WO2024065811A1

WO2024065811A1 - Battery cell, battery and electric device

Info

Publication number: WO2024065811A1
Application number: PCT/CN2022/123592
Authority: WO
Inventors: 张继君; 朱翠翠; 王少飞; 魏奕民; 欧阳楚英
Original assignee: 宁德时代新能源科技股份有限公司
Priority date: 2022-09-30
Filing date: 2022-09-30
Publication date: 2024-04-04
Also published as: CN116802884A

Abstract

Embodiments of the present application provide a battery cell, a battery and an electric device. The battery cell comprises: a housing provided with an accommodating space; an electrode assembly provided in the accommodating space, wherein a gas is generated in the accommodating space when the electrode assembly works; a gas sensor at least partially arranged in the accommodating space and used for detecting the gas; and a transmission assembly connected to the gas sensor and used for transmitting a signal of the gas sensor.

Description

Battery cells, batteries and electrical devices

Technical Field

The present application relates to the field of battery technology, and in particular to a battery cell, a battery and an electrical device.

Background technique

Generally speaking, the gas environment inside the battery cell is an important factor affecting the safety performance of the battery cell, so it is crucial to detect the gas environment inside the battery cell. In the related art, the gas generated inside the battery cell is often collected into a specific detection cavity through a gas duct, and then the gas in the detection cavity is detected by a gas detection device. However, the current detection method itself usually affects the gas environment inside the battery cell when exporting the gas, resulting in a deviation between the detection result and the actual gas environment inside the battery cell. It can be seen that in the related art, the internal gas environment of the battery cell is often difficult to detect accurately.

Summary of the invention

The embodiments of the present application provide a battery cell, a battery, and an electrical device to solve the technical problem that the internal gas environment of the battery cell is often difficult to accurately detect.

In a first aspect, an embodiment of the present application provides a battery cell, including:

A housing having a receiving space;

The electrode assembly is disposed in the accommodation space, and when the electrode assembly is in operation, gas is generated in the accommodation space;

A gas sensor, at least partially disposed in the accommodation space, for detecting gas;

The transmission component is connected to the gas sensor and is used for transmitting the signal of the gas sensor.

The embodiment of the present application disposes at least part of the gas sensor in the accommodation space inside the shell, so that the gas sensor can directly perform detection inside the battery cell without affecting the actual gas environment inside the battery cell, and then transmits its signal to the signal processing device through the transmission component to analyze the real-time gas environment inside the battery cell. Real-time in-situ detection of the gas type and concentration inside the battery cell can be achieved to improve the accuracy of the detection result.

Optionally, in some embodiments, the gas sensor includes at least one of a semiconductor gas sensor, an electrochemical gas sensor, and an infrared gas sensor.

This embodiment can realize real-time in-situ detection of the type and concentration of gas inside the battery cell by at least one of a semiconductor gas sensor, an electrochemical gas sensor and an infrared gas sensor implanted inside the battery cell, so as to improve the accuracy of the detection result.

Optionally, in some embodiments, the semiconductor gas sensor comprises:

substrate;

A sensor electrode is disposed on the substrate;

The sensitive material layer is arranged on the substrate and connected to the sensor electrode. The sensitive material layer includes at least one sensitive material, and each sensitive material is used to detect a gas.

In this embodiment, different sensitive materials in the semiconductor gas sensor have different responses to different types of gases, and the same sensitive material has different responses to different concentrations of the same gas. Therefore, according to the change in the resistance value output by the sensor electrode, real-time in-situ detection of the gas type inside the battery cell and the concentration data corresponding to each type of gas can be achieved.

Optionally, in some embodiments, the sensitive material layer includes a plurality of sensitive material film layers, and the plurality of sensitive material film layers are distributed in an array on the substrate.

In this way, based on the resistance value output by the sensor electrode corresponding to each sensitive material film layer and its position arrangement pattern, the error value that may be caused by cross-sensitivity can be analyzed through an algorithm, and then the concentration data corresponding to various types of gases can be obtained more accurately.

Optionally, in some embodiments, the electrochemical gas sensor comprises:

Sensing electrode and counter electrode;

A separator is disposed between the sensing electrode and the counter electrode;

The lead-out electrode is connected to the sensing electrode and the counter electrode for outputting signals.

In this embodiment, the separator can separate the sensing electrode and the counter electrode, and different gases can undergo redox reactions with the sensing electrode and the counter electrode. If the sensing electrode oxidizes the gas, the counter electrode reduces some chemical substances, and if the sensing electrode reduces the gas, the counter electrode oxidizes some chemical substances. Based on this, different current value changes can be generated according to different reactions of different gases, so the gas types inside the battery cell and the concentration data corresponding to various types of gases can be detected in real time in situ according to the current value output by the extraction electrode.

Optionally, in some embodiments, the electrochemical gas sensor further comprises:

A reference electrode is provided with a separator between the reference electrode and the sensing electrode or the counter electrode, and the reference electrode is connected to the extraction electrode.

In this embodiment, a reference electrode can be introduced to keep the potential of the reference electrode and the sensing electrode fixed to prevent the electrochemical reaction of the sensing electrode from continuing and the electrode potential from being unable to remain constant. The reference electrode effectively improves the performance of the electrochemical gas sensor, thereby effectively improving the accuracy of the gas detection results.

Optionally, in some embodiments, the infrared gas sensor comprises:

An infrared light source is disposed in the accommodating cavity;

The infrared detection module is arranged in the accommodating cavity. The infrared detection module is opposite to the infrared light source and is arranged at a distance. The infrared detection module is used to detect the wavelength and light intensity of the infrared light absorbed by the gas.

This embodiment can detect the type of gas inside the battery cell and the concentration data corresponding to each type of gas in real time in situ by using the wavelength and intensity of infrared light after being absorbed by the gas detected by the infrared detection module in the infrared gas sensor.

Optionally, in some embodiments, the infrared detection module includes:

N filters are arranged opposite to the infrared light source and at intervals, where N is a positive integer;

The N infrared detectors correspond to the N optical filters one by one and are arranged on a side of the N optical filters away from the infrared light source.

In this way, the light intensity corresponding to different wavelengths can be detected through the combination of N filters and N infrared detectors, and then the various types of gases inside the battery cell and the concentration data corresponding to each type of gas can be detected.

Optionally, in some embodiments, the infrared gas sensor further comprises:

an optical cavity having an inlet and an outlet for a gas;

Wherein, the infrared light source and the infrared detection module are arranged in the optical cavity.

In this embodiment, the infrared light source emits infrared light, which is reflected multiple times in the optical cavity to increase the optical path. The gas can enter the optical cavity from the entrance, absorb the infrared light of a specific wavelength emitted by the infrared light source in the optical cavity, and then leave the optical cavity from the exit. In this way, the optical cavity can increase the optical path of the infrared light, and improve the absorption rate of the gas absorbing infrared light of a specific wavelength, so that the wavelength and light intensity of the infrared light absorbed by the gas detected by the infrared detection module in the optical cavity are more accurate, thereby improving the accuracy of gas detection.

Optionally, in some embodiments, the inlet is arranged at a position of the optical cavity close to the infrared light source, and the outlet is arranged at a position of the optical cavity close to the infrared detection module.

In this way, the gas can fully absorb the infrared light of the corresponding wavelength in the optical cavity, making the result detected by the infrared detection module more accurate, thereby further improving the accuracy of gas detection inside the battery.

Optionally, in some embodiments, the housing comprises:

The first inner wall is an inner wall of the shell corresponding to the flow direction of the gas, and the gas sensor is arranged on the first inner wall.

In this embodiment, the gas sensor can be arranged on the first inner wall of the housing corresponding to the flow direction of the gas, so that the gas sensor can fully contact the gas for detection, further improving the accuracy of the detection result.

Optionally, in some embodiments, the first inner wall is an end cap assembly. It is understandable that the surface of the end cap assembly facing the electrode assembly usually has some protruding structures, and when the sensor is arranged on the end cap assembly, it can usually be located in a relatively concave area, so that there is no need to increase the installation space of the gas sensor, which effectively saves the internal space of the battery cell.

Optionally, in some embodiments, the end cap assembly comprises:

End cap body;

The explosion-proof valve and the electrode terminal are arranged at intervals on the end cover body, and the gas sensor is arranged in the area between the explosion-proof valve and the electrode terminal on the end cover body.

In this embodiment, the explosion-proof valve and the electrode terminal are usually raised from the surface of the end cover body facing the electrode assembly, and the gas sensor can be arranged in the area between the explosion-proof valve and the electrode terminal on the end cover body, which can effectively save the internal space of the battery cell.

Optionally, in some embodiments, a liquid injection hole is provided on the end cap assembly, and the position of the gas sensor is staggered from the position of the liquid injection hole, so that the gas sensor can be effectively prevented from affecting the subsequent liquid injection process of the battery cell.

Optionally, in some embodiments, the end cap assembly comprises:

End cap body;

The explosion-proof valve is arranged on the end cover body, and the gas sensor is arranged on the area of the end cover body corresponding to the explosion-proof valve.

In this embodiment, the gas sensor can be set in the area corresponding to the explosion-proof valve on the end cover body, and the explosion-proof valve area can be directly modified to enable the gas sensor to be installed without adjusting the position of other components of the end cover assembly, making the implantation of the gas sensor simpler and more convenient.

Optionally, in some embodiments, the end cap assembly comprises:

End cap body;

The lower plastic is arranged on the end cover body, the lower plastic protrudes from the first surface of the end cover body facing the electrode assembly, the lower plastic has a second surface intersecting with the first surface, and the gas sensor is arranged on the second surface.

In this embodiment, the lower plastic protrudes from the first surface of the end cover body facing the electrode assembly, and the gas sensor can be directly set on the second surface where the lower plastic intersects the first surface. This can effectively save the internal space of the battery cell. At the same time, there is no need to make corresponding adjustments to other components on the end cover assembly, making the implantation of the gas sensor simpler and more convenient.

Optionally, in some embodiments, the housing comprises:

A housing body having an opening;

An end cover assembly connected to the housing body and closing the opening;

The gas sensor is arranged on the inner wall of the shell body.

In this embodiment, the gas sensor can be directly arranged on the inner wall of the shell body according to needs, which effectively improves the flexibility of the installation position of the gas sensor.

Optionally, in some embodiments, the battery cell further comprises:

The power supply component is connected to the gas sensor and is used to provide electrical energy to the gas sensor.

In this way, the gas sensor can work normally on the basis of the power supply component providing it with electric energy, thereby realizing real-time detection of the gas environment inside the battery cell.

Optionally, in some embodiments, the housing is provided with a first through hole, and the power supply assembly includes a power supply line, one end of the power supply line is connected to the gas sensor, and the other end passes through the first through hole for connection to an external power source independent of the battery cell.

In this embodiment, the gas sensor can be provided with electric energy through an external power supply line, so that the gas sensor can work normally and realize the real-time detection of the gas environment inside the battery cell.

Optionally, in some embodiments, the power supply assembly includes a power supply interface, which is disposed on the housing and connected to the gas sensor, and the power supply interface is used to connect an external power source independent of the battery cell.

In this embodiment, a power supply interface can be provided on the housing to connect an external power source to provide power to the gas sensor, so that the gas sensor can work normally and achieve real-time detection of the gas environment inside the battery cell.

Optionally, in some embodiments, the electrode assembly is connected to the gas sensor, and the electrode assembly is a power supply assembly.

In this embodiment, the battery cell can directly power the gas sensor without an external power supply, that is, no hole modification is required on the shell to meet the power supply requirements for normal operation of the gas sensor. The structure is simpler and the sealing performance of the battery cell is better.

Optionally, in some embodiments, the housing is provided with a second through hole, and the transmission component includes a transmission line, one end of the transmission line is connected to the gas sensor, and the other end of the transmission line passes through the second through hole for connection with the signal processing device.

In this embodiment, the signal of the gas sensor can be transmitted to the signal processing device through an external transmission line to analyze the real-time gas environment inside the battery cell.

Optionally, in some embodiments, the transmission component includes a transmission interface, which is disposed on the housing and connected to the gas sensor, and the transmission interface is used to connect to the signal processing device.

In this embodiment, a transmission interface can be provided on the housing to connect to a signal processing device, so that the signal of the gas sensor can be transmitted to the signal processing device, thereby facilitating analysis of the real-time gas environment inside the battery cell.

Optionally, in some embodiments, the transmission component is a wireless transmission module, and the wireless transmission module is disposed in the accommodating space.

In this embodiment, the signal of the gas sensor can be transmitted through the wireless transmission module, and the signal transmission requirements of the gas sensor can be met without any hole modification on the shell. The structure is simpler and the sealing performance of the battery cell is better.

Optionally, in some embodiments, the housing includes a first inner wall, which is an inner wall of the housing corresponding to the flow direction of the gas, and the gas sensor and the wireless transmission module are both arranged on the first inner wall. In this way, the wireless transmission module effectively enhances the signal strength of the gas sensor by being on the same inner wall as the gas sensor, thereby ensuring the integrity and accuracy of the transmitted signal of the gas sensor, and further improving the accuracy of gas detection inside the battery.

In a second aspect, an embodiment of the present application further provides a battery, comprising a battery cell as in the first aspect.

In a third aspect, an embodiment of the present application further provides an electrical device, comprising a battery as in the second aspect, the battery being used to provide electrical energy.

The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.

FIG1 is a schematic diagram of a structure of a battery cell provided in an embodiment of the present application;

FIG2 is another schematic diagram of the structure of a battery cell provided in an embodiment of the present application;

FIG3 is a schematic diagram of the structure of a semiconductor gas sensor provided in an embodiment of the present application;

FIG4 is a schematic diagram of the structure of an electrochemical gas sensor provided in an embodiment of the present application;

FIG5a is one of the structural schematic diagrams of the infrared gas sensor provided in an embodiment of the present application;

FIG5b is a second schematic diagram of the structure of the infrared gas sensor provided in an embodiment of the present application;

FIG6a is one of the schematic diagrams of the position relationship of the gas sensors provided in the embodiment of the present application;

FIG6b is a side view of the positional relationship of the gas sensors in FIG6a;

FIG7a is a second schematic diagram of the position relationship of the gas sensors provided in an embodiment of the present application;

FIG7b is a partial side view of the positional relationship of the gas sensors in FIG7a;

FIG8a is a third schematic diagram of the position relationship of the gas sensors provided in the embodiment of the present application;

FIG8b is a partial side view of the positional relationship of the gas sensors in FIG8a;

FIG9 is a schematic diagram of the structure of a gas detection system provided in an embodiment of the present application;

FIG10 is a schematic diagram of a flow chart of a gas detection method for a battery cell provided in one embodiment of the present application;

FIG11 is a schematic structural diagram of a gas detection device for a battery cell provided in another embodiment of the present application;

FIG. 12 is a schematic diagram of the structure of an electronic device provided in yet another embodiment of the present application.

Reference numerals:

1. Shell; 11. Shell body; 12. End cap assembly; 121. End cap body; 1211. First surface; 122. Explosion-proof valve; 123. Electrode terminal; 124. Liquid injection hole; 125. Lower plastic; 1251. Second surface;

2. Gas sensor; 21. Semiconductor gas sensor; 211. Substrate; 212. Sensor electrode; 213. Sensitive material layer; 22. Electrochemical gas sensor; 221. Sensing electrode; 222. Counter electrode; 223. Separator; 224. Extraction electrode; 225. Reference electrode; 23. Infrared gas sensor; 231. Optical cavity; 232. Infrared light source; 233. Infrared detection module; 2331. Filter; 2332. Infrared detector;

3. Bare cell structure; 31. Electrode assembly;

901, battery cell; 902, data conversion device; 903, information processing device.

In the drawings, the drawings are not drawn to scale.

Detailed ways

The following detailed description and drawings of the embodiments of the present application are used to illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

In the description of the present application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present application 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 application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

In the present application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries, etc., and the embodiments of the present application do not limit this. Battery cells may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, and the embodiments of the present application do not limit this.

The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack. The battery generally includes a box for encapsulating one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

The battery cell includes an electrode assembly and an electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The current collector not coated with the positive electrode active material layer protrudes from the current collector coated with the positive electrode active material layer. The current collector not coated with the positive electrode active material layer is stacked as a positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide. The negative electrode sheet includes a negative electrode collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode collector. The current collector not coated with the negative electrode active material layer protrudes from the current collector coated with the negative electrode active material layer. The current collector not coated with the negative electrode active material layer is stacked as a negative electrode tab. The material of the negative electrode collector can be copper, and the negative electrode active material can be carbon or silicon. The material of the separator may be PP or PE, etc. In addition, the electrode assembly may be a winding structure or a stacked structure, but the embodiments of the present application are not limited thereto.

The applicant found that when detecting the gas environment inside the battery cell, part of the gas generated inside the battery cell is often collected into a specific detection cavity through a gas duct, and then the gas in the detection cavity is detected by a gas detection device. This detection method has certain defects: First, when the gas is extracted, it will usually affect the gas environment inside the battery cell, resulting in a deviation between the detection result and the actual gas environment inside the battery cell. Second, the detection process is relatively cumbersome, resulting in poor real-time detection of the gas environment inside the battery cell.

Based on the above problems discovered by the applicant, the applicant has improved the structure of the battery cell. The technical solution described in the embodiments of the present application is applicable to the battery cell, a battery including the battery cell, and an electrical device using the battery.

Please refer to FIG. 1 and FIG. 2 , which respectively provide two different battery cells according to an embodiment of the present application, wherein the battery cell may include:

The housing 1 has a receiving space;

A gas sensor 2, at least partially disposed in the accommodation space, for detecting gas;

The transmission component is connected to the gas sensor 2 and is used to transmit the signal of the gas sensor 2.

It is understood that the battery cell generally includes a housing 1 having a receiving space, and the receiving space can be used to receive a bare cell structure 3 composed of a positive electrode sheet, a negative electrode sheet, and an electrode assembly 31. The housing 1 may include a housing body 11 and an end cap assembly 12, wherein the housing body 11 has an open receiving space, and the end cap assembly 12 may be connected to the housing body 11 and close the opening of the housing body 11.

When the battery cell is being stored and charged and discharged, various gases will be generated inside the battery cell due to side reactions and other factors, causing the type and concentration of the gas inside the battery cell to change. By partially or completely arranging the gas sensor 2 in the accommodation space, the purpose of real-time and in-situ detection of the actual gas environment inside the battery cell can be achieved.

For example, as shown in Fig. 1, the gas sensor 2 may be disposed on the surface of the end cap assembly 12 facing the housing body 11, or as shown in Fig. 2, the gas sensor 2 may also be disposed on the inner wall of the housing body 11. In this way, the gas sensor 2 may be located in the accommodation space.

The battery cell may also include a transmission component connected to the gas sensor 2, and the transmission component may be used to transmit the signal of the gas sensor 2 to the signal processing device so that the signal processing device can analyze the real-time gas environment inside the battery cell. The transmission component may transmit the signal by wire or by wireless, which is not specifically limited here.

The embodiment of the present application disposes at least part of the gas sensor 2 in the accommodation space inside the housing 1, so that the gas sensor 2 can directly perform detection inside the battery cell without affecting the actual gas environment inside the battery cell, and then transmits its signal to the signal processing device through the transmission component to analyze the real-time gas environment inside the battery cell. Real-time in-situ detection of the gas type and concentration inside the battery cell can be achieved to improve the accuracy of the detection result.

Optionally, in some embodiments, the gas sensor 2 includes at least one of a semiconductor gas sensor 21 , an electrochemical gas sensor 22 , and an infrared gas sensor 23 .

In this embodiment, the gas sensor 2 implanted inside the battery cell may include one or more of a semiconductor gas sensor 21 , an electrochemical gas sensor 22 , and an infrared gas sensor 23 .

It is understandable that, if it is a semiconductor gas sensor 21, the resistance value output by the semiconductor gas sensor 21 can be converted into gas type data and concentration data corresponding to various types of gases, thereby realizing real-time in-situ detection of gas types and concentrations inside the battery cell.

If it is an electrochemical gas sensor 22, the current value output by the electrochemical gas sensor 22 can be converted into gas type data and concentration data corresponding to each type of gas, thereby achieving real-time in-situ detection of the gas type and concentration inside the battery cell.

If it is an infrared gas sensor 23, the wavelength and light intensity data output by the infrared gas sensor 23 can be converted into gas type data and concentration data corresponding to various types of gases, thereby realizing real-time in-situ detection of gas types and concentrations inside the battery cell.

This embodiment can realize real-time in-situ detection of the type and concentration of gas inside the battery cell by implanting at least one of the semiconductor gas sensor 21, the electrochemical gas sensor 22 and the infrared gas sensor 23 inside the battery cell, so as to improve the accuracy of the detection result.

Optionally, in some embodiments, the semiconductor gas sensor 21 includes:

Base 211;

The sensor electrode 212 is disposed on the substrate 211;

The sensitive material layer 213 is disposed on the substrate 211 and connected to the sensor electrode 212 . The sensitive material layer 213 includes at least one sensitive material, and each sensitive material is used to detect a gas.

In this embodiment, as shown in FIG. 3 , the semiconductor gas sensor 21 may include a base, a sensor electrode 212 and a sensitive material layer 213 , wherein the sensor electrode 212 and the sensitive material layer 213 may be disposed on the base, and the sensitive material layer 213 may be connected to the sensor electrode 212 .

The base supports the entire semiconductor gas sensor 21 structure and can be made of a non-conductive organic flexible material or a non-conductive inorganic material. The sensitive material layer 213 can react with the gas inside the battery cell. For example, when gases such as H2 and CO are generated inside the battery cell, these gases can react with the sensitive material layer 213, causing the resistance value of the sensitive material layer 213 to change.

It is understandable that the sensitive material layer 213 may include at least one sensitive material, and one sensitive material may react with one gas, so each sensitive material may be used to detect one gas. The sensor electrode 212 may be a component of the semiconductor gas sensor 21 that leads out the resistance signal, and may be made of a metal film. It is understandable that each sensitive material may correspond to a sensor electrode 212 (including a positive electrode and a negative electrode), so that the type of gas detected by the sensitive material and the concentration data corresponding to the type of gas may be obtained according to the resistance change of each sensitive material.

In one example, the sensitive material layer 213 in a semiconductor gas sensor 21 may include a sensitive material, based on which, multiple semiconductor gas sensors 21 may be implanted inside a battery cell, and each semiconductor gas sensor 21 may have a different sensitive material, thereby realizing detection of multiple types of gases inside the battery cell. In other examples, the sensitive material layer 213 in a semiconductor gas sensor 21 may also include multiple sensitive materials, so that implanting the semiconductor gas sensor 21 inside a battery cell can realize detection of multiple types of gases inside the battery cell.

In this embodiment, different sensitive materials in the semiconductor gas sensor 21 have different responses to different types of gases, and the same sensitive material has different responses to different concentrations of the same gas. Therefore, according to the change in the resistance value output by the sensor electrode 212, real-time in-situ detection of the gas type inside the battery cell and the concentration data corresponding to each type of gas can be achieved.

Optionally, in some embodiments, the sensitive material layer 213 includes a plurality of sensitive material film layers, and the plurality of sensitive material film layers are distributed in an array on the substrate 211 .

It is understandable that when the sensitive material layer 213 includes multiple sensitive materials, the gas inside the battery cell may be cross-sensitive, resulting in inaccurate detection results. Based on this, in this embodiment, the sensitive material layer 213 may include multiple sensitive material film layers, and the multiple sensitive material film layers are distributed in an array on the substrate 211. In this way, based on the resistance value output by the sensor electrode 212 corresponding to each sensitive material film layer and its position arrangement rule, the error value that may be caused by cross-sensitivity can be analyzed through an algorithm, and then the concentration data corresponding to various types of gases can be obtained more accurately.

Optionally, in some embodiments, the electrochemical gas sensor 22 includes:

A sensing electrode 221 and a counter electrode 222;

A separator 223 is disposed between the sensing electrode 221 and the counter electrode 222;

The lead-out electrode 224 is connected to the sensing electrode 221 and the counter electrode 222 for outputting signals.

In this embodiment, as shown in FIG4 , the electrochemical gas sensor 22 may include a sensing electrode 221, a counter electrode 222, a separator 223 and an extraction electrode 224. The sensing electrode 221 and the counter electrode 222 are separated by a separator 223. When gases such as CH4, CO, and CO2 are generated inside the battery cell, these gases can enter the electrochemical gas sensor 22 through micropores and reach the surface of the sensing electrode 221. Oxidation or reduction reactions occur on the sensing electrode 221, and the sensing electrode 221 gains or loses electrons, thereby generating a current value proportional to the gas concentration. The current value can then be provided to the extraction electrode 224 through the sensing electrode 221 and the counter electrode 222, and the extraction electrode 224 outputs the current value, and the concentration data of the measured gas can be determined based on the current value.

It is understandable that the overall reaction of the electrochemical gas sensor 22 is completed by the sensing electrode 221 and the counter electrode 222. If the sensing electrode 221 oxidizes the gas, the counter electrode 222 reduces some chemical substances; if the sensing electrode 221 reduces the gas, the counter electrode 222 oxidizes some chemical substances.

In this embodiment, different gases in the electrochemical gas sensor 22 undergo different oxidation or reduction reactions at the sensing electrode 221, which will produce different current changes. The current value is provided to the lead-out electrode 224 through the counter electrode 222. Therefore, according to the current value output by the lead-out electrode 224, real-time in-situ detection of the gas type inside the battery cell and the concentration data corresponding to each type of gas can be achieved.

Optionally, in some embodiments, the electrochemical gas sensor 22 further comprises:

A reference electrode 225 , a separator 223 is disposed between the reference electrode 225 and the sensing electrode 221 or the counter electrode 222 , and the reference electrode 225 is connected to the extraction electrode 224 .

In this embodiment, as shown in FIG. 4 , the electrochemical gas sensor 22 may further include a reference electrode 225 , wherein the reference electrode 225 is also separated from the sensing electrode 221 and the counter electrode 222 by a separator 223 .

It is understandable that in order to prevent the electrochemical reaction of the sensing electrode 221 from continuing, the potential of the counter electrode 222 also changes accordingly, so that the electrode potential of the sensing electrode 221 cannot be kept constant, thereby causing the performance of the electrochemical gas sensor 22 to degrade, affecting the accuracy of the gas detection result. In this embodiment, by introducing a reference electrode 225, during the operation of the electrochemical gas sensor 22, the potential of the reference electrode 225 and the sensing electrode 221 is kept fixed, and when the gas reacts with the sensing electrode 221, the current change on the counter electrode 222 is measured at the same time. The current change is directly related to the gas concentration, so that the concentration data of the measured gas can be obtained.

In this embodiment, the performance of the electrochemical gas sensor 22 can be improved by introducing a reference electrode 225, thereby effectively improving the accuracy of the gas detection result.

Optionally, in some embodiments, the infrared gas sensor 23 includes:

An infrared light source 232 is disposed in the accommodating cavity;

The infrared detection module 233 is disposed in the accommodating cavity. The infrared detection module 233 and the infrared light source 232 are opposite and spaced apart. The infrared detection module 233 is used to detect the wavelength and intensity of the infrared light after being absorbed by the gas.

In this embodiment, as shown in Figure 5a, the infrared gas sensor 23 can be arranged in the accommodating cavity with an infrared light source 232 and an infrared detection module 233, and the infrared detection module 233 is opposite to the infrared light source 232 and is arranged at intervals. For example, the infrared light source 232 and the infrared detection module 233 can be installed at intervals on the inner wall of the outer shell 1.

The infrared light source 232 can emit infrared light of preset light intensity and different wavelengths, the gas can absorb infrared light of a specific wavelength, and the infrared detection module 233 can detect the wavelength and light intensity of the infrared light absorbed by the gas. It is understandable that different types of gases absorb different wavelengths of infrared light, so the type of gas inside the battery cell and the concentration data corresponding to each type of gas can be detected based on the changes in the light intensity of infrared light of different wavelengths.

For example, take the detection of CO2 as an example. CO2 absorbs infrared light with a wavelength of 4.26um, and then the 4.26um filter 2331 is used in the infrared detection module 233 to allow the 4.26um infrared light to enter the infrared detector 2332, thereby obtaining the light intensity corresponding to the 4.26um infrared light. The light intensity is related to the absorption degree of CO2, that is, the light intensity is correlated with the concentration of CO2, so that different concentrations of CO2 entering the optical cavity 231 can be obtained through different light intensities, thereby realizing real-time detection of CO2.

This embodiment can detect the type of gas inside the battery cell and the concentration data of each type of gas in real time in situ by using the wavelength and intensity of infrared light after being absorbed by the gas detected by the infrared detection module 233 in the infrared gas sensor 23.

Optionally, in some embodiments, the infrared detection module 233 includes:

N filters 2331 are arranged opposite to the infrared light source 232 and spaced apart, where N is a positive integer;

The N infrared detectors 2332 correspond to the N filters 2331 one by one and are arranged on a side of the N filters 2331 away from the infrared light source 232 .

In this embodiment, the infrared detection module may include N filters 2331 and N infrared detectors 2332, wherein each filter 2331 can pass an infrared light of a corresponding wavelength, for example, filter A can pass infrared light of wavelength a, filter B can pass infrared light of wavelength b, and filter C can pass infrared light of wavelength c.

The N infrared detectors 2332 may correspond to the N filters 2331 one by one, and are arranged on the side of the N filters 2331 away from the infrared light source 232. In other words, each infrared detector 2332 may detect the intensity of infrared light of the wavelength passed by the corresponding filter 2331. For example, infrared detector A may detect the intensity of infrared light of wavelength a, infrared detector B may detect the intensity of infrared light of wavelength b, and infrared detector C may detect the intensity of infrared light of wavelength c.

In this way, the light intensity corresponding to different wavelengths can be detected through the combination of N filters 2331 and N infrared detectors 2332, and then various types of gases inside the battery cell and the concentration data corresponding to each type of gas can be detected.

Optionally, in some embodiments, the infrared gas sensor 23 may further include:

An optical cavity 231 having an inlet and an outlet for a gas;

The infrared light source 232 and the infrared detection module 233 are disposed in the optical cavity.

In this embodiment, as shown in FIG. 5 b , the infrared gas sensor 23 may include an optical cavity 231 , and an infrared light source 232 and an infrared detection module 233 disposed in the optical cavity 231 .

The optical cavity 231 has an inlet and an outlet for gas. The gas can enter the optical cavity 231 through the inlet, absorb infrared light of a specific wavelength in the optical cavity 231, and then exit through the outlet. The infrared light source 232 in the optical cavity 231 emits infrared light, which can be reflected multiple times by the optical cavity 231 to increase the optical path, thereby avoiding the situation where the gas has no time to absorb the infrared light due to the short optical path of the infrared light, and effectively improving the absorption rate of the gas absorbing infrared light of a specific wavelength. This makes the wavelength and light intensity of the infrared light absorbed by the gas detected by the infrared detection module in the optical cavity more accurate, thereby improving the accuracy of gas detection.

Optionally, in some embodiments, the inlet is disposed at a position of the optical cavity 231 close to the infrared light source 232 , and the outlet is disposed at a position of the optical cavity 231 close to the infrared detection module 233 .

In this embodiment, as shown in FIG. 5b , the inlet can be set at a position of the optical cavity 231 close to the infrared light source 232, and the outlet can be set at a position of the optical cavity 231 close to the infrared detection module 233. In this way, the gas can fully absorb the infrared light of the corresponding wavelength in the optical cavity 231, so that the result detected by the infrared detection module 233 is more accurate, thereby further improving the accuracy of gas detection inside the battery.

Optionally, in some embodiments, the housing 1 comprises:

The first inner wall is the inner wall of the housing 1 corresponding to the flow direction of the gas, and the gas sensor 2 is arranged on the first inner wall.

In this embodiment, it can be understood that since the gas generated inside the battery has a high temperature, it usually flows upward. Based on this, the uppermost inner wall of the housing 1 when the battery cell is placed can be used as the first inner wall. For example, if the battery cell is placed upright, the end cap assembly 12 of the housing 1 can be the first inner wall. If the battery cell is placed upside down, the bottom inner wall of the housing 1 opposite to the end cap assembly 12 can be the first inner wall. The gas sensor 2 can be arranged on the first inner wall of the housing 1 corresponding to the flow direction of the gas, so that the gas sensor 2 can fully contact the gas for detection, further improving the accuracy of the detection result.

Optionally, in some embodiments, the first inner wall is an end cap assembly 12 .

As shown in Fig. 6a to Fig. 8b, it can be understood that there are usually some protruding structures on the surface of the end cap assembly 12 facing the electrode assembly 31, such as the explosion-proof valve 122, the electrode terminal 123, the injection hole 124 and the lower plastic 125, all of which are protruding from the surface of the end cap assembly 12 facing the electrode assembly 31. The gas sensor 2 can be located in the relatively concave area between these protruding parts, so that there is no need to increase the installation space of the gas sensor 2, which effectively saves the internal space of the battery cell.

For example, for some gas sensors 2 with larger volumes, the surface of the end cap assembly 12 can also be adaptively designed, such as opening a groove for placing the gas sensor 2 on the surface of the end cap assembly 12. Alternatively, the end cap assembly 12 can be raised to accommodate the implantation of the gas sensor 2. It is understandable that since the end cap assembly 12 is raised, it usually involves lengthening the electrode terminal 123 of the end cap assembly 12 and the connecting piece of the positive electrode sheet and the negative electrode sheet. Alternatively, the positive electrode sheet and the negative electrode sheet can be shortened so that there is more space under the end cap assembly 12 to accommodate the gas sensor 2.

Optionally, in some embodiments, the end cap assembly 12 includes:

End cover body 121;

The explosion-proof valve 122 and the electrode terminal 123 are arranged at intervals on the end cover body 121 , and the gas sensor 2 is arranged in the area between the explosion-proof valve 122 and the electrode terminal 123 on the end cover body 121 .

In this embodiment, as shown in FIG6a and FIG6b, the end cap assembly 12 may include an end cap body 121, an explosion-proof valve 122, and an electrode terminal 123. The explosion-proof valve 122 and the electrode terminal 123 may be arranged at intervals on the end cap body 121, and the gas sensor 2 is arranged in the area between the explosion-proof valve 122 and the electrode terminal 123 on the end cap body 121, so that the gas sensor 2 can be located inside the battery cell, thereby realizing real-time in-situ detection of the type and concentration of gas inside the battery cell, and improving the accuracy of the detection result.

It can be understood that the explosion-proof valve 122 and the electrode terminal 123 are usually raised from the surface of the end cover body 121 facing the electrode assembly 31, and the gas sensor 2 is arranged in the area between the explosion-proof valve 122 and the electrode terminal 123 on the end cover body 121, which can effectively save the internal space of the battery cell.

It can also be understood that the electrode terminal 123 may include a positive terminal and a negative terminal, and the positive terminal and the negative terminal are respectively located on both sides of the explosion-proof valve 122, and the gas sensor 2 can be set in the area between the explosion-proof valve 122 and the positive terminal, and can also be set in the area between the explosion-proof valve 122 and the negative terminal, which is not specifically limited here.

Optionally, in some embodiments, a liquid injection hole 124 is provided on the end cover assembly 12 , and the position of the gas sensor 2 is staggered from the position of the liquid injection hole 124 .

As shown in Fig. 6a and Fig. 6b, the end cap assembly 12 is usually provided with a liquid injection hole 124. After the battery cell end cap assembly 12 is installed, electrolyte can be injected into the battery cell through the liquid injection hole 124. Based on this, the position of the gas sensor 2 can be staggered with the position of the liquid injection hole 124, which can effectively prevent the gas sensor 2 from affecting the subsequent liquid injection process of the battery cell.

Optionally, in some embodiments, the end cap assembly 12 includes:

End cover body 121;

The explosion-proof valve 122 is disposed on the end cover body 121 , and the gas sensor 2 is disposed on the end cover body 121 in a region corresponding to the explosion-proof valve 122 .

In this embodiment, as shown in Fig. 7a and Fig. 7b, the end cap assembly 12 may include an end cap body 121 and an explosion-proof valve 122. The gas sensor 2 is disposed in a region corresponding to the explosion-proof valve 122 on the end cap body 121, so that the gas sensor 2 can be located inside the battery cell, thereby achieving real-time in-situ detection of the type and concentration of gas inside the battery cell, thereby improving the accuracy of the detection result.

Please refer to FIG. 7b. Generally speaking, the explosion-proof valve 122 has a protrusion on the surface of the end cap body 121 facing the electrode assembly 31. The gas sensor 2 can be installed on one side of the protrusion, further saving the internal space of the battery cell. In addition, the gas sensor 2 is arranged in the area corresponding to the explosion-proof valve 122 on the end cap body 121. The explosion-proof valve 122 area can be directly modified to enable the gas sensor 2 to be installed, without adjusting the positions of other components of the end cap assembly 12, making the implantation of the gas sensor 2 simpler and more convenient.

Optionally, in some embodiments, the end cap assembly 12 includes:

End cover body 121;

The lower plastic 125 is disposed on the end cover body 121 . The lower plastic 125 protrudes from a first surface 1211 of the end cover body 121 facing the electrode assembly 31 . The lower plastic 125 has a second surface 1251 intersecting with the first surface 1211 . The gas sensor 2 is disposed on the second surface 1251 .

In this embodiment, as shown in FIG8a and FIG8b, lower plastics 125 can be provided at both ends of the end cap body 121, which can play a sealing role when the end cap assembly 12 is installed on the housing body 11. The lower plastic 125 usually protrudes from the first surface 1211 of the end cap body 121 facing the electrode assembly 31, and the gas sensor 2 can be directly provided on the second surface 1251 where the lower plastic 125 intersects with the first surface 1211, that is, the gas sensor 2 is provided on the side of the lower plastic 125, which can effectively save the internal space of the battery cell, and at the same time, there is no need to make corresponding adjustments to other components on the end cap assembly 12, so that the implantation of the gas sensor 2 is simpler and more convenient.

Optionally, in some embodiments, the housing 1 comprises:

The housing body 11 has an opening;

An end cover assembly 12 is connected to the housing body 11 and closes the opening;

The gas sensor 2 is disposed on the inner wall of the housing body 11 .

In this embodiment, as shown in FIG. 2 , the housing 1 may include a housing body 11 and an end cap assembly 12, wherein the housing body 11 has an open accommodation space, and the end cap assembly 12 may be connected to the housing body 11 and close the opening of the housing body 11. The gas sensor 2 may be disposed on the inner wall of the housing body 11, for example, may be disposed at one end of the inner wall close to the end cap assembly 12, so that the gas sensor 2 may be located inside the battery cell, thereby achieving real-time in-situ detection of the type and concentration of gas inside the battery cell, and improving the accuracy of the detection result. In this way, the gas sensor may be directly disposed on the inner wall of the housing body according to the requirements, effectively improving the flexibility of the installation position of the gas sensor.

Optionally, in some embodiments, the battery cell further comprises:

The power supply component is connected to the gas sensor 2 and is used to provide electrical energy to the gas sensor 2.

In this embodiment, the battery cell may further include a power supply component connected to the gas sensor 2, which may provide electrical energy to the gas sensor 2 so that the gas sensor 2 can work normally and realize real-time detection of the gas environment inside the battery cell.

It is understandable that the power supply assembly can be disposed inside the battery cell or outside the battery cell, which is not specifically limited here.

Optionally, in some embodiments, the housing 1 is provided with a first through hole, and the power supply assembly includes a power supply line, one end of the power supply line is connected to the gas sensor 2, and the other end passes through the first through hole for connection to an external power source independent of the battery cell.

In this embodiment, the power supply assembly may include a power supply line, one end of which is connected to the gas sensor 2, and the other end of which may be connected to an external power source independent of the battery cell. In other words, it is necessary to lead the power supply line from the inside of the battery cell to connect the external power source that provides power to the gas sensor 2. Based on this, a first through hole may be provided on the housing 1, and for example, a first through hole may be provided on the end cover assembly 12 so that the power supply line may pass through the first through hole. The external power source may be another battery, a mobile power source, or a powered socket, etc., which is not specifically limited here.

In this embodiment, the gas sensor 2 can be provided with electric energy through an external power supply line, so that the gas sensor 2 can work normally and realize the real-time detection of the gas environment inside the battery cell.

Optionally, in some embodiments, the power supply assembly includes a power supply interface, which is disposed on the housing 1 and connected to the gas sensor 2 , and is used to connect an external power source independent of the battery cell.

In this embodiment, the power supply assembly may include a power supply interface, which may be provided on the housing 1, for example, on the end cap assembly 12. The power supply interface may be connected to the gas sensor 2, and the power supply interface may be used to connect to an external power source independent of the battery cell, so that the external power source provides power to the gas sensor 2. The external power source may be other batteries, a mobile power source, or a powered socket, etc., which are not specifically limited here.

In this embodiment, a power supply interface can be provided on the housing 1 to connect an external power source to provide power to the gas sensor 2, so that the gas sensor 2 can work normally and achieve real-time detection of the gas environment inside the battery cell.

Optionally, in some embodiments, the electrode assembly 31 is connected to the gas sensor 2, and the electrode assembly 31 is a power supply assembly.

In this embodiment, as shown in FIG. 1 and FIG. 2 , the battery cell may further include an electrode assembly 31 disposed in the accommodation space, and the gas sensor 2 may be directly connected to the electrode assembly 31 so that the electrode assembly 31 provides electrical energy to the gas sensor 2. In other words, the battery cell may directly power the gas sensor 2 without an external power source, that is, without any hole modification to the housing 1, and the power supply requirement for the normal operation of the gas sensor 2 may be met, the structure is simpler, and the sealing performance of the battery cell is better.

Optionally, in some embodiments, the housing 1 is provided with a second through hole, and the transmission component includes a transmission line, one end of the transmission line is connected to the gas sensor 2, and the other end passes through the second through hole for connection with the signal processing device.

In this embodiment, the transmission component may include a transmission line (such as an optical fiber), one end of the transmission line is connected to the gas sensor 2, and the other end can be connected to the signal processing device. In other words, it is necessary to lead the transmission line from the inside of the battery cell to connect the signal processing device. Based on this, a second through hole can be opened on the housing 1, for example, a second through hole can be opened on the end cover assembly 12, so that the transmission line can pass through the second through hole.

It can be understood that, when the battery cell includes both a power supply line and a transmission line, the first through hole and the second through hole can be through holes respectively opened at different positions of the end cover assembly 12, and the first through hole and the second through hole can also be the same through hole. In other words, only one through hole is opened on the end cover assembly 12, and both the power supply line and the transmission line pass through the through hole.

In this embodiment, the signal of the gas sensor 2 can be transmitted to the signal processing device through an external transmission line to analyze the real-time gas environment inside the battery cell.

Optionally, in some embodiments, the transmission component includes a transmission interface, which is disposed on the housing 1 and connected to the gas sensor 2 , and the transmission interface is used to connect to the signal processing device.

In this embodiment, the transmission component may include a transmission interface, which may be provided on the housing 1, for example, on the end cap assembly 12. The transmission interface may be connected to the gas sensor 2, and the transmission interface may be used to connect to the signal processing device so that the signal processing device can analyze the real-time gas environment inside the battery cell.

In this embodiment, a transmission interface can be provided on the housing 1 to connect to a signal processing device, so that the signal of the gas sensor 2 can be transmitted to the signal processing device, thereby facilitating analysis of the real-time gas environment inside the battery cell.

In this embodiment, the transmission component can be a wireless transmission module, that is, the signal of the gas sensor 2 can be transmitted to the signal processing device by wireless transmission. The wireless transmission module can be arranged in the accommodation space, wherein the wireless transmission module can include wireless communication technology (WiFi) or Bluetooth technology, etc., which is not specifically limited here.

In this embodiment, the signal of the gas sensor 2 can be transmitted through the wireless transmission module, and the signal transmission requirements of the gas sensor 2 can be met without any hole modification of the housing 1. The structure is simpler and the sealing performance of the battery cell is better.

Optionally, in some embodiments, the housing 1 includes a first inner wall, which is an inner wall of the housing 1 corresponding to the flow direction of the gas, and the gas sensor 2 and the wireless transmission module are both arranged on the first inner wall.

For example, if the battery cell is placed upright, the first inner wall may be the end cap assembly 12, that is, the gas sensor 2 and the wireless transmission module may be disposed on the end cap assembly 12. In this way, the wireless transmission module is located on the same inner wall as the gas sensor 2, thereby effectively enhancing the signal strength of the gas sensor 2, thereby ensuring the integrity and accuracy of the transmitted signal of the gas sensor 2, and further improving the accuracy of gas detection inside the battery.

The embodiment of the present application also provides a battery, which may include any of the above-mentioned battery cells. It is understood that the battery mentioned in the embodiment of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack, etc. The battery generally includes a box for encapsulating one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

In a battery, there can be one or more battery cells. If there are multiple battery cells, the multiple battery cells can be connected in series, in parallel, or in a mixed connection. Mixed connection means that multiple battery cells are connected in series and in parallel. Multiple battery cells can be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by multiple battery cells is accommodated in a box. Alternatively, multiple battery cells can be first connected in series, in parallel, or in a mixed connection to form a battery module. Multiple battery modules are then connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in a box.

The embodiment of the present application also provides an electric device, which may include the above-mentioned battery, and the battery may be used to provide electrical energy. Among them, the electric device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like; the spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, and the like; the electric toy includes a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, and the like. The embodiment of the present application does not impose any special restrictions on the above-mentioned electric equipment.

As shown in FIG9 , the embodiment of the present application further provides a gas detection system, which may include:

The battery cell 901 includes a housing and a gas sensor, wherein the housing has a receiving space and the gas sensor is disposed in the receiving space;

The data conversion device 902 is connected to the gas sensor and is used to receive the target signal of the gas sensor and convert the target signal into corresponding gas data;

The signal processing device 903 is connected to the data conversion device 902 and is used to receive the gas data and analyze the gas environment inside the battery cell according to the gas data.

In the embodiment of the present application, when the battery cell 901 is stored and charged and discharged, various gases are generated inside the battery cell 901 due to factors such as side reactions, resulting in changes in the type and concentration of gases inside the battery cell 901. Based on this, the target signal inside the battery cell 901 can be collected by a gas sensor. For example, the resistance value corresponding to the resistance change can be collected by a semiconductor gas sensor, the current value corresponding to the current change can be collected by an electrochemical gas sensor, and the light intensity corresponding to the light intensity change of infrared light of different wavelengths can be collected by an infrared gas sensor.

After the target signal is collected, the target signal can be transmitted to the data conversion device 902. The data conversion device 902 can pre-store a relationship curve between the preset signal of the gas sensor and the gas data, wherein the gas data can include gas type and/or gas concentration data. The target signal can be automatically matched in the data conversion device, and the target signal can be directly converted into the corresponding target gas data.

The data conversion device 902 can transmit the gas data to the signal processing device 903, and the signal processing device 903 analyzes the gas environment inside the battery cell according to the gas data, so that when the gas environment does not meet the standard, relevant warnings can be made in time to effectively ensure the electrical performance and safety performance of the battery cell.

As shown in FIG. 10 , the embodiment of the present application may also provide a gas detection method for a battery cell. The battery cell includes a housing having a receiving space, and a gas sensor disposed in the receiving space. The gas detection method may include the following steps:

Step 1001, obtaining a target signal collected by a gas sensor.

In step 1001, the target signal inside the battery cell can be collected by a gas sensor. For example, the resistance value corresponding to the resistance change can be collected by a semiconductor gas sensor, the current value corresponding to the current change can be collected by an electrochemical gas sensor, and the light intensity corresponding to the light intensity change of infrared light of different wavelengths can be collected by an infrared gas sensor.

Step 1002, determining target gas data that matches the target signal according to a preset relationship curve, wherein the relationship curve includes a one-to-one correspondence between the gas sensor signal and the gas data, and the gas data includes gas type and/or gas concentration data.

In step 1002, a relationship curve between a preset signal of the gas sensor and the gas data may be pre-stored. After the target signal is acquired, matching may be performed according to the relationship curve to determine the target gas data corresponding to the target signal, wherein the target gas data may indicate a type of gas, a gas concentration, or a certain type of gas and the gas concentration corresponding to the type of gas.

Step 1003 , determining the gas environment detection result inside the battery cell according to the target gas data.

In step 1003, the gas environment inside the battery cell can be monitored in real time according to the target gas data, and it can be determined whether the gas environment meets the standard. If the gas environment does not meet the standard, relevant warnings can be issued in time to effectively ensure the electrical performance and safety performance of the battery cell.

In some embodiments, when the gas sensor is a semiconductor gas sensor, the target signal may be at least one resistance value, each resistance value carries first label information, and the first label information is used to indicate the sensitive material corresponding to the resistance value;

Determining target gas data matching the target signal according to the preset relationship curve may include the following steps:

Determine the gas type corresponding to the measured gas according to the first tag information;

The gas concentration corresponding to the measured gas is determined according to the resistance value.

In this embodiment, according to the characteristics of each sensitive material of the semiconductor gas sensor for detecting a gas, the relationship curve may include the corresponding relationship between the sensitive material and the gas type, and the corresponding relationship between the resistance value and the gas concentration under the gas type. The gas type corresponding to the measured gas can be determined according to the first tag information carried by the target signal, and the gas concentration corresponding to the measured gas can be determined according to the resistance value. For example, the larger the resistance value, the more intense the reaction between the measured gas and the surface of the sensitive material, which means that the gas concentration of the measured gas is higher.

In some embodiments, when the gas sensor is an electrochemical gas sensor, the target signal may be a current value;

The gas type and gas concentration corresponding to the measured gas are determined according to the current value.

In this embodiment, according to the characteristics that different gases can undergo oxidation or reduction reactions at the sensing electrode of the electrochemical gas sensor, the gas type and gas concentration corresponding to the measured gas can be determined according to the current value.

In some embodiments, when the gas sensor is an infrared gas sensor, the target signal may be at least one light intensity, and each resistance value carries second tag information, and the second tag information is used to indicate the wavelength of the infrared light corresponding to the light intensity;

Determine the gas type corresponding to the measured gas according to the second tag information;

The gas concentration corresponding to the measured gas is determined according to the light intensity.

In this embodiment, according to the characteristic that different types of gases in the infrared gas sensor can absorb infrared light of different wavelengths, the relationship curve may include the correspondence between the wavelength of infrared light and the type of gas, and the correspondence between the light intensity and the gas concentration under the gas type. The gas type corresponding to the measured gas can be determined based on the second tag information carried by the target signal, and the gas concentration corresponding to the measured gas can be determined based on the light intensity. For example, the smaller the light intensity, the more infrared light is absorbed by the measured gas, which means that the gas concentration of the measured gas is higher.

Based on the gas detection method for a battery cell provided in the above embodiment, the present application also provides an embodiment of a gas detection device for a battery cell.

FIG11 shows a schematic structural diagram of a gas detection device for a battery cell provided in another embodiment of the present application. For ease of explanation, only the portion related to the embodiment of the present application is shown.

As shown in FIG. 11 , a gas detection device 1100 for a battery cell provided in an embodiment of the present application, wherein the battery cell may include a housing having a receiving space, and a gas sensor disposed in the receiving space, and the gas detection device 1100 may include:

An acquisition module 1101 is used to acquire a target signal collected by a gas sensor;

A determination module 1102 is used to determine target gas data that matches the target signal according to a preset relationship curve, wherein the relationship curve includes a one-to-one correspondence between a preset signal of a gas sensor and gas data, and the gas data includes gas type and/or gas concentration data;

The detection module 1103 is used to determine the gas environment detection result inside the battery cell according to the target gas data.

In some embodiments, when the gas sensor is a semiconductor gas sensor, the target signal may be at least one resistance value, each resistance value carries first label information, and the first label information is used to indicate the sensitive material corresponding to the resistance value. The determination module 1102 may also be used to:

In some embodiments, when the gas sensor is an electrochemical gas sensor, the target signal may be a current value, and the determination module 1102 may also be used to:

In some embodiments, when the gas sensor is an infrared gas sensor, the target signal may be at least one light intensity, each resistance value carries second tag information, and the second tag information is used to indicate the wavelength of the infrared light corresponding to the light intensity. The determination module 1102 may also be used to:

It should be noted that the information interaction, execution process, etc. between the above-mentioned devices/units are based on the same concept as the method embodiment of the present application, and are devices corresponding to the above-mentioned battery pole piece alignment detection method. All implementation methods in the above-mentioned method embodiment are applicable to the embodiments of the device. Its specific functions and the technical effects brought about can be found in the method embodiment part, which will not be repeated here.

The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

FIG12 shows a schematic diagram of the hardware structure of an electronic device provided in yet another embodiment of the present application.

The electronic device may include a processor 1201 and a memory 1202 storing programs or instructions. When the processor 1201 executes the program, the steps in any of the above method embodiments are implemented.

Exemplarily, the program may be divided into one or more modules/units, one or more modules/units are stored in the memory 1202, and executed by the processor 1201 to complete the present application. One or more modules/units may be a series of program instruction segments capable of completing a specific function, and the instruction segments are used to describe the execution process of the program in the device.

Specifically, the above-mentioned processor 1201 may include a central processing unit (CPU), or an application specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiments of the present application.

The memory 1202 may include a large capacity memory for data or instructions. By way of example and not limitation, the memory 1202 may include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive, or a combination of two or more of these. Where appropriate, the memory 1202 may include a removable or non-removable (or fixed) medium. Where appropriate, the memory 1202 may be inside or outside the integrated gateway disaster recovery device. In a particular embodiment, the memory 1202 is a non-volatile solid-state memory.

The memory may include read-only memory (ROM), random access memory (RAM), magnetic disk storage media devices, optical storage media devices, flash memory devices, electrical, optical or other physical/tangible memory storage devices. Thus, typically, the memory includes one or more tangible (non-transitory) readable storage media (e.g., memory devices) encoded with software including computer-executable instructions, and when the software is executed (e.g., by one or more processors), it is operable to perform the operations described with reference to the method according to an aspect of the present disclosure.

The processor 1201 implements any one of the methods in the above embodiments by reading and executing the program or instruction stored in the memory 1202 .

In one example, the electronic device may further include a communication interface 1203 and a bus 1204. The processor 1201, the memory 1202, and the communication interface 1203 are connected via the bus 1204 and communicate with each other.

The communication interface 1203 is mainly used to implement communication between various modules, devices, units and/or equipment in the embodiments of the present application.

Bus 1204 includes hardware, software or both, and the components of online data flow billing equipment are coupled to each other. For example, but not limitation, bus may include accelerated graphics port (AGP) or other graphics bus, enhanced industrial standard architecture (EISA) bus, front-end bus (FSB), hypertransport (HT) interconnection, industrial standard architecture (ISA) bus, infinite bandwidth interconnection, low pin count (LPC) bus, memory bus, micro channel architecture (MCA) bus, peripheral component interconnection (PCI) bus, PCI-Express (PCI-X) bus, serial advanced technology attachment (SATA) bus, video electronics standard association local (VLB) bus or other suitable bus or two or more of these combinations. In appropriate cases, bus 1204 may include one or more buses. Although the present application embodiment describes and shows a specific bus, the present application considers any suitable bus or interconnection.

In addition, in combination with the method in the above embodiment, the embodiment of the present application can provide a readable storage medium for implementation. The readable storage medium stores a program or instruction; when the program or instruction is executed by a processor, any one of the methods in the above embodiment is implemented. The readable storage medium can be read by a machine such as a computer.

An embodiment of the present application further provides a chip, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the various processes of the above-mentioned method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

An embodiment of the present application provides a computer program product, which is stored in a readable storage medium. The program product is executed by at least one processor to implement the various processes of the above-mentioned method embodiment and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

It should be clear that the present application is not limited to the specific configuration and processing described above and shown in the figures. For the sake of simplicity, a detailed description of the known method is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present application is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between the steps after understanding the spirit of the present application.

The functional modules shown in the above-described block diagram can be implemented as hardware, software, firmware or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application specific integrated circuit (ASIC), appropriate firmware, a plug-in, a function card, etc. When implemented in software, the elements of the present application are programs or code segments that are used to perform the required tasks. Programs or code segments can be stored in machine-readable media, or transmitted on a transmission medium or a communication link by a data signal carried in a carrier wave. "Machine-readable media" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (RF) links, etc. Code segments can be downloaded via computer grids such as the Internet, intranets, etc.

It should also be noted that the exemplary embodiments mentioned in this application describe some methods or systems based on a series of steps or devices. However, this application is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiment, or in a different order from the embodiment, or several steps can be performed simultaneously.

Aspects of the present disclosure are described above with reference to the flowchart and/or block diagram of the method, device (system) and program product according to the embodiment of the present disclosure. It should be understood that each box in the flowchart and/or block diagram and the combination of each box in the flowchart and/or block diagram can be implemented by a computer program or instruction. These programs or instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device to produce a machine so that these instructions executed by the processor of the computer or other programmable data processing device enable the implementation of the function/action specified in one or more boxes of the flowchart and/or block diagram. Such a processor can be, but is not limited to, a general-purpose processor, a special-purpose processor, a special application processor, or a field programmable logic circuit. It can also be understood that each box in the block diagram and/or flowchart and the combination of boxes in the block diagram and/or flowchart can also be implemented by dedicated hardware that performs a specified function or action, or can be implemented by a combination of dedicated hardware and computer instructions.

Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. 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

A battery cell, comprising:

A housing having a receiving space;

An electrode assembly is disposed in the accommodation space, and when the electrode assembly is in operation, gas is generated in the accommodation space;

a gas sensor, at least partially disposed in the accommodation space, for detecting the gas;

A transmission component is connected to the gas sensor and is used to transmit the signal of the gas sensor.
The battery cell according to claim 1, wherein the gas sensor comprises at least one of a semiconductor gas sensor, an electrochemical gas sensor, and an infrared gas sensor.
The battery cell according to claim 2, wherein the semiconductor gas sensor comprises:

substrate;

A sensor electrode is disposed on the substrate;

The sensitive material layer is arranged on the substrate and connected to the sensor electrode. The sensitive material layer includes at least one sensitive material, and each of the sensitive materials is used to detect a gas.
The battery cell according to claim 3, wherein the sensitive material layer comprises a plurality of sensitive material film layers, and the plurality of sensitive material film layers are distributed in an array on the substrate.
The battery cell according to claim 2, wherein the electrochemical gas sensor comprises:

Sensing electrode and counter electrode;

A separator, disposed between the sensing electrode and the counter electrode;

The lead-out electrode is connected to the sensing electrode and the counter electrode and is used for outputting signals.
The battery cell according to claim 5, wherein the electrochemical gas sensor further comprises:

A reference electrode, wherein the separator is arranged between the reference electrode and the sensing electrode and/or the counter electrode, and the reference electrode is connected to the extraction electrode.
The battery cell according to claim 2, wherein the infrared gas sensor comprises:

An infrared light source is disposed in the accommodating cavity;

The infrared detection module is arranged in the accommodating cavity. The infrared detection module is opposite to the infrared light source and is arranged at a distance. The infrared detection module is used to detect the wavelength and light intensity of the infrared light absorbed by the gas.
The battery cell according to claim 7, wherein the infrared detection module comprises:

N filters, opposite to the infrared light source and arranged at intervals, where N is a positive integer;

The N infrared detectors correspond to the N optical filters one by one and are arranged on a side of the N optical filters away from the infrared light source.
The battery cell according to claim 7, wherein the infrared gas sensor further comprises:

an optical cavity having an inlet and an outlet for a gas;

Wherein, the infrared light source and the infrared detection module are arranged in the optical cavity.
The battery cell according to claim 9, wherein the inlet is arranged at a position of the optical cavity close to the infrared light source, and the outlet is arranged at a position of the optical cavity close to the infrared detection module.
The battery cell according to claim 1, wherein the housing comprises:

A first inner wall, wherein the first inner wall is an inner wall of the housing corresponding to a flow direction of the gas, and the gas sensor is arranged on the first inner wall.
The battery cell according to claim 11, wherein the first inner wall is an end cap assembly.
The battery cell according to claim 12, wherein the end cap assembly comprises:

End cap body;

The explosion-proof valve and the electrode terminal are arranged at intervals on the end cover body, and the gas sensor is arranged in the area between the explosion-proof valve and the electrode terminal on the end cover body.
The battery cell according to claim 12 or 13, wherein a liquid injection hole is provided on the end cover assembly, and the position of the gas sensor is staggered with the position of the liquid injection hole.
The battery cell according to claim 12, wherein the end cap assembly comprises:

End cap body;

The explosion-proof valve is arranged on the end cover body, and the gas sensor is arranged on the area of the end cover body corresponding to the explosion-proof valve.
The battery cell according to claim 12, wherein the end cap assembly comprises:

End cap body;

The lower plastic is arranged on the end cover body, the lower plastic protrudes from the first surface of the end cover body facing the electrode assembly, the lower plastic has a second surface intersecting with the first surface, and the gas sensor is arranged on the second surface.
The battery cell according to claim 1, wherein the housing comprises:

A housing body having an opening;

An end cover assembly connected to the housing body and closing the opening;

The gas sensor is arranged on the inner wall of the shell body.
The battery cell according to claim 1, further comprising:

A power supply component is connected to the gas sensor and is used to provide electrical energy to the gas sensor.
The battery cell according to claim 18, wherein the shell is provided with a first through hole, and the power supply assembly includes a power supply line, one end of the power supply line is connected to the gas sensor, and the other end passes through the first through hole for connection to an external power source independent of the battery cell.
The battery cell according to claim 18, wherein the power supply assembly includes a power supply interface, the power supply interface is arranged on the housing and connected to the gas sensor, and the power supply interface is used to connect an external power source independent of the battery cell.
The battery cell according to claim 18, wherein the electrode assembly is connected to the gas sensor, and the electrode assembly is the power supply assembly.
The battery cell according to claim 1, wherein the housing is provided with a second through hole, and the transmission component comprises a transmission line, one end of the transmission line is connected to the gas sensor, and the other end of the transmission line passes through the second through hole for connection with a signal processing device.
The battery cell according to claim 1, wherein the transmission component includes a transmission interface, the transmission interface is arranged on the housing and connected to the gas sensor, and the transmission interface is used to connect to a signal processing device.
The battery cell according to claim 1, wherein the transmission component is a wireless transmission module, and the wireless transmission module is disposed in the accommodating space.
The battery cell according to claim 24, wherein the shell includes a first inner wall, the first inner wall is an inner wall of the shell corresponding to the flow direction of the gas, and the gas sensor and the wireless transmission module are both arranged on the first inner wall.
A battery comprising a plurality of battery cells according to any one of claims 1 to 25.
An electrical device comprising the battery as claimed in claim 26, wherein the battery is used to provide electrical energy.