Battery monomer, battery and electric device

Abstract

The utility model discloses a battery monomer, a battery and a power utilization device. The battery monomer comprises a shell and a detection module, the shell comprises a wall part, and the wall part comprises a light-transmitting part; the detection module is arranged in the shell, the detection module comprises a detection element and a first optical communication element, the detection element is connected with the first optical communication element, the detection element is used for detecting state data of the single batteries, and the first optical communication element is used for transmitting signal light generated according to the state data to the outside of the shell through the light transmitting part. Therefore, the state data of the battery is transmitted to the outer side of the battery monomer in a wireless transmission mode, compared with a wired transmission mode, the complexity of a wire harness in the battery monomer can be further reduced, a through hole for the wire harness to penetrate through does not need to be additionally formed in the shell, and the overall processing difficulty is reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell, a battery and an electrical device. Background Art

[0002] Energy conservation and emission reduction are the key to sustainable development, which has promoted the adjustment of energy structure and the development and application of battery technology. The key to the development of battery technology lies in electrochemical energy storage technology, which has been widely used in portable electronics, electric vehicles and energy storage systems due to its high energy density, good cycle capacity, high operating voltage, environmental protection and low self-discharge.

[0003] A battery generally includes one or more battery cells. During use, the working status of the battery cell can be monitored by a built-in detection module, and the generated working status is then transmitted to the outside of the battery cell by wired transmission. However, the wired transmission method will make the overall wiring harness cumbersome, and it is necessary to further process the structure of the adaptable wiring harness on the battery cell, making the overall processing more difficult. Utility Model Content

[0004] The main purpose of the present application is to provide a battery cell, a battery and an electrical device, aiming to solve the above-mentioned technical problems existing in the prior art.

[0005] In order to solve the above problems, the present application provides a battery cell, which includes: a shell and a detection module, the shell includes a wall portion, and the wall portion includes a light-transmitting component; the detection module is arranged inside the shell, and the detection module includes a detection element and a first optical communication element, the detection element is connected to the first optical communication element, the detection element is used to detect the status data of the battery cell, and the first optical communication element is used to transmit the signal light generated according to the status data to the outside of the shell through the light-transmitting component. Thus, the status data of the battery cell is detected by the built-in detection element, and the first optical communication element transmits the signal light generated according to the status data to the outside of the shell through the light-transmitting component, so as to transmit the battery status data to the outside of the battery cell by wireless transmission. Compared with the wired transmission method, it can further reduce the complexity of the wiring harness in the battery cell, and there is no need to open an additional through hole on the shell for passing the wiring harness, thereby reducing the overall processing difficulty.

[0006] In some embodiments, the light-transmitting component penetrates the opposite surfaces of the wall portion in the thickness direction of the wall portion. Thus, the light-transmitting component penetrates the opposite surfaces of the wall portion in the thickness direction of the wall portion, which can facilitate the transmission of signal light from the inside of the battery cell to the outside of the battery cell through the light-transmitting component, thereby improving the transmission efficiency of the signal light.

[0007] In some embodiments, the wall portion is provided with a mounting hole penetrating the wall portion in the thickness direction, and the light-transmitting component includes a first light-transmitting portion and a second light-transmitting portion connected to each other, the first light-transmitting portion is embedded in the mounting hole, and the second light-transmitting portion is connected to the side of the wall portion facing the outside of the shell, or the second light-transmitting portion is connected to the side of the wall portion facing the inside of the shell. Thus, the second light-transmitting portion is connected to the side of the wall portion facing the outside of the shell or the side facing the inside of the shell, so that the second light-transmitting portion is relatively fixed to the shell, and the first light-transmitting portion is embedded in the mounting hole, and the first light-transmitting portion can be installed and limited through the mounting hole, thereby improving the stability of the connection of the light-transmitting component.

[0008] In some embodiments, the light-transmitting component further includes a third light-transmitting portion, the second light-transmitting portion and the third light-transmitting portion are respectively connected to two ends of the first light-transmitting portion in the thickness direction, one of the second light-transmitting portion and the third light-transmitting portion is connected to the side of the wall portion facing the outside of the shell, and the other is connected to the side of the wall portion facing the inside of the shell. Thus, by respectively connecting the third light-transmitting portion and the second light-transmitting portion to the opposite side surfaces of the wall portion, the stability of the connection between the light-transmitting component and the wall portion can be further improved.

[0009] In some embodiments, the wall portion is provided with a mounting hole penetrating the wall portion along the thickness direction of the wall portion, and the light-transmitting component further comprises a light-transmitting body and a sealing member, wherein the sealing member is arranged around the circumference of the light-transmitting body, and the light-transmitting body is embedded in the mounting hole through the sealing member. Thus, the sealing member is arranged around the circumference of the light-transmitting body, so that the light-transmitting body can be embedded in the mounting hole through the sealing member, thereby improving the stability of the installation of the light-transmitting body and the sealing effect of the mounting hole, and reducing the risk of leakage of electrolyte etc. inside the battery cell from the mounting hole.

[0010] In some embodiments, the sealing member includes a sealing main body and a sealing connection part, the sealing main body is provided with a mounting groove, the notch of the mounting groove faces the outside of the housing, the light-transmitting main body is arranged in the mounting groove, and the sealing connection part is connected to the side of the wall facing the outside of the housing. Thus, the notch of the mounting groove faces the outside of the housing, the light-transmitting main body is arranged in the mounting groove, the light-transmitting main body can be easily installed and fixed by the sealing main body, and the sealing connection part is connected to the side of the wall facing the outside of the housing, and the fixing method of the light-transmitting component can be simplified by the sealing member, thereby improving the installation efficiency, etc.

[0011] In some embodiments, the bottom wall of the mounting groove is provided with a light-transmitting hole, the light-transmitting hole communicates with the inside of the housing and the mounting groove, the light-transmitting body covers the light-transmitting hole, and the signal light is transmitted to the outside of the housing through the light-transmitting hole and the light-transmitting body. Thus, by providing a light-transmitting hole in the bottom wall of the mounting groove and the light-transmitting body covering the light-transmitting hole, it is possible to facilitate the transmission of the signal light from the inside of the battery cell to the outside of the battery cell through the light-transmitting component, thereby improving the stability of the transmission of the signal light.

[0012] In some embodiments, the mounting hole is a liquid injection hole. Thus, by using the liquid injection hole as the mounting hole, it is unnecessary to open an additional mounting hole on the wall to accommodate the light-transmitting component, thereby simplifying the overall structure.

[0013] In some embodiments, the battery cell further includes an electrode column and a first conductive member, the electrode column is disposed through the wall, the first conductive member is located inside the housing, and is respectively connected to the electrode column and the detection module, so that the electrode column and the detection module form a current loop. Thus, a current loop is formed between the detection module and the electrode column through the first conductive member, which can facilitate powering the detection module through the electrode column, thereby reducing the difficulty of powering the detection module.

[0014] In some embodiments, the electrode column further includes a positive electrode column and a negative electrode column, the positive electrode column and the negative electrode column are respectively penetrated through the wall, the detection module is arranged between the positive electrode column and the negative electrode column, and the first conductive member includes two first wires, one first wire connects the positive electrode column and the detection module, and the other first wire connects the negative electrode column and the detection module. Thus, the detection module is arranged between the positive electrode column and the negative electrode column, which can simultaneously reduce the length of the harness of the two first wires, simplify the complexity of the harness layout, and reduce the difficulty of power supply of the detection module.

[0015] In some embodiments, the battery cell further comprises a lower plastic part, which is fitted on the side of the wall facing the inside of the shell, and the lower plastic part is provided with a receiving groove, the notch of which faces the wall, and the detection module is provided in the receiving groove. Thus, by fitting the lower plastic part on the side of the wall facing the inside of the shell, the inside of the shell and the wall can be electrically insulated by the lower plastic part, and by providing the receiving groove on the lower plastic part so as to place the detection module in the receiving groove, the complexity of installing and fixing the detection module can be simplified.

[0016] In some embodiments, the battery cell also includes a data processing module, which is disposed outside the housing. The data processing module includes a second optical communication element and a data processing element that are connected to each other, the second optical communication element is used to receive signal light, and the data processing element is used to receive data generated according to the signal light. Thus, the data processing module is disposed outside the housing, which facilitates the second optical communication element to receive signal light outside the housing, and to obtain the status data of the battery cell through the data processing element, thereby realizing the sending and receiving of battery cell data through optical signal transmission. Compared with the wired transmission method, it can further reduce the complexity of the wiring harness in the battery cell, and there is no need to open additional through holes on the housing for passing the wiring harness, thereby reducing the overall processing difficulty.

[0017] In some embodiments, the first optical communication element, the light-transmitting component, and the second optical communication element are sequentially arranged in the thickness direction of the wall portion. Thus, the first optical communication element, the light-transmitting component, and the second optical communication element are sequentially arranged in the thickness direction of the wall portion, which can reduce the transmission path of the signal light, improve the reception efficiency of the signal light, and thus improve the overall data transmission efficiency.

[0018] In some embodiments, the battery cell further includes an electrode column and a second conductive member, the electrode column is disposed through the wall, the second conductive member is located outside the housing, and is respectively connected to the electrode column and the data processing module, so that the electrode column and the data processing module form a current loop. Thus, a current loop is formed between the data processing module and the electrode column through the second conductive member, which can facilitate powering the data processing module through the electrode column, thereby reducing the difficulty of powering the data processing module.

[0019] In some embodiments, the electrode column further includes a positive electrode column and a negative electrode column, the positive electrode column and the negative electrode column are respectively penetrated through the wall, the data processing module is arranged between the positive electrode column and the negative electrode column, and the second conductive member includes two second wires, one second wire connects the positive electrode column and the data processing module, and the other second wire connects the negative electrode column and the data processing module. Thus, the data processing module is arranged between the positive electrode column and the negative electrode column, which can simultaneously reduce the length of the harness of the two second wires, simplify the complexity of the harness layout, and reduce the difficulty of power supply of the data processing module.

[0020] In some embodiments, the data processing module further includes a wireless communication element, which is connected to the data processing element and is used to transmit the data generated by the signal light to an external device. Thus, the data generated by the signal light can be transmitted to the external device through the wireless communication element, which can reduce the complexity of the wiring harness compared to the wired transmission method, making the entire communication method more concise.

[0021] In some embodiments, the detection element includes one or more of a temperature sensor, an air pressure sensor, a voltage sensor, and an impedance sensor. Thus, the detection element includes one or more of a temperature sensor, an air pressure sensor, a voltage sensor, and an impedance sensor, which is conducive to targeted detection of the working state of the battery cell and facilitates targeted management of the battery cell.

[0022] In order to solve the above problems, the present application provides a battery, which includes the above battery cell.

[0023] In order to solve the above problems, the present application provides an electrical device, which includes the battery as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 is a schematic structural diagram of a vehicle according to one or more embodiments of the present application;

[0026] Figure 2 is a schematic diagram of an exploded structure of a battery according to one or more embodiments of the present application;

[0027] Figure 3 is a schematic diagram of an exploded structure of a battery cell according to one or more embodiments of the present application;

[0028] Figure 4 yes Figure 3 A schematic diagram of the top view of the battery cell shown;

[0029] Figure 5 yes Figure 4 The first cross-sectional structure schematic diagram of the battery cell shown along the AA direction;

[0030] Figure 6 yes Figure 4 The second cross-sectional structure schematic diagram of the battery cell shown along the AA direction;

[0031] Figure 7 yes Figure 4 The third cross-sectional structure schematic diagram of the battery cell along the AA direction is shown;

[0032] Figure 8 yes Figure 4 The fourth cross-sectional structure schematic diagram of the battery cell along the AA direction shown;

[0033] Fig. 9 yes Figure 4 The fifth cross-sectional structure schematic diagram of the battery cell along the AA direction is shown.

[0034] Reference numerals: vehicle 1; battery 2; controller 3; motor 4; housing 20; first part 21; second part 22; battery cell 10; housing 100; wall 110; mounting hole 111; housing 120; electrode assembly 130; electrode column 140; positive column 141; negative column 142; detection module 200; first optical communication element 210; signal light 211; detection element 220; light-transmitting component 300; first light-transmitting portion 310; first Second light-transmitting portion 320; third light-transmitting portion 330; light-transmitting body 340; sealing member 400; sealing body portion 410; light-transmitting hole 411; sealing connection portion 420; mounting groove 430; data processing module 500; second optical communication element 510; data processing element 520; wireless communication element 530; first conductive member 600; first conductor 610; second conductive member 700; second conductor 710; lower plastic member 800; accommodating groove 810. DETAILED DESCRIPTION

[0035] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0037] At present, from the perspective of market development, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of battery application areas, its market demand is also constantly expanding.

[0038] Batteries mentioned in this field can be divided into disposable batteries and rechargeable batteries according to whether they are rechargeable. Disposable batteries (Primary Battery) are also called "disposable" batteries and original batteries, because after they are exhausted, they can no longer be recharged and can only be discarded. Rechargeable batteries are also called secondary batteries (Secondary Battery) or secondary batteries, storage batteries. The manufacturing materials and processes of rechargeable batteries are different from those of primary batteries. Its advantage is that it can be recycled many times after charging, and the output current load capacity of rechargeable batteries is higher than that of most disposable batteries. The common types of rechargeable batteries at present are: lead-acid batteries, nickel-metal hydride batteries and lithium-ion batteries. Lithium-ion batteries have the advantages of light weight, large capacity (the capacity is 1.5 to 2 times that of nickel-metal hydride batteries of the same weight), no memory effect, and have a very low self-discharge rate. Therefore, even though the price is relatively high, they are still widely used. Lithium-ion batteries are currently also widely used in pure electric vehicles and hybrid vehicles. The capacity of lithium-ion batteries used for this purpose is relatively low, but they have a larger output and charging current, and also have a longer service life, but the cost is higher.

[0039] The battery described in the embodiments of the present application refers to a rechargeable battery or a disposable battery. The embodiments disclosed in the present application will be described below mainly by taking a lithium-ion battery as an example. It should be understood that the embodiments disclosed in the present application are applicable to any other appropriate type of rechargeable battery. The battery mentioned in the embodiments disclosed in the present application can be directly or indirectly applied to an appropriate device to power the device.

[0040] The present application provides an electric device, which may include but is not limited to mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, etc. Among them, electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc., and spacecraft may include airplanes, rockets, space shuttles and spacecraft, etc. Among them, the electric device may include a battery, and the electric device may provide electric energy through the battery to realize the corresponding function.

[0041] The present application also provides an electric vehicle, which may include a battery.

[0042] Please refer to Figure 1 , Figure 1 is a schematic diagram of the structure of a vehicle according to one or more embodiments of the present application.

[0043] The vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle, etc. A battery 2 is arranged inside the vehicle 1, and the battery 2 may be arranged at the bottom, the head or the tail of the vehicle 1. The battery 2 may be used to power the vehicle 1, for example, the battery 2 may be used as an operating power source for the vehicle 1. The vehicle 1 may also include a controller 3 and a motor 4, and the controller 3 is used to control the battery 2 to power the motor 4, for example, for starting, navigating and driving the vehicle 1.

[0044] In some embodiments of the present application, the battery 2 can be used not only as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0045] In order to improve the performance of the electrical device, the present application also provides a battery, see Figure 2 , Figure 2 is a schematic diagram of the exploded structure of a battery according to one or more embodiments of the present application.

[0046] The shape of the battery may include but is not limited to a square, cylindrical or other arbitrary shapes.

[0047] In some embodiments, the battery 2 may include a box 20 and a battery cell 10, and the battery cell 10 is accommodated in the box 20. The box 20 is used to provide a storage space for the battery cell 10, and the box 20 can adopt a variety of structures. In some embodiments, the box 20 may include a first part 21 and a second part 22, and the first part 21 and the second part 22 cover each other, and the first part 21 and the second part 22 jointly define a storage space for accommodating the battery cell 10. The second part 22 may be a hollow structure with one end open, and the first part 21 may be a plate-like structure, and the first part 21 covers the open side of the second part 22, so that the first part 21 and the second part 22 jointly define a storage space; the first part 21 and the second part 22 may also be hollow structures with one side open, and the open side of the first part 21 covers the open side of the second part 22.

[0048] In the battery 2, there can be multiple battery cells 10, and the multiple battery cells 10 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 10 are both connected in series and in parallel. The multiple battery cells 10 can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 10 is accommodated in the box 20; of course, the battery 2 can also be a battery module formed by connecting multiple battery cells 10 in series, in parallel, or in mixed connection, and then the multiple battery modules are connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the box 20. The battery 2 can also include other structures, for example, the battery 2 can also include a busbar component for realizing electrical connection between the multiple battery cells 10.

[0049] The manufacturing methods of the battery cell 10 include stacking and winding, that is, the battery cell 10 is divided into stacking cells and winding cells. The stacking battery has a uniform current collection effect, a small internal resistance of the battery, and a large specific power, but in order to improve the precision, the mold precision is extremely high, the equipment investment is high, and the process is relatively complex, and the production efficiency is low. The winding battery is simple to make, and the equipment precision requirements for the production and assembly process are general, the production efficiency is high, and the cost is low. In terms of performance, the winding battery has excellent high and low temperature performance, charges very quickly, has an ultra-long life, a stable high output voltage, a solid structure, and strong shock resistance.

[0050] In a related embodiment, during use of the battery cell, the working status of the battery cell can be monitored by a built-in detection module, and the generated working status is then transmitted to the outside of the battery cell by wired transmission. However, the wired transmission method will make the overall wiring harness cumbersome, and it is necessary to further process the structure of the adaptable wiring harness on the battery cell, making the overall processing more difficult.

[0051] In order to solve the technical problems existing in the related art, the present application provides a battery cell, a light-transmitting component for light transmission is provided on the outer shell of the battery cell, and a detection module is built into the battery cell. The internal status data of the battery cell is detected by the detection module, and then the internal status data is converted into signal light by the detection module. The signal light is transmitted from the inside of the outer shell to the outside of the outer shell through the light-transmitting component, thereby replacing the traditional solution of transmitting the status data from the inside of the outer shell to the outside of the outer shell in a wired manner.

[0052] Specifically, see Figures 3 to 5 , Figure 3 is a schematic diagram of the exploded structure of a battery cell according to one or more embodiments of the present application, Figure 4 yes Figure 3 The schematic diagram of the top view of the battery cell shown in FIG. Figure 5 yes Figure 4 The first cross-sectional structure schematic diagram of the battery cell along the AA direction is shown.

[0053] The battery cell 10 includes a shell 100 and a detection module 200, the shell 100 includes a wall portion 110, and the wall portion 110 includes a light-transmitting component 300; the detection module 200 is arranged inside the shell 100, and the detection module 200 includes a detection element 220 and a first optical communication element 210, the detection element 220 is connected to the first optical communication element 210, the detection element 220 is used to detect the status data of the battery cell 10, and the first optical communication element 210 is used to transmit the signal light 211 generated according to the status data to the outside of the shell 100 through the light-transmitting component 300.

[0054] The wall portion 110 may be any side wall of the housing 100. For example, when the housing 100 is square, the parts corresponding to the six sides of the square housing 100 may be used as the wall portion 110 of this embodiment. When the housing 100 includes an end cap and a shell 120, the wall portion 110 may be an end cap. Specifically, the end cap refers to a component that covers the opening of the shell 120 to isolate the internal environment of the battery cell 10 from the external environment. Without limitation, the shape of the end cap may be adapted to the shape of the shell 120 to match the shell 120. Optionally, the end cap may be made of a material with a certain hardness and strength (such as an aluminum alloy), so that the end cap is not easily deformed when squeezed and collided, so that the battery cell 10 can have a higher structural strength and the safety performance can also be improved. In some embodiments, the end cap may also be provided with an explosion-proof part for releasing the internal pressure when the internal pressure or temperature of the battery cell 10 reaches a threshold. The material of the end cap may also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this. The shell 120 is a component used to cooperate with the end cap to form the internal environment of the battery cell 10, wherein the formed internal environment can be used to accommodate the electrode assembly 130, electrolyte and other components. The shell 120 and the end cap can be independent components, and an opening can be set on the shell 120, and the internal environment of the battery cell 10 is formed by covering the opening with the end cap at the opening. Without limitation, the end cap and the shell 120 can also be integrated. Specifically, the end cap and the shell 120 can form a common connection surface before other components are put into the shell, and when the interior of the shell 120 needs to be encapsulated, the end cap is covered with the shell 120. The battery cell 10 may also include an electrode assembly 130, which is a component in the battery cell 10 where an electrochemical reaction occurs. One or more electrode assemblies 130 may be included in the shell 120. The electrode assembly 130 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive and negative electrodes with active materials constitute the main body of the electrode assembly 130, and the parts of the positive and negative electrodes without active materials each constitute a tab. The positive tab and the negative tab may be located at one end of the main body or at both ends of the main body. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the tabs connect the electrode terminals to form a current loop.

[0055] The light-transmitting component 300 can allow light to pass through, for example, light can be transmitted from one side surface of the light-transmitting component 300 to the other side surface. The light-transmitting component 300 can be of any shape, and the light-transmitting component 300 can be embedded in the wall 110 of the housing 100, or the entire wall 110 can be used as the light-transmitting component 300, etc. The light-transmitting component 300 allows the light inside the housing 100 to be transmitted to the outside of the housing 100 through the light-transmitting component 300. The detection module 200 can be located inside the housing 100 as a whole, and the detection module 200 includes a detection element 220 and a first optical communication element 210. The detection element 220 can be used to detect the state data of the battery cell 10. For example, the state data may include but is not limited to temperature data, air pressure data, voltage data and / or impedance data, etc. The first optical communication element 210 includes but is not limited to an infrared optical communication element. The first optical communication element 210 can be used to receive or send a signal light 211, and the signal light 211 can penetrate the light-transmitting component 300 from the inside of the housing 100 to the outside of the housing 100. In some embodiments, after the detection element 220 detects the status data of the battery cell 10, the status data may be converted into signal light 211 by the detection element 220, and the signal light 211 may be transmitted through the light-transmitting component 300 to the outside of the housing 100 by the first optical communication element 210; or after the detection element 220 detects the status data of the battery cell 10, the status data may be transmitted to the first optical communication element 210, and the first optical communication element 210 converts the status data into signal light 211, and transmits the signal light 211 through the light-transmitting component 300 to the outside of the housing 100. The signal light 211 may be directly emitted to the light-transmitting component 300 to be directly emitted through the light-transmitting component 300, or other light-guiding elements may be provided, which are provided on the optical path of the signal light 211 to receive and guide the signal light 211 to the light-transmitting component 300. After the signal light 211 is transmitted to the outside of the housing 100, the signal light 211 may be received and demodulated by other modules to obtain the status data of the battery cell 10 in a wireless manner.

[0056] Through the above-mentioned embodiment, the status data of the battery cell 10 is detected by the built-in detection element 220, and the first optical communication element 210 transmits the signal light 211 generated according to the status data to the outside of the outer shell 100 through the light-transmitting component 300, so as to transmit the battery status data to the outside of the battery cell 10 by wireless transmission. Compared with the wired transmission method, the complexity of the wiring harness in the battery cell 10 can be further reduced, and there is no need to open an additional through hole on the outer shell 100 for passing the wiring harness, thereby reducing the overall processing difficulty.

[0057] In some embodiments, the detection element 220 includes one or more of a temperature sensor, an air pressure sensor, a voltage sensor, and an impedance sensor. Thus, the detection element 220 includes one or more of a temperature sensor, an air pressure sensor, a voltage sensor, and an impedance sensor, which is conducive to targeted detection of the working state of the battery cell 10 and facilitates targeted management of the battery cell 10.

[0058] Furthermore, the light-transmitting component 300 penetrates the opposite surfaces of the wall portion 110 in the thickness direction of the wall portion 110. The light-transmitting component 300 may be in any shape, for example, the light-transmitting component 300 may be cylindrical, prism-shaped, truncated cone-shaped, conical, inclined column-shaped, etc. The light-transmitting component 300 penetrates the opposite surfaces of the wall portion 110 in the thickness direction of the wall portion 110, that is, the light-transmitting component 300 is simultaneously exposed inside and outside the housing 100. When the signal light 211 is incident on the light-transmitting component 300 from the inside of the housing 100, it can be emitted to the outside of the housing 100 through the light-transmitting component 300, thereby transmitting the status data of the battery cell 10 from the inside of the housing 100 to the outside of the housing 100 by wireless transmission, so as to improve the transmission efficiency of the signal light 211.

[0059] See also Figure 6 , Figure 6 yes Figure 4 The second cross-sectional structure schematic diagram of the battery cell 10 along the AA direction is shown.

[0060] The wall portion 110 is provided with a mounting hole 111 penetrating the wall portion 110 in the thickness direction. The light-transmitting component 300 includes a first light-transmitting portion 310 and a second light-transmitting portion 320 connected to each other. The first light-transmitting portion 310 is embedded in the mounting hole 111, and the second light-transmitting portion 320 is connected to the side of the wall portion 110 facing the outside of the housing 100, or the second light-transmitting portion 320 is connected to the side of the wall portion 110 facing the inside of the housing 100. The first light-transmitting portion 310 and the second light-transmitting portion 320 can be columnar, table-shaped, conical, etc. The shape of the mounting hole 111 can match the shape of the first light-transmitting portion 310, and the radial dimension of the mounting hole 111 can be slightly larger than the radial dimension of the first light-transmitting portion 310, so that the first light-transmitting portion 310 can be inserted into the mounting hole 111, and the outer wall of the first light-transmitting portion 310 is tightly fitted with the inner wall of the mounting hole 111. The radial dimension of the second light-transmitting portion 320 may be greater than the radial dimension of the first light-transmitting portion 310. When the first light-transmitting portion 310 is inserted into the mounting hole 111, the second light-transmitting portion 320 may overlap the side of the wall portion 110 facing the outside of the housing 100, or overlap the side of the wall portion 110 facing the inside of the housing 100, so that the light-transmitting component 300 and the wall portion 110 remain relatively fixed. For example, the second light-transmitting portion 320 may be fixedly connected to the wall portion 110 by bonding, welding or melting.

[0061] Furthermore, the light-transmitting component 300 also includes a third light-transmitting portion 330, and the second light-transmitting portion 320 and the third light-transmitting portion 330 are respectively connected to the two ends of the first light-transmitting portion 310 in the thickness direction, and one of the second light-transmitting portion 320 and the third light-transmitting portion 330 is connected to the side of the wall portion 110 facing the outside of the shell 100, and the other is connected to the side of the wall portion 110 facing the inside of the shell 100. The third light-transmitting portion 330 and the second light-transmitting portion 320 are respectively located at two ends of the first light-transmitting portion 310, and the radial dimensions of the third light-transmitting portion 330 and the second light-transmitting portion 320 can be larger than the radial dimensions of the first light-transmitting portion 310, so that the common cross-sectional schematic diagram of the first light-transmitting portion 310, the second light-transmitting portion 320 and the third light-transmitting portion 330 presents an I-shape. The first light-transmitting portion 310 is located in the mounting hole 111, and one of the second light-transmitting portion 320 and the third light-transmitting portion 330 is connected to the side of the wall portion 110 facing the outside of the housing 100, and the other is connected to the side of the wall portion 110 facing the inside of the housing 100, which can further improve the stability of the connection between the light-transmitting component 300 and the wall portion 110.

[0062] See also Figure 7 , Figure 7 yes Figure 4 The third cross-sectional structure schematic diagram of the battery cell 10 along the AA direction is shown.

[0063] The wall portion 110 is provided with a mounting hole 111 penetrating the wall portion 110 along the thickness direction of the wall portion 110. The light-transmitting component 300 further includes a light-transmitting body 340 and a sealing member 400. The sealing member 400 is arranged around the circumference of the light-transmitting body 340. The light-transmitting body 340 is embedded in the mounting hole 111 through the sealing member 400. The light-transmitting body 340 can allow light to pass through, for example, light can be transmitted from one side surface of the light-transmitting body 340 to the other side surface. The sealing member 400 can be a sealing plastic. The sealing member 400 can be annular, and the annular sealing member 400 is sleeved on a part of the outer circumference of the light-transmitting body 340; or the sealing member 400 can be sleeve-shaped, and the sleeve-shaped sealing member 400 can be sleeved on the entire outer circumference of the light-transmitting body 340. The shape of the mounting hole 111 can match the shape of the sealing member 400, and the radial dimension of the mounting hole 111 can be slightly larger than the radial dimension of the sealing member 400, so that when the light-transmitting body 340 is embedded in the mounting hole 111 through the sealing member 400, the outer wall of the sealing member 400 is tightly fitted with the inner wall of the mounting hole 111. Thus, the sealing member 400 is arranged around the circumference of the light-transmitting body 340, so that the light-transmitting body 340 is embedded in the mounting hole 111 through the sealing member 400, the stability of the installation of the light-transmitting body 340, and the sealing effect of the mounting hole 111 are improved, and the risk of leakage of the electrolyte inside the battery cell 10 from the mounting hole 111 is alleviated.

[0064] Further, the sealing member 400 includes a sealing body 410 and a sealing connection part 420. The sealing body 410 is provided with a mounting groove 430, the notch of the mounting groove 430 faces the outside of the housing 100, the light-transmitting body 340 is arranged in the mounting groove 430, and the sealing connection part 420 is connected to the side of the wall part 110 facing the outside of the housing 100. The sealing body 410 can be in the shape of a hollow column, the hollow part forms the mounting groove 430, the light-transmitting body 340 is arranged in the mounting groove 430, and the light-transmitting body 340 is limited by the bottom wall of the mounting groove 430, and the shape of the mounting groove 430 can match the shape of the light-transmitting body 340, and the radial dimension of the mounting groove 430 is slightly larger than the radial dimension of the light-transmitting body 340, so that the light-transmitting body 340 can be stably embedded in the mounting groove 430. The outer diameter of the sealing body 410 may be slightly smaller than the inner diameter of the mounting hole 111, so that when the light-transmitting body 340 is embedded in the mounting hole 111 through the sealing body 410, the outer wall of the sealing body 410 is closely fitted with the inner wall of the mounting hole 111. The sealing connection part 420 is connected to the side of the sealing body 410 close to the outside of the housing 100, and the sealing connection part 420 may be arranged around the outer periphery of the sealing body 410 and extend outward. When the sealing body 410 is inserted into the mounting hole 111, the sealing connection part 420 may overlap the side of the wall 110 facing the outside of the housing 100, so that the sealing member 400 and the wall 110 remain relatively fixed, for example, the sealing connection part 420 may be fixedly connected to the wall 110 by bonding or welding, so that the fixing method of the light-transmitting component 300 can be simplified by the sealing member 400, and the installation efficiency can be improved.

[0065] Furthermore, a light-transmitting hole 411 is provided on the bottom wall of the mounting groove 430, the light-transmitting hole 411 communicates the interior of the housing 100 and the mounting groove 430, the light-transmitting body 340 covers the light-transmitting hole 411, and the signal light 211 is transmitted to the exterior of the housing 100 through the light-transmitting hole 411 and the light-transmitting body 340. The size of the light-transmitting hole 411 can be set according to actual conditions, and the radial dimension of the light-transmitting hole 411 can be smaller than the radial dimension of the light-transmitting body 340, so that the light-transmitting body 340 can be carried in the mounting groove 430. When the light-transmitting hole 411 is carried in the mounting groove 430, the light-transmitting body 340 can cover the light-transmitting hole 411. When the first optical communication element 210 emits the signal light 211, the signal light 211 can be incident on the light-transmitting body 340 from one side of the light-transmitting body 340 through the light-transmitting hole 411, and emitted from the other side of the light-transmitting body 340, so that the signal light 211 is convenient to be transmitted from the inside of the battery cell 10 to the outside of the battery cell 10 through the light-transmitting component 300, thereby improving the transmission stability of the signal light 211.

[0066] In some embodiments, the mounting hole 111 is a liquid injection hole. The liquid injection hole can be understood as a through hole that penetrates the wall portion 110. During the production process of the battery cell 10, electrolyte can be injected into the housing 100 through the liquid injection hole. By directly using the liquid injection hole as the mounting hole 111, there is no need to open an additional mounting hole 111 on the wall portion 110 to accommodate the light-transmitting component 300, making the overall structure simpler.

[0067] See also Figure 8 , Figure 8 yes Figure 4 The fourth cross-sectional structure schematic diagram of the battery cell 10 along the AA direction is shown.

[0068] The battery cell 10 also includes a lower plastic part 800, which is arranged on the side of the wall 110 facing the inside of the shell 100, and the lower plastic part 800 is provided with a receiving groove 810, the notch of the receiving groove 810 faces the wall 110, and the detection module 200 is arranged in the receiving groove 810. The lower plastic part 800 can be prefabricated by plastic or assembled by various plastic parts, and the material of the lower plastic part 800 can include insulating material. The lower plastic part 800 can provide insulation performance and improve the electrical insulation between the inside of the shell 100 and the wall 110. In addition, the lower plastic part 800 can also fix and protect the electrode assembly 130 inside the shell 100, reducing the risk of disconnection caused by displacement of the components such as the electrode assembly 130 inside the shell 100 during transportation and use of the battery cell 10, especially in a vibration environment. The connection method between the lower plastic part 800 and the wall 110 includes but is not limited to welding, bonding or clamping. Specifically, a plurality of protrusions may be provided on the side of the lower plastic part 800 facing the wall part 110, and holes may be provided on the wall part 110 corresponding to the protrusions. When the lower plastic part 800 is attached to the wall part 110, the protrusions are inserted into the holes, thereby achieving the purpose of connecting the lower plastic part 800 and the wall part 110. The notch of the receiving groove 810 faces the wall part 110, so that when the lower plastic part 800 is attached to the wall part 110, the detection module 200 can be installed in the receiving groove 810 as a whole, so that the detection module 200 is carried by the lower plastic part 800, which can simplify the complexity of installing and fixing the detection module 200.

[0069] See also Fig. 9 , Fig. 9 yes Figure 4 The fifth cross-sectional structure schematic diagram of the battery cell 10 along the AA direction is shown.

[0070] The battery cell 10 further includes an electrode column 140 and a first conductive member 600. The electrode column 140 is provided through the wall portion 110. The first conductive member 600 is located inside the housing 100 and is respectively connected to the electrode column 140 and the detection module 200 so that the electrode column 140 and the detection module 200 form a current loop. The electrode column 140 can be used to connect the battery cell 10 with an external circuit to serve as a charging and discharging interface of the battery cell 10. Specifically, the electrode column 140 is provided through the wall portion 110. One end of the electrode column 140 located outside the housing 100 can be electrically connected to an external device, and one end of the electrode column 140 located inside the housing 100 can be electrically connected to the pole ear of the electrode assembly 130 to form a current loop so that the battery cell 10 can be charged or discharged through the electrode column 140. The first conductive member 600 may be a structure such as a wire or a conductive sheet. The first conductive member 600 may be respectively connected to the detection module 200 and the electrode column 140, so that the electrode column 140 and the detection module 200 may form a current loop through the first conductive member 600, and then the detection module 200 may be powered on through the electrode column 140, thereby reducing the difficulty of powering the detection module 200.

[0071] Further, the electrode column 140 also includes a positive column 141 and a negative column 142, the positive column 141 and the negative column 142 are respectively arranged in the wall portion 110, the detection module 200 is arranged between the positive column 141 and the negative column 142, and the first conductive member 600 includes two first wires 610, one first wire 610 connects the positive column 141 and the detection module 200, and the other first wire 610 connects the negative column 142 and the detection module 200. The detection module 200, the positive column 141 and the negative column 142 can be located on the same straight line, the detection module 200 can be located in the middle of the positive column 141 and the negative column 142, or the detection module 200 can be arranged closer to the negative column 142 or closer to the positive column 141, so that the harness length of the two first wires 610 can be reduced at the same time, the complexity of the harness layout can be simplified, and the power supply difficulty of the detection module 200 can be reduced.

[0072] In some embodiments, the battery cell 10 further includes a data processing module 500, which is disposed outside the housing 100. The data processing module 500 includes a second optical communication element 510 and a data processing element 520 connected to each other, the second optical communication element 510 is used to receive the signal light 211, and the data processing element 520 is used to receive the data generated according to the signal light 211. The data processing module 500 can be fixedly mounted on the surface of the wall portion 110 facing the outside of the housing 100. The second optical communication element 510 includes but is not limited to an infrared optical communication element, and the second optical communication element 510 can be used to receive or emit the signal light 211. The signal light 211 emitted by the first optical communication element 210 penetrates the light-transmitting component 300 from the inside of the housing 100 to the outside of the housing 100 and is received by the second optical communication element 510. In some embodiments, after receiving the signal light 211, the second optical communication element 510 can convert the signal light 211 into the status data of the battery cell 10, and then transmit the status data to the data processing element 520, so that the data processing element 520 receives the data generated according to the signal light 211. When it is necessary to control the detection module 200 for data collection, the second optical communication element 510 can emit light to the first optical communication element 210, and then the first optical communication element 210 demodulates the light to obtain a control signal, so that the detection element 220 can detect the state data of the battery cell 10 according to the control signal. Therefore, the data processing module 500 is arranged outside the housing 100, so that the second optical communication element 510 can receive the signal light 211 outside the housing 100, and receive the state data of the battery cell 10 through the data processing element 520, so as to realize the transmission and reception of the battery cell 10 data by optical signal transmission. Compared with the wired transmission method, it can further reduce the complexity of the wiring harness in the battery cell 10, and there is no need to open an additional through hole on the housing 100 for passing the wiring harness, thereby reducing the overall processing difficulty.

[0073] Further, the first optical communication element 210, the light-transmitting component 300, and the second optical communication element 510 are sequentially arranged in the thickness direction of the wall portion 110. That is, the first optical communication element 210, the light-transmitting component 300, and the second optical communication element 510 are all located in the thickness direction of the wall portion 110, so that the second optical communication element 510 can receive the signal light 211, which can reduce the transmission path of the signal light 211, improve the reception efficiency of the signal light 211, and thus improve the overall data transmission efficiency.

[0074] In some embodiments, the battery cell 10 further includes an electrode column 140 and a second conductive member 700. The electrode column 140 is disposed through the wall portion 110. The second conductive member 700 is located outside the housing 100 and is respectively connected to the electrode column 140 and the data processing module 500, so that the electrode column 140 and the data processing module 500 form a current loop. The electrode column 140 can be used to connect the battery cell 10 with an external circuit to serve as a charging and discharging interface of the battery cell 10. Specifically, the electrode column 140 is disposed through the wall portion 110. One end of the electrode column 140 located outside the housing 100 can be electrically connected to an external device, and one end of the electrode column 140 located inside the housing 100 can be electrically connected to the pole ear of the electrode assembly 130 to form a current loop, so that the battery cell 10 can be charged or discharged through the electrode column 140. The second conductive member 700 may be a structure such as a wire or a conductive sheet. The second conductive member 700 may be connected to the data processing module 500 and the electrode column 140 respectively, so that the electrode column 140 and the data processing module 500 may form a current loop through the second conductive member 700, and then the data processing module 500 may be powered on through the electrode column 140, thereby reducing the difficulty of powering the data processing module 500.

[0075] Furthermore, the electrode column 140 also includes a positive electrode column 141 and a negative electrode column 142, the positive electrode column 141 and the negative electrode column 142 are respectively penetrated through the wall 110, the data processing module 500 is arranged between the positive electrode column 141 and the negative electrode column 142, and the second conductive member 700 includes two second wires 710, one second wire 710 connects the positive electrode column 141 and the data processing module 500, and the other second wire 710 connects the negative electrode column 142 and the data processing module 500. The data processing module 500, the positive pole 141 and the negative pole 142 can be located on the same straight line, the data processing module 500 can be located in the middle of the positive pole 141 and the negative pole 142, or the data processing module 500 can be arranged closer to the negative pole 142 or closer to the positive pole 141, thereby reducing the wiring harness length of the two second wires 710 at the same time, simplifying the complexity of the wiring harness layout, and reducing the difficulty of power supply to the data processing module 500.

[0076] In some embodiments, the data processing module 500 further includes a wireless communication element 530, which is connected to the data processing element 520, and the wireless communication element 530 is used to transmit the data generated by the signal light 211 to an external device. The wireless communication element 530 is connected to the data processing element 520 for communication, which can facilitate data transmission between the data processing element 520 and the wireless communication element 530. The wireless communication element 530 can communicate with an external device wirelessly, wherein the wireless communication method may include but is not limited to Bluetooth, wifi, near field communication (NFC), etc., and the external device may include but is not limited to a battery management system or a vehicle-mounted central control system, etc. After the wireless communication element 530 receives the data generated by the signal light 211, it can send relevant data to the external device by wireless transmission, or receive relevant instructions issued by the external device by wireless transmission, etc. Therefore, the data generated by the signal light 211 can be transmitted to the external device through the wireless communication element 530, which can reduce the complexity of the wiring harness and make the entire communication method more concise compared to the wired transmission method.

[0077] To summarize, the status data of the battery cell 10 is detected by the built-in detection element 220, and the first optical communication element 210 transmits the signal light 211 generated according to the status data to the outside of the outer shell 100 through the light-transmitting component 300, so as to transmit the battery status data to the outside of the battery cell 10 by wireless transmission. Compared with the wired transmission method, the complexity of the wiring harness in the battery cell 10 can be further reduced, and there is no need to open an additional through hole on the outer shell 100 for passing the wiring harness, thereby reducing the overall processing difficulty.

[0078] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0079] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0080] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0081] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0082] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0083] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: The battery cell comprises: A housing including a wall portion, wherein the wall portion includes a light-transmitting component; A detection module is arranged inside the shell, and the detection module includes a detection element and a first optical communication element. The detection element is connected to the first optical communication element, and the detection element is used to detect the status data of the battery cell. The first optical communication element is used to transmit the signal light generated according to the status data to the outside of the shell through the light-transmitting component.

2. The battery cell according to claim 1, characterized in that: The light-transmitting component penetrates through two opposite side surfaces of the wall portion in the thickness direction of the wall portion.

3. The battery cell according to claim 2, characterized in that: The wall portion is provided with a mounting hole which penetrates the wall portion along the thickness direction, and the light-transmitting component includes a first light-transmitting portion and a second light-transmitting portion which are connected to each other, the first light-transmitting portion is embedded in the mounting hole, and the second light-transmitting portion is connected to the side of the wall portion facing the outside of the shell, or the second light-transmitting portion is connected to the side of the wall portion facing the inside of the shell.

4. The battery cell according to claim 3, characterized in that: The light-transmitting component also includes a third light-transmitting portion, the second light-transmitting portion and the third light-transmitting portion are respectively connected to two ends of the first light-transmitting portion in the thickness direction, one of the second light-transmitting portion and the third light-transmitting portion is connected to the side of the wall portion facing the outside of the shell, and the other is connected to the side of the wall portion facing the inside of the shell.

5. The battery cell according to claim 1, characterized in that: The wall portion is provided with a mounting hole penetrating the wall portion along the thickness direction of the wall portion, and the light-transmitting component further comprises a light-transmitting body and a sealing member, wherein the sealing member is arranged around the circumference of the light-transmitting body, and the light-transmitting body is embedded in the mounting hole through the sealing member.

6. The battery cell according to claim 5, characterized in that: The sealing member comprises a sealing main body and a sealing connection part, the sealing main body is provided with a mounting groove, the notch of the mounting groove faces the outside of the shell, the light-transmitting main body is arranged in the mounting groove, and the sealing connection part is connected to the side of the wall part facing the outside of the shell.

7. The battery cell according to claim 6, characterized in that: The bottom wall of the mounting groove is provided with a light-transmitting hole, the light-transmitting hole communicates the inside of the shell and the mounting groove, the light-transmitting body covers the light-transmitting hole, and the signal light is transmitted to the outside of the shell through the light-transmitting hole and the light-transmitting body.

8. The battery cell according to claim 3, characterized in that: The mounting hole is a liquid injection hole.

9. The battery cell according to claim 1, characterized in that: The battery cell further includes an electrode column and a first conductive member. The electrode column is disposed through the wall portion. The first conductive member is located inside the shell and is respectively connected to the electrode column and the detection module so that the electrode column and the detection module form a current loop.

10. The battery cell according to claim 9, characterized in that: The electrode column also includes a positive electrode column and a negative electrode column, the positive electrode column and the negative electrode column are respectively penetrated through the wall portion, the detection module is arranged between the positive electrode column and the negative electrode column, and the first conductive member includes two first wires, one of the first wires connects the positive electrode column and the detection module, and the other first wire connects the negative electrode column and the detection module.

11. The battery cell according to claim 1, characterized in that: The battery cell further comprises a lower plastic part, which is arranged on a side of the wall portion facing the inside of the shell, and is provided with a receiving groove, the notch of which faces the wall portion, and the detection module is arranged in the receiving groove.

12. The battery cell according to claim 1, characterized in that: The battery cell also includes a data processing module, which is arranged outside the shell. The data processing module includes a second optical communication element and a data processing element connected to each other, the second optical communication element is used to receive the signal light, and the data processing element is used to receive data generated according to the signal light.

13. The battery cell according to claim 12, characterized in that: The first optical communication element, the light-transmitting member, and the second optical communication element are arranged in this order in the thickness direction of the wall portion.

14. The battery cell according to claim 12, characterized in that: The battery cell also includes an electrode column and a second conductive member, wherein the electrode column passes through the wall portion, and the second conductive member is located outside the shell and is respectively connected to the electrode column and the data processing module to form a current loop.

15. The battery cell according to claim 14, characterized in that: The electrode column also includes a positive electrode column and a negative electrode column, the positive electrode column and the negative electrode column are respectively penetrated through the wall portion, the data processing module is arranged between the positive electrode column and the negative electrode column, and the second conductive member includes two second wires, one second wire connects the positive electrode column and the data processing module, and the other second wire connects the negative electrode column and the data processing module.

16. The battery cell according to claim 12, characterized in that: The data processing module further includes a wireless communication element, which is connected to the data processing element and is used to transmit the data generated by the signal light to an external device.

17. The battery cell according to any one of claims 1 to 16, characterized in that: The detection element includes one or more of a temperature sensor, an air pressure sensor, a voltage sensor and an impedance sensor.

18. A battery, characterized in that: The battery comprises a battery cell as claimed in any one of claims 1 to 17.

19. An electrical device, characterized in that: The electrical device comprises the battery as claimed in claim 18.

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