Power battery voltage offline processing system and method

Abstract

The invention discloses a power battery voltage offline processing system and method. The method comprises the following steps: acquiring a voltage value of each single battery in a corresponding single battery pack and a total voltage value of the single battery pack through an analog front-end chip of a battery management system; calculating the cumulative sum of the voltage values of all the single batteries in the single battery pack, calculating the difference value between the total voltage value of the single battery pack and the cumulative sum of the voltage values of all the single batteries in the single battery pack, comparing the difference value with a preset dropped line voltage threshold value, and when the difference value exceeds the preset dropped line voltage threshold value, stopping the dropped line. If yes, a single battery in the single battery pack has a voltage disconnection fault; when the single batteries in the single battery pack have the voltage disconnection fault, the fault single battery with the voltage disconnection fault is positioned according to a preset voltage range, the fault voltage signal of the fault single battery is removed, and the removed fault voltage signal is represented by the average voltage of the non-fault single batteries in the single battery pack.

Description

Technical Field

[0001] This invention relates to the field of power battery voltage control, specifically to a power battery voltage drop handling system and method. Background Technology

[0002] In the field of electric vehicle technology, with the continuous growth of electric vehicle ownership and the significant increase in the frequency of power battery use, voltage sampling anomalies are becoming increasingly prominent. Especially under complex road conditions or assembly differences, they can easily cause brief sampling drops. Directly taking protective measures such as power-off not only affects driving safety but may also lead to a decline in driving experience. Existing technologies include voltage control schemes that, upon detecting a self-test fault, read fault data from non-volatile memory and trigger a protection mechanism through periodic over / under voltage detection. The protection mechanism includes disconnecting the relay and preventing its closure, limiting power, setting the collected voltage value to an invalid value, sending a fault flag bit to other functional modules of the vehicle and battery management system, sending a fault alarm to the vehicle, and triggering the vehicle's fault indicator light. Periodic over / under voltage detection includes detecting the cell voltage using the battery cell acquisition chip after normal power-on. If any single cell voltage is outside the preset voltage range, a hardware over / under voltage fault alarm is immediately triggered, and the fault protection mechanism is activated. This technical solution only focuses on whether the voltage is within a preset range, lacks in-depth processing of the sampled data, and is difficult to adapt to variable and abnormal scenarios; another solution effectively handles abnormal voltage by using the sampling line disconnection flag bit in the underlying transmission, but it relies heavily on the validity of the flag bit and can only deal with sampling abnormalities in two adjacent cells. It cannot effectively diagnose multiple irregular voltage abnormalities, which limits the breadth and reliability of its practical application. Summary of the Invention

[0003] The purpose of this invention is to provide a power battery voltage drop diagnosis and processing system and a power battery voltage drop diagnosis and processing method. The system and method integrate a difference comparison mechanism between the total voltage of the AFE and the sum of the individual cell voltages. When the difference exceeds a threshold, the sampling drop is accurately determined. The number of drops is dynamically determined by combining the difference magnitude. Then, abnormal values ​​are eliminated by voltage sorting and replaced with the average voltage within the module. This achieves robust processing of multiple sampling anomalies, significantly improves diagnostic accuracy and system adaptability, and effectively ensures the stable operation of the power battery system and driving safety.

[0004] To achieve this objective, the present invention provides a power battery voltage drop handling system, comprising: The voltage acquisition module is used to acquire the voltage value of each individual cell in the corresponding battery pack and the total voltage value of the battery pack through the analog front-end chip of the battery management system. The disconnection detection module is used to calculate the sum of the voltage values ​​of all individual cells in the battery pack based on the voltage values ​​of each individual cell in the battery pack, and to calculate the difference between the total voltage value of the battery pack and the sum of the voltage values ​​of all individual cells in the battery pack. The difference is compared with a preset disconnection voltage threshold. When the difference exceeds the preset disconnection voltage threshold, a single cell in the battery pack has a voltage disconnection fault. The voltage drop handling module is used to locate the faulty cell with voltage drop according to a preset voltage range when a cell in the battery pack experiences a voltage drop fault, and to remove the faulty cell's fault voltage signal. The removed fault voltage signal is represented by the average voltage of the non-faulty cells in the battery pack.

[0005] Furthermore, when the difference between the total voltage of the battery pack and the sum of the voltages of all individual cells in the battery pack is less than or equal to the preset voltage drop threshold, then no individual cell in the battery pack managed by the analog front-end chip has experienced a voltage drop fault.

[0006] Furthermore, the analog front-end chip also collects the temperature of the individual battery pack through multiple temperature sampling sensors to obtain multiple temperature sampling values, calculates the average temperature of the multiple temperature sampling values, compares each temperature sampling value with the average temperature, and when the difference between a temperature sampling value and the average temperature is greater than a preset outlier threshold, the temperature sampling value is replaced by the average temperature of the remaining non-abnormal temperature sampling values.

[0007] Furthermore, the method for locating the faulty individual cell that has experienced a voltage drop fault based on a preset voltage range includes: comparing the voltage value of each individual cell in the individual cell pack with the preset voltage range; the voltage value exceeding the preset voltage range is the fault voltage value; and locating the faulty individual cell based on the physical channel number of the fault voltage value.

[0008] Furthermore, the specific method for eliminating the fault voltage signal of the faulty individual battery includes: marking the voltage signal of the faulty individual battery as a replaceable signal, and replacing the replaceable signal with the average voltage of the remaining non-faulty individual batteries in the battery pack.

[0009] Furthermore, the preset voltage range is a threshold range dynamically determined based on historical voltage data under normal battery conditions and battery type.

[0010] Furthermore, it also includes a battery voltage control module, which uses the average voltage of the non-faulty individual cells as the actual voltage of the faulty individual cells to estimate the battery state of charge and perform voltage control.

[0011] Furthermore, if a single battery cell is continuously identified as having a voltage drop fault within multiple consecutive diagnostic cycles, then the single battery cell is marked as a single battery cell to be repaired.

[0012] Furthermore, a method for handling the voltage drop of a power battery based on the system includes: The voltage values ​​of each individual cell in the corresponding battery pack and the total voltage value of the battery pack are obtained through the analog front-end chip of the battery management system. The sum of the voltage values ​​of all individual cells in the battery pack is calculated based on the voltage values ​​of each individual cell in the battery pack. The difference between the total voltage value of the battery pack and the sum of the voltage values ​​of all individual cells in the battery pack is then calculated. This difference is compared with a preset voltage drop threshold. If the difference exceeds the preset voltage drop threshold, then a single cell in the battery pack has experienced a voltage drop fault. When a single cell in the battery pack experiences a voltage drop fault, the faulty single cell is located according to a preset voltage range, and the fault voltage signal of the faulty single cell is removed. The removed fault voltage signal is represented by the average voltage of the non-faulty single cells in the battery pack.

[0013] The beneficial effects of this invention are as follows: Addressing the shortcomings of existing power battery voltage sampling technologies, which can only perform simple voltage range detection without data processing and rely on underlying flag bits to effectively handle multiple sampling anomalies, this invention collects the voltage of each individual cell in a battery pack managed by each AFE (Analog Front-End Chip) and the total voltage of the battery pack. It then filters the voltage of each individual cell in the battery pack to eliminate interference. Subsequently, it calculates the difference between the sum of the voltages of each individual cell in the battery pack managed by each AFE and the total voltage of the battery pack. If the difference exceeds 2V, it determines that the battery pack has a voltage sampling failure. Furthermore, it sorts the voltages of each individual cell in the battery pack, eliminates abnormal voltages exceeding a preset normal voltage range threshold, and replaces the abnormal voltages with the average voltage of the non-faulty individual cells in the battery pack. This solution not only overcomes the limitations of existing technologies in data processing, but also improves the robustness and accuracy of the sampling system through real-time data analysis and intelligent filtering. This effectively avoids misjudgments and system failures caused by abnormal voltage sampling, enhances the reliability of power battery management, and ultimately improves the driving safety and driving experience of electric vehicles. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the AFE voltage acquisition method of the present invention; Figure 2 This is a schematic diagram of the process of the present invention; Figure 3 This is a schematic diagram of the structure of the present invention. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to represent selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: Example 1 like Figure 3 As shown, a power battery voltage drop handling system includes: The voltage acquisition module is used to acquire the voltage value of each individual cell in the corresponding battery pack and the total voltage value of the battery pack through the analog front-end chip of the battery management system. The disconnection detection module is used to calculate the sum of the voltage values ​​of all individual cells in the battery pack based on the voltage values ​​of each individual cell in the battery pack, and to calculate the difference between the total voltage value of the battery pack and the sum of the voltage values ​​of all individual cells in the battery pack. The difference is compared with a preset disconnection voltage threshold. When the difference exceeds the preset disconnection voltage threshold, a single cell in the battery pack has a voltage disconnection fault. The voltage drop handling module is used to locate the faulty cell with voltage drop according to a preset voltage range when a cell in the battery pack experiences a voltage drop fault, and to remove the faulty cell's fault voltage signal. The removed fault voltage signal is represented by the average voltage of the non-faulty cells in the battery pack.

[0017] As the number of electric vehicles continues to increase, the frequency of use of power batteries is also increasing. When power batteries experience various complex road conditions or differences in assembled components, voltage sampling anomalies may occur temporarily. If power is cut off directly, it will affect driving safety and driving experience. In existing technologies, there are voltage control schemes that read fault data from non-volatile memory after detecting a self-test fault and trigger a protection mechanism through periodic over- and under-voltage detection. The protection mechanism includes disconnecting the relay and preventing it from closing and limiting power, setting the collected voltage value to an invalid value, sending a fault flag bit to the vehicle and other functional modules of the battery management system, sending a fault alarm to the vehicle, and triggering the vehicle's fault light. Periodic over- and under-voltage detection includes detecting the cell voltage by the battery cell acquisition chip after normal power-on. If the voltage of any single cell is not within the preset voltage range, a hardware over- and under-voltage fault alarm will be immediately triggered, and the fault protection mechanism will be entered. This technical solution only focuses on whether the voltage is within a preset range, lacking in-depth processing of the sampled data and making it difficult to adapt to varied and abnormal scenarios. Another solution, which effectively handles abnormal voltages through a sampling line disconnection flag in the underlying transmission, heavily relies on the flag's validity and can only address sampling anomalies in two adjacent cells. It cannot effectively diagnose multiple irregular voltage anomalies, limiting its practical application and reliability. Therefore, this invention provides a method for handling power battery voltage sampling disconnection, taking countermeasures for abnormal sampling conditions to improve the driving experience. This invention collects the voltage of each individual cell in the battery pack managed by each AFE chip and the total voltage of the battery pack. It then determines the difference between the total voltage of the battery pack managed by each AFE and the sum of the voltages of all individual cells in that battery pack. If the difference is greater than 2V, it is determined that the battery pack managed by this AFE chip has a voltage sampling disconnection fault. Based on the difference, the number of disconnections is determined. If the voltage of any individual cell exceeds a preset normal range threshold voltage, this individual cell is removed and replaced with the average voltage of the non-faulty individual cells in the battery pack.

[0018] Figure 1 This is a schematic diagram of the voltage sampling of the AFE (Analog Front-End Chip) of the present invention. The battery management system has multiple AFE chips, and each AFE chip manages a group of individual cells. A group of individual cells includes, but is not limited to, 12 to 16 individual cells.

[0019] like Figure 2As shown, the process of this invention is as follows: detect the sampling voltage of all cells, detect the total voltage of all cell battery packs managed by all AFE chips, calculate the sum of the voltages of all cells in the cell battery pack managed by each AFE, calculate the difference between the total voltage of the cell battery pack managed by each chip and the sum of the voltages of that cell battery pack, if the difference is greater than 2V, it is determined that the cell battery pack has a sampling failure, the number of sampling failures in the cell battery pack is determined according to the size of the difference, the cell voltages in this AFE are sorted according to size and abnormal voltages are removed, the average cell voltage in each AFE is calculated, and the removed cell voltages are replaced by the average voltage in the AFE in which they are located.

[0020] In some embodiments, the method for obtaining the voltage value of each individual cell in a single battery pack includes: drawing a pair of voltage sampling lines from the positive and negative terminals of each individual cell; the voltage sampling lines are directly connected to a designated analog input channel of an analog front-end chip via a wiring harness and a connector; and the voltage signal of the individual battery cell is transmitted to the analog front-end chip via the voltage sampling lines.

[0021] The method for obtaining the total voltage value of a single battery pack includes: leading out two dedicated total voltage sampling lines from the beginning and end of the single battery pack and connecting them to the high voltage detection pin of the analog front-end chip; the total voltage sampling value of each analog front-end chip is transmitted to the analog front-end chip through the total voltage sampling lines.

[0022] Methods for calculating the sum of the voltage values ​​of all individual cells in a battery pack managed by an analog front-end chip include: ; in, For the first The sum of the voltage values ​​of all individual cells in a battery pack managed by an analog front-end chip. The total number of individual cells in the battery pack managed by each analog front-end chip. Within each analog front-end chip The voltage of each individual cell.

[0023] Methods for calculating the difference between the total voltage of a battery pack and the sum of the voltages of all individual cells in the battery pack include: ; in, For the first The difference between the total voltage value of a single battery cell in an analog front-end chip and the corresponding summation. For the first The total voltage sample value of the analog front-end chip For the first The sum of the voltage samples of all individual cells within an analog front-end chip.

[0024] In some technical solutions, when the difference between the total voltage of the battery pack and the sum of the voltages of all individual cells in the battery pack is less than or equal to a preset voltage drop threshold, then no individual cell in the battery pack managed by the simulated front-end chip will experience a voltage drop fault.

[0025] When the difference between the total voltage of the battery pack and the sum of the voltages of all individual cells in the battery pack is less than or equal to a preset dropout voltage threshold (which includes, but is not limited to, 2V), it is determined that no voltage sampling dropout fault has occurred in the individual cells managed by the analog front-end chip. This directly confirms the reliability of the current sampling system without initiating complex fault diagnosis and data reconstruction processes, thereby avoiding unnecessary consumption of computing resources. It ensures that the battery management system can continuously perform state estimation, power control, and safety protection strategies based on real and accurate voltage data, maintaining the system's stable operation under optimal conditions, while effectively preventing false voltage faults.

[0026] In some technical solutions, the analog front-end chip also collects the temperature of the individual battery pack through multiple temperature sampling sensors to obtain multiple temperature sampling values, calculates the average temperature of the multiple temperature sampling values, compares each temperature sampling value with the average temperature, and when the difference between a temperature sampling value and the average temperature is greater than a preset outlier threshold, the temperature sampling value is replaced by the average temperature of the remaining non-abnormal temperature sampling values.

[0027] By diagnosing abnormal temperature sampling values ​​and replacing average values, the system can automatically identify and remove distorted temperature data when a single temperature sensor malfunctions or samples abnormally. At the same time, it uses the average value of the remaining normal sensors for replacement, effectively avoiding interference from single-point temperature sampling failures on battery thermal management strategies. This ensures that the temperature information obtained by the system is continuously reliable, guarantees that the battery operates within a safe temperature range, and improves the accuracy of thermal runaway early warning and the overall safety of the battery system.

[0028] In some technical solutions, the method for locating the faulty individual cell that has experienced a voltage drop fault based on a preset voltage range includes: comparing the voltage value of each individual cell in the cell pack with the preset voltage range; the voltage value exceeding the preset voltage range is the fault voltage value; and locating the faulty individual cell based on the physical channel number of the fault voltage value.

[0029] By directly comparing the voltage value of each individual cell in the battery pack with a preset voltage range, and quickly locating the faulty individual cell based on the physical channel number corresponding to the fault voltage value exceeding the range, accurate identification of abnormal voltage sampling points and direct locking of the fault source can be achieved. This effectively avoids interference from abnormal data on battery status assessment, provides a clear target for subsequent fault elimination and data replacement, ensures that the battery management system can promptly eliminate the impact of single-point faults, maintain continuous and stable system operation, and significantly improve the efficiency and accuracy of fault diagnosis. The preset voltage range includes, but is not limited to, 2.5V~4.2V.

[0030] In some technical solutions, the specific method for eliminating the fault voltage signal of the faulty single cell includes: marking the voltage signal of the faulty single cell as a replaceable signal, and replacing the replaceable signal with the average voltage of the remaining non-faulty single cells in the single cell pack.

[0031] By marking the voltage signal of a faulty individual battery as a replaceable signal and replacing it with the average voltage of the remaining normal individual batteries in the same battery pack, abnormal data caused by a missing sampling line can be effectively shielded. This provides the battery management system with continuous and reasonable voltage estimates, avoids single-point faults triggering system-level protection or misjudgment, and thus maintains the stable operation of the power battery under fault-tolerant conditions.

[0032] In some technical solutions, the preset voltage range is a threshold range dynamically determined based on historical voltage data under normal battery type and normal operating conditions.

[0033] In some embodiments, when the battery system is operating normally, voltage data of each individual cell is continuously collected and recorded under various typical operating conditions, such as: voltage during acceleration, deceleration, and cruising during driving; voltage after the vehicle has been stationary for different periods during rest; and voltage at different charging rates during charging. This data is associated with and stored according to battery type (e.g., ternary lithium, lithium iron phosphate, etc.). Based on the stored historical voltage data, the following calculations are performed: Average value: The average value of historical voltage data for each cell at a specific SOC (State of Charge) and temperature is calculated; Standard deviation: The dispersion of these historical voltage data relative to the average value is calculated; Dynamic range setting: The preset voltage range can be set as (average value - N × standard deviation, average value + M × standard deviation). Here, N and M are coefficients set empirically (including but not limited to 3) used to define the boundaries of normal voltage fluctuations in individual cells. Voltage values ​​falling within the preset voltage range have a very high probability of being normal voltage fluctuations; points exceeding this range are considered low-probability events, i.e., abnormal voltage fluctuations.

[0034] Dynamically determining the preset voltage range based on historical voltage data under normal battery type and operating conditions allows the threshold setting to conform to the characteristics of different battery systems and actual aging and degradation patterns. This effectively avoids misjudgment problems caused by individual battery differences, temperature changes, and lifespan degradation due to fixed thresholds, thereby improving the accuracy of voltage sampling fault diagnosis and system robustness. It ensures that the battery management system can reliably identify anomalies and optimize fault-tolerant control strategies under different operating conditions.

[0035] Some technical solutions also include a battery voltage control module, which uses the average voltage of the non-faulty individual cells as the actual voltage of the faulty individual cells to estimate the battery state of charge and perform voltage control.

[0036] The battery voltage control module replaces the abnormal voltage signal of the faulty individual cell with the average voltage value of the remaining normal individual cells in the battery pack, and inputs this replacement value as the actual voltage of the faulty battery to the battery management system. In this way, when one or more voltage sampling channels fail, it provides a continuous and reasonable voltage data source for battery state of charge estimation, ensuring that the accuracy of SOC estimation is not affected by local sampling failures. At the same time, it maintains the stability of system voltage balance and power control strategy, effectively avoiding conservative power limiting or system shutdown caused by missing or abnormal voltage data, and ensuring the continuous safe operation and driving experience of electric vehicles under fault-tolerant conditions.

[0037] In some technical solutions, if a single battery cell is continuously identified as having a voltage drop fault within multiple consecutive diagnostic cycles, then the single battery cell is marked as a single battery cell to be repaired.

[0038] Marking individual battery packs that continuously experience voltage drop faults as requiring maintenance across multiple diagnostic cycles effectively distinguishes between transient interference and permanent hardware failures. This enables trend-based assessment and tiered early warning of the battery system's health status, providing maintenance personnel with clear guidance on fault location and repair priorities. This prevents the system from operating in a degraded, fault-tolerant state for extended periods and facilitates timely intervention to replace or repair faulty battery modules. Ultimately, this eliminates safety hazards, restores the overall performance and reliability of the battery system, and extends the battery pack's lifespan.

[0039] This invention addresses the shortcomings of existing power battery voltage sampling technologies, which can only perform simple voltage range detection without data processing and rely on low-level flags to effectively handle multiple sampling anomalies. This invention collects the voltage of each individual cell in a battery pack managed by each AFE (Analog Front-End Chip) and the total voltage of the battery pack. The voltage of each individual cell in the battery pack is then filtered to eliminate interference. Subsequently, the difference between the sum of the voltages of each individual cell in the battery pack managed by each AFE and the total voltage of the battery pack is calculated. If the difference exceeds 2V, the battery pack is determined to have a voltage sampling failure. Furthermore, the voltages of each individual cell in the battery pack are sorted, and abnormal voltages exceeding a preset normal voltage range threshold are removed. The average voltage of the non-faulty individual cells in the battery pack is then used to replace the abnormal voltages. This solution not only overcomes the limitations of existing technologies in data processing, but also improves the robustness and accuracy of the sampling system through real-time data analysis and intelligent filtering. This effectively avoids misjudgments and system failures caused by abnormal voltage sampling, enhancing the reliability of power battery management and ultimately improving the driving safety and experience of electric vehicles.

[0040] Example 2 A method for handling power battery voltage drop based on the system includes: The voltage values ​​of each individual cell in the corresponding battery pack and the total voltage value of the battery pack are obtained through the analog front-end chip of the battery management system. The sum of the voltage values ​​of all individual cells in the battery pack is calculated based on the voltage values ​​of each individual cell in the battery pack. The difference between the total voltage value of the battery pack and the sum of the voltage values ​​of all individual cells in the battery pack is then calculated. This difference is compared with a preset voltage drop threshold. If the difference exceeds the preset voltage drop threshold, then a single cell in the battery pack has experienced a voltage drop fault. When a single cell in the battery pack experiences a voltage drop fault, the faulty single cell is located according to a preset voltage range, and the fault voltage signal of the faulty single cell is removed. The removed fault voltage signal is represented by the average voltage of the non-faulty single cells in the battery pack.

[0041] Example 3 The present invention provides a computer-readable storage medium storing a computer program, which, when executed by a processor, performs the steps of the method described in Embodiment 2.

[0042] This invention can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented in whole or in part as a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this invention are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., a solid-state drive (SSD)).

[0043] It will be readily understood by those skilled in the art that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, combinations, substitutions, improvements, etc., made under the spirit and principles of the present invention are included within the protection scope of the present invention.

[0044] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

Claims

1. A power battery voltage drop processing system, characterized in that, The application comprises: a voltage acquisition module for acquiring voltage values of each single battery in a corresponding single battery group and a total voltage value of the single battery group through an analog front-end chip of a battery management system; a drop-off judgment module for calculating a cumulative sum of voltage values of all single batteries in the single battery group according to the voltage values of each single battery in the single battery group, calculating a difference between the total voltage value of the single battery group and the cumulative sum of the voltage values of all single batteries in the single battery group, comparing the difference with a preset drop-off voltage threshold value, and determining that a single battery in the single battery group has a voltage drop-off fault when the difference exceeds the preset drop-off voltage threshold value; a drop-off processing module for locating a fault single battery having a voltage drop-off fault according to a preset voltage range when a single battery in the single battery group has a voltage drop-off fault, and eliminating a fault voltage signal of the fault single battery, wherein the eliminated fault voltage signal is represented by an average voltage of non-fault single batteries in the single battery group.

2. The system for processing voltage drop of power battery according to claim 1, wherein: When the difference between the total voltage value of the single battery group and the cumulative sum of the voltage values of all single batteries in the single battery group is less than or equal to the preset drop-off voltage threshold value, no single battery in the single battery group managed by the analog front-end chip has a voltage drop-off fault.

3. The system for processing voltage drop of a power battery according to claim 1 or 2, characterized in that: The analog front-end chip further collects temperatures of the single battery group through a plurality of temperature sampling sensors to obtain a plurality of temperature sampling values, calculates a temperature average value of the plurality of temperature sampling values, and compares each temperature sampling value with the temperature average value, wherein a temperature sampling value is replaced by a temperature average value of remaining non-abnormal temperature sampling values when a difference between the temperature sampling value and the temperature average value is greater than a preset outlier threshold value.

4. The system for processing voltage drop of a power battery according to claim 1, wherein, The method for locating a fault single battery having a voltage drop-off fault according to a preset voltage range comprises: comparing a voltage value of each single battery in the single battery group with a preset voltage range, wherein a voltage value exceeding the preset voltage range is a fault voltage value, and locating the fault single battery according to a physical channel number of the fault voltage value.

5. The system for processing voltage drop of a power battery according to claim 4, characterized in that: The specific method for eliminating the fault voltage signal of the fault single battery comprises: marking the voltage signal of the fault single battery as a replaceable signal, and replacing the replaceable signal with an average voltage of remaining non-fault single batteries in the single battery group.

6. A method for processing voltage drop of a power battery based on the system of claim 1 or 4, characterized in that, The preset voltage range is a threshold range dynamically determined based on a battery type and historical voltage data in a normal working state.

7. A method for handling power battery voltage drop according to claim 1, characterized in that, The application further comprises a battery voltage control module for taking the average voltage of the non-fault single battery as an actual voltage of the fault single battery, estimating a battery state of charge, and performing voltage control.

8. The method of claim 1, wherein the method further comprises: determining that the voltage of the power battery has dropped below a predetermined threshold; and activating the power battery voltage drop-out process. In a plurality of continuous diagnosis cycles, if the single battery group is continuously determined to have a voltage drop-off fault, the single battery group is marked as a single battery group to be repaired.

9. A method for processing voltage drop of a power battery based on the system of claim 1, characterized in that, The application comprises: acquiring voltage values of each single battery in a corresponding single battery group and a total voltage value of the single battery group through an analog front-end chip of a battery management system; The voltage values of all the single batteries in the single battery pack are added according to the voltage values of the single batteries in the single battery pack, and a difference between the total voltage value of the single battery pack and the added voltage values of all the single batteries in the single battery pack is calculated, the difference is compared with a preset off-line voltage threshold, and when the difference exceeds the preset off-line voltage threshold, it is determined that a single battery in the single battery pack has a voltage off-line fault; When a single battery in the single battery pack has a voltage off-line fault, the fault single battery is located according to a preset voltage range, and a fault voltage signal of the fault single battery is eliminated, and the eliminated fault voltage signal is represented by an average voltage of non-fault single batteries in the single battery pack.

10. A computer program product comprising a computer program, characterized in that, The computer program, when executed by a processor, implements the steps of the method in claim 9.

Images