Device for measuring internal volume and gas production rate of battery

Abstract

The utility model belongs to the technical field of battery production, and discloses a device for measuring the internal volume and the gas yield of a battery, which comprises a gas storage tank filled with inert gas, a sealing box used for accommodating a single battery, a gas measuring and injecting device and a pressure measuring pipeline used for measuring the internal pressure of the single battery, the sealing box and the gas storage tank are communicated through a pressure regulation and control pipeline for regulating the internal pressure of the sealing box; the sealing box is provided with a first temperature measuring instrument for measuring the internal temperature of the sealing box; the gas measuring and injecting device is communicated with the gas storage tank through a gas inlet control pipeline; the pressure measuring pipeline comprises a gas collecting pipe, and an inserting part of the gas collecting pipe is inserted into the sealing box and is configured to be communicated with the interior of the single battery; and the connecting part of the gas collecting pipe is connected and communicated with the gas measuring and injecting device. The device for measuring the internal volume and the gas production rate of the battery is simple and convenient to operate, can accurately measure the internal volume and the gas production rate of the battery, and is more convenient and quicker.

Description

Technical Field

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

[0002] In order to extend the cycle life and improve the dynamic performance of hard-shell lithium batteries during the development process, it is necessary to increase the amount of electrolyte injected and retained. At the same time, it is necessary to understand whether the internal space of the battery cell is fully filled with electrolyte after injection. At this time, the internal space of the battery cell needs to be measured. During the development, testing or use of lithium batteries, chemical reactions will occur between the internal positive and negative electrode materials, electrolytes, binders and conductive agents, causing adverse effects such as battery cell capacity decay, battery gas production and bulging. At this time, it is necessary to analyze the volume and composition of the gas produced by the battery cell.

[0003] At present, there is no device in the prior art that can accurately measure the internal space of the battery cell; and the gas production test only has a device that monitors the pressure changes inside the battery cell online. Since the internal space of the battery cell cannot be accurately measured, the gas production volume cannot be accurately calculated. The offline method of testing the gas production of the battery cell in the prior art requires collecting the gas and then measuring it using the drainage method. During the gas collection process, leakage or the introduction of excess air is prone to occur, resulting in large errors in the drainage method test.

[0004] Therefore, there is an urgent need to provide a new type of battery internal volume and gas production measurement device to solve the above technical problems in the prior art. Utility Model Content

[0005] The utility model aims to provide a battery internal volume and gas production measurement device, which is simple and convenient to operate and can accurately measure the internal volume and gas production of the battery, which is more convenient and quick.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The device for measuring the internal volume and gas production of a battery comprises a gas storage tank, a sealed box, a gas measuring and injecting device and a pressure measuring pipeline, wherein the gas storage tank is provided with an inert gas; the sealed box is configured to accommodate a battery cell; the sealed box and the gas storage tank are connected via a pressure regulating pipeline for adjusting the internal pressure of the sealed box; the sealed box is provided with a first temperature measuring instrument for measuring the internal temperature of the sealed box; the gas measuring and injecting device and the gas storage tank are connected via an air intake control pipeline; the pressure measuring pipeline is used to measure the internal pressure of the battery cell, and the pressure measuring pipeline comprises a gas collection pipe, the gas collection pipe comprises a plug-in portion and a connecting portion disposed away from the plug-in portion, the plug-in portion of the gas collection pipe is inserted into the sealed box and is configured to be connected with the inside of the battery cell; the connecting portion of the gas collection pipe is connected and communicated with the gas measuring and injecting device.

[0008] Optionally, the pressure regulating pipeline includes a first pipeline, a first control valve and a first pressure measuring instrument, and the first pipeline connects the sealed box and the gas storage tank; in the air flow direction from the gas storage tank to the sealed box, the first pipeline is sequentially provided with the first control valve and the first pressure measuring instrument.

[0009] Optionally, the pressure measuring pipeline further includes a second control valve and a second pressure measuring instrument; in the airflow direction from the connecting portion to the plug-in portion, the gas collection pipe is sequentially provided with the second control valve and the second pressure measuring instrument.

[0010] Optionally, the gas measuring and injection device comprises a gas measuring cylinder and a pushing member, a piston is arranged in the gas measuring cylinder, the piston divides the inner cavity of the gas measuring cylinder into a first cavity and a second cavity, the first cavity of the gas measuring cylinder is connected with the gas storage tank through the air intake control pipeline, and the first cavity of the gas measuring cylinder is connected with the connecting part of the gas collection pipe; the gas measuring cylinder is provided with a second temperature measuring instrument for measuring the temperature of the first cavity of the gas measuring cylinder and a third pressure measuring instrument for measuring the pressure of the first cavity of the gas measuring cylinder; one end of the pushing member is in the second cavity of the gas measuring cylinder and connected with the piston; the other end of the pushing member passes through the gas measuring cylinder.

[0011] Optionally, the above-mentioned gas cylinder includes a bottle body, a first end plate and a second end plate, and the above-mentioned bottle body is provided with openings at both ends along the length direction thereof, and the above-mentioned first end plate and the second end plate respectively seal the openings at both ends of the above-mentioned bottle body; the above-mentioned piston is slidably arranged in the above-mentioned bottle body along the length direction of the above-mentioned bottle body; the above-mentioned first end plate is provided with a first through hole connected to the connecting part of the above-mentioned gas collection pipe and a second through hole connected to the above-mentioned intake control pipeline; the above-mentioned second end plate is provided with a third through hole slidably matched with the above-mentioned pushing member.

[0012] Optionally, the outer peripheral surface of the gas cylinder is provided with scales.

[0013] Optionally, the air intake control pipeline includes a second pipeline and a third control valve, the second pipeline is connected to the first cavity of the gas cylinder and the gas storage tank; the second pipeline is provided with a third control valve.

[0014] Optionally, the gas collection pipe is connected to the gas collecting bottle through a third pipeline; the third pipeline is provided with a fourth control valve.

[0015] Optionally, the end of the plug-in portion of the gas collection tube is a pointed end.

[0016] Optionally, it also includes a rubber sealing plug, which is configured to seal the gas collection hole of the battery cell; the plug-in portion of the gas collection pipe passes through the rubber sealing plug.

[0017] Beneficial effects:

[0018] The battery internal volume and gas production measuring device in the utility model adjusts the pressure in the sealed box by connecting the sealed box and the gas storage tank, so that the pressure difference between the inside and outside of the battery is kept at a constant value, so that the outer shell of the battery cell will not be deformed, thereby not affecting the measurement of the internal volume of the battery cell; the sealed box is provided with a first temperature measuring instrument for measuring the internal temperature, and is connected to the inside of the battery cell using a pressure measuring pipeline to measure the pressure inside the battery cell; the gas storage tank is used to transmit inert gas to the inside of the battery cell, and the inert gas does not react with the substances inside the battery cell. The gas measuring and gas injection device is not only used for the connection between the gas storage tank and the inside of the battery cell, but also has a gas measuring function, and can obtain volume, temperature and air pressure data. By directly reading the above parameters such as pressure, temperature and volume, the internal volume and gas production of the battery can be directly obtained, the measured data is more accurate and reliable, and the measurement method is more convenient and quick, which can improve the measurement accuracy and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a battery internal volume and gas production measurement device provided in a specific embodiment of the utility model;

[0020] Figure 2 It is a schematic diagram of a gas measuring and injecting device provided in a specific embodiment of the utility model.

[0021] In the figure:

[0022] 10. Battery cell; 100. Sealed box; 200. Gas collection tube; 300. Gas measuring and injection device; 310. Gas bottle; 311. Bottle body; 312. First end plate; 3121. First through hole; 3122. Second through hole; 313. Second end plate; 3131. Third through hole; 400. Pusher; 401. Piston; 510. First temperature measuring instrument; 520. Second temperature measuring instrument; 530. Second pressure measuring instrument; 540. Third pressure measuring instrument; 550. First pressure measuring instrument; 600. Gas storage tank; 701. Second control valve; 702. Third control valve; 703. First control valve; 704. Fourth control valve; 800. Gas collecting bottle. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0024] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0026] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0027] Please refer to Figure 1 In this specific embodiment, the battery internal volume and gas production measurement device includes a gas storage tank 600, a sealed box 100, a gas measuring and injecting device 300 and a pressure measuring pipeline. The gas storage tank 600 is provided with an inert gas; the sealed box 100 is configured to accommodate a battery cell 10; the sealed box 100 and the gas storage tank 600 are connected via a pressure regulating pipeline for regulating the internal pressure of the sealed box 100; the sealed box 100 is provided with a first temperature measuring instrument 510 for measuring the internal temperature of the sealed box 100; The gas measuring and injection device 300 is connected to the gas storage tank 600 via an air intake control pipeline; the pressure measuring pipeline is used to measure the pressure inside the battery cell 10, and the pressure measuring pipeline includes a gas collection tube 200, the gas collection tube 200 includes a plug-in portion and a connecting portion arranged away from the plug-in portion, the plug-in portion of the gas collection tube 200 is inserted into the sealed box 100 and is configured to be connected to the inside of the battery cell 10; the connecting portion of the gas collection tube 200 is connected and communicated with the gas measuring and injection device 300.

[0028] In this specific embodiment, the battery internal volume and gas production measurement device adjusts the pressure in the sealed box 100 by connecting the sealed box 100 and the gas storage tank 600, so that the pressure difference between the inside and outside of the battery is kept constant, so that the outer shell of the battery cell 10 will not be deformed, thereby not affecting the measurement of the internal volume of the battery cell 10; the sealed box 100 is provided with a first temperature measuring instrument 510 for measuring the internal temperature, and is connected to the inside of the battery cell 10 using a pressure measurement pipeline to measure the pressure inside the battery cell 10; the gas storage tank 600 is used to transmit inert gas to the inside of the battery cell 10, and the inert gas does not react with the substance inside the battery cell 10. The gas measuring and injection device 300 is not only used for connecting the gas storage tank 600 and the inside of the battery cell 10, but also has a gas measuring function, and can obtain volume, temperature and air pressure data. By directly reading the above parameters such as pressure, temperature and volume, the internal volume and gas production of the battery can be directly obtained, the measured data is more accurate and reliable, and the measurement method is more convenient and quick, which can improve the measurement accuracy and efficiency.

[0029] The above-mentioned inert gas can be specifically selected from nitrogen, helium, argon, etc., as long as it does not react with the internal substances of the battery cell 10, and there is no specific limitation here.

[0030] Specifically, after the battery cell 10 is placed, the first temperature measuring instrument 510 measures the internal temperature of the sealed box 100 to be T1 and the internal pressure to be P. m , the internal pressure of the battery cell 10 is P1, and the internal and external pressure difference of the battery cell 10 is △P=P1-P m , the internal volume V1 of the battery cell 10 is the parameter to be determined, n1 is the amount of gas substance inside the battery cell 10, which is also a parameter to be determined; then the gas measuring and injection device 300 is filled with the inert gas from the gas storage tank 600, the temperature measured inside the gas measuring and injection device 300 is T0, the gas pressure is P0, the gas volume is V0, and n0 is the amount of inert gas substance to be determined; then, the gas measuring and injection device 300 is pushed to inject the inert gas into the battery cell 10, and the pressure inside the sealed box 100 is adjusted to ensure that the pressure difference between the inside and outside of the battery cell 10 is equal to △P, and the internal pressure of the battery cell measured by the pressure measurement pipeline at this time is recorded as P2, and the internal temperature of the sealed box 100 measured by the first temperature measuring instrument 510 is T2. Then, the volume V1 inside the battery cell 10 and the gas production V of the battery cell are calculated by the following formula: 标 :

[0031] Before the inert gas is injected, the gas equation inside the battery cell 10 is:

[0032] P1V1=n1RT1

[0033] The injected inert gas satisfies the equation:

[0034] P0V0=n0RT0

[0035] After the inert gas is injected, the gas equation inside the battery cell 10 is:

[0036] P2V1=(n1+n0)RT2

[0037] Combining the above three equations, the volume inside the battery cell 10 is calculated to be V1:

[0038]

[0039] Under standard conditions, the air pressure is P 标 , temperature is T 标 , these two parameters are constants, and the gas production of the battery cell 10 under standard conditions can be calculated to be V 标 :

[0040]

[0041] By using the above formula, the volume inside the battery cell 10 and the gas generation of the battery cell 10 can be measured.

[0042] Furthermore, the pressure control pipeline includes a first pipeline, a first control valve 703 and a first pressure measuring instrument 550. The first pipeline connects the sealed box 100 and the gas tank 600. In the airflow direction from the gas tank 600 to the sealed box 100, the first pipeline is sequentially provided with the first control valve 703 and the first pressure measuring instrument 550. The first control valve 703 is used to open or close the first pipeline between the gas tank 600 and the sealed box 100, control the gas tank 600 to inject inert gas into the sealed box 100, and use the first pressure measuring instrument 550 to measure the gas pressure of the first pipeline, that is, to measure the gas pressure in the sealed box 100.

[0043] Optionally, the pressure measurement pipeline further includes a second control valve 701 and a second pressure measuring instrument 530; in the airflow direction from the connecting portion to the plug-in portion, the gas collection pipe 200 is sequentially provided with the second control valve 701 and the second pressure measuring instrument 530. The second control valve 701 is used to control the connection or closure between the pressure measurement pipeline and the inside of the battery cell 10, so that the second pressure measuring instrument 530 can accurately measure the pressure inside the battery cell 10.

[0044] Please continue to refer to Figure 1 The gas collection pipe 200 is connected to the gas collection bottle 800 through the third pipeline; the third pipeline is provided with a fourth control valve 704. When it is necessary to directly measure the gas production inside the battery cell 10, the fourth control valve 704 can be directly opened, and the gas generated inside the battery cell 10 directly enters the gas collection bottle 800 through the gas collection pipe 200 and the third pipeline. The user can directly measure the gas parameters in the gas collection bottle 800 to obtain the gas production of the battery cell 10.

[0045] Furthermore, the end of the plug-in portion of the gas collection tube 200 is a tip portion, which is used to pierce the outer shell of the battery cell 10 so that the gas collection tube 200 can be more conveniently connected to the inside of the battery cell 10 .

[0046] In this specific embodiment, the battery internal volume and gas production measurement device also includes a rubber sealing plug, which is configured to seal the gas collection hole of the battery cell 10; the plug-in portion of the gas collection tube 200 passes through the rubber sealing plug. The rubber sealing plug can ensure that the plug-in portion of the gas collection tube 200 and the outer shell of the battery cell 10 remain sealed to prevent gas leakage from the connection. Specifically, AB glue or other types of adhesives can be used to stick the rubber sealing plug to the safety valve, the battery shell of the injection hole or other gas collection areas to prevent leakage during the measurement process, making the measurement more accurate.

[0047] Please refer to Figure 2 In this specific embodiment, the gas measuring and gas injection device 300 includes a gas measuring cylinder 310 and a pushing member 400. A piston 401 is provided in the gas measuring cylinder 310. The piston 401 divides the inner cavity of the gas measuring cylinder 310 into a first cavity and a second cavity. The first cavity of the gas measuring cylinder 310 is connected to the gas storage tank 600 through the air intake control pipeline, and the first cavity of the gas measuring cylinder 310 is connected to the connecting part of the gas collection pipe 200. The gas measuring cylinder 310 is provided with a second temperature measuring instrument 520 for measuring the temperature of the first cavity of the gas measuring cylinder 310 and a third pressure measuring instrument 540 for measuring the pressure of the first cavity of the gas measuring cylinder 310. One end of the pushing member 400 is in the second cavity of the gas measuring cylinder 310 and is connected to the piston 401. The other end of the pushing member 400 passes through the gas measuring cylinder 310. The piston 401 not only divides the inner cavity of the gas cylinder 310 into a first cavity and a second cavity, but also can push the piston 401 to move so that the gas below the cavity is injected into the battery, which is simple and convenient to operate; the second temperature measuring instrument 520 is used to measure the temperature of the gas in the gas cylinder 310, and the third pressure measuring instrument 540 is used to measure the pressure of the gas in the gas cylinder 310, so as to directly obtain the gas parameters in the gas cylinder 310 and improve the measurement efficiency and accuracy.

[0048] Optionally, the above-mentioned gas cylinder 310 includes a bottle body 311, a first end plate 312 and a second end plate 313, and the above-mentioned bottle body 311 is provided with openings at both ends along its length direction, and the first end plate 312 and the second end plate 313 respectively seal the openings at both ends of the above-mentioned bottle body 311; the above-mentioned piston 401 is slidably arranged in the above-mentioned bottle body 311 along the length direction of the above-mentioned bottle body 311; the above-mentioned first end plate 312 is provided with a first through hole 3121 connected to the connecting part of the above-mentioned gas collection pipe 200 and a second through hole 3122 connected to the above-mentioned intake control pipeline; the above-mentioned second end plate 313 is provided with a third through hole 3131 that slidably cooperates with the above-mentioned push member 400. When in use, the air intake control pipeline first injects inert gas into the bottle body 311 through the second through hole 3122. At this time, the piston 401 and the pusher 400 are close to the second end plate 313 together. After the gas injection is completed, the pusher 400 slides in the third through hole 3131 of the second end plate 313 and pushes the piston 401 close to the second end plate 313. The third through hole 3131 can ensure the smooth movement of the pusher 400 and the piston 401. The piston 401 injects the inert gas in the bottle body 311 into the gas collection tube 200 and the inside of the battery cell 10 through the first through hole 3121.

[0049] Optionally, the outer circumference of the body 311 of the gas cylinder 310 is provided with scales. It is conceivable that the outer circumference of the body 311 of the gas cylinder 310 is provided with scales, and the volume of the gas in the gas cylinder 310 can be directly read according to the position of the piston 401 during use, and the data of the gas volume in the gas cylinder 310 can be obtained more conveniently.

[0050] Combination Figure 1 and Figure 2 Further, the air intake control pipeline includes a second pipeline and a third control valve 702. The second pipeline connects the first cavity of the gas cylinder 310 and the gas storage tank 600. The second pipeline is provided with a third control valve 702. The third control valve 702 can control the on-off of the second pipeline, so that when the piston 401 injects the inert gas in the bottle body 311 into the battery cell 10, the second pipeline is disconnected to maintain the airtightness of the first cavity, prevent excess inert gas from entering the gas cylinder 310 from the gas storage tank 600, and ensure the accuracy of measurement.

[0051] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A device for measuring the internal volume and gas production of a battery, characterized in that: include: A gas storage tank (600), wherein an inert gas is arranged in the gas storage tank (600); A sealed box (100), the sealed box (100) being configured to accommodate a battery cell (10); the sealed box (100) and the gas storage tank (600) being connected via a pressure regulating pipeline for regulating the internal pressure of the sealed box (100); the sealed box (100) being provided with a first temperature measuring instrument (510) for measuring the internal temperature of the sealed box (100); A gas measuring and injecting device (300), wherein the gas measuring and injecting device (300) and the gas storage tank (600) are connected via an air intake control pipeline; A pressure measuring pipeline, the pressure measuring pipeline is used to measure the pressure inside the battery cell (10), the pressure measuring pipeline comprises a gas collection pipe (200), the gas collection pipe (200) comprises a plug-in portion and a connecting portion arranged away from the plug-in portion, the plug-in portion of the gas collection pipe (200) is inserted into the sealing box (100) and is configured to communicate with the inside of the battery cell (10); the connecting portion of the gas collection pipe (200) is connected and communicated with the gas measuring and injecting device (300).

2. The battery internal volume and gas production measuring device according to claim 1, characterized in that: The pressure regulating pipeline comprises a first pipeline, a first control valve (703) and a first pressure measuring instrument (550), wherein the first pipeline connects the sealing box (100) and the gas storage tank (600); in the air flow direction from the gas storage tank (600) to the sealing box (100), the first pipeline is provided with the first control valve (703) and the first pressure measuring instrument (550) in sequence.

3. The battery internal volume and gas production measuring device according to claim 1, characterized in that: The pressure measurement pipeline further comprises a second control valve (701) and a second pressure measuring instrument (530); in the airflow direction from the connecting portion to the plug-in portion, the gas collection pipe (200) is provided with the second control valve (701) and the second pressure measuring instrument (530) in sequence.

4. The battery internal volume and gas production measuring device according to claim 1, characterized in that: The gas measuring and injection device (300) comprises a gas measuring bottle (310) and a pushing member (400). A piston (401) is arranged in the gas measuring bottle (310). The piston (401) divides the inner cavity of the gas measuring bottle (310) into a first cavity and a second cavity. The first cavity of the gas measuring bottle (310) is connected to the gas storage tank (600) through the gas intake control pipeline, and the first cavity of the gas measuring bottle (310) is connected to the gas collection pipe (200). The connecting part is connected; the gas cylinder (310) is provided with a second temperature measuring instrument (520) for measuring the temperature of the first cavity of the gas cylinder (310) and a third pressure measuring instrument (540) for measuring the pressure of the first cavity of the gas cylinder (310); one end of the pushing member (400) is in the second cavity of the gas cylinder (310) and is connected to the piston (401); the other end of the pushing member (400) passes through the gas cylinder (310).

5. The battery internal volume and gas production measuring device according to claim 4, characterized in that: The gas cylinder (310) comprises a cylinder body (311), a first end plate (312) and a second end plate (313); the cylinder body (311) is provided with openings at both ends along the length direction thereof; the first end plate (312) and the second end plate (313) respectively seal the openings at both ends of the cylinder body (311); the piston (401) is slidably arranged in the cylinder body (311) along the length direction of the cylinder body (311); the first end plate (312) is provided with a first through hole (3121) connected to a connecting portion of the gas collection tube (200) and a second through hole (3122) connected to the air intake control pipeline; the second end plate (313) is provided with a third through hole (3131) slidably matched with the pusher (400).

6. The battery internal volume and gas production measuring device according to claim 5, characterized in that: The outer peripheral surface of the bottle body (311) of the gas cylinder (310) is provided with scales.

7. The battery internal volume and gas production measuring device according to claim 4, characterized in that: The air intake control pipeline comprises a second pipeline and a third control valve (702); the second pipeline is connected to the first cavity of the gas cylinder (310) and the gas storage tank (600); and the second pipeline is provided with a third control valve (702).

8. The device for measuring the internal volume and gas production of a battery according to any one of claims 1 to 7, characterized in that: The gas collection pipe (200) is connected to the gas collection bottle (800) via a third pipeline; the third pipeline is provided with a fourth control valve (704).

9. The device for measuring the internal volume and gas production of a battery according to any one of claims 1 to 7, characterized in that: The end of the plug-in portion of the gas collection tube (200) is a tip end.

10. The device for measuring the internal volume and gas production of a battery according to any one of claims 1 to 7, characterized in that: It also comprises a rubber sealing plug, which is configured to seal the gas collection hole of the battery cell (10); the plug-in portion of the gas collection pipe (200) passes through the rubber sealing plug.

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