Electric quantity monitoring method and device of battery pack, battery management system and electronic device

Abstract

The invention discloses an electric quantity monitoring method and device of a battery pack, a battery management system and an electronic device.The method comprises the steps that when it is detected that the battery pack enters a low-current working mode, the current of the high-voltage side of a voltage converter is obtained, the high-voltage side of the voltage converter is connected with the battery pack, and the low-voltage side of the voltage converter is connected with a low-voltage electricity load; determining the power consumption of the battery pack in the low-current working mode according to the current of the high-voltage side and the duration of the low-current working mode; the residual electric quantity of the battery pack is determined according to the power consumption, so that accurate monitoring and calculation of the residual electric quantity of the battery pack in a low-current working mode can be realized under the condition that hardware of an existing current sampling circuit does not need to be changed, the problem of insufficient low-current sampling precision is effectively solved, the cost is reduced, and the power consumption of the battery pack is reduced. And the working precision of the battery management system is improved.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to a method and device for monitoring the power of a battery pack, a battery management system and an electronic device. Background Art

[0002] In daily life, in order to monitor the vehicle's surroundings when parking and ensure that the vehicle is within a safe range, more and more vehicles on the market are equipped with sentry mode. When the sentry mode is enabled, it mainly relies on cameras and related modules to work. Compared with large current charging and discharging, the discharge current of the battery pack is relatively small. However, the traditional battery pack current sampling method is mainly suitable for large current charging and discharging conditions. It is not accurate for long-term low current operation in sentry mode, which may lead to inaccurate current sampling, resulting in errors in the battery pack power consumption calculated based on ampere-hour integration, and thus the risk of battery remaining power jumping when the sentry mode is turned on for a long time.

[0003] In the prior art, there is a current sampling circuit that is compatible with small current sampling. By controlling the intelligent switching of the large current sampling port and the small current sampling port through a microcontroller, it can adapt to a wide range of current sampling requirements from small to large, and solves the problem of insufficient accuracy of small current sampling in sentinel mode. However, due to the addition of a small current acquisition module and related circuits, it means that the hardware complexity and cost are increased. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0005] To this end, one purpose of the present invention is to propose a battery pack power monitoring method, which can achieve accurate monitoring and calculation of the battery pack power consumption in the low current working mode without making hardware changes to the existing current sampling circuit, effectively solving the problem of insufficient accuracy of small current sampling, thereby reducing costs while improving the working accuracy of the battery management system.

[0006] Therefore, a second objective of the present invention is to provide a battery pack power monitoring device.

[0007] To this end, a third objective of the present invention is to provide a battery management system.

[0008] To this end, a fourth objective of the present invention is to provide an electronic device.

[0009] To this end, a fifth object of the present invention is to provide a vehicle.

[0010] To this end, a sixth object of the present invention is to provide a computer-readable storage medium.

[0011] In order to achieve the above-mentioned purpose, an embodiment of the first aspect of the present invention proposes a method for monitoring the power of a battery pack, the method comprising: when it is detected that the battery pack enters a low-current working mode, obtaining the current on the high-voltage side of the voltage converter, wherein the high-voltage side of the voltage converter is connected to the battery pack, and the low-voltage side of the voltage converter is connected to a low-voltage power load; determining the power consumption of the battery pack in the low-current working mode according to the current on the high-voltage side and the duration of the low-current working mode; and determining the remaining power of the battery pack according to the power consumption. Thus, accurate monitoring and calculation of the remaining power of the battery pack in the low-current working mode can be achieved without making hardware changes to the existing current sampling circuit, effectively solving the problem of insufficient precision in small current sampling, thereby reducing costs while improving the working accuracy of the battery management system.

[0012] According to the battery pack power monitoring method of an embodiment of the present invention, when it is detected that the battery pack enters a low current operating mode, the power consumption of the battery pack in the low current operating mode can be determined by obtaining the current on the high voltage side of the voltage converter and the duration of the low current operating mode. Therefore, without making hardware changes to the existing current sampling circuit, accurate monitoring and calculation of the power consumption of the battery pack in the low current operating mode can be achieved, effectively solving the problem of insufficient accuracy of small current sampling, thereby improving the operating accuracy of the battery management system while reducing costs.

[0013] In addition, the battery pack power monitoring method according to the above embodiment of the present invention may also have the following additional technical features:

[0014] In some examples, after determining the remaining power of the battery pack according to the power consumption, the method further includes: determining a current state of charge of the battery pack according to the remaining power.

[0015] In some examples, determining the remaining power of the battery pack based on the power consumption includes: obtaining a first power corresponding to the battery pack before the vehicle enters the low current operating mode; and obtaining the remaining power based on the difference between the first power and the power consumption.

[0016] In some examples, determining the power consumption of the battery pack in the low current operating mode based on the current on the high voltage side and the duration of the low current operating mode includes: integrating the current on the high voltage side and multiplying it by the duration of the low current operating mode to obtain the power consumption.

[0017] In some examples, obtaining the current on the high-voltage side of the voltage converter includes: obtaining the current on the low-voltage side and the voltage on the low-voltage side of the voltage converter, and obtaining the voltage on the high-voltage side of the voltage converter; determining the current on the high-voltage side of the voltage converter based on the current on the low-voltage side and the voltage on the low-voltage side of the voltage converter and the voltage on the high-voltage side of the voltage converter.

[0018] In some examples, the current on the high voltage side of the voltage converter is obtained based on the ratio of a first product and a second product, wherein the first product is the product of the current on the low voltage side of the voltage converter and the voltage on the low voltage side of the voltage converter, and the second product is the product of the voltage on the high voltage side of the voltage converter and the efficiency of the voltage converter.

[0019] In some examples, the current on the high voltage side of the voltage converter

[0020] Wherein, I2 is the current on the low voltage side of the voltage converter, U2 is the voltage on the low voltage side of the voltage converter, U1 is the voltage on the high voltage side of the voltage converter, and η is the efficiency of the voltage converter.

[0021] In some examples, the method further includes: when it is detected that the current output by the battery pack is lower than a preset current threshold and lasts for more than a preset time, determining that the battery includes entering the low current operating mode.

[0022] In some examples, the low current operating mode includes a sentinel mode.

[0023] To achieve the above-mentioned objectives, an embodiment of the second aspect of the present invention discloses a battery pack power monitoring device, including: an acquisition module, used to acquire the current on the high-voltage side of the voltage converter when it is detected that the battery pack enters a low-current operating mode, wherein the high-voltage side of the voltage converter is connected to the battery pack, and the low-voltage side of the voltage converter is connected to a low-voltage power load; a first processing module, used to determine the power consumption of the battery pack in the low-current operating mode according to the current on the high-voltage side and the duration of the low-current operating mode; a second processing module, used to determine the remaining power of the battery pack according to the power consumption.

[0024] According to the battery pack power monitoring device of the embodiment of the present invention, when it is detected that the battery pack enters the low current working mode, the power consumption of the battery pack in the low current working mode can be determined by obtaining the current on the high voltage side of the voltage converter and the duration of the low current working mode. Therefore, without making hardware changes to the existing current sampling circuit, accurate monitoring and calculation of the power consumption of the battery pack in the low current working mode can be achieved, which effectively solves the problem of insufficient accuracy of small current sampling, thereby improving the working accuracy of the battery management system while reducing costs.

[0025] To achieve the above-mentioned purpose, a third aspect of the present invention discloses a battery management system, including: a battery pack power monitoring device as described in the second aspect of the present invention.

[0026] According to the battery management system of an embodiment of the present invention, when it is detected that the battery pack enters the low current working mode, the power consumption of the battery pack in the low current working mode can be determined by obtaining the current on the high voltage side of the voltage converter and the duration of the low current working mode. Therefore, without making hardware changes to the existing current sampling circuit, accurate monitoring and calculation of the power consumption of the battery pack in the low current working mode can be achieved, effectively solving the problem of insufficient accuracy of small current sampling, thereby improving the working accuracy of the battery management system while reducing costs.

[0027] To achieve the above-mentioned purpose, an embodiment of the fourth aspect of the present invention discloses an electronic device, comprising: a processor, the processor is connected to a memory, the memory stores a battery pack power monitoring program, and the battery pack power monitoring program, when executed by the processor, implements the battery pack power monitoring method as described in the embodiment of the first aspect of the present invention.

[0028] According to the electronic device of an embodiment of the present invention, when it is detected that the battery pack enters the low current working mode, the power consumption of the battery pack in the low current working mode can be determined by obtaining the current on the high voltage side of the voltage converter and the duration of the low current working mode. Therefore, without making hardware changes to the existing current sampling circuit, accurate monitoring and calculation of the power consumption of the battery pack in the low current working mode can be achieved, effectively solving the problem of insufficient accuracy of small current sampling, thereby improving the working accuracy of the battery management system while reducing costs.

[0029] To achieve the above objectives, a fifth embodiment of the present invention discloses a vehicle, comprising: a battery management system as described in the embodiment of the third aspect of the present invention; or an electronic device as described in the embodiment of the fourth aspect of the present invention.

[0030] According to the vehicle of the embodiment of the present invention, when it is detected that the battery pack enters the low current operating mode, the power consumption of the battery pack in the low current operating mode can be determined by obtaining the current on the high voltage side of the voltage converter and the duration of the low current operating mode. Therefore, without making hardware changes to the existing current sampling circuit, accurate monitoring and calculation of the power consumption of the battery pack in the low current operating mode can be achieved, effectively solving the problem of insufficient accuracy of small current sampling, thereby improving the operating accuracy of the battery management system while reducing costs.

[0031] To achieve the above-mentioned objectives, the sixth aspect of the present invention discloses a computer-readable storage medium, on which a battery pack power monitoring program is stored. When the battery pack power monitoring program is executed by a processor, the battery pack power monitoring method as described in the embodiment of the first aspect of the present invention is implemented.

[0032] According to the computer-readable storage medium of an embodiment of the present invention, when the power monitoring program of the battery pack is executed by the processor, if it is detected that the battery pack enters the low current working mode, the power consumption of the battery pack in the low current working mode can be determined by obtaining the current on the high voltage side of the voltage converter and the duration of the low current working mode. Therefore, without making hardware changes to the existing current sampling circuit, accurate monitoring and calculation of the power consumption of the battery pack in the low current working mode can be achieved, effectively solving the problem of insufficient accuracy of small current sampling, thereby improving the working accuracy of the battery management system while reducing costs.

[0033] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0035] Figure 1 is a flow chart of a battery pack power monitoring method according to an embodiment of the present invention;

[0036] Figure 2 is a schematic diagram of a circuit in a low current working mode according to an embodiment of the present invention;

[0037] Figure 3 Schematic diagram of a battery pack power monitoring device according to an embodiment of the present invention.

[0038] Reference numerals:

[0039] Battery pack power monitoring device-100; acquisition module-110; first processing module-120; second processing module-130. DETAILED DESCRIPTION

[0040] Embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Embodiments of the present invention are described in detail below.

[0041] Reference below Figure 1-Figure 3 A method and device for monitoring the power level of a battery pack, a battery management system, and an electronic device according to embodiments of the present invention are described.

[0042] Figure 1 FIG. 1 is a flow chart of a method for monitoring the power level of a battery pack according to an embodiment of the present invention. Figure 1 As shown, the battery pack power monitoring method includes:

[0043] Step S1: When it is detected that the battery pack enters a low current working mode, the current on the high voltage side of the voltage converter is obtained, wherein the high voltage side of the voltage converter is connected to the battery pack and the low voltage side of the voltage converter is connected to a low voltage power load.

[0044] Specifically, in the process of monitoring the power level of the battery pack, since the high-voltage side of the voltage converter is connected to the battery pack and the low-voltage side of the voltage converter is connected to the low-voltage power load, the voltage converter can monitor the current output by the battery pack in real time. When it is detected that the battery pack enters a low-current operating mode, the current information of the high-voltage side of the voltage converter can be obtained, including but not limited to setting a current sensor or a current detection circuit.

[0045] In a specific embodiment, the preset current threshold and the preset time can be preset according to experimental data and actual conditions, and the preset current threshold includes but is not limited to 1A.

[0046] Step S2: Determine the power consumption of the battery pack in the low current working mode according to the current on the high voltage side and the duration of the low current working mode.

[0047] Specifically, after the battery pack enters the low-current operating mode, the current value output by the battery pack can be monitored and recorded in real time through a voltage converter connected to the high-voltage side of the battery pack. Furthermore, the duration from the time the battery pack enters the low-current operating mode to the time it exits the mode can be recorded, and then the power consumption of the battery pack in the low-current operating mode can be determined through an internal preset algorithm, including but not limited to the ampere-hour integration method.

[0048] Step S3: Determine the remaining power of the battery pack according to the power consumption.

[0049] Specifically, after obtaining the power consumption of the battery pack in the low current operating mode, the remaining power of the battery pack can be determined based on the power consumption. Specifically, in the process of determining the remaining power of the battery pack, the real-time power of the battery pack can be obtained and recorded when the battery pack enters the low current operating mode, so that the battery management system can determine the remaining power of the battery pack based on the recorded real-time power and power consumption.

[0050] In summary, according to the battery pack power monitoring method of an embodiment of the present invention, when it is detected that the battery pack enters the low current working mode, the power consumption of the battery pack in the low current working mode can be determined by obtaining the current on the high voltage side of the voltage converter and the duration of the low current working mode. Therefore, without making hardware changes to the existing current sampling circuit, accurate monitoring and calculation of the power consumption of the battery pack in the low current working mode can be achieved, effectively solving the problem of insufficient accuracy of small current sampling, thereby reducing costs while improving the working accuracy of the battery management system.

[0051] In one embodiment of the present invention, after determining the remaining power of the battery pack according to the power consumption, the method further includes: determining a current state of charge of the battery pack according to the remaining power.

[0052] Specifically, after determining the power consumption of the battery pack in the low current working mode and determining the remaining power of the battery pack, the current state of charge of the battery pack can be determined according to the remaining power. Specifically, the remaining power of the battery pack can be converted into a percentage form. The conversion formula can be: current state of charge of the battery pack = (remaining power / rated capacity) × 100%, that is, the ratio of the remaining power of the battery pack to the rated total capacity multiplied by 100%. For example, assuming that the rated total capacity of a battery pack is 60Ah, in the low current working mode, after a period of time, the remaining power is calculated to be 48Ah, then the current state of charge of the battery pack = 48Ah / 60Ah × 100% = 80%, that is, the remaining power of the battery pack is 80% of the rated total capacity. It can be understood that by converting the remaining power of the battery pack into the current state of charge of the battery pack, the change of the remaining power of the battery pack can be accurately monitored, thereby avoiding the problem of the state of charge jump of the battery pack when the low current working mode is turned on for a long time.

[0053] In one embodiment of the present invention, the remaining power of the battery pack is determined based on the power consumption, including: obtaining a first power corresponding to the battery pack before the vehicle enters a low current operating mode; and obtaining the remaining power based on the difference between the first power and the power consumption.

[0054] Specifically, before the vehicle starts to enter the low current operating mode, the battery management system can record the current charge of the battery pack, that is, the first charge of the battery pack, including but not limited to the full charge value after the most recent charging before the vehicle starts to enter the low current operating mode, or before the vehicle starts to enter the low current operating mode, a real-time updated value calculated based on the power consumption during previous driving or parking.

[0055] Furthermore, the power consumption calculated in the low current working mode can be deducted from the first power to obtain the remaining power. For example, the first power can be recorded as Q, the power consumption of the battery pack in the low current working mode is Q1, and the remaining power is Q2. The calculation formula can be Q2=Q-Q1.

[0056] In one embodiment of the present invention, the power consumption of the battery pack in the low current working mode is determined based on the current on the high voltage side and the duration of the low current working mode, including: integrating the current on the high voltage side and multiplying it by the duration of the low current working mode to obtain the power consumption.

[0057] Specifically, when the battery pack enters the low-current operating mode, the current output by the battery pack may fluctuate with the change of the low-voltage power load. Therefore, when determining the power consumption of the battery pack in the low-current operating mode based on the current on the high-voltage side and the duration of the low-current operating mode, the current on the high-voltage side in the low-current operating mode can be recorded and integrated to convert the change of the high-voltage side current over time into a power value. The power value obtained by the integral operation is then multiplied by the duration of the low-current operating mode to obtain the power consumption of the battery pack in the low-current operating mode. For example, the current on the high-voltage side can be recorded as I1, the power consumption of the battery pack in the low-current operating mode can be recorded as Q1, and the duration of the low-current operating mode can be recorded as h. The calculation formula can be Q1=∫I1*h.

[0058] In one embodiment of the present invention, obtaining the current on the high voltage side of the voltage converter includes: obtaining the current on the low voltage side of the voltage converter and the voltage on the low voltage side, and obtaining the voltage on the high voltage side of the voltage converter; determining the current on the high voltage side of the voltage converter based on the current on the low voltage side of the voltage converter and the voltage on the low voltage side and the voltage on the high voltage side of the voltage converter.

[0059] Specifically, when obtaining the current on the high-voltage side of the voltage converter, the current and voltage on the low-voltage side of the voltage converter connected to the low-voltage electrical load can be monitored in real time through a current sensor, a voltage sensor, or a current detection circuit, a voltage detection circuit, etc., that is, the current and voltage when the low-voltage electrical load is operating normally. Similarly, the voltage on the high-voltage side of the voltage converter connected to the battery pack can be monitored in real time through a voltage detection circuit or a voltage sensor.

[0060] Furthermore, based on the obtained current, voltage and high voltage side voltage of the voltage converter, the current on the high voltage side of the voltage converter is determined by an internal preset algorithm, including but not limited to Ohm's law.

[0061] In one embodiment of the present invention, the current on the high voltage side of the voltage converter is obtained based on the ratio of a first product and a second product, the first product being the product of the current on the low voltage side of the voltage converter and the voltage on the low voltage side of the voltage converter, and the second product being the product of the voltage on the high voltage side of the voltage converter and the efficiency of the voltage converter.

[0062] Specifically, the current on the high-voltage side of the voltage converter can be obtained according to the ratio of the first product and the second product, wherein the first product is the product of the current on the low-voltage side of the voltage converter and the voltage on the low-voltage side of the voltage converter, that is, the power value of the voltage converter on the low-voltage side, and the second product is the product of the voltage on the high-voltage side of the voltage converter and the efficiency of the voltage converter, that is, the high-voltage side voltage value adjusted by the efficiency of the voltage converter.

[0063] In one embodiment of the present invention, the current on the high voltage side of the voltage converter

[0064] Wherein, I2 is the current on the low voltage side of the voltage converter, U2 is the voltage on the low voltage side of the voltage converter, U1 is the voltage on the high voltage side of the voltage converter, and η is the efficiency of the voltage converter.

[0065] Specifically, the calculation formula for the current on the high-voltage side of the voltage converter is as shown above, wherein I1 represents the current on the high-voltage side of the voltage converter, that is, the output current of the battery pack; I2 represents the current on the low-voltage side of the voltage converter, that is, the current when the low-voltage electrical load is working normally; U2 represents the voltage on the low-voltage side of the voltage converter, that is, the voltage when the low-voltage electrical load is working normally, and U2*I2 can be used to obtain the power output when the low-voltage electrical load is working normally, that is, the energy consumption; U1 represents the voltage on the high-voltage side of the voltage converter, that is, the output voltage of the battery pack; η represents the efficiency of the voltage converter, that is, the ability of the voltage converter to convert input electrical energy into output electrical energy.

[0066] In a specific embodiment, in combination Figure 2As shown, in the low-current working mode, the battery pack first closes the negative contactor K2, and then closes the pre-charging contactor K3 for pre-charging, so as to avoid the impact of the instantaneous large current generated when the main contactor K1 is directly closed on the circuit; after the pre-charging is completed, the battery pack closes the main contactor K1, and then disconnects the pre-charging contactor K3, and the voltage converter converts the high-voltage electricity of the battery pack into low-voltage electricity to supply power to the low-voltage electrical load. At this time, the voltage and current on the low-voltage side of the voltage converter are equivalent to the voltage U2 and current I2 when the low-voltage electrical load is working, the current on the high-voltage side of the voltage converter is equivalent to the output current I1 of the battery pack, and the voltage on the high-voltage side of the voltage converter is equivalent to the output voltage U1 of the battery pack.

[0067] In one embodiment of the present invention, the battery pack power monitoring method further includes: when it is detected that the current output by the battery pack is lower than a preset current threshold and the duration exceeds a preset time, determining that the battery pack enters a low current working mode.

[0068] Specifically, in the process of determining whether the battery pack enters the low-current operating mode, the current output by the battery pack can be continuously detected. When the current output by the battery pack is lower than a preset current threshold, that is, the battery pack enters a low-current state, the duration of the battery pack entering the low-current state can be further recorded. When the duration exceeds the preset time, that is, the short and occasional low-current state is filtered out, it can be determined that the battery has entered the low-current operating mode.

[0069] In a specific embodiment, the preset current threshold and the preset time can be determined according to the technical specifications of the battery pack, experimental data, etc.

[0070] In one embodiment of the present invention, the low current operating mode includes a sentinel mode.

[0071] Specifically, the low-current operating mode includes the sentinel mode. In the sentinel mode, most of the vehicle's systems enter a dormant state, and only the battery pack needs to output a small current to maintain some operating conditions. That is, the vehicle does not need a large amount of electrical energy to maintain normal operation, and the discharge current of the battery pack is relatively small. For example, when the user parks the vehicle for a long time and there is no one on duty, when the sentinel mode is turned on, only the camera and related modules work, and the discharge current of the battery pack is relatively small.

[0072] In summary, according to the battery pack power monitoring method of an embodiment of the present invention, when it is detected that the battery pack enters the low current working mode, the power consumption of the battery pack in the low current working mode can be determined by obtaining the current on the high voltage side of the voltage converter and the duration of the low current working mode. Therefore, without making hardware changes to the existing current sampling circuit, accurate monitoring and calculation of the power consumption of the battery pack in the low current working mode can be achieved, which effectively solves the problem of insufficient accuracy of small current sampling, thereby improving the working accuracy of the battery management system while reducing costs; further, by converting the remaining power of the battery pack into the current state of charge of the battery pack, the change of the remaining power of the battery pack can be accurately monitored, thereby avoiding the problem of charge state jump of the battery pack when the low current working mode is turned on for a long time.

[0073] A further embodiment of the present invention also provides a battery pack power monitoring device 100 .

[0074] Figure 3 FIG. 1 is a schematic diagram of a battery pack power monitoring device 100 according to an embodiment of the present invention. Figure 3 As shown, the battery pack power monitoring device 100 includes: an acquisition module 110, a first processing module 120, and a second processing module 130.

[0075] Specifically, the acquisition module 110 is used to acquire the current on the high voltage side of the voltage converter when it is detected that the battery pack enters a low current operating mode, wherein the high voltage side of the voltage converter is connected to the battery pack and the low voltage side of the voltage converter is connected to a low voltage power load.

[0076] The first processing module 120 is used to determine the power consumption of the battery pack in the low current working mode according to the current of the high voltage side and the duration of the low current working mode.

[0077] The second processing module 130 is used to determine the remaining power of the battery pack according to the power consumption.

[0078] In one embodiment of the present invention, after determining the remaining power of the battery pack according to the power consumption, the second processing module 130 is further configured to: determine the current state of charge of the battery pack according to the remaining power.

[0079] In one embodiment of the present invention, when determining the remaining power of the battery pack based on power consumption, the second processing module 130 is specifically used to: obtain a first power corresponding to the battery pack before the vehicle enters a low current operating mode; and obtain the remaining power based on the difference between the first power and the power consumption.

[0080] In one embodiment of the present invention, when determining the power consumption of the battery pack in the low current working mode based on the current on the high voltage side and the duration of the low current working mode, the first processing module 120 is specifically used to: integrate the current on the high voltage side, and then multiply it by the duration of the low current working mode to obtain the power consumption.

[0081] In one embodiment of the present invention, when acquiring the current on the high-voltage side of the voltage converter, the acquisition module 110 is specifically used to: acquire the current on the low-voltage side and the voltage on the low-voltage side of the voltage converter, and acquire the voltage on the high-voltage side of the voltage converter; determine the current on the high-voltage side of the voltage converter based on the current on the low-voltage side of the voltage converter and the voltage on the low-voltage side and the voltage on the high-voltage side of the voltage converter.

[0082] In one embodiment of the present invention, the current on the high voltage side of the voltage converter is obtained based on the ratio of a first product and a second product, the first product being the product of the current on the low voltage side of the voltage converter and the voltage on the low voltage side of the voltage converter, and the second product being the product of the voltage on the high voltage side of the voltage converter and the efficiency of the voltage converter.

[0083] In one embodiment of the present invention, the current on the high voltage side of the voltage converter

[0084] Wherein, I2 is the current on the low voltage side of the voltage converter, U2 is the voltage on the low voltage side of the voltage converter, U1 is the voltage on the high voltage side of the voltage converter, and η is the efficiency of the voltage converter.

[0085] In one embodiment of the present invention, when it is detected that the current output by the battery pack is lower than a preset current threshold and the duration exceeds a preset time, determining that the battery pack enters a low current operation mode.

[0086] In one embodiment of the present invention, the low current operating mode includes a sentinel mode.

[0087] It should be noted that when monitoring the power level of a battery pack, the specific implementation method of the power level monitoring device 100 of the battery pack is similar to the specific implementation method of the power level monitoring method of the battery pack of any one of the above-mentioned embodiments of the present invention. Therefore, for a detailed exemplary description of the power level monitoring device 100 of the battery pack, please refer to the relevant description part of the power level monitoring method of the battery pack mentioned above. In order to reduce redundancy, it will not be repeated here.

[0088] According to the battery pack power monitoring device 100 of the embodiment of the present invention, when it is detected that the battery pack enters the low current working mode, the power consumption of the battery pack in the low current working mode can be determined by obtaining the current on the high voltage side of the voltage converter and the duration of the low current working mode. Therefore, without making hardware changes to the existing current sampling circuit, accurate monitoring and calculation of the power consumption of the battery pack in the low current working mode can be achieved, effectively solving the problem of insufficient accuracy of small current sampling, thereby improving the working accuracy of the battery management system while reducing costs; further, by converting the remaining power of the battery pack into the current state of charge of the battery pack, the change of the remaining power of the battery pack can be accurately monitored, thereby avoiding the problem of charge state jump of the battery pack when the low current working mode is turned on for a long time.

[0089] A further embodiment of the present invention provides a battery management system, comprising: a battery pack power monitoring device 100 according to the above-mentioned second aspect of the present invention.

[0090] It should be noted that when the battery management system monitors the power of the battery pack, its specific implementation method is similar to the specific implementation method of the battery pack power monitoring method or the battery pack power monitoring device 100 of any one of the above-mentioned embodiments of the present invention. Therefore, for a detailed exemplary description of the power monitoring process of the battery pack, please refer to the aforementioned relevant description part of the battery pack power monitoring method or the battery pack power monitoring device 100. In order to reduce redundancy, it will not be repeated here.

[0091] According to the battery management system of an embodiment of the present invention, when it is detected that the battery pack enters the low current working mode, the power consumption of the battery pack in the low current working mode can be determined by obtaining the current on the high voltage side of the voltage converter and the duration of the low current working mode. Therefore, without making hardware changes to the existing current sampling circuit, accurate monitoring and calculation of the power consumption of the battery pack in the low current working mode can be achieved, effectively solving the problem of insufficient accuracy of small current sampling, thereby improving the working accuracy of the battery management system while reducing costs; further, by converting the remaining power of the battery pack into the current state of charge of the battery pack, the change of the remaining power of the battery pack can be accurately monitored, thereby avoiding the problem of charge state jump of the battery pack when the low current working mode is turned on for a long time.

[0092] A further embodiment of the present invention also discloses an electronic device, comprising: a processor, the processor is connected to a memory, the memory stores a battery pack power monitoring program, and when the battery pack power monitoring program is executed by the processor, a battery pack power monitoring method as described in the first aspect of the present invention is implemented.

[0093] According to the electronic device of the embodiment of the present invention, when it is detected that the battery pack enters the low-current operating mode, the power consumption of the battery pack in the low-current operating mode can be determined by obtaining the current on the high-voltage side of the voltage converter and the duration of the low-current operating mode. Therefore, without making hardware changes to the existing current sampling circuit, accurate monitoring and calculation of the power consumption of the battery pack in the low-current operating mode can be achieved, effectively solving the problem of insufficient accuracy of small current sampling, thereby improving the working accuracy of the battery management system while reducing costs; further, by converting the remaining power of the battery pack into the current state of charge of the battery pack, the change of the remaining power of the battery pack can be accurately monitored, thereby avoiding the problem of charge state jump of the battery pack when the low-current operating mode is turned on for a long time.

[0094] A further embodiment of the present invention also discloses a vehicle, comprising: a battery management system according to the above-mentioned third aspect of the present invention or an electronic device according to the above-mentioned fourth aspect of the present invention.

[0095] According to the vehicle of the embodiment of the present invention, when it is detected that the battery pack enters the low-current operating mode, the power consumption of the battery pack in the low-current operating mode can be determined by obtaining the current on the high-voltage side of the voltage converter and the duration of the low-current operating mode. Therefore, without making hardware changes to the existing current sampling circuit, accurate monitoring and calculation of the power consumption of the battery pack in the low-current operating mode can be achieved, effectively solving the problem of insufficient accuracy of small current sampling, thereby improving the working accuracy of the battery management system while reducing costs; further, by converting the remaining power of the battery pack into the current state of charge of the battery pack, the change of the remaining power of the battery pack can be accurately monitored, thereby avoiding the problem of charge state jump of the battery pack when the low-current operating mode is turned on for a long time.

[0096] A further embodiment of the present invention also discloses a computer-readable storage medium, on which a battery pack power monitoring program is stored. When the battery pack power monitoring program is executed by a processor, a battery pack power monitoring method as in the embodiment of the first aspect of the present invention is implemented.

[0097] According to the computer-readable storage medium of an embodiment of the present invention, when the battery pack power monitoring program is executed by the processor, if it is detected that the battery pack enters a low-current operating mode, the power consumption of the battery pack in the low-current operating mode can be determined by obtaining the current on the high-voltage side of the voltage converter and the duration of the low-current operating mode. Therefore, without making hardware changes to the existing current sampling circuit, accurate monitoring and calculation of the power consumption of the battery pack in the low-current operating mode can be achieved, effectively solving the problem of insufficient accuracy of small current sampling, thereby improving the working accuracy of the battery management system while reducing costs; further, by converting the remaining power of the battery pack into the current state of charge of the battery pack, the change of the remaining power of the battery pack can be accurately monitored, thereby avoiding the problem of charge state jump of the battery pack when the low-current operating mode is turned on for a long time.

[0098] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0099] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A method for monitoring the power of a battery pack, characterized in that: include: When it is detected that the battery pack enters a low-current working mode, the current on the high-voltage side of the voltage converter is obtained, wherein the high-voltage side of the voltage converter is connected to the battery pack, and the low-voltage side of the voltage converter is connected to a low-voltage power load; Determine the power consumption of the battery pack in the low current working mode according to the current of the high voltage side and the duration of the low current working mode; The remaining power of the battery pack is determined according to the power consumption.

2. The battery pack power monitoring method according to claim 1, characterized in that: After determining the remaining power of the battery pack according to the power consumption, the method further includes: The current state of charge of the battery pack is determined according to the remaining power.

3. The battery pack power monitoring method according to claim 1, characterized in that: Determining the remaining power of the battery pack according to the power consumption includes: Acquire a first power level of the battery pack before the vehicle enters the low-current operating mode; The remaining power is obtained according to a difference between the first power and the power consumption.

4. The battery pack power monitoring method according to claim 1, characterized in that: The determining the power consumption of the battery pack in the low current working mode according to the current of the high voltage side and the duration of the low current working mode includes: After integrating the current on the high-voltage side, the current is multiplied by the duration of the low-current working mode to obtain the power consumption.

5. The battery pack power monitoring method according to claim 1, characterized in that: The step of obtaining the current on the high voltage side of the voltage converter comprises: Acquiring a current on a low voltage side and a voltage on the low voltage side of the voltage converter, and acquiring a voltage on a high voltage side of the voltage converter; The current on the high voltage side of the voltage converter is determined according to the current and the voltage on the low voltage side of the voltage converter and the voltage on the high voltage side of the voltage converter.

6. The battery pack power monitoring method according to claim 1, characterized in that: The current on the high-voltage side of the voltage converter is obtained based on the ratio of a first product and a second product, wherein the first product is the product of the current on the low-voltage side of the voltage converter and the voltage on the low-voltage side of the voltage converter, and the second product is the product of the voltage on the high-voltage side of the voltage converter and the efficiency of the voltage converter.

7. The battery pack power monitoring method according to claim 1 or 6, characterized in that: The current on the high side of the voltage converter Wherein, I2 is the current on the low voltage side of the voltage converter, U2 is the voltage on the low voltage side of the voltage converter, U1 is the voltage on the high voltage side of the voltage converter, and η is the efficiency of the voltage converter.

8. The battery pack power monitoring method according to claim 1, characterized in that: The method further comprises: When it is detected that the current output by the battery pack is lower than a preset current threshold and the duration exceeds a preset time, determining that the battery includes entering the low current working mode.

9. The battery pack power monitoring method according to claim 1, characterized in that: The low current operating mode includes a sentinel mode.

10. A battery pack power monitoring device, characterized in that: include: An acquisition module, configured to acquire the current of the high-voltage side of the voltage converter when it is detected that the battery pack enters a low-current working mode, wherein the high-voltage side of the voltage converter is connected to the battery pack, and the low-voltage side of the voltage converter is connected to a low-voltage power load; A first processing module, used for determining the power consumption of the battery pack in the low current working mode according to the current of the high voltage side and the duration of the low current working mode; The second processing module is used to determine the remaining power of the battery pack according to the power consumption.

11. A battery management system, characterized in that: include: The battery pack power monitoring device as claimed in claim 10.

12. An electronic device, characterized in that: include: A processor, wherein the processor is connected to a memory, wherein the memory stores a battery pack power monitoring program, and when the battery pack power monitoring program is executed by the processor, the battery pack power monitoring method as described in any one of claims 1 to 9 is implemented.

13. A vehicle, characterized in that: include: The battery management system as claimed in claim 11 or the electronic device as claimed in claim 12.

14. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a battery pack power monitoring program, and when the battery pack power monitoring program is executed by the processor, the battery pack power monitoring method according to any one of claims 1 to 9 is implemented.

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