Power battery fast charging overcurrent protection method and device, electronic equipment, medium and product

Abstract

The invention discloses a power battery fast charging overcurrent protection method and device, electronic equipment, a medium and a product. The method comprises the following steps: acquiring battery state parameters of a power battery during fast charging; determining the current fast charging capacity of the power battery according to the battery state parameters; performing over-current detection according to the battery state parameters, the current fast charging capacity and a preset current sensor effective value upper limit to obtain an over-current fault judgment result; and when it is determined that the power battery has an overcurrent fault according to the overcurrent fault judgment result, performing corresponding overcurrent protection control on the power battery. The method can solve the problems that real overcurrent and sensor misinformation cannot be distinguished, and response is slow.

Description

Technical Field

[0001] This application relates to the field of battery management technology, specifically to a method, device, electronic device, readable storage medium, and computer program product for fast charging overcurrent protection of power batteries. Background Technology

[0002] During fast charging of new energy vehicles, the power battery faces complex current surges due to changes in its own state and vehicle load. Simultaneously, malfunctions in the charging station can trigger large currents far exceeding the battery's capacity, necessitating reliable and rapid overcurrent protection. Existing technologies typically trigger protection by calculating the overcurrent area during fast charging and comparing it to a threshold. However, these methods rely solely on current values ​​for diagnosis. When the current sensor itself malfunctions and falsely reports a large current, it can easily lead to system misjudgment, causing unnecessary charging interruptions and impacting the user's fast charging experience. Furthermore, existing solutions, when faced with real, sudden abnormal large currents, often suffer from response delays due to their cumulative area-based judgment method, failing to quickly identify overcurrents in their initial stages. This increases the risk of damage to the battery pack and high-voltage electrical components due to instantaneous overcurrent. Summary of the Invention

[0003] In view of the above problems, this application provides a method, device, electronic device, readable storage medium and computer program product for fast charging protection of power batteries, which can solve the problems of being unable to distinguish between real overcurrent and sensor false alarms and slow response.

[0004] Firstly, this application provides a method for overcurrent protection during fast charging of a power battery, including: Obtain battery status parameters of the power battery during fast charging; The current fast charging capability of the power battery is determined based on the battery state parameters; Overcurrent detection is performed based on the battery status parameters, the current fast charging capability, and the preset upper limit of the effective value of the current sensor to obtain the overcurrent fault determination result; When an overcurrent fault is determined to exist in the power battery based on the overcurrent fault determination result, corresponding overcurrent protection control is performed on the power battery.

[0005] In the above technical solution, the method can accurately match the battery's tolerance boundary with the actual battery state, avoiding misjudgment based on a fixed threshold; at the same time, it can also distinguish between real overcurrent and sensor false alarms by integrating battery state, tolerance capacity and sensor effective value upper limit, thus improving detection accuracy; finally, it can also quickly respond to real overcurrent faults, avoid damage to the battery and high-voltage components, and reduce charging interruptions caused by false protection.

[0006] In some implementations, the battery state parameters include at least the real-time sampled current detected by the current sensor, the maximum single-cell capacity, the minimum single-cell capacity, the highest module temperature, the lowest module temperature, the total battery pack voltage, and the highest single-cell voltage.

[0007] In the above technical solution, the method can comprehensively characterize the real-time operating condition of the power battery by collecting multi-dimensional parameters covering current, power balance, temperature distribution and voltage state, providing accurate and comprehensive basic data support for subsequent fast charging capability evaluation and overcurrent detection.

[0008] In some implementations, determining the current fast-charging capability of the power battery based on the battery state parameters includes: The current fast charging capability of the power battery is determined by looking up a table based on the maximum single-cell capacity, the minimum single-cell capacity, the highest module temperature, and the lowest module temperature. The current fast charging capability includes the maximum allowable charging current of the power battery in the current state.

[0009] In the above technical solution, the method can accurately match the current maximum allowable charging current based on the battery power balance and temperature distribution, so that the fast charging capability assessment is in line with the real-time operating conditions of the battery.

[0010] In some implementations, the step of performing overcurrent detection based on the battery state parameters, the current fast charging capability, and a preset upper limit of the effective value of the current sensor to obtain an overcurrent fault determination result includes: When the real-time sampled current is not greater than the preset upper limit of the effective value of the current sensor, a first current threshold and a second current threshold are determined based on the current fast charging capability. When the real-time sampling current is continuously greater than the first current threshold during the first preset time period, or when the real-time sampling current is continuously greater than the second current threshold during the second preset time period, the overcurrent fault determination result is determined to be an overcurrent fault, and the step of performing corresponding overcurrent protection control on the power battery is executed. The first current threshold is calculated based on the current fast charging capability, the first preset proportional coefficient, and the first offset value; the second current threshold is calculated based on the current fast charging capability, the second preset proportional coefficient, and the second offset value; the second preset proportional coefficient is greater than the first preset proportional coefficient, and the second offset value is greater than the first offset value.

[0011] In the above technical solution, the method can filter sampling anomalies by combining the upper limit of the effective value of the current sensor, and accurately identify different degrees of real overcurrent through the judgment logic of dual thresholds (different proportional coefficients and offset values) and corresponding durations, thereby avoiding false protection caused by false alarms of the sensor and realizing graded and rapid response to overcurrent faults, ensuring detection accuracy and timeliness.

[0012] In some embodiments, the method further includes: When the real-time sampling current is greater than the upper limit of the effective value of the current sensor, if the real-time sampling current continues to be greater than the second current threshold within a third preset time period, overcurrent detection is performed based on the total voltage of the battery pack and the highest voltage of the individual cell to obtain an overcurrent fault determination result.

[0013] In the above technical solution, the method can eliminate false judgments caused by sensor abnormalities by combining secondary verification of voltage parameters in scenarios where the current sensor sampling exceeds the upper limit of the effective value. At the same time, through the judgment logic of preset time period and second current threshold, it can accurately identify the real overcurrent fault in the scenario and ensure the reliability of overcurrent detection.

[0014] In some embodiments, the overcurrent detection based on the total voltage of the battery pack and the highest voltage of the individual cells to obtain an overcurrent fault determination result includes: If the change in the total voltage of the battery pack exceeds the preset voltage change threshold within the fourth preset time period, or if the highest voltage of the individual cell is greater than the pre-calibrated full charge voltage, the overcurrent fault determination result is determined to be an overcurrent fault, and the step of performing corresponding overcurrent protection control on the power battery is executed.

[0015] In the above technical solution, the method can accurately verify whether the sampling current exceeding the upper limit of the effective value of the sensor corresponds to the real overcurrent by dual voltage verification of the total voltage change of the battery pack and the highest voltage of the individual cells, further eliminating false alarms of sensor abnormalities, ensuring the accuracy of overcurrent fault judgment, and avoiding false protection or missed protection.

[0016] Secondly, this application provides a power battery fast charging overcurrent protection device, comprising: The acquisition unit is used to acquire the battery state parameters of the power battery during fast charging. A determining unit is used to determine the current fast charging capability of the power battery based on the battery state parameters; The overcurrent detection unit is used to perform overcurrent detection based on the battery status parameters, the current fast charging capability, and the preset upper limit of the effective value of the current sensor, and to obtain the overcurrent fault determination result. The overcurrent protection unit is used to perform corresponding overcurrent protection control on the power battery when it is determined that there is an overcurrent fault in the power battery based on the overcurrent fault determination result.

[0017] In the above technical solution, the device can accurately match the battery's tolerance boundary based on the actual battery state, avoiding misjudgments based on fixed thresholds; at the same time, it can also distinguish between real overcurrent and sensor false alarms by integrating battery state, tolerance capacity and sensor effective value upper limit, thus improving detection accuracy; finally, it can also quickly respond to real overcurrent faults, avoiding damage to the battery and high-voltage components, while reducing charging interruptions caused by false protection.

[0018] Thirdly, this application provides an electronic device, which includes a memory and a processor. The memory stores a computer program, and the processor runs the computer program to enable the electronic device to perform the power battery fast charging overcurrent protection method described in any one of the first aspects.

[0019] Fourthly, this application provides a readable storage medium storing a computer program, which, when executed by a processor, performs the power battery fast charging overcurrent protection method described in any one of the first aspects.

[0020] Fifthly, this application provides a computer program product, which includes a computer program that, when executed by a processor, performs the power battery fast charging overcurrent protection method described in any one of the first aspects.

[0021] The beneficial effects of this application are: it can overcome the sampling range limitation of current sensors, use voltage parameters to assist in judgment, realize accurate judgment and graded rapid response of overcurrent faults, ensure the safety of power batteries and high-voltage components, reduce false protection, adapt to fast charging scenarios, and optimize the fast charging experience. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a flowchart illustrating the overcurrent protection method for fast charging of a power battery in some embodiments of this application. Figure 2 This is a flowchart illustrating the overcurrent protection method for fast charging of a power battery in some embodiments of this application. Figure 3This is a schematic flowchart illustrating an example of a fast-charging overcurrent protection method for a power battery in some embodiments of this application. Figure 4 This is a schematic diagram of the structure of the power battery fast charging overcurrent protection device in some embodiments of this application; Figure 5 This is a schematic diagram of the structure of an electronic device in some embodiments of this application. Detailed Implementation

[0024] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0026] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more (including two), similarly, "multiple sets" refers to two or more sets (including two sets), and "multiple pieces" refers to two or more pieces (including two pieces) unless otherwise explicitly defined.

[0027] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0028] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0029] The charging capacity of a power battery varies under different conditions such as temperature, SOC, and single-cell voltage. In addition, load consumption is added during fast charging, which may cause the charging current requested by the vehicle to change at any time. If the charging pile responds slowly, the fast charging current may exceed the battery charging capacity and cause overcurrent. At the same time, if there is an abnormality in the internal isolation or control of the charging pile, a fast charging current far exceeding the battery charging capacity may also occur. These two overcurrent situations need to be accurately identified and differentiated for protection.

[0030] Most existing methods for overcurrent protection in fast charging compare the current with the battery's charging capacity. If the current consistently exceeds the charging capacity for a certain period, an anomaly is detected, and fast charging is stopped. Other solutions distribute the overcurrent power to the load for heating or cooling to offset or reduce the overcurrent amplitude, or calculate the overcurrent area during fast charging; when the area exceeds a corresponding threshold, fast charging is stopped or the fast charging relay is disconnected. However, these solutions have slow response times for diagnosing abnormally high currents and also struggle to effectively distinguish between a genuine high current and a false alarm from a current sensor malfunction.

[0031] To address the aforementioned technical issues, this application provides a method for overcurrent protection during fast charging of power batteries. This method can accurately match the battery's tolerance boundary based on its actual state, avoiding misjudgments based on fixed thresholds. Furthermore, it can distinguish between real overcurrent and sensor false alarms by integrating battery state, tolerance capacity, and the upper limit of sensor effective values, thus improving detection accuracy. Finally, it can quickly respond to real overcurrent faults, preventing damage to the battery and high-voltage components, while reducing charging interruptions caused by false protection.

[0032] like Figure 1 As shown, some embodiments of this application provide a method for overcurrent protection during fast charging of a power battery, which includes: S101. Obtain the battery status parameters of the power battery during fast charging. S102. Determine the current fast charging capability of the power battery based on the battery status parameters; S103. Based on the battery status parameters, current fast charging capability, and preset upper limit of the effective value of the current sensor, perform overcurrent detection to obtain the overcurrent fault judgment result. S104. When it is determined that there is an overcurrent fault in the power battery based on the overcurrent fault judgment result, the power battery shall be subject to corresponding overcurrent protection control.

[0033] In some embodiments, battery state parameters refer to relevant parameters that characterize the state of the power battery during fast charging, including at least the real-time sampling current detected by the current sensor, the maximum single-cell capacity, the minimum single-cell capacity, the highest module temperature, the lowest module temperature, the total voltage of the battery pack, and the highest voltage of a single cell.

[0034] In some embodiments, the current fast charging capability refers to the fast charging adaptability of the power battery determined based on real-time state parameters, including the maximum allowable charging current under the current state.

[0035] In some embodiments, the preset upper limit of the effective value of the current sensor refers to the threshold value of the maximum current that the current sensor can accurately sample when it is working normally.

[0036] In some embodiments, overcurrent detection refers to the process of determining whether a power battery has an overcurrent fault by combining battery state parameters, current fast charging capability, and the upper limit of the effective value of the current sensor.

[0037] In some embodiments, the overcurrent fault determination result refers to the conclusion of whether the power battery has an overcurrent fault, obtained through overcurrent detection.

[0038] In some embodiments, overcurrent protection control refers to the corresponding protective operation performed to avoid damage to the battery and high-voltage components when an overcurrent fault is detected in the power battery.

[0039] In the above embodiments, the method can accurately match the battery's tolerance boundary based on the actual battery state, avoiding misjudgments based on fixed thresholds; at the same time, it can also distinguish between real overcurrent and sensor false alarms by fusing battery state, tolerance capacity and sensor effective value upper limit, thus improving detection accuracy; finally, it can also quickly respond to real overcurrent faults, avoid damage to the battery and high-voltage components, and reduce charging interruptions caused by false protection.

[0040] In some embodiments, battery status parameters include at least the real-time sampled current detected by the current sensor, the maximum single-cell capacity, the minimum single-cell capacity, the highest module temperature, the lowest module temperature, the total battery pack voltage, and the highest single-cell voltage.

[0041] For example, this method can collect in real time the current value BattCur reported by the current sensor, the maximum and minimum single cell SOC of the battery, the maximum and minimum module temperature of the battery, the total voltage of the battery pack BattVolt, and the maximum single cell voltage UCellMax.

[0042] In the above embodiments, the method can comprehensively characterize the real-time operating condition of the power battery by collecting multi-dimensional parameters covering current, power balance, temperature distribution, and voltage state, providing accurate and comprehensive basic data support for subsequent fast charging capability evaluation and overcurrent detection.

[0043] In some embodiments, determining the current fast charging capability of the power battery based on battery state parameters includes: The current fast charging capability of the power battery is determined by looking up a table based on the maximum single cell capacity, minimum single cell capacity, highest module temperature, and lowest module temperature. The current fast charging capability includes the maximum allowable charging current of the power battery under the current condition.

[0044] For example, this method can determine the current fast charging capability (ICAP) by looking up a table based on the battery's maximum single-cell SOC, minimum single-cell SOC, highest module temperature, and lowest module temperature. The table lookup method uses a step-wise lookup approach followed by taking the minimum value, and simultaneously applies hysteresis processing to the temperature or SOC parameters during the lookup process.

[0045] In the above embodiments, the method can accurately match the current maximum allowable charging current based on the battery power balance and temperature distribution, so that the fast charging capability assessment is in line with the real-time operating conditions of the battery.

[0046] In some embodiments, overcurrent detection is performed based on battery state parameters, current fast charging capability, and a preset upper limit of the effective value of the current sensor to obtain an overcurrent fault determination result, including: When the real-time sampled current is not greater than the preset upper limit of the effective value of the current sensor, the first current threshold and the second current threshold are determined according to the current fast charging capability. When the real-time sampled current is continuously greater than the first current threshold during the first preset time period, or when the real-time sampled current is continuously greater than the second current threshold during the second preset time period, the overcurrent fault determination result is determined to be an overcurrent fault, and the corresponding overcurrent protection control steps for the power battery are executed. The first current threshold is calculated based on the current fast charging capability, the first preset proportional coefficient, and the first offset value; the second current threshold is calculated based on the current fast charging capability, the second preset proportional coefficient, and the second offset value; the second preset proportional coefficient is greater than the first preset proportional coefficient, and the second offset value is greater than the first offset value.

[0047] For example, this method can first set the upper limit of the effective value of the current sensor to ISPEC.

[0048] When the current sampling current is less than or equal to ISPEC, this method determines the fault based solely on the current parameter. In this case, an overcurrent fault is identified if any of the following conditions are met: (1) The real-time charging current BattCur is greater than 1.2 times the charging capacity ICAP+2A, and this state lasts for 10s; (2) The real-time charging current BattCur is greater than 1.3 times the maximum charging capacity ICAP+50A within 10s, and this state lasts for 300ms.

[0049] In the above embodiments, the method can filter sampling anomalies by combining the upper limit of the effective value of the current sensor, and accurately identify real overcurrents of different degrees through the judgment logic of dual thresholds (different proportional coefficients and offset values) and corresponding durations, thereby avoiding false protection caused by false alarms of the sensor and realizing graded and rapid response to overcurrent faults, ensuring detection accuracy and timeliness.

[0050] In some embodiments, the method further includes: If the real-time sampled current is greater than the upper limit of the effective value of the current sensor, and if the real-time sampled current continues to be greater than the second current threshold within the third preset time period, overcurrent detection is performed based on the total voltage of the battery pack and the highest voltage of the individual cells to obtain the overcurrent fault judgment result.

[0051] In some embodiments, if the real-time sampled current BattCur exceeds the effective value limit ISPEC of the current sensor, this situation is considered to be a false exceedance caused by an abnormal sampling of the current sensor. Based on this, the method proposes an auxiliary method to determine whether there is a real abnormally large current by introducing the total battery pack voltage BattVolt and the highest voltage of a single cell UCellMax.

[0052] In the above embodiments, the method can eliminate false judgments caused by sensor abnormalities in scenarios where the current sensor sampling exceeds the upper limit of the effective value, by combining secondary verification of voltage parameters. At the same time, through the judgment logic of preset time period and second current threshold, it can accurately identify the real overcurrent fault in the scenario and ensure the reliability of overcurrent detection.

[0053] In some embodiments, overcurrent detection is performed based on the total voltage of the battery pack and the highest voltage of each individual cell to obtain an overcurrent fault determination result, including: If the change in the total voltage of the battery pack exceeds the preset voltage change threshold within the fourth preset time period, or the highest voltage of a single cell is greater than the pre-calibrated full charge voltage, the overcurrent fault determination result is determined to be an overcurrent fault, and the corresponding overcurrent protection control steps for the power battery are executed.

[0054] For example, the above judgment method is as follows: |BattVolt max -BattVolt t | t=0~300ms ≥20V; As can be seen, this method determines that if the increase in the total battery pack voltage BattVolt exceeds 20V within 300ms in charging mode, the voltage determination condition is met. In summary, considering the consistency of voltage and current sampling, the voltage determination result will be latched for 500ms (i.e., the determination state will be maintained for 500ms).

[0055] At this point, the complete condition for determining fast charging overcurrent is: (1) The real-time sampling current BMS_BattCurr is greater than or equal to the preset upper limit of the effective value of the current sensor ISPEC; (2) The charging current BattCur is greater than 1.3 times the sum of the charging capacity ICAP and 50A, and this state lasts for 300ms; (3) The following voltage conditions are met: the condition of the total voltage of the battery pack being pulled up by 20V is met; or the voltage of a single cell is greater than the pre-calibrated full charge voltage.

[0056] In the above embodiments, the method can accurately verify whether the sampling current exceeding the upper limit of the effective value of the sensor corresponds to the real overcurrent by dual voltage verification of the total voltage change of the battery pack and the highest voltage of the individual cells, further eliminating false alarms of sensor abnormalities, ensuring the accuracy of overcurrent fault determination, and avoiding false protection or missed protection.

[0057] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below. In some embodiments, such as Figure 2 As shown, the fast charging overcurrent protection method for power batteries includes: S201. Obtain the battery status parameters of the power battery during fast charging. S202. Based on the maximum single cell capacity, minimum single cell capacity, highest module temperature, and lowest module temperature, look up the table to determine the current fast charging capability of the power battery, and then proceed to step S203 or S205. S203. When the real-time sampled current is not greater than the preset upper limit of the effective value of the current sensor, determine the first current threshold and the second current threshold according to the current fast charging capability. S204. When the real-time sampling current is continuously greater than the first current threshold during the first preset time period, or when the real-time sampling current is continuously greater than the second current threshold during the second preset time period, the overcurrent fault determination result is determined to be an overcurrent fault, and step S207 is executed. S205. When the real-time sampling current is greater than the upper limit of the effective value of the current sensor, if the real-time sampling current continues to be greater than the second current threshold within the third preset time period. S206. If the change in the total voltage of the battery pack exceeds the preset voltage change threshold within the fourth preset time period, or the highest voltage of a single cell is greater than the preset full charge voltage, the overcurrent fault determination result is determined to be an overcurrent fault, and step S207 is executed. S207. Implement appropriate overcurrent protection control for the power battery.

[0058] For example, Figure 3 A schematic flowchart illustrating an example of a fast-charging overcurrent protection method for power batteries is shown.

[0059] Figure 4 The diagram shows a structural schematic of a fast-charging overcurrent protection device for a power battery. It should be understood that this device is related to... Figure 1 The method executed in the middle corresponds to the steps involved in the aforementioned method. The specific functions and effects of the device can be found in the description above. To avoid repetition, detailed descriptions are omitted here.

[0060] The fast-charging overcurrent protection device for the power battery includes: The acquisition unit 310 is used to acquire the battery state parameters of the power battery during fast charging. The determining unit 320 is used to determine the current fast charging capability of the power battery based on the battery state parameters; The overcurrent detection unit 330 is used to perform overcurrent detection based on battery status parameters, current fast charging capability and preset upper limit of current sensor effective value, and obtain overcurrent fault judgment result; The overcurrent protection unit 340 is used to perform corresponding overcurrent protection control on the power battery when it is determined that there is an overcurrent fault in the power battery based on the overcurrent fault judgment result.

[0061] In some embodiments, battery status parameters include at least the real-time sampled current detected by the current sensor, the maximum single-cell capacity, the minimum single-cell capacity, the highest module temperature, the lowest module temperature, the total battery pack voltage, and the highest single-cell voltage.

[0062] In some embodiments, the determining unit 320 is specifically used to look up a table based on the maximum single cell capacity, the minimum single cell capacity, the highest module temperature, and the lowest module temperature to determine the current fast charging capability of the power battery. The current fast charging capability includes the maximum allowable charging current of the power battery under the current condition.

[0063] In some embodiments, the overcurrent detection unit 330 is specifically used to determine a first current threshold and a second current threshold based on the current fast charging capability when the real-time sampled current is not greater than the preset upper limit of the effective value of the current sensor. The overcurrent detection unit 330 is specifically used to determine that when the real-time sampling current is continuously greater than the first current threshold during the first preset time period, or when the real-time sampling current is continuously greater than the second current threshold during the second preset time period, the overcurrent fault determination result is that there is an overcurrent fault, and trigger the overcurrent protection unit 340 to perform corresponding overcurrent protection control on the power battery. The first current threshold is calculated based on the current fast charging capability, the first preset proportional coefficient, and the first offset value; the second current threshold is calculated based on the current fast charging capability, the second preset proportional coefficient, and the second offset value; the second preset proportional coefficient is greater than the first preset proportional coefficient, and the second offset value is greater than the first offset value.

[0064] In some embodiments, the overcurrent detection unit 330 is further configured to perform overcurrent detection based on the total voltage of the battery pack and the highest voltage of the individual cells when the real-time sampled current is greater than the upper limit of the effective value of the current sensor, and if the real-time sampled current continues to be greater than the second current threshold within a third preset time period, and obtain an overcurrent fault determination result.

[0065] In some embodiments, the overcurrent detection unit 330 is further configured to determine that an overcurrent fault exists if the change in the total voltage of the battery pack exceeds a preset voltage change threshold or the highest voltage of a single cell is greater than a pre-calibrated full charge voltage within a fourth preset time period, and to trigger the overcurrent protection unit 340 to perform corresponding overcurrent protection control on the power battery.

[0066] like Figure 5 As shown, this application provides an electronic device 400, which includes a processor 401 and a memory 402. The processor 401 and the memory 402 are interconnected and communicate with each other through a communication bus 403 and / or other forms of connection mechanism (not shown). The memory 402 stores a computer program that can be executed by the processor 401. When the computing device is running, the processor 401 executes the computer program to perform the method in any of the aforementioned optional implementations.

[0067] This application provides a computer-readable storage medium storing a computer program, which, when executed by a processor, performs the method in any of the aforementioned optional implementations.

[0068] The computer-readable storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read Only Memory (EPROM), Programmable Red-Only Memory (PROM), Read-Only Memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

[0069] This application provides a computer program product, which includes a computer program that, when run by a processor, executes the method in any of the aforementioned optional implementations.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A power battery fast charging overcurrent protection method, characterized in that, The method comprises: obtaining a battery state parameter of a power battery during fast charging; determining a current fast charging capability of the power battery according to the battery state parameter; performing overcurrent detection according to the battery state parameter, the current fast charging capability and a preset upper limit of a current sensor effective value to obtain an overcurrent fault determination result; when it is determined that the power battery has an overcurrent fault according to the overcurrent fault determination result, performing corresponding overcurrent protection control on the power battery.

2. The power battery fast charging overcurrent protection method according to claim 1, characterized in that, The battery state parameter at least includes a real-time sampling current detected by a current sensor, a maximum single cell electric quantity, a minimum single cell electric quantity, a highest module temperature, a lowest module temperature, a total voltage of a battery pack and a highest single cell voltage.

3. The power cell fast charge overcurrent protection method of claim 2, wherein, The determination of the current fast charging capability of the power battery according to the battery state parameter comprises: performing table lookup according to the maximum single cell electric quantity, the minimum single cell electric quantity, the highest module temperature and the lowest module temperature to determine the current fast charging capability of the power battery; wherein the current fast charging capability includes a maximum allowable charging current of the power battery in the current state.

4. The power battery fast charging overcurrent protection method according to claim 2, characterized in that, The overcurrent detection according to the battery state parameter, the current fast charging capability and the preset upper limit of the current sensor effective value to obtain the overcurrent fault determination result comprises: when the real-time sampling current is not greater than the preset upper limit of the current sensor effective value, determining a first current threshold and a second current threshold according to the current fast charging capability; when the real-time sampling current continuously exceeds the first current threshold within a first preset time period or continuously exceeds the second current threshold within a second preset time period, determining that the overcurrent fault determination result is an overcurrent fault, and performing the corresponding overcurrent protection control on the power battery; wherein the first current threshold is calculated according to the current fast charging capability, a first preset proportion coefficient and a first offset value; the second current threshold is calculated according to the current fast charging capability, a second preset proportion coefficient and a second offset value; the second preset proportion coefficient is greater than the first preset proportion coefficient, and the second offset value is greater than the first offset value.

5. The power cell fast charge overcurrent protection method of claim 4, wherein, The method further comprises: when the real-time sampling current is greater than the upper limit of the current sensor effective value, if the real-time sampling current continuously exceeds the second current threshold within a third preset time period, performing overcurrent detection according to the total voltage of the battery pack and the highest single cell voltage to obtain the overcurrent fault determination result.

6. The power cell fast charge overcurrent protection method of claim 5, wherein, The overcurrent detection according to the total voltage of the battery pack and the highest single cell voltage to obtain the overcurrent fault determination result comprises: if a variation of the total voltage of the battery pack exceeds a preset voltage variation threshold within a fourth preset time period or the highest single cell voltage is greater than a preset full charging voltage, it is determined that the overcurrent fault determination result is an overcurrent fault, and the corresponding overcurrent protection control on the power battery is performed.

7. A power battery fast charging overcurrent protection device, characterized in that, The power battery fast charging overcurrent protection device comprises: an obtaining unit configured to obtain a battery state parameter of a power battery during fast charging; a determining unit configured to determine a current fast charging capability of the power battery according to the battery state parameter; An overcurrent detection unit is configured to perform overcurrent detection according to the battery state parameter, the current fast charging capability, and a preset upper limit of an effective value of a current sensor, to obtain an overcurrent fault determination result. An overcurrent protection unit is configured to perform corresponding overcurrent protection control on the power battery when it is determined that the power battery has an overcurrent fault according to the overcurrent fault determination result.

8. An electronic device, comprising: The electronic device includes a memory and a processor, the memory is used to store a computer program, and the processor runs the computer program to make the electronic device execute the power battery fast charging overcurrent protection method in any one of claims 1 to 6.

9. A readable storage medium, characterized by, The readable storage medium stores a computer program, and the computer program is run by the processor to execute the power battery fast charging overcurrent protection method in any one of claims 1 to 6.

10. A computer program product, characterised in that, The computer program product includes a computer program, and the computer program is run by the processor to execute the power battery fast charging overcurrent protection method in any one of claims 1 to 6.

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