Battery sampling device, battery management system and battery control method

Abstract

The embodiment of the invention provides a battery sampling device, a battery management system and a battery control method, the device comprises an optical communication module and a smoke detection module, and the optical communication module is used for generating a first optical signal; the smoke detection module is used for receiving the first optical signal which is at least partially scattered by the smoke, and the first optical signal which is at least partially scattered by the smoke and received by the smoke detection module is used for determining a smoke detection result of the battery. The smog detection module is integrated in the battery sampling device, smog is directly detected by combining the scattering effect of smog on light, and the method is high in smog response speed and high in sensitivity; moreover, the method does not depend on the quality of optical communication singly, avoids the error detection caused by the influence of non-smoke reasons, such as ambient light, on the quality of optical communication, and improves the accuracy of smoke detection.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of battery management, and in particular to a battery sampling device, a battery management system and a battery control method. BACKGROUND

[0002] Battery thermal runaway is usually accompanied by temperature rise and generation of a large amount of smoke and flammable gas. Therefore, smoke detection can be a key indicator for early warning of thermal runaway.

[0003] Currently, by deploying multiple battery sampling modules inside the battery pack, smoke detection is performed based on the communication quality between the multiple battery sampling modules, so as to determine the thermal runaway state. The influence of ambient light on the communication quality can cause false detection. SUMMARY

[0004] The embodiments of the present application provide a battery sampling device, a battery management system and a battery control method, so as to achieve the effect of accurately detecting and monitoring the state of the battery.

[0005] In a first aspect, the embodiments of the present application provide a battery sampling device, which comprises:

[0006] An optical communication module, the optical communication module is configured to generate a first optical signal;

[0007] A smoke detection module, the smoke detection module is configured to receive at least part of the first optical signal scattered by the smoke, and the at least part of the first optical signal scattered by the smoke received by the smoke detection module is used to determine a smoke detection result of the battery.

[0008] In a possible implementation, the battery sampling device further comprises:

[0009] A first controller, the first controller is connected with the smoke detection module, and is configured to determine the smoke detection result of the battery according to the at least part of the first optical signal scattered by the smoke received by the smoke detection module; or,

[0010] The first controller is configured to send the at least part of the first optical signal scattered by the smoke received by the smoke detection module, so as to determine the smoke detection result of the battery.

[0011] In a possible implementation, the smoke detection module comprises:

[0012] A first photoelectric conversion unit, the first photoelectric conversion unit is configured to receive the at least part of the first optical signal scattered by the smoke, and convert the at least part of the first optical signal scattered by the smoke into a first electrical signal;

[0013] The first controller is electrically connected with the first photoelectric conversion unit, and the first controller is configured to determine the smoke detection result of the battery according to the first electrical signal; or,

[0014] The first electric signal is used for transmitting to determine the smoke detection result of the battery.

[0015] In a possible implementation, the first photoelectric conversion unit comprises:

[0016] The first light signal receiving device is used for receiving the first light signal scattered by the smoke at least in part and converting into a second electric signal.

[0017] The first conversion circuit is connected with the first light signal receiving device and used for converting and / or amplifying the second light signal to obtain the first electric signal.

[0018] In a possible implementation, the smoke detection module further comprises:

[0019] The optical detection cavity is used for containing the smoke generated by the battery, and the first light-transmitting hole and the second light-transmitting hole are arranged on the optical detection cavity. The first light signal can pass through the first light-transmitting hole to enter the optical detection cavity, and the second light signal remaining after the first light signal is scattered by the smoke in the optical detection cavity can pass through the second light-transmitting hole to exit.

[0020] The first photoelectric conversion unit is arranged in the optical detection cavity.

[0021] In a possible implementation, the optical communication module comprises a first light emitting unit; the first light emitting unit comprises:

[0022] The first light signal generating device is used for generating the first light signal.

[0023] The driving circuit is connected with the first light signal generating device and used for driving the first light signal generating device to generate the first light signal.

[0024] In a possible implementation, the battery sampling device further comprises:

[0025] The first controller is connected with the driving circuit and used for outputting the sampling information to enable the driving circuit to drive the first light signal generating device to generate the first light signal.

[0026] In a possible implementation, the optical communication module further comprises:

[0027] The second photoelectric conversion unit is used for receiving the second light signal and converting into a third electric signal, and the second light signal is the first light signal remaining after being scattered by the smoke.

[0028] In a possible implementation, the battery sampling device further comprises:

[0029] The second controller is connected with the second photoelectric conversion unit and used for transmitting the second light signal based on the third electric signal to determine the bit error rate of the second light signal, and the bit error rate is used for starting the smoke detection module.

[0030] In a possible implementation, the second photoelectric conversion unit comprises:

[0031] A second optical signal receiving device is configured to receive the second optical signal and convert the second optical signal into a fourth electrical signal.

[0032] A second conversion circuit is connected to the second optical signal receiving device and configured to convert and / or amplify the fourth optical signal to obtain a third electrical signal.

[0033] In a second aspect, the embodiments of the present application provide a battery management system, which comprises at least one battery sampling device as in the first aspect and / or various possible embodiments of the first aspect.

[0034] The battery sampling device is configured to determine a smoke detection result of the battery according to the received first optical signal at least partially scattered by the smoke.

[0035] In a possible implementation, the battery management system further comprises:

[0036] A control device is connected to the at least one battery sampling device in sequence to form a ring-shaped optical communication network.

[0037] The battery sampling device is configured to send the received first optical signal at least partially scattered by the smoke to the control device, and the control device is configured to determine a smoke detection result of the battery according to the received first optical signal at least partially scattered by the smoke; or

[0038] The battery sampling device is configured to determine a smoke detection result of the battery according to the received first optical signal at least partially scattered by the smoke, and send the smoke detection result to the control device.

[0039] In a possible implementation, the battery management system comprises a plurality of battery sampling devices, and the plurality of battery sampling devices are connected in sequence by a laser beam.

[0040] In a possible implementation, the battery management system further comprises at least one optical path processing device, each optical path processing device is located between two adjacent battery sampling devices, and is configured to change a direction of the laser beam to form the ring-shaped optical communication network.

[0041] In a possible implementation, the optical path processing device comprises an optical path turning prism.

[0042] In a possible implementation, the control device and the at least one battery sampling device are connected by a light guide medium.

[0043] In a third aspect, the embodiments of the present application provide a battery control method, which comprises:

[0044] The smoke detection result of the battery is determined according to the intensity of the received first light signal scattered by the smoke.

[0045] In a possible implementation, the method further includes:

[0046] The error code rate of the second light signal is determined, and the error code rate is used to start the smoke detection module, and the second light signal is the first light signal remaining after being scattered by the smoke.

[0047] In a possible implementation, the method further includes:

[0048] In a case where the error code rate is greater than or equal to the first threshold value, the smoke detection module is controlled to be started;

[0049] In a case where the error code rate is less than the first threshold value, the smoke detection module is kept from being started.

[0050] In a possible implementation, the smoke detection result of the battery is determined according to the intensity of the received first light signal scattered by the smoke, and includes:

[0051] In a case where the intensity of the received first light signal scattered by the smoke is greater than a second threshold value, the smoke detection result of the battery is determined to be that there is smoke;

[0052] In a case where the intensity of the received first light signal scattered by the smoke is less than or equal to the first threshold value, the smoke detection result of the battery is determined to be that there is no smoke.

[0053] In a possible implementation, the method further includes:

[0054] In a case where the smoke detection result of the battery is determined to be that there is smoke, a smoke alarm is triggered; and / or,

[0055] In a case where the smoke detection result of the battery is determined to be that there is no smoke, a communication exception alarm is triggered.

[0056] In a fourth aspect, an embodiment of the present application provides a battery system, including the battery management system and the battery in the second aspect and / or possible implementation of the second aspect.

[0057] In a fifth aspect, an embodiment of the present application provides a vehicle, including the battery management system in the second aspect, or including the battery system in the fourth aspect, or including the battery sampling device in the first aspect.

[0058] In a sixth aspect, an embodiment of the present application provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the battery control method.

[0059] In a seventh aspect, embodiments of this application provide a computer program product, including a computer program, characterized in that the computer program, when executed by a processor, implements the above-described battery control method.

[0060] The battery sampling device, battery management system, and battery control method provided in this application include an optical communication module and a smoke detection module. The optical communication module generates a first optical signal, and the smoke detection module receives the first optical signal that is at least partially scattered by smoke. The first optical signal received by the smoke detection module is used to determine the smoke detection result of the battery. By integrating a smoke detection module into the battery sampling device and directly detecting smoke by combining the scattering effect of smoke on light, this method has a fast response speed and high sensitivity to smoke. Furthermore, it no longer relies solely on the quality of optical communication, avoiding false detections caused by the influence of ambient light and other non-smoke factors on the quality of optical communication, thereby improving the accuracy of smoke detection. Attached Figure Description

[0061] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0062] Figure 1 Schematic diagram of the battery sampling device provided in this application Figure One ;

[0063] Figure 2 Schematic diagram of the battery sampling device provided in this application Figure Two ;

[0064] Figure 3 Schematic diagram of the battery sampling device provided in this application Figure Three ;

[0065] Figure 4 Schematic diagram of the battery sampling device provided in this application Figure Four ;

[0066] Figure 5 Schematic diagram of the battery sampling device provided in this application Figure Five ;

[0067] Figure 6 Schematic diagram of the battery sampling device provided in this application Figure Six ;

[0068] Figure 7 A schematic diagram showing the installation location of the battery sampling device provided in this application;

[0069] Figure 8 A communication diagram of the multiple battery sampling devices provided in this application;

[0070] Figure 9 A schematic diagram of an optical path structure of a battery pack provided for the present application is shown in FIG. 1.

[0071] Figure 10 A flowchart of a battery control method provided for the present application is shown in FIG. 2. Figure One

[0072] Figure 11 A schematic diagram of an electronic device provided for the present application is shown in FIG. 3.

[0073] Reference signs:

[0074] 100 - optical communication module

[0075] 101 - first light emitting unit

[0076] 1011 - first light signal generating device

[0077] 1012 - driving circuit

[0078] 102 - second photoelectric conversion unit

[0079] 1021 - second light signal receiving device

[0080] 1022 - second conversion circuit

[0081] 103 - second light emitting unit

[0082] 104 - third photoelectric conversion unit

[0083] 200 - smoke detection module

[0084] 201 - first photoelectric conversion unit

[0085] 2011 - first light signal receiving device

[0086] 2012 - first conversion circuit

[0087] 202 - optical detection cavity

[0088] 300 - first controller

[0089] 400 - second controller

[0090] 601 - first AFE chip

[0091] 602 - second AFE chip

[0092] 603 - first signal driving circuit

[0093] 604 - first signal conversion amplification circuit

[0094] 605 - second signal driving circuit​

[0095] 606 - second signal conversion amplification circuit;

[0096] 607 - smoke chamber;

[0097] 608 - third signal conversion amplification circuit.

[0098] The specific embodiments of the application have been shown by way of example in the above figures, and will be described in more detail hereafter. These figures and this written description are not intended to limit the scope of this application in any way, but rather to illustrate various aspects of the application to those of ordinary skill in the art. DETAILED DESCRIPTION

[0099] The exemplary embodiments will be described in detail herein with reference to the attached drawings. In the following description, like reference numerals refer to like elements, unless the context clearly dictates otherwise. The following exemplary embodiments are described in the context of the accompanying drawings. These embodiments are not meant to represent all embodiments in accordance with the present application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the present application as detailed in the appended claims.

[0100] In the description of the present application, the terms "first", "second", etc., are used only to describe the purpose and are not to be construed as indicating or implying relative importance or a specific number of the indicated technical features. Thus, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0101] First, the following terms involved in the embodiments are explained:

[0102] PD: Photo Diode, photodiode;

[0103] LD: Laser Diode, laser diode;

[0104] AFE (Analog Front-end) chip: analog front-end chip.

[0105] In recent years, the electric vehicle market has maintained strong growth momentum, and the safety state monitoring of power batteries has become increasingly important. Among them, battery thermal runaway refers to the phenomenon that the battery, under abnormal conditions such as charging and discharging, causes internal temperature and current to circulate viciously, leading to rapid accumulation of heat and triggering uncontrollable chain reactions, which may eventually cause serious safety accidents such as burning and explosion. Battery thermal runaway is usually accompanied by temperature rise and the generation of a large amount of smoke and flammable gas. Therefore, smoke detection can be a key indicator for early warning of thermal runaway.

[0106] In a battery pack, a battery management system includes a plurality of battery sampling devices for monitoring the voltage, temperature, current, etc. of each cell or module in real time, thereby performing health management, risk monitoring, and dynamic adjustment, etc. to achieve the three goals of safety, durability, and high efficiency of the battery system. Taking an electric vehicle as an example, its battery pack includes a plurality of modules, and each module contains a plurality of cells. Usually, each module is equipped with a battery sampling device responsible for the voltage and temperature sampling of all cells in the module. The battery sampling device uploads data to a control device through CAN bus or daisy chain communication, and the control device makes unified decisions.

[0107] Currently, a plurality of battery sampling devices and control devices communicate with each other in an optoelectronic wireless communication manner. Based on the interference of smoke on light signals, the quality of the communication signals is detected to realize smoke detection inside the battery pack and further heat runaway monitoring. However, when the battery pack is installed in an environment with complex light conditions, such as outdoors or strong light irradiation areas, the ambient light will interfere with the receiving signals of the optoelectronic sensor, leading to misjudgment of the smoke detection. Moreover, the ambient light can change rapidly over time, such as cloud movement, vehicle light flickering, etc., affecting the stability of the optical communication signals, making it difficult for the smoke detection algorithm to distinguish between real smoke signals and ambient light noise. In addition, the internal structure of the battery pack is complex, and the optical communication can be physically blocked by the battery module, heat dissipation structure, etc., affecting signal transmission and leading to misjudgment of the smoke detection.

[0108] To solve the above technical problems, the embodiments of the present application provide a battery sampling device, as shown in Figure 1 The battery sampling device includes an optical communication module 100 and a smoke detection module 200, wherein:

[0109] The optical communication module 100 is configured to generate a first light signal.

[0110] The smoke detection module 200 is configured to receive the first light signal scattered by at least part of the smoke. The first light signal scattered by at least part of the smoke received by the smoke detection module 200 is used to determine a smoke detection result of the battery.

[0111] The battery sampling device provided by the embodiments of the present application is installed in a battery. The optical communication module 100 is configured to generate a first light signal, and the first light signal is transmitted inside the battery. When the battery experiences heat runaway, a large amount of smoke will diffuse inside the battery. When the first light signal is transmitted inside the battery, the smoke will scatter the first light signal. The smoke detection module 200 detects the scattered first light signal by using the scattering of the first light signal by the smoke, and determines the smoke detection result of the battery, i.e., whether there is smoke inside the battery. The heat runaway state of the battery can be analyzed through the smoke detection result.

[0112] The first optical signal generated by the optical communication module 100 can be any signal, which is only used for smoke detection and does not carry other information, and serves as a scattering source for smoke detection. For example, the optical communication module 100 includes a light-emitting diode and a corresponding driving circuit, and the driving circuit drives the light-emitting diode to generate the first optical signal. In the absence of smoke inside the battery, the first optical signal will not be scattered, and the smoke detection module 200 will not detect the scattered first optical signal. When there is smoke inside the battery, smoke particles will scatter the first optical signal, and a part of the scattered first optical signal will be detected by the smoke detection module 200.

[0113] In addition, the battery sampling device provided by the embodiment of the present application is installed inside the battery. In addition to collecting smoke information of the battery, the battery sampling device can also be used to obtain sampling information of the battery, such as voltage, temperature, and current of the module or the cell in the battery. The sampling information is transmitted by the optical communication module 100. At this time, the optical signal carrying the sampling information generated by the optical communication module 100 can be regarded as the first optical signal. After each sampling module in the battery sampling device obtains the corresponding data, the sampling information is transmitted by the optical communication module 100 in the form of optical communication, and the electrical signal is converted into an optical signal, that is, the first optical signal is emitted. At this time, the first optical signal is used as a light source for smoke scattering. In the absence of smoke inside the battery, the first optical signal will not be scattered and will be completely received by the optical communication module 100 of other devices. When there is smoke inside the battery, the smoke will scatter the first optical signal, and a part of the scattered first optical signal will be detected by the smoke detection module 200, and another part will be received by the optical communication module 100 of other devices.

[0114] In actual application scenarios, the optical communication module 100 usually also has the function of transmitting state data. In the various embodiments mentioned below, more attention is paid to the acquisition and transmission of smoke detection information, and therefore the acquisition and transmission of state data will not be described here, but it is understood that there can be in actual application scenarios.

[0115] It should be noted that the first optical signal will be scattered in various directions after being scattered by the smoke. In combination with the position distribution of the smoke detection module 200, the smoke detection module 200 cannot detect the scattered first optical signal, and therefore the smoke detection module 200 can only detect at least part of the scattered first optical signal. At this time, at least part of the scattered first optical signal is detected instead of all the scattered first optical signal to represent the smoke concentration.

[0116] Specifically, the higher the smoke concentration, the more the first light signal scattered, and the more the first light signal scattered by the smoke received by the smoke detection module 200. The smoke detection result of the battery is determined by at least part of the first light signal scattered by the smoke received by the smoke detection module 200. The intensity of the first light signal scattered by the smoke received can be judged by setting a smoke detection threshold to determine whether there is smoke.

[0117] The smoke detection threshold can have multiple, and the corresponding smoke detection result also has multiple. By different smoke detection thresholds, the possible smoke concentration in the battery is divided into multiple levels, and each level corresponds to a smoke detection result. For example, the smoke detection threshold includes a first detection threshold and a second detection threshold, wherein the first detection threshold is less than the second detection threshold, and correspondingly, there are 3 smoke detection results. When the intensity of the received first light signal scattered by the smoke is less than the first detection threshold, the smoke detection result is that there is no smoke; when the intensity of the received first light signal scattered by the smoke is not less than the first detection threshold and not greater than the second detection threshold, the smoke detection result is that there is less smoke; when the intensity of the received first light signal scattered by the smoke is greater than the second detection threshold, the smoke detection result is that there is a large amount of smoke.

[0118] Each of the above smoke detection results has a corresponding thermal runaway degree, and when the battery is detected for thermal runaway, different thermal runaway warnings can be triggered for different thermal runaway degrees.

[0119] After the smoke detection module 200 receives at least part of the first light signal scattered by the smoke, the controller inside the battery sampling device can determine the smoke detection result, and the received at least part of the first light signal scattered by the smoke can also be sent to other devices, such as control devices, to determine the smoke detection result.

[0120] The battery sampling device is usually installed inside the battery. In one of the embodiments, the battery has multiple modules or cells, and each module or cell is provided with a corresponding battery sampling device. The installation position of each module in the battery sampling device is determined in combination with the working principle of the module, the distribution structure of the modules or cells inside the battery, and the communication mode between the battery sampling device and other devices. For example, the battery sampling device can be located inside or on top of the module, and can be directly integrated on the end plate or side plate of the module, close to the busbar or temperature sensor of the cell, and part of the design will fix the sampling circuit board (voltage / temperature sampling board) under the top cover of the module. In the embodiments of the present application, the position of the smoke detection module 200 needs to meet the detection of the surrounding environment of the corresponding module or cell, and the specific position needs to be determined in combination with the actual application scene.

[0121] In the application, when the battery is in thermal runaway, the generated smoke diffuses in the surrounding environment of the module or the cell. The smoke detection module 200 detects the smoke concentration in the internal environment of the battery and receives the first light signal at least partially scattered by the smoke.

[0122] The smoke detection module 200 receives the first light signal at least partially scattered by the smoke by using the influence of smoke particles on light or ionization current. Specifically, the smoke detection module 200 uses a light-sensitive element such as a photodiode or a phototransistor to detect the scattered light by taking the first light signal generated by the optical communication module 100 as a light source. When there is no smoke, the light-sensitive element receives little or no light, and when there is smoke, the smoke particles scatter the first light signal, and part of the scattered light is received by the light-sensitive element. The light-sensitive element converts the received light signal into a current signal or a resistance change to achieve detection. The current size or resistance size represents the intensity of the received at least partially scattered first light signal.

[0123] Taking the example that the smoke detection module 200 includes a photodiode, the photodiode receives at least part of the scattered light and outputs the scattered light after converting it into a current signal. The size of the current represents the strength of the received scattered light, which represents the smoke concentration.

[0124] In the above embodiment, the battery sampling device includes the optical communication module 100 and the smoke detection module 200. The optical communication module 100 is used to generate the first light signal; the smoke detection module 200 is used to receive the first light signal at least partially scattered by the smoke. The first light signal received by the smoke detection module 200 is used to determine the smoke detection result of the battery. By integrating the smoke detection module 200 in the battery sampling device, the smoke is directly detected by combining the scattering effect of smoke on light. This method has fast response speed and high sensitivity to smoke. Moreover, it no longer relies solely on the quality of optical communication, avoiding false detection caused by the influence of environmental light and other non-smoke reasons on the quality of optical communication, thereby improving the accuracy of smoke detection.

[0125] In one of the embodiments, as shown in Figure 2 The battery sampling device further includes:

[0126] The first controller 300 is connected with the smoke detection module 200 and is used to determine the smoke detection result of the battery according to the first light signal at least partially scattered by the smoke received by the smoke detection module 200; or,

[0127] The first controller 300 is used to send the first light signal at least partially scattered by the smoke received by the smoke detection module 200 to determine the smoke detection result of the battery.

[0128] The first controller 300 is connected with the smoke detection module 200 and the optical communication module 100, and is used for obtaining the first light signal scattered by the smoke at least in part received by the smoke detection module 200, determining the smoke detection result according to the signal, or sending the signal through the optical communication module 100 so that other devices determine the smoke detection result according to the signal.

[0129] Inside the battery sampling device, the modules are electrically connected with each other, and the battery sampling device and other devices are optically communicated through the optical communication module 100.

[0130] In one embodiment, the smoke detection module 200 comprises:

[0131] The first photoelectric conversion unit 201 is used for receiving the first light signal scattered by the smoke at least in part and converting the first light signal into a first electric signal;

[0132] The first controller 300 is electrically connected with the first photoelectric conversion unit 201, and the first controller 300 is used for determining the smoke detection result of the battery according to the first electric signal; or

[0133] The first controller 300 is electrically connected with the first photoelectric conversion unit 201, and the first controller 300 is used for determining the smoke detection result of the battery according to the first electric signal; or

[0134] The first photoelectric conversion unit 201 comprises a photosensitive element, which senses the first light signal scattered by the smoke. The first photoelectric conversion unit 201 converts the scattered light into a first electric signal, and the size of the first electric signal represents the intensity of the received scattered light. The first electric signal is received by the first controller 300, the first controller 300 analyzes the first electric signal, extracts information representing the smoke concentration such as the current size, and then determines the smoke detection result based on the current size; or sends the information representing the smoke concentration such as the current size to the optical communication module 100, which sends the information to other devices to determine the smoke detection result.

[0135] The above-mentioned battery sampling device provided by the embodiment can detect the scattered light through the first photoelectric conversion unit 201, convert the scattered light into an electric signal, and thus analyze the smoke. Two schemes can be realized, i.e., determining the smoke detection result inside the battery sampling device and sending the electric signal to determine the smoke detection result by other devices. The former can directly determine the smoke detection result without the cooperation of other devices, and is suitable for the scene of a single battery sampling device; the latter needs to be combined with other devices, and is suitable for the scene of multiple battery sampling devices, and the smoke detection result is determined by the control device after unified analysis.

[0136] In one embodiment, the first photoelectric conversion unit 201 comprises a first light signal receiving device 2011, which is used for receiving the first light signal scattered by the smoke at least in part and converting the first light signal into a second electric signal;

[0137] The first conversion circuit 2012 is connected to the first optical signal receiving device 2011 and is used to convert and / or amplify the second optical signal to obtain the first electrical signal.

[0138] The first optical signal receiving device 2011 is a photosensitive element, such as a photodiode or phototransistor. After sensing the scattered light, the first optical signal receiving device 2011 generates a current signal, also known as photocurrent, which is the second electrical signal. The magnitude of the second electrical signal is directly proportional to the light intensity of the first optical signal scattered by the smoke.

[0139] The second electrical signal output by the first optical signal receiving device 2011 is relatively weak, and the current signal is not conducive to subsequent signal processing, such as amplification, transmission and digitization. Therefore, the second electrical signal is converted into a voltage signal by the first conversion circuit 2012 and amplified to obtain the first electrical signal, which is then sent to the first controller 300.

[0140] In one embodiment, the first conversion circuit 2012 includes a transimpedance amplifier. The cathode of the photodiode is connected to the inverting input of the transimpedance amplifier, and the anode is grounded (or biased); the feedback resistor Rf determines the gain Vout = Ipd × Rf. The first controller 300 has corresponding processing circuitry for processing the first electrical signal, i.e., the voltage signal, input to the first conversion circuit 2012, such as through filtering circuitry, to suppress high-frequency noise.

[0141] In the battery sampling device provided in the above embodiment, the second electrical signal generated by the first optical signal receiving device 2011 is processed by the first conversion circuit 2012 so that the subsequent circuit can process it effectively and reliably, and finally use it to determine whether smoke exists.

[0142] In one embodiment, such as Figure 3 As shown, the smoke detection module 200 also includes:

[0143] The optical detection cavity 202 is used to contain the smoke generated by the battery. The optical detection cavity 202 is provided with a first light-transmitting hole and a second light-transmitting hole. The first light signal can enter the optical detection cavity 202 through the first light-transmitting hole. After the first light signal is scattered by the smoke in the optical detection cavity 202, the remaining second light signal can be emitted through the second light-transmitting hole.

[0144] The first photoelectric conversion unit 201 is disposed inside the optical detection cavity 202.

[0145] The optical detection cavity 202 is installed on the battery and can accommodate the smoke environment, that is, the gas around the module or the battery core. The optical detection cavity 202 adopts a semi-closed structure, which allows air and smoke to slowly enter, but blocks external strong light, dust and other interference. The optical detection cavity 202 belongs to a “limited opening” structure, such as a labyrinth structure or a micro-porous structure to balance the internal and external air pressure, while blocking interference.

[0146] The inner wall of the optical detection cavity 202 can be made of black matte material, such as anodized aluminum or special coating, to reduce false triggering caused by light reflection. In addition, in some special scenarios, the material of the optical detection cavity 202 also needs to be corrosion-resistant to resist chemical substances in the smoke, such as acidic gas generated by thermal runaway of lithium batteries.

[0147] The optical detection cavity 202 is provided with a first light transmission hole and a second light transmission hole. When there is no smoke in the battery, the first light signal generated by the optical communication module 100 can pass through the first light transmission hole and the second light transmission hole in turn and be emitted. The first photoelectric conversion unit 201 is located in the optical detection cavity 202. When there is smoke in the battery, the smoke enters the optical detection cavity 202 and is detected by the first photoelectric conversion unit 201, generating a first electric signal and sending it to the first controller 300.

[0148] It should be noted that the first photoelectric conversion unit 201, the first light transmission hole and the second light transmission hole cannot be on the same straight line. The first photoelectric conversion unit 201, as a receiving end of scattered light, needs to have a certain angle with the emitting end of the optical communication module 100 (the straight line where the first light transmission hole and the second light transmission hole are located) in order to detect scattered light. The angle is less than 180°, such as Figure 3 In an embodiment, the angle is 90°.

[0149] The optical detection cavity 202 is provided with a specific light path to ensure that smoke particles can effectively scatter or absorb the first light signal, so that the first photoelectric conversion unit 201 can detect scattered light as much as possible.

[0150] By concentrating smoke particles in the optical detection cavity 202, the intensity of scattered light is increased, the sensitivity of the smoke detection module 200 is higher, and the presence of smoke can be detected more accurately, thereby improving the safety of the battery pack.

[0151] In one embodiment, the optical communication module 100 includes a first light emitting unit 101; the first light emitting unit 101 includes:

[0152] The first light signal generating device 1011 is used to generate a first light signal;

[0153] The driving circuit 1012 is connected with the first light signal generating device 1011 and is used to drive the first light signal generating device 1011 to generate the first light signal.

[0154] The first light emitting unit 101 comprises a first light signal generating device 1011 for generating a first light signal, which can be a laser diode; and a driving circuit 1012 for driving the first light signal generating device 1011 to generate the first light signal.

[0155] The driving circuit 1012 is connected with the first controller 300, and under the control of the first controller 300, the driving circuit 1012 drives the first light emitting unit 101 to emit the first light signal carrying the sampling information. At this time, the transmission of the sampling information is realized through the optical communication module 100.

[0156] In an embodiment, the first controller 300 is an AFE chip, which is the core of the battery sampling device and is mainly used for receiving all the sampling information and driving the first light emitting unit 101 to send out the sampling information, and then receiving the first electric signal sent by the smoke detection module 200, analyzing and processing the first electric signal, and sending out the smoke detection result or smoke detection information through the optical communication module 100.

[0157] In one of the embodiments, as shown in FIG. 1, the optical communication module 100 further comprises: Figure 4

[0158] A second photoelectric conversion unit 102 for receiving a second light signal and converting the second light signal into a third electric signal, the second light signal being the first light signal remaining after the first light signal is scattered by smoke.

[0159] The battery sampling device further comprises:

[0160] A second controller 400 connected with the second photoelectric conversion unit 102, for sending the second light signal based on the third electric signal to determine the error code rate of the second light signal, and starting the smoke detection module 200 based on the error code rate.

[0161] The first light signal passes through the optical detection cavity 202 and is scattered by smoke, and the remaining second light signal is received by the second photoelectric conversion unit 102. In an ideal state, if there is no smoke in the battery, the first light signal is directly received by the second photoelectric conversion unit 102 after being generated, that is, the first light signal is consistent with the second light signal, including the intensity of the light and the information carried by the light. However, when there is smoke in the battery, the communication quality of the received second light signal will be affected due to the interference of the smoke.

[0162] The light scattered by the smoke is detected by a photosensitive element in the smoke detection module 200. The signal acquisition chain of the photosensitive element is not started when the smoke detection is not needed, and the smoke detection module 200 is started only when it is determined that the smoke detection is needed.

[0163] ​Specifically, the second controller 400 sends the second optical signal, and the control device detects the communication quality of the second optical signal, such as determining the bit error rate of the second optical signal. If the bit error rate is greater than a certain threshold, a trigger instruction is sent to the first controller 300 to start the smoke detection module 200.

[0164] Taking the smoke detection module 200 including a photodiode as an example, after receiving the trigger instruction, the first controller 300 enables the photodiode to detect scattered light. Specifically, the photodiode enabling includes controlling the power supply or bias voltage of the photodiode to turn on the detection channel, which can effectively reduce power consumption and noise.

[0165] Therefore, based on the communication quality of the second optical signal, the smoke in the battery internal environment is preliminarily detected to determine whether the smoke detection module 200 needs to be activated, which can ensure the accuracy of smoke detection while effectively reducing power consumption and noise.

[0166] In one of the embodiments, the second photoelectric conversion unit 102 includes:

[0167] The second optical signal receiving device 1021 is configured to receive the second optical signal and convert it into a fourth electrical signal.

[0168] The second conversion circuit 1022 is connected with the second optical signal receiving device 1021 and configured to convert and / or amplify the fourth optical signal to obtain a third electrical signal.

[0169] In one of the embodiments, the first optical transmitting unit 101 of the optical communication module 100 is configured to transmit the first optical signal to the first signal transmission direction. As shown in FIG. 1, the first optical signal is transmitted from left to right, generated by the first optical transmitting unit 101 on the left and received by the second photoelectric conversion unit 102 on the right. Figure 4 Figure 5 As shown in FIG. 2, the second optical transmitting unit 103 is electrically connected with the second controller 400, and sends the optical signal to the third photoelectric conversion unit 104. The third photoelectric conversion unit 104 is electrically connected with the first controller 300, converts the received optical signal into an electrical signal, and then sends it to the first controller 300 to realize communication in the second signal transmission direction.

[0170] The first signal transmission direction is different from the second signal transmission direction, and the first optical transmitting unit 101 and the second optical transmitting unit 103 construct a bidirectional communication link of the optical communication module 100.

[0171] ​In the case of having the second light emitting unit 103, the smoke detection module 200 is located at the light emitting side of one of the light emitting units. As in the various embodiments described above, the optical detection cavity 202 is located at the light emitting side of the first light emitting unit 101, so that the first light signal emitted by the first light emitting unit 101 passes through the optical detection cavity 202 and is emitted. Before this, the second light emitting unit 103 has the same structure and connection relationship as the first light emitting unit 101, and the signal transmission direction is opposite. The first controller 300 controls the first light emitting unit 101 to generate the first light signal at the same time, and also controls the second light emitting unit 103 to generate the first light signal and transmit in different directions.

[0172] In the above embodiments, the battery sampling device has a bidirectional communication link, which can realize communication in the other signal transmission direction when there is smoke interference in one of the signal transmission directions.

[0173] When the optical communication module includes the first light emitting unit 101 and the second light emitting unit 103, the optical detection cavity 202 is located at the emitting side of one of the first light emitting unit 101 and the second light emitting unit 103, so as to simplify the structure of the battery sampling device and reduce the space ratio of the battery sampling device inside the battery pack.

[0174] In combination with the above embodiments, the embodiments of the present application provide a battery sampling device, as shown in Figure 6 The battery sampling device includes: a first AFE chip 601, a second AFE chip 602, a first laser diode LD1, a first signal driving circuit 603, a first photodiode PD1, a first signal conversion amplification circuit 604, a second laser diode LD1, a second signal driving circuit 605, a second photodiode PD2, a second signal conversion amplification circuit 606, a smoke chamber 607, a third photodiode PD3, and a third signal conversion amplification circuit 608.

[0175] The smoke chamber 607 is an optical detection cavity. The first signal driving circuit 603, the first laser diode LD1, the first photodiode PD1, and the first signal conversion amplification circuit 604 realize signal transmission in the first signal transmission direction. The second signal driving circuit 605, the second laser diode LD2, the second photodiode PD2, and the second signal conversion amplification circuit 606 realize signal transmission in the second signal transmission direction.

[0176] Figure 7 The battery sampling device shown in Figure 6 The principle of the battery sampling device in realizing smoke detection and the relative positions of the devices are shown. Figure 7 The structure shown has two working states, namely normal communication state and smoke detection state. Among them, Figure 7The upper half part is a normal communication state, LD1 generates a first light signal under the drive of the first signal drive circuit 603, and the first light signal directly passes through the smoke chamber 607 and is received by PD1. Figure 7 The lower half part is a smoke detection state, the first light signal emitted by LD1 is scattered after encountering smoke particles in the smoke chamber 607, so that the light cannot directly reach PD1 on the right side, and part of the light is received by PD3 in the smoke chamber 607, so that the detection information is obtained.

[0177] It should be noted that the battery sampling device provided in the above embodiment actually includes left and right parts using optical communication, and includes two AFE chips, and the two AFE chips have respective corresponding battery modules or battery cells for processing sampling information of the corresponding battery modules or battery cells. In an actual application scenario, when the battery has a plurality of modules or battery cells, each module or battery cell has one AFE chip, and therefore, two adjacent battery sampling devices can share one AFE chip. For example, the first AFE chip 601 can be electrically connected with the first signal conversion and amplification circuit and the second signal drive circuit 605 of the previous (i.e., left) battery sampling device, and the second AFE chip 602 can be electrically connected with the first signal drive circuit 603, the second signal conversion and amplification circuit 606, and the third signal conversion and amplification circuit 608 of the next (i.e., right) battery sampling device.

[0178] Therefore, in an embodiment, all electrically connected parts can be regarded as a battery sampling module, which has an actual product, and the above battery sampling device is used for functional description. In the battery sampling module provided in the above embodiment, the photoelectric conversion unit and the light emitting unit can be flexibly arranged at both ends of the battery module or battery cell, which can cover a larger detection range, so that the smoke detection is more comprehensive and effective, and the smoke condition inside the battery can be found in time.

[0179] The battery management system provided in the embodiment of the present application includes at least one battery sampling device, and the battery sampling device is configured to determine a smoke detection result of a battery according to at least part of a first light signal scattered by smoke received by the battery sampling device.

[0180] The control device is sequentially connected with the at least one battery sampling device, and constitutes a ring-shaped optical communication network.

[0181] The battery sampling device is configured to send the at least part of the first light signal scattered by smoke received by the battery sampling device to the control device, and the control device is configured to determine the smoke detection result of the battery according to the at least part of the first light signal scattered by smoke received by the control device; or,

[0182] The battery sampling device is used to determine the smoke detection result of the battery based on the first light signal that is at least partially scattered by the smoke, and to send the smoke detection result to the control device.

[0183] In practical applications, two adjacent battery sampling devices share one AFE chip, forming an electrical connection between the optical communication module 100 and the AFE chip. Optical communication is used between the optical communication modules 100. Within the battery sampling device, the optical communication modules 100 can use either wireless or wired optical communication. If the battery pack includes multiple battery sampling devices, since these devices are located close together within the battery pack and there is less interference, wireless optical communication can be used between them. However, when the battery sampling device communicates with the control device of the battery pack, if the distance between them is large, there will be more interference during wireless optical transmission. In this case, wired optical communication, such as transmission through optical fiber, can be used.

[0184] like Figure 8 As shown, the battery pack contains two battery sampling devices and a control device. The two battery sampling devices have a total of three AFE chips. Through the optical communication module 100, in the first signal transmission direction, the sampling information and / or smoke detection results of AFE chip 1 are sent to AFE chip 2; AFE chip 2 sends the sampling information and / or smoke detection results of AFE chip 1 and AFE chip 2 to AFE chip 3; AFE chip 3 sends the sampling information and / or smoke detection results of AFE chip 1, AFE chip 2, and AFE chip 3 to the control device. In the second signal transmission direction, information travels from AFE chip 3 to AFE chip 2, then to AFE chip 1, and finally to the control device.

[0185] In one embodiment, there are multiple battery sampling devices, and each pair of adjacent battery sampling devices are sequentially connected via a laser beam.

[0186] The first and last of the multiple battery sampling devices are also connected to the control device.

[0187] In the above embodiments, the control device and multiple battery sampling devices are connected in a daisy-chain topology. For example... Figure 9 As shown, each battery sampling device communicates with its adjacent devices, and through a daisy-chain topology, the signals sent by all battery sampling devices are transmitted to the control device. The first and last of the multiple battery sampling devices are connected to the control device through a light guide medium to achieve wired optical communication.

[0188] In one of the embodiments, the battery management system further comprises at least one optical path processing device; each optical path processing device is located between two adjacent battery sampling devices, and is configured to change the direction of the laser beam to form a ring-shaped optical communication network.

[0189] The optical path processing device is configured to adjust the communication optical path between two adjacent battery sampling devices. In one of the embodiments, the optical path processing device comprises an optical path turning prism.

[0190] In combination with the above-mentioned embodiments, the present application further provides a battery control method. The battery pack comprises a plurality of battery sampling devices and a control device. The battery sampling device comprises a smoke detection module 200 and an optical communication module 100. The plurality of battery sampling devices are connected by wireless optical communication. The control device is connected to at least one of the plurality of battery sampling devices. The method comprises the following steps:

[0191] Determining the smoke detection result of the battery according to the intensity of the received first light signal scattered by the smoke.

[0192] In one of the embodiments, the method further comprises the following steps:

[0193] Determining the bit error rate of the second light signal, wherein the bit error rate is used to start the smoke detection module, and the second light signal is the first light signal remaining after being scattered by the smoke.

[0194] In one of the embodiments, the method further comprises the following steps:

[0195] In the case that the bit error rate is greater than or equal to the first threshold value, the smoke detection module is controlled to start;

[0196] In the case that the bit error rate is less than the first threshold value, the smoke detection module is kept from starting.

[0197] In one of the embodiments, the smoke detection result of the battery is determined according to the intensity of the received first light signal scattered by the smoke, comprising the following steps:

[0198] In the case that the intensity of the received first light signal scattered by the smoke is greater than the second threshold value, the smoke detection result of the battery is determined to be the presence of smoke;

[0199] In the case that the intensity of the received first light signal scattered by the smoke is less than or equal to the first threshold value, the smoke detection result of the battery is determined to be the absence of smoke.

[0200] In one of the embodiments, the method further comprises the following steps:

[0201] In the case that the smoke detection result of the battery is determined to be the presence of smoke, triggering a smoke alarm; and / or,

[0202] In a case where it is determined that the smoke detection result of the battery is that there is no smoke, a communication abnormality alarm is triggered.

[0203] In one embodiment, a battery control method is provided, which is applied to a control device, such as a battery management system. Figure 10 As shown in the figure, the method comprises:

[0204] S1001, acquiring a second light signal sent by a battery sampling device;

[0205] S1002, determining whether the communication quality of the second light signal is less than a preset threshold, if yes, executing S1003, and if no, ending;

[0206] S1003, sending a trigger instruction to activate a smoke detection module in all battery sampling devices;

[0207] S1004, acquiring a first light signal at least partially scattered by smoke received, and determining whether there is smoke according to the first light signal at least partially scattered by smoke received, if yes, executing S1005, and if no, executing S1006;

[0208] S1005, triggering a smoke alarm;

[0209] S1006, triggering a communication abnormality alarm.

[0210] It should be understood that, although each step in the flowchart involved in each of the above embodiments is displayed in sequence according to the arrow, these steps are not necessarily executed in sequence according to the arrow. Unless otherwise specified herein, the execution of these steps is not strictly limited in sequence, and these steps can be executed in other sequences. Moreover, at least part of the steps in the flowchart involved in each of the above embodiments can include multiple steps or multiple stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution sequence of these steps or stages is not necessarily sequential, but can be executed in rotation or alternation with at least part of other steps or steps or stages in other steps.

[0211] Figure 11 The structural schematic diagram of the electronic device provided in the present application is shown in the figure. Figure 11 As shown in the figure, the electronic device 110 provided in the present embodiment comprises at least one processor 1101 and a memory 1102. Optionally, the device 110 further comprises a communication component 1103. The processor 1101, the memory 1102 and the communication component 1103 are connected through a bus 1104.

[0212] In the implementation process, the at least one processor 1101 executes the computer-executable instructions stored in the memory 1102, so that the at least one processor 1101 executes the above-mentioned method.

[0213] The specific implementation process of the processor 1101 can refer to the method embodiments described above, which have similar implementation principles and technical effects, and details are not described here.

[0214] In the above embodiments, it should be understood that the processor can be a central processing unit (English: Central Processing Unit, CPU for short), and can also be other general-purpose processors, digital signal processors (English: Digital Signal Processor, DSP for short), application specific integrated circuits (English: Application Specific Integrated Circuit, ASIC for short), etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc. The steps of the method disclosed in the application can be directly embodied as hardware processor execution, or executed by a combination of hardware and software modules in the processor.

[0215] The memory can include a random access memory (RAM), and can also include a non-volatile memory (NVM), such as at least one disk memory.

[0216] The bus can be an industry standard architecture (ISA) bus, a peripheral component (PCI) bus, or an extended industry standard architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For the convenience of representation, the bus in the drawings of the present application does not limit only one bus or one type of bus.

[0217] In one of the embodiments, the electronic device can be a control device in a battery management system.

[0218] The embodiments of the present application provide a battery system, which includes the above-mentioned battery management system and a battery.

[0219] The application provides an electric energy device, which comprises the battery system, the battery management system or the battery sampling device. The electric energy device can be a vehicle such as a car or a ship, a medical device or an experimental device, and is not limited.

[0220] The application further provides a computer program product comprising a computer program which, when executed by a processor, implements the method.

[0221] The application further provides a computer readable storage medium, wherein computer execution instructions are stored in the computer readable storage medium, and when a processor executes the computer execution instructions, the method is implemented.

[0222] The readable storage medium can be realized by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk or optical disk. The readable storage medium can be any available medium that can be accessed by a general-purpose or special-purpose computer.

[0223] An exemplary readable storage medium is coupled to the processor, so that the processor can read information from the readable storage medium and write information to the readable storage medium. Of course, the readable storage medium can also be an integral part of the processor. The processor and the readable storage medium can be located in an application specific integrated circuit (ASIC). Of course, the processor and the readable storage medium can also exist as discrete components in the device.

[0224] The division of units is only a logical functional division, and in actual implementation, there can be another division mode, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0225] The units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, that is, they can be located in one place, or they can be distributed on a plurality of network units. According to actual needs, some or all of the units can be selected to achieve the purpose of the embodiment.

[0226] In addition, each of the functional units in the various embodiments of the present application can be integrated in one processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit.

[0227] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application can be embodied in the form of a software product, and the computer software product is stored in a storage medium, and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods of the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various program code storage media.

[0228] Those skilled in the art can understand that all or part of the steps of the above-mentioned method embodiments can be completed by program instruction related hardware. The aforementioned program can be stored in a computer readable storage medium. The program, when executed, executes steps including the above-mentioned method embodiments; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk, and various program code storage media.

[0229] Finally, it should be noted that: those skilled in the art will easily think of other embodiments of the present application after considering the specification and practicing the disclosed application. The present application is intended to cover any variations, uses, or adaptations of the present application, which follow the general principles of the present application and include common knowledge or conventional technical means in the art which are not disclosed in the present application, and is not limited to the precise structure described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present application is only limited by the appended claims.

Claims

1. A battery sampling device, characterized by, The battery sampling device comprises: An optical communication module (100) for generating a first optical signal; A smoke detection module (200) for receiving the first optical signal scattered at least partially by smoke, wherein the first optical signal scattered at least partially by smoke received by the smoke detection module (200) is used to determine a smoke detection result of the battery.

2. The apparatus of claim 1, wherein, The battery sampling device further comprises: A first controller (300) connected with the smoke detection module (200) and configured to determine the smoke detection result of the battery according to the first optical signal scattered at least partially by smoke received by the smoke detection module (200); or The first controller (300) is configured to send the first optical signal scattered at least partially by smoke received by the smoke detection module (200) to determine the smoke detection result of the battery.

3. The apparatus of claim 2, wherein, The smoke detection module (200) comprises: A first photoelectric conversion unit (201) configured to receive the first optical signal scattered at least partially by smoke and convert it into a first electrical signal; The first controller (300) is electrically connected with the first photoelectric conversion unit (201), and the first controller (300) is configured to determine the smoke detection result of the battery according to the first electrical signal; or The first controller (300) is configured to send the first electrical signal to determine the smoke detection result of the battery.

4. The apparatus of claim 3, wherein, The first photoelectric conversion unit (201) comprises: A first optical signal receiving device (2011) configured to receive the first optical signal scattered at least partially by smoke and convert it into a second electrical signal; A first conversion circuit (2012) connected with the first optical signal receiving device (2011) and configured to convert and / or amplify the second optical signal to obtain the first electrical signal.

5. The apparatus of claim 3, wherein, The smoke detection module (200) further comprises: An optical detection cavity (202) configured to accommodate smoke generated by the battery, wherein the optical detection cavity (202) is provided with a first light transmission hole and a second light transmission hole, the first optical signal can pass through the first light transmission hole to enter the optical detection cavity (202), and the second optical signal remaining after the first optical signal is scattered by smoke in the optical detection cavity (202) can pass through the second light transmission hole to exit; The first photoelectric conversion unit (201) is arranged in the optical detection cavity (202).

6. The apparatus of claim 1, wherein, The optical communication module (100) comprises a first optical emission unit (101), and the first optical emission unit (101) comprises: A first optical signal generating device (1011) configured to generate the first optical signal; A driving circuit (1012) connected with the first optical signal generating device (1011) and configured to drive the first optical signal generating device (1011) to generate the first optical signal.

7. The apparatus of claim 6, wherein, The battery sampling device further comprises: A first controller (300) is connected with the driving circuit (1012) and used for outputting sampling information to drive the driving circuit (1012) to drive the first light signal generating device (1011) to generate the first light signal.

8. The apparatus of claim 6, wherein, The optical communication module (100) further comprises: A second photoelectric conversion unit (102) is used for receiving a second light signal and converting the second light signal into a third electric signal, wherein the second light signal is the first light signal remaining after being scattered by smoke.

9. The apparatus of claim 8, wherein, The battery sampling device further comprises: A second controller (400) is connected with the second photoelectric conversion unit (102) and used for sending the second light signal based on the third electric signal to determine a bit error rate of the second light signal, wherein the bit error rate is used to start the smoke detection module (200).

10. The apparatus of claim 8, wherein, The second photoelectric conversion unit (102) comprises: A second light signal receiving device (1021) is used for receiving the second light signal and converting the second light signal into a fourth electric signal; A second conversion circuit (1022) is connected with the second light signal receiving device (1021) and used for converting and / or amplifying the fourth light signal to obtain the third electric signal.

11. A battery management system, characterized by, The battery management system comprises at least one battery sampling device as claimed in any one of claims 1-10, wherein the battery sampling device is used to determine a smoke detection result of the battery according to the received first light signal scattered by at least part of smoke.

12. The system of claim 11, wherein, The battery management system further comprises: A control device is sequentially connected with at least one battery sampling device to form a ring-shaped optical communication network; The battery sampling device is used to send the received first light signal scattered by at least part of smoke to the control device, and the control device is used to determine a smoke detection result of the battery according to the received first light signal scattered by at least part of smoke; or The battery sampling device is used to determine a smoke detection result of the battery according to the received first light signal scattered by at least part of smoke and send the smoke detection result to the control device.

13. The system of claim 11 or 12, wherein, The battery sampling device has a plurality of battery sampling devices, and the plurality of battery sampling devices are sequentially connected by a laser beam.

14. The system of claim 13, wherein, The battery management system further comprises at least one light path processing device, wherein each light path processing device is located between two adjacent battery sampling devices and used to change a direction of the laser beam to form a ring-shaped optical communication network.

15. The system of claim 14, wherein, The light path processing device comprises a light path turning prism.

16. The system of claim 12, wherein, The control device is connected with at least one battery sampling device through a light guide medium.

17. A battery control method characterized by, The method comprises: Determining a smoke detection result of the battery according to an intensity of the received first light signal scattered by at least part of smoke.

18. The method of claim 17, wherein, The method further comprises: Determining a bit error rate of a second light signal, wherein the bit error rate is used to start the smoke detection module, and the second light signal is the first light signal remaining after being scattered by smoke.

19. The method of claim 18, wherein, The method further comprises: In a case where the bit error rate is greater than or equal to a first threshold value, the smoke detection module is controlled to be started; and / or, In the case that the error rate is less than the first threshold, the smoke detection module is kept from being activated.

20. The method according to any one of claims 17-19, characterized by, The method further comprises: In the case that the intensity of the received first light signal at least partially scattered by the smoke is greater than a second threshold, determining the smoke detection result of the battery as existing smoke; and / or, In the case that the intensity of the received first light signal at least partially scattered by the smoke is less than or equal to the first threshold, determining the smoke detection result of the battery as non-existing smoke.

21. The method of claim 20, wherein, The method further comprises: In the case that the smoke detection result of the battery is determined as existing smoke, triggering a smoke alarm; and / or, In the case that the smoke detection result of the battery is determined as non-existing smoke, triggering a communication abnormality alarm.

22. A battery system characterized by, The battery system comprises the battery management system according to any one of claims 11-16 and the battery.

23. A vehicle characterized by comprising: The vehicle comprises the battery system according to claim 22, or comprises the battery management system according to any one of claims 11-16, or comprises the battery sampling device according to any one of claims 1-10.

24. A computer readable storage medium having stored thereon a computer program, characterized in that, The computer program, when executed by a processor, implements the battery control method according to any one of claims 17-21.

25. A computer program product comprising a computer program, characterised in that, The computer program, when executed by a processor, implements the battery control method according to any one of claims 17-21.

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