Battery gas detection device

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery gas detection device which comprises a gas taking module, a cooling module and a measuring module, the gas taking module comprises a gas taking pipe, one end of the gas taking pipe is communicated with pressure regulating equipment, and the other end of the gas taking pipe can be hermetically connected to a liquid injection hole of the to-be-tested battery; the cooling module comprises a first connecting pipe and a cooling chamber, the interior of the cooling chamber is hollow to form a cooling cavity, the first connecting pipe communicates with the air taking pipe and the cooling cavity, and the pressure regulating equipment can selectively output negative pressure to the air taking pipe and the cooling cavity; the measuring module comprises a second connecting pipe and a U-shaped pipe, one end of the U-shaped pipe is communicated with the cooling cavity through the second connecting pipe in an on-off mode, and fluid is contained in the U-shaped pipe. The battery gas detection device can be used for collecting and measuring the gas produced by the battery, and quantitatively testing and dynamically monitoring the gas production rate of the battery.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery gas detection device. Background Art

[0002] Secondary batteries, due to their high energy density, long cycle life, and lack of memory effect, are widely used in new energy vehicles, portable electronic devices, and energy storage devices. Formation is a crucial step in battery manufacturing, forming a passivation layer, the solid electrolyte interface (SEI), on the surface of the negative electrode.

[0003] The battery formation process produces gases such as CO2, CH4, C2H2, and H2. The amount of these gases produced directly affects the battery's charge and discharge reactions and the quality of the SEI film. The quality of the film directly affects the battery's electrochemical properties, such as cycle life, self-discharge performance, and safety. Different formation processes produce varying amounts of gas, forming different SEI films and significantly impacting battery performance. Furthermore, the battery's lithium replenishment process also produces gases. The amount of gas produced during this process is a measure of the complete reaction of the lithium replenisher. Rapid and accurate analysis of the generated gases helps improve battery quality and prevent the generation of gases during later cycles that could cause battery expansion and explosion. Utility Model Content

[0004] The purpose of the utility model is to provide a battery gas detection device, which can collect and measure the gas produced by the battery, and perform quantitative testing and dynamic monitoring on the gas production of the battery.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] A battery gas detection device, comprising:

[0007] An air extraction module, comprising an air extraction pipe, one end of which is connected to a pressure regulating device, and the other end of which is sealably connected to a liquid injection hole of a battery to be tested;

[0008] A cooling module includes a first connecting pipe and a cooling chamber, wherein the interior of the cooling chamber is hollow to form a cooling cavity, the first connecting pipe connects the air intake pipe and the cooling cavity, and the pressure regulating device can selectively output negative pressure to the air intake pipe and the cooling cavity;

[0009] The measuring module includes a second connecting pipe and a U-shaped pipe. One end of the U-shaped pipe is connected to the cooling cavity in an on-off manner through the second connecting pipe. The U-shaped pipe contains fluid.

[0010] Optionally, the cooling chamber includes a first shell and a second shell, the first shell is arranged outside the second shell, the inner cavity of the second shell is the cooling cavity, a cooling channel is formed between the first shell and the second shell, and a coolant is provided in the cooling channel.

[0011] Optionally, the cooling module further includes a liquid inlet pipe and a liquid outlet pipe, and the liquid inlet pipe and the liquid outlet pipe are respectively arranged on both sides of the first shell and are respectively connected to the cooling channel.

[0012] Optionally, the cooling module further includes a temperature detecting element, which is disposed on the cooling chamber and is used to detect the temperature in the cooling cavity.

[0013] Optionally, the cooling module further includes a pressure detecting component, which is provided on the first connecting pipe and is used to detect the gas pressure in the first connecting pipe.

[0014] Optionally, the cooling module further includes a first valve, which is provided on the first connecting pipe and can control the on-off of the gas in the first connecting pipe.

[0015] Optionally, the other end of the U-shaped tube is closed to form a vacuum end.

[0016] Optionally, the measurement module further includes a second valve, which is provided on the second connecting pipe and can control the on-off of the gas in the second connecting pipe.

[0017] Optionally, the fluid in the U-shaped tube is mercury; and / or,

[0018] The color of the fluid in the U-shaped tube is different from the color of the U-shaped tube.

[0019] Optionally, a nozzle is provided at one end of the air extraction pipe connected to the battery to be tested, and the diameter of the nozzle is larger than the aperture of the liquid injection hole of the battery to be tested.

[0020] Optionally, the air extraction module further includes a third valve, which is arranged on the air extraction pipe. The connection point between the first connecting pipe and the air extraction pipe is located between the third valve and the nozzle. The third valve can control the on and off of the gas in the air extraction pipe.

[0021] Beneficial effects of the utility model:

[0022] In the battery gas detection device provided by the present invention, the pressure regulating device outputs negative pressure to the air extraction pipe and the cooling chamber, which can not only evacuate the excess air in the device, but also balance the pressure inside the battery to be tested and the cooling chamber, making the gas detection more accurate. The gas generated by the battery to be tested first flows into the cooling chamber through the air extraction pipe and is cooled in the cooling chamber to reduce the detection error and improve the accuracy of the gas production measurement of the battery to be tested. The cooled gas flows to the U-shaped tube, causing a level difference in the liquid surface at both ends of the U-shaped tube. By reading the scale value on the U-shaped tube, the gas production of the battery to be tested can be accurately calculated. At the same time, the U-shaped tube can also collect the gas produced by the battery to be tested for subsequent analysis of the gas composition. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0024] Figure 1 This is a schematic structural diagram of a battery gas detection device provided by an embodiment of the present utility model;

[0025] Figure 2 It is a structural schematic diagram of the cooling chamber provided by an embodiment of the present utility model.

[0026] In the picture:

[0027] 100. Battery to be tested;

[0028] 1. Air extraction module; 11. Air extraction pipe; 12. Nozzle; 13. Third valve;

[0029] 2. Cooling module; 21. First connecting pipe; 22. Cooling chamber; 221. Cooling cavity; 222. First shell; 223. Second shell; 224. Cooling channel; 225. Liquid inlet pipe; 226. Liquid outlet pipe; 23. Temperature detection element; 24. Pressure detection element; 25. First valve;

[0030] 3. Measuring module; 31. Second connecting pipe; 32. U-shaped tube; 321. Vacuum end; 33. Second valve. DETAILED DESCRIPTION

[0031] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0032] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0034] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0035] In the description of the present utility model, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0036] It should also be noted that, in the description of this utility model, unless otherwise specified or limited, the terms "disposed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0037] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0038] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0039] This embodiment provides a battery gas detection device, which can be used to collect and measure the gas generated during the battery formation process or lithium replenishment process. Figure 1 As shown, the battery gas detection device includes a gas extraction module 1, a cooling module 2 and a measurement module 3.

[0040] Specifically, the air extraction module 1 includes an air extraction pipe 11, one end of which is connected to a pressure regulating device, and the other end of the air extraction pipe 11 can be sealed and connected to the injection hole of the battery under test 100. The pressure regulating device can be a device such as an air pump that can output positive or negative pressure. By connecting the pressure regulating device to the air extraction pipe 11, the air pressure in the air extraction pipe 11 is regulated.

[0041] Furthermore, a nozzle 12 is provided at one end of the gas extraction tube 11 connected to the battery under test 100. The diameter of the nozzle 12 is larger than the diameter of the liquid injection hole of the battery under test 100, so that the nozzle 12 can cover the outside of the liquid injection hole. This ensures a tight connection between the nozzle 12 and the battery casing around the liquid injection hole of the battery under test 100, preventing gas generated by the battery under test 100 from escaping from the connection between the gas extraction tube 11 and the battery under test 100, thereby affecting the accuracy of the measurement.

[0042] Optionally, the gas extraction module 1 further includes a third valve 13. The third valve 13 is provided on the gas extraction pipe 11 and can control the on-off of the gas in the gas extraction pipe 11. The third valve 13 can control the connection between the gas extraction pipe 11 and the pressure regulating device. When the pressure regulating device is needed to extract gas from the gas extraction pipe 11, the third valve 13 is opened; when the battery 100 to be tested produces gas, the third valve 13 is closed to prevent the gas from flowing out of the gas extraction pipe 11, affecting the accuracy of the measurement, and reducing the amount of gas collected. Exemplarily, the third valve 13 can be a solenoid valve or a manual valve.

[0043] Continue to refer to Figure 1 , the cooling module 2 includes a first connecting pipe 21 and a cooling chamber 22. The interior of the cooling chamber 22 is hollow to form a cooling cavity 221. The first connecting pipe 21 connects the air intake pipe 11 and the cooling cavity 221. The connection point between the first connecting pipe 21 and the air intake pipe 11 is located between the third valve 13 and the nozzle 12; the pressure regulating device can selectively output negative pressure to the air intake pipe 11 and the cooling cavity 221. It is understandable that before collecting and measuring the gas production of the battery 100 to be tested, a negative pressure is first output to the air intake pipe 11 and the cooling cavity 221 through the pressure regulating device until the air intake pipe 11 and the cooling cavity 221 slowly return to zero pressure, and the operation is repeated at least twice. It can not only evacuate excess air in the device, but also balance the pressure inside the battery 100 to be tested and the cooling cavity 221, making the gas detection more accurate. In this embodiment, the pressure regulating device is an air pump, which can pump negative pressure into the air intake pipe 11 and the cooling chamber 221, and the negative pressure range is -40KPa to -80KPa.

[0044] Specifically, if Figure 2 As shown, the cooling chamber 22 includes a first shell 222 and a second shell 223. The first shell 222 is sleeved on the outside of the second shell 223, and the inner cavity of the second shell 223 is the cooling chamber 221. A cooling channel 224 is formed between the first shell 222 and the second shell 223, and a coolant is provided in the cooling channel 224. Since the temperature of the gas generated by the battery 100 to be tested is relatively high, directly measuring the high-temperature gas will result in large errors. Therefore, by providing a cooling module 2, the gas generated by the battery 100 to be tested first flows into the cooling chamber 221 through the air intake pipe 11, and heat exchanges with the coolant in the cooling channel 224 in the cooling chamber 221. Cooling the high-temperature air generated by the battery 100 to be tested to room temperature or standard atmospheric pressure temperature can help reduce detection errors and improve the accuracy of measuring the gas production of the battery 100 to be tested. In this embodiment, the cooling module 2 can reduce the temperature of the high-temperature gas generated by the battery 100 to be tested to 25°C.

[0045] More specifically, to ensure coolant fluidity and improve heat exchange efficiency, the cooling module 2 further includes an inlet pipe 225 and an outlet pipe 226. The inlet pipe 225 and outlet pipe 226 are disposed on either side of the first housing 222 and are connected to the cooling channel 224. The coolant flows into the cooling channel 224 through the inlet pipe 225, flows within the cooling channel 224, and exchanges heat with the high-temperature gas within the cooling chamber 221. The heated coolant then flows out through the outlet pipe 226.

[0046] Preferably, the cooling module 2 further includes a temperature detecting element 23, which is provided on the cooling chamber 22 and is used to detect the temperature in the cooling cavity 221. In this embodiment, the temperature detecting element 23 can be a device capable of measuring temperature, such as a temperature sensor or a thermometer.

[0047] Preferably, the cooling module 2 further includes a pressure detection member 24, which is disposed on the first connecting tube 21 and is used to detect the gas pressure within the first connecting tube 21. The pressure detection member 24 enables a preliminary assessment of the gas production volume and rate of the battery 100 under test, thereby facilitating reasonable control of the opening and closing times of the cooling module 2. For example, the pressure detection member 24 can be a pressure valve as known in the art.

[0048] More specifically, the cooling module 2 further includes a first valve 25. The first valve 25 is provided on the first connecting pipe 21 and can control the on-off of the gas in the first connecting pipe 21. Exemplarily, the first valve 25 can be a solenoid valve or a manual valve.

[0049] Continue to refer to Figure 1 The measurement module 3 includes a second connecting tube 31 and a U-shaped tube 32. One end of the U-shaped tube 32 is openably connected to the cooling chamber 221 via the second connecting tube 31, and the U-shaped tube 32 contains a fluid. Utilizing the principle of a barometer, the cooled gas flows into the U-shaped tube 32, causing a level difference between the two ends of the U-shaped tube 32. By reading the scale value on the U-shaped tube 32, the gas production of the battery 100 under test can be accurately calculated. The U-shaped tube 32 also collects the gas produced by the battery 100 under test for subsequent analysis of the gas composition.

[0050] Specifically, in this embodiment, the fluid within the U-shaped tube 32 is mercury. The other end of the U-shaped tube 32 is sealed, forming a vacuum end 321. The vacuum state does not exert pressure on the mercury within the U-shaped tube 32, thereby better ensuring measurement accuracy. Furthermore, the vacuum end 321 helps prevent mercury from evaporating into the air, reducing safety risks. Of course, in other embodiments, the color of the fluid within the U-shaped tube 32 is different from the color of the U-shaped tube 32, so as to facilitate reading the liquid level difference between the two ends of the U-shaped tube 32.

[0051] More specifically, the measurement module 3 further includes a second valve 33. The second valve 33 is provided on the second connecting pipe 31 and can control the on-off of the gas in the second connecting pipe 31. For example, the second valve 33 can be a solenoid valve or a manual valve.

[0052] Taking the measurement of gas production during the formation process of the battery 100 to be tested as an example, the detection steps of the battery gas production detection device provided in this embodiment are described as follows:

[0053] First, place the battery 100 to be tested in the formation cabinet, open the third valve 13 and the first valve 25, and close the second valve 33. After aligning and sealing the nozzle 12 with the injection hole of the battery 100 to be tested, use the pressure regulating device to pump the negative pressure of the air extraction pipe 11 and the cooling chamber 221 to -40kPa to -80kPa, and then slowly return it to 0kPa (which can be observed through the pressure detection device 24). Repeat this process at least twice. The purpose of pumping the negative pressure is to extract the gas inside the electrode and rebalance the pressure in the battery cavity, the air extraction pipe 11, and the cooling chamber 221.

[0054] Then, the second valve 33 is kept closed, and the third valve 13 and the first valve 25 are closed to form the battery 100 under test. During the formation process, gas is generated in the battery 100 under test, and the pressure of the generated gas can be observed by the pressure detection element 24. When the pressure is greater than 0.1 MPa, the first valve 25 is opened; when the pressure returns to 0 or close to 0 MPa, the first valve 25 is immediately closed. This cycle is repeated multiple times. When the pressure on the pressure detection element 24 no longer changes, the liquid inlet pipe 225 of the cooling module 2 injects coolant into the cooling channel 224.

[0055] Finally, when the temperature sensor 23 indicates that the gas in the cooling chamber 221 has cooled to 25°C, the second valve 33 is opened and the first valve 25 is closed. As the gas flows out, the mercury in the U-shaped tube 32 experiences a height difference due to atmospheric pressure. By reading the scale on the U-shaped tube 32, the amount of gas generated by the battery under test 100 can be calculated.

[0056] 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. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A battery gas detection device, characterized in that: include: An air extraction module (1) comprises an air extraction pipe (11), one end of the air extraction pipe (11) is connected to a pressure regulating device, and the other end of the air extraction pipe (11) can be sealed and connected to a liquid injection hole of a battery to be tested (100); A cooling module (2) comprises a first connecting pipe (21) and a cooling chamber (22); the cooling chamber (22) is hollow inside to form a cooling cavity (221); the first connecting pipe (21) is in communication with the air intake pipe (11) and the cooling cavity (221); and the pressure regulating device is capable of selectively outputting negative pressure to the air intake pipe (11) and the cooling cavity (221); The measuring module (3) comprises a second connecting tube (31) and a U-shaped tube (32), one end of the U-shaped tube (32) is connected to the cooling chamber (221) in an on-off manner through the second connecting tube (31), and the U-shaped tube (32) contains fluid.

2. The battery gas detection device according to claim 1, characterized in that: The cooling chamber (22) includes a first shell (222) and a second shell (223), wherein the first shell (222) is sleeved outside the second shell (223), and the inner cavity of the second shell (223) is the cooling chamber (221). A cooling channel (224) is formed between the first shell (222) and the second shell (223), and a coolant is provided in the cooling channel (224).

3. The battery gas detection device according to claim 2, characterized in that: The cooling module (2) further comprises a liquid inlet pipe (225) and a liquid outlet pipe (226); the liquid inlet pipe (225) and the liquid outlet pipe (226) are respectively arranged on both sides of the first shell (222) and are respectively connected to the cooling flow channel (224).

4. The battery gas detection device according to claim 2, characterized in that: The cooling module (2) further comprises a temperature detection component (23), which is arranged on the cooling chamber (22) and is used to detect the temperature in the cooling cavity (221).

5. The battery gas detection device according to claim 2, characterized in that: The cooling module (2) further comprises a pressure detection component (24), which is arranged on the first connecting pipe (21) and is used to detect the gas pressure in the first connecting pipe (21).

6. The battery gas detection device according to claim 2, characterized in that: The cooling module (2) further comprises a first valve (25), which is arranged on the first connecting pipe (21) and is capable of controlling the on-off of the gas in the first connecting pipe (21).

7. The battery gas detection device according to any one of claims 1 to 6, characterized in that: The other end of the U-shaped tube (32) is closed to form a vacuum end (321).

8. The battery gas detection device according to claim 7, characterized in that: The measuring module (3) further comprises a second valve (33), which is arranged on the second connecting pipe (31) and can control the on-off of the gas in the second connecting pipe (31).

9. The battery gas detection device according to claim 7, characterized in that: The fluid in the U-shaped tube (32) is mercury; and / or, The color of the fluid in the U-shaped tube (32) is different from the color of the U-shaped tube (32).

10. The battery gas detection device according to any one of claims 1 to 6, characterized in that: One end of the air extraction pipe (11) connected to the battery to be tested (100) is provided with a glue nozzle (12), and the diameter of the glue nozzle (12) is larger than the aperture of the injection hole of the battery to be tested (100).

11. The battery gas detection device according to claim 10, characterized in that: The gas extraction module (1) further comprises a third valve (13), the third valve (13) being arranged on the gas extraction pipe (11), the connection point between the first connecting pipe (21) and the gas extraction pipe (11) being located between the third valve (13) and the nozzle (12), and the third valve (13) being capable of controlling the on-off of the gas in the gas extraction pipe (11).

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