panel of the calibration fixture 100 is a transparent panel. This allows operators to easily observe the liquid level in the injection chamber 101 during testing, preventing the liquid level from becoming too high and submerging the explosion-proof valve 220, which could affect the opening of the explosion-proof valve 220 due to liquid pressure.

[0050] During the test, the explosion-proof valve 220 only needs to be partially submerged in the liquid in the receiving chamber 101. For example, the liquid level in the receiving chamber 101 can be between 1 / 3 and 1 / 2 of the height of the explosion-proof valve 220.

[0051] The calibration fixture 100 may include a plurality of wall panels that enclose a receiving chamber 101 having an opening 102. The aforementioned at least partial wall panel may be at least one of a plurality of wall panels. Alternatively, the aforementioned at least partial wall panel may be at least a portion of a single wall panel; for example, an observation window may be provided on a single wall panel and sealed by a transparent plate.

[0052] In one implementation example, the transparent plate and its opening 102 of the calibration fixture 100 are respectively located at opposite ends of the calibration fixture 100. In this way, during the test, after the calibration fixture 100 is connected to the housing 210 of the test battery pack 200, the transparent plate is opposite to the explosion-proof valve 220, which makes it convenient for the operator to observe the liquid level in the injection chamber 101 more accurately.

[0053] In some implementations, the calibration fixture 100 includes a cover body 110, which includes a housing 111 and a cover end cap 112. The housing 111 has a cavity with openings at both ends, with one end opening of the housing 111 and the other end opening of the housing 111 arranged opposite to each other. The cover end cap 112 is connected to the housing 111, and the cover end cap 112 blocks one end opening of the housing 111, while the other end opening of the housing 111 forms an opening 102. The cover end cap 112 and the housing 111 can be closed to form a receiving chamber 101. The cover end cap 112 can be a transparent plate, such as a transparent acrylic plate or other transparent plastic plate. It can be understood that the cover end cap 112 is a wall panel of the cover body 110.

[0054] In one implementation example, such as Figure 2 and Figure 6 As shown, the casing 111 is generally rectangular in shape and includes a first wall panel 1111, a second wall panel 1112, a third wall panel 1113, and a fourth wall panel 1114. The first and second wall panels 1111 and 1112 are positioned opposite each other, as are the third and fourth wall panels 1113 and 1114. The third wall panel 1113 connects to one end of the first and second wall panels 1111 and 1112, and the fourth wall panel 1114 connects to the other end of the first and second wall panels 1111 and 1112. Thus, the first, second, and third wall panels 1111, 1112, 1113, and 1114 together form a frame structure with openings at both ends in the first direction D1. The opening at one end of the casing 111 in the first direction D1 forms an opening 102.

[0055] The housing 111 and the end cap 112 can be separately configured, with the end cap 112 sealed to the housing 111. For example, the end cap 112 and the housing 111 can be sealed together with sealant. In a design where the end cap 112 is a transparent plate, separating the housing 111 and the end cap 112 facilitates the processing of both.

[0056] In some implementations, a first flange connection plate 1115 is provided at the end of the opening 102 of the calibration fixture 100. In the illustrated example, the cover 111 has an opening at one end in the first direction D1 with the first flange connection plate 1115. During the calibration test, the cover 111 is sealed to the housing 210 of the test battery pack 200 through the first flange connection plate 1115.

[0057] The first flange connection plate 1115 can increase the connection area between the calibration fixture 100 and the housing 210, making it easier to achieve a seal between the calibration fixture 100 and the housing 210, and preventing the leakage of liquid in the containment chamber 101 during the test, which would lead to test failure.

[0058] The first flange connecting plate 1115 and the side wall 211 of the housing 210 can be sealed together with sealant.

[0059] The first flange connecting plate 1115 can also be fixed to the side wall 211 of the housing 210 by bolts or other fasteners, and a seal can be achieved by using a sealing ring or gasket.

[0060] In some implementations, the calibration fixture 100 includes a liquid injection tube 130, one end of which is connected to the receiving chamber 101, and the other end of which forms a liquid injection port 103. Thus, during calibration tests, liquid injection can be performed through the liquid injection tube 130, which can be connected to a liquid source via a pipeline, facilitating the implementation of the liquid injection operation.

[0061] In addition, during the test, the accommodating chamber 101 of the calibration fixture 100 can be connected to the outside through the injection pipe 130, which can ensure the pressure balance inside and outside the calibration fixture 100 and avoid the pressure difference between the inside and outside of the calibration fixture 100 from affecting the test results.

[0062] During the test, the injection pipe 130 can be positioned on top of the calibration fixture 100 to prevent liquid leakage through the injection pipe 130 during the test.

[0063] In one implementation example, the injection tube 130 includes a first tube segment 131 and a second tube segment 132, with the extension direction of the first tube segment 131 intersecting the extension direction of the second tube segment 132. In other words, the first tube segment 131 and the second tube segment 132 are arranged at a certain angle, i.e., the injection tube 130 has a bent structure. This can prevent the probability of liquid in the containing chamber 101 leaking out through the injection tube 130 during the test, thus ensuring the reliability of the calibration test.

[0064] For example, in the test state, the first pipe section 131 can extend vertically, the second pipe section 132 can extend horizontally, and the injection pipe 130 has a 90-degree horizontal bend, which can prevent the liquid from being splashed outside the calibration fixture 100 due to vibration and impact during the test.

[0065] In some implementations, a wall panel of the main body 110 of the calibration fixture 100 is provided with multiple filter holes 104, and the liquid injection pipe 130 is connected to the receiving chamber 101 through the filter holes 104. The multiple filter holes 104 can reduce the probability of liquid splashing during vibration and shock tests while balancing the internal and external pressures of the calibration fixture 100.

[0066] It is understandable that the pore size of filter hole 104 is smaller than the diameter of injection tube 130.

[0067] During the test, the housing 110 of the calibration fixture 100 can be arranged in the posture shown in the figure. The second wall plate 1112 of the housing 110 is located at the top, and the injection pipe 130 is connected to the receiving chamber 101 through the second wall plate 1112, so that the injection pipe 130 is located at the top of the calibration fixture 100 during the test, which ensures the injection of liquid and reduces the probability of liquid leakage during the test.

[0068] In a specific implementation, the second wall plate 1112 of the cover 110 is provided with a plurality of filter holes 104. The shape, diameter, number and arrangement of the filter holes 104 can be set as needed, and are not limited to those shown in the figure.

[0069] In some embodiments, the calibration fixture 100 includes a cover body 120, which is connected to a wall panel with filter holes 104. The cover body 120 and the wall panel with filter holes 104 enclose a transition chamber, and an injection tube 130 is inserted into the cover body 120. In this way, the injection tube 130 communicates with the receiving chamber 101 through the transition chamber and the filter holes 104.

[0070] In the illustrated scheme, the cover body 120 is connected to the second wall panel 1112.

[0071] For example, the cover body 120 and the injection tube 130 can be designed as an integral structure to reduce assembly steps.

[0072] The number of injection tubes 130 can be set as needed. In the illustrated scheme, there are three injection tubes 130.

[0073] like Figure 7 and Figure 8 As shown, one end of the first section 131 of the injection tube 130 is inserted into the cover body 120, and the other end of the first section 131 is connected to one end of the second section 132, with the other end of the second section 132 forming an injection port 103.

[0074] In some embodiments, the cover body 120 includes a second flange connection plate 121, which is sealed to a wall panel 1112 having filter holes 104.

[0075] For example, the second flange connection plate 121 can be sealed to the second wall panel 1112 with sealant.

[0076] For example, the second flange connecting plate 12 can also be connected to the second wall plate 1112 by fasteners such as bolts, and then a sealing ring or sealing gasket can be used to achieve a seal between the cover body 120 and the cover housing 111.

[0077] In practice, the cover 120 completely covers the multiple filter holes 104.

[0078] In practical applications, to facilitate observation of the liquid level in the calibration fixture 100 and to facilitate observation of whether liquid has entered the test battery pack after the test, the liquid injected into the calibration fixture 100 during the test can be a colored liquid, such as muddy water.

[0079] The calibration fixture 100 and calibration equipment provided in this application embodiment can calibrate the minimum opening pressure of the explosion-proof valve 220 of the battery pack in combination with the actual operating conditions of the vehicle, so as to avoid the explosion-proof valve 220 from being accidentally opened during vehicle operation. Correspondingly, it can avoid the phenomenon of foreign objects entering the battery pack due to the failure of the sealing interface between the explosion-proof valve 220 and the battery pack caused by the accidental opening of the explosion-proof valve 220. For example, when the vehicle is driving in a flooded section of road, it can avoid the risk of insulation failure or short circuit caused by water entering the battery pack due to the accidental opening of the explosion-proof valve 220.

[0080] The ordinal numbers used in this article, such as first and second, are used to distinguish different parts with the same name and do not indicate a specific order or primary / secondary relationship.

[0081] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A calibration tool for testing the opening pressure calibration of a relief valve (220) of a battery pack (200), characterized in that, The calibration tool (100) comprises a containing chamber (101) with an open mouth (102) and a liquid injection port (103) in communication with the containing chamber (101), and the open mouth (102) of the calibration tool (100) is connected with a box (210) of the test battery pack (200), and the containing chamber (101) contains the explosion-proof valve (220).

2. The calibration tool of claim 1, wherein, At least part of the wall plate of the calibration tool (100) is a transparent plate.

3. The calibration tool of claim 2, wherein, The transparent plate and the open mouth (102) are arranged at opposite ends of the calibration tool (100).

4. The calibration tool of claim 2, wherein, The calibration tool (100) comprises a cover main body (110), the cover main body (110) comprises a cover shell (111) and a cover end cover (112), the cover shell (111) has a cavity with two open ends, one end opening of the cover shell (111) is arranged opposite to the other end opening of the cover shell (111), the cover end cover (112) is connected with the cover shell (111), the cover end cover (112) blocks the one end opening of the cover shell (111), and the other end opening of the cover shell (111) forms the open mouth (102); the cover end cover (112) is the transparent plate.

5. The calibration tool of claim 4, wherein, The cover shell (111) and the cover end cover (112) are arranged in a split mode, and the cover end cover (112) is sealingly connected with the cover shell (111).

6. The calibration fixture of claim 1, wherein, The end of the calibration tool (100) where the open mouth (102) is located is provided with a first flange connecting disc (1115), and the first flange connecting disc (1115) is sealingly connected with the box (210).

7. The calibration fixture of any of claims 1-6, wherein, The calibration tool (100) comprises a liquid injection pipe (130), one end of the liquid injection pipe (130) is in communication with the containing chamber (101), and the other end of the liquid injection pipe (130) forms the liquid injection port (103).

8. The calibration tool of claim 7, wherein, The liquid injection pipe (130) comprises a first pipe section (131) and a second pipe section (132), and the extension directions of the first pipe section (131) and the second pipe section (132) are arranged in an intersecting mode.

9. The calibration tool of claim 7, wherein, The calibration tool (100) comprises a cover main body (110), the cover main body (110) has the containing chamber (101), one wall plate of the cover main body (110) is provided with a plurality of filter holes (104), and the liquid injection pipe (130) communicates with the containing chamber (101) through the filter holes (104).

10. The calibration tool of claim 9, wherein, The calibration tool (100) comprises a cover cap body (120), the cover cap body (120) is connected with the wall plate provided with the filter holes (104), the cover cap body (120) and the wall plate provided with the filter holes (104) enclose a transition chamber, and the liquid injection pipe (130) is inserted into the cover cap body (120).

11. The calibration tool of claim 10, wherein, The cover cap body (120) comprises a second flange connecting disc (121), and the second flange connecting disc (121) is sealingly connected with the wall plate provided with the filter holes (104).

12. A calibration apparatus characterized by The test battery pack (200), a vibration test bench and a calibration tool (100), wherein the calibration tool (100) is the calibration tool according to any one of claims 1-11, the calibration tool (100) is connected with a box (210) of the test battery pack (200), an explosion-proof valve (220) installed on the box (210) is located in the containing cavity (101), and the test battery pack (200) is installed on the vibration test bench.

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