CN116802884A

CN116802884A - Battery monomer, battery and power consumption device

Info

Publication number: CN116802884A
Application number: CN202280011797.8A
Authority: CN
Inventors: 张继君; 朱翠翠; 王少飞; 魏奕民; 欧阳楚英
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2022-09-30
Filing date: 2022-09-30
Publication date: 2023-09-22
Also published as: WO2024065811A1

Abstract

The embodiment of the application provides a battery monomer, a battery and an electricity utilization device, wherein the battery monomer comprises a shell with an accommodating space; an electrode assembly disposed in the accommodating space, and generating gas in the accommodating space when the electrode assembly is operated; the gas sensor is at least partially arranged in the accommodating space and is used for detecting the gas; and the transmission assembly is connected with the gas sensor and is used for transmitting signals of the gas sensor.

Description

Battery monomer, battery and power consumption device

Technical Field

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

Background

In general, the gas environment inside the battery cell is an important factor affecting the safety performance of the battery cell, so it is important to detect the gas environment inside the battery cell. In the related art, the gas generated in the battery cell is often collected into a specific detection cavity through a gas guide pipe, and then the gas in the detection cavity is detected through a gas detection device, however, when the gas is led out in the current detection mode, the gas environment in the battery cell is also generally influenced, so that the detection result is deviated from the actual gas environment in the battery cell. As can be seen, in the related art, the internal gas environment of the battery cell is often difficult to be accurately detected.

Disclosure of Invention

The embodiment of the application provides a battery cell, a battery and an electricity utilization device, which are used for solving the technical problem that the internal gas environment of the battery cell is difficult to accurately detect.

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

a housing having an accommodation space;

the electrode assembly is arranged in the accommodating space, and when the electrode assembly works, gas is generated in the accommodating space;

the gas sensor is at least partially arranged in the accommodating space and is used for detecting gas;

and the transmission assembly is connected with the gas sensor and is used for transmitting signals of the gas sensor.

According to the embodiment of the application, at least part of the gas sensor is arranged in the accommodating space in the shell, so that the gas sensor can directly detect the inside of the battery cell without influencing the actual gas environment in the battery cell, and then the signal is transmitted to the signal processing device through the transmission component so as to analyze the real-time gas environment in the battery cell, and the real-time in-situ detection of the gas type and concentration in the battery cell can be realized, so that the accuracy of the detection result is improved.

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

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

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

a substrate;

a sensor electrode disposed on the substrate;

and the sensitive material layer is arranged on the substrate and connected with the sensor electrode, and comprises at least one sensitive material, wherein each sensitive material is used for detecting one gas.

According to the embodiment, different sensitive materials in the semiconductor gas sensor can respond to different types of gases and the same sensitive materials can respond to the same gases with different concentrations, so that the gas types in the battery cell and the concentration data corresponding to the gases can be detected in situ in real time according to the resistance value change output by the sensor electrode.

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

Therefore, the error value possibly caused by cross sensitivity can be analyzed through an algorithm based on the resistance value output by the sensor electrode corresponding to each sensitive material film layer and the position arrangement rule thereof, and further the concentration data corresponding to various gases can be obtained more accurately.

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

an induction electrode and a counter electrode;

the separator is arranged between the induction electrode and the counter electrode;

and the extraction electrode is connected with the induction electrode and the counter electrode and is used for outputting signals.

In this embodiment, the separator may separate the sensing electrode from the counter electrode, and different gases may undergo oxidation-reduction reactions with the sensing electrode and the counter electrode, and if the sensing electrode oxidizes the gases, the counter electrode reduces some chemicals, and if the sensing electrode reduces the gases, the counter electrode oxidizes some chemicals. Based on the above, different current value changes can be generated according to different reactions of different gases, so that the real-time in-situ detection of the gas types in the battery cell and the concentration data corresponding to the gas types can be realized according to the current value output by the extraction electrode.

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

a separator is arranged between the reference electrode and the induction electrode or the counter electrode, and the reference electrode is connected with the extraction electrode.

In this embodiment, the electrochemical reaction of the sensing electrode can be prevented from continuously proceeding by introducing the reference electrode and keeping the potential of the reference electrode and the potential of the sensing electrode fixed, and the reference electrode effectively improves the performance of the electrochemical gas sensor in the case that the electrode potential cannot be kept constant, thereby effectively improving the accuracy of the gas detection result.

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

the infrared light source is arranged in the accommodating cavity;

the infrared detection module is arranged in the accommodating cavity, opposite to the infrared light source and arranged at intervals, and is used for detecting the wavelength and the light intensity of the infrared light after being absorbed by the gas.

According to the embodiment, the real-time in-situ detection of the gas types in the battery monomer and the concentration data corresponding to the various gases can be realized through the wavelength and the light intensity of the infrared light rays which are detected by the infrared detection module in the infrared gas sensor and are absorbed by the gases.

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

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

the N infrared detectors are in one-to-one correspondence with the N optical filters and are arranged on one sides of the N optical filters, which are away from the infrared light source.

Therefore, the light intensity corresponding to different wavelengths can be detected through the combination of the N optical filters and the N infrared detectors, and then various gas types in the battery monomer and concentration data corresponding to various gases can be detected.

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

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

wherein, infrared light source and infrared detection module set up in the optical cavity.

In this embodiment, the infrared light source emits infrared light, the optical path is increased through multiple reflections of the optical cavity, gas can enter the optical cavity from the inlet, and after the infrared light with a specific wavelength emitted by the infrared light source in the optical cavity is absorbed, the gas leaves the optical cavity from the outlet, so that the optical path of the infrared light can be increased by the optical cavity, the absorption rate of the infrared light with the specific wavelength absorbed by the gas is improved, the wavelength and the light intensity of the infrared light which are detected in the optical cavity by the infrared detection module and absorbed by the gas are more accurate, and the accuracy of gas detection is improved.

Optionally, in some embodiments, the inlet is disposed in the optical cavity proximate to the near infrared light source and the outlet is disposed in the optical cavity proximate to the near infrared detection module.

Therefore, the gas can fully absorb the infrared light with the corresponding wavelength in the optical cavity, so that the result detected by the infrared detection module is more accurate, and the accuracy of detecting the gas in the battery is further improved.

Optionally, in some embodiments, the housing comprises:

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

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

Optionally, in some embodiments, the first inner wall is an end cap assembly. It will be appreciated that the surface of the end cap assembly facing the electrode assembly will typically have a convex configuration, and the sensor may be disposed in a relatively concave region when disposed in the end cap assembly, so that the installation space of the gas sensor is not required to be additionally increased, and the internal space of the battery cell is effectively saved.

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

an end cap body;

the explosion-proof valve and the electrode terminal are arranged on the end cover body at intervals, and the gas sensor is arranged in an 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 generally protruded on the surface of the end cover body facing the electrode assembly, and the gas sensor may be disposed in the area between the explosion-proof valve and the electrode terminal on the end cover body, so that the internal space of the battery cell can be effectively saved.

Optionally, in some embodiments, the end cap assembly is provided with a liquid injection hole, and the position of the gas sensor is staggered from the position of the liquid injection hole. Therefore, the influence of the gas sensor on the liquid injection process of the subsequent battery monomer can be effectively avoided.

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

an end cap body;

the explosion-proof valve is arranged on the end cover body, and the gas sensor is arranged in a region corresponding to the explosion-proof valve on the end cover body.

In this embodiment, gas sensor can set up the region of corresponding explosion-proof valve on the end cover body, can directly reform transform explosion-proof valve region, makes it can install gas sensor, need not the position of other parts of adjustment end cover subassembly for gas sensor's implantation is simpler convenient.

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

an end cap body;

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

In this embodiment, the lower plastic is protruding in the first surface of the end cover body facing the electrode assembly, and can directly set the gas sensor on the second surface intersecting with the first surface, so that the internal space of the battery cell can be effectively saved, and meanwhile, other components on the end cover assembly do not need to be correspondingly adjusted, so that the implantation of the gas sensor is simpler and more convenient.

Optionally, in some embodiments, the housing comprises:

a housing body having an opening;

an end cover assembly connected with 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 directly set up on the inner wall of shell body according to the demand, has effectively improved the flexibility of gas sensor mounted position.

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

and the power supply assembly is connected with the gas sensor and is used for supplying electric energy to the gas sensor.

Therefore, the gas sensor can work normally on the basis that the power supply assembly provides electric energy for the gas sensor, and real-time detection of the gas environment inside the battery cell is realized.

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 which is connected to the gas sensor, and the other end of which passes through the first through hole, for connection to an external power supply independent of the battery cell.

The embodiment can provide electric energy for the gas sensor through the external power supply line, so that the gas sensor can work normally, and the real-time detection of the gas environment inside the battery cell is realized.

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

According to the embodiment, the power supply interface is arranged on the shell to be connected with the external power supply to provide electric energy for the gas sensor, so that the gas sensor can work normally, and the real-time detection of the gas environment inside the battery cell is realized.

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

In this embodiment, the battery monomer can be direct for gas sensor power supply, need not external power supply, need not to carry out any trompil to the shell promptly and reform transform, can satisfy the power supply demand of gas sensor normal work, and the structure is succinct more, and the free sealing performance of battery is better.

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

The signal of the gas sensor can be transmitted to the signal processing device through the external transmission line so as to analyze the real-time gas environment inside the battery cell.

Optionally, in some embodiments, the transmission assembly includes a transmission interface disposed on the housing and connected to the gas sensor, the transmission interface being configured to connect to the signal processing device.

The signal processing device can be connected by arranging the transmission interface on the shell, so that the signal of the gas sensor can be transmitted to the signal processing device, and the real-time gas environment inside the battery cell can be analyzed conveniently.

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, can transmit gas sensor's signal through wireless transmission module, need not to carry out any trompil to the shell and reform transform, can satisfy gas sensor's signal transmission demand, the structure is succinct more, and battery monomer's sealing performance is better.

Optionally, in some embodiments, the housing includes a first inner wall, the first inner wall being an inner wall of the housing corresponding to a flow direction of the gas, the gas sensor and the wireless transmission module being disposed on the first inner wall. Therefore, the wireless transmission module is positioned on the same inner wall with the gas sensor, so that the strength of signals of the gas sensor is effectively enhanced, the integrity and accuracy of the transmitted signals of the gas sensor are ensured, and the accuracy of gas detection in the battery is further improved.

In a second aspect, embodiments of the present application also provide a battery, including a battery cell as in the first aspect.

In a third aspect, embodiments of the present application also provide an electrical device comprising a battery as in the second aspect, the battery being configured to provide electrical energy.

The foregoing description is only an overview of the present application, and is intended to be implemented in accordance with the teachings of the present application in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present application more readily apparent.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and other drawings may be obtained according to the drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a battery cell according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of another battery cell according to an embodiment of the present application;

FIG. 3 is a schematic diagram of a semiconductor gas sensor according to an embodiment of the present application;

FIG. 4 is a schematic diagram of an electrochemical gas sensor according to an embodiment of the present application;

FIG. 5a is a schematic diagram of an infrared gas sensor according to an embodiment of the present application;

FIG. 5b is a schematic diagram of a second embodiment of an infrared gas sensor;

FIG. 6a is a schematic diagram of a gas sensor according to an embodiment of the present application;

FIG. 6b is a side view of the positional relationship of the gas sensor of FIG. 6 a;

FIG. 7a is a second schematic diagram of a gas sensor according to an embodiment of the present application;

FIG. 7b is a partial side view of the positional relationship of the gas sensor of FIG. 7 a;

FIG. 8a is a third schematic diagram of a gas sensor according to an embodiment of the present application;

FIG. 8b is a partial side view of the positional relationship of the gas sensor of FIG. 8 a;

FIG. 9 is a schematic diagram of a gas detection system according to an embodiment of the present application;

fig. 10 is a flow chart illustrating a method for detecting gas in a battery cell according to an embodiment of the application;

fig. 11 is a schematic structural view of a gas detection device for a battery cell according to another embodiment of the present application;

fig. 12 is a schematic structural diagram of an electronic device according to another embodiment of the present application.

Reference numerals:

1. a housing; 11. a housing body; 12. an end cap assembly; 121. an end cap body; 1211. a first surface; 122. an explosion-proof valve; 123. an electrode terminal; 124. a liquid injection hole; 125. lower plastic; 1251. a second surface;

2. A gas sensor; 21. a semiconductor gas sensor; 211. a substrate; 212. a sensor electrode; 213. a layer of sensitive material; 22. an electrochemical gas sensor; 221. an induction electrode; 222. a counter electrode; 223. a separator; 224. an extraction electrode; 225. a reference electrode; 23. an infrared gas sensor; 231. an optical cavity; 232. an infrared light source; 233. an infrared detection module; 2331. a light filter; 2332. an infrared detector;

3. a bare cell structure; 31. an electrode assembly;

901. a battery cell; 902. a data conversion device; 903. an information processing apparatus.

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

Detailed Description

Embodiments of the present application are described in further detail below with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the application and are not intended to limit the scope of the application, i.e., the application is not limited to the embodiments described.

In the description of the present application, it is to be noted that, unless otherwise indicated, the meaning of "plurality" is two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like are merely used for convenience in describing the present application and to simplify the description, and do not denote or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The "vertical" is not strictly vertical but is within the allowable error range. "parallel" is not strictly parallel but is within the tolerance of the error.

The directional terms appearing in the following description are those directions shown in the drawings and do not limit the specific structure of the application. In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present application can be understood as appropriate by those of ordinary skill in the art.

In the present application, the battery cell may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, which is not limited in the embodiment of the present application. The battery cell may be in a cylindrical shape, a flat shape, a rectangular parallelepiped shape, or other shapes, which is not limited in this embodiment of the application. The battery cells are generally classified into three types according to the packaging method: the cylindrical battery cell, the square battery cell and the soft package battery cell are not limited in this embodiment.

Reference to a battery in accordance with an embodiment of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present application may include a battery module or a battery pack, or the like. The battery generally includes a case for enclosing one or more battery cells. The case body can prevent liquid or other foreign matters from affecting the charge or discharge of the battery cells.

The battery cell comprises an electrode assembly and electrolyte, wherein the electrode assembly consists of a positive plate, a negative plate and a separation membrane. The battery cell mainly relies on metal ions to move between the positive and negative electrode plates to operate. The positive plate comprises a positive electrode current collector and a positive electrode active material layer, wherein the positive electrode active material layer is coated on the surface of the positive electrode current collector, the current collector without the positive electrode active material layer protrudes out of the current collector coated with the positive electrode active material layer, and the current collector without the positive electrode active material layer is laminated to serve as a positive electrode lug. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate or the like. The negative electrode sheet comprises a negative electrode current collector and a negative electrode active material layer, wherein the negative electrode active material layer is coated on the surface of the negative electrode current collector, the current collector without the negative electrode active material layer protrudes out of the current collector coated with the negative electrode active material layer, and the current collector without the negative electrode active material layer is laminated to serve as a negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. The material of the diaphragm can be PP or PE. In addition, the electrode assembly may be a roll-to-roll structure or a lamination structure, and embodiments of the present application are not limited thereto.

The applicant finds that when detecting the gas environment in the battery monomer, part of gas generated in the battery monomer is often collected into a specific detection cavity through a gas guide pipe, and then the gas in the detection cavity is detected through a gas detection device, so that certain defects exist in the detection mode: when the gas is led out, the gas environment in the battery cell is also generally influenced, so that the detection result is deviated from the actual gas environment in the battery cell. Secondly, the detection process is complicated, so that the real-time performance of the detection of the gas environment in the battery monomer is poor.

Based on the above problems found by the applicant, the applicant improves the structure of the battery cell, and the technical solution described in the embodiments of the present application is applicable to the battery cell, the battery including the battery cell, and the power consumption device using the battery.

Referring to fig. 1 and fig. 2, fig. 1 and fig. 2 respectively provide two different battery cells according to an embodiment of the present application, where the battery cells may include:

a housing 1 having an accommodation space;

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

And the transmission assembly is connected with the gas sensor 2 and is used for transmitting signals of the gas sensor 2.

It will be appreciated that the battery cell generally includes a housing 1 having an accommodating space that may be used to accommodate a bare cell structure 3 composed of a positive electrode sheet, a negative electrode sheet, an electrode assembly 31, and the like. 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 with the housing body 11 and close the opening of the housing body 11.

Under the conditions of storage, charge and discharge and the like, various gases are generated in the battery monomer due to factors such as side reactions and the like, so that the types and the concentrations of the gases in the battery monomer can be changed, and the purpose of detecting the actual gas environment in the battery monomer in real time and in situ can be achieved by arranging part or all of the gas sensor 2 in the accommodating space.

Illustratively, the gas sensor 2 may be disposed on a surface of the end cap assembly 12 facing the housing body 11, as shown in fig. 1, or the gas sensor 2 may also be disposed on an inner wall of the housing body 11, as shown in fig. 2. In this way, the gas sensors 2 can each be located in the accommodation space.

The battery cell may further comprise a transmission assembly connected to the gas sensor 2, which may be used to transmit signals of the gas sensor 2 to the signal processing device, so that the signal processing device may analyze the real-time gas environment inside the battery cell. The transmission component may transmit the signal in a wired manner or may transmit the signal in a wireless manner, which is not specifically limited herein.

According to the embodiment of the application, at least part of the gas sensor 2 is arranged in the accommodating space in the shell 1, so that the gas sensor 2 can directly detect the inside of the battery cell without influencing the actual gas environment in the battery cell, and then the signal is transmitted to the signal processing device through the transmission component to analyze the real-time gas environment in the battery cell, and the real-time in-situ detection of the gas type and concentration in the battery cell can be realized, so that the accuracy of the detection result is improved.

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

In the present 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 can be understood that, in the case of the 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 each type of gas, so as to realize real-time in-situ detection of the gas type and concentration inside the battery cell.

In the case of the 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, so that the real-time in-situ detection of the gas type and concentration in the battery cell can be realized.

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

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

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

a substrate 211;

a sensor electrode 212 disposed on the substrate 211;

a layer of sensitive material 213 disposed on the substrate 211 and connected to the sensor electrode 212, the layer of sensitive material 213 comprising at least one sensitive material, each sensitive material for detecting a gas.

In the present 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 susceptor serves to support the entire structure of the semiconductor gas sensor 21 and may be made of a non-conductive organic flexible material or a non-conductive inorganic material. The sensitive material layer 213 may react with gases inside the battery cell, for example, when H2, CO, etc. gases are generated inside the battery cell, the gases may react with the sensitive material layer 213, so that the resistance value of the sensitive material layer 213 is changed.

It is understood that the layer of sensing material 213 may include at least one sensing material, one sensing material may react with one gas, and thus each sensing material may be used to detect one gas. The sensor electrodes 212 may be parts of the semiconductor gas sensor 21 for leading out a resistance signal, and may be made of a metal film, and it is understood that each sensitive material may correspond to one 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 can be obtained according to the resistance change of each sensitive material.

In one example, the sensitive material layer 213 in one semiconductor gas sensor 21 may include one sensitive material, based on which a plurality of semiconductor gas sensors 21 may be implanted inside the battery cell, and the sensitive material of each semiconductor gas sensor 21 is different, thereby enabling detection of a plurality of kinds of gases inside the battery cell. In other examples, the sensitive material layer 213 in one semiconductor gas sensor 21 may further include a plurality of sensitive materials, so that the semiconductor gas sensor 21 is implanted inside the battery cell to detect a plurality of kinds of gases inside the battery cell.

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

Optionally, in some embodiments, the sensitive material layer 213 includes multiple sensitive material film layers distributed in an array on the substrate 211.

It will be appreciated that when the sensitive material layer 213 includes a plurality of sensitive materials, there may be cross-sensitivity of the gas inside the battery cell, resulting in inaccurate detection results. Based on this, in the present 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. Therefore, the error value possibly caused by cross sensitivity can be analyzed through an algorithm based on the resistance value output by the sensor electrode 212 corresponding to each sensitive material film layer and the position arrangement rule thereof, and further the concentration data corresponding to various gases can be obtained more accurately.

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

a sensing electrode 221 and a counter electrode 222;

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

the extraction electrode 224 is connected to the sensing electrode 221 and the counter electrode 222, and outputs a signal.

In the present embodiment, as shown in fig. 4, the electrochemical gas sensor 22 may include a sensing electrode 221, a counter electrode 222, a separator 223, and an extraction electrode 224. In which the sensing electrode 221 and the counter electrode 222 are separated by a separator 223, and when gases such as CH4, CO2, etc. are generated inside the battery cell, the gases may enter the electrochemical gas sensor 22 through the micro-holes to reach the surface of the sensing electrode 221, oxidation or reduction reaction occurs on the sensing electrode 221, and the sensing electrode 221 may obtain or lose electrons, thereby generating a current value proportional to the concentration of the gases. The current value can then be supplied to the extraction electrode 224 through the sensing electrode 221 and the counter electrode 222, and the current value can be output from the extraction electrode 224, so that the concentration data of the measured gas can be determined from the current value.

It will be appreciated that the overall reaction of the electrochemical gas sensor 22 is accomplished by the sensing electrode 221 and the counter electrode 222 together, and that if the sensing electrode 221 oxidizes the gas, the counter electrode 222 reduces some of the chemicals; if the sensing electrode 221 reduces the gas, the counter electrode 222 oxidizes some of the chemicals.

In this embodiment, different oxidation or reduction reactions can be performed on the sensing electrode 221 by different gases in the electrochemical gas sensor 22, so that different current changes can be generated, and the current value is provided to the extraction electrode 224 by the counter electrode 222, so that real-time in-situ detection of the gas types in the battery cell and the concentration data corresponding to the various gases can be realized according to the current value output by the extraction electrode 224.

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

a separator 223 is provided between the reference electrode 225 and the sensing electrode 221 or the counter electrode 222, and the reference electrode 225 is connected with 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 will be appreciated that in order to prevent the electrochemical reaction of the sensing electrode 221 from proceeding continuously, the potential of the counter electrode 222 is correspondingly changed, so that the electrode potential of the sensing electrode 221 cannot be kept constant, which in turn causes performance degradation of the electrochemical gas sensor 22, affecting the accuracy of the gas detection result. In this embodiment, by introducing the reference electrode 225, the potential of the reference electrode 225 and the potential of the sensing electrode 221 are kept fixed during the operation of the electrochemical gas sensor 22, and the current change on the counter electrode 222 is measured at the same time when the gas reacts with the sensing electrode 221, and 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 the reference electrode 225, thereby effectively improving the accuracy of the gas detection result.

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

an infrared light source 232 disposed within the receiving cavity;

the infrared detection module 233 is disposed in the accommodating cavity, the infrared detection module 233 is opposite to the infrared light source 232 and disposed at intervals, and the infrared detection module 233 is used for detecting the wavelength and the light intensity of the infrared light after being absorbed by the gas.

In this embodiment, as shown in fig. 5a, the infrared gas sensor 23 may be disposed in the accommodating cavity and the infrared light source 232 and the infrared detection module 233, where the infrared detection module 233 is opposite to the infrared light source 232 and is disposed at a distance, for example, the infrared light source 232 and the infrared detection module 233 may be mounted on the inner wall of the housing 1 at a distance.

The infrared light source 232 can emit infrared light with preset light intensity and different wavelengths, the gas can absorb the infrared light with specific wavelength, and the infrared detection module 233 can detect the wavelength and the light intensity of the infrared light absorbed by the gas. It can be understood that the wavelengths of the infrared light rays absorbed by the gases of the various types are different, so that the gas types in the battery cell and the concentration data corresponding to the gases of the various types can be detected according to the light intensity changes of the infrared light rays of the different wavelengths.

For example, CO2 is detected. The CO2 absorbs the infrared light with the wavelength of 4.26um, and then the infrared light with the wavelength of 4.26um enters the infrared detector 2332 by using the optical filter 2331 with the wavelength of 4.26um in the infrared detection module 233, so as to obtain the light intensity corresponding to the infrared light with the wavelength of 4.26 um. The light intensity is related to the absorption degree of the CO2, namely, the light intensity is related to the concentration of the CO2, so that different concentrations of the CO2 entering the optical cavity 231 can be obtained through different light intensities, and the real-time detection of the CO2 is realized.

In this embodiment, the real-time in-situ detection of the gas types in the battery cell and the concentration data corresponding to the gas types can be realized by the wavelength and the light intensity of the infrared light after the infrared detection module 233 in the infrared gas sensor 23 detects the absorbed gas.

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

n filters 2331, which are arranged opposite to the infrared light source 232 at intervals, N being a positive integer;

the N infrared detectors 2332 are in one-to-one correspondence with the N optical filters 2331, and are arranged on one side of the N optical 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, where each filter 2331 may pass infrared light of a corresponding wavelength, for example, filter a may pass infrared light of wavelength a, filter B may pass infrared light of wavelength B, and filter C may pass infrared light of wavelength C.

The N infrared detectors 2332 may be in one-to-one correspondence with the N optical filters 2331, and disposed on a side of the N optical filters 2331 away from the infrared light source 232, in other words, each infrared detector 2332 may detect light intensity of the infrared light with a wavelength passing through the corresponding optical filter 2331. For example, infrared detector a may detect the intensity of infrared light at wavelength a, infrared detector B may detect the intensity of infrared light at wavelength B, and infrared detector C may detect the intensity of infrared light at wavelength C.

In this way, the combination of the N filters 2331 and the N infrared detectors 2332 can detect the light intensities corresponding to different wavelengths, so as to detect the types of gases in the battery cell and the concentration data corresponding to the types of gases.

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

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

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

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

The optical cavity 231 has an inlet through which gas can enter the optical cavity 231 and absorb infrared light of a specific wavelength within the optical cavity 231 and then exit through the outlet. The infrared light source 232 in the optical cavity 231 emits infrared light, and the optical path can be increased through multiple reflections of the optical cavity 231, so that the condition that gas is not absorbed due to the fact that the optical path of the infrared light is short is avoided, and the absorption rate of the gas for absorbing the infrared light with specific wavelength is effectively improved. The wavelength and the light intensity of the infrared light after being absorbed by the gas, which are detected in the optical cavity by the infrared detection module, are more accurate, so that the accuracy of gas detection is improved.

Optionally, in some embodiments, the inlet is disposed in the optical cavity 231 near the infrared light source 232 and the outlet is disposed in the optical cavity 231 near the near infrared detection module 233.

In this embodiment, as shown in fig. 5b, the inlet may be disposed at a position of the optical cavity 231 near the infrared light source 232, and the outlet may be disposed at a position of the optical cavity 231 near the near infrared detection module 233, so that the gas can fully absorb the infrared light with a corresponding wavelength in the optical cavity 231, so that the result detected by the infrared detection module 233 is more accurate, and the accuracy of detecting the gas in the battery is further improved.

Optionally, in some embodiments, the housing 1 comprises:

the first inner wall, which is the inner wall of the housing 1 corresponding to the flow direction of the gas, is provided on which the gas sensor 2 is disposed.

In the present embodiment, it is understood that the gas generated inside the battery generally flows upward due to the high temperature, and based on this, the uppermost inner wall of the case 1 at the time of placing the battery cells may be taken as the first inner wall. For example, if the battery cell is in a positive position, the end cap assembly 12 of the housing 1 may be the first inner wall, and if the battery cell is in a negative position, the bottom inner wall of the housing 1 opposite the end cap assembly 12 may be the first inner wall. The gas sensor 2 can be arranged on the first inner wall of the shell 1 corresponding to the flowing direction of the gas, so that the gas sensor 2 can fully contact the gas for detection, and the accuracy of the detection result is further improved.

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

As shown in fig. 6a to 8b, it will be understood that the surface of the end cap assembly 12 facing the electrode assembly 31 will generally have some protruding structures, such as the explosion-proof valve 122, the electrode terminal 123, the injection hole 124, and the lower plastic 125, protruding from the surface of the end cap assembly 12 facing the electrode assembly 31. The gas sensor 2 may be located in a relatively concave region between the convex parts, so that an installation space of the gas sensor 2 is not required to be additionally increased, and an internal space of the battery cell is effectively saved.

For example, for some larger gas sensors 2, the surface of the end cover assembly 12 may also be adaptively designed, such as by providing a groove in the surface of the end cover assembly 12 for placing the gas sensor 2. Or the end cap assembly 12 may be raised to accommodate implantation of the gas sensor 2, it will be appreciated that, as the end cap assembly 12 is raised, modification of the electrode terminals 123 of the end cap assembly 12, lengthening of the tabs of the positive and negative electrode tabs, etc., will generally be involved. Or the positive plate and the negative plate can be designed to be shortened, so that more space is provided below the end cover assembly 12 to accommodate the gas sensor 2.

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

an end cap body 121;

the explosion-proof valve 122 and the electrode terminal 123 are provided at an interval to the end cap body 121, and the gas sensor 2 is provided in a region between the explosion-proof valve 122 and the electrode terminal 123 on the end cap body 121.

In this embodiment, as shown in fig. 6a and 6b, the end cap assembly 12 may include an end cap body 121, an explosion-proof valve 122, and an electrode terminal 123. Wherein, explosion-proof valve 122 and electrode terminal 123 can the interval set up in end cover body 121, and gas sensor 2 sets up the region between explosion-proof valve 122 and electrode terminal 123 on end cover body 121 to make gas sensor 2 can be located the battery monomer inside, thereby realize the real-time normal position detection to the inside gas kind and the concentration of battery monomer, improved the accuracy of testing result.

It will be appreciated that the explosion-proof valve 122 and the electrode terminal 123 are generally protruded from the surface of the end cap body 121 facing the electrode assembly 31, and the gas sensor 2 is disposed in the region between the explosion-proof valve 122 and the electrode terminal 123 on the end cap body 121, so that the internal space of the battery cell can be effectively saved.

It is further understood that the electrode terminal 123 may include a positive electrode terminal and a negative electrode terminal, which are respectively located at both sides of the explosion-proof valve 122, and the gas sensor 2 may be disposed in a region between the explosion-proof valve 122 and the positive electrode terminal or in a region between the explosion-proof valve 122 and the negative electrode terminal, which is not particularly limited herein.

Optionally, in some embodiments, the end cap assembly 12 is provided with a fill port 124, and the gas sensor 2 is positioned offset from the fill port 124.

As shown in fig. 6a and 6b, the end cap assembly 12 is normally provided with a liquid injection hole 124, and after the battery cell end cap assembly 12 is mounted, electrolyte can be injected into the battery cell through the liquid injection hole 124. Based on this, the position of the gas sensor 2 may be staggered from the position of the liquid injection hole 124, so that the gas sensor 2 may be effectively prevented from affecting the liquid injection process of the subsequent battery cell.

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

an end cap 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 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 the end cover body 121 in a region corresponding to the explosion-proof valve 122, so that the gas sensor 2 can be located inside the battery cell, thereby realizing real-time in-situ detection of the gas type and concentration inside the battery cell, and improving the accuracy of the detection result.

Referring to fig. 7b, in general, the explosion-proof valve 122 has a protrusion on a surface of the end cap body 121 facing the electrode assembly 31, and the gas sensor 2 can be mounted on a side of the protrusion, thereby further saving the internal space of the battery cell. In addition, the gas sensor 2 is arranged in the area of the end cover body 121 corresponding to the explosion-proof valve 122, and the area of the explosion-proof valve 122 can be directly modified, so that the gas sensor 2 can be installed without adjusting the positions of other components of the end cover assembly 12, and the implantation of the gas sensor 2 is simpler and more convenient.

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

an end cap 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 the first surface 1211, and the gas sensor 2 is disposed on the second surface 1251.

In this embodiment, as shown in fig. 8a and 8b, the two ends of the end cap body 121 may be provided with lower plastic 125 for sealing when the end cap assembly 12 is mounted to the housing body 11. The lower plastic 125 generally 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 disposed on the second surface 1251 intersecting the first surface 1211 of the lower plastic 125, i.e. the gas sensor 2 is disposed on the side surface of the lower plastic 125, so that the internal space of the battery cell can be effectively saved, and meanwhile, other components on the end cap assembly 12 do not need to be correspondingly adjusted, so that the implantation of the gas sensor 2 is simpler and more convenient.

Optionally, in some embodiments, the housing 1 comprises:

a housing body 11 having an opening;

an end cap assembly 12 connected with the housing body 11 and closing the opening;

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

In the present embodiment, as shown in fig. 2, the case 1 may include a case body 11 and an end cap assembly 12, wherein the case body 11 has an open receiving space, and the end cap assembly 12 may be connected with the case body 11 and close the opening of the case 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 near the end cover assembly 12, so that the gas sensor 2 may be located inside the battery cell, thereby implementing real-time in-situ detection of the gas type and concentration inside the battery cell, and improving accuracy of the detection result. Like this, gas sensor can directly set up on the inner wall of shell body according to the demand, has effectively improved gas sensor mounted position's flexibility.

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

and the power supply assembly is connected with the gas sensor 2 and is used for supplying electric energy to the gas sensor 2.

In this embodiment, the battery cell may further include a power supply assembly connected to the gas sensor 2, where the power supply assembly may provide electrical energy for the gas sensor 2, so that the gas sensor 2 may work normally, and real-time detection of the gas environment inside the battery cell is achieved.

It is understood that the power supply assembly may be disposed inside the battery cell or may be disposed outside the battery cell, which is not particularly limited herein.

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 which is connected to the gas sensor 2, and the other end of which passes through the first through hole, for connection to an external power supply 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 supply independent of the battery cell. In other words, a power supply line needs to be led out from the inside of the battery cell to connect to an external power supply that supplies electric power to the gas sensor 2. Based on this, a first through hole may be provided in the housing 1, and for example, a first through hole may be provided in the end cap assembly 12 so that the power supply line may pass through the first through hole. The external power source may be other batteries, a mobile power source, or an electrified socket, and is not particularly limited herein.

The embodiment can provide electric energy for the gas sensor 2 through the external power supply line, so that the gas sensor 2 can work normally, and the real-time detection of the gas environment inside the battery cell is realized.

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

In this embodiment, the power supply assembly may include a power supply interface that may be provided on the housing 1, and illustratively, on the end cap assembly 12. The power supply interface can be internally connected with the gas sensor 2 and can be used for being connected with an external power supply independent of the battery cell so that the external power supply can provide electric energy for the gas sensor 2. The external power source may be other batteries, a mobile power source, or an electrified socket, and is not particularly limited herein.

In this embodiment, the external power supply can be connected to provide electric energy for the gas sensor 2 by setting the power supply interface on the housing 1, so that the gas sensor 2 can work normally, and real-time detection of the gas environment inside the battery cell is realized.

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

In this embodiment, as shown in fig. 1 and 2, the battery cell may further include an electrode assembly 31 disposed in the receiving space, and the gas sensor 2 may be directly connected to the electrode assembly 31 such that the electrode assembly 31 supplies power to the gas sensor 2. In other words, the battery monomer can directly supply power for the gas sensor 2, an external power supply is not needed, namely, the casing 1 is not required to be subjected to any perforation transformation, the power supply requirement of normal operation of the gas sensor 2 can be met, the structure is simpler, and the sealing performance of the battery monomer is better.

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

In this embodiment, the transmission assembly may include a transmission line (e.g., an optical fiber), one end of which is connected to the gas sensor 2, and the other end of which may be connected to the signal processing device. In other words, a transmission line needs to be led out from the inside of the battery cell to connect the signal processing device. Based on this, a second through hole may be provided in the housing 1, and for example, a second through hole may be provided in the end cap assembly 12 so that the transmission line may pass through the second through hole.

It will be appreciated that in the case where the battery cell includes both a power supply line and a transmission line, the first through hole and the second through hole may be through holes formed at different positions of the end cap assembly 12, respectively, or the first through hole and the second through hole may be the same through hole, in other words, only one through hole is formed in the end cap assembly 12, and both the power supply line and the transmission line pass through the through holes.

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

Optionally, in some embodiments, the transmission assembly comprises a transmission interface, which is provided on the housing 1 and is connected to the gas sensor 2, the transmission interface being used for connecting the signal processing device.

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

In this embodiment, the signal processing device may be connected by providing a transmission interface on the housing 1, so that the signal of the gas sensor 2 may be transmitted to the signal processing device, so as to facilitate analysis of the real-time gas environment inside the battery cell.

In this embodiment, the transmission component may be a wireless transmission module, that is, the signal of the gas sensor 2 may be transmitted to the signal processing device by wireless transmission. The wireless transmission module may be disposed in the accommodating space, wherein the wireless transmission module may include a wireless communication technology (WiFi) or a bluetooth technology, and the like, which is not limited herein.

In this embodiment, the signal of the gas sensor 2 can be transmitted through the wireless transmission module, any perforation modification is not required to be performed on the shell 1, the signal transmission requirement of the gas sensor 2 can be met, 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 a flow direction of the gas, on which the gas sensor 2 and the wireless transmission module are both disposed.

For example, if the battery cell is being placed, the first inner wall may be the end cap assembly 12, i.e., both the gas sensor 2 and the wireless transmission module may be disposed on the end cap assembly 12. Like this, wireless transmission module is through being in on same inner wall with gas sensor 2, has effectively strengthened the intensity of gas sensor 2's signal to guarantee the integrality and the accuracy of the signal of gas sensor 2 of transmission, further improved the inside gas detection's of battery degree of accuracy.

The embodiment of the application also provides a battery, which can comprise any battery monomer. It is understood that reference to a battery in accordance with an embodiment of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present application may include a battery module or a battery pack, or the like. The battery generally includes a case for enclosing one or more battery cells. The case body can prevent liquid or other foreign matters from affecting the charge or discharge of the battery cells.

In the battery, the number of the battery cells may be one or more. If the number of the battery cells is multiple, the battery cells can be connected in series, in parallel or in series-parallel. The series-parallel connection refers to that a plurality of battery monomers are connected in series or in parallel. The battery units can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the battery units is accommodated in the box body, or the battery modules are formed by the battery units which are connected in series or in parallel or in series-parallel. The battery modules are connected in series, in parallel or in series-parallel to form a whole and are accommodated in the box body.

The embodiment of the application also provides an electric device which can comprise the battery, and the battery can be used for providing electric energy. The electric device can be a vehicle, a mobile phone, portable equipment, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool and the like. The vehicle can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle; spacecraft including airplanes, rockets, space planes, spacecraft, and the like; the electric toy includes fixed or mobile electric toys, such as a game machine, an electric car toy, an electric ship toy, and an electric airplane toy; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete shakers, and electric planers, among others. The embodiment of the application does not limit the electric equipment in particular.

As shown in fig. 9, an embodiment of the present application further provides a gas detection system, which may include:

the battery cell 901 comprises a shell and a gas sensor, wherein the shell is provided with an accommodating space, and the gas sensor is arranged in the accommodating space;

the data conversion device 902 is connected with the gas sensor, and is used for receiving a target signal of the gas sensor and converting the target signal into corresponding gas data;

the signal processing device 903 is connected to the data conversion device 902, and is configured 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, under the conditions of storage, charge and discharge, etc., the battery cell 901 generates various gases due to side reactions and other factors inside the battery cell 901, so that the gas types and concentrations inside the battery cell 901 may change. Based on this, a target signal inside the battery cell 901 may be acquired by a gas sensor. For example, the resistance value corresponding to the resistance change can be collected by the semiconductor gas sensor, the current value corresponding to the current change can be collected by the electrochemical gas sensor, and the light intensity corresponding to the light intensity change of the infrared light with different wavelengths can be collected by the infrared gas sensor.

After the target signal is collected, the target signal may be transmitted to the data conversion device 902, where the data conversion device 902 may pre-store a relationship curve between a preset signal of the gas sensor and gas data, where the gas data may include gas type and/or gas concentration data. The target signal can be automatically matched in the data conversion device, so that the target signal can be directly converted into 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 under the condition that the gas environment does not reach the standard, relevant early warning can be timely made, and the electrical performance and the safety performance of the battery cell are effectively ensured.

As shown in fig. 10, an embodiment of the present application may further provide a gas detection method of a battery cell including a case having an accommodating space, and a gas sensor disposed in the accommodating space, the gas detection method may include the steps of:

in step 1001, a target signal acquired by a gas sensor is acquired.

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

Step 1002, determining target gas data matched with the target signals according to a preset relation curve, wherein the relation curve comprises gas sensor signals and gas data in one-to-one correspondence, and the gas data comprises gas type and/or gas concentration data.

In step 1002, a relationship curve between a preset signal of a gas sensor and gas data may be stored in advance, after a target signal is obtained, matching may be performed according to the relationship curve, and target gas data corresponding to the target signal is determined, where the target gas data may indicate a gas type, a gas concentration, or a gas of a certain type and a gas concentration corresponding to the gas of the type.

In step 1003, a gas environment detection result inside the battery cell is determined according to the target gas data.

In step 1003, the gas environment inside the battery cell may be monitored in real time according to the target gas data, and whether the gas environment meets the standard is determined. And under the condition that the gas environment does not reach the standard, relevant early warning can be timely made, and the electrical property and the safety performance of the battery monomer are effectively ensured.

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

According to a preset relation curve, determining target gas data matched with the target signal can comprise the following steps:

determining the gas type corresponding to the detected gas according to the first tag information;

and determining the gas concentration corresponding to the measured gas according to the resistance value.

In this embodiment, according to the characteristic of each sensitive material of the semiconductor gas sensor for detecting a gas, the relationship curve may include a correspondence relationship between the sensitive material and a gas type, and a correspondence relationship between a resistance value and a gas concentration under the gas type. The gas type corresponding to the detected gas can be determined according to the first tag information carried by the target signal, and the gas concentration corresponding to the detected gas can be determined according to the resistance value. For example, the greater the resistance value, the more violent the reaction of the measured gas with the surface of the sensitive material, the higher the gas concentration of the measured gas can be explained.

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

and determining the gas type and the gas concentration corresponding to the detected gas according to the current value.

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

In some embodiments, in the case that 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, where the second tag information is used to indicate a wavelength of an infrared light corresponding to the light intensity;

determining the gas type corresponding to the detected gas according to the second tag information;

and determining the gas concentration corresponding to the detected gas 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 with different wavelengths, the relationship curve may include the correspondence between the wavelength of the infrared light and the type of the gas, and the correspondence between the light intensity and the concentration of the gas under the type of the gas. The gas type corresponding to the detected gas can be determined according to the second tag information carried by the target signal, and the gas concentration corresponding to the detected gas can be determined according to the light intensity. For example, the smaller the light intensity, the more infrared light is absorbed by the measured gas, and the higher the gas concentration of the measured gas can be explained.

Based on the method for detecting the gas of the battery cell provided by the embodiment, the application also provides an embodiment of a device for detecting the gas of the battery cell.

Fig. 11 is a schematic structural view of a gas detection device for a battery cell according to another embodiment of the present application, and only a portion related to the embodiment of the present application is shown for convenience of explanation.

As shown in fig. 11, in the gas detection device 1100 of a battery cell according to the embodiment of the present application, the battery cell may include a housing having an accommodating space, and a gas sensor disposed in the accommodating space, and the gas detection device 1100 may include:

an acquisition module 1101, configured to acquire a target signal acquired by a gas sensor;

a determining module 1102, configured to determine target gas data matched with the target signal according to a preset relationship curve, where the relationship curve includes preset signals and gas data of the gas sensors in a one-to-one correspondence, and the gas data includes gas type and/or gas concentration data;

the detection module 1103 is configured to determine a detection result of the gas environment inside the battery cell according to the target gas data.

In some embodiments, in the case where the gas sensor is a semiconductor gas sensor, the target signal may be at least one resistance value, each resistance value carrying first tag information, where the first tag information is used to indicate a sensitive material corresponding to the resistance value, and the determining module 1102 may further be configured to:

In some embodiments, where the gas sensor is an electrochemical gas sensor, the target signal may be a current value and the determination module 1102 may be further configured to:

In some embodiments, in the case where 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, where the second tag information is used to indicate a wavelength of an infrared light corresponding to the light intensity, and the determining module 1102 may further be configured to:

It should be noted that, based on the same concept as the method embodiment of the present application, the information interaction and the execution process between the above devices/units are devices corresponding to the method for detecting the alignment degree of the battery pole piece, and all implementation manners in the above method embodiment are applicable to the embodiment of the device, and specific functions and technical effects thereof may be found in the method embodiment section, which is not repeated herein.

It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, the specific names of the functional units and modules are only for distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.

Fig. 12 is a schematic diagram of a hardware structure of an electronic device according to another embodiment of the present application.

The electronic device may include a processor 1201 and a memory 1202 in which programs or instructions are stored. The steps of any of the various method embodiments described above are implemented when the processor 1201 executes a program.

By way of example, a program may be partitioned into one or more modules/units that are stored in memory 1202 and executed by processor 1201 to perform the present application. One or more of the modules/units may be a series of program instruction segments capable of performing specific functions to describe the execution of the program in the device.

In particular, the processor 1201 may include a Central Processing Unit (CPU), or an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), or may be configured as one or more integrated circuits that implement embodiments of the present application.

Memory 1202 may include mass storage for data or instructions. By way of example, and not limitation, memory 1202 may include a Hard Disk Drive (HDD), floppy Disk Drive, flash memory, optical Disk, magneto-optical Disk, magnetic tape, or universal serial bus (Universal Serial Bus, USB) Drive, or a combination of two or more of the above. Memory 1202 may include removable or non-removable (or fixed) media where appropriate. Memory 1202 may be internal or external to the integrated gateway disaster recovery device, where appropriate. 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, in general, the memory includes one or more tangible (non-transitory) readable storage media (e.g., memory devices) encoded with software comprising 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 methods in accordance with aspects of the present disclosure.

The processor 1201 implements any of the methods of the embodiments described above by reading and executing programs or instructions stored in the memory 1202.

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

The communication interface 1203 is mainly used for implementing communication among the modules, devices, units and/or apparatuses in the embodiment of the present application.

Bus 1204 includes hardware, software, or both, coupling the components of the online data flow billing device to each other. By way of example, and not limitation, the buses may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a HyperTransport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an infiniband interconnect, a Low Pin Count (LPC) bus, a memory bus, a micro channel architecture (MCa) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a video electronics standards association local (VLB) bus, or other suitable bus, or a combination of two or more of the above. Bus 1204 may include one or more buses, where appropriate. Although embodiments of the application have been described and illustrated with respect to a particular bus, the application contemplates any suitable bus or interconnect.

In addition, in conjunction with the method in the above embodiments, embodiments of the present application may be implemented by providing a readable storage medium. The readable storage medium has a program or instructions stored thereon; the program or instructions, when executed by a processor, implement any of the methods of the embodiments described above. The readable storage medium may be read by a machine such as a computer.

The embodiment of the application further provides a chip, which comprises a processor and a communication interface, wherein the communication interface is coupled with the processor, and the processor is used for running programs or instructions to realize the processes of the embodiment of the method, and can achieve the same technical effects, so that repetition is avoided, and the description is omitted here.

It should be understood that the chips referred to in the embodiments of the present application may also be referred to as system-on-chip chips, chip systems, or system-on-chip chips, etc.

Embodiments of the present application provide a computer program product stored in a readable storage medium, where the program product is executed by at least one processor to implement the respective processes of the above method embodiments, and achieve the same technical effects, and for avoiding repetition, a detailed description is omitted herein.

It should be understood that the application is not limited to the particular arrangements and instrumentality described above and shown in the drawings. For the sake of brevity, a detailed description of known methods is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method processes of the present application are 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 steps, after appreciating the spirit of the present application.

The functional blocks shown in the above-described structural block diagrams may be implemented in hardware, software, firmware, or a combination thereof. When implemented in hardware, it may be, for example, an electronic circuit, an Application Specific Integrated Circuit (ASIC), suitable firmware, a plug-in, a function card, or the like. When implemented in software, the elements of the application are the programs or code segments used to perform the required tasks. The program or code segments may be stored in a machine readable medium or transmitted over transmission media or communication links by a data signal carried in a carrier wave. A "machine-readable medium" may include any medium that can store or transfer information. Examples of machine-readable media include electronic circuitry, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio Frequency (RF) links, and the like. The code segments may be downloaded via computer grids such as the internet, intranets, etc.

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

Aspects of the present disclosure are described above with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and program products according to embodiments of the disclosure. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer programs or instructions. These programs or instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, enable the implementation of the functions/acts specified in the flowchart and/or block diagram block or blocks. Such a processor may be, but is not limited to being, a general purpose processor, a special purpose processor, an application specific processor, or a field programmable logic circuit. It will also be understood that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware which performs the specified functions or acts, or combinations of special purpose hardware and computer instructions.

While the application has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the application. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims

1. A battery cell comprising:

a housing having an accommodation space;

an electrode assembly disposed in the accommodating space, and generating gas in the accommodating space when the electrode assembly is operated;

the gas sensor is at least partially arranged in the accommodating space and is used for detecting the gas;

2. The battery cell of claim 1, wherein the gas sensor comprises at least one of a semiconductor gas sensor, an electrochemical gas sensor, and an infrared gas sensor.

3. The battery cell of claim 2, wherein the semiconductor gas sensor comprises:

a substrate;

a sensor electrode disposed on the substrate;

the sensitive material layers are arranged on the substrate and connected with the sensor electrodes, and each sensitive material layer comprises at least one sensitive material used for detecting one gas.

4. The battery cell of claim 3, wherein the layer of sensitive material comprises a plurality of layers of sensitive material distributed in an array on the substrate.

5. The battery cell of claim 2, wherein the electrochemical gas sensor comprises:

an induction electrode and a counter electrode;

a separator disposed between the sensing electrode and the counter electrode;

6. The battery cell of claim 5, wherein the electrochemical gas sensor further comprises:

the separator is arranged between the reference electrode and the induction electrode and/or the counter electrode, and the reference electrode is connected with the extraction electrode.

7. The battery cell of claim 2, wherein the infrared gas sensor comprises:

the infrared light source is arranged in the accommodating cavity;

the infrared detection module is arranged in the accommodating cavity, is opposite to the infrared light source and is arranged at intervals, and the infrared detection module is used for detecting the wavelength and the light intensity of the infrared light after being absorbed by the gas.

8. The battery cell of claim 7, wherein the infrared detection module comprises:

And the N infrared detectors are in one-to-one correspondence with the N optical filters and are arranged on one side, away from the infrared light source, of the N optical filters.

9. The battery cell of claim 7, wherein the infrared gas sensor further comprises:

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

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

10. The battery cell of claim 9, wherein the inlet is disposed in the optical cavity proximate to the infrared light source and the outlet is disposed in the optical cavity proximate to the infrared detection module.

11. The battery cell of claim 1, wherein the housing comprises:

the gas sensor comprises a first inner wall, wherein the first inner wall is an inner wall of the shell corresponding to the flowing direction of the gas, and the gas sensor is arranged on the first inner wall.

12. The battery cell of claim 11, wherein the first inner wall is an end cap assembly.

13. The battery cell of claim 12, wherein the end cap assembly comprises:

an 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 on the end cover body in an area between the explosion-proof valve and the electrode terminal.

14. The battery cell according to claim 12 or 13, wherein the end cover assembly is provided with a liquid injection hole, and the position of the gas sensor is staggered from the position of the liquid injection hole.

15. The battery cell of claim 12, wherein the end cap assembly comprises:

an end cap body;

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

16. The battery cell of claim 12, wherein the end cap assembly comprises:

an end cap body;

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

17. The battery cell of claim 1, wherein the housing comprises:

a housing body having an opening;

an end cap assembly connected to the housing body and closing the opening;

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

18. The battery cell of claim 1, further comprising:

And the power supply assembly is connected with the gas sensor and is used for providing electric energy for the gas sensor.

19. The battery cell of claim 18, wherein the housing defines a first through hole, and the power supply assembly includes a power supply line having one end connected to the gas sensor and the other end passing through the first through hole for connection to an external power source independent of the battery cell.

20. The battery cell of claim 18, wherein the power assembly comprises a power interface disposed on the housing and connected to the gas sensor, the power interface for connecting an external power source independent of the battery cell.

21. The battery cell of claim 18, wherein the electrode assembly is connected to the gas sensor, the electrode assembly being the power supply assembly.

22. The battery cell according to claim 1, wherein the housing is provided with a second through hole, and the transmission assembly includes a transmission line having one end connected to the gas sensor and the other end passing through the second through hole for connection with a signal processing device.

23. The battery cell of claim 1, wherein the transmission assembly comprises a transmission interface disposed on the housing and connected to the gas sensor, the transmission interface for connecting a signal processing device.

24. The battery cell of claim 1, wherein the transmission assembly is a wireless transmission module disposed within the receiving space.

25. The battery cell of claim 24, wherein the housing comprises a first inner wall, the first inner wall being an inner wall of the housing corresponding to a flow direction of the gas, the gas sensor and the wireless transmission module each being disposed on the first inner wall.

26. A battery comprising a plurality of cells according to any one of claims 1 to 25.

27. An electrical device comprising the battery of claim 26 for providing electrical energy.