Standard duration determination method, system, device and equipment for battery depolarization

Abstract

Embodiments of the present application provide a method, system, device and equipment for determining a standard duration of battery depolarization. The method comprises: obtaining feature information of a plurality of sample batteries within a preset duration; the preset duration is a length of time backtracking from an undersupply time of the sample batteries; determining actual discharge power and allowable discharge power of the sample batteries corresponding to each time within the preset duration based on the feature information; the allowable discharge power is a power at which the battery continuously discharges for a set duration without undersupply; and determining a standard duration of battery depolarization based on the feature information, the actual discharge power and the allowable discharge power. The determined standard duration of battery depolarization has high accuracy.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a method, system, device and equipment for determining a standard duration of battery depolarization. BACKGROUND

[0002] An electric vehicle is a vehicle that uses a battery as an energy source. During the use of the electric vehicle, the battery will inevitably be polarized, which will reduce the battery's ability to withstand large currents. Therefore, in order to maintain the battery, the battery is generally controlled to discharge at a preset maximum discharge power only when it is determined that the battery is in a completely depolarized state.

[0003] The existing solution determines that the standard for determining that the battery is in a completely depolarized state is that the actual discharge power of the battery is less than the preset allowable discharge power and lasts for more than 5 seconds; the allowable discharge power refers to the power at which the battery continuously discharges at a constant power for 5 minutes without appearing under-voltage. The above-mentioned 5 seconds is a standard duration of battery depolarization determined according to experience. The determination of the standard duration does not consider the influence of different temperatures and different states of charge of the battery on the depolarization rate of the battery in actual battery working conditions, has low accuracy, and is easy to cause the battery to appear under-voltage due to insufficient depolarization duration when discharging at a large power later, thereby affecting the user experience. SUMMARY

[0004] In view of the above problems, the present application provides a method, system, device, equipment and vehicle for determining a standard duration of battery depolarization to solve the above problems or at least partially solve the above problems.

[0005] In an embodiment of the present application, a method for determining a standard duration of battery depolarization is provided. The method comprises:

[0006] obtaining feature information of a plurality of sample batteries within a preset duration; the preset duration is a length of time backtracked from a time point when the sample battery appears under-voltage;

[0007] determining, based on the feature information, an actual discharge power and an allowable discharge power of the sample battery corresponding to each time within the preset duration; wherein the allowable discharge power is a power at which the battery continuously discharges at a constant power for a set duration without appearing under-voltage;

[0008] determining, based on the feature information, the actual discharge power and the allowable discharge power, a standard duration of battery depolarization.

[0009] In another embodiment of the present application, a method for determining a standard duration of battery depolarization is provided. The method comprises:

[0010] receive standard duration information of battery depolarization; wherein the standard duration information comprises standard durations of battery depolarization corresponding to a plurality of preset characteristic information intervals;

[0011] obtain characteristic information of the battery when it is monitored that the battery is in a polarization state;

[0012] select, based on the characteristic information, the standard duration matching the characteristic information from the standard duration information;

[0013] perform depolarization on the battery according to the standard duration.

[0014] In another embodiment of the present application, a standard duration determination device for battery depolarization is provided. The device comprises:

[0015] an obtaining module configured to obtain characteristic information of a plurality of sample batteries within a preset duration; the preset duration is a length of time backtracking from the moment when the sample battery is under-voltage;

[0016] a determination module configured to determine, based on the characteristic information, actual discharge power and allowable discharge power of the sample battery corresponding to each time within the preset duration; wherein the allowable discharge power is a power at which the battery continuously discharges for a set duration without being under-voltage;

[0017] the determination module is further configured to determine, based on the characteristic information, the actual discharge power and the allowable discharge power, a standard duration of battery depolarization.

[0018] In another embodiment of the present application, a standard duration determination device for battery depolarization is provided. The device comprises:

[0019] a receiving module configured to receive standard duration information of battery depolarization; wherein the standard duration information comprises standard durations of battery depolarization corresponding to a plurality of preset characteristic information intervals;

[0020] an obtaining module configured to obtain characteristic information of the battery when it is monitored that the battery is in a polarization state;

[0021] a selection module configured to select, based on the characteristic information, the standard duration matching the characteristic information from the standard duration information;

[0022] a depolarization module configured to perform depolarization on the battery according to the standard duration.

[0023] In another embodiment of the present application, an electronic device is provided. The electronic device comprises a memory and a processor; wherein,

[0024] The memory is configured to store one or more computer instructions.

[0025] The processor is coupled to the memory and is configured to execute the at least one or more computer instructions to implement the steps in the method for determining a standard duration of battery depolarization provided in the embodiments of the present application.

[0026] In yet another embodiment of the present application, a vehicle is provided. The vehicle includes a battery and an electronic device provided in the embodiments of the present application; the electronic device is configured to implement: when it is monitored that the battery is in a polarized state, obtaining characteristic information of the battery and a corresponding standard duration, and performing depolarization on the battery.

[0027] The technical solution provided in one embodiment of the present application is based on the characteristic information corresponding to the preset duration backtracked from the moment when the sample battery is under voltage shortage, and further determines the actual discharge power and the allowable discharge power of the sample battery at each moment within the preset duration based on the characteristic information, so as to determine the standard duration of battery depolarization based on the characteristic information, the actual discharge power and the required discharge power. As can be seen, the present solution is based on the characteristic information, the actual discharge power and the allowable discharge power of the sample battery to find the optimal standard duration of battery depolarization, and the determined standard duration has high accuracy. Therefore, when the standard duration provided by the present solution is used to analyze whether the battery depolarization is completed, the battery can be fully depolarized, so that the occurrence of battery voltage shortage risk can be effectively eliminated, and the power performance of the battery can be fully utilized.

[0028] The technical solution provided in another embodiment of the present application is based on the received standard duration information containing the standard duration of battery depolarization corresponding to a plurality of preset characteristic information intervals. After detecting that the battery is in a polarized state and obtaining the corresponding characteristic information of the battery, the standard duration matching the characteristic information can be selected from the standard duration information based on the characteristic information, and the battery is depolarized according to the standard duration. The present solution depolarizes the battery according to the standard duration matching the characteristic information of the battery, which can guarantee the full depolarization of the battery, so that the occurrence of battery voltage shortage risk can be effectively eliminated, and the power performance of the battery can be fully utilized. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0030] Figure 1A flowchart of a method for determining a standard duration of battery depolarization is shown.

[0031] Figure 2 A schematic diagram of a correspondence among battery temperature, state of charge, and allowable discharge power is shown.

[0032] Figure 3 A schematic diagram of a principle of a correspondence among battery temperature, state of charge, and standard duration of battery depolarization is shown.

[0033] Figure 4 A flowchart of a method for determining a standard duration of battery depolarization is shown.

[0034] Figure 5 A structural diagram of a device for determining a standard duration of battery depolarization is shown.

[0035] Figure 6 A structural diagram of a device for determining a standard duration of battery depolarization is shown.

[0036] Figure 7 A structural diagram of an electronic device is shown. DETAILED DESCRIPTION

[0037] In the prior art, the standard duration of battery depolarization (i.e., 5s) involved in the standard for determining whether a battery is in a fully depolarized state is determined based on experience, without considering the influence of different temperatures and different states of charge of the battery on the depolarization rate of the battery in actual working conditions of the battery, and thus has low accuracy. To address this problem, the present application provides a method, system, device, equipment, and vehicle for determining a standard duration of battery depolarization, which accurately determines the standard duration of battery depolarization corresponding to different state of charge intervals and different battery temperature intervals.

[0038] To enable personnel skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings.

[0039] In some of the flowcharts described in the specification, claims, and drawings described above, include a plurality of operations that occur in a particular order, these operations can not be executed in the order in which they appear herein or in parallel. The serial numbers of the operations such as 101, 102, etc. are only used to distinguish different operations, and the serial numbers themselves do not represent any execution order. In addition, these flowcharts can include more or fewer operations, and these operations can be executed in sequence or in parallel. It should be noted that the descriptions herein, such as "first", "second", etc., are used to distinguish different messages, devices, modules, etc., and do not represent the order of precedence. Also, the term "or / and" in this application is only a description of the association between the associated objects, which means that there can be three relationships, for example: A or / and B, which means that A can exist alone, A and B exist together, and B alone; The character " / " in this application generally represents a "or" relationship between the front and back associated objects. It should be noted that the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the goods or systems including a series of elements not only include those elements, but also include other elements not explicitly listed, or include elements inherent to such goods or systems. Without more limitations, the element defined by the statement "including a…" does not exclude the presence of another identical element in the goods or system including the element. In addition, each of the following embodiments is only a part of the embodiments of the present application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0040] Before introducing the specific solutions provided by the present application, some proper nouns involved in the present application will be explained.

[0041] 1) Polarization of battery, refers to the phenomenon that the voltage across the battery will be higher than the actual open circuit voltage value of the circuit during the normal discharge or charging process of the battery. According to the reason for forming polarization, the polarization of the battery can be roughly divided into three categories: concentration polarization, electrochemical polarization and ohmic polarization; among them,

[0042] Concentration polarization is due to the fact that the movement rate of lithium metal in the battery is slower than the corresponding electrochemical reaction rate, which causes some chemical reactions related to the battery to be blocked, ultimately affecting the change of the electrode potential of the battery;

[0043] Electrochemical polarization is a phenomenon that causes the positive and negative electrode potentials of the battery to deviate when some chemical reactions in the internal structure of the battery speed up or are blocked;

[0044] Ohmic polarization refers to a kind of polarization phenomenon caused by the resistance of electrolyte and electrode when the current of lithium ion flows through the electrolyte and the current of electron flows through the corresponding electrode. As long as there is current in the circuit, the ohmic polarization of the battery will also exist, and the only way to eliminate the ohmic polarization is to stop discharging / charging. Therefore, the elimination of polarization during the discharging / charging process of the battery is usually for the concentration polarization and the electrochemical polarization.

[0045] Common methods for eliminating polarization include forced elimination, natural elimination, feedback control and changing process parameters. Among them, forced elimination refers to giving the battery a transient negative pulse when using a large current as the discharging / charging current; natural elimination refers to giving the battery a relatively short parking time when needed when using a large current as the discharging / charging current.

[0046] Feedback control refers to continuously monitoring the voltage value between the two ends of the lithium ion battery as a feedback link during the discharging / charging process, which is used to correct the current value in real time and alleviate the polarization phenomenon.

[0047] Since there will be polarization phenomenon in the process of discharging / charging of the battery as long as there is current, it is not practical to completely eliminate all polarization, so the elimination of polarization usually refers to alleviating the polarization phenomenon of the battery until the requirements are met.

[0048] The battery depolarization in the scheme of the present application refers to the process of eliminating the polarization phenomenon of the battery; in the scheme of the present application, the standard duration of battery depolarization corresponding to the polarization phenomenon in the process of discharging the battery is mainly discussed and analyzed; the standard duration of battery depolarization corresponding to the polarization phenomenon in the process of charging the battery is not discussed.

[0049] 2) The allowable discharging power (or continuous discharging allowable power) of the battery refers to the power of the battery when it is continuously discharged at a certain constant power for a set duration (such as 5 min) without voltage drop.

[0050] The method for determining the standard duration of battery depolarization provided in the present application is introduced and explained as follows.

[0051] Figure 1A flowchart of a method for determining a standard duration of battery depolarization is shown. The method provided in this embodiment is mainly used to analyze and determine the standard duration of depolarization required in the discharging process of the battery of an electric vehicle. The execution subject of the method can be an electronic device with logical operation function, which can be a client device or a server device. The client device can be any terminal device such as a mobile phone, a tablet computer, a smart wearable device, etc. The server device can be a commonly used server, a cloud server or a virtual server, etc. The embodiment of the present application does not make specific limitation to this. As shown in Figure 1 the method includes the following steps:

[0052] 101, obtaining feature information of a plurality of sample batteries within a preset duration; the preset duration is the length of time backtracked from the moment when the sample battery is under voltage;

[0053] 102, determining the actual discharging power and the allowable discharging power of the sample battery corresponding to each time within the preset duration based on the feature information; the allowable discharging power is the power of the battery when continuously discharging at a constant power for a set duration without voltage shortage;

[0054] 103, determining the standard duration of battery depolarization based on the feature information, the actual discharging power and the allowable discharging power.

[0055] In practical applications, an electric vehicle (hereinafter referred to as a vehicle) is connected in communication with a cloud platform, and through the cloud platform, many functions such as real-time monitoring, fault diagnosis analysis, parameter optimization, remote calibration, and the like of the electric vehicle are realized. Specifically, the electrical control unit (ECU) in a general vehicle has a wireless communication and Internet service function module to realize communication connection with the cloud platform monitoring control through the wireless communication and Internet service function module. The electrical control unit of the vehicle is responsible for the control of the entire vehicle, and it needs to collect the working condition data of the electric vehicle to provide decision basis for the operation control of the vehicle, wherein the working condition data includes motor state parameters (speed, voltage, current, temperature, etc.), power battery state parameters (voltage, current, temperature, remaining capacity, state of charge (SOC), etc.), driver input signals (such as accelerator pedal opening, brake pedal opening, steering wheel angle), etc.; the electrical control unit packages and uploads the collected working condition data of the electric vehicle to the cloud platform monitoring center according to the specified communication protocol. After receiving the data uploaded by the electrical control unit, the cloud platform monitoring center can display through the monitoring platform to realize remote monitoring of the vehicle, and at the same time store the data in the cloud platform, analyze and judge whether the vehicle has a fault according to the vehicle data, or analyze and calculate according to the long-term accumulated massive data to generate control parameters conforming to the current vehicle state, and finally send a calibration command to the electrical control unit through the monitoring platform to realize remote calibration of the vehicle, and the like. Based on this, in order to obtain the feature information of the plurality of sample batteries required to realize the technical solution provided in the embodiment, the embodiment obtains the working condition data of a plurality of sample vehicles from the cloud platform to obtain the feature information of the plurality of sample batteries from the working condition data. That is, one of the implementable technical solutions of the above-mentioned 101 "obtaining the feature information of the plurality of sample batteries within a preset time length" is:

[0056] 1011. receive the working condition data of a plurality of sample vehicles sent by the cloud device;

[0057] 1012. based on the working condition data, determine the feature information of the plurality of sample batteries within a preset time length.

[0058] In the above, the preset time length refers to the length of time backtracking from the moment when the sample battery has an under-voltage. In specific implementation, the preset time length can be determined according to actual conditions, such as 60 seconds, 80 seconds, 95 seconds, etc., which is not limited here. Based on analysis of a large amount of data, the longest depolarization time length of the battery is generally not more than 90 seconds, so the preset time length finally selected here is 90 seconds.

[0059] In consideration of the fact that the state of charge SOC and the temperature of the battery are the main factors affecting the battery depolarization rate during the battery depolarization process, and the standard for determining that the battery is in a fully depolarized state mentioned in the background art is that the actual discharge power of the battery is less than the preset allowable discharge power and lasts for more than 5 seconds, the actual discharge power of the battery involved in the standard is usually calculated based on the real-time current and voltage corresponding to the battery. Therefore, in the above step 1012, the characteristic information of the plurality of sample batteries within the preset time period determined based on the working condition data can specifically include but is not limited to the state of charge SOC, the temperature of the battery, the current, the voltage and the like generated by the battery within the preset time period. Accordingly,

[0060] In a specific implementable technical solution, the above-mentioned 102 "determining the actual discharge power and the allowable discharge power corresponding to the sample battery at each time within the preset time period based on the characteristic information" can specifically include:

[0061] 1021, determining the current, voltage, state of charge and battery temperature corresponding to the sample battery at each time based on the characteristic information;

[0062] 1022, processing the current and the voltage to obtain the actual discharge power corresponding to the sample battery at each time;

[0063] 1023, in the corresponding relationship of the preset state of charge, battery temperature and allowable discharge power, finding out the allowable discharge power corresponding to the state of charge and the battery temperature corresponding to the sample battery at each time.

[0064] In the above-mentioned 1021, generally, each characteristic parameter (such as the state of charge SOC) contained in the characteristic information carries a corresponding time stamp, so the current, voltage, state of charge SOC and battery temperature corresponding to the sample battery at each time within the preset time period can be determined based on the time stamp.

[0065] In the above-mentioned 1022, the actual discharge power corresponding to the sample battery at each time can be calculated based on the determined current and voltage corresponding to the sample battery at each time according to the discharge power calculation formula, i.e. discharge power = current * voltage.

[0066] The allowable discharge power of the battery in the above 1023 is the power at which the battery continuously discharges at a constant power for a set time without voltage drop, which characterizes the maximum capability of the battery to withstand the discharge power. When the voltage of the battery is too low or too high, it may lead to a decrease in the service life of the battery or even a safety risk. Therefore, the allowable discharge power of the battery is often estimated based on voltage limits. Common methods for estimating the allowable discharge power based on voltage limits include: offline table lookup method, that is, by offline calibration of the allowable discharge power at different state of charge (SOC) and battery temperature, and determining the allowable discharge power of the battery by table lookup in real vehicle operation.

[0067] In the technical solution provided by the embodiment, the allowable discharge power corresponding to the state of charge and the battery temperature of the sample battery at each moment is determined by the above-mentioned table lookup method. Specifically, the correspondence between the state of charge, the battery temperature and the allowable discharge power is preset in the execution subject in advance. In the correspondence, the data of the state of charge SOC and the battery temperature can be numerical values or numerical intervals. When the data of the state of charge SOC and the battery temperature of the sample battery at each moment are known, the allowable discharge power corresponding to the sample battery at each moment can be found from the correspondence. That is, the data of the state of charge SOC interval and the battery temperature interval, such as the data of the state of charge SOC interval and the battery temperature interval, can correspond to the same allowable discharge power. For example, the state of charge is in the interval of 93% to 95% and the battery temperature is in the interval of 21% to 27%, which correspond to the same allowable discharge power of 30 kW.

[0068] Figure 2 An example shows the preset correspondence between the state of charge SOC, the battery temperature and the allowable discharge power. As shown in Figure 2 , when the temperature of the battery is 20℃, the allowable discharge powers corresponding to the state of charge of 0%, 10%, 20%, 30%,..., 90%, 100% of the battery are P 51 , P 52 , P 53 ,..., P 60 . For example, when the battery temperature and the state of charge SOC of the battery are 20℃ and 55.5% respectively, the corresponding allowable discharge power P 56 can be found, and P 56 = 26 kW is read.

[0069] The state of charge SOC of the above battery is a relative value, which refers to the ratio of the remaining discharge capacity of the battery to the rated capacity under certain discharge rate conditions, and can reflect the remaining capacity of the battery. The state of charge SOC is usually expressed in percentage, and the value range is 0-1; when the state of charge SOC=0, it means that the battery is completely discharged and has no remaining capacity; when the state of charge SOC=1, it means that the battery is fully charged. The state of charge SOC of the battery cannot be directly measured, but can only be estimated by the voltage, charge and discharge current, and internal resistance of the battery.

[0070] Based on the actual discharge power, the allowable discharge power, the state of charge SOC and the battery temperature of each sample battery at each time within the preset time length determined in steps 101 and 102, the actual discharge power, the allowable discharge power, the state of charge SOC and the battery temperature of each sample battery at each time are analyzed and processed, that is, the time length required for each sample battery to complete depolarization, and the state of charge interval and battery temperature interval to which the state of charge and battery temperature of the sample battery during depolarization belong, etc. are obtained, and further, the standard time length required for the battery to complete depolarization corresponding to the preset multiple state of charge intervals and multiple battery temperature intervals can also be determined. Here, the standard time length required for the battery to complete depolarization according to the embodiment refers to the standard time length required from the moment when it is determined that the battery is in a polarized state and the elimination of the polarization of the battery is started to the moment when the polarization of the battery is completely eliminated. The state of the battery when the polarization is completely eliminated is considered to be a completely depolarized state. Based on this, in one possible technical solution, the step 103 of determining the standard time length for depolarization of the battery based on the feature information, the actual discharge power and the allowable discharge power can specifically include:

[0071] 1031. For each sample battery in the plurality of sample batteries, the actual discharge power and the allowable discharge power corresponding to the sample battery at each time are analyzed to determine the depolarization time length required for the sample battery to complete depolarization; and based on the depolarization time length and the state of charge and the battery temperature corresponding to the sample battery at each time, the state of charge interval and the battery temperature interval corresponding to the sample battery during depolarization are determined.

[0072] 1032. Based on the depolarization time length of each sample battery in the plurality of sample batteries, and the state of charge interval and the battery temperature interval corresponding to the sample battery during depolarization, the standard time length for the battery to complete depolarization corresponding to the preset multiple state of charge intervals and multiple battery temperature intervals is determined.

[0073] 1031, for each sample battery, time is traced back successively, the size between the actual discharge power corresponding to each time sample battery and the allowable discharge power is compared to determine the depolarization time length used by the sample battery to complete depolarization. In specific implementation, a time length parameter for representing the depolarization time length can be set, and based on the comparison result between the actual discharge power and the allowable discharge power, the time length parameter is increased by one or reset to the initial value (such as zero) to calculate the depolarization time length used by the battery to complete depolarization, until the value of the time length parameter is greater than the set threshold (such as 5s) and the actual discharge power of the current time is greater than or equal to the corresponding allowable discharge power, the calculation is terminated. That is, in a specific implementable technical solution, the "analysis of the actual discharge power and the allowable discharge power corresponding to each time sample battery to determine the time length used by the sample battery" in 1031 can be implemented by the following steps:

[0074] 10311, a time length parameter for representing the depolarization time length is set;

[0075] 10312, starting from the time when the sample battery is under-voltage, the actual discharge power corresponding to the sample battery at the current time is determined whether it is less than the allowable discharge power by tracing back successively;

[0076] 10313, if the actual discharge power is less than the allowable discharge power, the value of the time length parameter is increased by one;

[0077] 10314, if the actual discharge power is greater than or equal to the allowable discharge power, it is determined whether the value of the time length parameter is greater than the first threshold;

[0078] 10315, if the value of the time length parameter is greater than the first threshold, the value of the time length parameter at the current time is taken as the depolarization time length used by the sample battery to complete depolarization;

[0079] 10316, if the value of the time length parameter is less than or equal to the first threshold, the value of the time length parameter is reset to the initial value, so as to continue to execute the operation of determining whether the actual discharge power corresponding to the sample battery at the next time is less than the allowable discharge power to determine the depolarization time length used by the sample battery to complete depolarization.

[0080] In actual implementation, the initial value of the time length parameter can be flexibly determined according to the actual method used, such as 0, 1, 2, etc., which is not limited herein. In the technical solution provided in this embodiment, the initial value of the time length parameter is 0. In the process of determining the time length of battery depolarization by tracing back from the time point at which the sample battery is in an under-voltage state, if the actual discharge power corresponding to the sample battery at the current time point is less than the allowable discharge power, it indicates that the battery is in a depolarization state at the current time point, and the value of the time length parameter can be increased to 1. Conversely, if the actual discharge power corresponding to the sample battery at the current time point is less than the allowable discharge power, it indicates that the battery is in a non-depolarization state at the current time point. When the node at the current time point is determined to be the node at which the battery changes from a depolarization state to a non-depolarization state, in other words, when it is determined that the actual discharge power corresponding to the sample battery at the current time point is greater than or equal to the allowable discharge power, and the actual discharge power corresponding to the sample battery at the previous time point is less than the allowable discharge power, it can be further determined whether the value of the time length parameter at the current time point is greater than a first threshold. In the case where the value of the time length parameter is greater than the first threshold, the calculation of the time length used by the sample battery to complete depolarization is terminated, and the value of the time length parameter at the current time point calculated is taken as the time length used by the sample battery to complete depolarization. Conversely, if the value of the time length parameter is less than the first threshold, the value of the time length parameter is reset to the initial value (such as 0) so as to subsequently perform the operation of determining whether the actual discharge power corresponding to the sample battery at the next time point is less than the allowable discharge power, so as to complete the determination of the time length used by the sample battery to complete depolarization. As can be seen from the above, in the determination process of the time length used by the sample battery to complete depolarization by using the forward tracing method, the calculation termination condition is that the value of the time length parameter at the current time point is greater than the first threshold, and the actual discharge power corresponding to the sample battery at the current time point is greater than or equal to the allowable discharge power. The time length used by the battery to complete depolarization calculated finally is the time length used by the battery to depolarize the nearest time point from the time point at which the sample battery is in an under-voltage state.

[0081] It's important to clarify that the reason for setting the first threshold is that, considering the possibility that the battery may enter undervoltage before depolarization is complete when the remaining battery power (or state of charge) is low, if the first threshold is not set when determining the battery depolarization time using time backwards, the determined battery depolarization time—in other words, the time for the battery depolarization closest to the time the sample battery experienced undervoltage—would not correspond to the time required for a complete battery depolarization process. This would lead to a significant error in the determined time for the battery to complete depolarization. To avoid this, this embodiment, based on prior experience, indicates that the shortest time for a battery to complete a complete depolarization process is approximately 5 seconds. Therefore, the first threshold is set to 5 seconds to ensure the high accuracy of the obtained time for the sample battery to complete depolarization.

[0082] The following example illustrates the specific process of determining the time required for depolarization of the sample battery in this embodiment.

[0083] Assuming the undervoltage time of a sample battery is t, the preset duration is 90s, and the first threshold is 5s, the actual discharge power P of the sample battery at each moment within the preset duration is determined. 实 and allowable discharge power P 许 Let P be the number of the two numbers, respectively, in a forward backtracking manner. 实t P 实t-1 ...P 实t-i ... P 实t-90 , and P 许t P 许t-1 ... P 许t-i ... P 许t-90 Among them, P 实t-i and P 许t-i This represents the actual discharge power P of the sample battery at time i within a preset time period, starting from the time t when the sample battery experiences undervoltage, using a backward-looking approach. 实 and allowable discharge power P 许 .

[0084] The time parameter representing the battery depolarization time is set to T, with an initial value of zero. Starting from the time t when the battery becomes undervoltage, the actual discharge power P of the battery at each time point is successively calculated in a backward-looking manner. 实 and allowable discharge power P 许 Comparative analysis is performed, and at time t, P is determined. 实t <P 许t Then the value of T increases by one, changing from 0 to 1 second; further, and so on, assuming that for time t-1 and t-2, P is determined respectively.实t-1 <P 许t-1 , P 实t-2 <P 许t-2 At t-2, the value of T is changed to 3s; at t-3, it is determined that P 实t-3 ≥ P 许t-3 At this time, the value of T is 3s, which is less than the first threshold (i.e., 5s), and T is reset to 0. Then, the sample battery corresponding to other time points after t-3 is compared and analyzed, and it is determined that P 实 and P 许 At this time, the value of T is 3s, which is less than the first threshold (i.e., 5s), and T is reset to 0. Then, the sample battery corresponding to other time points after t-3 is compared and analyzed, and it is determined that P 实 ≥ P 许 At this time, the value of T is 3s, which is less than the first threshold (i.e., 5s), and T is reset to 0. Then, the sample battery corresponding to other time points after t-3 is compared and analyzed, and it is determined that P 实t-11 <P 许t-11 At this time, the value of T is increased by one, i.e., the value of T is changed from 0 to 1s again. For time points after t-11, such as t-12 to t-20, it is assumed that P 实 <P 许 At t-20, the value of T will be 20s; if it is determined that P 实 ≥ P 许 At this time, the value of T is 20s (greater than 5s), so at this t-21 time point, the calculation of the sample battery depolarization duration is terminated, and the calculated duration of the sample battery to complete depolarization is 20s. Similarly, the duration of other sample batteries to complete depolarization can also be calculated, and the calculation process can be referred to the specific calculation example of the duration of the sample battery to complete depolarization listed above, which will not be repeated here.

[0085] By analyzing the actual discharge power and the allowable power of the sample battery at each time point, the duration of the sample battery to complete the depolarization is determined, and the depolarization time period corresponding to the depolarization of the sample battery is also determined. The upper and lower limits of the depolarization time period are the time points corresponding to the start and end of depolarization, respectively. For example, based on the above example, the depolarization time period corresponding to the depolarization of the sample battery is the time period from t-11 to t-20, which can be represented by the interval [t-11, t-20). The state of charge and battery temperature of the sample battery at each time point in the interval [t-11, t-20), i.e., t-11, t-12, t-13,..., t-19, and t-20, are determined, i.e., the state of charge and battery temperature intervals to which the state of charge and battery temperature of the sample battery belong during the depolarization process are determined. For example, assuming that the state of charge of the sample battery at t-11, t-12, t-13,..., t-19, and t-20 is 10%, 12.5%, 13%, 14%, 14.2%, 15.1%, 17%, 18.5%, 18.7%, and 19.5%, respectively, and the battery temperature is 30.2°C, 28.5°C, 28°C, 27.4°C, 27°C, 26.6°C, 26°C, 24.5°C, 23°C, and 21.5°C, respectively, the state of charge interval corresponding to the depolarization of the sample battery is [10%, 19.5%], and the battery temperature interval is [21.5°C, 30.2°C]. To facilitate subsequent analysis to determine the standard duration of the battery to complete depolarization corresponding to the preset multiple state of charge intervals and multiple battery temperature intervals, the state of charge interval and battery temperature interval corresponding to the depolarization of the sample battery can be further expanded or contracted to ensure consistency with the corresponding preset state of charge interval and battery temperature interval. For example, continuing the above example, the determined state of charge interval [10%, 19.5%] corresponding to the depolarization of the sample battery can be expanded to be consistent with the corresponding preset state of charge interval [10%, 20%], and the battery temperature interval [21.5°C, 30.2°C] corresponding to the depolarization of the sample battery can be expanded or contracted to be consistent with the corresponding preset battery temperature interval [20°C, 30°C]. Thus, the final determined state of charge interval corresponding to the depolarization of the sample battery is [10%, 20%], and the battery temperature interval is [20°C, 30°C]. For specific descriptions of the preset multiple state of charge intervals and multiple temperature intervals, please refer to the relevant content below, which is not repeated here.

[0086] In 1032, the time length of each of the plurality of sample batteries for completing the depolarization, and the corresponding state of charge interval and battery temperature interval during the depolarization are statistically analyzed to determine the distribution of the time length of the battery for completing the depolarization corresponding to the preset plurality of state of charge intervals and plurality of battery temperature intervals. Based on the distribution, the standard time length of the battery for completing the depolarization corresponding to the preset plurality of state of charge intervals and plurality of battery temperature intervals is determined. Specifically,

[0087] In one possible implementation, the step of 1032 of determining the standard time length of the battery for completing the depolarization corresponding to the preset plurality of state of charge intervals and plurality of battery temperature intervals based on the time length of each of the plurality of sample batteries for completing the depolarization, and the corresponding state of charge interval and battery temperature interval during the depolarization can be implemented as follows:

[0088] A11, the time length of each of the plurality of sample batteries for completing the depolarization, and the corresponding state of charge interval and battery temperature interval during the depolarization are statistically analyzed to obtain the time length distribution of the time length of the battery for completing the depolarization corresponding to the preset plurality of state of charge intervals and plurality of battery temperature intervals;

[0089] A12, based on the time length distribution, it is determined whether there is a case that at least one first state of charge interval and at least one first battery temperature interval of the preset plurality of state of charge intervals and plurality of battery temperature intervals correspond to the plurality of time lengths of the depolarization;

[0090] A13, if there is, the longest time length of the plurality of time lengths of the depolarization is taken as the standard time length of the battery for completing the depolarization corresponding to the corresponding state of charge interval and battery temperature interval;

[0091] A14, if there is not, the time length of the depolarization corresponding to the preset plurality of state of charge intervals and plurality of battery temperature intervals obtained by the statistics is directly taken as the standard time length of the battery for completing the depolarization corresponding to the preset plurality of state of charge intervals and plurality of battery temperature intervals.

[0092] In actual implementation, the preset plurality of state of charge intervals and the plurality of battery temperature intervals can be determined according to actual conditions, which are not limited herein. In this embodiment, the battery temperature range selected for analysis is -30°C to 50°C, and the state of charge range is 0% to 100%. The battery temperature range and the state of charge range are divided at intervals of 10°C and 10% respectively, so as to obtain the preset plurality of state of charge intervals and the plurality of battery temperature intervals, i.e., the plurality of state of charge intervals are [0, 10%], (10%, 20%],..., (90%, 100%), and the plurality of temperature intervals are [-30°C, -20°C], (-20°C, -10°C],..., (40°C, 50°C]. The time length distribution results of the time length required by the battery to complete depolarization corresponding to the plurality of state of charge intervals and the plurality of battery temperature intervals can be obtained by statistically analyzing the time length required by each of the plurality of sample batteries to complete depolarization, and the state of charge interval and the battery temperature interval corresponding to the time length. For example, the time length results of the battery required to complete depolarization corresponding to the state of charge interval (10%, 20%] and the battery temperature interval (20°C, 30°C] obtained by statistical analysis can include 15s, 17s, 23s, and the like; and the time length results of the battery required to complete depolarization corresponding to the state of charge interval (40%, 50%] and the battery temperature interval (10°C, 20°C] include 8s.

[0093] Based on the statistical distribution results, the time length required by the battery to complete depolarization corresponding to the state of charge interval (10%, 20%] and the battery temperature interval (20°C, 30°C] has a plurality of depolarization time lengths, i.e., 15s, 17s, and 23s. At this time, the longest time length (i.e., 23s) in 15s, 17s, and 23s can be selected as the standard time length required by the battery to complete depolarization corresponding to the state of charge interval (10%, 20%] and the battery temperature interval (20°C, 30°C]. For the time length results of the battery required to complete depolarization corresponding to the state of charge interval (40%, 50%] and the battery temperature interval (10°C, 20°C], only one time length is included, i.e., 8s. Therefore, the 8s is the standard time length required by the battery to complete depolarization corresponding to the state of charge interval (40%, 50%] and the battery temperature interval (10°C, 20°C].

[0094] Similarly, the standard time length required by the battery to complete depolarization corresponding to the preset other state of charge intervals and other temperature intervals can also be determined. Figure 3 The embodiment specifically shows an example of the standard time length required by the battery to complete depolarization corresponding to the preset plurality of state of charge intervals and the plurality of temperature intervals determined by the example.

[0095] In the case where it is determined based on the statistical distribution result that one state of charge interval and one temperature interval correspond to a plurality of time lengths, the longest time length in the plurality of depolarization time lengths is selected as a standard time length required for the battery to complete depolarization in the state of charge interval and the temperature interval, which can greatly ensure that the determination result has high accuracy when determining whether the battery is in a completely depolarized state according to the standard time length.

[0096] Further, considering the depolarization time lengths used by the plurality of sample batteries to complete depolarization, there may be an abnormal time length, for example, the determined abnormal time length is greater than or longer than a preset time length (such as 90s), which indicates that the sample battery is consistently in a depolarized state within the entire preset time length, that is, the actual discharge power of the sample battery remains less than the allowable discharge power within the entire preset time length, and for such a sample battery, it is impossible to guarantee that the depolarization process is a complete process. Therefore, when determining the standard time length of battery depolarization based on such time length data, the accuracy of the result will be ultimately reduced. To exclude abnormal time lengths, in the case where the time length used by the sample battery to complete depolarization is greater than or equal to a second threshold (such as 90s), it is determined whether the time length is an abnormal time length according to whether the state of charge interval and the battery temperature interval corresponding to the depolarization of the sample battery are the state of charge interval and the battery temperature interval in which undersupply is prone to occur. That is, the technical solution provided in this embodiment can further include the following steps before the statistical analysis of the depolarization time length used by each of the plurality of sample batteries to complete depolarization, and the state of charge interval and the battery temperature interval corresponding to the depolarization:

[0097] A21, determining at least one second state of charge interval and at least one second battery temperature interval in which the battery is prone to undersupply in the plurality of preset state of charge intervals and the plurality of battery temperature intervals;

[0098] A22, determining, for each of the plurality of sample batteries, whether the depolarization time length used by the sample battery to complete depolarization is greater than or equal to a second threshold; the second threshold is greater than the first threshold;

[0099] A23, when the second threshold is greater than or equal to the second threshold, determining whether there is an interval matching the state of charge interval and the battery temperature interval corresponding to the depolarization of the sample battery in the at least one second state of charge interval and the at least one second battery temperature interval;

[0100] A24, discarding the depolarization time length used by the sample battery to complete depolarization when it is determined that there is a matching interval.

[0101] In the above A21, the state of charge and the battery temperature corresponding to the moment when the sample battery is in under-voltage can be statistically analyzed to determine the under-voltage occurrence frequency corresponding to each of the preset plurality of state of charge intervals and the plurality of battery temperature intervals, and the at least one second state of charge interval and the at least one second battery temperature interval prone to causing the battery to be in under-voltage can be determined according to the under-voltage occurrence frequency. That is, one implementation of the above A21 “determining the at least one second state of charge interval and the at least one second battery temperature interval prone to causing the battery to be in under-voltage from the preset plurality of state of charge intervals and the plurality of battery temperature intervals” is as follows:

[0102] A211, determining the state of charge and the battery temperature corresponding to the moment when each of the plurality of sample batteries is in under-voltage based on the feature information;

[0103] A212, statistically analyzing the state of charge and the battery temperature corresponding to the moment when each of the plurality of sample batteries is in under-voltage to determine the under-voltage occurrence frequency corresponding to each of the preset plurality of state of charge intervals and the plurality of battery temperature intervals;

[0104] A213, determining the at least one second state of charge interval and the at least one second battery temperature interval prone to causing the battery to be in under-voltage from the preset plurality of state of charge intervals and the plurality of battery temperature intervals based on the under-voltage occurrence frequency.

[0105] In a specific implementation, the specific implementation process of statistically analyzing the state of charge and the battery temperature corresponding to the moment when each of the plurality of sample batteries is in under-voltage to determine the under-voltage occurrence frequency corresponding to each of the preset plurality of state of charge intervals and the plurality of battery temperature intervals can refer to the prior art, which will not be described here in detail. After the under-voltage occurrence frequency corresponding to each of the preset plurality of state of charge intervals and the plurality of battery temperature intervals is determined, the state of charge interval and the battery temperature interval corresponding to the preset plurality of state of charge intervals and the plurality of battery temperature intervals, whose under-voltage occurrence frequency is greater than a set threshold (for example, 70 times), can be determined as the state of charge interval and the battery temperature interval prone to causing the battery to be in under-voltage.

[0106] In A22 to A23, the second threshold is greater than the first threshold, and the second threshold can be flexibly set according to actual conditions, for example, the second threshold can be equal to a preset time length (such as 90s), or less than the preset time length (such as 85s), and the like, which is not limited here. As long as the second threshold selects a suitable value. When it is determined that the time length for completing the depolarization of a sample battery is greater than or equal to the second threshold, further, if it is determined that the state of charge interval and the battery temperature interval corresponding to the depolarization of the sample battery match one of the state of charge interval and the battery temperature interval in at least one second state of charge interval and at least one second battery temperature interval determined to be prone to causing battery undervoltage, it is considered that the time length for completing the depolarization of the sample battery is an abnormal time length, and the time length for completing the depolarization of the sample battery is discarded. Otherwise, if it is determined that the state of charge interval and the battery temperature interval corresponding to the depolarization of the sample battery do not match any state of charge interval and any battery temperature interval in at least one second state of charge interval and at least one second battery temperature interval determined to be prone to causing battery undervoltage, the time length for completing the depolarization of the sample battery can be retained.

[0107] In summary, the technical scheme provided by the embodiments of the present application is based on the feature information corresponding to the preset time length before the moment when the sample battery is in undervoltage, and further determines the actual discharge power and the allowable discharge power of the sample battery at each moment within the preset time length based on the feature information, so as to determine the standard time length of battery depolarization based on the feature information, the actual discharge power and the required discharge power. Specifically, the determined standard time length of battery depolarization is the standard time length required for the battery to complete depolarization corresponding to the preset plurality of state of charge intervals and the plurality of battery temperature intervals. The determination of the standard time length is based on a large amount of cloud data, which can effectively ensure the accuracy of the standard time length. When the vehicle discharge control device (such as the vehicle controller) judges whether the battery is in a depolarization completion state based on the real-time discharge power of the battery, the allowable discharge power, the battery temperature and the state of charge, and combines the standard time length determined by the present application, the accuracy of the judgment result can be ensured, so that the accurate control of the battery discharge power can be realized based on the judgment result, the occurrence of battery undervoltage risk can be reduced, and the stability of battery operation can be improved.

[0108] Based on the above, the embodiments of the present application also provide a system for determining a standard time length of battery depolarization (no related schematic diagram is shown in the figure). Specifically, the system can include: a cloud device and a client device

[0109] a cloud device configured to collect characteristic data of a plurality of sample batteries and send the characteristic data to a client device; the characteristic data comprises characteristic information of the plurality of sample batteries within a preset time period; the preset time period is a length of time backtracking from a moment when the sample batteries experience an under-voltage;

[0110] a client device configured to receive the characteristic data sent by the cloud device, and obtain characteristic information of the plurality of sample batteries within a preset time period from the characteristic data; based on the characteristic information, determine actual discharge power and allowable discharge power of the sample batteries at each moment within the preset time period; wherein the allowable discharge power is a power at which the battery continuously discharges for a set time period without experiencing an under-voltage; based on the characteristic information, the actual discharge power and the allowable discharge power, determine a standard time period for battery depolarization.

[0111] In a specific implementation, the cloud device can be, but is not limited to, a computer collection deployed in the cloud based on cloud computing. The cloud is composed of a large number of hosts or network servers based on cloud computing, and cloud computing is a super virtual computer composed of a group of loosely coupled computer clusters. The client device can be, but is not limited to, a desktop computer, a tablet computer, a smart phone, a smart wearable device (such as a smart watch), etc.

[0112] Alternatively, in another system for determining a standard time period for battery depolarization provided in the embodiments of the present application (no relevant schematic diagram is shown in the drawings), the system can specifically include a cloud device and a server device; wherein.

[0113] the cloud device is configured to collect characteristic data of a plurality of sample batteries and send the characteristic data to the server device; the characteristic data comprises characteristic information of the plurality of sample batteries within a preset time period; the preset time period is a length of time backtracking from a moment when the sample batteries experience an under-voltage;

[0114] the server device is configured to receive the characteristic data sent by the cloud device, and obtain characteristic information of the plurality of sample batteries within a preset time period from the characteristic data; based on the characteristic information, determine actual discharge power and allowable discharge power of the sample batteries at each moment within the preset time period; wherein the allowable discharge power is a power at which the battery continuously discharges for a set time period without experiencing an under-voltage; based on the characteristic information, the actual discharge power and the allowable discharge power, determine a standard time period for battery depolarization.

[0115] In the above, the server device can be, but is not limited to, a single server, a service machine, a virtual server, etc., and the embodiments do not limit this.

[0116] Alternatively, the cloud device described above can also be used to perform the related steps of determining the labeling duration of battery depolarization while collecting the characteristic data of a plurality of sample batteries. That is, the cloud device is configured to collect characteristic data of a plurality of sample batteries; the characteristic data includes characteristic information of the plurality of sample batteries within a preset time; the preset duration is the length of time backtracking from the moment when the sample battery occurs under-voltage; and the cloud device is further configured to determine the actual discharge power and the allowable discharge power of the sample battery at each time within the preset duration based on the characteristic information of the plurality of sample batteries within the preset time; wherein the allowable discharge power is the power of the battery when continuously discharging at a constant power for a set duration without under-voltage; and determine the standard duration of battery depolarization based on the characteristic information, the actual discharge power and the continuous discharge allowable power. In this case, the client device (or server device) can only be used to send control instructions to the cloud device to make the cloud device start to collect the characteristic data of the sample battery, determine the standard duration of battery depolarization, and other functions according to the control instructions; the control can also control the cloud device to send the determined standard duration of battery depolarization to the vehicle, so that the vehicle can determine whether the battery depolarization is completed based on the standard duration during the battery depolarization process.

[0117] The above is an introduction to the polarization method of the present application from the interaction of how to determine the standard duration of battery depolarization based on sample battery data. After determining the standard duration of battery depolarization based on sample battery data, the standard duration can be sent to the vehicle, so that the vehicle can perform depolarization processing on the battery according to the corresponding standard duration when it monitors that the battery in the vehicle is in a polarization state. Based on this,

[0118] In another embodiment of the present application, a method for determining the standard duration of battery depolarization is also provided. The method provided by the present embodiment is applied to a vehicle, and the execution subject of the method is a processing unit or system in the vehicle, which can be but is not limited to a VCU (Vehicle Control Unit), an ECU (Electronic Control Unit), a BMS (Battery Management System), a charging controller, etc. on the vehicle, and the present embodiment does not limit this. As shown in Figure 4 The method includes the following steps:

[0119] S21, receiving standard duration information of battery depolarization; wherein the standard duration information contains the standard duration of completing depolarization corresponding to a plurality of preset characteristic information intervals of the battery;

[0120] S22, when monitoring that the battery is in a polarization state, acquiring the characteristic information of the battery;

[0121] S23, selecting a standard duration matching the characteristic information from the standard duration information based on the characteristic information;

[0122] S24, performing depolarization on the battery according to the standard duration.

[0123] In S21, the standard duration information of the battery depolarization can be, but is not limited to, sent from the cloud device. After receiving the standard duration information, the vehicle can store the standard duration information locally and call the standard duration information when needed. In a specific implementation, the determination of the standard duration information of the battery depolarization can be made by any one of the client device, the server device, or the cloud device by processing sample battery data. In the case where the standard duration information is obtained by the client device or the server device by processing sample battery data, the client device or the server device can send the standard duration information to the vehicle through the cloud device. Of course, in the case where the client device or the server device can be directly remotely connected with the vehicle, it can also directly send the determined standard duration information to the vehicle without passing through the cloud device. The embodiment does not limit this. The standard duration information includes the standard duration of the battery depolarization corresponding to a plurality of preset characteristic information intervals. Specifically, it can include the standard duration of the battery depolarization corresponding to a plurality of preset state of charge intervals and a plurality of battery temperature intervals. For the specific process of the standard duration information, refer to the content in the related embodiments above, which will not be described in detail here.

[0124] In S22-S24, when the processing unit or system in the vehicle detects that the battery in the vehicle is in a polarization state, the characteristic information of the battery can be obtained, which can include the state of charge of the battery and the battery temperature. Therefore, based on the state of charge of the battery and the battery temperature, the state of charge interval and the battery temperature interval matching the state of charge of the battery and the battery temperature are determined from the standard duration information. The standard duration corresponding to the state of charge interval and the battery temperature interval is the standard duration matching the state of charge of the battery and the battery temperature when the battery is in the polarization state. The battery is depolarized according to the selected standard duration. That is, during the depolarization of the battery, as long as the actual discharge power of the battery is greater than the allowable discharge power and the depolarization duration is greater than or equal to the standard duration, it is determined that the battery is depolarized. Otherwise, the battery is not depolarized, and the depolarization of the battery is continued.

[0125] An embodiment of the present application also provides a standard duration determination device for battery depolarization. The structure of the device is shown in Figure 5 . Specifically, as shown in Figure 5As shown, the apparatus comprises an acquisition module 201 and a determination module 202; wherein,

[0126] The acquisition module 201 is configured to acquire feature information of a plurality of sample batteries within a preset time length; the preset time length is a length of time backtracking from a moment when the sample battery occurs under-voltage;

[0127] The determination module 202 is configured to determine, based on the feature information, actual discharge power and allowable discharge power of the sample battery at each moment within the preset time length; wherein the allowable discharge power is a power at which the battery continuously discharges for a set time length without occurring under-voltage; and the determination module 202 is further configured to determine, based on the feature information, the actual discharge power and the allowable discharge power, a standard time length of battery depolarization.

[0128] Further, the determination module 202, in the process of determining, based on the feature information, actual discharge power and allowable discharge power of the sample battery at each moment within the preset time length, is specifically configured to: determine, based on the feature information, current, voltage, state of charge and battery temperature of the sample battery at each moment; process the current and voltage to obtain actual discharge power of the sample battery at each moment; and find, in a preset correspondence relationship among state of charge, battery temperature and allowable discharge power, the allowable discharge power corresponding to the state of charge and battery temperature of the sample battery at each moment.

[0129] Further, the determination module 202, in the process of determining, based on the feature information, the actual discharge power and the allowable discharge power, a standard time length of battery depolarization, is specifically configured to:

[0130] For each sample battery in the plurality of sample batteries, the actual discharge power and the allowable discharge power of the sample battery at each moment are analyzed to determine a depolarization time length required for the sample battery to complete depolarization; and based on the depolarization time length and the state of charge and battery temperature of the sample battery at each moment, a corresponding state of charge interval and battery temperature interval of the sample battery during depolarization are determined.

[0131] Based on the depolarization time length required for each of the plurality of sample batteries to complete depolarization, and the corresponding state of charge interval and battery temperature interval during depolarization, a standard time length of the battery to complete depolarization corresponding to a plurality of preset state of charge intervals and a plurality of battery temperature intervals is determined.

[0132] Further, the determination module 202, in the process of determining the depolarization time length of the sample battery, is specifically configured to:

[0133] setting a time length parameter for representing the depolarization time length;

[0134] starting from the time point of the sample battery voltage drop, tracing back to the current time point, determining whether the actual discharge power of the sample battery at the current time point is less than the allowable discharge power;

[0135] if the actual discharge power is less than the allowable discharge power, increasing the value of the time length parameter by one;

[0136] if the actual discharge power is greater than or equal to the allowable discharge power, determining whether the value of the time length parameter is greater than a first threshold value;

[0137] if the value of the time length parameter is greater than the first threshold value, taking the value of the time length parameter at the current time point as the depolarization time length of the sample battery;

[0138] if the value of the time length parameter is less than or equal to the first threshold value, resetting the value of the time length parameter to an initial value, so as to continue to determine whether the actual discharge power of the sample battery at the next time point is less than the allowable discharge power, and determine the depolarization time length of the sample battery.

[0139] Further, the determination module 202, in the process of determining the standard depolarization time length of the battery corresponding to the preset plurality of state of charge intervals and plurality of battery temperature intervals based on the depolarization time length of each of the plurality of sample batteries, and the corresponding state of charge interval and battery temperature interval during depolarization, is specifically configured to:

[0140] counting the depolarization time length of each of the plurality of sample batteries, and the corresponding state of charge interval and battery temperature interval during depolarization, to obtain a time length distribution result of the depolarization time length corresponding to the preset plurality of state of charge intervals and plurality of battery temperature intervals;

[0141] based on the time length distribution result, determining whether there is a case that a plurality of depolarization time lengths correspond to at least one first state of charge interval and at least one first battery temperature interval in the preset plurality of state of charge intervals and plurality of temperature intervals;

[0142] if there is, taking the longest time length in the plurality of depolarization time lengths as the standard depolarization time length of the battery corresponding to the corresponding state of charge interval and battery temperature interval.

[0143] If not, directly taking the depolarization time corresponding to the preset plurality of state of charge intervals and plurality of battery temperature intervals as the standard time length of the battery corresponding to the preset plurality of state of charge intervals and plurality of battery temperature intervals.

[0144] Further, the determination module 202 is further configured to:

[0145] determine at least one second state of charge interval and at least one second battery temperature interval in the preset plurality of state of charge intervals and plurality of battery temperature intervals, which are prone to causing the battery to be under-voltage;

[0146] For each of the plurality of sample batteries, determine whether the time length for the sample battery to complete depolarization is greater than or equal to a second threshold value; the second threshold value is greater than the first threshold value;

[0147] When greater than or equal to the second threshold value, determine whether there is an interval in the at least one second state of charge interval and at least one second battery temperature interval that matches the state of charge interval and battery temperature interval corresponding to the sample battery depolarization;

[0148] When it is determined that there is a matching interval, discard the time length for the sample battery to complete depolarization.

[0149] Further, when determining the at least one second state of charge interval and at least one second temperature interval in the preset plurality of state of charge intervals and plurality of battery temperature intervals, which are prone to causing the battery to be under-voltage, the determination module 202 is specifically configured to: based on the feature information, determine the state of charge and battery temperature corresponding to the time when each of the plurality of sample batteries is under-voltage; based on the state of charge and battery temperature corresponding to the time when each of the plurality of sample batteries is under-voltage, determine the number of under-voltage occurrences corresponding to the preset plurality of state of charge intervals and plurality of battery temperature intervals; based on the number of under-voltage occurrences, determine the at least one second state of charge interval and at least one second battery temperature interval in the preset plurality of state of charge intervals and plurality of battery temperature intervals, which are prone to causing the battery to be under-voltage.

[0150] It should be noted that: the battery depolarization standard time length determination device provided by the above embodiment can implement the technical solutions described in the method embodiments shown in the above Figure 1 The principles of implementation of each module or unit can be referred to the corresponding content in the above method embodiments, and will not be described here.

[0151] An embodiment of the present application also provides a battery depolarization standard time length determination device, the structure of the device is as shown in Figure 6The structure shown. Specifically, as... Figure 6 As shown, the device includes:

[0152] The receiving module 31 is used to receive standard duration information of battery depolarization; wherein, the standard duration information includes the standard duration for the battery to complete depolarization corresponding to multiple preset feature information intervals;

[0153] The acquisition module 32 is used to acquire the characteristic information of the battery when it is detected that the battery is in a polarized state;

[0154] Selection module 33 is used to select a standard duration that matches the feature information from the standard duration information based on the feature information;

[0155] Depolarization module 34 is used to perform depolarization on the battery according to the standard duration.

[0156] It should be noted that the battery depolarization standard duration determination device provided in the above embodiments can achieve the above... Figure 4 The technical solutions described in the method embodiments shown above, and the specific implementation principles of each module or unit can be found in the corresponding content of each method embodiment above, and will not be repeated here.

[0157] Another embodiment of this application provides an electronic device. The electronic device has the following structure: Figure 7 The structure shown. Specifically, as Figure 7 As shown, the vehicle includes a memory 301 and a processor 302. The memory 301 stores one or more computer instructions; the processor 302, coupled to the memory 301, executes the one or more computer instructions (such as computer instructions for implementing data storage logic) to achieve the above-mentioned... Figure 1 The steps in the method for determining the standard duration of battery depolarization are shown; or the steps in the method for determining the standard duration of battery depolarization are shown. Figure 4 The steps in the method for determining the standard duration of battery depolarization are shown in the figure.

[0158] The aforementioned memory 301 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk or optical disk.

[0159] Furthermore, such as Figure 7 As shown, the electronic device also includes other components such as a communication component 305, a display 304, and a power supply component 303. Figure 7The partial components are only schematically shown and do not mean that the electronic device only includes Figure 7 The components shown.

[0160] The present application also provides a vehicle (not shown in the drawings) in an embodiment. The vehicle can include a battery and an electronic device as provided in the embodiment. The electronic device includes a memory and a processor; the memory is configured to store one or more computer instructions; the processor is coupled to the memory and is configured to execute the one or more computer instructions to achieve: when it is monitored that the battery is in a polarization state, obtaining the characteristic information of the battery and the corresponding standard duration, and performing depolarization on the battery. Specifically, the processor is configured to achieve:

[0161] receiving standard duration information of battery depolarization; wherein the standard duration information contains the standard duration of the battery completing depolarization corresponding to a plurality of preset characteristic information intervals;

[0162] When it is monitored that the battery is in a polarization state, obtaining the characteristic information of the battery;

[0163] Based on the characteristic information, selecting the standard duration matching the characteristic information from the standard duration information;

[0164] Performing depolarization on the battery according to the standard duration.

[0165] In addition to the battery, memory, processor and other components, the above vehicle can also include other components, such as respective sensors, such as image sensors, radars, etc., traveling components, sound box components, display components, suspensions, etc., which are not limited here. For the specific structure of the vehicle, please refer to the existing content.

[0166] The present application also provides a computer program product (no corresponding drawings are shown in the drawings) in an embodiment. The computer program or instructions of the computer program product, when executed by a processor, enable the processor to achieve the steps in the above method embodiments.

[0167] Correspondingly, the present application also provides a computer readable storage medium storing a computer program, which is executed by a computer to achieve the method steps or functions provided in the above embodiments.

[0168] The device embodiments described above are merely illustrative, wherein the units described as separate components can or can not be physically separate, and the components displayed as units can or can not be physical units, i.e., can be located in one place, or can be distributed to multiple network units. Part or all of the modules can be selected to achieve the purposes of the embodiments according to actual needs. Those skilled in the art can understand and implement without creative labor.

[0169] Through the description of the above embodiments, those skilled in the art can clearly understand that the embodiments can be realized by means of software and the necessary general hardware platform, and of course can also be realized by hardware. Based on such understanding, the above technical solutions can be embodied in the form of software products, and the computer software products can be stored in a computer readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and include a plurality of instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute the methods described in each embodiment or some parts of the embodiments.

[0170] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for determining the standard duration of battery depolarization, characterized in that, include: Acquire feature information of multiple sample batteries within a preset time period; The preset duration is the length of time that is traced back from the moment when the sample battery experienced undervoltage. Based on the aforementioned feature information, the actual discharge power and allowable discharge power of the sample battery at each moment within the preset time period are determined; wherein, the allowable discharge power is the power at which the battery can continuously discharge at a constant power for a set time without experiencing undervoltage. Based on the feature information, the actual discharge power, and the allowable discharge power, the standard duration for battery depolarization is determined.

2. The method according to claim 1, characterized in that, Based on the aforementioned feature information, the actual discharge power and allowable discharge power of the sample battery at each moment within the preset time period are determined, including: Based on the aforementioned feature information, the current, voltage, state of charge, and battery temperature of the sample battery at each moment are determined. The current and voltage are processed to obtain the actual discharge power of the sample battery at each moment; In the preset correspondence between state of charge, battery temperature and allowable discharge power, find the allowable discharge power corresponding to the state of charge and battery temperature of the sample battery at each time moment.

3. The method according to claim 2, characterized in that, Based on the aforementioned feature information, the actual discharge power, and the allowable discharge power, the standard duration for battery depolarization is determined, including: For each of the multiple sample batteries, the actual discharge power and the allowable discharge power of the sample battery at each time moment are analyzed to determine the depolarization time required for the sample battery to complete depolarization; and based on the depolarization time and the state of charge and battery temperature of the sample battery at each time moment, the state of charge range and battery temperature range corresponding to the depolarization of the sample battery are determined. Based on the depolarization time of each of the sample batteries, and the state of charge interval and battery temperature interval corresponding to the depolarization, the standard time for the battery to complete depolarization for the preset state of charge interval and battery temperature interval is determined.

4. The method according to claim 3, characterized in that, The analysis of the actual discharge power and the allowable discharge power of the sample battery at each time moment to determine the depolarization time required for the sample battery to complete depolarization includes: Set a duration parameter to characterize the depolarization duration; Starting from the moment when the sample battery is undervoltage, backtrack sequentially to determine whether the actual discharge power of the sample battery at the current moment is less than the allowable discharge power; If the actual discharge power is less than the allowable discharge power, the value of the duration parameter is increased by one; If the actual discharge power is greater than or equal to the allowable discharge power, determine whether the value of the duration parameter is greater than the first threshold. If the value of the duration parameter is greater than the first threshold, the value of the duration parameter at the current moment shall be used as the depolarization duration used by the sample battery to complete depolarization. If the value of the duration parameter is less than or equal to the first threshold, the value of the duration parameter is reset to the initial value so that the operation of determining whether the actual discharge power of the sample battery at the next moment is less than the allowable discharge power can be performed to determine the depolarization duration used by the sample battery to complete depolarization.

5. The method according to claim 4, characterized in that, The step of determining the standard time for a battery to complete depolarization for a preset set of multiple state-of-charge intervals and multiple battery temperature intervals, based on the depolarization time of each of the multiple sample batteries, and the corresponding state-of-charge interval and battery temperature interval during depolarization, includes: The depolarization time, the state of charge interval and the battery temperature interval corresponding to the depolarization of each of the multiple sample batteries are statistically analyzed to obtain the duration distribution results of the depolarization time corresponding to the multiple preset state of charge intervals and multiple battery temperature intervals. Based on the duration distribution results, determine whether there exists a situation where at least one first state of charge interval and at least one first battery temperature interval among the preset multiple state of charge intervals and multiple temperature intervals correspond to multiple depolarization durations; If present, the longest of the multiple depolarization durations shall be taken as the standard duration for the battery to complete depolarization for the corresponding state of charge range and battery temperature range. If not, the depolarization time corresponding to the preset multiple states of charge intervals and multiple battery temperature intervals obtained through statistics is directly used as the standard time for the battery to complete depolarization for the preset multiple states of charge intervals and multiple battery temperature intervals.

6. The method according to claim 5, characterized in that, Before statistically analyzing the depolarization time, the corresponding state of charge range, and the battery temperature range for each of the multiple sample batteries, the method further includes: Determine at least one second state of charge interval and at least one second battery temperature interval from among the preset plurality of state of charge intervals and plurality of battery temperature intervals that are prone to causing battery undervoltage. For each of the plurality of sample batteries, determine whether the depolarization time required for the sample battery to complete depolarization is greater than or equal to a second threshold; the second threshold is greater than the first threshold; When the value is greater than or equal to the second threshold, determine whether there is an interval in the at least one second state of charge interval and the at least one second battery temperature interval that matches the state of charge interval and battery temperature interval corresponding to the depolarization of the sample battery; When a matching interval is determined, the depolarization time used by the sample battery to complete the depolarization is discarded.

7. The method according to claim 6, characterized in that, The step of determining at least one second state of charge range and at least one second temperature range that are prone to causing battery undervoltage among the preset plurality of state of charge ranges and plurality of battery temperature ranges includes: Based on the aforementioned feature information, the state of charge and battery temperature corresponding to the time when each of the sample batteries experienced undervoltage were determined. The state of charge and battery temperature corresponding to the time when each of the multiple sample batteries experiences undervoltage are statistically analyzed to determine the number of undervoltage occurrences corresponding to the preset multiple state of charge intervals and multiple battery temperature intervals. Based on the number of undervoltage occurrences, at least one second state of charge interval and at least one second battery temperature interval are determined from among the preset plurality of state of charge intervals and plurality of battery temperature intervals that are prone to causing battery undervoltage.

8. A method for determining the standard duration of battery depolarization, characterized in that, include: Receive standard duration information for battery depolarization; wherein, the standard duration information includes the standard duration for the battery to complete depolarization corresponding to multiple preset feature information intervals; When the battery is detected to be in a polarized state, the characteristic information of the battery is acquired; Based on the feature information, the standard duration that matches the feature information is selected from the standard duration information; Depolarization is performed on the battery for the specified standard duration; The standard duration for completing depolarization is determined as follows: Acquire feature information of multiple sample batteries within a preset time period; the preset time period is the length of time to trace back from the moment when the sample battery experiences undervoltage. Based on the aforementioned feature information, the actual discharge power and allowable discharge power of the sample battery at each moment within the preset time period are determined; wherein, the allowable discharge power is the power at which the battery can continuously discharge at a constant power for a set time without experiencing undervoltage. Based on the feature information, the actual discharge power, and the allowable discharge power, the standard duration for battery depolarization is determined.

9. A device for determining the standard duration of battery depolarization, characterized in that, include: The acquisition module is used to acquire feature information of multiple sample batteries within a preset time period; The preset duration is the length of time that is traced back from the moment when the sample battery experienced undervoltage. The determination module is used to determine the actual discharge power and allowable discharge power of the sample battery at each moment within the preset time period based on the feature information; wherein, the allowable discharge power is the power at which the battery can continuously discharge at a constant power for a set time without undervoltage. The determining module is further configured to determine the standard duration of battery depolarization based on the feature information, the actual discharge power, and the allowable discharge power.

10. A device for determining the standard duration of battery depolarization, characterized in that, include: A receiving module is used to receive standard duration information of battery depolarization; wherein, the standard duration information includes the standard duration for the battery to complete depolarization corresponding to multiple preset feature information intervals; The acquisition module is used to acquire the characteristic information of the battery when it is detected that the battery is in a polarized state; The selection module is used to select a standard duration that matches the feature information from the standard duration information based on the feature information; A depolarization module is used to perform depolarization on the battery for the specified standard duration. The standard duration for completing depolarization is determined as follows: Acquire feature information of multiple sample batteries within a preset time period; the preset time period is the length of time to trace back from the moment when the sample battery experiences undervoltage. Based on the aforementioned feature information, the actual discharge power and allowable discharge power of the sample battery at each moment within the preset time period are determined; wherein, the allowable discharge power is the power at which the battery can continuously discharge at a constant power for a set time without experiencing undervoltage. Based on the feature information, the actual discharge power, and the allowable discharge power, the standard duration for battery depolarization is determined.

11. An electronic device, characterized in that, include: Memory and processor; among which, The memory is used to store one or more computer instructions; The processor, coupled to the memory, is configured to execute one or more computer instructions to implement the steps of the method according to any one of claims 1 to 7, or to implement the steps of the method according to claim 8.

12. A vehicle, characterized in that, The device includes a battery and an electronic device as described in claim 11, wherein the electronic device is configured to: when the battery is detected to be in a polarized state, acquire characteristic information of the battery and the corresponding standard duration, and perform depolarization on the battery.

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