Battery cell detection device

Abstract

A detection device (20) for a battery cell (10) includes a detection stand (21), a heating device (22), and a detection device (23), in which the detection stand (21) is provided with a receiving cavity (21a) for receiving the battery cell (10), the heating device (22) is installed in the receiving cavity (21a) and heats the battery cell (10), and the detection device (23) is in communication with the receiving cavity (21a) and detects the gas components in the receiving cavity (21a) to determine whether an electrolyte of the battery cell (10) is leaking. The detection device disposes the battery cell (10) in the receiving cavity (21a) and uses a heating device (22) to heat the battery cell (10) in the receiving cavity (21a), thereby accelerating the evaporation of the electrolyte in the battery cell (10) where electrolyte leakage exists and releasing it into the receiving cavity (21a), thereby quickly and efficiently detecting whether electrolyte in the battery cell (10) is leaking without affecting the structure and performance of the battery cell (10) itself, and ensuring the safety of the battery cell (10).

Description

[Technical Field]

[0001] [CROSS-REFERENCE TO RELATED APPLICATIONS] This application claims priority to a Chinese patent application entitled "Battery Cell Detection Apparatus," application number 202122468097.7, filed on October 13, 2021, the entire contents of which are incorporated herein by reference.

[0002] The present application relates to the field of detection technology, and in particular to a detection device for a battery cell. [Background technology]

[0003] Battery cells are widely used in power-consuming devices such as mobile phones, laptops, battery cars, electric vehicles, electric aircraft, electric boats, electric toy cars, electric toy boats, electric toy aircraft, and power tools. Battery cells can include cadmium-nickel battery cells, nickel-metal hydride battery cells, lithium-ion battery cells, and secondary alkaline zinc-manganese battery cells.

[0004] In the development of battery technology, in addition to improving the performance of battery cells, safety issues cannot be ignored. If the safety issues of a battery cell cannot be addressed, the battery cell cannot be used. Therefore, how to ensure the safety of battery cells is a technical issue that must be resolved as soon as possible in battery technology. However, during the use of battery cells, safety issues arise due to electrolyte leakage. Therefore, how to ensure that electrolyte leakage does not occur in battery cell products is a technical issue that must be resolved as soon as possible in battery safety technology. Summary of the Invention

[0005] The present application provides a battery cell detection device that can detect whether an electrolyte in a battery cell is leaking or not, thereby ensuring the safety of the battery cell.

[0006] The present application provides a battery cell detection device including a detection stand provided with a receiving cavity for receiving a battery cell, a heating device installed in the receiving cavity for heating the battery cell, and a detection device communicating with the receiving cavity for detecting the composition of gas in the receiving cavity to determine whether an electrolyte of the battery cell is leaking.

[0007] The battery cell detection device provided in the embodiments of the present application is installed so that the battery cell is placed in a receiving cavity, and a heating device is used to heat the battery cell in the receiving cavity, thereby accelerating the evaporation of the electrolyte in the battery cell where electrolyte leakage exists and releasing it into the receiving cavity, thereby quickly and efficiently detecting whether or not electrolyte in the battery cell is leaking, and ensuring the safety of the battery cell, on the premise that the structure and performance of the battery cell itself is not affected.

[0008] In some embodiments, the detection device further includes a temperature control unit electrically connected to the heating device, for controlling and maintaining the temperature in the receiving cavity at a preset temperature, so that the heating device can easily adjust the heating temperature in real time and ensure that the temperature in the receiving cavity is maintained at the preset temperature.

[0009] In some embodiments, the preset temperature is between 60° C. and 100° C. On the premise of ensuring the chemical stability of the electrolyte in the battery cell, the discharge of the electrolyte in the battery cell is accelerated as much as possible.

[0010] In some embodiments, the detection platform includes a mounting platform and a cover, the cover is disposed over the mounting platform to form a receiving cavity, the cover has a communication port connecting the receiving cavity to the outside environment and a gas outlet, and the detection device has an inlet communicating with the gas outlet. During the process of allowing the gas in the receiving cavity to flow into the detection device through the gas outlet, the air pressure in the receiving cavity decreases. The communication port allows external air to enter the receiving cavity, preventing the external air from affecting the composition of the electrolyte in the receiving cavity and preventing the air pressure in the receiving cavity from becoming too low, thereby avoiding the occurrence of expansion and deformation of the battery cells, especially soft-pack battery cells.

[0011] In some embodiments, the detection device further includes an air pressure control unit communicating with the communication port and controlling the air pressure in the accommodating cavity to maintain it at a predetermined air pressure. Maintaining the air pressure in the accommodating cavity at the predetermined air pressure ensures that the gas in the accommodating cavity enters the detection device, making it easier to detect the gas in the accommodating cavity.

[0012] In some embodiments, the air pressure control unit includes an air supply device communicating with the communication port and supplying air into the accommodating cavity, and an air pressure detection device electrically connected to the air supply device, detecting air pressure information in the accommodating cavity and feeding the air pressure information in the accommodating cavity back to the air supply device, thereby maintaining a constant air pressure in the accommodating cavity and ensuring that the gas in the accommodating cavity enters the detection device through the gas outlet.

[0013] In some embodiments, the mounting table includes a base and a jig mounted on the base, a cover is provided over the base to form a receiving cavity, and the jig clamps the battery cell, which makes it easy to place the battery cell in the receiving cavity and to remove the battery cell from the receiving cavity after the detection is completed, effectively improving the production cycle time and the utilization rate of the detection device.

[0014] In some embodiments, the detection device includes a detection unit and a processing unit electrically connected to each other, the detection unit is in communication with the accommodating cavity and detects the gas components in the accommodating cavity, and the processing unit processes data on the detection result of the detection unit. With this configuration, the detection device can be equipped with a function to determine whether the electrolyte of the battery cell is leaking, making it easier for an operator to operate.

[0015] In some embodiments, the detection unit includes a gas chromatograph, which can detect most types of ester substances and has the advantages of high sensitivity, high efficiency, high selectivity, fast analysis speed, small sample amount required, etc.

[0016] In some embodiments, the detection apparatus further includes an exhaust device in communication with the accommodating cavity and the detection device, for delivering gas in the accommodating cavity to the detection device, thereby ensuring that the gas flow is directed out of the accommodating cavity, and components of the electrolyte leaking from the battery cell are likely to flow into the detection device.

[0017] The battery cell detection device provided in the embodiments of the present application is installed so that the battery cell is placed in a receiving cavity, and a heating device is used to heat the battery cell in the receiving cavity, thereby accelerating the evaporation of the electrolyte in the battery cell where electrolyte leakage exists and releasing it into the receiving cavity, thereby quickly and efficiently detecting whether or not electrolyte in the battery cell is leaking, and ensuring the safety of the battery cell, on the premise that the structure and performance of the battery cell itself is not affected. [Brief explanation of the drawings]

[0018] In order to more clearly describe the technical solutions in the embodiments of the present application, the following briefly describes the drawings required for the embodiments of the present application. It should be understood that the drawings shown below are only some embodiments of the present application, and those skilled in the art can further obtain other drawings based on the drawings without any creative efforts.

[0019] [Figure 1] 1 is a structural schematic diagram of a battery cell detected by a detection device disclosed in an embodiment of the present application. [Figure 2] 1 is a structural schematic diagram of a detection device disclosed in an embodiment of the present application; [Figure 3] FIG. 2 is a structural schematic diagram of a detection device disclosed in another embodiment of the present application. [Figure 4] FIG. 10 is a structural schematic diagram of a detection device disclosed in yet another embodiment of the present application. [Figure 5] FIG. 10 is a structural schematic diagram of a detection device disclosed in yet another embodiment of the present application. [Figure 6] FIG. 10 is a structural schematic diagram of a detection device disclosed in yet another embodiment of the present application. [Figure 7] FIG. 10 is a structural schematic diagram of a detection device disclosed in yet another embodiment of the present application. [Figure 8] FIG. 10 is a structural schematic diagram of a detection device disclosed in yet another embodiment of the present application. [Figure 9] FIG. 10 is a structural schematic diagram of a detection device disclosed in yet another embodiment of the present application.

[0020] In the drawings, the drawings are not drawn to scale. [Explanation of symbols]

[0021] 10 battery cells 11 Packaging 12 electrode lead wires, 20 Detection device 21 Detection table 21a Storage cavity 211 Mounting table 2111 Base 2112 Jig 212 Cover 212a Communication port 212b Gas outlet 22 Heating Devices 23 Detection Devices 23a intake 231 Detection Unit 232 Processing Unit 24 Temperature Control Unit 25 Pneumatic control unit 251 Air supply device 252 Air pressure detection device 26 Exhaust system 261 Exhaust control valve DETAILED DESCRIPTION OF THE INVENTION

[0022] The embodiments of the present application will be described in more detail below with reference to the drawings and examples. The detailed description of the following examples and the drawings are used to exemplify the principles of the present application, but are not intended to limit the scope of the present application, and the present application is not limited to the described examples.

[0023] It should be noted that in the description of this application, unless otherwise specified, "multiple" means two or more, and the orientations or positional relationships indicated by terms such as "up," "down," "left," "right," "inside," and "outside" are merely for ease of explanation and simplification of the description, and do not indicate or imply that the subject devices or elements have a particular orientation or should be configured and operated in a particular orientation, and therefore should not be understood as limiting the application. Furthermore, terms such as "first," "second," and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. "Perpendicular" does not mean perpendicular in the strict sense, but is within a tolerance range. "Parallel" does not mean parallel in the strict sense, but is within a tolerance range.

[0024] Any directional expressions appearing in the following description refer to the directions shown in the drawings and do not limit the specific structure of the present application. It should be further explained that, unless otherwise clearly specified and limited, the terms "attached," "connected," and "connect" should be understood in a broad sense, and may refer to, for example, a fixed connection, a detachable connection, or an integral connection. They may be directly connected or indirectly connected via an intermediate medium. Those skilled in the art can understand the specific meanings of the above terms in the present application according to specific circumstances.

[0025] In this application, the battery cell may include a lithium ion secondary battery, a lithium ion primary battery, a lithium-sulfur battery, a sodium lithium ion battery, a sodium ion battery, or a magnesium ion battery, etc., but the embodiments of this application are not limited thereto. The battery cell may be cylindrical, flat, rectangular, or have other shapes, etc., but the embodiments of this application are not limited thereto. Battery cells are generally divided into three types based on the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, but the embodiments of this application are not limited thereto.

[0026] Battery cells have advantages such as high energy density, high power density, many cycle times, and long storage time, and are commonly used in power-consuming devices. For example, the power-consuming devices may be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, power tools, etc. Vehicles may be gasoline-powered vehicles, natural gas-powered vehicles, or new energy vehicles, and new energy vehicles may be pure electric vehicles, hybrid vehicles, or range-extended vehicles. Spacecraft include aircraft, rockets, space shuttles, and spaceships. Electric toys include game consoles, electric car toys, electric boat toys, and electric aircraft toys, both stationary and mobile. Power tools include metal-cutting power tools, polishing power tools, assembly power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, electric impact drivers, concrete vibrators, and electric planers. After discovering the problem of electrolyte leakage during battery cell use, the inventors conducted analysis and research on the structure and operating environment of battery cells, as well as the assembly process of battery cells. The inventors realized that during the production process of battery cells before they are shipped, detection of whether or not there is leakage from the battery cells is often carried out by manual visual inspection, which not only has low production efficiency but can only detect leakage problems in battery cells that are visible to the naked eye, and cannot manually identify leakage problems in battery cells that are not visible to the naked eye, resulting in battery cells at risk of leakage entering the market and posing certain safety risks.

[0027] Based on the above problems discovered by the inventors, the inventors have improved the battery cell detection method, and the technical solutions described in the embodiments of this application are applied to the battery cell detection device.

[0028] As shown in FIG. 1 , the battery cell 10 includes a packaging pack 11, an electrode assembly housed in the packaging pack 11, and an electrode lead wire 12 connected to the electrode assembly and protruding outside the packaging pack 11.

[0029] The packaging pack 11 contains a container for containing the electrode assembly and the electrolyte. capacity A cavity is formed in the packaging pack 11. The shape of the packaging pack 11 can be determined depending on the specific shape of the electrode assembly.

[0030] The packaging pack 11 includes a first packaging film and a second packaging film, which are arranged one above the other, and the electrode assembly is placed between the first packaging film and the second packaging film. The first packaging film and the second packaging film may be separate or integral. For example, the first packaging film and the second packaging film may be formed by folding a single packaging film (e.g., aluminum laminate film, steel laminate film, etc.) in half.

[0031] Both the first packaging film and the second packaging film have a multi-layer structure. For example, both the first packaging film and the second packaging film include a protective layer, a metal layer, and a heat-sealing layer, and the protective layer and the heat-sealing layer are respectively provided on both sides of the metal layer. Specifically, the heat-sealing layer may be provided via an adhesive on the surface of the metal layer facing the electrode assembly, and the protective layer may be provided via an adhesive on the surface of the metal layer opposite the electrode assembly.

[0032] Preferably, the material of the protective layer may be nylon or polyethylene terephthalate, the material of the metal layer may be aluminum foil or steel foil, and the material of the heat seal layer may be polypropylene.

[0033] The first and second packaging films are connected to each other on the outside of the electrode assembly to form a sealed region, for example, by hot pressing the heat-seal layer of the first packaging film to the heat-seal layer of the second packaging film to form a sealed region.

[0034] 2 to 9 each show a different detection device 20 according to an embodiment of the present application.

[0035] 2, the battery cell detection device 20 according to the embodiment of the present application includes a detection base 21, a heating device 22, and a detection device 23. The detection base 21 is provided with a receiving cavity 21a for receiving the battery cell 10, and the heating device 22 is installed in the receiving cavity 21a and is used to heat the battery cell 10. The detection device 23 is in communication with the receiving cavity 21a and is used to detect the gas composition in the receiving cavity 21a to determine whether the electrolyte of the battery cell 10 is leaking.

[0036] Specifically, if there is no leakage from the battery cell 10, the gas in the accommodating cavity 21a may contain only a small amount of electrolyte components. Once electrolyte leaks from the battery cell 10, the electrolyte components in the accommodating cavity 21a increase exponentially. Therefore, the detection device 23 may detect the electrolyte components in the gas in the accommodating cavity 21a regardless of whether electrolyte leaks from the battery cell 10, but the difference may be orders of magnitude.

[0037] It should be noted that the process of determining whether the electrolyte of the battery cell 10 is leaking may be completed by the detection device 23 itself, or the detection device 23 may be installed only to detect the gas composition in the accommodating cavity 21a, and the existence of the electrolyte leakage phenomenon may be determined manually or by other devices.

[0038] For example, the detection device 23 itself is integrated with hardware for determining whether or not the electrolyte is leaking. For example, if the detection device 23 detects that the content of the electrolyte in the gas in the accommodating cavity exceeds a preset content, it issues an alarm. In other words, the detection device 23 itself has the ability to determine whether or not the electrolyte in the battery cell 10 is leaking.

[0039] If the detection device 20 detects that there is no electrolyte leakage problem in the battery cell 10, the battery cell 10 can be sent to the next process or can undergo the next operation. If leakage is detected in the battery cell 10, the battery cell 10 cannot proceed to the next process and is discarded or reprocessed.

[0040] The heating device 22 may be installed inside or outside the receiving cavity 21a as long as it can heat the battery cell 10 in the receiving cavity 21a. By installing the heating device 22 to heat the battery cell 10, if there is an electrolyte leak in the battery cell 10, the evaporation of the electrolyte components in the battery cell 10 can be accelerated and released into the receiving cavity 21a, which helps the detection device 23 to quickly detect the electrolyte components in the gas in the receiving cavity 21a.

[0041] The structure and shape of the detection stand 21 are not limited as long as it has a receiving cavity 21a capable of receiving a battery cell 10. The receiving cavity 21a may be sealed or may be connected to the outside. The receiving cavity 21a may receive only one battery cell 10, or multiple battery cells 10 may be received simultaneously. In an embodiment in which multiple battery cells 10 can be received in the receiving cavity 21a, if the detection device 20 does not detect a leakage problem in the battery cell 10, the battery cell 10 can be sent to the next process or the next operation can be performed. If an electrolyte leakage situation is detected in a battery cell 10, the battery cell 10 may be manually detected or the detection device 20 provided herein may be used as is, but the multiple battery cells 10 must be detected separately until a battery cell 10 with an electrolyte leakage is found.

[0042] The battery cell detection device 20 provided in the embodiment of the present application is installed so that the battery cell 10 is placed in the receiving cavity 21a, and a heating device 22 is used to heat the battery cell 10 in the receiving cavity 21a, thereby accelerating the evaporation of the electrolyte in the battery cell 10 where there is electrolyte leakage and releasing it into the receiving cavity 21a, thereby quickly and efficiently detecting whether or not there is electrolyte leakage in the battery cell 10 without affecting the structure and performance of the battery cell 10 itself, and ensuring the safety of the battery cell 10.

[0043] In some embodiments, as shown in FIG. 3, the detection apparatus 20 further includes a temperature control unit 24 electrically connected to the heating device 22 to control and maintain the temperature in the receiving cavity 21a at a preset temperature.

[0044] In addition, in order to quickly release the electrolyte in the battery cell 10 where the electrolyte leakage problem exists, the battery cell 10 needs to be heated to a higher temperature by the heating device 22, but a temperature that is too high will change the properties of the electrolyte in the battery cell 10, affecting the subsequent normal use of the battery cell 10. Therefore, a temperature control unit 24 needs to be provided to ensure that the battery cell 10 is maintained at an appropriate temperature.

[0045] Specifically, the temperature control unit 24 monitors the environmental temperature in the receiving cavity 21a in real time, and when it detects that the environmental temperature in the receiving cavity 21a is too high or too low, it sends a control signal to the heating device 22, allowing the heating device 22 to adjust the heating temperature in real time, and ensures that the temperature in the receiving cavity 21a is maintained at a preset temperature.

[0046] The specific numerical range of the preset temperature needs to be specifically set based on the specific type of battery cell 10 and the specific composition of the electrolyte in the battery cell 10, so as to accelerate the discharge of the electrolyte from the battery cell 10 as much as possible while ensuring the stability of the performance of the battery cell 10.

[0047] In some embodiments, the preset temperature is between 60°C and 100°C.

[0048] Specifically, in some examples, the preset temperature may be any one continuous range of 60°C to 100°C, such as 60°C to 80°C, 70°C to 90°C, 60°C to 70°C, or 70°C to 100°C. That is, the preset temperature may have an upper limit and a lower limit, and when the temperature in the accommodating cavity 21a exceeds the upper limit or falls below the lower limit, the temperature control unit 24 sends a control signal to the heating device 22, making it easy for the heating device 22 to adjust the heating temperature for the battery cell 10 in real time.

[0049] In another example, the preset temperature is any value between 60°C and 100°C, for example, the preset temperature is 60°C, 70°C, 80°C, 90°C or 100°C. In this case, a temperature control unit 24 can be installed to give a temperature difference value to the preset temperature. When the temperature in the receiving cavity 21a exceeds or is lower than the tolerance of the preset temperature, the temperature control unit 24 sends a control signal to the heating device 22, facilitating the heating device 22 to adjust the heating temperature for the battery cell 10 in real time.

[0050] The preset temperature is set to 60° C. to 100° C., and the electrolyte in the battery cell 10 is released as quickly as possible under the premise that the chemical stability of the electrolyte in the battery cell 10 is ensured.

[0051] 4, the detection table 21 includes a mounting table 211 and a cover 212. The cover 212 covers the mounting table 211 to form a receiving cavity 21a. The cover 212 has a communication port 212a and a gas outlet port 212b. The communication port 212a is used to connect the receiving cavity 21a to the external environment. The detection device 23 has an inlet port 23a connected to the gas outlet port 212b.

[0052] Specifically, the battery cell 10 to be detected is placed on the mounting table 211 and is located within the accommodating cavity 21a. The detector 20 is located outside the accommodating cavity 21a and communicates with the accommodating cavity 21a via the gas outlet 212b. During the detection process, gas within the accommodating cavity 21a is introduced into the detector 20 via the gas outlet 212b, causing the air pressure within the accommodating cavity 21a to decrease. The communication port 212a allows external air to enter the accommodating cavity 21a without affecting the composition of the electrolyte within the accommodating cavity 21a and preventing the air pressure within the accommodating cavity 21a from becoming too low, thereby preventing the battery cell 10, particularly a soft-pack battery cell 10, from expanding and deforming.

[0053] In some embodiments, as shown in FIG. 5, the detection device 20 further includes an air pressure control unit 25 that communicates with the communication port 212a and controls the air pressure in the receiving cavity 21a to maintain it at a preset air pressure.

[0054] Specifically, the air pressure control unit 25 can detect the air pressure in the receiving cavity 21a, and when the air pressure in the receiving cavity 21a becomes lower than a preset air pressure, the air is let into the detection device 20 through the communication port 212a. Note that, by maintaining the air pressure in the receiving cavity 21a at the preset air pressure, it is ensured that the gas in the receiving cavity 21a enters the detection device 23, making it easier to detect the gas in the receiving cavity 21a.

[0055] In some embodiments, as shown in FIG. 6, the air pressure control unit 25 includes an air supply device 251 that communicates with the communication port 212a and supplies air to the receiving cavity 21a, and an air pressure detection device 252 that is electrically connected to the air supply device 251, detects air pressure information within the receiving cavity 21a, and feeds the air pressure information within the receiving cavity 21a back to the air supply device 251. 2 and , including.

[0056] Specifically, the air pressure detection device 252 can monitor air pressure information within the accommodating cavity 21a in real time and feed it back to the air supply device 251. When the air pressure within the accommodating cavity 21a drops below a preset pressure, the air supply device 251 injects more air into the accommodating cavity 21a to maintain a constant air pressure within the accommodating cavity 21a and ensure that gas within the accommodating cavity 21a enters the detection device 23 through the gas outlet 212b. For example, the air supply device 251 injects dry, clean air that has been dried and filtered into the accommodating cavity 21a, thereby reducing the possibility that the gas entering the accommodating cavity 21a will corrode the battery cells 10.

[0057] The battery cell 10 may be placed directly in the receiving cavity 21a, or may be clamped by a specific jig 2112 and then placed in the receiving cavity 21a.

[0058] In some embodiments, as shown in FIG. 7 , the mounting base 211 includes a base 2111 and a jig 2112 installed on the base 2111, the cover 212 is arranged to cover the base 2111 to form an accommodating cavity 21a, and the jig 2112 is used to clamp the battery cell 10.

[0059] Furthermore, by placing the battery cell 10 so that it is clamped between the jigs 2112, it is easy to place the battery cell 10 in the storage cavity 21a, and it is also easy to remove the battery cell 10 from the storage cavity 21a after detection is complete, which effectively improves the production takt time and improves the utilization rate of the detection device 20.

[0060] In some embodiments, as shown in FIG. 8, the detection device 23 includes a detection unit 231 and a processing unit 232 electrically connected to each other, the detection unit 231 communicates with the accommodating cavity 21a and is used to detect the gas components in the accommodating cavity 21a, and the processing unit 232 is used to perform data processing on the detection result of the detection unit 231.

[0061] Specifically, the detection unit 231 transmits the detected gas components and the content of each component in the accommodating cavity 21a to the processing unit 232, and the processing unit 232 determines whether the accommodating cavity 21a contains electrolyte components based on the gas components and the content of each component in the accommodating cavity 21a, and determines whether the electrolyte in the battery cell 10 is leaking based on the content of the electrolyte components.

[0062] Since the detection device 23 is installed to include the detection unit 231 and the processing unit 232, the detection device 23 can be equipped with the function of determining whether the electrolyte in the battery cell 10 is leaking, making it easier for the worker to operate.

[0063] The electrolyte of the battery cell 10 contains multiple components, and the detection unit 231 may be configured to detect only a specific component in the electrolyte, or may be configured to detect multiple components in the electrolyte.

[0064] In some embodiments, the detection unit 231 includes a gas chromatograph.

[0065] In addition, most of the components electrolyzed in most battery cells 10 are ester substances such as ethylene carbonate, and since gas chromatographs can detect most types of ester substances, they can be used to detect most battery cells 10, improving the versatility of the battery cell detection device 20. In addition, gas chromatographs have advantages such as high sensitivity, high efficiency, high selectivity, fast analysis speed, and small sample volume requirements.

[0066] In addition, the gas in the storage cavity 21a may be caused to flow into the detection device 23 by increasing the air pressure in the storage cavity 21a, or by applying negative pressure to the detection device 23.

[0067] In some embodiments, as shown in FIG. 9, the detection apparatus 20 further includes an exhaust device 26 in communication with the accommodating cavity 21a and the detection device 23, for delivering gas within the accommodating cavity 21a to the detection device 23.

[0068] Specifically, the exhaust device 26 communicates with the gas outlet 212b and maintains a low vacuum state within the accommodating cavity 21a by generating negative pressure, thereby ensuring that the gas flow flows out of the accommodating cavity 21a, and the components of the electrolyte leaked from the battery cell 10 easily flow into the detection device 23.

[0069] In some embodiments, the exhaust device 26 includes an exhaust control valve 261 that controls the opening and closing of the exhaust device 26 and the flow rate of the gas discharged from the exhaust device 26, thereby facilitating more accurate detection of the gas in the containing cavity 21a.

[0070] Although the present application has been described with reference to preferred embodiments, various modifications may be made and the elements may be replaced with equivalents without departing from the scope of the present application, and in particular, the technical features mentioned in each embodiment may be combined in any manner as long as there is no structural contradiction. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. a detection base (21) provided with a receiving cavity (21a) for receiving the battery cell (10); a heating device (22) installed in the receiving cavity (21a) and configured to heat the battery cells; a detection device (23) communicating with the receiving cavity (21 a) and detecting the gas content in the receiving cavity (21 a) to determine whether the electrolyte of the battery cell (10) is leaking; a communication port (212a) for communicating the storage cavity (21a) with an external environment; The detection device (23) includes a detection unit (231) and a processing unit (232) electrically connected to each other, the detection unit (231) communicates with the receiving cavity (21 a) and detects the components and content of the gas in the receiving cavity (21 a), the processing unit (232) performs data processing on the detection result of the detection unit (231), and the detected gas component is ethylene carbonate; The detection device (20) for a battery cell, wherein the detection unit (231) includes a gas chromatograph.

2. 2. The detection apparatus (20) of claim 1, further comprising a temperature control unit (24) electrically connected to the heating device (22) for controlling and maintaining a temperature within the receiving cavity (21 a) at a preset temperature.

3. The detection device (20) of claim 2, wherein the preset temperature is between 60°C and 100°C.

4. The detection table (21) includes a mounting table (211) and a cover (212), the cover (212) is provided to cover the mounting table (211) to form the storage cavity (21a), and the cover (212) has the communication port (212a) and a gas outlet port (212b), 2. The detection apparatus (20) of claim 1, wherein the detection device (23) has an inlet (23a) in communication with the gas outlet (212b).

5. 5. The detection device (20) according to claim 4, further comprising an air pressure control unit (25) communicating with the communication port (212a) and controlling the air pressure in the receiving cavity (21a) to maintain it at a preset air pressure.

6. The air pressure control unit (25) an air supply device (251) communicating with the communication port (212a) and supplying air to the receiving cavity (21a); The detection device (20) according to claim 5, further comprising: an air pressure detection device (252) electrically connected to the air supply device (251), detecting air pressure information within the storage cavity (21 a), and feeding back the air pressure information within the storage cavity (21 a) to the air supply device (251).

7. The detection device (20) described in any one of claims 4 to 6, wherein the mounting table (211) includes a base (2111) and a jig (2112) installed on the base (2111), the cover (212) is arranged to cover the base (2111) to form the accommodating cavity (21a), and the jig (2112) clamps the battery cell (10).

8. The detection device (20) according to any one of claims 1 to 6, further comprising an exhaust device (26) communicating with the accommodating cavity (21 a) and the detection device (23) and supplying gas in the accommodating cavity (21 a) to the detection device (23).

Images