Current determination method, electronic equipment and storage medium

Abstract

The embodiment of the invention discloses a current determination method, electronic equipment and a storage medium. The maximum use current of a target battery at the maximum working temperature is determined based on the initial temperature of the target battery, the pulse time of pulse current to be applied to the target battery and a preset first association relationship; determining the actual discharge capacity of the target battery based on the pulse current and the pulse time; calculating a target pulse voltage based on a preset second association relationship and the pulse current; based on a preset third incidence relation and the target pulse voltage, the battery residual capacity of the target battery is determined, the third incidence relation indicates the incidence relation between the battery charge state and the open-circuit voltage, and the open-circuit voltage is related to the pulse voltage; and predicting the maximum pulse current of the target battery in the target state of charge based on the size relationship between the battery residual capacity and the actual discharge capacity and the maximum use current. Therefore, the maximum pulse current of the battery in different charge states can be accurately calculated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of computer, in particular to a current determination method, an electronic device and a storage medium. BACKGROUND

[0002] In the field of batteries, the maximum pulse current is a core parameter for evaluating the instantaneous power capability, life and safety boundary of the battery, wherein, the maximum pulse current of the battery can be determined by using a Hybrid Pulse Power Characterization (HPPC) method, a JEVS (Japan Electric Vehicle Society) test method and the like.

[0003] In the research and practice process of the prior art, it is found that the existing current determination method does not consider the problem of direct current resistance test deviation caused by the voltage being lower than the minimum voltage (for example, 2.5V) when the battery pulse current is too large during the pulse discharge test under the condition of low State of Charge (SOC), so that the maximum pulse current of the battery under different SOC cannot be accurately determined. SUMMARY

[0004] The embodiments of the present application provide a current determination method, an electronic device and a storage medium, which can accurately predict the maximum pulse current of the battery under different SOC, thereby improving the accuracy of determining the maximum pulse current of the battery.

[0005] The embodiments of the present application provide a current determination method, comprising:

[0006] Based on the initial temperature of the target battery under the target SOC, the pulse time of the pulse current to be applied to the target battery and the preset first correlation relationship, the maximum use current of the target battery under the maximum working temperature is determined, and the first correlation relationship indicates the correlation relationship between the battery current and the temperature rise rate;

[0007] Based on the pulse current and the pulse time, the actual discharge capacity of the target battery is determined;

[0008] Based on the preset second correlation relationship and the pulse current, the target pulse voltage is calculated, and the second correlation relationship indicates the correlation relationship between the battery current and the pulse voltage;

[0009] Based on the preset third correlation relationship and the target pulse voltage, the battery residual capacity of the target battery is determined, the third correlation relationship indicates the correlation relationship between the battery SOC and the open circuit voltage, and the open circuit voltage is related to the pulse voltage;

[0010] predict the maximum pulse current of the target battery at the target state of charge based on the size relationship between the battery residual capacity and the actual discharge capacity and the maximum use current.

[0011] Correspondingly, the application also provides a current determination device, comprising:

[0012] a current determination unit configured to determine the maximum use current of the target battery at the maximum working temperature based on the initial temperature of the target battery at the target state of charge, a pulse time of the pulse current to be applied to the target battery, and a preset first correlation relationship, wherein the first correlation relationship indicates a correlation relationship between battery current and temperature rise rate;

[0013] a first capacity determination unit configured to determine an actual discharge capacity of the target battery based on the pulse current and the pulse time;

[0014] a voltage calculation unit configured to calculate a target pulse voltage based on a preset second correlation relationship and the pulse current, wherein the second correlation relationship indicates a correlation relationship between battery current and pulse voltage;

[0015] a second capacity determination unit configured to determine a battery residual capacity of the target battery based on a preset third correlation relationship and the target pulse voltage, wherein the third correlation relationship indicates a correlation relationship between battery state of charge and open circuit voltage, and the open circuit voltage is related to the pulse voltage;

[0016] a current prediction unit configured to predict the maximum pulse current of the target battery at the target state of charge based on the size relationship between the battery residual capacity and the actual discharge capacity and the maximum use current.

[0017] In an embodiment, the current prediction unit is configured to:

[0018] if the battery residual capacity is not less than the actual discharge capacity, determine the pulse current as the maximum pulse current of the target battery at the target state of charge;

[0019] if the battery residual capacity is less than the actual discharge capacity, adjust the pulse current, wherein the adjusted pulse current is less than the maximum use current, and return to execute the step of determining the actual discharge capacity of the target battery based on the pulse current and the pulse time until the battery residual capacity is not less than the actual discharge capacity, and determine the pulse current corresponding to the condition that the battery residual capacity is not less than the actual discharge capacity as the maximum pulse current of the target battery at the target state of charge.

[0020] Therefore, by adjusting the pulse current applied to the target battery according to the size relationship between the battery residual capacity and the actual discharge capacity, and limiting the adjustment range of the pulse current based on the maximum use current of the target battery, the maximum pulse current of the battery at different states of charge can be accurately determined, and the determination accuracy of the maximum pulse current is improved.

[0021] In an embodiment, the second capacity determination unit is configured to:

[0022] determine a corrected state of charge based on the target pulse voltage and the third preset correlation relationship, wherein the target pulse voltage is used as an open circuit voltage.

[0023] calculate the battery residual capacity corresponding to the target battery based on the total capacity of the target battery and the corrected state of charge.

[0024] Therefore, by using the target pulse voltage as the open circuit voltage, determining the corrected state of charge under the pulse current according to the third correlation relationship and the target pulse voltage, and calculating the battery residual capacity corresponding to the target battery for correcting the capacity loss caused by applying a large current to the battery based on the total capacity of the target battery and the corrected state of charge, the maximum pulse current of the battery at different states of charge can be more accurately determined based on the corrected battery residual capacity.

[0025] In an embodiment, the voltage calculation unit is configured to:

[0026] obtain a second correlation relationship and a target static voltage of the target battery, wherein the second correlation relationship includes a first sub-relationship and a second sub-relationship, the first sub-relationship indicates the correlation relationship between the battery current and the battery transient voltage drop, and the second sub-relationship indicates the correlation relationship between the battery transient voltage drop and the pulse voltage;

[0027] determine the target battery transient voltage drop based on the first sub-relationship and the pulse current;

[0028] calculate the difference between the target static voltage and the target battery transient voltage drop based on the second sub-relationship, and obtain the target pulse voltage corresponding to the target battery.

[0029] Therefore, by determining the pulse voltage according to the correlation relationship between the battery current and the battery transient voltage drop and the correlation relationship between the battery transient voltage drop and the pulse voltage, the pulse voltage can be accurately determined without multiple measurements, the current determination workload is reduced, and the current determination efficiency is further improved.

[0030] In an embodiment, the current determination unit is configured to:

[0031] obtain an initial temperature, a maximum working temperature and a first correlation corresponding to the target battery at a target state of charge;

[0032] calculate a target temperature rising rate corresponding to the target battery based on the initial temperature, the maximum working temperature and a pulse time of a pulse current to be applied to the target battery;

[0033] determine a maximum use current of the target battery at the maximum working temperature based on the target temperature rising rate and the first correlation.

[0034] In this way, the maximum use current of the battery at the maximum working temperature can be accurately determined without multiple measurements according to the preset first correlation, the current determination workload is effectively reduced, and the current determination efficiency is further improved.

[0035] In an embodiment, the current determination apparatus further includes a first relationship determination unit configured to:

[0036] pulse charges and discharges the test battery with currents of multiple preset current values in sequence, and records battery temperature data of each current at different charging or discharging times, wherein the test battery is pulse charged and discharged for the same time length, and the type of the test battery is the same as that of the target battery;

[0037] fits the temperature rising rate of each current based on the battery temperature data of each current at different charging or discharging times;

[0038] determines the first correlation based on the preset current value corresponding to each current and the temperature rising rate.

[0039] In this way, the test battery is pulse charged and discharged with currents of multiple preset current values in sequence, and battery pulse charging and discharging related data is collected, so that the first correlation can be constructed, the maximum use current of the battery at the maximum working temperature can be accurately determined without multiple measurements based on the first correlation constructed in advance, the current determination workload is effectively reduced, and the current determination efficiency is further improved.

[0040] In an embodiment, the current determination apparatus further includes a battery processing unit configured to:

[0041] charges the test battery to obtain the test battery in a full charge state;

[0042] discharges the test battery in the full charge state to a preset battery state of charge.

[0043] Therefore, by charging the test battery, discharging the fully charged battery to a preset battery state of charge, and then acquiring the subsequent correlation relationship, the correlation relationship of the battery related characteristics can be accurately obtained, and the inaccurate correlation relationship caused by the battery being unable to be charged can be avoided.

[0044] In an embodiment, the current determination apparatus further comprises a second relationship determination unit, configured to:

[0045] The test battery is sequentially subjected to pulse charging and discharging by using currents with multiple preset current values, and voltage data in the charging or discharging process of each current is recorded, wherein the voltage data comprises static voltage and pulse voltage of the test battery under each current;

[0046] Based on the static voltage and the pulse voltage, the battery instantaneous voltage drop corresponding to each current is calculated.

[0047] Based on the battery instantaneous voltage drop corresponding to each current, a second correlation relationship is fitted.

[0048] Therefore, by sequentially subjecting the test battery to pulse charging and discharging by using currents with multiple preset current values, and collecting battery pulse charging and discharging related data, the second correlation relationship can be constructed, and the pulse current of the battery can be accurately determined without multiple measurements based on the pre-constructed second correlation relationship, thereby effectively reducing the current determination workload and further improving the current determination efficiency.

[0049] In addition, an electronic device is also provided in the embodiments of the present application, which comprises a processor and a memory, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of any one of the current determination methods provided by the embodiments of the present application.

[0050] In addition, a computer readable storage medium is also provided in the embodiments of the present application, which comprises a computer program, and when the computer program is run on an electronic device, the computer program is used to make the electronic device execute the steps of any one of the current determination methods provided by the embodiments of the present application.

[0051] In addition, a computer program product is also provided in the embodiments of the present application, which comprises a computer program stored in a computer readable storage medium; when a processor of an electronic device reads the computer program from the computer readable storage medium, the processor executes the computer program, so that the electronic device executes the steps of any one of the current determination methods provided by the embodiments of the present application.

[0052] The embodiment of the application determines the maximum use current of the target battery at the maximum working temperature based on the initial temperature of the target battery at the target state of charge, the pulse time of the pulse current to be applied to the target battery, and a preset first correlation relationship, the first correlation relationship indicating the correlation relationship between the battery current and the temperature rise rate; determines the actual discharge capacity of the target battery based on the pulse current and the pulse time; calculates the target pulse voltage based on a preset second correlation relationship and the pulse current, the second correlation relationship indicating the correlation relationship between the battery current and the pulse voltage; determines the battery residual capacity of the target battery based on a preset third correlation relationship and the target pulse voltage, the third correlation relationship indicating the correlation relationship between the battery state of charge and the open circuit voltage, the open circuit voltage being related to the pulse voltage; and predicts the maximum pulse current of the target battery at the target state of charge based on the size relationship between the battery residual capacity and the actual discharge capacity and the maximum use current. In this way, the maximum use current of the target battery at the maximum working temperature is calculated according to the first correlation relationship, the actual discharge capacity of the battery under the applied pulse capacity and pulse time is calculated, and the target pulse voltage of the battery is determined according to the second correlation relationship, and then the battery residual capacity corrected based on the relationship between the open circuit voltage and the pulse voltage is estimated according to the third correlation relationship, which estimates the capacity loss of the battery caused by the application of large current. Therefore, the maximum pulse current of the battery at different states of charge can be accurately predicted according to the size relationship between the battery residual capacity and the actual discharge capacity and the limitation of the maximum use current, thereby improving the accuracy of determining the maximum pulse current of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0053] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0054] Figure 1 is an implementation scenario of a current determination method provided in the embodiments of the present application;

[0055] Figure 2 is a flowchart of a current determination method provided in the embodiments of the present application;

[0056] Figure 3 is a structural diagram of a current determination device provided in the embodiments of the present application;

[0057] Figure 4 is a structural diagram of an electronic device provided in the embodiments of the present application. DETAILED DESCRIPTION

[0058] With reference to the drawings and embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0059] Meanwhile, in the description of the embodiments of the present application, the terms "first", "second", and the like are used only to distinguish the description, and cannot be understood as indicating or implying relative importance. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more features. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0060] In the field of batteries, the maximum pulse current is a core parameter for evaluating the instantaneous power capability, life, and safety boundary of a battery, wherein the maximum pulse current of the battery can be determined by using a hybrid pulse power characterization (HPPC) method, a JEVS (Japan Electric Vehicle Society) test method, and the like. However, this current determination method does not consider the case of low battery state of charge (SOC), and when the pulse discharge test is performed, the voltage is lower than the minimum voltage (for example, 2.5V) due to the excessively large pulse current of the battery, which causes a direct current resistance test deviation problem, so that the measured maximum pulse current of the battery has an error, and thus the maximum pulse current of the battery at different SOC states cannot be accurately calculated.

[0061] In order to solve the above technical problems in the prior art, the embodiments of the present application provide a current determination method, which calculates the maximum use current of a target battery at a maximum working temperature according to a first correlation relationship, calculates the actual discharge capacity of the battery under the applied pulse electric quantity and pulse time, and determines the target pulse voltage of the battery according to a second correlation relationship, and then estimates the battery remaining capacity which is corrected based on the relationship between the open circuit voltage and the pulse voltage and the capacity loss caused by the large current applied to the battery according to a third correlation relationship, so that the maximum pulse current of the battery at different states of charge can be accurately predicted according to the size relationship between the battery remaining capacity and the actual discharge capacity and the limitation of the maximum use current, thereby improving the accuracy of determining the maximum pulse current of the battery.

[0062] The embodiments of the present application provide a current determination method, an electronic device, and a storage medium. The current determination device can be integrated in an electronic device, which can be a server, a terminal, or other devices, and can also be a related device in an energy storage system.

[0063] The server can be a standalone physical server, a server cluster composed of multiple physical servers, or a distributed system, and can also be a cloud server providing cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communication, middleware services, domain name services, security services, content delivery network (CDN), and basic cloud computing services such as big data and artificial intelligence platforms. The terminal can include but is not limited to a mobile phone, a computer, a smart voice interaction device, a smart home appliance, a vehicle-mounted terminal, an aircraft, and the like. The terminal and the server can be connected directly or indirectly through wired or wireless communication, which is not limited in the present application.

[0064] Please refer to Figure 1 For example, the current determination device is integrated in an electronic device, Figure 1 The implementation scenario of the current determination method provided by the embodiment of the present application is shown in the figure, wherein the electronic device can be a server or a terminal. The electronic device can determine the maximum use current of the target battery at the maximum working temperature based on the initial temperature of the target battery at the target state of charge, the pulse time of the pulse current to be applied to the target battery, and a preset first correlation relationship. The first correlation relationship indicates the correlation between the battery current and the temperature rise rate. Based on the pulse current and the pulse time, the actual discharge capacity of the target battery is determined. Based on the preset second correlation relationship and the pulse current, the target pulse voltage is calculated. The second correlation relationship indicates the correlation between the battery current and the pulse voltage. Based on the preset third correlation relationship and the target pulse voltage, the battery remaining capacity of the target battery is determined. The third correlation relationship indicates the correlation between the battery state of charge and the open circuit voltage. The open circuit voltage is related to the pulse voltage. Based on the size relationship between the battery remaining capacity and the actual discharge capacity, and the maximum use current, the maximum pulse current of the target battery at the target state of charge is predicted.

[0065] It should be noted that Figure 1 The implementation environment scenario of the current determination method shown in the figure is only an example. The implementation environment scenario of the current determination method described in the embodiment of the present application is used to more clearly illustrate the technical solution of the embodiment of the present application, and does not constitute a limitation on the technical solution provided by the embodiment of the present application. Those skilled in the art can know that, with the evolution of data processing and the emergence of new business scenarios, the technical solution provided by the present application is also applicable to similar technical problems.

[0066] The scheme provided by the embodiment of the present application is described in detail through the following embodiments. It should be noted that the description order of the following embodiments does not limit the preferred order of the embodiments.

[0067] The embodiment will be described from the perspective of a current determination device, which can be integrated in an electronic device, which can be a server or a terminal, without limitation by the present application.

[0068] Please refer to Figure 2 , Figure 2 is a flowchart of a current determination method provided by the embodiment of the present application. The current determination method comprises:

[0069] In step 101, based on an initial temperature of a target battery at a target state of charge, a pulse time of a pulse current to be applied to the target battery, and a preset first correlation relationship, a maximum use current of the target battery at a maximum working temperature is determined.

[0070] The first correlation relationship can indicate a correlation relationship between the battery current and the temperature rise rate.

[0071] The target battery can be a battery for which the maximum pulse current is calculated. Optionally, the target battery can be a lithium ion battery. The target state of charge can be a state of charge (SOC) of the target battery, which can be a state of charge before the maximum pulse current is calculated. The initial temperature can be a temperature of the target battery when it is not charging or discharging, or can be a temperature of an environment in which the battery is located. The pulse current can be a pulse current to be applied to the target battery for calculating the maximum pulse current of the target battery, and the pulse time can refer to a duration of a pulse signal of the pulse current. The maximum working temperature can be a maximum temperature acceptable to the target battery during use, which can include a maximum temperature allowed by a cell of the target battery. The maximum working temperature of the battery can refer to an upper limit or lower limit of the temperature of the battery under certain working conditions, and exceeding the temperature can cause the performance of the battery to decrease or cause a safety hazard. The maximum use current can be a maximum useable current of the target battery at the maximum working temperature, i.e., a current of the target battery at the maximum working temperature. The first correlation relationship can be information indicating a relationship between the current of the battery and the temperature rise rate thereof, for example, the first correlation relationship can be a relational expression of a curve fitted based on the current of the battery and the corresponding temperature rate. The temperature rate can be information of a magnitude of change in temperature within a certain time.

[0072] The target temperature rise rate can be a rate at which the target battery rises from the initial temperature to the maximum working temperature under the pulse current.

[0073] The target temperature rise rate can be a rate at which the target battery rises from the initial temperature to the maximum working temperature under the pulse current.

[0074] In this way, according to the preset first correlation relationship, the maximum use current of the battery at the maximum working temperature can be accurately determined without multiple measurements, the current determination workload is effectively reduced, and the current determination efficiency is further improved.

[0075] The target temperature rise rate can be a rate at which the target battery rises from the initial temperature to the maximum working temperature under the pulse current.

[0076] The target temperature rise rate can be a rate at which the target battery rises from the initial temperature to the maximum working temperature under the pulse current.

[0077] In an embodiment, the first correlation relationship can be determined in various ways. For example, a plurality of preset current values can be used to perform pulse charging and discharging on the test battery in turn, and battery temperature data at different charging or discharging times under each current value can be recorded. The pulse charging time and the pulse discharging time of the test battery are the same, and the type of the test battery is the same as that of the target battery. Based on the battery temperature data at different charging or discharging times under each current value, the temperature rise rate of each current value can be fitted. Based on the preset current value and the temperature rise rate corresponding to each current value, the first correlation relationship can be determined.

[0078] The preset current value can be a preset current value used to determine the first correlation relationship. For example, the preset current value can include an electric quantity value of 1 Coulomb (C) to 15 C. The test battery can be a battery used to determine the first correlation relationship. In order to improve the current determination accuracy, the type of the test battery can be the same as that of the target battery, for example, both can be lithium batteries. The battery temperature data can be data including the temperature of each current in the pulse charging and discharging process. The temperature rise rate can be the temperature change rate of each current in the pulse charging and discharging process.

[0079] In this way, by using currents with multiple preset current values to sequentially perform pulse charging and discharging on the test battery, the battery pulse charging and discharging related data can be collected, so as to be used to construct the first correlation relationship. Based on the first correlation relationship constructed in advance, the maximum use current of the battery at the maximum working temperature can be accurately determined without multiple measurements, the current determination workload is effectively reduced, and the current determination efficiency is further improved.

[0080] Optionally, before using currents with multiple preset current values to sequentially perform pulse charging and discharging on the test battery, the test battery can be charged to obtain the test battery in a full charge state; and the test battery in the full charge state is discharged to a preset battery state of charge.

[0081] The preset battery state of charge can be a preset battery state of charge, which can be a state of charge other than 100%. For example, it can include a state of charge of 50% SOC, 60% SOC, 70% SOC, etc. The specific state of charge can be set according to actual conditions.

[0082] In this way, by fully charging the test battery, discharging the fully charged battery to a preset battery state of charge, and then acquiring the subsequent correlation relationship, the correlation relationship of the battery related characteristics can be accurately obtained, and the situation that the correlation relationship is inaccurate due to the battery being unable to be charged can be avoided. If the test is directly performed under the condition that the battery is fully charged, the battery will be unable to be charged, and the determination result of the first correlation relationship will be inaccurate.

[0083] In a specific embodiment, the test battery can be fully charged, and then discharged to a state of 50% SOC, and then the test battery can be sequentially subjected to pulse charging for 30 seconds and pulse discharging for 30 seconds at a current of 1C-15C, and the voltage, temperature and other related data corresponding to each current during the charging or discharging process can be recorded. Among them, sequentially first pulse charging the test battery for 30 seconds, and then pulse discharging the test battery for 30 seconds, the state of charge of the test battery can be considered. Optionally, the pulse discharge related data corresponding to a current of 3C or more can be selected, for example, the battery temperature data of each current during pulse discharging, and then the discharge time and the corresponding temperature rise data can be plotted to fit the temperature rise rate of the test battery, and the relationship between the current and the temperature rise rate can be plotted to fit the current-temperature rise rate formula, that is, the first correlation relationship is obtained.

[0084] In step 102, the actual discharge capacity of the target battery is determined based on the pulse current and the pulse time.

[0085] Among them, the actual discharge capacity can be the actual discharge capacity of the target battery under the pulse current and the pulse time, for example, it can be the actual discharge capacity of the target battery under the pulse current for the pulse time.

[0086] Among them, the actual discharge capacity of the target battery can be determined in various ways based on the pulse current and the pulse time, for example, the product of the pulse current and the pulse time can be calculated to obtain the actual discharge capacity of the target battery.

[0087] In step 103, the target pulse voltage is calculated based on the preset second correlation relationship and the pulse current.

[0088] Among them, the second correlation relationship indicates the correlation relationship between the battery current and the pulse voltage.

[0089] The target pulse voltage can be a pulse voltage formed by the target battery when charging and discharging based on a pulse current. The pulse voltage can also be referred to as a pulse starting voltage. The pulse voltage can refer to a non-continuous signal formed by a sudden change in voltage or current in a very short time. For example, the pulse voltage can be a dynamic voltage value measured across the target battery when the pulse current is applied to the target battery for charging and discharging. The pulse voltage can be the initial voltage during pulse discharging. The pulse voltage is different from the static voltage of the battery in a static state. The pulse voltage reflects the instantaneous response capability and internal polarization state of the battery when the load changes suddenly. The static voltage can refer to the voltage of the battery in a static state before the pulse discharging or charging starts. In the absence of current, the static voltage can also be referred to as the open circuit voltage (OCV). Alternatively, the static voltage can be the voltage of the target battery after being charged by the pulse and then being static for a certain period of time. The certain period of time can be determined according to actual conditions, for example, the certain period of time can be 1 hour, half an hour, etc. The difference between the static voltage and the target pulse voltage is the instantaneous voltage drop of the target battery during pulse charging and discharging. Specifically, the instantaneous voltage drop can be represented as ΔU = U1-U2, where ΔU represents the instantaneous voltage drop, U1 represents the static voltage, and U2 represents the pulse voltage. The instantaneous voltage drop can be used to calculate the direct current resistance (DCR) of the battery.

[0090] The target pulse voltage can be calculated in various ways based on the second preset correlation and the pulse current. For example, the second correlation can include a first sub-correlation and a second sub-correlation. The target static voltage of the target battery can be obtained based on the first sub-correlation and the pulse current. The instantaneous voltage drop of the target battery can be determined based on the first sub-correlation and the pulse current. The difference between the target static voltage and the instantaneous voltage drop of the target battery can be calculated based on the second sub-correlation to obtain the target pulse voltage corresponding to the target battery.

[0091] The target static voltage can be the static voltage of the target battery. The first sub-correlation can indicate the correlation between the battery current and the instantaneous voltage drop of the battery. For example, the first sub-correlation can be a relationship formula taking the battery current and the instantaneous voltage drop of the battery as unknown quantities. The second sub-correlation can indicate the correlation between the instantaneous voltage drop of the battery and the pulse voltage. For example, the second sub-correlation can be that the instantaneous voltage drop of the battery is equal to the difference between the static voltage and the pulse voltage. The instantaneous voltage drop of the battery can be the instantaneous voltage drop of the test battery. The instantaneous voltage drop of the target battery can be the instantaneous voltage drop of the target battery.

[0092] In this way, the pulse voltage can be accurately determined without multiple measurements based on the correlation between the battery current and the instantaneous voltage drop of the battery and the correlation between the instantaneous voltage drop of the battery and the pulse voltage. This reduces the workload of current determination and further improves the efficiency of current determination.

[0093] In a specific embodiment, the test battery can be subjected to pulse charging and discharging by currents of multiple preset current values in sequence, voltage data of each current in the process of charging or discharging can be recorded, the voltage data including static voltage and pulse voltage of the test battery under each current; based on the static voltage and the pulse voltage, the battery instantaneous voltage drop corresponding to each current can be calculated; and based on the battery instantaneous voltage drop corresponding to each current, the second correlation can be fitted.

[0094] The battery instantaneous voltage drop corresponding to each current can be calculated based on the static voltage and the pulse voltage in multiple ways, for example, the static voltage can be subtracted by the corresponding pulse voltage to obtain the battery instantaneous voltage drop corresponding to each current.

[0095] In this way, by adopting currents of multiple preset current values to sequentially perform pulse charging and discharging on the test battery, and collecting battery pulse charging and discharging related data, the second correlation can be constructed, and based on the second correlation constructed in advance, the pulse current of the battery can be accurately determined without multiple measurements, the current determination workload is effectively reduced, and the current determination efficiency is further improved.

[0096] In a specific embodiment, the test battery can be fully charged, and then discharged to a state of 50% SOC, then the test battery can be subjected to pulse charging and discharging by currents of 1C-15C in sequence for 30 seconds, and voltage, temperature and other related data corresponding to each current in the process of charging or discharging can be recorded. For example, voltage data of each current in the process of pulse discharging can be taken, the current and the corresponding battery instantaneous voltage drop can be plotted to obtain a current-instantaneous voltage drop curve, then a relationship of the current-instantaneous voltage drop curve can be fitted to obtain the second correlation.

[0097] In step 104, the battery remaining capacity of the target battery is determined based on the preset third correlation and the target pulse voltage.

[0098] The third correlation can indicate the correlation between the state of charge of the battery and the open circuit voltage, and the open circuit voltage can be related to the pulse voltage.

[0099] The battery remaining capacity can be the battery capacity remaining in the state of charge of the target battery based on the target pulse voltage, for example, it can be the remaining battery capacity determined by taking the target pulse voltage as the open circuit voltage of the target battery, the third correlation can be the correlation between the state of charge and the open circuit voltage, and the state of charge (SOC) can be the ratio of the available capacity in the battery to the nominal capacity of the battery. The open circuit voltage (OCV) can refer to the potential difference between the positive and negative electrodes of the battery when no current passes through.

[0100] Optionally, the third correlation relationship can be obtained in various ways. For example, the SOC-OCV curve can be used to fit the OCV corresponding to different SOC intervals, so as to obtain the relationship of the OCV-SOC curve, that is, the third correlation relationship.

[0101] The third correlation relationship and the target pulse voltage are used to determine the corrected state of charge. The total capacity of the target battery and the corrected state of charge are used to calculate the battery remaining capacity corresponding to the target battery.

[0102] The corrected state of charge can be a state of charge that compensates for the capacity loss caused by applying a large current to the battery. The battery remaining capacity can be a battery capacity that corrects the capacity loss caused by applying a large current to the battery. The total capacity of the battery can be the rated capacity of the target battery.

[0103] The total capacity of the target battery and the corrected state of charge are used to calculate the battery remaining capacity corresponding to the target battery. For example, the product of the total capacity of the target battery and the corrected state of charge can be calculated to obtain the battery remaining capacity corresponding to the target battery.

[0104] In the battery capacity calculation, the open-circuit voltage and other related data are often collected and obtained under small current or no current. In the maximum pulse current calculation, a large pulse current is often applied to the battery, which causes irreversible capacity loss of the battery, resulting in large deviation of the calculated battery discharge capacity and other related data, and thus the determined maximum pulse current is inaccurate. Therefore, in order to correct the irreversible capacity loss caused by the large current applied to the battery, the target pulse voltage of the target battery under the pulse current can be determined, and the target pulse voltage is used as the open-circuit voltage. The third correlation relationship and the target pulse voltage are used to determine the corrected state of charge under the pulse current. The total capacity of the target battery and the corrected state of charge are used to calculate the battery remaining capacity corresponding to the target battery, which corrects the capacity loss caused by the large current applied to the battery. Based on the corrected battery remaining capacity, the maximum pulse current of the battery under different states of charge can be more accurately determined.

[0105] In step 105, the maximum pulse current of the target battery under the target state of charge is predicted based on the size relationship between the battery remaining capacity and the actual discharge capacity, and the maximum use current.

[0106] The maximum pulse current can be a current that the target battery can withstand without causing permanent damage, and can include at least one of a maximum pulse discharge current and a maximum pulse charge current. The maximum pulse current can be applicable to a battery of the same type as the target battery.

[0107] The maximum pulse current of the target battery at the target state of charge can be predicted in various ways based on the size relationship between the battery remaining capacity and the actual discharge capacity and the maximum use current. For example, if the battery remaining capacity is not less than the actual discharge capacity, the pulse current can be determined as the maximum pulse current of the target battery at the target state of charge. If the battery remaining capacity is less than the actual discharge capacity, the pulse current is adjusted, the adjusted pulse current is less than the maximum use current, and the step of determining the actual discharge capacity of the target battery based on the pulse current and the pulse time is performed again until the battery remaining capacity is not less than the actual discharge capacity. The pulse current corresponding to the condition that the battery remaining capacity is not less than the actual discharge capacity is determined as the maximum pulse current of the target battery at the target state of charge.

[0108] The battery remaining capacity is the amount of power remaining in the target battery at the SOC estimated based on the target pulse voltage, and the actual discharge capacity is the amount of power that the target battery needs to discharge when the pulse current is applied to the target battery for the pulse time. Therefore, if the battery remaining capacity is less than the actual discharge capacity, it can indicate that the currently applied pulse current is too large and greater than the maximum pulse current of the target battery, and the pulse current needs to be adjusted to be smaller. The battery remaining capacity and the actual discharge capacity are determined again until the battery remaining capacity is not less than the actual discharge capacity. At the same time, the maximum pulse current also needs to be less than the maximum use current to avoid the operating temperature of the target battery exceeding the maximum operating temperature. When the battery remaining capacity is not less than the actual discharge capacity and the currently applied pulse current is less than the maximum use current, it can indicate that the currently applied pulse current can be used as the maximum pulse current of the target battery. If the battery remaining capacity is not less than the actual discharge capacity at the beginning, and the currently applied pulse current is less than the maximum use current, the pulse current applied to the target battery can be increased, and the battery remaining capacity and the actual discharge capacity are determined again. When the battery remaining capacity is less than the actual discharge capacity, the pulse current before the adjustment can be determined as the maximum pulse current.

[0109] In this way, by adjusting the pulse current applied to the target battery according to the size relationship between the battery remaining capacity and the actual discharge capacity, and limiting the adjustment range of the pulse current based on the maximum use current of the target battery, the maximum pulse current of the battery at different states of charge can be accurately determined, and the accuracy of the calculated maximum pulse current can be improved.

[0110] In an embodiment, the maximum pulse current of the battery at different SOC can be obtained based on the current determination method provided in the embodiments of the present application, so that the current MAP table of the battery can be made. The current MAP table is a two-dimensional lookup table model for dynamically adjusting the charging and discharging current of the battery based on the state parameters of the battery (such as temperature, SOC, etc.), and is mainly used in the battery management system (BMS) to ensure that the battery operates within the safe power range. Optionally, an example of a table header of a current MAP table can be referred to Table 1.

[0111]

[0112] Table 1

[0113] In this way, by using the current determination method provided in the embodiments of the present application, the current MAP table of the battery cell can be accurately obtained without a large number of tests, and the manufacturing efficiency of the current MAP table is effectively improved.

[0114] As can be seen from the above, in the embodiments of the present application, the maximum use current of the target battery at the maximum working temperature is determined based on the initial temperature of the target battery at the target state of charge, the pulse time of the pulse current to be applied to the target battery, and the first preset correlation relationship, the first correlation relationship indicating the correlation relationship between the battery current and the temperature rise rate; the actual discharge capacity of the target battery is determined based on the pulse current and the pulse time; the target pulse voltage is calculated based on the second preset correlation relationship and the pulse current, the second correlation relationship indicating the correlation relationship between the battery current and the pulse voltage; the battery remaining capacity of the target battery is determined based on the third preset correlation relationship and the target pulse voltage, the third correlation relationship indicating the correlation relationship between the state of charge of the battery and the open circuit voltage, the open circuit voltage being related to the pulse voltage; and the maximum pulse current of the target battery at the target state of charge is predicted based on the size relationship between the battery remaining capacity and the actual discharge capacity and the maximum use current. In this way, by calculating the maximum use current of the target battery at the maximum working temperature according to the first correlation relationship, calculating the actual discharge capacity of the battery under the applied pulse capacity and pulse time, and determining the target pulse voltage of the battery according to the second correlation relationship, and then estimating the battery remaining capacity which is corrected based on the relationship between the open circuit voltage and the pulse voltage to compensate for the capacity loss caused by applying a large current to the battery according to the third correlation relationship, the maximum pulse current of the battery at different states of charge can be accurately predicted based on the size relationship between the battery remaining capacity and the actual discharge capacity and the limitation of the maximum use current, thereby improving the accuracy of determining the maximum pulse current of the battery.

[0115] In order to better implement the above method, the embodiments of the present application further provide a current determination device, which can be integrated in an electronic device, which can be a terminal or a server.

[0116] For example, as shown in FIG. 1, a structure schematic diagram of a current determination device provided by an embodiment of the present application is shown, which can include a current determination unit 201, a first capacity determination unit 202, a voltage calculation unit 203, a second capacity determination unit 204, and a current prediction unit 205, as follows: Figure 3 The current determination unit 201 is configured to determine a maximum use current of the target battery at a maximum working temperature based on an initial temperature of the target battery at a target state of charge, a pulse time of a pulse current to be applied to the target battery, and a preset first correlation relationship, the first correlation relationship indicating a correlation relationship between a battery current and a temperature rise rate.

[0117] The first capacity determination unit 202 is configured to determine an actual discharge capacity of the target battery based on the pulse current and the pulse time.

[0118] The voltage calculation unit 203 is configured to calculate a target pulse voltage based on a preset second correlation relationship and the pulse current, the second correlation relationship indicating a correlation relationship between a battery current and a pulse voltage.

[0119] The second capacity determination unit 204 is configured to determine a battery remaining capacity of the target battery based on a preset third correlation relationship and the target pulse voltage, the third correlation relationship indicating a correlation relationship between a state of charge of a battery and an open circuit voltage, the open circuit voltage being related to the pulse voltage.

[0120] The current prediction unit 205 is configured to predict a maximum pulse current of the target battery at the target state of charge based on a size relationship between the battery remaining capacity and the actual discharge capacity and the maximum use current.

[0121] In an embodiment, the current prediction unit 205 is configured to:

[0122] If the battery remaining capacity is not less than the actual discharge capacity, the pulse current is determined as the maximum pulse current of the target battery at the target state of charge.

[0123] If the battery remaining capacity is less than the actual discharge capacity, the pulse current is adjusted, the adjusted pulse current being less than the maximum use current, and the step of determining the actual discharge capacity of the target battery based on the pulse current and the pulse time is executed again until the battery remaining capacity is not less than the actual discharge capacity, and the pulse current corresponding to the situation when the battery remaining capacity is not less than the actual discharge capacity is determined as the maximum pulse current of the target battery at the target state of charge.

[0124] In an embodiment, the second capacity determination unit 204 is configured to:

[0125]

[0126] ​The target pulse voltage is taken as an open circuit voltage, and a corrected state of charge is determined based on a preset third correlation relationship and the target pulse voltage.

[0127] A battery remaining capacity corresponding to the target battery is calculated based on a total capacity of the target battery and the corrected state of charge.

[0128] In an embodiment, the voltage calculation unit 203 is configured to:

[0129] The second correlation relationship and a target static voltage of the target battery are obtained, and the second correlation relationship includes a first sub-relationship and a second sub-relationship. The first sub-relationship indicates a correlation relationship between the battery current and the battery transient voltage drop, and the second sub-relationship indicates a correlation relationship between the battery transient voltage drop and the pulse voltage.

[0130] The target battery transient voltage drop is determined based on the first sub-relationship and the pulse current.

[0131] A difference between the target static voltage and the target battery transient voltage drop is calculated based on the second sub-relationship, to obtain a target pulse voltage corresponding to the target battery.

[0132] In an embodiment, the current determination unit 201 is configured to:

[0133] An initial temperature, a maximum operating temperature, and a first correlation relationship corresponding to a target battery in a target state of charge are obtained.

[0134] A target temperature rise rate corresponding to the target battery is calculated based on the initial temperature, the maximum operating temperature, and a pulse time of a pulse current to be applied to the target battery.

[0135] A maximum use current of the target battery at the maximum operating temperature is determined based on the target temperature rise rate and the first correlation relationship.

[0136] In an embodiment, the current determination apparatus further includes a first relationship determination unit configured to:

[0137] The test battery is subjected to pulse charging and discharging by using currents with a plurality of preset current values in sequence, and battery temperature data of each current at different charging or discharging times are recorded. The test battery is subjected to pulse charging and pulse discharging for the same time length, and the type of the test battery is the same as that of the target battery.

[0138] The temperature rise rates of the currents are fitted based on the battery temperature data of each current at different charging or discharging times.

[0139] The first correlation relationship is determined based on the preset current values and the temperature rise rates of the currents.

[0140] In an embodiment, the current determination apparatus further includes a battery processing unit configured to:

[0141] charging the test battery to obtain the test battery in a full charged state;

[0142] discharging the test battery in the full charged state to a preset battery state of charge.

[0143] In an embodiment, the current determining apparatus further comprises a second relationship determining unit, configured to:

[0144] adopting the plurality of preset current values to sequentially perform pulse charging and discharging on the test battery, and recording voltage data of each current in the process of charging or discharging, the voltage data comprising static voltage and pulse voltage of the test battery under each current;

[0145] based on the static voltage and the pulse voltage, calculating the battery instantaneous voltage drop corresponding to each current;

[0146] based on the battery instantaneous voltage drop corresponding to each current, fitting to obtain a second correlation relationship.

[0147] As can be seen from the above, in the embodiments of the present application, the current determining unit 201 determines the maximum use current of the target battery at the maximum working temperature based on the initial temperature of the target battery at the target state of charge, the pulse time of the pulse current to be applied to the target battery, and the preset first correlation relationship, the first correlation relationship indicating the correlation relationship between the battery current and the temperature rise rate; the first capacity determining unit 202 determines the actual discharge capacity of the target battery based on the pulse current and the pulse time; the voltage calculating unit 203 calculates the target pulse voltage based on the preset second correlation relationship and the pulse current, the second correlation relationship indicating the correlation relationship between the battery current and the pulse voltage; the second capacity determining unit 204 determines the battery remaining capacity of the target battery based on the preset third correlation relationship and the target pulse voltage, the third correlation relationship indicating the correlation relationship between the battery state of charge and the open circuit voltage, the open circuit voltage being related to the pulse voltage; the current predicting unit 205 predicts the maximum pulse current of the target battery at the target state of charge based on the size relationship between the battery remaining capacity and the actual discharge capacity and the maximum use current. In this way, by calculating the maximum use current of the target battery at the maximum working temperature according to the first correlation relationship, calculating the actual discharge capacity of the battery under the applied pulse current and pulse time, and determining the target pulse voltage of the battery according to the second correlation relationship, and then estimating the battery remaining capacity which is corrected based on the relationship between the open circuit voltage and the pulse voltage to compensate for the capacity loss caused by applying a large current to the battery according to the third correlation relationship, the maximum pulse current of the battery at different states of charge can be accurately predicted according to the size relationship between the battery remaining capacity and the actual discharge capacity and the limitation of the maximum use current, thereby improving the accuracy of determining the maximum pulse current of the battery.

[0148] Correspondingly, the application also provides an electronic device, which can be a terminal or a server.

[0149] As shown in Figure 4 , Figure 4 a structural schematic diagram of an electronic device provided by the application. The electronic device 300 includes a processor 301 having one or more processing cores, a memory 302 having one or more computer readable storage media, and a computer program stored on the memory 302 and executable on the processor. The processor 301 is electrically connected to the memory 302. Those skilled in the art can understand that the structure of the electronic device shown in the figure does not constitute a limitation on the electronic device, and can include more or fewer components than shown, or combine certain components, or different component arrangements.

[0150] The processor 301 is the control center of the electronic device 300, and connects various parts of the entire electronic device 300 through various interfaces and lines, and performs various functions of the electronic device 300 and processes data by running or loading software programs and / or units stored in the memory 302, and calling data stored in the memory 302. The processor 301 can be a processor CPU, a graphics processor GPU, a network processor (NP), etc., and can implement or execute the methods, steps and logic block diagrams disclosed in the embodiments of the application.

[0151] In the embodiments of the application, the processor 301 in the electronic device 300 will load the instructions corresponding to the processes of one or more application programs into the memory 302, and run the application programs stored in the memory 302 by the processor 301, so as to realize various functions, for example:

[0152] Based on the initial temperature of the target battery at the target state of charge, the pulse time of the pulse current to be applied to the target battery, and the preset first correlation relationship, the maximum use current of the target battery at the maximum working temperature is determined, and the first correlation relationship indicates the correlation relationship between the battery current and the temperature rise rate; based on the pulse current and the pulse time, the actual discharge capacity of the target battery is determined; based on the preset second correlation relationship and the pulse current, the target pulse voltage is calculated, and the second correlation relationship indicates the correlation relationship between the battery current and the pulse voltage; based on the preset third correlation relationship and the target pulse voltage, the battery remaining capacity of the target battery is determined, and the third correlation relationship indicates the correlation relationship between the battery state of charge and the open circuit voltage, and the open circuit voltage is related to the pulse voltage; based on the size relationship between the battery remaining capacity and the actual discharge capacity, the maximum pulse current of the target battery at the target state of charge is predicted.

[0153] The scheme can determine the maximum use current of the target battery at the maximum working temperature based on the initial temperature of the target battery at the target state of charge, the pulse time of the pulse current to be applied to the target battery, and a preset first correlation relationship, the first correlation relationship indicating the correlation relationship between the battery current and the temperature rise rate; determine the actual discharge capacity of the target battery based on the pulse current and the pulse time; calculate the target pulse voltage based on a preset second correlation relationship and the pulse current, the second correlation relationship indicating the correlation relationship between the battery current and the pulse voltage; determine the battery remaining capacity of the target battery based on a preset third correlation relationship and the target pulse voltage, the third correlation relationship indicating the correlation relationship between the battery state of charge and the open circuit voltage, the open circuit voltage being related to the pulse voltage; and predict the maximum pulse current of the target battery at the target state of charge based on the size relationship between the battery remaining capacity and the actual discharge capacity and the maximum use current. In this way, by calculating the maximum use current of the target battery at the maximum working temperature according to the first correlation relationship, calculating the actual discharge capacity of the battery under the applied pulse power and pulse time, and determining the target pulse voltage of the battery according to the second correlation relationship, and then estimating the battery remaining capacity corrected based on the relationship between the open circuit voltage and the pulse voltage to compensate for the capacity loss caused by applying a large current to the battery according to the third correlation relationship, the maximum pulse current of the battery at different states of charge can be accurately predicted according to the size relationship between the battery remaining capacity and the actual discharge capacity and the limitation of the maximum use current, thereby improving the accuracy of determining the maximum pulse current of the battery.

[0154] Further, the application program stored in the memory 302 is run to realize various functions, which can also be referred to the description in the foregoing embodiments, and will not be described here.

[0155] The specific implementation of the above operations can be referred to the foregoing embodiments, and will not be described here.

[0156] Optionally, as shown in Figure 4 The electronic device 300 further includes a touch display screen 303, a radio frequency circuit 304, an audio circuit 305, an input unit 306, and a power supply 307. The processor 301 is electrically connected with the touch display screen 303, the radio frequency circuit 304, the audio circuit 305, the input unit 306, and the power supply 307, respectively. Those skilled in the art can understand that the electronic device structure shown in the Figure 4 The electronic device structure shown in the

[0157] The touch display screen 303 can be used to display a graphical user interface and receive operation instructions generated by user acting on the graphical user interface. The touch display screen 303 can include a display panel and a touch panel. The display panel can be used to display information input by the user or provided to the user and various graphical user interfaces of the electronic device, which can be composed of graphics, text, icons, videos and any combination thereof. Optionally, the display panel can be configured in the form of a liquid crystal display (LCD), an organic light-emitting diode (OLED), etc. The touch panel can be used to collect touch operations (such as operations of the user using a finger, a stylus or any suitable object or accessory on or near the touch panel) of the user on or near it and generate corresponding operation instructions, and the operation instructions execute corresponding programs. Optionally, the touch panel can include two parts of a touch detection device and a touch controller. The touch detection device detects the touch position of the user and detects the signals brought by the touch operation and transmits the signals to the touch controller; the touch controller receives the touch information from the touch detection device and converts it into touch coordinates and sends it to the processor 301, and can also receive commands from the processor 301 and execute them. The touch panel can cover the display panel, and when the touch panel detects a touch operation on or near it, it transmits to the processor 301 to determine the type of the touch event, and then the processor 301 provides corresponding visual output on the display panel according to the type of the touch event. In the embodiments of the present application, the touch panel and the display panel can be integrated into the touch display screen 303 to realize the input and output functions. However, in some embodiments, the touch panel and the touch panel can realize the input and output functions as two independent components. That is, the touch display screen 303 can also realize the input function as part of the input unit 306.

[0158] The radio frequency circuit 304 can be used to transceive radio frequency signals to establish wireless communication with network devices or other electronic devices.

[0159] The audio circuit 305 can be used to provide an audio interface between the user and the electronic device through the speaker and the microphone. The audio circuit 305 can convert the received audio data into an electrical signal and transmit it to the speaker, which converts it into a sound signal output; on the other hand, the microphone collects the sound signal and converts it into an electrical signal, which is received by the audio circuit 305 and converted into audio data, and then the audio data is output to the processor 301 for processing, and then transmitted to another electronic device through the radio frequency circuit 304, or output to the memory 302 for further processing. The audio circuit 305 can also include an earphone jack to provide communication between the external earphone and the electronic device.

[0160] The input unit 306 can be configured to receive input target video, and generate keyboard, mouse, joystick, optical or trackball signal input related to user settings and function control.

[0161] The power supply 307 is configured to supply power to each component of the electronic device 300. Optionally, the power supply 307 can be logically connected to the processor 301 through a power management system, so as to realize functions such as management of charging, discharging and power consumption management through the power management system. The power supply 307 can also include one or more than one direct current or alternating current power supply, a recharging system, a power failure detection circuit, a power converter or inverter, a power state indicator and any other components.

[0162] Although Figure 4 The electronic device 300 can also include a camera, a sensor, a wireless fidelity module, a Bluetooth module and the like, which are not shown in the embodiments and will not be described herein.

[0163] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments. It should be noted that the electronic device provided by the embodiments of the present application and the current determination method suitable for the above embodiments belong to the same concept, and the specific implementation process is described in the above method embodiments, which will not be described here.

[0164] It can be learned from the above that the electronic device provided in the embodiments of the present application can determine the maximum use current of the target battery at the maximum working temperature based on the initial temperature of the target battery at the target state of charge, the pulse time of the pulse current to be applied to the target battery, and a preset first correlation relationship, the first correlation relationship indicating the correlation relationship between the battery current and the temperature rise rate; determine the actual discharge capacity of the target battery based on the pulse current and the pulse time; calculate the target pulse voltage based on a preset second correlation relationship and the pulse current, the second correlation relationship indicating the correlation relationship between the battery current and the pulse voltage; determine the battery residual capacity of the target battery based on a preset third correlation relationship and the target pulse voltage, the third correlation relationship indicating the correlation relationship between the state of charge of the battery and the open circuit voltage, the open circuit voltage being related to the pulse voltage; and predict the maximum pulse current of the target battery at the target state of charge based on the size relationship between the battery residual capacity and the actual discharge capacity and the maximum use current. In this way, the maximum use current of the target battery at the maximum working temperature is calculated according to the first correlation relationship, the actual discharge capacity of the battery under the applied pulse capacity and pulse time is calculated, and the target pulse voltage of the battery is determined according to the second correlation relationship, and then the battery residual capacity corrected based on the relationship between the open circuit voltage and the pulse voltage is estimated according to the third correlation relationship, which estimates the capacity loss of the battery caused by the application of a large current. Therefore, according to the size relationship between the battery residual capacity and the actual discharge capacity and the limitation of the maximum use current, the maximum pulse current of the battery at different states of charge can be accurately predicted, thereby improving the accuracy of determining the maximum pulse current of the battery.

[0165] Those of ordinary skill in the art can understand that all or part of the steps of various methods in the above embodiments can be completed by instructions, or by instructions controlling relevant hardware, which can be stored in a computer readable storage medium and loaded and executed by a processor.

[0166] To this end, the embodiments of the present application provide a computer readable storage medium, which includes a computer program. When the computer program is run on an electronic device, the computer program is configured to cause the electronic device to perform any current determination method provided in the embodiments of the present application. For example, the computer program can perform the steps of the current determination method as follows:

[0167] The initial temperature of the target battery at the target state of charge, the pulse time of the pulse current to be applied to the target battery, and a preset first correlation relationship are used to determine a maximum use current of the target battery at a maximum working temperature, the first correlation relationship indicating a correlation relationship between a battery current and a temperature rise rate; the pulse current and the pulse time are used to determine an actual discharge capacity of the target battery; a target pulse voltage is calculated based on a preset second correlation relationship and the pulse current, the second correlation relationship indicating a correlation relationship between the battery current and the pulse voltage; a battery residual capacity of the target battery is determined based on a preset third correlation relationship and the target pulse voltage, the third correlation relationship indicating a correlation relationship between a battery state of charge and an open circuit voltage, the open circuit voltage being related to the pulse voltage; and a maximum pulse current of the target battery at the target state of charge is predicted based on a size relationship between the battery residual capacity and the actual discharge capacity and the maximum use current.

[0168] The initial temperature of the target battery at the target state of charge, the pulse time of the pulse current to be applied to the target battery, and a preset first correlation relationship are used to determine a maximum use current of the target battery at a maximum working temperature, the first correlation relationship indicating a correlation relationship between a battery current and a temperature rise rate; the pulse current and the pulse time are used to determine an actual discharge capacity of the target battery; a target pulse voltage is calculated based on a preset second correlation relationship and the pulse current, the second correlation relationship indicating a correlation relationship between the battery current and the pulse voltage; a battery residual capacity of the target battery is determined based on a preset third correlation relationship and the target pulse voltage, the third correlation relationship indicating a correlation relationship between a battery state of charge and an open circuit voltage, the open circuit voltage being related to the pulse voltage; and a maximum pulse current of the target battery at the target state of charge is predicted based on a size relationship between the battery residual capacity and the actual discharge capacity and the maximum use current. In this way, the maximum use current of the target battery at the maximum working temperature is calculated according to the first correlation relationship, the actual discharge capacity of the battery under the applied pulse current and pulse time is calculated, and the target pulse voltage of the battery is determined according to the second correlation relationship, and then the battery residual capacity corrected based on the relationship between the open circuit voltage and the pulse voltage is estimated according to the third correlation relationship, so that the maximum pulse current of the battery at different states of charge can be accurately predicted according to the size relationship between the battery residual capacity and the actual discharge capacity and the limitation of the maximum use current, thereby improving the accuracy of determining the maximum pulse current of the battery.

[0169] Further, the detailed steps of the above method steps can also refer to the description in the foregoing embodiments, which will not be repeated here.

[0170] The specific implementation of each operation can refer to the foregoing embodiments, which will not be repeated here.

[0171] The computer readable storage medium can include a read only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0172] Due to the computer program stored in the computer readable storage medium, any current determination method provided by the embodiments of the present application can be executed, thus the beneficial effects of any current determination method provided by the embodiments of the present application can be achieved, which will be described in detail in the foregoing embodiments and will not be repeated here.

[0173] According to an aspect of the present application, a computer program product is also provided, which includes a computer program stored in a computer readable storage medium; when a processor of an electronic device reads the computer program from the computer readable storage medium, the processor executes the computer program, so that the electronic device executes the method provided in various optional implementation manners in the foregoing embodiments.

[0174] In the foregoing current determination apparatus, computer readable storage medium, electronic device and computer program product, the description of each embodiment has its own focus, and the parts not described in detail in an embodiment can be referred to the related description of other embodiments. It can be clearly understood by those skilled in the art that, for the convenience and brevity of description, the specific working process of the foregoing described current determination apparatus, computer readable storage medium, computer program product, electronic device and its corresponding units and the beneficial effects brought by them can be referred to the description of the current determination method in the foregoing embodiments, and will not be repeated here.

[0175] The foregoing provides a detailed introduction to the current determination method, apparatus, electronic device, computer readable storage medium and computer program product provided by the embodiments of the present application. The principle and implementation manner of the present application are described by applying specific examples in this paper, and the foregoing embodiment description is only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation manner and application range will be changed, and the foregoing description should not be understood as the limitation of the present application.

Claims

1. A current determination method, characterized by, The method comprises: determining a maximum use current of the target battery at a maximum working temperature based on an initial temperature of the target battery at a target state of charge, a pulse time of a pulse current to be applied to the target battery, and a preset first correlation relationship, the first correlation relationship indicating a correlation relationship between a battery current and a temperature rise rate; determining an actual discharge capacity of the target battery based on the pulse current and the pulse time; calculating a target pulse voltage based on a preset second correlation relationship and the pulse current, the second correlation relationship indicating a correlation relationship between a battery current and a pulse voltage; determining a battery residual capacity of the target battery based on a preset third correlation relationship and the target pulse voltage, the third correlation relationship indicating a correlation relationship between a battery state of charge and an open circuit voltage, the open circuit voltage being related to the pulse voltage; predicting a maximum pulse current of the target battery at the target state of charge based on a size relationship between the battery residual capacity and the actual discharge capacity, and the maximum use current.

2. The current determination method of claim 1, wherein, The prediction of the maximum pulse current of the target battery at the target state of charge based on the size relationship between the battery residual capacity and the actual discharge capacity, and the maximum use current comprises: if the battery residual capacity is not less than the actual discharge capacity, determining the pulse current as the maximum pulse current of the target battery at the target state of charge; if the battery residual capacity is less than the actual discharge capacity, adjusting the pulse current, the adjusted pulse current being less than the maximum use current, and returning to perform the step of determining the actual discharge capacity of the target battery based on the pulse current and the pulse time until the battery residual capacity is not less than the actual discharge capacity, and determining the pulse current corresponding to the situation that the battery residual capacity is not less than the actual discharge capacity as the maximum pulse current of the target battery at the target state of charge.

3. The current determination method of claim 1, wherein, The determination of the battery residual capacity of the target battery based on the preset third correlation relationship and the target pulse voltage comprises: determining a corrected state of charge based on the preset third correlation relationship and the target pulse voltage, taking the target pulse voltage as an open circuit voltage; calculating a battery residual capacity corresponding to the target battery based on a total battery capacity of the target battery and the corrected state of charge.

4. The current determination method of claim 1, wherein, The calculation of the target pulse voltage based on the preset second correlation relationship and the pulse current comprises: obtaining a second correlation relationship and a target static voltage of the target battery, the second correlation relationship comprising a first sub-relationship and a second sub-relationship, the first sub-relationship indicating a correlation relationship between a battery current and a battery instantaneous voltage drop, and the second sub-relationship indicating a correlation relationship between a battery instantaneous voltage drop and a pulse voltage; determining a target battery instantaneous voltage drop based on the first sub-relationship and the pulse current; calculating a difference between the target static voltage and the target battery instantaneous voltage drop based on the second sub-relationship, to obtain a target pulse voltage corresponding to the target battery.

5. The current determination method according to any one of claims 1 to 4, characterized in that, The initial temperature of the target battery at the target state of charge, the pulse time of the pulse current to be applied to the target battery, and the preset first correlation relationship are used to determine a maximum use current of the target battery at a maximum working temperature, including: An initial temperature, a maximum working temperature, and a first correlation relationship corresponding to a target battery at a target state of charge are obtained; Based on the initial temperature, the maximum working temperature, and the pulse time of the pulse current to be applied to the target battery, a target temperature rise rate corresponding to the target battery is calculated; Based on the target temperature rise rate and the first correlation relationship, a maximum use current of the target battery at the maximum working temperature is determined.

6. The current determination method according to any one of claims 1 to 5, characterized in that, The method further includes: A plurality of preset current values are used to sequentially perform pulse charging and discharging on a test battery, and battery temperature data of each current at different charging or discharging times are recorded, wherein the time length of pulse charging and discharging on the test battery is the same, and the type of the test battery is the same as that of the target battery; Based on the battery temperature data of each current at different charging or discharging times, a temperature rise rate of each current is fitted; Based on the preset current value corresponding to each current and the temperature rise rate, a first correlation relationship is determined.

7. The current determination method of claim 6, wherein, Before the plurality of preset current values are used to sequentially perform pulse charging and discharging on the test battery, the method further includes: The test battery is charged to obtain a test battery in a full charge state; The test battery in the full charge state is discharged to a preset battery state of charge.

8. The current determination method according to any one of claims 1 to 5, characterized in that, Further including: A plurality of preset current values are used to sequentially perform pulse charging and discharging on a test battery, and voltage data in the charging or discharging process of each current are recorded, wherein the voltage data include static voltage and pulse voltage of the test battery under each current; Based on the static voltage and the pulse voltage, a battery instantaneous voltage drop corresponding to each current is calculated; Based on the battery instantaneous voltage drop corresponding to each current, a second correlation relationship is fitted.

9. An electronic device, comprising: A processor and a memory are included, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the current determination method in any one of claims 1-8.

10. A storage medium, characterized by A computer program is included, and when the computer program runs on an electronic device, the computer program is used to make the electronic device execute the steps of the current determination method in any one of claims 1-8.

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