Measuring and collecting device for gas production rate of battery

Abstract

The utility model relates to the technical field of batteries, in particular to a battery gas production rate measuring and collecting device which comprises a battery to be measured, a flow guide gas pipe used for conveying gas is arranged on the battery to be measured, a liquid injection butt joint plate is installed on the battery to be measured through a bolt, and a butt joint pipe is arranged on the liquid injection butt joint plate. A clamping mechanism matched with the butt joint pipe is arranged at one end of the flow guide air pipe, a sealing mechanism used for sealing is arranged on the clamping mechanism, an air production valve is arranged at the end, close to the to-be-tested battery, of the flow guide air pipe, and a plurality of volume testing units communicated with the flow guide air pipe are arranged at the end, away from the to-be-tested battery, of the flow guide air pipe. A fluid indicator is arranged at one end of the diversion gas pipe away from the gas production valve. According to the utility model, the liquid injection port of the battery to be tested is in butt joint with the air inlet of the flow guide air pipe, so that when air reaches the volume testing unit, the volume of produced air can be calculated according to the designed pipe diameter; through the fluid indicator, the color development effect on the acid gas can be achieved, and the change of the gas production rate can be observed in real time in the testing process.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a device for measuring and collecting gas production of batteries. Background Art

[0002] Against the backdrop of the "carbon peak and carbon neutrality" era, new energy sources are gaining increasing attention, and energy storage technologies, represented by lithium-ion batteries, are experiencing rapid development. Due to their high energy density, compact size, and long service life, lithium-ion batteries have become widely used in production and daily life.

[0003] In lithium-ion batteries, side reactions between the electrolyte and the positive and negative electrode materials are a key factor contributing to rapid capacity decay. This process produces a large amount of gas, which worsens the electrolyte's wetting between the separator and the positive and negative electrodes, leading to a sharp increase in internal polarization and rapid capacity decay. Furthermore, the gradual accumulation of gas produced by the decomposition of the electrolyte during charge and discharge can increase internal battery pressure and even cause severe swelling, leading to structural deformation. Misalignment between the electrode and the separator can cause an internal short circuit, generating significant heat that rapidly increases the battery temperature, triggering thermal runaway and potentially causing violent battery combustion.

[0004] Currently, the primary method used in the industry to assess battery gas production is the isobaric method. This method maintains consistent pressure inside and outside the battery cell and measures the volume change to determine the amount of gas. This volume change is measured using the Archimedean displacement method. This testing method has limited application and is only effective for soft-pack batteries. It cannot accurately measure gas production for batteries with less pronounced deformation, such as prismatic and cylindrical batteries. Furthermore, this method can only be used to test gas production at the end of battery testing, making it impossible to observe changes in gas production in real time during testing.

[0005] Based on this, a device for measuring and collecting gas production of a battery is now provided, which can eliminate the drawbacks of existing devices. Utility Model Content

[0006] In response to the above problems, a device for measuring and collecting battery gas production is provided, which solves the problem of observing the changes in gas production in real time during the test process of the equipment through a volume measurement unit.

[0007] In order to solve the problems of the existing technology, the utility model provides a device for measuring and collecting the gas production of a battery, including a battery to be tested, wherein the battery to be tested is provided with a guide air pipe for conveying gas, the battery to be tested is provided with a liquid injection docking plate installed on the battery to be tested by bolts, the liquid injection docking plate is provided with a docking pipe, one end of the guide air pipe is provided with a clamping mechanism that cooperates with the docking pipe, the clamping mechanism is provided with a sealing mechanism for sealing, the end of the guide air pipe close to the battery to be tested is provided with a gas production valve, the end of the guide air pipe away from the battery to be tested is provided with several volume testing units connected to the same, and the end of the guide air pipe away from the gas production valve is provided with a fluid indicator.

[0008] Preferably, the volume testing unit includes a fixture, an air duct, an exhaust valve, a mounting ring and an air intake valve. The air duct is wound around the side wall of the fixture. The fixture is provided with several mounting rings for fixing the air duct. The air duct is provided with an air intake valve at one end close to the flow air duct, and an exhaust valve at the other end of the air duct. The end of the air duct close to the flow air duct is connected to the flow air duct, and the end of the air duct away from the flow air duct is connected to the adjacent air duct through a docking mechanism.

[0009] Preferably, the clamping mechanism includes a mounting block, a clamping block, a return spring, a clamping hole, a docking joint support ring and an unlocking block. The outer periphery of the docking tube is provided with a support ring, the air guide tube is provided with a docking joint at the end away from the fluid indicator, the docking joint is symmetrically provided with clamping holes, the inner wall of the support ring is provided with a mounting block, a clamping block matching the clamping hole is slidingly provided in the mounting block, the two ends of the reset spring are respectively connected to the inner wall of the mounting block and the side wall of the clamping block, and an unlocking block is provided on the side wall.

[0010] Preferably, the sealing mechanism includes a connecting ring and a sealing ring, the connecting ring is slidably arranged on the periphery of the supporting ring, the outer sleeve of the docking joint is provided with a sealing ring that matches the connecting ring, and the contact surface between the connecting ring and the sealing ring is provided with a sealing ring.

[0011] Preferably, the docking mechanism includes a threaded docking interface and a docking ring. The threaded docking interface is rotatably arranged at one end of the air duct away from the intake valve. The docking ring is arranged on the adjacent air duct and cooperates with the threaded docking interface. A thread cooperating with the threaded docking interface is provided in the docking ring.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. The utility model connects the liquid injection port of the battery to be tested with the air inlet of the guide air pipe. The gas produced by the battery causes the air pressure to increase. The air inlet valve is opened, and the gas pushes the fluid in the pipe forward to reach the volume test unit. The position reached by the gas can be measured, and the volume of the gas produced can be calculated according to the designed pipe diameter.

[0014] 2. The utility model is provided with a fluid indicator, which can play a role in coloring the acid gas, can show the location of the gas flow, and can realize real-time observation of the change of gas production during the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The present invention is a three-dimensional structural diagram of a device for measuring and collecting gas production of a battery.

[0016] Figure 2 The diagram is a partial three-dimensional structural diagram of a device for measuring and collecting gas production of a battery.

[0017] Figure 3 It is a device for measuring and collecting battery gas production. Figure 1 Schematic diagram of the partially enlarged three-dimensional structure of A in the middle.

[0018] The numbers in the figure are: 101, battery to be tested; 102, fluid indicator; 103, bolt; 104, docking tube; 105, liquid injection docking plate; 106, gas production valve; 107, gas guide pipe; 200, docking mechanism; 201, threaded docking port; 202, docking ring; 300, clamping mechanism; 301, mounting block; 302, clamping block; 303, reset spring; 304, clamping hole; 305, docking head; 306, support ring; 307, unlocking block; 400, sealing mechanism; 401, connecting ring; 402, sealing ring; 500, volume test unit; 501, holder; 502, gas guide pipe; 503, exhaust valve; 504, mounting ring; 505, intake valve. DETAILED DESCRIPTION

[0019] In order to further understand the features, technical means, specific objectives and functions achieved by the present invention, the present invention is described in further detail below in conjunction with the accompanying drawings and specific implementation methods.

[0020] Reference Figure 1-Figure 3 : A device for measuring and collecting battery gas production, comprising a battery to be tested 101, wherein the battery to be tested 101 is provided with a guide air pipe 107 for conveying gas, a liquid injection docking plate 105 is installed on the battery to be tested 101 by a bolt 103, and the liquid injection docking plate 105 is provided with a docking pipe 104, one end of the guide air pipe 107 is provided with a clamping mechanism 300 that cooperates with the docking pipe 104, and the clamping mechanism 300 is provided with a sealing mechanism 400 for sealing, the end of the guide air pipe 107 close to the battery to be tested 101 is provided with a gas production valve 106, the end of the guide air pipe 107 away from the battery to be tested 101 is provided with several volume test units 500 connected to the volume test unit, and the end of the guide air pipe 107 away from the gas production valve 106 is provided with a fluid indicator 102.

[0021] The gas guide tube 107 is used to connect with the liquid injection port of the battery to be tested 101. The gas guide tube 107 can be quickly connected and installed on the liquid injection port through the clamping mechanism 300 and the sealing mechanism 400. The gas production by the battery causes the gas pressure to increase, and the gas production valve 106 and the air inlet valve 505 are opened. The gas pushes the fluid in the tube forward and reaches the volume testing unit 500. The position reached by the gas is measured, and the volume of the gas produced is calculated based on the designed tube diameter. The gas passes through the fluid indicator 102. The fluid indicator 102 can play a coloring role on the acidic gas and can display the position of the gas flow, so that the change of gas production can be observed in real time during the test.

[0022] Reference Figure 1-Figure 2 : The volume testing unit 500 includes a fixture 501, an air duct 502, an exhaust valve 503, a mounting ring 504 and an intake valve 505. The air duct 502 is wound around the side wall of the fixture 501. The fixture 501 is provided with several mounting rings 504 for fixing the air duct 502. The air duct 502 is provided with an intake valve 505 at one end close to the flow air duct 107, and an exhaust valve 503 at the other end of the air duct 502. The end of the air duct 502 close to the flow air duct 107 is connected to the flow air duct 107, and the end of the air duct 502 away from the flow air duct 107 is connected to the adjacent air duct 502 through the docking mechanism 200.

[0023] The length of the gas pipe 502 is fixed, and it is installed on the fixture 501 through the mounting ring 504. The air inlet valve 505 is opened to transport the gas into the gas pipe 502, and the position reached by the gas is measured. The volume of the gas produced is calculated based on the designed pipe diameter. The exhaust valve 503 is used to discharge the gas after the test is completed, which facilitates the subsequent sampling and testing of the gas production components. There are several such volume test units 500, and several volume test units 500 can be added according to actual needs. Adjacent volume test units 500 are docked through the docking mechanism 200.

[0024] Reference Figure 1-Figure 2 : The clamping mechanism 300 includes a mounting block 301, a clamping block 302, a return spring 303, a clamping hole 304, a docking joint 305, a support ring 306 and an unlocking block 307. The outer periphery of the docking tube 104 is provided with a support ring 306, and the end of the guide air tube 107 away from the fluid indicator 102 is provided with a docking joint 305, and the docking joint 305 is symmetrically provided with clamping holes 304. The inner wall of the support ring 306 is installed with a mounting block 301, and a clamping block 302 that cooperates with the clamping hole 304 is slidably provided in the mounting block 301. The two ends of the return spring 303 are respectively connected to the inner wall of the mounting block 301 and the side wall of the clamping block 302, and the side wall of the clamping block 302 is provided with an unlocking block 307.

[0025] Align the docking joint 305 with the docking tube 104 and press it downward. The clamping block 302 receives pressure and drives the reset spring 303 to retract in the mounting block 301. When the clamping block 302 encounters the clamping hole 304, the reset spring 303 drives the clamping block 302 to reset and fix the docking joint 305, so that the docking joint 305 can be fixed in the docking tube 104. When unlocking is required, the unlocking block 307 is pulled to drive the clamping block 302 to retract, thereby improving the efficiency of docking the air inlet of the guide air pipe 107 and the liquid filling port of the battery to be tested 101.

[0026] Reference Figure 1-Figure 2 : The sealing mechanism 400 includes a connecting ring 401 and a sealing ring 402. The connecting ring 401 is slidably arranged on the periphery of the support ring 306. The outer sleeve of the docking joint 305 is provided with a sealing ring 402 that cooperates with the connecting ring 401. The contact surface between the connecting ring 401 and the sealing ring 402 is provided with a sealing ring.

[0027] After the docking joint 305 and the docking tube 104 are docked and fixed, the sealing ring 402 is slid upward to drive the sealing ring 402 to cooperate with the connecting ring 401, so as to seal the joint between the liquid filling port of the battery to be tested 101 and the air inlet of the guide air pipe 107. When unlocking, the sealing ring 402 is first slid downward to unlock the connecting ring 401, and the docking joint 305 and the docking tube 104 can be unlocked by sliding the unlocking block 307, thereby improving the docking efficiency between the liquid filling port of the battery to be tested 101 and the air inlet of the guide air pipe 107 and facilitating operation.

[0028] Reference Figure 3 : The docking mechanism 200 includes a threaded docking port 201 and a docking ring 202. The threaded docking port 201 is rotatably arranged at one end of the air guide tube 502 away from the air intake valve 505. The docking ring 202 is arranged on the adjacent air guide tube 502 and cooperates with the threaded docking port 201. A thread that cooperates with the threaded docking port 201 is provided in the docking ring 202.

[0029] Align the threaded docking port 201 on the air guide tube 502 with the docking ring 202 on the adjacent air guide tube 502, and rotate the threaded docking port 201. By matching the threaded docking port 201 with the thread in the docking ring 202, the adjacent volume test units 500 can be docked and installed, so as to increase the capacity of measuring gas volume according to needs.

[0030] Working principle: insert the docking joint 305 on the gas guide tube 107 into the docking tube 104, and fix it by matching the clamping block 302 with the clamping hole 304, and the sliding sealing ring 402 matches the connecting ring 401 to seal the connection between the liquid filling port of the battery 101 to be tested and the air inlet of the gas guide tube 107. The gas production by the battery causes the air pressure to increase, and the gas production valve 106 and the air inlet valve 505 are opened. The gas pushes the fluid in the tube forward and reaches the volume test unit 500. The position where the gas reaches is measured, and the volume of the gas produced is calculated according to the designed tube diameter. The gas passes through the fluid indicator 102, and the fluid indicator 102 can play a coloring role on the acid gas and can show the position of the gas flow. It is possible to observe the changes in gas production in real time during the test, and volume test units 500 can be added as needed. Adjacent volume test units 500 can be docked and installed by rotating the threaded docking port 201 to connect with the docking ring 202. After the test, the gas is discharged through the exhaust valve 503, which facilitates subsequent sampling and testing of gas production components. When it is necessary to unlock the liquid filling port of the battery to be tested 101 and the air inlet of the guide air pipe 107, the sealing ring 402 is first slid downward to unlock it with the connecting ring 401, and the sliding unlocking block 307 can be used to unlock the docking joint 305 and the docking pipe 104, thereby improving the efficiency of docking and unlocking the liquid filling port of the battery to be tested 101 and the air inlet of the guide air pipe 107.

[0031] The above embodiments merely represent one or several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A device for measuring and collecting battery gas production, characterized in that: The invention comprises a battery to be tested (101), wherein the battery to be tested (101) is provided with a gas guide pipe (107) for conveying gas, a liquid injection docking plate (105) is installed on the battery to be tested (101) via a bolt (103), a docking pipe (104) is provided on the liquid injection docking plate (105), one end of the gas guide pipe (107) is provided with a clamping mechanism (300) matched with the docking pipe (104), and the clamping mechanism (300) is provided with a sealing mechanism (400) for sealing, a gas production valve (106) is provided at one end of the gas guide pipe (107) close to the battery to be tested (101), a plurality of volume test units (500) are provided at one end of the gas guide pipe (107) away from the battery to be tested (101) and connected thereto, and a fluid indicator (102) is provided at one end of the gas guide pipe (107) away from the gas production valve (106).

2. A device for measuring and collecting battery gas production according to claim 1, characterized in that: The volume test unit (500) comprises a holder (501), an air guide tube (502), an exhaust valve (503), a mounting ring (504) and an intake valve (505); the air guide tube (502) is wound around the side wall of the holder (501); the holder (501) is provided with a plurality of mounting rings (504) for fixing the air guide tube (502); an intake valve (505) is provided at one end of the air guide tube (502) close to the flow guide tube (107); an exhaust valve (503) is provided at the other end of the air guide tube (502); an end of the air guide tube (502) close to the flow guide tube (107) is connected to the flow guide tube (107); and an end of the air guide tube (502) away from the flow guide tube (107) is connected to an adjacent air guide tube (502) via a docking mechanism (200).

3. The device for measuring and collecting battery gas production according to claim 1, characterized in that: The clamping mechanism (300) comprises a mounting block (301), a clamping block (302), a return spring (303), a clamping hole (304), a docking joint (305), a support ring (306) and an unlocking block (307). The support ring (306) is provided on the outer periphery of the docking tube (104). The end of the air guide tube (107) away from the fluid indicator (102) is provided with a docking joint (305). The clamping holes (304) are symmetrically provided on the docking joint (305). The mounting block (301) is installed on the inner wall of the support ring (306). The clamping block (302) matching the clamping hole (304) is slidably provided in the mounting block (301). The two ends of the return spring (303) are respectively connected to the inner wall of the mounting block (301) and the side wall of the clamping block (302). The side wall (302) is provided with an unlocking block (307).

4. The device for measuring and collecting battery gas production according to claim 3, characterized in that: The sealing mechanism (400) comprises a connecting ring (401) and a sealing ring (402); the connecting ring (401) is slidably arranged on the periphery of the supporting ring (306); the sealing ring (402) matching the connecting ring (401) is sleeved on the periphery of the docking joint (305); and a sealing ring is provided on the contact surface between the connecting ring (401) and the sealing ring (402).

5. The device for measuring and collecting battery gas production according to claim 2, characterized in that: The docking mechanism (200) comprises a threaded docking interface (201) and a docking ring (202); the threaded docking interface (201) is rotatably arranged at one end of the air guide tube (502) away from the air intake valve (505); the docking ring (202) is arranged on the adjacent air guide tube (502) and matched with the threaded docking interface (201); and a thread matching the threaded docking interface (201) is provided in the docking ring (202).

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