Control method and device of battery management system, battery management system, electronic equipment, vehicle and computer program product

Abstract

The invention discloses a control method of a battery management system, a control device of the battery management system, electronic equipment, a vehicle and a computer program product. Relates to the technical field of vehicle control, and the control method comprises the following steps: determining an impedance value corresponding to each battery cell according to voltage information and current information of each battery cell in a battery; and according to the impedance value corresponding to each battery cell, determining the battery cell with risk in the battery. The method can ensure that a user can timely find the temperature abnormity risk of the battery core in the battery.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle control, and more particularly, to a control method for a battery management system, a control device for a battery management system, an electronic device, a vehicle, and a computer program product. Background Art

[0002] An electric vehicle needs to monitor the safety of the vehicle battery through a battery management system. Currently, the battery management system realizes the safety monitoring of the battery by detecting the temperature change amount of the battery cells inside the battery. When the temperature of the battery cells inside the battery is too high, the battery management system sends a warning message to the user. However, this monitoring method has a relatively serious lag and cannot timely detect the abnormal temperature risk of the battery cells inside the battery. Summary of the Invention

[0003] Embodiments of the present application provide a control method for a battery management system, a control device for a battery management system, an electronic device, a vehicle, and a computer program product to help a user timely detect the abnormal temperature risk of the battery cells inside the battery.

[0004] The present application provides a control method for a battery management system, including: determining an impedance value corresponding to each battery cell according to the voltage information and current information of each battery cell in the battery; determining a battery cell with a risk in the battery according to the impedance value corresponding to each battery cell.

[0005] In some embodiments, the determining an impedance value corresponding to each battery cell according to the voltage information and current information of each battery cell in the battery includes: processing the voltage information and current information of each battery cell in the battery through Fourier transform to obtain a voltage frequency domain value corresponding to the voltage information and a current frequency domain value corresponding to the current information; determining the impedance value corresponding to each battery cell according to the voltage frequency domain value and the current frequency domain value.

[0006] In some embodiments, the determining a battery cell with a risk in the battery according to the impedance value corresponding to each battery cell includes: when the impedance value is greater than a preset impedance threshold, determining that the battery cell corresponding to the impedance value has a risk and sending a warning message; when the impedance value is less than or equal to the preset impedance threshold, determining that the battery cell corresponding to the impedance value has no risk.

[0007] In some embodiments, the control method further includes: determining a current and a voltage corresponding to the beam information according to the beam information; determining a battery cell with a risk in the battery according to the current and the voltage corresponding to the beam information.

[0008] In some embodiments, the control method further includes: transmitting the impedance value corresponding to each battery cell through wireless communication according to a monitoring instruction.

[0009] The present application also provides a control device for a battery management system. The control device of the battery management system includes a battery management chip and a battery management controller. The battery management chip is configured to determine an impedance value corresponding to each battery cell according to the voltage information and current information of each battery cell in the battery. The battery management controller is configured to determine a risky battery cell in the battery according to the impedance value corresponding to each battery cell.

[0010] In some embodiments, the battery management chip includes a voltage monitoring module, a current monitoring module, and an electrochemical impedance monitoring module. The voltage monitoring module is configured to process the voltage information of each battery cell in the battery through Fourier transform to obtain a voltage frequency domain value corresponding to the voltage information. The current monitoring module is configured to process the current information of each battery cell in the battery through Fourier transform to obtain a current frequency domain value corresponding to the current information. The electrochemical impedance monitoring module is configured to determine the impedance value corresponding to each battery cell according to the voltage frequency domain value and the current frequency domain value.

[0011] In some embodiments, the battery management controller is configured to: when the impedance value is greater than a preset impedance threshold, determine that the battery cell corresponding to the impedance value is risky and send a warning message; when the impedance value is less than or equal to the preset impedance threshold, determine that the battery cell corresponding to the impedance value is not risky.

[0012] In some embodiments, the battery management chip further includes a smoke monitoring module and a light emitting module. The light emitting module is configured to send beam information. The smoke monitoring module is configured to determine a current and a voltage corresponding to the beam information according to the beam information. The battery management controller is configured to determine a risky battery cell in the battery according to the current and the voltage corresponding to the beam information.

[0013] In some embodiments, the battery management chip further includes a wireless communication module. The wireless communication module is configured to transmit the impedance value corresponding to each battery cell through wireless communication according to a monitoring instruction.

[0014] The present application also provides a battery management system. The battery management system includes a plurality of serially connected battery cells and the control device of the battery management system in any of the above embodiments. The negative electrode of each battery cell is correspondingly connected to the negative electrode of a battery management chip through an electrical connection piece. Each battery cell is correspondingly connected to the same battery management chip through a connecting piece. Adjacent battery cells are connected through the connecting piece. The battery management chip is communicatively connected to the battery management controller.

[0015] The present application also provides an electronic device, which includes a memory and a processor. The memory is configured to store a computer program, and when the processor executes the computer program, the control method described in any of the above embodiments is implemented.

[0016] The present application also provides a vehicle, which includes the control device of the battery management system in any of the above embodiments, or includes the battery management system in any of the above embodiments, or includes the electronic device in any of the above embodiments.

[0017] The present application also provides a computer program product, on which a computer program is stored, and when the program is executed by a processor, the control method described in any of the above embodiments is implemented.

[0018] In the control method of the battery management system, the control device of the battery management system, the electronic device, the vehicle and the computer program product provided by the present application, by monitoring and obtaining the voltage information and current information of each battery cell in the battery, the impedance value corresponding to each battery cell is determined. Since before the battery cell has a risk of thermal runaway, the chemical reaction inside the battery cell will first cause a change in the electrochemical impedance value of the battery cell, and then the battery cell will experience thermal runaway. Therefore, the present application can further determine the battery cells at risk in the battery according to the impedance value of each battery cell, so as to send a warning message to the user in advance before the temperature of the battery cell is too high, avoiding the lag of the existing monitoring method and ensuring that the user can timely discover the abnormal temperature risk of the battery cells inside the battery.

[0019] Additional aspects and advantages of the embodiments of the present application will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the embodiments of the present application. Description of the Drawings

[0020] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description of the embodiments in conjunction with the accompanying drawings, where:

[0021] Figure 1 is a flowchart of the control method of the battery management system according to some embodiments of the present application;

[0022] Figure 2 is a structural diagram of the control device of the battery management system according to some embodiments of the present application;

[0023] Figure 3 is a flowchart of determining the impedance value corresponding to each battery cell according to the voltage information and current information of each battery cell in the battery in the control method of the battery management system according to some embodiments of the present application;

[0024] Figure 4 It is a schematic structural diagram of a battery management system according to some embodiments of the present application;

[0025] Figure 5 It is a schematic structural diagram of a battery management chip according to some embodiments of the present application;

[0026] Figure 6 It is a schematic flowchart of determining a cell at risk in a battery according to the impedance value corresponding to each cell in the control method of a battery management system according to some embodiments of the present application;

[0027] Figure 7 It is a schematic structural diagram of a control device of a battery management system according to some embodiments of the present application;

[0028] Figure 8 It is a schematic structural diagram of a control device of a battery management system according to some embodiments of the present application;

[0029] Figure 9 It is a schematic structural diagram of a battery management system according to some embodiments of the present application;

[0030] Figure 10 It is a schematic structural diagram of a vehicle according to some embodiments of the present application;

[0031] Figure 11 It is a schematic diagram of the connection state between a computer program product and a processor according to some embodiments of the present application.

[0032] Description of main component symbols:

[0033] Vehicle 1000;

[0034] Battery management system 100;

[0035] Control device 10 of the battery management system;

[0036] Battery management chip 11; Voltage monitoring module 111; Current monitoring module 112; Electrochemical impedance monitoring module 113; Smoke monitoring module 114; Light emitting module 115; Wireless communication module 116; Temperature monitoring module 117; Balancing module 118; Photoelectric diode 119; Battery management controller 12;

[0037] Processor 20;

[0038] Computer program product 200; Computer program 202;

[0039] Electronic device 30;

[0040] Cell 40; Electrical connection piece 50; Connector 60. Detailed implementation manners

[0041] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the embodiments of the present application, and should not be construed as a limitation to the embodiments of the present application.

[0042] The battery management system of an electric vehicle is a key component to ensure the safe operation of the vehicle. The battery management system evaluates the working state of the battery by real-time monitoring parameters such as the temperature, voltage, and current of each battery cell inside the battery. In the battery management system, temperature monitoring is a particularly important link because the temperature change of the battery directly reflects the internal chemical reaction state. When the temperature of the battery cell inside the battery rises, it is usually regarded as a signal of potential danger because too high temperature may lead to a decline in battery performance, shortening of battery life, or even serious safety accidents such as thermal runaway or spontaneous combustion. Currently, the battery management system mainly relies on temperature sensors to detect the temperature change of the battery cells. These sensors are distributed at different positions of the battery pack, can collect temperature data in real time, and transmit this data to the control unit of the battery management system for analysis. When it is detected that the temperature of a certain battery cell exceeds the preset safety threshold, the system will immediately trigger an alarm mechanism to send a warning message to the user, reminding the driver to pay attention to the abnormal state of the battery. However, although this monitoring method can help users understand the state of the battery to a certain extent, there is an obvious problem of lag. Temperature change is a relatively slow physical process. When the temperature of the battery cell inside the battery rises significantly, some degree of abnormality may have occurred, such as local overheating, internal short circuit, or other potential faults. This lag makes the battery management system unable to detect the abnormal risk of the battery in the first time, which may lead to the failure to handle the safety problem in time and ultimately cause more serious consequences. How to solve the problem of being unable to detect the abnormal risk of the battery cells inside the battery in time has become a difficult problem that those skilled in the art urgently need to solve. To solve this problem, the present application provides a control method for a battery management system (as shown in Figure 1 ), a control device for a battery management system (as shown in Figure 2 ), an electronic device 30 (as shown in Figure 10 ), a vehicle 100 (as shown in Figure 10 ), and a computer program product 200 (as shown in Figure 11 ).

[0043] Please refer to Figure 1 and Figure 2 , the control method of the battery management system according to the embodiments of the present application includes:

[0044] 03: Determine the impedance value corresponding to each battery cell according to the voltage information and current information of each battery cell in the battery;

[0045] 05: Determine the cells with risks in the battery according to the impedance value corresponding to each cell.

[0046] The control method of the above battery management system can be applied to the control device 10 of the battery management system. The control device 10 of the battery management system in the embodiment of the present application includes a battery management chip 11 and a battery management controller 12. The battery management chip 11 is used to determine the impedance value corresponding to each cell according to the voltage information and current information of each cell in the battery. The battery management controller 12 is used to determine the cells with risks in the battery according to the impedance value corresponding to each cell.

[0047] Specifically, the control device 10 of the battery management system is a device used to monitor, manage and protect the safe operation of the battery pack inside an electric vehicle. The control device 10 of the battery management system is the core hardware module of the battery management system, including a battery management chip 11 and a battery management controller 12. The control device 10 of the battery management system is responsible for collecting battery parameters in real time, analyzing the state of the cells, and implementing protection strategies. The control device 10 of the battery management system can obtain parameters such as voltage, current, and temperature through sensors and chips. And calculate the internal resistance (electrochemical impedance) of the cells according to the changes in voltage and current. The control device 10 of the battery management system can also analyze the impedance data through the controller, identify abnormal cells, and trigger protection actions such as balancing, power reduction, and disconnection. The battery management chip 11 is responsible for bottom-layer data acquisition, and the battery management controller 12 is responsible for upper-layer logic analysis.

[0048] More specifically, the battery management chip 11 is used to execute step 03. The battery management chip 11 is a special integrated circuit inside the control device 10 of the battery management system. The battery management chip 11 is connected to the battery cells to collect voltage and current data in real time and calculate the equivalent internal resistance (electrochemical impedance) of the cells. The battery management controller 12 is the main control unit of the control device 10 of the battery management system. The battery management controller 12 is used to receive the impedance data of the battery management chip and analyze the state of the cells, so as to judge whether there are risky cells in the battery.

[0049] Furthermore, the battery management system is a software and hardware system responsible for monitoring, managing and protecting the safe operation of the battery pack in the vehicle. The battery refers to the vehicle power battery pack, and the battery is composed of multiple cells connected in series or in parallel. The voltage information of the cells refers to the real-time voltage value of each single battery (cell). The current information refers to the total current flowing through the battery pack or the charge and discharge current of a single cell. The impedance value refers to the equivalent internal resistance (electrochemical impedance value) of the cell, which reflects the state of internal material aging, electrolyte loss or poor contact in the cell. After obtaining the voltage information and current information, the battery management chip 11 can calculate the impedance value of each cell in the battery through Ohm's law.

[0050] It can be understood that for the control method of the battery management system provided in this application, by monitoring and obtaining the voltage information and current information of each battery cell in the battery, the impedance value corresponding to each battery cell is determined. Since before the risk of thermal runaway of the battery cell, the chemical reaction inside the battery cell will first cause a change in the electrochemical impedance value of the battery cell, and then the battery cell will experience thermal runaway. Therefore, this application can further determine the battery cells at risk in the battery according to the impedance value of each battery cell, so as to send a warning message to the user in advance before the temperature of the battery cell is too high, avoiding the lag of the existing monitoring method and ensuring that the user can timely discover the abnormal temperature risk of the battery cells inside the battery.

[0051] In some embodiments, please refer to Figure 3 、 Figure 4 and Figure 5 , 03: Determine the impedance value corresponding to each battery cell according to the voltage information and current information of each battery cell in the battery, including:

[0052] 031: Process the voltage information and current information of each battery cell in the battery through Fourier transform to obtain the voltage frequency domain value corresponding to the voltage information and the current frequency domain value corresponding to the current information;

[0053] 033: Determine the impedance value corresponding to each battery cell according to the voltage frequency domain value and the current frequency domain value.

[0054] The above control method of the battery management system can be applied to the control device 10 of the battery management system. The battery management chip 11 includes a voltage monitoring module 111, a current monitoring module 112, and an electrochemical impedance monitoring module 113. The voltage monitoring module 111 is used to process the voltage information of each battery cell in the battery through Fourier transform to obtain the voltage frequency domain value corresponding to the voltage information. The current monitoring module 112 is used to process the current information of each battery cell in the battery through Fourier transform to obtain the current frequency domain value corresponding to the current information. The electrochemical impedance monitoring module 113 is used to determine the impedance value corresponding to each battery cell according to the voltage frequency domain value and the current frequency domain value.

[0055] Specifically, the battery management chip 11 includes a voltage monitoring module 111, a current monitoring module 112, and an electrochemical impedance monitoring module 113. Among them, the voltage monitoring module 111 is used to collect the voltage information of each battery cell in real time and convert it into a voltage frequency-domain value through Fourier transform. The voltage monitoring module 111 can identify abnormal signals in the voltage, such as high-frequency noise, through frequency-domain analysis, so as to detect battery cell problems at an early stage. The current monitoring module 112 is used to collect the current information of each battery cell in real time and convert it into a current frequency-domain value through Fourier transform. The current monitoring module 112 can identify abnormal signals in the current, such as overcurrent or short circuit, through frequency-domain analysis, so as to detect battery cell problems at an early stage. The electrochemical impedance monitoring module 113 can calculate the impedance value of each battery cell according to the voltage frequency-domain value and the current frequency-domain value through Ohm's law, so as to evaluate the health status of the battery cell, identify aging, internal short circuit or other faults, and provide data support for the battery management system.

[0056] Furthermore, the voltage monitoring module 111 is a functional module in the battery management chip 11, which is used to monitor the voltage information of each battery cell in the battery in real time and convert it into a voltage frequency-domain value through Fourier transform. The voltage monitoring module 111 continuously collects the voltage data of each battery cell, uses Fourier transform to convert the time-domain voltage signal into a frequency-domain signal, and analyzes the frequency components in the voltage. The voltage monitoring module 111 can identify high-frequency noise or other abnormal signals in the voltage, helping to detect potential battery cell problems, such as poor contact or internal short circuit. The current monitoring module 112 is a functional module in the battery management chip 11, which is used to monitor the current information of each battery cell in the battery in real time and convert it into a current frequency-domain value through Fourier transform. The current monitoring module 112 continuously collects the current data of each battery cell, uses Fourier transform to convert the time-domain current signal into a frequency-domain signal, and analyzes the frequency components in the current. The current monitoring module 112 can identify high-frequency noise, overcurrent or short circuit conditions in the current, helping to detect potential battery cell problems, such as overcharging or over-discharging. The electrochemical impedance monitoring module 113 is a functional module in the battery management chip 11, which is used to calculate the impedance value of each battery cell according to the voltage frequency-domain value and the current frequency-domain value. The electrochemical impedance monitoring module 113 calculates the impedance value of the battery cell, including resistance and reactance, by comparing the voltage and current frequency-domain values according to Ohm's law. The electrochemical impedance value reflects the health status of the battery cell. The electrochemical impedance monitoring module 113 evaluates the health status of the battery cell through the calculation of the electrochemical impedance value, identifies aging, internal short circuit or other faults, and provides impedance data for other modules of the battery management system to support a more comprehensive battery state analysis.

[0057] It can be understood that the voltage monitoring module 111, the current monitoring module 112, and the electrochemical impedance monitoring module 113 are key functional modules in the battery management chip 11. The voltage monitoring module 111, the current monitoring module 112, and the electrochemical impedance monitoring module 113 work together to monitor and analyze voltage, current, and impedance information in real time, ensuring the safe and stable operation of the battery system. The voltage monitoring module 111, the current monitoring module 112, and the electrochemical impedance monitoring module 113 perform frequency-domain analysis through Fourier transform. These modules can detect abnormal conditions of the battery cells at an early stage, providing reliable data support for the battery management system, thereby improving the service life and safety of the battery.

[0058] Please refer to Figure 2 and Figure 6 , in some embodiments, 05: Determine the battery cells at risk in the battery according to the impedance value corresponding to each battery cell, including:

[0059] 051: When the impedance value is greater than the preset impedance threshold, determine that the battery cell corresponding to the impedance value is at risk and send a warning message;

[0060] 053: When the impedance value is less than or equal to the preset impedance threshold, determine that the battery cell corresponding to the impedance value is not at risk.

[0061] The above control method of the battery management system can be applied to the control device 10 of the battery management system. The battery management controller 12 is used to: when the impedance value is greater than the preset impedance threshold, determine that the battery cell corresponding to the impedance value is at risk and send a warning message; when the impedance value is less than or equal to the preset impedance threshold, determine that the battery cell corresponding to the impedance value is not at risk.

[0062] Specifically, in the battery management system, the electrochemical impedance value of the battery cell is the core parameter for evaluating the health status of the battery cell. The impedance (internal resistance) of the battery cell will gradually increase with factors such as the usage time, the number of charge and discharge cycles, and the temperature change. When problems such as aging, internal short circuit, electrolyte dryness, or poor contact occur in the battery cell, its impedance value will increase significantly. Therefore, by setting an impedance threshold (a preset safety critical value that can be set by relevant personnel) in the battery management controller 12, it is possible to quantitatively determine whether the battery cell is in an abnormal state.

[0063] More specifically, the impedance threshold can be obtained by accelerating the aging experiment and statistically analyzing the impedance value distribution of the battery cells at different life stages. The warning message can avoid risks such as thermal runaway of the battery cells (excessive impedance leads to a sharp increase in heat generation during charge and discharge, interfering with the normal operation of other battery cells), capacity attenuation (high internal resistance battery cells cannot effectively store or release energy), and imbalance of the battery pack (abnormal temperature of a single battery cell will interfere with the normal operation of other battery cells, thereby accelerating the overall performance degradation).

[0064] Further, when the impedance value is greater than a preset impedance threshold, the battery management controller 12 determines that the battery cell corresponding to the impedance value is at risk and sends a warning message. The warning message can be sent to the user through a vehicle-mounted screen, a pop-up window of a mobile phone APP, etc., so as to remind the user that the battery has an abnormal risk. In addition, when the battery management controller 12 monitors that the impedance value is greater than the preset impedance threshold, it can also limit the charge and discharge current of the battery cell with abnormal impedance (for example, reduce the charge and discharge current of the corresponding battery cell) to prevent further deterioration. The load of the high-risk battery cell can also be further reduced through the balancing module 118 inside the battery management chip 11 (when the battery cells of the battery are normal, the balancing module 118 is used to balance the voltages of the battery cells inside the battery. For example, if there is a battery cell with a voltage higher than that of other battery cells inside the battery, the balancing module 118 will control the battery cell with too high voltage to discharge more, increase the load borne by the battery cell, so as to accelerate the discharge speed of the battery cell with too high voltage, so as to ensure that the voltages of all the battery cells inside the battery are maintained at the same level).

[0065] It can be understood that the battery management controller 12 realizes accurate judgment and hierarchical response to the risks of the battery cells through real-time comparison of the impedance value with the preset threshold. The essence of this method is to convert the chemical state (such as aging, failure) inside the battery cell into a quantifiable electrical parameter (impedance), so as to give an early warning and intervene in the processing before the potential safety hazard causes a significant temperature rise or other visible abnormalities, significantly improving the safety and reliability of the battery system.

[0066] In some embodiments, please refer to Figure 4 、 Figure 5 and Figure 7 , the control method further includes:

[0067] 07: Determine the current and voltage corresponding to the beam information according to the beam information;

[0068] 08: Determine the battery cells at risk in the battery according to the current and voltage corresponding to the beam information.

[0069] The control method of the above battery management system can be applied to the control device 10 of the battery management system. The battery management chip further includes a smoke monitoring module 114 and a light emitting module 115. The light emitting module 115 is used to send beam information. The smoke monitoring module 114 is used to determine the current and voltage corresponding to the beam information according to the beam information. The battery management controller 12 is used to determine the battery cells at risk in the battery according to the current and voltage corresponding to the beam information.

[0070] Specifically, the beam information refers to the optical signals inside the battery obtained by an optical sensor. The beam information reflects the chemical reaction state inside the battery, the concentration change of the electrolyte, the redox process of the electrodes, etc. There is an indirect relationship between the beam information and the current and voltage of the battery. By analyzing the change of the optical signal, the chemical reaction state inside the battery can be inferred, and then the current and voltage values can be calculated.

[0071] More specifically, the light-emitting module 115 can be an LED lamp. The light-emitting module 115 is integrated in the battery management chip and is used to emit a beam of a specific wavelength (such as infrared light) into the battery or a specific area. The smoke monitoring module 114 can receive and analyze the beam information emitted by the light-emitting module 115. The smoke monitoring module 114 can judge whether there is smoke through the change of the beam intensity, scattering or absorption, and convert it into an electrical signal (current, voltage). When a thermal runaway occurs in a certain cell in the battery pack and smoke is generated, the particles in the smoke will refract, transmit or reflect the beam generated by the light-emitting module 115. There is also a photodiode 119 arranged on the battery management chip 11. The smoke detection module 114 detects the beam through the photodiode 119. In the case of smoke occlusion, the smoke detection module 114 receives a changed optical signal through the photodiode 119 and converts the optical signal into a corresponding electrical signal.

[0072] Further, after the smoke detection module 114 converts the optical signal into a corresponding electrical signal (such as current and voltage), if the change amplitude of the electrical signal is too large, it is determined that there is a risk of abnormal temperature in the cell. For example, if the smoke detection module 114 detects through the photodiode 119 that the change amount of the current is greater than the preset current change amount threshold (which can be set by relevant personnel), then the smoke detection module 114 will determine that there is a risk of abnormal temperature in the cell. Or, if the smoke detection module 114 detects through the photodiode 119 that the change amount of the voltage is greater than the preset voltage change amount threshold (which can be set by relevant personnel), then the smoke detection module 114 will determine that there is a risk of abnormal temperature in the cell.

[0073] Further, in this application, by integrating the light-emitting module 115 and the smoke monitoring module 114 in the battery management chip 11, real-time and high-precision detection of the smoke generated when the temperature of the cell is abnormal is achieved, and the change of the beam is monitored through the photodiode 119, and then the optical signal is converted into an electrical signal for analysis by the battery management controller 12.

[0074] Please refer to Figure 4 、 Figure 5 and Figure 8 , in some embodiments, the control method further includes:

[0075] 04: According to the monitoring instruction, transmit the impedance value corresponding to each cell through wireless communication.

[0076] The control method of the above battery management system can be applied to the control device 10 of the battery management system. The wireless communication module 116 is further included. The wireless communication module 116 is used to transmit the impedance value corresponding to each battery cell through wireless communication according to the monitoring instruction.

[0077] Specifically, the wireless communication module 116 can be a Bluetooth module, a WiFi module, etc. By setting the wireless communication module 116, the present application no longer needs to set a large number of wire harnesses in the battery management system to transmit information and data, thereby simplifying the structure of the entire battery management system and reducing the production cost.

[0078] In summary, for the control method of the battery management system provided by the present application, by monitoring and obtaining the voltage information and current information of each battery cell in the battery, the impedance value corresponding to each battery cell is determined. Since before the risk of thermal runaway of the battery cell, the chemical reaction inside the battery cell will first cause the electrochemical impedance value of the battery cell to change, and then the situation of thermal runaway of the battery cell occurs. Therefore, the present application can further determine the battery cells with risks in the battery according to the impedance value of each battery cell, thereby sending a warning message to the user in advance before the temperature of the battery cell is too high, avoiding the lag of the existing monitoring method, and ensuring that the user can timely discover the abnormal temperature risk of the battery cells inside the battery.

[0079] In some embodiments, please refer to Figure 4 and Figure 9 , the present application further provides a battery management system 100. The battery management system 100 includes a plurality of serially connected battery cells 40 and the control device 10 of the battery management system in any one of the above embodiments. The negative electrode of each battery cell 40 is correspondingly connected to the negative electrode of a battery management chip 11 through an electrical connection piece 50. Each battery cell 40 is correspondingly connected to the same battery management chip 11 through a connecting piece 60. Adjacent battery cells 40 are connected through a connecting piece 60. The battery management chip 11 is communicatively connected to the battery management controller 12.

[0080] It can be understood that in the traditional battery management system, a daisy-chain communication architecture is usually adopted between the battery cells and the battery management chip, which results in that each battery cell needs to be connected to the chip through an independent wire harness, and modular assembly depends on connectors, resulting in a large number of wire harnesses and high costs. There is a high voltage difference between the series-connected battery cells, and additional isolation devices (such as optocouplers, capacitor isolators) need to be added to ensure communication safety, further increasing the material cost. In the daisy-chain communication architecture, long-term vibration or temperature change is likely to cause wear or breakage of the wire harness, and poor contact may also cause communication interruption or data error.

[0081] Further, in the present application, the negative electrode of each battery cell 40 is directly fixed to the negative electrode interface of the battery management chip 11 through an electrical connection piece 50, without the need for additional wiring harnesses. Adjacent battery cells 40 are connected in series through a rigid connection piece 60, while transmitting both power and communication signals. The battery management chip 11 and the battery management controller 12 are connected through a single bus or wireless communication (such as CAN, Bluetooth), replacing the multi-stage series communication link of the traditional daisy chain.

[0082] Further, in the present application, the electrical connection piece 50 and the rigid connection piece 60 can replace the traditional wiring harness, reducing the procurement costs of cables and connectors. The high voltage difference is directly handled through the insulation design of the physical connection piece 60 (such as ceramic substrate, copper clad laminate), without the need for additional isolation devices. The battery cell 40 and the battery management chip 11 are pre-assembled into an independent module through the rigid connection piece 60. During installation, only the modules need to be assembled, without complex wiring. When a single battery cell 40 or the battery management chip 11 fails, the corresponding module can be directly disassembled, avoiding the maintenance problem of "affecting the whole by pulling one part" in the traditional daisy chain. The anti-vibration and anti-impact capabilities of the rigid connection piece 60 are far superior to those of the flexible wiring harness, and can reduce the poor contact caused by physical deformation. The lifespan of the metal electrical connection piece 50 is longer than that of the traditional wiring harness, and can avoid the open circuit risk caused by the aging of the wiring harness. The electrical connection piece 50 and the rigid connection piece 60 have both power transmission and mechanical fixing functions, and can reduce redundant components. After the communication link is simplified, the internal space utilization rate of the battery pack is improved, and the overall weight of the battery pack is reduced.

[0083] In some embodiments, referring to Figure 10 , the present application further provides an electronic device 30. The electronic device 30 includes a memory and a processor. The memory is configured to store a computer program. When the processor executes the computer program, the control method in any one of the above embodiments is implemented.

[0084] For example, when the processor of the electronic device 30 executes the computer program stored in the memory, the following control method is implemented:

[0085] 03: Determine the impedance value corresponding to each battery cell according to the voltage information and current information of each battery cell in the battery;

[0086] 05: Determine the battery cells at risk in the battery according to the impedance value corresponding to each battery cell.

[0087] For another example, when the processor of the electronic device 30 executes the computer program stored in the memory, the following control method is implemented:

[0088] 031: Process the voltage information and current information of each battery cell in the battery through Fourier transform to obtain the voltage frequency domain value corresponding to the voltage information and the current frequency domain value corresponding to the current information;

[0089] 033: Determine the impedance value corresponding to each battery cell according to the voltage frequency domain value and the current frequency domain value.

[0090] For another example, when the processor of the electronic device 30 executes the computer program stored in the memory, it can also implement the control methods in 04, 051, 053, 07, and 08.

[0091] In some embodiments, refer to Figure 10 , the present application further provides a vehicle 100, including the control device 10 of the battery management system in any of the above embodiments, or including the battery management system 100 in any of the above embodiments, or including the electronic device 30 in any of the above embodiments.

[0092] Please refer to Figure 11 , in some embodiments, the present application further provides a computer program product 200, on which a computer program 202 is stored, and when the program is executed by a processor, it implements the control method in any of the above embodiments.

[0093] For example, when the computer program 202 is executed by the processor 20, the following control method is implemented:

[0094] 03: Determine the impedance value corresponding to each battery cell according to the voltage information and current information of each battery cell in the battery;

[0095] 05: Determine the battery cells at risk in the battery according to the impedance value corresponding to each battery cell.

[0096] For another example, when the computer program 202 is executed by the processor 20, the following control method is implemented:

[0097] 031: Process the voltage information and current information of each battery cell in the battery through Fourier transform to obtain the voltage frequency domain value corresponding to the voltage information and the current frequency domain value corresponding to the current information;

[0098] 033: Determine the impedance value corresponding to each battery cell according to the voltage frequency domain value and the current frequency domain value.

[0099] For another example, when the computer program 202 is executed by the processor 20, it can also implement the control methods in 04, 051, 053, 07, and 08.

[0100] In the computer program product 200 of the present application, by monitoring and obtaining the voltage information and current information of each battery cell in the battery, the impedance value corresponding to each battery cell is determined. Since before the risk of thermal runaway of the battery cell, the chemical reaction inside the battery cell will first cause a change in the electrochemical impedance value of the battery cell, and then cause the battery cell to experience thermal runaway. Therefore, the present application can further determine the battery cells at risk in the battery according to the impedance value of each battery cell, so as to send a warning message to the user in advance before the temperature of the battery cell is too high, avoiding the lag of the existing monitoring method and ensuring that the user can timely discover the risk of abnormal temperature of the battery cells inside the battery.

[0101] In the description of this specification, the descriptions referring to terms such as "certain embodiments", "in an example", "exemplarily", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0102] Any process or method description shown in the flowchart or described in other ways herein can be understood as representing a module, segment or part of code including one or more executable instructions for implementing a specific logical function or process. The scope of the preferred embodiments of the present application includes additional implementations, where the functions can be executed in a substantially simultaneous manner or in the reverse order according to the functions involved, rather than in the order shown or discussed, which should be understood by those skilled in the art to which the embodiments of the present application belong.

[0103] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present application.

Claims

1. A control method for a battery management system, characterized in that Including: Determine the impedance value corresponding to each battery cell according to the voltage information and current information of each battery cell in the battery; Determine the battery cells at risk in the battery according to the impedance values corresponding to each battery cell.

2. The control method according to claim 1, characterized in that The determining the impedance value corresponding to each battery cell according to the voltage information and current information of each battery cell in the battery includes: Process the voltage information and current information of each battery cell in the battery through Fourier transform to obtain the voltage frequency domain value corresponding to the voltage information and the current frequency domain value corresponding to the current information; Determine the impedance value corresponding to each battery cell according to the voltage frequency domain value and the current frequency domain value.

3. The control method according to claim 1, characterized in that The determining the battery cells at risk in the battery according to the impedance values corresponding to each battery cell includes: When the impedance value is greater than a preset impedance threshold, determine that the battery cell corresponding to the impedance value is at risk and send a warning message; When the impedance value is less than or equal to the preset impedance threshold, determine that the battery cell corresponding to the impedance value is not at risk.

4. The control method according to claim 1, wherein The control method further includes: Determine the current and voltage corresponding to the beam information according to the beam information; Determine the battery cells at risk in the battery according to the current and voltage corresponding to the beam information.

5. The control method according to claim 1, wherein The control method further includes: Transmit the impedance value corresponding to each battery cell through wireless communication according to the monitoring instruction.

6. A control device for a battery management system, characterized in that, The control device of the battery management system includes a battery management chip and a battery management controller; The battery management chip is used to determine the impedance value corresponding to each battery cell according to the voltage information and current information of each battery cell in the battery; The battery management controller is used to determine the battery cells at risk in the battery according to the impedance values corresponding to each battery cell.

7. The control device according to claim 6, characterized in that, The battery management chip includes a voltage monitoring module, a current monitoring module, and an electrochemical impedance monitoring module; The voltage monitoring module is used to process the voltage information of each battery cell in the battery through Fourier transform to obtain the voltage frequency domain value corresponding to the voltage information; The current monitoring module is used to process the current information of each battery cell in the battery through Fourier transform to obtain the current frequency domain value corresponding to the current information; The electrochemical impedance monitoring module is used to determine the impedance value corresponding to each battery cell according to the voltage frequency domain value and the current frequency domain value.

8. The control device according to claim 6, characterized in that, The battery management controller is used for: When the impedance value is greater than a preset impedance threshold, determine that the battery cell corresponding to the impedance value is at risk and send a warning message; When the impedance value is less than or equal to the preset impedance threshold, determine that the battery cell corresponding to the impedance value is not at risk.

9. The control device according to claim 6, characterized in that, The battery management chip further includes a smoke monitoring module and a light emitting module; The light emitting module is used to send beam information; The smoke monitoring module is used to determine the current and voltage corresponding to the beam information according to the beam information; The battery management controller is used to determine the battery cells at risk in the battery according to the current and voltage corresponding to the beam information.

10. The control device according to claim 6, wherein The battery management chip further includes a wireless communication module; The wireless communication module is used to transmit the impedance value corresponding to each battery cell through wireless communication according to the monitoring instruction.

11. A battery management system, characterized in that, The battery management system includes a plurality of series-connected battery cells and a control device of the battery management system according to any one of claims 6-10; The negative electrode of each battery cell is correspondingly connected to the negative electrode of a battery management chip through an electrical connection piece, each battery cell is correspondingly connected to the same battery management chip through a connecting piece, adjacent battery cells are connected through the connecting piece, and the battery management chip is communicatively connected to a battery management controller.

12. An electronic device, characterized in that, The electronic device includes a memory and a processor, the memory is configured to store a computer program, and when the processor executes the computer program, the control method according to any one of claims 1-5 is implemented.

13. A vehicle, characterized in that, It includes the control device of the battery management system according to any one of claims 6-10, or includes the battery management system according to claim 11, or includes the electronic device according to claim 12.

14. A computer program product having a computer program stored thereon, characterized in that, When the program is executed by the processor, the control method according to any one of claims 1-5 is implemented.

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