Device for testing exhaust rate of battery cell explosion-proof structure

Abstract

The utility model provides a testing device for the exhaust rate of an explosion-proof structure of a battery cell, and relates to the technical field of battery cells. A to-be-detected battery cell is placed on the table top, the large end face of the to-be-detected battery cell is closely attached to the outer wall of the table top, the attaching faces of the two are planes, an interface is formed in the bottom end of the to-be-detected battery cell, the outer end of the interface is connected with a gas pipe, and a gas transmission detection structure is installed at the tail end of the gas pipe. A supporting frame is installed on the outer wall of the table top, a height gauge is installed at the tail end of the supporting frame through a bolt, an ejector pin structure making contact with the outer wall of a to-be-detected battery cell is arranged at the tail end of the height gauge, the to-be-detected battery cell is parallel to the table top and is in a horizontal type, an anti-explosion structure is arranged at the outer end of the to-be-detected battery cell, and the anti-explosion structure is an anti-explosion opening or an anti-explosion valve. And the exhaust rate of the explosion-proof valve and the relationship between the rate and the deformation amount of the battery cell can be quantitatively judged.

Description

Technical Field

[0001] The utility model relates to the technical field of battery cells, and more specifically, the utility model relates to a testing device for the exhaust rate of an explosion-proof structure of a battery cell. Background Art

[0002] Lithium-ion batteries are increasingly being used in electric bicycles, electric motorcycles, and electric vehicles. Since the single battery cells of power lithium-ion batteries generally have a large capacity, in order to avoid serious consequences caused by short circuits, overcharging, over-discharging, etc. during the use of the battery, single batteries are generally equipped with explosion-proof devices. The principle of this explosion-proof device is that when the internal pressure of the battery reaches a certain value, the explosion-proof notch or explosion-proof valve ruptures to release gas. After the lithium battery malfunctions, whether the gas generated inside the battery cell can be quickly discharged from the explosion-proof valve is the last line of protection for the battery cell. How to determine whether the size of the safety valve of the lithium battery meets the exhaust rate of the battery cell has become a problem. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is: how to accurately determine whether the size of the safety valve of the lithium battery meets the exhaust rate of the battery cell. In view of the problems existing in the prior art, a testing device for the exhaust rate of an explosion-proof structure of a battery cell is provided.

[0004] The purpose and effect of the utility model are achieved by the following specific technical means: a testing device for the exhaust rate of an explosion-proof structure of a battery cell, comprising:

[0005] A desktop;

[0006] A battery cell to be tested is placed on the desktop, and the large end face of the battery cell to be tested is closely attached to the outer wall of the desktop. Both the attachment surfaces are flat. An interface is provided at the bottom end of the battery cell to be tested, a trachea is connected to the outer end of the interface, and a gas transmission detection structure is installed at the end of the trachea.

[0007] A support frame is installed on the outer wall of the desktop, a height gauge is installed at the end of the support frame through bolts, and a thimble structure in contact with the outer wall of the battery cell to be tested is provided at the end of the height gauge.

[0008] Further preferred solution: The battery cell to be tested is parallel to the desktop and is in a horizontal position.

[0009] Further preferred solution: An explosion-proof structure is provided at the outer end of the battery cell to be tested, and the explosion-proof structure is an explosion-proof port or an explosion-proof valve.

[0010] Further preferred solution: The gas transmission detection structure includes a gas flow meter and a gas transmission device connected to the gas flow meter through a pipeline.

[0011] Further preferred solution: An air flow channel is provided inside the gas flow meter, and scale lines are provided on the outer wall of the air flow channel;

[0012] A flow meter float ball is arranged inside the air flow channel.

[0013] A further preferred solution: A regulating valve is installed in the pipeline connecting the gas transmission device and the gas flow meter.

[0014] A further preferred solution: The support frame is composed of a vertical rod and a cross bar, and the vertical rod and the cross bar are installed through a cross clamp.

[0015] Advantages of the present utility model:

[0016] The air flow entering the cell under test leaks out from the explosion-proof structure. At the same time, whether the cell under test is deformed can be detected through a height gauge. If the cell under test is not deformed, the specification of the explosion-proof valve meets the requirements of the cell's safe exhaust. If the cell under test is deformed, an explosion-proof valve with a larger specification needs to be selected. In this way, the exhaust rate of the explosion-proof valve and the relationship between the rate and the deformation amount of the cell can be quantitatively judged. Description of the Drawings

[0017] The present utility model will be further described below in conjunction with the description of the drawings.

[0018] Figure 1 It is a top view schematic diagram of the overall structure of the present utility model;

[0019] Figure 2 It is a plan view schematic diagram of the overall structure of the present utility model.

[0020] Figure 1 - Figure 2 In the figure: cell under test (1), explosion-proof structure (2), interface (3), air pipe (4), gas flow meter (5), flow meter float ball (6), gas transmission device (7), regulating valve (8), table top (9), support frame (10), height gauge (11). Specific Embodiments

[0021] In order to more clearly understand the above-mentioned objects, features and advantages of the present utility model, the present utility model will be further described in detail below in conjunction with the drawings and specific embodiments. The following embodiments are only examples for implementing the present utility model. It must be pointed out that the disclosed embodiments do not limit the scope of the present utility model. On the contrary, all modifications and refinements made without departing from the scope of the present utility model fall within the scope of the patent protection of the present utility model.

[0022] Please refer to Figure 1 - Figure 2 , An inspection device for the exhaust rate of an explosion-proof structure of a cell, including:

[0023] A cell 1 to be tested is placed on the desktop 9. The cell 1 to be tested is square, and the large end surface of the cell 1 to be tested is closely attached to the outer wall of the desktop 9. Both of the close surfaces are flat to ensure the fit. An interface 3 is provided at the bottom of the cell 1 to be tested, and an air pipe 4 is connected to the outer end of the interface 3, and a gas transmission detection structure is installed at the end of the air pipe 4.

[0024] Preparation before inspection: A support frame 10 is installed on the outer wall of the table 9, and a height gauge 11 is installed at the end of the support frame 10 through bolts. The height gauge 11 is suspended above the battery cell 1 to be tested (such as Figure 2 As shown), and the end of the height gauge 11 is provided with a pin structure in contact with the large end surface of the battery cell 1 to be tested, the support frame 10 is composed of a longitudinal rod and a transverse rod, and the longitudinal rod and the transverse rod are installed by a cross clamp, and a knob is provided on the cross clamp for adjusting the longitudinal and transverse positions of the longitudinal rod and the transverse rod, thereby adjusting the position of the pin of the height gauge 11 to ensure that the end of the pin is against the outer wall of the battery cell 1 to be tested;

[0025] Further preferably, the ejector pin may contact the large end face, the small end faces on both sides, or the top face of the battery cell. However, due to the special shape of the square battery, in order to improve the accuracy of the exhaust inspection, it is preferred that the ejector pin contact the large end face with a thinner wall thickness;

[0026] The gas transmission detection structure includes a gas flow meter 5, and a gas transmission device 7 connected to the gas flow meter 5 through a pipeline. The gas flow meter 5 is provided with an inlet and an outlet. The gas transmission device 7 is connected to the inlet of the gas flow meter through a pipeline, and the air pipe 4 is connected to the outlet of the gas flow meter 5. When performing the inspection, the gas transmission device 7 is turned on, and the gas is transmitted to the gas flow meter 5 through the gas transmission device 7. A regulating valve 8 is installed in the pipeline used to connect the gas transmission device 7 and the gas flow meter 5. The flow rate of the gas can be adjusted by the regulating valve 8. An air flow channel is arranged inside the gas flow meter 5, and a flow meter float 6 is arranged inside the air flow channel. The outer wall of the air flow channel is provided with scale lines. The diameters of the inlet and outlet of the gas flow meter 5 are both smaller than 1. In the air flow channel, prevent the flow meter float 6 from being separated from the air flow channel. The flow meter float 6 can play an indicating effect, allowing the detection personnel to know the flow rate per minute. Finally, the air flow enters the battery cell 1 to be tested. The outer end of the battery cell 1 to be tested is provided with an explosion-proof structure 2. The explosion-proof structure 2 is an explosion-proof port or an explosion-proof valve. The air flow entering the battery cell 1 to be tested will leak out from the explosion-proof structure 2. At the same time, the height gauge 11 can be used to detect whether the battery cell 1 to be tested is deformed. If the battery cell 1 to be tested is not deformed, the specifications of the explosion-proof valve meet the requirements of safe exhaust of the battery cell. If the battery cell 1 to be tested is deformed, a larger explosion-proof valve must be selected. In this way, the exhaust rate of the explosion-proof valve and the relationship between the rate and the deformation of the battery cell can be quantitatively judged.

Claims

1. A device for testing the exhaust rate of an explosion-proof structure of a battery cell, characterized in that: include: desktop; A cell to be tested is placed on the desktop, and the large end surface of the cell to be tested is closely attached to the outer wall of the desktop, and both of the close surfaces are flat. An interface is provided at the bottom of the cell to be tested, and an air pipe is connected to the outer end of the interface, and a gas transmission detection structure is installed at the end of the air pipe; A support frame is installed on the outer wall of the desktop, and a height gauge is installed at the end of the support frame through bolts, and a pin structure in contact with the outer wall of the battery cell to be tested is arranged at the end of the height gauge.

2. A device for testing the exhaust rate of an explosion-proof structure of a battery cell according to claim 1, characterized in that: The battery cell to be tested is parallel to the desktop and is horizontal.

3. The device for testing the exhaust rate of an explosion-proof structure of a battery cell according to claim 1, characterized in that: The outer end of the battery cell to be tested is provided with an explosion-proof structure, and the explosion-proof structure is an explosion-proof port or an explosion-proof valve.

4. A device for testing the exhaust rate of an explosion-proof structure of a battery cell according to claim 1, characterized in that: The gas transmission detection structure includes a gas flow meter and a gas transmission device connected to the gas flow meter through a pipeline.

5. A device for testing the exhaust rate of an explosion-proof structure of a battery cell according to claim 4, characterized in that: The gas flow meter is provided with an air flow channel inside, and the outer wall of the air flow channel is provided with scale lines; A flow meter float is arranged inside the air flow channel.

6. A device for testing the exhaust rate of an explosion-proof structure of a battery cell according to claim 4, characterized in that: A regulating valve is installed in the pipeline used to connect the gas transmission equipment with the gas flow meter.

7. A device for testing the exhaust rate of an explosion-proof structure of a battery cell according to claim 4, characterized in that: The support frame is composed of a longitudinal rod and a transverse rod, and the longitudinal rod and the transverse rod are installed through a cross clamp.

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