Battery monomer management system, new energy vehicle, method, upper computer and storage medium

Abstract

The invention relates to the technical field of batteries, in particular to a single battery management system, a new energy vehicle, a method, an upper computer and a storage medium, and the system comprises a battery module which comprises a plurality of single batteries; the control element is connected with each battery monomer and is used for controlling the current direction of the battery monomer; the control panel is connected with the control element connected with each battery monomer and is used for controlling the control element according to the battery control instruction and monitoring electric power parameters of each battery monomer; the optical fiber temperature sensor is connected with each battery monomer and is used for monitoring the state parameter of each battery monomer; and the upper computer is respectively connected with the control panel and the optical fiber temperature sensor and is used for issuing a battery control instruction to the control panel and managing each single battery according to the electric power parameters transmitted by the control panel and / or the state parameters transmitted by the optical fiber temperature sensor. Therefore, the problem that the working state of the single battery cannot be accurately obtained in the prior art is solved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell management system, a new energy vehicle, a method, a host computer and a storage medium. Background Art

[0002] At present, it is difficult to monitor the status of battery systems, the safety warning capabilities are insufficient, and fires and explosions under extreme conditions seriously affect the development of new energy vehicles. The development of smart lithium-ion batteries helps to disperse complex battery management functions to the single cell level and eliminate the "short board effect" that restricts the performance of battery systems. In the development of smart batteries, the development and application of battery multi-source parameter sensors is the focus of smart battery research.

[0003] At present, the battery management system cannot meet the requirements of detailed battery monitoring. The rough battery monitoring method is likely to cause the performance of several batteries to degrade, thus affecting the "short board effect" of the overall system performance. Since it is difficult to accurately know the working status of each battery at the system or module level, working status monitoring at the single battery level has become a research focus.

[0004] In terms of current monitoring, the use of unknown quantity observers can achieve estimation of single-cell current. In terms of voltage monitoring, with the advancement of chip technology, miniaturized voltage acquisition chips and voltmeter probes can be integrated into battery cells to achieve single-cell voltage monitoring. In terms of temperature monitoring, FBG (Fiber Bragg Grating) or RTD (Resistance Temperature Detector) manufactured using MEMS technology has been embedded in the battery. However, the signals that lithium-ion batteries show in use are far more than just voltage, current, and temperature. The expansion force, expansion displacement, and structural evolution of the battery are also very important. In addition, the use of magnetic resonance technology and computer tomography technology can also achieve monitoring of battery structural evolution. However, at the module level, single-cell batteries are constrained to be assembled, and their expansion characteristics or temperature characteristics will be difficult to measure freely at the single-cell level. Therefore, the above-mentioned method of monitoring the working status of battery cells is still difficult to promote to the module. Summary of the invention

[0005] The present application provides a battery cell management system, a new energy vehicle, a method, a host computer and a storage medium to solve the problem that the working status of the battery cell cannot be accurately obtained in the related art.

[0006] The first aspect of the present application provides a battery cell management system, comprising the following steps: a battery module, the battery module comprising a plurality of battery cells; a control element connected to each battery cell, for controlling the current direction of the battery cell; a control board connected to the control element connected to each battery cell, for controlling the control element according to a battery control instruction, and monitoring the power parameters of each battery cell; an optical fiber temperature sensor connected to each battery cell, for monitoring the state parameters of each battery cell, wherein the state parameters include temperature and strain; a host computer respectively connected to the control board and the optical fiber temperature sensor, for sending battery control instructions to the control board, and managing each battery cell according to the power parameters transmitted by the control board and / or the state parameters transmitted by the optical fiber temperature sensor.

[0007] Optionally, the control board includes: a main control chip, a voltage monitoring module and a current monitoring module, wherein the main control chip is used to control the control elements according to the battery control instructions; the voltage monitoring module is used to monitor the voltage of each battery cell and the total voltage of the battery module; the current monitoring module is used to monitor the current of each battery cell and the current of each battery cell series branch.

[0008] Optionally, the control element includes first to fourth control elements, and the control board is further used for: if the battery control instruction is to charge the battery cell, controlling the first control element of the corresponding battery cell to be turned on, and the second to fourth control elements to be turned off; if the battery control instruction is to discharge the battery cell, controlling the second control element of the corresponding battery cell to be turned on, and the first control element, the third control element, and the fourth control element to be turned off.

[0009] Optionally, the host computer is further used to: if there is an abnormality in at least one of the voltage, temperature and strain of the battery cell, send an isolation control instruction to the control board, wherein the control board controls the first control element and the second control element of the corresponding battery cell to be cut off according to the isolation control instruction, and the third control element and the fourth control element are turned on according to the current direction.

[0010] Optionally, the host computer is further used to: calculate the current capacity and health status of the battery cell based on the charging capacity and discharging capacity corresponding to each battery cell; calculate the total current based on the current of each battery cell series branch; calculate the battery power status of the battery cell based on the total current and the total voltage of the battery module.

[0011] A second aspect of the present application provides a new energy vehicle, including a battery cell management system according to the above embodiment.

[0012] The third aspect of the present application provides a battery cell management method, which is managed using a battery cell management system such as the above embodiment, including the following steps: sending battery control instructions to a control board, wherein the control board controls the control elements of each battery cell according to the battery control instructions and monitors the power parameters of each battery cell; obtaining the power parameters transmitted by the control board and the status parameters transmitted by the optical fiber temperature sensor; and managing each battery cell based on the power parameters and / or status parameters.

[0013] Optionally, the power parameters include current and voltage, and the state parameters include temperature and strain, and each battery cell is managed based on the power parameters and / or state parameters, including: calculating the current capacity and health status of the battery cell based on the charging capacity and discharging capacity corresponding to each battery cell; calculating the total current based on the current of each series branch of the battery cell; and calculating the battery power state of the battery cell based on the total current and the total voltage of the battery module.

[0014] Optionally, each battery cell is managed based on power parameters and / or state parameters, including: if there is an abnormality in at least one of the voltage, temperature and strain of the battery cell, an isolation control instruction is sent to the control board, wherein the control board controls the first control element and the second control element of the corresponding battery cell to be cut off according to the isolation control instruction, and the third control element and the fourth control element are turned on according to the current direction.

[0015] The fourth aspect of the present application provides a host computer: a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor executes the program to perform the battery cell management method as described in the above embodiment.

[0016] The fifth aspect of the present application provides a computer-readable storage medium on which a computer program or instruction is stored. The computer program or instruction is executed by a processor to perform a battery cell management method as described above.

[0017] Therefore, this application has at least the following beneficial effects:

[0018] In the embodiment of the present application, the host computer can send battery control instructions to the control board, and the control board controls the control elements of the battery cells to realize the battery cells responding to the battery control instructions, and the control board can monitor the power parameters of the battery cells in real time, and use the optical fiber temperature sensor to monitor the state parameters of the battery cells in real time, and transmit the power parameters and state parameters to the host computer, so that the host computer can manage each battery cell based on the state parameters and power parameters to realize the accurate monitoring of the state of the single battery in the battery module, so that the battery can be managed based on the state of the single battery in the future, thereby improving the quality of the battery and improving the reliability of the battery. Therefore, the technical problems such as the inability to accurately obtain the working state of the battery cell in the related technology are solved.

[0019] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0021] Figure 1 A schematic diagram of a battery cell management system provided according to an embodiment of the present application;

[0022] Figure 2 A schematic diagram of a battery cell provided according to an embodiment of the present application;

[0023] Figure 3 A schematic diagram of a battery module provided according to an embodiment of the present application;

[0024] Figure 4 A schematic diagram of the principle of a control panel provided according to an embodiment of the present application;

[0025] Figure 5 A schematic diagram of a partial enlargement of a control panel provided according to an embodiment of the present application;

[0026] Figure 6 A structural diagram of a battery cell management system provided according to an embodiment of the present application;

[0027] Figure 7 A flowchart of a battery cell management method provided according to an embodiment of the present application;

[0028] Figure 8 It is a schematic diagram of the structure of a host computer provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0029] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0030] Before describing the solution of the present application, the current related technology is introduced first.

[0031] Due to the limitations of current sensor technology solutions, only voltage, current and module surface temperature can be monitored at the smart battery system level or module level. The monitoring of module voltage and current mainly uses Hall sensors and shunt resistors and performs digital-to-analog conversion. However, for systems with a large number of batteries, it is difficult to monitor each battery at the module level. The system may overcharge aging batteries. In order to avoid this, the system will simultaneously reduce the capacity of other batteries in the group, resulting in the performance degradation of some batteries and affecting the performance of the entire system. Non-contact voltage and current monitoring will bring the disadvantages of weak anti-interference and large errors, while contact monitoring will change the nature of the circuit. Although new technologies such as optically coupled isolation amplifiers and discrete transistors can also be used for voltage and current monitoring, these technologies are not yet mature and have not been widely used. Thermistors and thermocouple sensors can be used to measure the temperature of lithium-ion batteries at the module level. Usually, the temperature measuring element is placed on the surface of the module. This method reduces the equipment cost and data volume, but affects the accuracy of system temperature measurement. Currently, BMS is unable to meet the needs of detailed battery monitoring. The extensive battery monitoring method can easily lead to the performance degradation of several battery cells, thus affecting the "short board effect" of the overall system performance.

[0032] To this end, the embodiments of the present application provide a battery cell management system, method, host computer and storage medium, which can eliminate the impact of the "short board effect" on the performance of the battery system from the battery cell level, enhance the battery self-monitoring capability, improve the battery's QRL characteristics (Quality, Reliability and Life), and achieve long-term and stable development of lithium-ion batteries.

[0033] Specifically, Figure 1 A schematic diagram of a battery cell management system provided in an embodiment of the present application.

[0034] like Figure 1 As shown, the battery cell management system 10 includes: a battery module 11 , a control element 12 , a control board 13 , an optical fiber temperature sensor 14 and a host computer 15 .

[0035] Among them, the battery module 11 includes multiple battery cells; the control element 12 is connected to each battery cell and is used to control the current direction of the battery cell; the control board 13 is connected to the control element 12 connected to each battery cell and is used to control the control element 12 according to the battery control instruction and monitor the power parameters of each battery cell; the optical fiber temperature sensor 14 is connected to each battery cell and is used to detect the state parameters of each battery cell; the host computer 15 is connected to the control board 13 and the optical fiber temperature sensor 14, and is used to send battery control instructions to the control board 13, and manage each battery cell according to the power parameters transmitted by the control board 13 and / or the state parameters transmitted by the optical fiber temperature sensor 14.

[0036] The battery may be a lithium-ion battery, the power parameters of the battery cell may be voltage, current, etc., the state parameters of the battery include the temperature and strain (expansion characteristics) of the battery, and the battery control instruction may be charging or discharging.

[0037] It should be noted that lithium-ion batteries undergo chemical reactions during the charge and discharge process, resulting in changes in the internal pressure of the battery, which in turn causes the battery to expand or contract. This physical change can be quantified by strain. The strain and temperature monitoring in the embodiment of the present application are specifically as follows: the FBG modem measures through optical fiber, and the FBG device generates an Excel file in real time on the host computer. The system can calculate the temperature and strain by reading Excel.

[0038] It can be understood that in the embodiment of the present application, the host computer 15 can send battery control instructions to the control board 13, and the control board 13 controls the control element 12 of the battery cell to realize the battery cell responding to the battery control instruction, and the control board 13 can monitor the power parameters of the battery cell in real time, and use the optical fiber temperature sensor 14 to monitor the state parameters of the battery cell in real time, and transmit the power parameters and state parameters to the host computer 15, so that the host computer 15 can manage each battery cell based on the state parameters and power parameters, so as to realize the accurate monitoring of the state of the single cell battery in the battery module 11, so that the battery can be managed based on the state of the single cell battery in the future, thereby improving the quality of the battery and improving the reliability of the battery.

[0039] In the embodiment of the present application, the control board 13 includes: a main control chip, a voltage monitoring module and a current monitoring module.

[0040] Among them, the main control chip is used to control the control element 12 according to the battery control instruction; the voltage monitoring module is used to monitor the voltage of each battery cell and the total voltage of the battery module; the current monitoring module is used to monitor the current of each battery cell and the current of each battery cell series branch.

[0041] It can be understood that the control board 13 of the embodiment of the present application includes three parts, a main control chip, a voltage monitoring module and a current monitoring module, wherein the main control chip is used to control the control element 12 according to the battery control instruction, the voltage monitoring module can monitor the voltage of each battery cell and the total voltage of the battery module, and the current monitoring module is used to monitor the current of each battery cell and the current of each battery cell series branch, thereby realizing the monitoring of the voltage and current of the battery cell.

[0042] In the embodiment of the present application, the control element 12 includes first to fourth control elements, and the control board 13 is further used for: if the battery control instruction is to charge the battery cell, the first control element of the corresponding battery cell is controlled to be turned on, and the second to fourth control elements are turned off; if the battery control instruction is to discharge the battery cell, the second control element of the corresponding battery cell is controlled to be turned on, and the first control element, the third control element, and the fourth control element are turned off.

[0043] It can be understood that the embodiments of the present application can determine the control element of each battery cell based on the type of battery control instruction. The control elements of each battery cell include four, the first to the fourth control elements. Specifically, when the battery control instruction is to charge the battery cell, the first control element and the second control element of the corresponding battery cell are controlled to be turned on; when the battery control instruction is to discharge the battery cell, the second control element of the corresponding battery cell is controlled to be turned on, and the first, third, and fourth control elements are turned off.

[0044] In the embodiment of the present application, the host computer 15 is further used to: if there is an abnormality in at least one of the voltage, temperature and strain of the battery cell, send an isolation control instruction to the control board 13, wherein the control board 13 controls the first control element and the second control element of the corresponding battery cell to be cut off according to the isolation control instruction, and the third control element and the fourth control element are turned on according to the current direction.

[0045] It can be understood that in the embodiment of the present application, when there is an abnormality in at least one of the voltage, temperature, and strain of the battery cell, an isolation control instruction is sent to the control board 13. The control board 13 controls the first control element and the second control element of the corresponding battery cell to be cut off according to the isolation control instruction, and the third control element and the fourth control element are turned on according to the current direction.

[0046] For example, if the temperature of the P1 battery cell is abnormal, an isolation control instruction of the P1 battery cell is sent to the control board, and the control board controls the first control element and the second control element of the P1 battery cell to be cut off, and the third control element and the fourth control element are turned on according to the current direction.

[0047] It should be noted that the method for determining whether there are abnormalities in the voltage, temperature and strain of the battery cell is that the voltage difference deviation exceeds the voltage deviation threshold, the temperature is higher than the temperature threshold, and the strain is higher than the strain threshold.

[0048] In the embodiment of the present application, the host computer 15 is further used to: calculate the current capacity and health status of the battery cell based on the charging capacity and discharging capacity corresponding to each battery cell; calculate the total current based on the current of the series branch of each battery cell; calculate the battery power status of the battery cell based on the total current and the total voltage of the battery module.

[0049] It can be understood that the embodiments of the present application can calculate the current capacity SOC and health state SOH of the battery cell based on the charging capacity and discharging capacity corresponding to each battery cell, and calculate the total current based on the current of the series branch of each battery cell, and then calculate the battery power state of the battery cell based on the total current and the total voltage of the battery module.

[0050] For example, SOC is the current capacity percentage of the battery, SOH is the battery health status, and SOP is the battery power status. The constant capacity procedure is: take 0.3 times the total current I 总 To charge the battery pack, the current value obtained by each branch is I1+I2+I3=0.3I 总 , the battery capacity obtained by each battery is Q = ∫I x dt(x=1, 2, 3), when the battery voltage reaches the upper cut-off voltage, the charging of the battery is stopped and the charging capacity Q of the battery is recorded. C , the remaining batteries continue to charge to the upper cut-off voltage and then stop; discharge the battery pack in the same way, when the battery voltage reaches the lower cut-off voltage, stop discharging the battery, and record the discharge capacity Q of the battery D . Battery capacity Q 定容 =(Q C +Q D ) / 2. SOC=Q 当前 / Q0,SOH=Q 定容 / Q0,SOP=U 端 *I 总 . SOC is updated every 5 minutes, SOH is updated every time the volume is fixed, and SOP is updated in real time.

[0051] The battery cell management system of the present application is described below through a specific embodiment.

[0052] The battery cell of the embodiment of the present application is Figure 1 As shown, it is the smallest unit equipped with a battery. A (first control element), B (second control element), C (third control element), and D (fourth control element) are control elements for controlling the current direction and bypassing the battery (not necessarily triodes, but any device that can realize the function is fine). Part I is the battery. The II connector is the charge and discharge control command level signal. All batteries are charged and discharged uniformly, and all battery cells share a common command. The III connector is the on / off function enable level signal. Each battery is controlled by a separate chip. All settings are valid at high levels, and each battery cell has one command. The basic working logic is that when the battery is in a normal state, when charging, part A is turned on, and B, C, and D are turned off. When discharging, part B is turned on, and A, C, and D are turned off. When the battery is abnormal, the abnormal battery needs to be bypassed, A and B are turned off, and C and D are selectively turned on according to the current direction. The logic timing of the control element is shown in Table 1.

[0053] Table 1

[0054]

[0055]

[0056] A battery module is constructed by forming a plurality of battery cells. The connection method of the battery cells is not specifically limited. The embodiment of the present application takes the "first series and then parallel" solution as an example, and uses the "three series and three parallel" example (the module can be scaled and expanded as required), such as Figure 3 As shown, all by Figure 2 The smallest unit structure shown.

[0057] Figure 4 The schematic diagram of the control board principle is shown below. According to the above description, the battery function of the III connector should have a signal command level for each battery, so there should be 9 pins in the main control chip to control 9 batteries respectively. All batteries have a unified signal at the charge and discharge command end, so 1 pin controls 9 batteries. The battery series-parallel connection method adopts the external circuit connection method, that is, the A, B, C, D connectors and 1, 2, 3 ports in the smallest unit are all independent on the chip periphery. The local enlargement of the control board is shown in the figure below. Figure 5 shown.

[0058] The control board uses a quasi-real-time monitoring method to monitor the voltage, that is, a time-sequential gating method is used to collect the voltage of only one battery at a time, and the acquisition and display are performed through digital-to-analog conversion. Battery temperature monitoring uses a similar method.

[0059] Isolation solution in the software program: If the voltage of other batteries has not reached the cut-off voltage, but a certain battery has reached the cut-off voltage, the battery will be bypassed; if a certain battery detects an obvious fault (specific faults such as short circuit, open circuit, abnormally high temperature), the battery will be bypassed; Corrective solution in the software program: When the system detects that the voltage of a certain battery deviates from the average voltage by 3% during charging and discharging, the battery will be temporarily bypassed, and charging and discharging balance will be supplemented after the system stabilizes depending on the deviation.

[0060] Based on the above structure, the structure of the battery cell management system in the embodiment of the present application is as follows: Figure 6As shown in the figure, the battery module is connected to the STM32 controller through three AFE interface modules using the IIC protocol, and the control board is connected to the host computer through the 232 interface. At this point, the battery module realizes the electrical signal connection, monitoring and control with the host computer. In order to realize the monitoring of the force and thermal signals of the battery module, an optical fiber modem is used to monitor the force and thermal signals of the battery. The optical fiber signal communicates with the host computer through the modem. The host computer integrates the electrical signal of the control board, the optical fiber mechanical signal and the optical fiber thermal signal, realizes the integration and monitoring of multi-source signals in the software, and performs early warning control of the key signals of the battery, and performs charging, discharging, balancing and related management measures on the battery.

[0061] 1. Voltage monitoring: A quasi-real-time monitoring method is used (for example, if all 9 battery voltages are traversed within 1 second, the voltage of one battery is scanned every one-ninth of a second). The monitoring accuracy is 0.01V, and the frequency of traversing all batteries is adjustable from 1Hz to 100Hz.

[0062] 2. Current monitoring: The current monitoring accuracy of each series branch is up to 0.01A, and the monitoring frequency is adjustable from 1Hz to 100Hz.

[0063] 3. Strain / temperature monitoring: measured by FBG modem through optical fiber, FBG device will generate Excel file on computer in real time, the system can calculate temperature and strain by reading Excel. (If the Excel file generated by FBG is opened during recording, the data cannot be written, and the program reading cannot affect the writing of FBG data).

[0064] 4. Real-time monitoring of terminal voltage and total current.

[0065] 5. All monitoring data are saved in real time to the computer in Excel file.

[0066] 6. SOC is the current capacity percentage of the battery, SOH is the battery health status, and SOP is the battery power status. The constant capacity procedure is: 0.3 times the total current I 总 To charge the battery pack, the current value obtained by each branch is I1+I2+I3=0.3I 总 , the battery capacity obtained by each battery is Q = ∫I x dt(x=1, 2, 3), when the battery voltage reaches the upper cut-off voltage, the charging of the battery is stopped and the charging capacity Q of the battery is recorded. C , the remaining batteries continue to charge to the upper cut-off voltage and then stop; discharge the battery pack in the same way, when the battery voltage reaches the lower cut-off voltage, stop discharging the battery, and record the discharge capacity Q of the battery D . Battery capacity Q 定容 =(Q C +Q D) / 2. SOC=Q 当前 / Q0,SOH=Q 定容 / Q0,SOP=U 端 *I 总 . SOC is updated every 5 minutes, SOH is updated every time the volume is fixed, and SOP is updated in real time.

[0067] 6. Status warning: When the battery voltage is higher than the upper voltage limit or lower than the lower voltage limit, the temperature is higher than a certain value (temperature limit), the strain is higher than a certain value (expansion limit); the voltage deviation of one or more batteries from the normal battery exceeds a certain value (voltage deviation), the temperature deviation of one or more batteries from the normal battery exceeds a certain value (temperature deviation), and the strain deviation of one or more batteries from the normal battery exceeds a certain value (expansion deviation). Relevant faults are identified and an alarm is given, and the alarm type and alarm battery serial number are displayed. When the voltage, temperature, and expansion return to normal values, the alarm is canceled.

[0068] 7. Fault isolation: When the voltage, temperature, or expansion of a cell reaches the threshold, the protection is triggered and the battery is bypassed. After protection, if the cell returns to the state of the remaining cells, the protection is released. If a battery is fault-isolated 5 times in total, the battery will no longer be enabled. The program should be able to reconnect the faulty battery back to the circuit (for example, cancel the abnormal flag and reconnect it to the circuit to work).

[0069] 8. Balance: During the system rest phase, bypass the normal battery, connect the battery with abnormal voltage, and charge or discharge the battery with abnormal voltage in the circuit with a total current of 0.3I to make it reach the voltage level of the normal battery. (The voltage of each battery deviates from the average voltage by less than 3%).

[0070] 7. Storage: Record parameters based on time: single cell voltage, charge and discharge current of each branch, single cell charge / discharge capacity, single cell temperature, single cell strain, total voltage, total current, etc. Store protection and alarm, protection and alarm recovery records.

[0071] According to the battery cell management system proposed in the embodiment of the present application, the host computer can send battery control instructions to the control board, and the control board controls the control elements of the battery cells to realize that the battery cells respond to the battery control instructions, and the control board can monitor the power parameters of the battery cells in real time, and use optical fiber temperature sensors to monitor the state parameters of the battery cells in real time, and transmit the power parameters and state parameters to the host computer, so that the host computer can manage each battery cell based on the state parameters and power parameters to realize accurate monitoring of the state of the single cell batteries in the battery module, so that the battery can be managed based on the state of the single cell batteries in the future, thereby improving the quality of the battery and improving the reliability of the battery.

[0072] An embodiment of the present application also provides a new energy vehicle, including a battery cell management system as described in the above embodiment.

[0073] Next, the battery cell management method proposed according to the embodiment of the present application is described with reference to the accompanying drawings.

[0074] Figure 7 It is a flow chart of the battery cell management method according to an embodiment of the present application.

[0075] like Figure 7 As shown, the battery cell management method includes the following steps:

[0076] In step S101 , a battery control instruction is sent to a control board, wherein the control board controls a control element of each battery cell according to the battery control instruction and monitors a power parameter of each battery cell.

[0077] The battery control instruction may be a charging instruction or a discharging instruction, and the power parameters may include voltage, current, etc.

[0078] It is understandable that the embodiment of the present application can send battery control instructions to the control board, and the control board controls the control elements of each battery cell according to the battery control instructions and monitors the power parameters of each battery cell.

[0079] In step S102, power parameters transmitted by the control board and state parameters transmitted by the optical fiber temperature sensor are acquired.

[0080] Among them, the state parameters include temperature and strain.

[0081] It can be understood that the embodiments of the present application can obtain the power parameters (current, voltage) transmitted by the control board and the state parameters (temperature and strain) transmitted by the optical fiber temperature sensor, so as to subsequently manage the battery cells based on the state parameters.

[0082] In step S103 , each battery cell is managed based on the power parameter and / or the state parameter.

[0083] It can be understood that the embodiments of the present application can manage each battery cell based on power parameters and state parameters, thereby improving the quality of the battery, improving the reliability and life of the battery, improving the QRL characteristics (Quality, Reliability and Life) of the battery, and realizing the long-term and stable development of lithium-ion batteries.

[0084] In an embodiment of the present application, each battery cell is managed based on power parameters and / or status parameters, including: calculating the current capacity and health status of the battery cell based on the charging capacity and discharging capacity corresponding to each battery cell; calculating the total current based on the current of each series branch of the battery cell; and calculating the battery power status of the battery cell based on the total current and the total voltage of the battery module.

[0085] It can be understood that the embodiments of the present application can calculate the current capacity SOC and health state SOH of the battery cell based on the charging capacity and discharging capacity corresponding to each battery cell, and calculate the total current based on the current of the series branch of each battery cell, and then calculate the battery power state of the battery cell based on the total current and the total voltage of the battery module, so as to achieve battery management.

[0086] In an embodiment of the present application, each battery cell is managed based on power parameters and / or state parameters, including: if at least one of the voltage, temperature and strain of the battery cell is abnormal, an isolation control instruction is sent to the control board, wherein the control board controls the first control element and the second control element of the corresponding battery cell to be cut off according to the isolation control instruction, and the third control element and the fourth control element are turned on according to the current direction.

[0087] It can be understood that the embodiments of the present application can send an isolation control instruction to the control board when there is an abnormality in at least one of the voltage, temperature and strain of any battery cell, wherein the control board controls the first control element and the second control element of the corresponding battery cell to be cut off according to the isolation control instruction, and the third control element and the fourth control element are selectively turned on according to the current direction, so as to bypass the abnormal circuit without affecting the operation of other battery cells.

[0088] It should be noted that the above explanations of the embodiment of the battery cell management system are also applicable to the battery cell management method of this embodiment, and will not be repeated here.

[0089] According to the battery cell management method proposed in the embodiment of the present application, battery control instructions can be sent to the control board to obtain the power parameters of the battery cells transmitted by the control board and the status parameters of the battery cells transmitted by the optical fiber temperature sensor, and then each battery cell can be managed based on the status parameters and power parameters to achieve accurate monitoring of the status of the single cells in the battery module, so that the battery can be managed based on the status of the single cells in the battery module, thereby improving the quality of the battery and improving the reliability of the battery.

[0090] Figure 8 A schematic diagram of the structure of the host computer provided in the embodiment of the present application. The host computer may include:

[0091] A memory 801 , a processor 802 , and a computer program stored in the memory 801 and executable on the processor 802 .

[0092] When the processor 802 executes the program, the battery cell management method provided in the above embodiment is implemented.

[0093] Furthermore, the host computer also includes:

[0094] The communication interface 803 is used for communication between the memory 801 and the processor 802 .

[0095] The memory 801 is used to store computer programs that can be executed on the processor 802 .

[0096] The memory 801 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0097] If the memory 801, the processor 802 and the communication interface 803 are implemented independently, the communication interface 803, the memory 801 and the processor 802 can be connected to each other through a bus and communicate with each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 8 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0098] Optionally, in a specific implementation, if the memory 801, the processor 802 and the communication interface 803 are integrated on a chip, the memory 801, the processor 802 and the communication interface 803 can communicate with each other through an internal interface.

[0099] The processor 802 may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application.

[0100] The embodiment of the present application also provides a computer-readable storage medium, on which a computer program or instruction is stored. When the computer program or instruction is executed by a processor, the above-mentioned battery cell management method is implemented.

[0101] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0102] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0103] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or N executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0104] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above embodiment, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one or a combination of multiple of the following technologies known in the art: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0105] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

Claims

1. A battery cell management system, characterized in that: include: A battery module, wherein the battery module comprises a plurality of battery cells; A control element connected to each battery cell, used to control the current direction of the battery cell; A control board connected to the control element connected to each battery cell, used to control the control element according to the battery control instruction and monitor the power parameters of each battery cell; An optical fiber temperature sensor connected to each battery cell, used to monitor the state parameters of each battery cell, wherein the state parameters include temperature and strain; The host computer connected to the control board and the optical fiber temperature sensor respectively is used to send the battery control instruction to the control board and manage each battery cell according to the power parameters transmitted by the control board and / or the state parameters transmitted by the optical fiber temperature sensor.

2. The battery cell management system according to claim 1, characterized in that: The control board includes: a main control chip, a voltage monitoring module and a current monitoring module, wherein: A main control chip, used to control the control element according to the battery control instruction; A voltage monitoring module, used to monitor the voltage of each battery cell and the total voltage of the battery module; The current monitoring module is used to monitor the current of each battery cell and the current of each battery cell series branch.

3. The battery cell management system according to claim 2, characterized in that: The control element comprises first to fourth control elements, and the control panel is further used for: If the battery control instruction is to charge the battery cell, the first control element of the corresponding battery cell is controlled to be turned on, and the second to fourth control elements are controlled to be turned off; If the battery control instruction is to discharge a battery cell, the second control element of the corresponding battery cell is controlled to be turned on, and the first control element, the third control element, and the fourth control element are turned off.

4. The battery cell management system according to claim 2, characterized in that: The host computer is further used for: If at least one of the voltage, temperature and strain of the battery cell is abnormal, an isolation control instruction is sent to the control board, wherein the control board controls the first control element and the second control element of the corresponding battery cell to be cut off according to the isolation control instruction, and the third control element and the fourth control element are turned on according to the current direction.

5. The battery cell management system according to claim 4, characterized in that: The host computer is further used for: Calculating the current capacity and health status of the battery cell based on the charge capacity and discharge capacity corresponding to each battery cell; Calculating the total current based on the current of each battery cell series branch; A battery power state of the battery cell is calculated based on the total current and the total voltage of the battery module.

6. A new energy vehicle, characterized in that: It comprises a battery monomer management system as described in any one of claims 1 to 5.

7. A battery cell management method, characterized in that: The battery monomer management system according to claims 1 to 5 is used for management, comprising the following steps: Sending a battery control instruction to a control board, wherein the control board controls a control element of each battery cell according to the battery control instruction and monitors a power parameter of each battery cell; Acquiring power parameters transmitted by the control board and state parameters transmitted by the optical fiber temperature sensor; Each battery cell is managed based on the power parameter and / or the state parameter.

8. The battery cell management method according to claim 7, characterized in that: The power parameters include current and voltage, the state parameters include temperature and strain, and the managing each battery cell based on the power parameters and / or the state parameters includes: Calculating the current capacity and health status of each battery cell based on the charge capacity and discharge capacity corresponding to the battery cell; Calculating the total current based on the current of each series branch of the battery cells; A battery power state of the battery cell is calculated based on the total current and the total voltage of the battery module.

9. The battery cell management method according to claim 8, characterized in that: The managing each battery cell based on the power parameter and / or the state parameter includes: If at least one of the voltage, temperature and strain of the battery cell is abnormal, an isolation control instruction is sent to the control board, wherein the control board controls the first control element and the second control element of the corresponding battery cell to be cut off according to the isolation control instruction, and the third control element and the fourth control element are turned on according to the current direction.

10. A host computer, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the battery cell management method according to any one of claims 7 to 9.

11. A computer-readable storage medium having a computer program or instruction stored thereon, characterized in that: The computer program or instruction is executed by a processor to implement the battery cell management method according to any one of claims 7 to 9.

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