Power battery current monitoring method, device, equipment and medium

Abstract

The invention discloses a power battery current monitoring method, device and equipment and a medium, and the method comprises the steps: collecting the original current corresponding to each high-voltage accessory connected with a power battery in a vehicle according to a preset frequency when the vehicle is in a high-voltage state; according to the original current corresponding to each high-voltage accessory, determining accessory current corresponding to each high-voltage accessory at the target moment; taking the sum of the accessory current corresponding to each high-voltage accessory at the target moment as a first total current corresponding to the power battery at the target moment; acquiring a second total current corresponding to the power battery at the target moment from a current sensor connected with the power battery; and according to the validity corresponding to the first total current and the second total current and the current difference value between the first total current and the second total current, determining the actual total current corresponding to the power battery at the target moment. According to the invention, the current safety of the power battery is monitored, and the current monitoring cost of the power battery is reduced.

Description

Technical Field

[0001] The present invention relates to the field of automobile safety technology, and in particular to a power battery current monitoring method, device, equipment and medium. Background Art

[0002] New energy vehicles refer to vehicles that use unconventional automotive fuels as their power source. As the core component of new energy vehicles, the safety of power batteries is crucial to the entire vehicle. Safety monitoring of power batteries mainly includes safety monitoring of their current functions. The relevant technology mainly uses two current sensors. Generally, the first current sensor is a digital shunt, and the second current sensor is an analog Hall current sensor. The analog Hall current sensor is connected to the battery management system and samples are taken through the battery management system. However, the cost of this solution is relatively high. Therefore, how to reduce the current monitoring cost of power batteries is an urgent problem to be solved. Summary of the invention

[0003] The embodiments of the present application provide a power battery current monitoring method, device, equipment and medium, thereby solving the technical problem that the safety monitoring of power batteries in the prior art is mainly implemented by using two current sensors, but the cost of this solution is relatively high, and achieves the technical effect of reducing the current monitoring cost of power batteries.

[0004] In a first aspect, the present application provides a power battery current monitoring method, the method comprising:

[0005] When the vehicle is in an upper high voltage state, collecting the original current corresponding to each high voltage accessory connected to the power battery in the vehicle according to a preset frequency;

[0006] Each moment corresponding to the preset frequency during the time period when the vehicle is in the upper high-voltage state is sequentially used as a target moment, and the following steps are sequentially performed for each target moment:

[0007] Determine, according to the original currents respectively corresponding to the high-voltage accessories, the accessory currents respectively corresponding to the high-voltage accessories at the target time;

[0008] Taking the sum of the accessory currents corresponding to the various high-voltage accessories at the target time as the first total current corresponding to the power battery at the target time;

[0009] collecting a second total current of the power battery corresponding to the target time from a current sensor connected to the power battery;

[0010] An actual total current corresponding to the power battery at the target time is determined according to respective corresponding validity of the first total current and the second total current and a current difference between the first total current and the second total current.

[0011] Further, the determining, based on the original currents corresponding to the high-voltage accessories, the accessory currents corresponding to the high-voltage accessories at the target time, includes:

[0012] Determine the peak current and the trough current of the three original currents respectively corresponding to each of the high-voltage accessories according to the change trends over time of the three original currents collected by each of the high-voltage accessories at the target time and the last time and the last time closest to the target time;

[0013] When the original current corresponding to at least one first target high-voltage accessory among the high-voltage accessories at the target time is the peak current, the original current corresponding to the first target high-voltage accessory at the target time is used as the accessory current corresponding to the first target high-voltage accessory at the target time, and the peak currents corresponding to the first other high-voltage accessories except the first target high-voltage accessory are used as the accessory current corresponding to each of the first other high-voltage accessories at the target time;

[0014] When the original current corresponding to at least one second target high-voltage accessory among the high-voltage accessories at the target time is the valley current, the original current corresponding to the second target high-voltage accessory at the target time is used as the accessory current corresponding to the second target high-voltage accessory at the target time, and the valley currents corresponding to the second other high-voltage accessories except the second target high-voltage accessory are used as the accessory current corresponding to each of the second other high-voltage accessories at the target time;

[0015] When the original current corresponding to each of the high-voltage accessories at the target time is not the peak current or the valley current, the original current corresponding to each of the high-voltage accessories at the target time is used as the accessory current corresponding to each of the high-voltage accessories at the target time.

[0016] Furthermore, each of the high-voltage accessories connected to the power battery in the vehicle includes at least the front electric drive, rear electric drive, on-board charger and heater of the vehicle.

[0017] Further, the determining, based on the original currents corresponding to the high-voltage accessories, the accessory currents corresponding to the high-voltage accessories at the target time, includes:

[0018] Determine the original currents of the onboard charger and the heater of the vehicle respectively corresponding to the target time as the accessory currents of the onboard charger and the heater respectively corresponding to the target time;

[0019] Determine the peak current and the valley current of the three original currents respectively corresponding to the front electric drive and the rear electric drive according to the change trends over time of the three original currents collected at the target moment and the last moment and the last moment closest to the target moment of the front electric drive and the rear electric drive of the vehicle;

[0020] When the original current corresponding to at least one of the first target high-voltage accessories of the front electric drive and the rear electric drive at the target time is the peak current, the original current corresponding to the first target high-voltage accessory at the target time is used as the accessory current corresponding to the first target high-voltage accessory at the target time, and the peak currents corresponding to the first other high-voltage accessories except the first target high-voltage accessory are used as the accessory currents corresponding to each of the first other high-voltage accessories at the target time;

[0021] When the original current corresponding to at least one of the second target high-voltage accessories of the front electric drive and the rear electric drive at the target time is the valley current, the original current corresponding to the second target high-voltage accessory at the target time is used as the accessory current corresponding to the second target high-voltage accessory at the target time, and the valley currents corresponding to the second other high-voltage accessories except the second target high-voltage accessory are used as the accessory currents corresponding to the second other high-voltage accessories at the target time;

[0022] When the original currents corresponding to the front electric drive and the rear electric drive at the target time are neither the peak current nor the valley current, the original currents corresponding to the front electric drive and the rear electric drive at the target time are respectively used as the accessory currents corresponding to the front electric drive and the rear electric drive at the target time.

[0023] Further, determining the actual total current corresponding to the power battery at the target time according to the respective validity of the first total current and the second total current and the current difference between the first total current and the second total current includes:

[0024] In a case where both the first total current and the second total current are valid, determining the current difference between the first total current and the second total current;

[0025] When the absolute value of the current difference is less than a preset current value, determining the second total current as the actual total current of the power battery corresponding to the target time;

[0026] When the absolute value of the current difference is greater than or equal to the preset current value, it is determined that neither the first total current nor the second total current is the actual total current corresponding to the power battery at the target time, and the output power of the power battery is controlled to be reduced to a first preset power.

[0027] Further, determining the actual total current corresponding to the power battery at the target time according to the respective validity of the first total current and the second total current and the current difference between the first total current and the second total current includes:

[0028] When the first total current is valid and the second total current is invalid, determining the first total current as the actual total current of the power battery at the target time, and controlling the output power of the power battery to decrease to a second preset power;

[0029] When the first total current is invalid and the second total current is valid, determining the second total current as the actual total current of the power battery at the target time, and controlling the output power of the power battery to decrease to a third preset power;

[0030] In the case that both the first total current and the second total current are invalid, it is determined that neither the first total current nor the second total current is an actual total current corresponding to the power battery at the target time.

[0031] Furthermore, before determining the accessory current corresponding to each of the high-voltage accessories at the target time according to the original current corresponding to each of the high-voltage accessories, the method further includes:

[0032] The original current corresponding to each of the high-voltage accessories at the target time is filtered and cyclic redundancy checked.

[0033] In a second aspect, the present application provides a power battery current monitoring device, the device comprising:

[0034] A high-voltage accessory current acquisition module is used to acquire the original current corresponding to each high-voltage accessory connected to the power battery in the vehicle according to a preset frequency when the vehicle is in an upper high-voltage state;

[0035] A circulation module is used to sequentially take each moment corresponding to the preset frequency during the time period when the vehicle is in the upper high-voltage state as a target moment, and sequentially perform the following steps for each target moment:

[0036] Determine, according to the original currents respectively corresponding to the high-voltage accessories, the accessory currents respectively corresponding to the high-voltage accessories at the target time;

[0037] Taking the sum of the accessory currents corresponding to the various high-voltage accessories at the target time as the first total current corresponding to the power battery at the target time;

[0038] collecting a second total current of the power battery corresponding to the target time from a current sensor connected to the power battery;

[0039] An actual total current corresponding to the power battery at the target time is determined according to respective corresponding validity of the first total current and the second total current and a current difference between the first total current and the second total current.

[0040] Furthermore, the loop module is used to:

[0041] Determine the peak current and the trough current of the three original currents respectively corresponding to each of the high-voltage accessories according to the change trends over time of the three original currents collected by each of the high-voltage accessories at the target time and the last time and the last time closest to the target time;

[0042] When the original current corresponding to at least one first target high-voltage accessory among the high-voltage accessories at the target time is the peak current, the original current corresponding to the first target high-voltage accessory at the target time is used as the accessory current corresponding to the first target high-voltage accessory at the target time, and the peak currents corresponding to the first other high-voltage accessories except the first target high-voltage accessory are used as the accessory current corresponding to each of the first other high-voltage accessories at the target time;

[0043] When the original current corresponding to at least one second target high-voltage accessory among the high-voltage accessories at the target time is the valley current, the original current corresponding to the second target high-voltage accessory at the target time is used as the accessory current corresponding to the second target high-voltage accessory at the target time, and the valley currents corresponding to the second other high-voltage accessories except the second target high-voltage accessory are used as the accessory current corresponding to each of the second other high-voltage accessories at the target time;

[0044] When the original current corresponding to each of the high-voltage accessories at the target time is not the peak current or the valley current, the original current corresponding to each of the high-voltage accessories at the target time is used as the accessory current corresponding to each of the high-voltage accessories at the target time.

[0045] Furthermore, each of the high-voltage accessories connected to the power battery in the vehicle includes at least the front electric drive, rear electric drive, on-board charger and heater of the vehicle.

[0046] Furthermore, the loop module is used to:

[0047] Determine the original currents of the onboard charger and the heater of the vehicle respectively corresponding to the target time as the accessory currents of the onboard charger and the heater respectively corresponding to the target time;

[0048] Determine the peak current and the valley current of the three original currents respectively corresponding to the front electric drive and the rear electric drive according to the change trends over time of the three original currents collected at the target moment and the last moment and the last moment closest to the target moment of the front electric drive and the rear electric drive of the vehicle;

[0049] When the original current corresponding to at least one of the first target high-voltage accessories of the front electric drive and the rear electric drive at the target time is the peak current, the original current corresponding to the first target high-voltage accessory at the target time is used as the accessory current corresponding to the first target high-voltage accessory at the target time, and the peak currents corresponding to the first other high-voltage accessories except the first target high-voltage accessory are used as the accessory currents corresponding to each of the first other high-voltage accessories at the target time;

[0050] When the original current corresponding to at least one of the second target high-voltage accessories of the front electric drive and the rear electric drive at the target time is the valley current, the original current corresponding to the second target high-voltage accessory at the target time is used as the accessory current corresponding to the second target high-voltage accessory at the target time, and the valley currents corresponding to the second other high-voltage accessories except the second target high-voltage accessory are used as the accessory currents corresponding to the second other high-voltage accessories at the target time;

[0051] When the original currents corresponding to the front electric drive and the rear electric drive at the target time are neither the peak current nor the valley current, the original currents corresponding to the front electric drive and the rear electric drive at the target time are respectively used as the accessory currents corresponding to the front electric drive and the rear electric drive at the target time.

[0052] Furthermore, the loop module is used to:

[0053] In a case where both the first total current and the second total current are valid, determining the current difference between the first total current and the second total current;

[0054] When the absolute value of the current difference is less than a preset current value, determining the second total current as the actual total current of the power battery corresponding to the target time;

[0055] When the absolute value of the current difference is greater than or equal to the preset current value, it is determined that neither the first total current nor the second total current is the actual total current corresponding to the power battery at the target time, and the output power of the power battery is controlled to be reduced to a first preset power.

[0056] Furthermore, the loop module is used to:

[0057] When the first total current is valid and the second total current is invalid, determining the first total current as the actual total current of the power battery at the target time, and controlling the output power of the power battery to decrease to a second preset power;

[0058] When the first total current is invalid and the second total current is valid, determining the second total current as the actual total current of the power battery at the target time, and controlling the output power of the power battery to decrease to a third preset power;

[0059] In the case that both the first total current and the second total current are invalid, it is determined that neither the first total current nor the second total current is an actual total current corresponding to the power battery at the target time.

[0060] Furthermore, the current preprocessing module is used to:

[0061] Before determining the accessory current corresponding to each of the high-voltage accessories at the target time based on the original current corresponding to each of the high-voltage accessories, filtering and cyclic redundancy check are performed on the original current corresponding to each of the high-voltage accessories at the target time.

[0062] In a third aspect, the present application provides an electronic device, including:

[0063] processor;

[0064] a memory for storing instructions executable by the processor;

[0065] Wherein, the processor is configured to execute to implement a power battery current monitoring method provided in the first aspect.

[0066] In a fourth aspect, the present application provides a non-temporary computer-readable storage medium. When the instructions in the storage medium are executed by a processor of an electronic device, the electronic device is enabled to implement a power battery current monitoring method as provided in the first aspect.

[0067] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0068] In the embodiment of the present application, when the vehicle is in the upper high voltage state, the original current corresponding to each high voltage accessory connected to the power battery in the vehicle is collected according to the preset frequency; for each target moment corresponding to the preset frequency during the time period when the vehicle is in the upper high voltage state, the accessory current corresponding to each high voltage accessory at the target moment is determined according to the original current corresponding to each high voltage accessory; the sum of the accessory currents corresponding to each high voltage accessory at the target moment is used as the first total current corresponding to the power battery at the target moment; the second total current corresponding to the power battery at the target moment is collected from the current sensor connected to the power battery; the actual total current corresponding to the power battery at the target moment is determined according to the validity corresponding to each of the first total current and the second total current and the current difference between the first total current and the second total current. It can be seen that the embodiment of the present application can cancel the analog Hall current sensor used in the related art, and instead use the sum of the accessory currents of each high voltage accessory and a current sensor (such as a digital shunt) to monitor the current safety of the power battery, cancel the analog Hall current sensor and do not need to add other sensors or devices, which reduces the current monitoring cost of the power battery on the basis of realizing the monitoring of the current safety of the power battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0070] Figure 1 A schematic diagram of a flow chart of a power battery current monitoring method provided in an embodiment of the present application;

[0071] Figure 2 A schematic diagram of a power battery current monitoring architecture provided in an embodiment of the present application;

[0072] Figure 3 A schematic diagram of the structure of a power battery current monitoring device provided in an embodiment of the present application;

[0073] Figure 4 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0074] The embodiment of the present application provides a power battery current monitoring method, which solves the technical problem that the safety monitoring of the power battery in the prior art is mainly implemented by using two current sensors, but the cost of this solution is relatively high.

[0075] The technical solution of the embodiment of the present application is to solve the above technical problems, and the overall idea is as follows:

[0076] In the embodiment of the present application, when the vehicle is in the upper high voltage state, the original current corresponding to each high voltage accessory connected to the power battery in the vehicle is collected according to the preset frequency; for each target moment corresponding to the preset frequency during the time period when the vehicle is in the upper high voltage state, the accessory current corresponding to each high voltage accessory at the target moment is determined according to the original current corresponding to each high voltage accessory; the sum of the accessory currents corresponding to each high voltage accessory at the target moment is used as the first total current corresponding to the power battery at the target moment; the second total current corresponding to the power battery at the target moment is collected from the current sensor connected to the power battery; the actual total current corresponding to the power battery at the target moment is determined according to the validity corresponding to each of the first total current and the second total current and the current difference between the first total current and the second total current. It can be seen that the embodiment of the present application can cancel the analog Hall current sensor used in the related art, and instead use the sum of the accessory currents of each high voltage accessory and a current sensor (such as a digital shunt) to monitor the current safety of the power battery, cancel the analog Hall current sensor and do not need to add other sensors or devices, which reduces the current monitoring cost of the power battery on the basis of realizing the monitoring of the current safety of the power battery.

[0077] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0078] First of all, the term "and / or" in this article is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0079] The present application provides a method for monitoring the current of a power battery. Figure 1 As shown, the method includes step S11-step S12. A power battery current monitoring method provided in the embodiment of the present application can be executed by a relevant controller of the power battery, and the specific method can be selected according to the actual situation, and the embodiment of the present application does not limit this.

[0080] Step S11, when the vehicle is in an upper high voltage state, collecting the original current corresponding to each high voltage accessory connected to the power battery in the vehicle at a preset frequency;

[0081] Step S12, taking each moment corresponding to the preset frequency during the time period when the vehicle is in the upper high-voltage state as a target moment, and performing the following steps in sequence for each target moment:

[0082] Step S121, determining the accessory current corresponding to each of the high-voltage accessories at the target time according to the original current corresponding to each of the high-voltage accessories;

[0083] Step S122, taking the sum of the accessory currents corresponding to the various high-voltage accessories at the target time as the first total current corresponding to the power battery at the target time;

[0084] Step S123, collecting a second total current of the power battery corresponding to the target time from a current sensor connected to the power battery;

[0085] Step S124: determining an actual total current of the power battery at the target time according to respective validity of the first total current and the second total current and a current difference between the first total current and the second total current.

[0086] Regarding step S11, when the vehicle is in the upper high voltage state, the original current corresponding to each high voltage accessory connected to the power battery in the vehicle is collected at a preset frequency.

[0087] After the vehicle receives the upper high voltage signal generated by the user trigger, the vehicle enters the upper high voltage state.

[0088] For all types of vehicles, the various high-voltage accessories connected to the power battery in the vehicle include at least the front electric drive, rear electric drive, on-board charger and heater of the vehicle. Among them, the front electric drive in the embodiment of the present application refers to the front motor, and the rear electric drive refers to the rear motor. For relatively special types of vehicles, the various high-voltage accessories connected to the power battery in the vehicle may include other types of high-voltage accessories in addition to the front electric drive, rear electric drive, on-board charger and heater. For example, the high-voltage accessories in a hybrid car also include a generator. Therefore, the high-voltage accessories mentioned in the embodiment of the present application can be adjusted according to the different types of specific vehicles. The embodiment of the present application only takes a vehicle including only high-voltage accessories such as the front electric drive, rear electric drive, on-board charger and heater as an example for subsequent explanation.

[0089] When the vehicle is in the upper high voltage state, the original currents corresponding to the high voltage accessories connected to the power battery in the vehicle are collected at a preset frequency. The preset frequency can be set according to actual conditions, for example, the preset frequency can be set to a frequency less than 10ms, for example, when the preset frequency is 5ms, the original currents corresponding to the high voltage accessories connected to the power battery in the vehicle are collected every 5ms.

[0090] Regarding step S12, each moment corresponding to the preset frequency during the time period when the vehicle is in the upper high-voltage state is taken as a target moment in turn, and the following steps S121 to S124 are performed in turn for each target moment.

[0091] After collecting the original current corresponding to each high-voltage accessory connected to the power battery in the vehicle according to the preset frequency, the target time is determined in sequence according to the preset frequency, and steps S121 to S124 are executed in sequence for each target time until the vehicle receives the lower high-voltage signal. In other words, during the entire process of the vehicle being in the upper high-voltage state, the time phase is divided according to the preset frequency, and the time corresponding to each division is used as the target time in sequence and steps S121 to S124 are executed until the vehicle receives the lower high-voltage signal.

[0092] After acquiring the original signal, the original current corresponding to each high-voltage accessory at the target time can be filtered and cyclic redundancy checked. The accuracy of the filtering process can be set according to actual conditions, for example, the accuracy can be retained to 0.01A.

[0093] In addition, the validity of the original current corresponding to each of the high-voltage accessories at the target time can also be determined according to the cyclic redundancy check results of the original current corresponding to each of the high-voltage accessories at the target time. In actual operation, the validity can be represented by a validity flag, such as 0 for valid and 1 for invalid.

[0094] Regarding step S121, the accessory current corresponding to each of the high-voltage accessories at the target time is determined according to the original current corresponding to each of the high-voltage accessories.

[0095] Among the various high-voltage accessories connected to the power battery, the current corresponding to the front electric drive and the rear electric drive is relatively large, and the current fluctuation is large, while the current corresponding to other high-voltage accessories such as the on-board charger and the heater is relatively small, and the current fluctuation is small. In view of this actual situation, the embodiment of the present application provides two different ways to implement step S121.

[0096] Method 1 includes steps S12111 to S12114. Method 1 does not distinguish between the current sizes and current fluctuation characteristics of each high-voltage accessory. Instead, it synchronizes the data of each original current according to the current fluctuation characteristics of each high-voltage accessory, aligns the time deviation of the original current of each high-voltage accessory, and then determines the accessory current corresponding to each high-voltage accessory at the target time.

[0097] Method 2 includes steps S12121 to S12125. Different from method 1, method 2 distinguishes the current size and current fluctuation characteristics of each high-voltage accessory. For the front electric drive and rear electric drive with large current and large fluctuation, the original current of the front electric drive and rear electric drive is synchronized, and the original current of the front electric drive and rear electric drive is aligned with the time deviation. For other high-voltage accessories such as on-board chargers and heaters with small current and small fluctuation, the corresponding original current is directly used as the accessory current of the high-voltage accessory.

[0098] [Method 1] includes steps S12111 to S12114.

[0099] Step S12111, determining the peak current and the trough current of the three original currents respectively corresponding to each of the high-voltage accessories according to the change trends over time of the three original currents collected by each of the high-voltage accessories at the target time and the last time closest to the target time and the last time;

[0100] Step S12112, when the original current corresponding to at least one first target high-voltage accessory among the high-voltage accessories at the target time is the peak current, the original current corresponding to the first target high-voltage accessory at the target time is used as the accessory current corresponding to the first target high-voltage accessory at the target time, and the peak currents corresponding to the first other high-voltage accessories except the first target high-voltage accessory are used as the accessory currents corresponding to the first other high-voltage accessories at the target time;

[0101] Step S12113, when the original current corresponding to at least one second target high-voltage accessory among the high-voltage accessories at the target time is the valley current, the original current corresponding to the second target high-voltage accessory at the target time is used as the accessory current corresponding to the second target high-voltage accessory at the target time, and the valley currents corresponding to the second other high-voltage accessories except the second target high-voltage accessory are used as the accessory current corresponding to each of the second other high-voltage accessories at the target time;

[0102] Step S12114, when the original current corresponding to each of the high-voltage accessories at the target time is not the peak current or the valley current, the original current corresponding to each of the high-voltage accessories at the target time is used as the accessory current corresponding to each of the high-voltage accessories at the target time.

[0103] For each high-voltage accessory, based on the relationship between the size of the three most recently collected original currents corresponding to the target moment (including the original currents collected at the target moment, the previous moment, and the previous moment), determine the peaks and troughs of the currents in the time period corresponding to the three original currents, and record the original current corresponding to the peak as the peak current. Similarly, record the original current corresponding to the trough as the trough current. Among them, the previous moment is the most recent collection moment corresponding to the target moment, and the previous moment is the most recent collection moment corresponding to the previous moment. For example, if the preset frequency is 5ms and the target moment is the current moment, then the previous moment is the moment 5ms back from the current moment, and the previous moment is the moment 10ms back from the current moment.

[0104] The target time is the current time, and the original current of each high-voltage accessory at the target time may be a peak current, a valley current, or the original current is neither a peak current nor a valley current. Taking the target time as the benchmark, when the original current corresponding to a certain high-voltage accessory at the target time is a peak current, the target time and the original current of the high-voltage accessory are used as the benchmark, and the original current of the high-voltage accessory at the target time is used as the accessory current of the high-voltage accessory. At the same time, the peak currents of other high-voltage accessories are aligned with it, that is, the peak currents of other high-voltage accessories are adjusted to the accessory currents corresponding to each at the target time.

[0105] Similarly, taking the target time as a reference, when the original current corresponding to a certain high-voltage accessory at the target time is a valley current, the target time and original current of the high-voltage accessory are used as a reference, and the original current of the high-voltage accessory at the target time is used as the accessory current of the high-voltage accessory. At the same time, the valley currents of other high-voltage accessories are aligned therewith, that is, the valley currents of other high-voltage accessories are adjusted to their corresponding accessory currents at the target time.

[0106] When the original current corresponding to each of the high-voltage accessories at the target time is not the peak current or the valley current, the original current corresponding to each of the high-voltage accessories at the target time can be used as the accessory current corresponding to each of the high-voltage accessories at the target time.

[0107] [Method 2] includes steps S12121 to S12125.

[0108] Step S12121, determining the original currents of the onboard charger and the heater of the vehicle at the target time as the accessory currents of the onboard charger and the heater at the target time;

[0109] Step S12122, determining the peak current and the valley current of the three original currents respectively corresponding to the front electric drive and the rear electric drive according to the change trends over time of the three original currents collected by the front electric drive and the rear electric drive of the vehicle at the target moment and the last moment closest to the target moment and the last moment before the target moment;

[0110] Step S12123, when the original current corresponding to at least one of the first target high-voltage accessories of the front electric drive and the rear electric drive at the target time is the peak current, the original current corresponding to the first target high-voltage accessory at the target time is used as the accessory current corresponding to the first target high-voltage accessory at the target time, and the peak currents corresponding to the first other high-voltage accessories except the first target high-voltage accessory are used as the accessory currents corresponding to each of the first other high-voltage accessories at the target time;

[0111] Step S12124, when the original current corresponding to at least one of the second target high-voltage accessories in the front electric drive and the rear electric drive at the target time is the valley current, the original current corresponding to the second target high-voltage accessory at the target time is used as the accessory current corresponding to the second target high-voltage accessory at the target time, and the valley currents corresponding to the second other high-voltage accessories except the second target high-voltage accessory are used as the accessory currents corresponding to the second other high-voltage accessories at the target time;

[0112] Step S12125, when the original currents corresponding to the front electric drive and the rear electric drive at the target time are neither the peak current nor the valley current, the original currents corresponding to the front electric drive and the rear electric drive at the target time are respectively used as the accessory currents corresponding to the front electric drive and the rear electric drive at the target time.

[0113] The principle of determining the peak current of the front electric drive and the rear electric drive at the peak moment and the valley current at the valley moment in the second method is the same as that of the first method, and will not be repeated here.

[0114] The difference between method 2 and method 1 is that method 2 directly uses the original current of the on-board charger and the heater at the target time as the accessory current of the on-board charger and the heater at the target time, which ignores the current fluctuation characteristics of the on-board charger and the heater.

[0115] Comparing the method 1 with the method 2, the accuracy of the accessory current of each high-voltage accessory determined by the method 1 is higher, while the efficiency of the accessory current of each high-voltage accessory determined by the method 2 is higher. In the actual operation process, according to the actual requirements for accuracy and efficiency, a suitable method can be selected from the method 1 or the method 2 to determine the accessory current of each high-voltage accessory, and the embodiment of the present application does not limit this.

[0116] Regarding step S122, the sum of the accessory currents corresponding to the various high-voltage accessories at the target time is taken as the first total current corresponding to the power battery at the target time.

[0117] The accessory currents corresponding to the various high-voltage accessories at the target time are added together, and the sum is used as the first total current corresponding to the power battery at the target time. The first total current is equivalent to the sum of the currents provided by the power battery to the various high-voltage accessories at the target time.

[0118] As mentioned above, the embodiment of the present application determines the validity of the original current corresponding to each of the high-voltage accessories at the target time according to the cyclic redundancy check results of the original current corresponding to each of the high-voltage accessories at the target time. Further, the validity of the first total current can be determined according to the validity of the accessory current corresponding to each of the high-voltage accessories at the target time.

[0119] If the accessory currents corresponding to the high-voltage accessories at the target time are all valid, the first total current is considered to be valid. If at least one of the accessory currents corresponding to the high-voltage accessories at the target time is invalid, the first total current is considered to be invalid.

[0120] Regarding step S123, a second total current of the power battery corresponding to the target time is collected from a current sensor connected to the power battery.

[0121] Step S123 may be performed simultaneously with step S11, or step S123 may be performed simultaneously with step S121 to step S122. The current sensor in the embodiment of the present application may be a digital shunt.

[0122] The second total current is the sum of the currents that the power battery supplies to various high-voltage accessories. When the power battery is operating normally, the current difference between the first total current and the second total current should be within a reasonable range. If the current difference between the first total current and the second total current is not within a reasonable range, it means that the power battery is operating abnormally, or the first total current detection is incorrect, or the second total current detection is incorrect.

[0123] In order to determine whether the power battery has an abnormality at the target time, and to determine the actual total current of the power battery at the target time, step S124 is continued to be executed.

[0124] Regarding step S124, the actual total current corresponding to the power battery at the target time is determined according to the respective corresponding validity of the first total current and the second total current and the current difference between the first total current and the second total current.

[0125] The validity corresponding to each of the first total current and the second total current can be determined according to the validity flag bits corresponding to each of them.

[0126] When both the first total current and the second total current are valid, step S12411 to step S12413 may be continued.

[0127] Step S12411, determining the current difference between the first total current and the second total current;

[0128] Step S12412, when the absolute value of the current difference is less than a preset current value, determining the second total current as the actual total current of the power battery corresponding to the target time;

[0129] Step S12413, when the absolute value of the current difference is greater than or equal to the preset current value, determine that neither the first total current nor the second total current is the actual total current corresponding to the power battery at the target time, and control the output power of the power battery to be reduced to a first preset power.

[0130] The preset current value is used to judge whether the current difference between the first total current and the second total current is within a reasonable range, and can be determined according to actual needs. For example, when the accuracy requirement is high, the preset current value can be set to be smaller.

[0131] When the first total current and the second total current are both valid, the current difference between the first total current and the second total current is calculated. If the absolute value of the difference between the two is less than the preset current value, it confirms that the first total current and the second total current are normal. The first total current or the second total current can be determined as the actual total current of the power battery at the target time.

[0132] If the absolute value of the difference between the two is greater than or equal to the preset current value, it is confirmed that at least one of the first total current and the second total current is abnormal, then the first total current and the second total current are not the actual total current of the power battery at the target time. At this time, in order to improve vehicle safety, the output power of the power battery can be controlled to be reduced to the first preset power. The first preset power can be 60-90%, for example, 80%.

[0133] In the case that at least one of the first total current and the second total current is invalid, steps S12421 to S12423 may continue to be executed.

[0134] Step S12421: when the first total current is valid and the second total current is invalid, determining the first total current as the actual total current of the power battery at the target time, and controlling the output power of the power battery to decrease to a second preset power;

[0135] Step S12422, when the first total current is invalid and the second total current is valid, determining the second total current as the actual total current of the power battery at the target time, and controlling the output power of the power battery to decrease to a third preset power;

[0136] Step S12423: When both the first total current and the second total current are invalid, determine that neither the first total current nor the second total current is an actual total current corresponding to the power battery at the target time.

[0137] When only one of the first total current and the second total current is valid, the valid current is determined as the actual total current corresponding to the power battery at the target time, and the output power of the power battery is controlled to decrease.

[0138] For example, when only the first total current is valid, the first total current is used as the actual total current of the power battery at the target time, and the output power of the power battery is controlled to be reduced to a second preset power. The second preset power may be 40-60%, for example, 50%.

[0139] When only the second total current is valid, the second total current is used as the actual total current of the power battery at the target time, and the output power of the power battery is controlled to be reduced to a third preset power. The third preset power may be 40-60%, for example, 50%.

[0140] In summary, in the embodiment of the present application, when the vehicle is in the upper high voltage state, the original current corresponding to each high voltage accessory connected to the power battery in the vehicle is collected according to the preset frequency; for each target moment corresponding to the preset frequency during the time period when the vehicle is in the upper high voltage state, the accessory current corresponding to each high voltage accessory at the target moment is determined according to the original current corresponding to each high voltage accessory; the sum of the accessory currents corresponding to each high voltage accessory at the target moment is used as the first total current corresponding to the power battery at the target moment; the second total current corresponding to the power battery at the target moment is collected from the current sensor connected to the power battery; the actual total current corresponding to the power battery at the target moment is determined according to the validity corresponding to each of the first total current and the second total current and the current difference between the first total current and the second total current. It can be seen that the embodiment of the present application can cancel the analog Hall current sensor used in the related art, and instead use the sum of the accessory currents of each high voltage accessory and a current sensor (such as a digital shunt) to monitor the current safety of the power battery, cancel the analog Hall current sensor and do not need to add other sensors or devices, which reduces the current monitoring cost of the power battery on the basis of realizing the monitoring of the current safety of the power battery.

[0141] In addition, since the analog Hall current sensor is eliminated, the workload of functional safety development of the battery management system caused by the analog Hall sensor is reduced, and the functional development efficiency of the battery management system of the power battery is improved.

[0142] In order to further illustrate the above scheme provided in the embodiments of the present application, the following specific examples are provided.

[0143] like Figure 2 As shown, the battery pack (that is, the power battery) of a certain vehicle is connected to five high-voltage accessories, namely the front electric drive, the rear electric drive, the PTC (Positive Temperature Coefficient, positive temperature coefficient heater), the OBC (On Board Charger), and the GCU (Generator Control Unit).

[0144] Among them, for a certain target moment, I1 is the second total current detected by the current sensor (such as a digital shunt), I3 is the current corresponding to the front electric drive, I4 is the current corresponding to the rear electric drive, I5 is the current corresponding to the PTC, I6 is the current corresponding to the OBC, and I7 is the current corresponding to the GCU. I2 is the sum of I3, I4, I5, I6, and I7.

[0145] After the vehicle is connected to high voltage, the BMS (Battery Management System) receives the current of other high-voltage components of the vehicle in real time through the CAN bus, including I3, I4, I5, I6, and I7. The current value corresponding to each high-voltage accessory needs to be processed by conventional filtering, and the accuracy is retained to 0.01A. When transmitting to the CAN bus, a CRC check is added to prevent the CAN network data from being tampered with, and the current valid flag is transmitted at the same time. The current collection cycle of each high-voltage component is required to be less than 10ms, and the transmission cycle to the CAN bus is 10ms.

[0146] The accessory current of each high-voltage accessory is determined according to the method 1 or the method 2 involved in step S121, and then I2 can be obtained.

[0147] Compare I1 and I2 to perform current functional safety verification. Functional safety verification process and processing results:

[0148] When both I1 and I2 are valid and |I1-I2|<Iq (preset current value), I1 is used as the current value of the power battery system and the vehicle is used normally. Whether I1 is valid can be judged by the fault status of the digital shunt and its own CRC check. Whether I2 is valid can be judged by the CRC of I3, I4, I5, I6, I7 and each current valid flag bit; Iq is a fixed threshold value, which is related to the accuracy of the two current sensors.

[0149] When both I1 and I2 are valid and |I1-I2|≥Iq, it is determined that both I1 and I2 are unreliable, and the vehicle is reduced to 80% power;

[0150] I1 is valid, I2 is invalid, I1 is used as the current value of the power battery system, and the vehicle is used with a 50% reduction in power;

[0151] I1 is invalid, I2 is valid, I2 is used as the current value of the power battery system, and the vehicle is used with 50% reduced power;

[0152] Both I1 and I2 are invalid. At this time, it is determined that both I1 and I2 are unreliable and the vehicle cannot be used.

[0153] The above process is repeated until the vehicle stops and the high pressure is lowered. When the vehicle is put on high pressure next time, the above process is repeated again.

[0154] It can be seen that the embodiment of the present application adopts the solution of replacing the second current sensor with the current collected by various high-voltage accessories of the vehicle, which can effectively reduce the cost and development workload of the battery pack to meet the current function safety requirements.

[0155] Based on the same inventive concept, the present application embodiment provides the following Figure 3A power battery current monitoring device is shown, the device comprising:

[0156] The high-voltage accessory current acquisition module 31 is used to acquire the original current corresponding to each high-voltage accessory connected to the power battery in the vehicle according to a preset frequency when the vehicle is in an upper high-voltage state;

[0157] The loop module 32 is used to sequentially take each moment corresponding to the preset frequency during the time period when the vehicle is in the upper high-voltage state as a target moment, and sequentially perform the following steps for each target moment:

[0158] Determine, according to the original currents respectively corresponding to the high-voltage accessories, the accessory currents respectively corresponding to the high-voltage accessories at the target time;

[0159] Taking the sum of the accessory currents corresponding to the various high-voltage accessories at the target time as the first total current corresponding to the power battery at the target time;

[0160] collecting a second total current of the power battery corresponding to the target time from a current sensor connected to the power battery;

[0161] An actual total current corresponding to the power battery at the target time is determined according to respective corresponding validity of the first total current and the second total current and a current difference between the first total current and the second total current.

[0162] Furthermore, the loop module 32 is used to:

[0163] Determine the peak current and the trough current of the three original currents respectively corresponding to each of the high-voltage accessories according to the change trends over time of the three original currents collected by each of the high-voltage accessories at the target time and the last time and the last time closest to the target time;

[0164] When the original current corresponding to at least one first target high-voltage accessory among the high-voltage accessories at the target time is the peak current, the original current corresponding to the first target high-voltage accessory at the target time is used as the accessory current corresponding to the first target high-voltage accessory at the target time, and the peak currents corresponding to the first other high-voltage accessories except the first target high-voltage accessory are used as the accessory current corresponding to each of the first other high-voltage accessories at the target time;

[0165] When the original current corresponding to at least one second target high-voltage accessory among the high-voltage accessories at the target time is the valley current, the original current corresponding to the second target high-voltage accessory at the target time is used as the accessory current corresponding to the second target high-voltage accessory at the target time, and the valley currents corresponding to the second other high-voltage accessories except the second target high-voltage accessory are used as the accessory current corresponding to each of the second other high-voltage accessories at the target time;

[0166] When the original current corresponding to each of the high-voltage accessories at the target time is not the peak current or the valley current, the original current corresponding to each of the high-voltage accessories at the target time is used as the accessory current corresponding to each of the high-voltage accessories at the target time.

[0167] Furthermore, each of the high-voltage accessories connected to the power battery in the vehicle includes at least the front electric drive, rear electric drive, on-board charger and heater of the vehicle.

[0168] Furthermore, the loop module 32 is used to:

[0169] Determine the original currents of the onboard charger and the heater of the vehicle respectively corresponding to the target time as the accessory currents of the onboard charger and the heater respectively corresponding to the target time;

[0170] Determine the peak current and the valley current of the three original currents respectively corresponding to the front electric drive and the rear electric drive according to the change trends over time of the three original currents collected at the target moment and the last moment and the last moment closest to the target moment of the front electric drive and the rear electric drive of the vehicle;

[0171] When the original current corresponding to at least one of the first target high-voltage accessories of the front electric drive and the rear electric drive at the target time is the peak current, the original current corresponding to the first target high-voltage accessory at the target time is used as the accessory current corresponding to the first target high-voltage accessory at the target time, and the peak currents corresponding to the first other high-voltage accessories except the first target high-voltage accessory are used as the accessory currents corresponding to each of the first other high-voltage accessories at the target time;

[0172] When the original current corresponding to at least one of the second target high-voltage accessories of the front electric drive and the rear electric drive at the target time is the valley current, the original current corresponding to the second target high-voltage accessory at the target time is used as the accessory current corresponding to the second target high-voltage accessory at the target time, and the valley currents corresponding to the second other high-voltage accessories except the second target high-voltage accessory are used as the accessory currents corresponding to the second other high-voltage accessories at the target time;

[0173] When the original currents corresponding to the front electric drive and the rear electric drive at the target time are neither the peak current nor the valley current, the original currents corresponding to the front electric drive and the rear electric drive at the target time are respectively used as the accessory currents corresponding to the front electric drive and the rear electric drive at the target time.

[0174] Furthermore, the loop module 32 is used to:

[0175] In a case where both the first total current and the second total current are valid, determining the current difference between the first total current and the second total current;

[0176] When the absolute value of the current difference is less than a preset current value, determining the second total current as the actual total current of the power battery corresponding to the target time;

[0177] When the absolute value of the current difference is greater than or equal to the preset current value, it is determined that neither the first total current nor the second total current is the actual total current corresponding to the power battery at the target time, and the output power of the power battery is controlled to be reduced to a first preset power.

[0178] Furthermore, the loop module 32 is used to:

[0179] When the first total current is valid and the second total current is invalid, determining the first total current as the actual total current of the power battery at the target time, and controlling the output power of the power battery to decrease to a second preset power;

[0180] When the first total current is invalid and the second total current is valid, determining the second total current as the actual total current of the power battery at the target time, and controlling the output power of the power battery to decrease to a third preset power;

[0181] In the case that both the first total current and the second total current are invalid, it is determined that neither the first total current nor the second total current is an actual total current corresponding to the power battery at the target time.

[0182] Furthermore, the current preprocessing module is used to:

[0183] Before determining the accessory current corresponding to each of the high-voltage accessories at the target time based on the original current corresponding to each of the high-voltage accessories, filtering and cyclic redundancy check are performed on the original current corresponding to each of the high-voltage accessories at the target time.

[0184] Based on the same inventive concept, the present application embodiment provides the following Figure 4 An electronic device as shown includes:

[0185] Processor 41;

[0186] A memory 42 for storing instructions executable by the processor 41;

[0187] The processor 41 is configured to execute to implement a power battery current monitoring method as provided above.

[0188] Based on the same inventive concept, an embodiment of the present application provides a non-temporary computer-readable storage medium. When the instructions in the storage medium are executed by the processor 41 of the electronic device, the electronic device can execute a power battery current monitoring method as provided above.

[0189] Since the electronic device introduced in this embodiment is an electronic device used to implement the information processing method in the embodiment of the present application, based on the information processing method introduced in the embodiment of the present application, a person skilled in the art can understand the specific implementation of the electronic device of the present embodiment and its various variations, so how the electronic device implements the method in the embodiment of the present application is not described in detail here. As long as a person skilled in the art implements the electronic device used by the information processing method in the embodiment of the present application, it belongs to the scope of protection of this application.

[0190] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0191] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0192] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0193] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0194] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0195] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A power battery current monitoring method, characterized in that: The method comprises: When the vehicle is in an upper high voltage state, collecting the original current corresponding to each high voltage accessory connected to the power battery in the vehicle according to a preset frequency; Each moment corresponding to the preset frequency during the time period when the vehicle is in the upper high-voltage state is sequentially used as a target moment, and the following steps are sequentially performed for each target moment: Determine, according to the original currents respectively corresponding to the high-voltage accessories, the accessory currents respectively corresponding to the high-voltage accessories at the target time; Taking the sum of the accessory currents corresponding to the various high-voltage accessories at the target time as the first total current corresponding to the power battery at the target time; collecting a second total current of the power battery corresponding to the target time from a current sensor connected to the power battery; An actual total current corresponding to the power battery at the target time is determined according to respective corresponding validity of the first total current and the second total current and a current difference between the first total current and the second total current.

2. The method according to claim 1, characterized in that The determining, according to the original currents respectively corresponding to the high-voltage accessories, the accessory currents respectively corresponding to the high-voltage accessories at the target time, comprises: Determine the peak current and the trough current of the three original currents respectively corresponding to each of the high-voltage accessories according to the change trends over time of the three original currents collected by each of the high-voltage accessories at the target time and the last time and the last time closest to the target time; When the original current corresponding to at least one first target high-voltage accessory among the high-voltage accessories at the target time is the peak current, the original current corresponding to the first target high-voltage accessory at the target time is used as the accessory current corresponding to the first target high-voltage accessory at the target time, and the peak currents corresponding to the first other high-voltage accessories except the first target high-voltage accessory are used as the accessory current corresponding to each of the first other high-voltage accessories at the target time; When the original current corresponding to at least one second target high-voltage accessory among the high-voltage accessories at the target time is the valley current, the original current corresponding to the second target high-voltage accessory at the target time is used as the accessory current corresponding to the second target high-voltage accessory at the target time, and the valley currents corresponding to the second other high-voltage accessories except the second target high-voltage accessory are used as the accessory current corresponding to each of the second other high-voltage accessories at the target time; When the original current corresponding to each of the high-voltage accessories at the target time is not the peak current or the valley current, the original current corresponding to each of the high-voltage accessories at the target time is used as the accessory current corresponding to each of the high-voltage accessories at the target time.

3. The method according to claim 1, characterized in that The various high-voltage accessories connected to the power battery in the vehicle include at least the front electric drive, the rear electric drive, the on-board charger and the heater of the vehicle.

4. The method according to claim 3, characterized in that The determining, according to the original currents respectively corresponding to the high-voltage accessories, the accessory currents respectively corresponding to the high-voltage accessories at the target time, comprises: Determine the original currents of the onboard charger and the heater of the vehicle respectively corresponding to the target time as the accessory currents of the onboard charger and the heater respectively corresponding to the target time; Determine the peak current and the valley current of the three original currents respectively corresponding to the front electric drive and the rear electric drive according to the change trends over time of the three original currents collected at the target moment and the last moment and the last moment closest to the target moment of the front electric drive and the rear electric drive of the vehicle; When the original current corresponding to at least one of the first target high-voltage accessories of the front electric drive and the rear electric drive at the target time is the peak current, the original current corresponding to the first target high-voltage accessory at the target time is used as the accessory current corresponding to the first target high-voltage accessory at the target time, and the peak currents corresponding to the first other high-voltage accessories except the first target high-voltage accessory are used as the accessory currents corresponding to each of the first other high-voltage accessories at the target time; When the original current corresponding to at least one of the second target high-voltage accessories of the front electric drive and the rear electric drive at the target time is the valley current, the original current corresponding to the second target high-voltage accessory at the target time is used as the accessory current corresponding to the second target high-voltage accessory at the target time, and the valley currents corresponding to the second other high-voltage accessories except the second target high-voltage accessory are used as the accessory currents corresponding to the second other high-voltage accessories at the target time; When the original currents corresponding to the front electric drive and the rear electric drive at the target time are neither the peak current nor the valley current, the original currents corresponding to the front electric drive and the rear electric drive at the target time are respectively used as the accessory currents corresponding to the front electric drive and the rear electric drive at the target time.

5. The method according to claim 1, characterized in that The determining, according to the respective validity of the first total current and the second total current and the current difference between the first total current and the second total current, the actual total current corresponding to the power battery at the target time includes: In a case where both the first total current and the second total current are valid, determining the current difference between the first total current and the second total current; When the absolute value of the current difference is less than a preset current value, determining the second total current as the actual total current of the power battery corresponding to the target time; When the absolute value of the current difference is greater than or equal to the preset current value, it is determined that neither the first total current nor the second total current is the actual total current corresponding to the power battery at the target time, and the output power of the power battery is controlled to be reduced to a first preset power.

6. The method according to claim 1, characterized in that The determining, according to the respective validity of the first total current and the second total current and the current difference between the first total current and the second total current, the actual total current corresponding to the power battery at the target time includes: When the first total current is valid and the second total current is invalid, determining the first total current as the actual total current of the power battery at the target time, and controlling the output power of the power battery to decrease to a second preset power; When the first total current is invalid and the second total current is valid, determining the second total current as the actual total current of the power battery at the target time, and controlling the output power of the power battery to decrease to a third preset power; In the case that both the first total current and the second total current are invalid, it is determined that neither the first total current nor the second total current is an actual total current corresponding to the power battery at the target time.

7. The method according to claim 1, characterized in that Before determining the accessory current corresponding to each of the high-voltage accessories at the target time according to the original current corresponding to each of the high-voltage accessories, the method further includes: The original current corresponding to each of the high-voltage accessories at the target time is filtered and cyclic redundancy checked.

8. A power battery current monitoring device, characterized in that: The device comprises: A high-voltage accessory current acquisition module is used to acquire the original current corresponding to each high-voltage accessory connected to the power battery in the vehicle according to a preset frequency when the vehicle is in an upper high-voltage state; A circulation module is used to sequentially take each moment corresponding to the preset frequency during the time period when the vehicle is in the upper high-voltage state as a target moment, and sequentially perform the following steps for each target moment: Determine, according to the original currents respectively corresponding to the high-voltage accessories, the accessory currents respectively corresponding to the high-voltage accessories at the target time; Taking the sum of the accessory currents corresponding to the various high-voltage accessories at the target time as the first total current corresponding to the power battery at the target time; collecting a second total current of the power battery corresponding to the target time from a current sensor connected to the power battery; An actual total current corresponding to the power battery at the target time is determined according to respective corresponding validity of the first total current and the second total current and a current difference between the first total current and the second total current.

9. An electronic device, characterized in that: include: processor; a memory for storing instructions executable by the processor; The processor is configured to execute to implement a power battery current monitoring method as claimed in any one of claims 1 to 7.

10. A non-transitory computer-readable storage medium, when the instructions in the storage medium are executed by a processor of an electronic device, the electronic device is enabled to implement a power battery current monitoring method as described in any one of claims 1 to 7.

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