CN117621911A

CN117621911A - Battery power control method, apparatus, device, storage medium and program product

Info

Publication number: CN117621911A
Application number: CN202210960567.8A
Authority: CN
Inventors: 李德伟; 郑立奇; 曹文鹏
Original assignee: Shanghai Jusheng Technology Co Ltd
Current assignee: Shanghai Jusheng Technology Co Ltd
Priority date: 2022-08-09
Filing date: 2022-08-09
Publication date: 2024-03-01

Abstract

Embodiments of the present disclosure relate to a battery power control method, apparatus, device, storage medium, and program product. The method comprises the following steps: calculating the accumulated heat of the power battery at the current moment according to the running current of the power battery at the current moment; determining whether an available power switching condition is satisfied based on the accumulated heat; and if the available power switching condition is met, switching the available power of the power battery from the first power to the second power, wherein one of the first power and the second power is peak power, and the other is continuous power. By adopting the method, the influence on the service life of the power battery in the vehicle can be reduced, and the driving safety is ensured.

Description

Battery power control method, apparatus, device, storage medium and program product

Technical Field

The embodiment of the disclosure relates to the technical field of automobile batteries, in particular to a battery power control method, a device, equipment, a storage medium and a program product.

Background

The BMS battery system in the vehicle is used for intelligently managing and maintaining each battery unit, preventing overcharge and overdischarge of the power battery, prolonging the service life of the power battery and monitoring the state of the power battery. SOP (State of Power) is used as a key algorithm in BMS for determining available Power of a Power battery at the current moment in the running process of a vehicle, so that the peak charge and discharge capacity of the Power battery is fully utilized, and meanwhile, over-range output such as overheat, undervoltage, overvoltage and the like of the Power battery is avoided.

In the conventional technology, a smoothing algorithm is generally adopted to implement SOP calculation, and peak power or continuous power is used as available power of a battery at different moments according to the limit of the use duration of the peak power.

However, the power battery generates heat in the actual charge and discharge process, and the battery is overheated, so that in order to avoid overheating of the battery, in the conventional technology, the available power of the battery needs to be reduced by adopting another protection strategy to prevent battery alarming, however, such treatment can reduce the service life of the power battery and even generate overheat alarming, so that the driving safety is affected.

Disclosure of Invention

The embodiment of the disclosure provides a battery power control method, a device, equipment, a storage medium and a program product, which can be used for reducing the influence on the service life of a power battery in a vehicle and ensuring the driving safety.

In a first aspect, an embodiment of the present disclosure provides a battery power control method, including:

calculating the accumulated heat of the power battery at the current moment according to the running current of the power battery at the current moment; determining whether an available power switching condition is satisfied based on the accumulated heat; and if the available power switching condition is met, switching the available power of the power battery from the first power to the second power, wherein one of the first power and the second power is peak power, and the other is continuous power.

In one embodiment, determining whether the available power switching condition is met based on the accumulated heat comprises:

detecting whether the accumulated heat is greater than or equal to a first heat threshold, the first heat threshold being determined based on a maximum allowable accumulated heat of the power cell, if the first power is peak power; in the event that the accumulated heat is detected to be greater than or equal to the first heat threshold, it is determined that the available power switching condition is satisfied.

In one embodiment, the method further comprises: and determining the maximum allowable accumulated heat according to the battery temperature at the current moment of the power battery and the battery charge state at the current moment.

In one embodiment, determining the maximum allowable accumulated heat based on the battery temperature at the current time and the battery state of charge at the current time of the power battery includes: inquiring an allowable accumulated heat meter according to the battery temperature at the current moment of the power battery and the battery state of charge at the current moment, and determining the maximum allowable accumulated heat according to an inquiring result; the allowable accumulated heat meter comprises the corresponding relation between different temperatures and different battery charge states of the power battery and allowable accumulated heat of the power battery, wherein the allowable accumulated heat is obtained according to the difference between the peak heat of the power battery and the continuous heat of the power battery, and the peak heat is obtained according to the peak current and the internal resistance of the power battery; the continuous heat is obtained according to the continuous current and the internal resistance of the power battery, and the continuous current is the current which can normally dissipate heat of the power battery and does not overheat.

In one embodiment, determining whether the available power switching condition is met based on the accumulated heat comprises: detecting whether the accumulated heat is less than or equal to a second heat threshold value, which is less than the first heat threshold value, under the condition that the first power is continuous power; and determining that the available power switching condition is satisfied in the case that the accumulated heat is detected to be less than or equal to the second heat threshold.

In one embodiment, calculating the accumulated heat of the power battery at the current moment according to the running current of the power battery at the current moment comprises: acquiring the running current of the power battery at the current moment, the internal resistance of the power battery at the current moment and the continuous current of the power battery at the current moment; the accumulated heat is calculated based on the current time of operation current, the current time of internal resistance, and the current time of continuous current.

In one embodiment, calculating the accumulated heat based on the current time of operation current, the current time of internal resistance, and the current time of continuous current includes: the square of the running current at the current moment and the square of the continuous current at the current moment are subjected to difference to obtain a first current difference value; multiplying the first current difference value by the internal resistance of the current moment and the preset period duration to obtain a first accumulated heat; adding the first accumulated heat and the second accumulated heat to obtain the accumulated heat; the second accumulated heat is the sum of the accumulated heat of the power battery in a period from the initial time to the preset period.

In one embodiment, the method further comprises: acquiring a battery charge state at the current moment of the power battery, and acquiring the lowest temperature and the highest temperature in the temperatures of all areas at the current moment of the power battery; determining a first candidate continuous current corresponding to the lowest temperature and the current state of charge of the battery; determining a second candidate continuous current corresponding to the maximum temperature and the current state of charge of the battery; and taking the minimum value of the first candidate continuous current and the second candidate continuous current as the continuous current at the current moment.

In one embodiment, when the first power is the peak power, the switching the available power of the power battery from the first power to the second power includes: acquiring a battery charge state at the current moment of the power battery, and acquiring the lowest temperature and the highest temperature in the temperatures of all areas at the current moment of the power battery; determining a first candidate continuous power corresponding to the lowest temperature and the current state of charge of the battery; determining a second candidate continuous power corresponding to the maximum temperature and the current state of charge of the battery; and taking the minimum value of the first candidate continuous power and the second candidate continuous power as the second power.

In one embodiment, in the case that the first power is continuous power, the switching the available power of the power battery from the first power to the second power includes:

acquiring a battery charge state at the current moment of the power battery, and acquiring the lowest temperature and the highest temperature in the temperatures of all areas at the current moment of the power battery; determining a first candidate peak power corresponding to the lowest temperature and the current state of charge of the battery; determining a second candidate peak power corresponding to the maximum temperature and the current state of charge of the battery; the minimum value of the first candidate peak power and the second candidate peak power is taken as the second power.

In a second aspect, embodiments of the present disclosure provide a battery power control apparatus, the apparatus comprising:

the heat calculation module is used for calculating the accumulated heat of the power battery at the current moment according to the running current of the power battery at the current moment;

a first determining module for determining whether an available power switching condition is satisfied based on the accumulated heat;

and the switching module is used for switching the available power of the power battery from the first power to the second power if the available power switching condition is met, wherein one of the first power and the second power is peak power, and the other is continuous power.

In one embodiment, the first determining module is specifically configured to:

In one embodiment, the apparatus further comprises:

and the second determining module is used for determining the maximum allowable accumulated heat according to the battery temperature at the current moment of the power battery and the battery state of charge at the current moment.

In one embodiment, the second determining module is specifically configured to: inquiring an allowable accumulated heat meter according to the battery temperature at the current moment of the power battery and the battery state of charge at the current moment, and determining the maximum allowable accumulated heat according to an inquiring result; the allowable accumulated heat meter comprises the corresponding relation between different temperatures and different battery charge states of the power battery and allowable accumulated heat of the power battery, wherein the allowable accumulated heat is obtained according to the difference between the peak heat of the power battery and the continuous heat of the power battery, and the peak heat is obtained according to the peak current and the internal resistance of the power battery; the continuous heat is obtained according to the continuous current and the internal resistance of the power battery, and the continuous current is the current which can normally dissipate heat of the power battery and does not overheat.

In one embodiment, the first determining module is specifically configured to: detecting whether the accumulated heat is less than or equal to a second heat threshold value, which is less than the first heat threshold value, under the condition that the first power is continuous power; and determining that the available power switching condition is satisfied in the case that the accumulated heat is detected to be less than or equal to the second heat threshold.

In one embodiment, the heat calculation module is specifically configured to: acquiring the running current of the power battery at the current moment, the internal resistance of the power battery at the current moment and the continuous current of the power battery at the current moment; the accumulated heat is calculated based on the current time of operation current, the current time of internal resistance, and the current time of continuous current.

In one embodiment, the heat calculation module is specifically configured to: the square of the running current at the current moment and the square of the continuous current at the current moment are subjected to difference to obtain a first current difference value; multiplying the first current difference value by the internal resistance of the current moment and the preset period duration to obtain a first accumulated heat; adding the first accumulated heat and the second accumulated heat to obtain the accumulated heat; the second accumulated heat is the sum of the accumulated heat of the power battery in a period from the initial time to the preset period.

In one embodiment, the apparatus further comprises:

the first acquisition module is used for acquiring the battery charge state at the current moment of the power battery and acquiring the lowest temperature and the highest temperature in the temperatures of all areas at the current moment of the power battery;

a third determining module configured to determine a first candidate continuous current corresponding to the lowest temperature and the current state of charge of the battery;

a fourth determining module configured to determine a second candidate continuous current corresponding to the highest temperature and the current state of charge of the battery;

and a fifth determining module, configured to take the minimum value of the first candidate persistent current and the second candidate persistent current as the persistent current at the current moment.

In one embodiment, in the case that the first power is a peak power, the switching module is specifically configured to:

acquiring a battery charge state at the current moment of the power battery, and acquiring the lowest temperature and the highest temperature in the temperatures of all areas at the current moment of the power battery; determining a first candidate continuous power corresponding to the lowest temperature and the current state of charge of the battery; determining a second candidate continuous power corresponding to the maximum temperature and the current state of charge of the battery; and taking the minimum value of the first candidate continuous power and the second candidate continuous power as the second power.

In one embodiment, in the case that the first power is continuous power, the switching module is specifically configured to:

In a third aspect, an embodiment of the disclosure provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, where the processor implements the method of the first aspect when the processor executes the computer program.

In a fourth aspect, embodiments of the present disclosure provide a computer-readable storage medium, on which a computer program is stored, which when executed by a processor, implements the method of the first aspect.

In a fifth aspect, embodiments of the present disclosure provide a computer program product comprising a computer program which, when executed by a processor, implements the method of the first aspect described above.

The battery power control method, the device, the equipment, the storage medium and the program product provided by the embodiment of the disclosure can calculate the accumulated heat of the power battery at the current moment according to the running current of the power battery at the current moment, and determine whether the available power switching condition is met according to the accumulated heat; and if the available power switching condition is met, switching the available power of the power battery from the first power to the second power, wherein one of the first power and the second power is peak power, and the other is continuous power. Because the embodiment of the disclosure can determine that the power battery takes peak power as available power according to the accumulated heat of the power battery in the running process of the vehicle, or takes continuous power as available power, the influence of the heat on the power battery is fully considered, the available power of the power battery is directly determined from the accumulated heat according to the available power switching condition, and other strategies are not needed to reduce the available power, so that the influence of heat on the service life of the power battery is fundamentally avoided, the service life of the battery is prolonged, and the running safety and stability are ensured.

Drawings

FIG. 1 is a flow chart of a method of battery power control in one embodiment;

FIG. 2 is a schematic flow chart of a process for calculating accumulated heat in one embodiment;

FIG. 3 is a schematic flow chart of determining the continuous current at the present moment in one embodiment;

FIG. 4 is a schematic flow diagram of another embodiment for calculating accumulated heat;

FIG. 5 is a diagram showing the correspondence between pulse voltages and time in one embodiment;

FIG. 6 is a flow chart of switching the second power in one embodiment;

FIG. 7 is a schematic diagram of another flow chart for switching the second power in one embodiment;

FIG. 8 is a block diagram of a battery power control device in one embodiment;

FIG. 9 is a block diagram of a server in one embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the disclosed embodiments and are not intended to limit the disclosed embodiments.

First, before the technical solution of the embodiments of the present disclosure is specifically described, a description is given of a technical background or a technical evolution context on which the embodiments of the present disclosure are based. In general, in the field of battery management of automobiles, the current technical background is: with the vigorous development of the new energy automobile industry, the Power battery technology has been greatly improved, and the SOP (State of Power, power State of battery) is used as a key algorithm of a BMS (Building Management System, power battery management system) to have great influence on the Power performance, economy and smoothness of the vehicle, so that the reasonable SOP algorithm can fully utilize the peak charge and discharge capacity of the Power battery and can not cause the Power battery to generate overheat, undervoltage, overvoltage and the like to be output beyond the allowable range of the performance of the Power battery. In order to utilize the charge and discharge capability of the battery, the battery pack is usually subjected to pulse charge and discharge tests for 5s, 10s, 30s and other time periods, and the maximum discharge and charge power which can be born by the power battery is measured as the peak discharge and charge power of the battery by taking the condition that the pulse charge and discharge ends are not subjected to overvoltage and undervoltage as criteria; under the condition of continuous discharging and charging, the maximum discharging and charging continuous current which can normally dissipate heat without overheating of a battery cooling system is taken as the maximum continuous current of the power battery, and the corresponding power is taken as the maximum continuous power. The above tests can be carried out under different temperature environments and under the state of charge (SOC) of the battery, and pulse power which can last for more than a certain time (e.g. 60 s) is sometimes used as continuous power.

To fully utilize the battery capacity, power cells are often allowed to output no more than peak power when the vehicle is being discharged and charged at high power, but under-voltage or over-heat may occur when the peak power output continues for a certain period of time (e.g., 5s or 10s, 30 s), requiring a smooth transition from available power to continuous power. When the real vehicle runs, according to the running working condition, the current tends to fluctuate severely, constant current discharge or charge is not always carried out according to peak value or continuous power, and a charging process is often mixed in the middle of a long-time discharge, so that the peak value power or continuous power cannot be used as the available power of the battery simply. On the one hand, in order to solve the problem that when the actual running power of the real vehicle does not reach the peak power, the sustainable charge and discharge time of the battery exceeds the sustainable time of the peak power (for example, the peak power can last for 5s and can last for 6s when the peak power is lower than 10 percent of the peak power), the actual power is still constrained according to the sustainable time of the peak, and the battery performance cannot be fully utilized; on the other hand, in order to make the current or power which fluctuates sharply equivalent to the peak current or power obtained by the constant current test and realize smooth switching with continuous charge and discharge, various SOP calculation methods or switching methods have been developed.

In the prior art, when determining the available power of a battery and calculating the SOP, some smoothing algorithms are generally adopted to switch the peak power which can be output by the power battery to continuous power when the vehicle exceeds the limit of the allowable use of the peak power (such limit is usually the time length of the charge and discharge of the peak power), and the following smoothing algorithms are adopted: (1) and when the charge and discharge exceeds a certain proportion (such as 90%) of the peak power, starting counting, when the charge and discharge is lower than a certain multiple of the peak power, starting counting, and when the count value exceeds a certain value, switching the maximum power allowed to be output from the peak power to the continuous power by adopting an interpolation method. (2) The peak power output capacity of the battery is regarded as a water tank, discharging, namely discharging water from the water tank, charging, namely filling water into the water tank, and outputting peak power when the water tank is full, wherein the water tank can only output continuous power when empty, the volume unit of the water tank is kWh, and the calculation method of discharging water and filling water is realized by adopting an integral value of power and time. (3) In the same environment, the water injection calculation method is realized by integrating the current and the time. (4) The integral of the peak power minus the continuous power and the integral of the peak current minus the continuous current and the integral of the time are used as the water filling algorithm of the pool algorithm, etc.

Based on the background, the applicant finds that the prior art measures the current charge and discharge load through a smoothing algorithm through long-term research on a vehicle battery and collection, demonstration and verification of experimental data, and aims to fully utilize the continuous or peak power charge and discharge of the battery, and the current or power which is changed severely is equivalent to constant current charge and discharge in the running charge and discharge process of the vehicle, so that the effect of measuring the charge and discharge load and comparing the constant current performance limit value of the power battery is achieved. These measures play a role in avoiding the overpower output of the battery at normal temperature. But near the temperature use boundary (e.g., 58 c, and 60 c), the prior art uses: in the methods of integrating power with respect to time, integrating current with respect to time, integrating time after subtracting continuous power from peak power, or integrating time after subtracting continuous current from peak current, because there is no quantitative relation with the temperature rise of the battery, the phenomenon that the battery is overheated after the battery is actually charged and discharged according to the available power is possibly caused by the fact that the battery is allowed to charge and discharge according to the algorithm, for example, under the working condition of alternating pulse charging and discharging, the current with respect to time of the battery is possibly obtained by the existing algorithm, the charging and discharging capacity of the pulse power is always the full state peak charging and discharging capacity, the battery is overheated due to the thermal effect of the actual pulse charging and discharging, and the available power of the battery has to be reduced by another protection strategy to prevent continuous temperature rise, so that the service life of the battery is reduced, meanwhile, over-temperature alarm can be generated, and running safety and stability are affected. Therefore, how to avoid influencing the service life of the battery and ensuring the driving safety becomes a problem to be solved in the related technology of the current power battery. In addition, it should be noted that, from the determination of the influence of the unbound heat in the prior art on the battery, the excessive heat affects the service life and the driving safety of the battery, and the technical solutions described in the following embodiments, the applicant has made a great deal of creative work.

The following describes a technical scheme related to an embodiment of the present disclosure in conjunction with a scenario in which the embodiment of the present disclosure is applied.

In one embodiment, as shown in fig. 1, a battery power control method is provided, and the embodiment of the disclosure is applied to a BMS power battery management system in a vehicle for illustration, where the BMS power battery system is used for intelligently managing and maintaining each battery unit, preventing the battery from being overcharged and overdischarged, prolonging the service life of the battery, and monitoring the state of the battery. The BMS battery management system comprises a battery management system, a control module, a display module, a wireless communication module, electrical equipment, a battery pack for supplying power to the electrical equipment and an acquisition module for acquiring battery information of the battery pack. It is understood that the BMS system may be implemented by an electronic device or a server. In an embodiment of the present disclosure, the method includes the steps of:

and step 101, calculating the accumulated heat of the power battery at the current moment according to the running current of the power battery at the current moment.

The power battery is a power source for providing power for tools, for example, a battery for providing power for various types of vehicles such as electric automobiles, electric trains, electric bicycles or golf carts. The power battery can generate heat in the charging or discharging process, and in general, the vehicle is provided with a cooling system for radiating the power battery, however, when the cooling system with larger heat generated by the power battery is insufficient in radiating, the heat in the power battery can be accumulated along with continuous use of the power battery, and when the temperature exceeds a temperature boundary, the overheat phenomenon can occur, so that the driving safety is influenced, and the service life of the battery is reduced. In order to ensure driving safety and reduce influence on the power battery and avoid the power battery from exceeding a temperature boundary, in the embodiment of the application, in the running process of the vehicle, the accumulated heat of the power battery at the current moment is calculated according to the running current of the power battery at the current moment, so that the available power of the power battery at the current moment is determined in real time according to the accumulated heat, and the power battery is charged or discharged by adopting proper available power under different conditions. And the running stability and the safety are ensured. The running current at the current moment refers to the current of the power battery charged or discharged at the current moment in the running process.

Step 102, determining whether the available power switching condition is satisfied according to the accumulated heat.

The BMS system may operate an SOP (state of power) algorithm for determining available power of the power battery at the current time, so that the BMS system controls the power battery to charge or discharge at the available power. Alternatively, the BMS system may acquire the current running current of the power battery in real time through a sensor or other devices. Specifically, the SOP algorithm may calculate an accumulated heat of the power battery at a current time according to an operation current of the power battery at the current time, determine whether an available power switching condition is satisfied according to the accumulated heat, and change a specific value of the available power if the available power switching condition is satisfied. Alternatively, the accumulated heat may refer to the sum of the heat accumulated by the power cells during a period from the start time of the vehicle starting operation to the current time. Or, since the cooling system can cool down and dissipate heat for the power battery, the accumulated heat can also refer to the sum of the accumulated heat of the power battery from the cooling of the heat to zero until the current moment, and the like.

The available power switching condition is used to determine whether a current available power of the power cell needs to be switched. Specifically, after the accumulated heat at the current moment is calculated, under the condition that the available power switching condition is met according to the accumulated heat, the available power at the current moment of the power battery is switched; in the case where it is determined from the accumulated heat that the available power switching condition is not satisfied, the power battery is kept charged or discharged with the available power at the present time.

Step 103, if the available power switching condition is satisfied, switching the available power of the power battery from a first power to a second power, wherein one of the first power and the second power is peak power, and the other is continuous power.

In particular, the available power of the power cell may be switched between peak power and sustained power. The peak power refers to the maximum discharging and charging power which can be born by the power battery at the current moment. The continuous power is the power that the power battery can normally dissipate heat and does not overheat. Of course, the peak power and the sustained power of the power battery are different at different temperatures and battery states of charge, and thus the peak power and the sustained power of the power battery under different conditions can be predetermined in the test environment. In the running process of the vehicle, according to whether the power switching condition is met or not, determining the peak power or continuous power at the current moment from different power values obtained by testing in a testing environment according to the temperature at the current moment of the power battery and the state of charge of the battery in real time, and taking the peak power or continuous power as the available power of the power battery. Optionally, in a test environment, under different conditions, performing pulse charging and discharging tests on the power battery for a preset period of time, and measuring the maximum discharging and charging power which can be born by the power battery, namely the peak power of the power battery, by taking the condition that the pulse charging and discharging ends are not subjected to overvoltage or undervoltage as a criterion; under different conditions, the power battery is continuously discharged and charged, and the power which can normally dissipate heat without overheating of the cooling system of the power battery is taken as continuous power.

Alternatively, the available power switching conditions may include a first available power switching condition and a second available power switching condition, and in the case that it is determined that the first available power switching condition is satisfied according to the accumulated heat, the current accumulated heat of the power battery is considered to be high, and thus it is determined that the available power is switched from the peak power to the continuous power to gradually decrease the heat. Under the condition that the second available power switching condition is met according to the accumulated heat, the current accumulated heat of the power battery is considered to be lower, so that the available power is determined to be switched from continuous power to peak power, the performance of the power battery is ensured, and the driving power of the vehicle is improved.

According to the battery power control method provided by the embodiment of the disclosure, the accumulated heat of the power battery at the current moment can be calculated according to the running current of the power battery at the current moment, and whether the available power switching condition is met or not is determined according to the accumulated heat; and if the available power switching condition is met, switching the available power of the power battery from the first power to the second power, wherein one of the first power and the second power is peak power, and the other is continuous power. Because the embodiment of the disclosure can determine that the power battery takes peak power as available power according to the accumulated heat of the power battery in the running process of the vehicle, or takes continuous power as available power, the influence of the heat on the power battery is fully considered, the available power of the power battery is directly determined from the accumulated heat according to the available power switching condition, and other strategies are not needed to reduce the available power, so that the influence of heat on the service life of the power battery is fundamentally avoided, the service life of the battery is prolonged, and the running safety and stability are ensured.

In one embodiment, as shown in fig. 2, a schematic flow chart of calculating accumulated heat provided in an embodiment of the present application is shown. Calculating the accumulated heat of the power battery at the current moment according to the running current of the power battery at the current moment, comprising:

step 201, obtaining an operation current of the power battery at the current moment, an internal resistance of the power battery at the current moment and a continuous current of the power battery at the current moment.

Alternatively, the running current at the current moment can be directly acquired through a sensor and other devices.

The internal resistance at the current moment refers to the direct current internal resistance or the alternating current internal resistance of the power battery at the current moment, and the internal resistance values of the power battery under the conditions of different temperatures and battery charge states are different. Optionally, the internal resistance of the power battery at the current moment can be obtained through an internal resistance map table stored in the BMS in advance, wherein the internal resistance map table comprises the corresponding relations between different temperatures and different battery charge states of the power battery and the internal resistance value of the power battery. Therefore, the temperature at the current moment of the power battery and the battery charge state at the current moment can be obtained through devices such as a sensor, and the corresponding internal resistance is searched from the internal resistance map table to serve as the internal resistance at the current moment based on the temperature at the current moment of the power battery and the battery charge state at the current moment. The battery state of charge in the embodiment of the present application refers to an SOC (state of charge) value of the power battery, that is, a proportion of the current remaining capacity of the power battery to the full charge.

Optionally, in a test environment, pulse discharging or charging is performed on the power battery for a specified duration under different temperature and SOC conditions, and the ratio of the difference between the starting voltage and the ending voltage of the pulse to the current of the power battery under the conditions is used as the internal resistance of the power battery under the conditions, so that the internal resistance map table is obtained.

Because the power battery has larger capacity and larger area, and the temperatures of different areas of the power battery at the same moment can be different, when the internal resistance at the current moment is determined, the SOC of the power battery at the current moment can be obtained, the highest temperature and the lowest temperature of each area of the power battery at the current moment can be obtained, the first candidate internal resistance value is searched from the internal resistance map table according to the highest temperature and the SOC, the second candidate internal resistance value is searched from the internal resistance map table according to the lowest temperature and the SOC, and the minimum value between the first candidate internal resistance value and the second candidate internal resistance value is used as the internal resistance at the current moment.

Correspondingly, the continuous currents corresponding to the power battery under different temperatures and SOC conditions are different, and optionally, the continuous current at the current moment can be determined according to the SOC of the power battery at the current moment and the highest temperature and the lowest temperature in the temperatures of the power battery at the current moment.

Referring to fig. 3, a schematic flow chart for determining a continuous current at a present moment according to an embodiment of the present application is shown. Specifically, the method provided by the embodiment of the present disclosure further includes:

step 301, obtaining the battery charge state of the power battery at the current moment, and obtaining the lowest temperature and the highest temperature in the temperatures of all areas of the power battery at the current moment.

As mentioned above, the temperatures of different areas of the power battery at the same time may be different, so the minimum temperature and the maximum temperature in the temperatures of the areas of the power battery at the current time and the battery state of charge, i.e. SOC, at the current time of the power battery need to be obtained to further more accurately determine the continuous current at the current time of the power battery.

Step 302, a first candidate continuous current corresponding to the lowest temperature and the current state of charge of the battery is determined.

A second candidate continuous current corresponding to the maximum temperature and the current state of charge of the battery is determined, step 303.

Optionally, the BMS system may store a continuous current map table corresponding to the power battery, where the continuous current map table includes different temperatures of the power battery and corresponding relations between different battery states of charge and continuous currents. The SOP algorithm can obtain a first candidate continuous current from a continuous current map table according to the lowest temperature and the battery charge state at the current moment; accordingly, a second candidate continuous current can be obtained by inquiring from a continuous current map table according to the highest temperature and the battery charge state at the current moment, so as to determine the continuous current at the current moment from the first candidate continuous current and the second candidate continuous current. Alternatively, the persistent current map table may be acquired in the test environment in advance. For example, under different temperatures and SOC conditions, under a normal overall vehicle thermal management strategy, the continuous current corresponding to the power battery under each condition can be tested to generate the continuous current map table. The overall vehicle thermal management policy is used for determining an application scenario and an environment of a vehicle, and the overall vehicle thermal management policy may be, for example, 13L/min flow and a water cooling condition of 20 ℃, but may also be other policies.

Step 304, taking the minimum value of the first candidate continuous current and the second candidate continuous current as the continuous current at the current moment.

Alternatively, to ensure more reasonably accurate calculation of the accumulated heat, the minimum value of the first candidate continuous current and the second candidate continuous current may be used as the continuous current at the current time to calculate the accumulated heat at the current time of the power battery by using the continuous current at the current time.

Step 202, calculating the accumulated heat based on the current running current, the current internal resistance and the current continuous current.

Wherein, BMS system can include the controller, and optionally, can adopt this controller to gather the heat of this power battery every predetermine cycle duration, and the heat that each cycle gathered adds up and obtains this accumulated heat.

Referring to fig. 4, another flow chart for calculating accumulated heat according to an embodiment of the present application is shown. Calculating the accumulated heat based on the current time of operation current, the current time of internal resistance, and the current time of continuous current, comprising:

step 401, the square of the running current at the present moment is subtracted from the square of the continuous current at the present moment to obtain a first current difference value.

The running current at the current moment is denoted as I, and the continuous current at the current moment is denoted as I _C The first current difference isAlternatively, embodiments of the present applicationThe square of the running current at the present time and the square of the continuous current at the present time are not limited, and may be any value of other powers, for example, 1.9 to 2.1 powers.

Step 402, multiplying the first current difference by the internal resistance at the current time and a preset period duration to obtain a first accumulated heat.

The internal resistance at the current time is recorded as R _t，soc The preset period length is recorded as deltat, and the first accumulated heat is

Step 403, adding the first accumulated heat and the second accumulated heat to obtain the accumulated heat; the second accumulated heat is the sum of the accumulated heat of the power battery in a period from the initial time to the preset period.

Wherein, as mentioned above, the heat collected in each period can be accumulated to obtain the accumulated heat. The first accumulated heat is heat acquired in a preset period corresponding to the current moment of the controller, and the heat needs to be accumulated with heat acquired in each previous period to obtain accumulated heat. Therefore, the sum of the heat accumulated by the controller in the period from the initial time to the time before the preset period of the power battery is recorded as second accumulated heat, and the accumulated heat of the current time of the power battery can be obtained by adding the first accumulated heat and the second accumulated heat. It can be seen that the accumulated heat is the sum of the heat accumulated by the power battery from the initial time to the current time. This accumulated heat is the heat accumulated inside the battery that the cooling system cannot dissipate.

Meanwhile, if the duration of the preset period is shorter, the method for calculating the accumulated heat can be equivalently deformed into a method for calculating the accumulated heat by adopting an integral mode. Thus, alternatively, the accumulated heat may be calculated by means of integration. Specifically, the accumulated heat Q may be calculated using the following formula:

in the above formula, Q is the accumulated heat at the current moment, t is the time of moment, t ₀ Is the initial charge and discharge time of the power battery, I is the current running current at the current moment, I _C For the continuous current at the present moment, R _t,soc Is the internal resistance at the current time.

In the embodiment of the application, considering the relation between the continuous current and the running current, when the running current is smaller than the continuous current, the cooling system can fully radiate heat for the power battery; when the running current is larger than the continuous current, the heat of the power battery is accumulated, so that the running current and the continuous current at the current moment of the power battery are obtained, the accumulated heat of the power battery is accurately calculated based on the square difference value of the running current and the continuous current and combined with the internal resistance and the preset period of the heat collected by the controller, a basis is provided for the follow-up determination of whether the available power switching condition is met, the accuracy of the available power switching of the power battery is improved, and the running stability is ensured.

After the accumulated heat is calculated, it may be further determined whether power switching is required based on the available power switching condition, and two cases of determining whether the available power switching condition is satisfied based on the accumulated heat will be described below.

In one embodiment, the first power may be a peak power, and determining whether the available power switching condition is satisfied according to the accumulated heat includes: detecting whether the accumulated heat is greater than or equal to a first heat threshold, the first heat threshold being determined based on a maximum allowable accumulated heat of the power cell, if the first power is peak power; in the event that the accumulated heat is detected to be greater than or equal to the first heat threshold, it is determined that the available power switching condition is satisfied.

Optionally, at the beginning of the running of the vehicle, the corresponding peak power can be determined as the available power of the power battery during the initial running according to the temperature of the power battery and the state of charge of the battery, and the running current of the power battery is larger and the heat of the power battery can be accumulated continuously during the process of charging and discharging with the peak power. And calculating the accumulated heat of the power battery in real time, wherein the first heat threshold is determined according to the maximum allowable accumulated heat of the power battery at the current moment, so that under the condition that the detected accumulated heat is larger than or equal to the first heat threshold, the accumulated heat at the current moment is determined to be higher, the heat of the power battery is reduced, the overheat of the battery is avoided, at the moment, the available power switching condition is determined to be met, and the continuous power of the power battery at the current moment is acquired, so that the available power at the current moment is switched from the peak power to the continuous power.

Alternatively, the maximum allowable accumulated heat of the power battery at the current time is recorded as Q _max The first heat threshold may be determined according to a predetermined relationship, for example, the first heat threshold may be a% Q _max A is the heat coefficient and represents multiplication. Alternatively, a may have a value between 0 and 100, which is not particularly limited herein.

Specifically, in the case that the first power is the peak power and the available power switching condition is satisfied, the available power is controlled to linearly decrease to the continuous power at the current moment, so that the accumulated heat of the power battery gradually decreases to less than a% Q _max Thereby recovering the peak charge and discharge capacity of the power battery, wherein the value of a and the reduction rate of the available power can be properly calibrated according to the control precision so that the heat quantity in the charge and discharge process does not exceed Q _max Therefore, the purpose of equivalently measuring the load of the battery in the charging and discharging process by using the heat generation and the heat dissipation of the battery is achieved.

In this embodiment of the present application, if the first power is the peak power, it is determined whether the available power switching condition is satisfied according to a relationship between the first heat threshold and the accumulated heat. The first heat threshold is determined according to the maximum allowable accumulated heat of the power battery at the current moment, so that the residual heat of the power battery for safe use can be obtained, the available power is switched to the continuous power in time, the power battery can be prevented from exceeding the temperature boundary for use, the non-constant current charging and discharging process in the running process of the real vehicle can be quantitatively measured and compared with the constant current charging and discharging process in the test calibration test, the quantitative control is carried out, the driving safety is ensured, and the influence of the overheat of the battery on the service life of the battery is avoided. Meanwhile, the peak power is linearly switched to the continuous power, so that the stability of driving can be ensured.

In one embodiment, in determining the maximum allowable accumulated heat, the method further comprises: and determining the maximum allowable accumulated heat according to the battery temperature at the current moment of the power battery and the battery charge state at the current moment.

The maximum allowable accumulated heat of the power battery is different under different temperature and SOC conditions, and the maximum allowable accumulated heat refers to the maximum allowable accumulated heat of the power battery at the current moment.

Alternatively, the maximum allowable accumulated heat may be calculated in real time according to the temperature and the remaining capacity of the power battery, or an allowable accumulated heat meter of the power battery may be stored in the BMS system in advance, and the maximum allowable accumulated heat of the power battery at the current time may be determined by querying the allowable accumulated heat meter. The manner in which the allowable accumulated heat meter is queried will be described.

In one embodiment, determining the maximum allowable accumulated heat based on the battery temperature at the current time and the battery state of charge at the current time of the power battery includes: and inquiring an allowable accumulated heat meter according to the battery temperature at the current moment of the power battery and the battery state of charge at the current moment, and determining the maximum allowable accumulated heat according to the inquiring result.

The allowable accumulated heat meter comprises the corresponding relation between different temperatures and different battery charge states of the power battery and allowable accumulated heat of the power battery, wherein the allowable accumulated heat is obtained according to the difference between the peak heat of the power battery and the continuous heat of the power battery, and the peak heat is obtained according to the peak current and the internal resistance of the power battery; the continuous heat is obtained according to the continuous current and the internal resistance of the power battery, and the continuous current is the current which can normally dissipate heat of the power battery and does not overheat.

In particular, the allowable accumulated heat meter may refer to a map of the available heat of the power battery, which represents the charge and discharge capability of the power battery beyond the continuous heat dissipation capability in a short time.

Alternatively, the battery state of charge at the current time of the power battery may be obtained, and the lowest temperature and the highest temperature in the temperatures of the respective regions at the current time of the power battery may be obtained. Determining a first candidate allowable accumulated heat corresponding to the lowest temperature and the current state of charge of the battery; determining a second candidate allowable accumulated heat corresponding to the maximum temperature and the current state of charge of the battery; and taking the minimum value of the first candidate allowable accumulated heat and the second candidate allowable accumulated heat as the maximum allowable accumulated heat at the current moment.

Each allowable accumulated heat value in the allowable accumulated heat meter is obtained according to the difference between the peak heat of the power battery and the continuous heat of the power battery, so that, optionally, a peak heat map table and a continuous heat map table of the power battery can be obtained in advance, wherein the peak heat map table comprises the corresponding relations between different temperatures of the power battery and different battery charge states and the peak heat of the power battery; the continuous heat map table comprises the correspondence between different temperatures and different battery states of charge of the power battery and the continuous heat of the power battery. And (3) taking the difference between the peak heat and the continuous heat under the same temperature and SOC condition to obtain the available heat of the power battery under each temperature and SOC condition, and obtaining the available heat map table.

Specifically, the peak heat at different temperatures and SOCs is obtained according to the peak current and internal resistance of the power battery, and the continuous heat at different temperatures and SOCs is obtained according to the continuous current and internal resistance of the power battery. Therefore, the peak current map table, the continuous current map table and the internal resistance map table of the power battery can be obtained in advance, the peak heat is obtained according to the peak current and the internal resistance corresponding to the same temperature and the SOC, and the continuous heat is obtained according to the continuous current and the internal resistance corresponding to the same temperature and the SOC.

After peak current map and continuous current map are obtained in a test environment, peak heat and continuous heat which can be born by the power battery can be calculated according to the following formula:

in the above, R _t，soc Refers to the internal resistance at temperature t and SOC; t is the pulse duration of pulse charge and discharge of the power battery; at Q _t，soc I is the peak heat at temperature t and SOC _t，soc Refer to peak current at temperature t and SOC; at Q _t，soc I is the continuous heat at temperature t and SOC _t，soc Refers to the continuous current at temperature t and SOC. As shown in fig. 5, which shows a schematic diagram of a correspondence between pulse voltage and time provided in the embodiment of the present application, a power battery charges and discharges a pulse with a start voltage V1, a stop voltage V2, and a pulse duration T, and based on this, the internal resistance calculation mode is as follows:

wherein I is the peak current at the power battery temperature t and SOC.

Therefore, it can be seen that in the test environment, the peak heat map table and the continuous heat map table can be calculated by acquiring the continuous current map table, the peak current map table and the internal resistance map table of the power battery, and further the available heat map table is obtained as the allowable accumulated heat table to be stored in the BMS system for determining the maximum allowable accumulated heat at the current moment in the driving process.

Optionally, the process of obtaining the persistent current map table, the peak current map table and the internal resistance map table in the test environment may be:

the peak current and the continuous current of the power battery at each temperature node (for example, one temperature node is taken at 10 ℃ per interval of-30 ℃ to 60 ℃) and each SOC node (for example, one node is taken at 10% per interval of 0% -100%) are measured. The testing method comprises the following steps: discharging the battery pack fully charged to 100% to a specified SOC (such as 50%) with a current of 1/3*C, then standing to a specified temperature (such as 20 ℃) until the temperatures of various parts in the battery pack are uniform (such as within a range of +/-2 ℃) for pulse discharging or charging for a specified duration (such as 10 seconds), and recording the current reaching one of the cut-off voltage or the cut-off temperature when the battery pack is just discharged to the specified duration as the peak current at the node (such as the temperature of 20 ℃ and the SOC of 50%); and the direct current internal resistance at the node is obtained by the ratio of the voltage difference and the current at the beginning and the end of the pulse. And obtaining peak currents and direct-current internal resistances at all nodes through repeated tests, and forming a peak current map table and an internal resistance map table. C is the capacity of the power battery.

And under different temperature and SOC conditions, under a normal whole vehicle thermal management strategy (such as a water cooling condition with 13L/min flow of 20 ℃), the continuous current of the power battery under each node is tested, and a continuous current map table is obtained.

In the embodiment of the application, the allowable accumulated heat meter can be queried according to the battery temperature at the current moment of the power battery and the battery state of charge at the current moment, and the maximum allowable accumulated heat is determined according to the query result. Because the allowable accumulated heat meter is determined in advance according to the application test of the power battery, the maximum allowable accumulated heat at the current moment can be inquired and obtained, so that whether the accumulated heat at the current moment of the power battery meets the available power switching condition or not can be accurately determined in real time, the available power of the power battery can be switched in time, and the driving safety is ensured.

In one embodiment, in another case, the first power is continuous power, and determining whether the available power switching condition is satisfied according to the accumulated heat includes: detecting whether the accumulated heat is less than or equal to a second heat threshold value, which is less than the first heat threshold value, under the condition that the first power is continuous power; and determining that the available power switching condition is satisfied in the case that the accumulated heat is detected to be less than or equal to the second heat threshold.

In the process of charging and discharging with continuous power, the running current of the power battery is smaller, the heat of the power battery can be continuously reduced, and the cooling system can help the power battery to dissipate heat, so that the accumulated heat of the power battery is reduced to even 0 along with the continuous dissipation of the heat. Therefore, the accumulated heat of the power battery is calculated in real time, and under the condition that the detected accumulated heat is smaller than or equal to the second heat threshold, the accumulated heat at the current moment is determined to be lower, so that the available power of the power battery can be properly improved, the performance of the power battery is ensured, the driving power of the vehicle is improved, at the moment, the available power switching condition is determined to be met, the peak power of the power battery at the current moment is obtained, and the available power at the current moment is switched from continuous power to peak power. Alternatively, the second heat threshold may be 0, and when the accumulated heat is detected as 0 or a negative value, it may be determined that the available power switching condition is satisfied. Alternatively, the available power can be controlled to be linearly increased to the peak power, and the driving stability is ensured.

Likewise, there are two cases of switching the available power of the power battery from the first power to the second power, namely, switching from the peak power to the continuous power and switching from the continuous power to the peak power, and the switching of the available power from the first power to the second power will be described below.

In one embodiment, the first power is a peak power in one case. Fig. 6 is a schematic flow chart of switching the second power according to an embodiment of the present application. In the case that the first power is the peak power, the switching the available power of the power battery from the first power to the second power includes:

and 601, acquiring the battery charge state at the current moment of the power battery, and acquiring the lowest temperature and the highest temperature in the temperatures of all areas at the current moment of the power battery.

Under the condition that the first power is the peak power, the corresponding second power is the continuous power, and the available power of the power battery is switched from the first power to the second power, namely, from the peak power to the continuous power.

Specifically, as described above, the temperatures of different areas of the power battery at the same time may be different, and therefore, the minimum temperature and the maximum temperature in the temperatures of the areas of the power battery at the current time and the battery charge state at the current time of the power battery need to be obtained, so as to further more accurately determine the continuous current at the current time of the power battery.

At step 602, a first candidate continuous power corresponding to the lowest temperature and the current state of charge of the battery is determined.

Step 603, determining a second candidate continuous power corresponding to the highest temperature and the current battery state of charge.

Optionally, the BMS system may store a continuous power map table corresponding to the power battery, where the continuous power map table includes different temperatures of the power battery and corresponding relations between different battery states of charge and continuous power. The SOP algorithm can obtain a first candidate continuous power from a continuous power map table according to the lowest temperature and the battery charge state at the current moment; accordingly, the second candidate continuous power can be obtained by inquiring from the continuous power map table according to the highest temperature and the battery charge state at the current moment, so as to determine the continuous power at the current moment from the first candidate continuous power and the second candidate continuous power.

Alternatively, the persistent power map table may be acquired in the test environment in advance. For example, similar to the continuous current map acquisition method, under different temperature and SOC conditions, under a normal overall vehicle thermal management strategy, continuous power corresponding to the power battery under each condition can be tested to generate the continuous power map table.

Step 604, taking the minimum value of the first candidate continuous power and the second candidate continuous power as the second power.

Optionally, to ensure more reasonable and accurate determination of the switched available power, the minimum value of the first candidate continuous current and the second candidate continuous current may be used as the continuous power at the current moment, so as to use the continuous power at the current moment as the available power, avoid overheat of the power battery, and ensure driving safety.

In one embodiment, in another case, the first power is continuous power. Fig. 7 is a schematic flow chart of another embodiment of the present application for switching the second power. In the case that the first power is continuous power, the switching the available power of the power battery from the first power to the second power includes:

step 701, obtaining the battery charge state of the power battery at the current moment, and obtaining the lowest temperature and the highest temperature in the temperatures of all areas of the power battery at the current moment.

Under the condition that the first power is continuous power, the corresponding second power is peak power, and the available power of the power battery is switched from the first power to the second power, namely, from the continuous power to the peak power, at the moment, the peak power of the current moment of the power battery needs to be obtained.

Step 702, a first candidate peak power corresponding to the lowest temperature and the current state of charge of the battery is determined.

Step 703 determines a second candidate peak power corresponding to the highest temperature and the current state of charge of the battery.

Alternatively, the BMS system may store a peak power map table corresponding to the power battery, where the peak power map table includes different temperatures of the power battery and a correspondence between different battery states of charge and peak power. The SOP algorithm can query and obtain a first candidate peak power from a peak power map table according to the lowest temperature and the battery charge state at the current moment; accordingly, the second candidate peak power can be obtained by searching from the peak power map table according to the highest temperature and the battery charge state at the current moment, so as to determine the peak power at the current moment from the first candidate peak power and the second candidate peak power.

Alternatively, the persistent power map table may be acquired in the test environment in advance. For example, in a similar manner to the acquisition of the peak current map, a battery pack fully charged to 100% is discharged to a specified SOC (e.g., 50%) at a current of 1/3*C, then pulse discharge or charge is performed for a specified period of time (e.g., 10 s) while standing to a specified temperature (e.g., 20 ℃) until the temperatures of the respective portions within the battery pack are uniform (e.g., within ±2deg.C), and the power reaching one of the cut-off voltage or cut-off temperature when just discharged for the specified period of time is recorded as the peak power at the node (e.g., 20 ℃, SOC 50%). And obtaining peak power at all nodes through repeated tests to obtain a peak power map table.

Step 704, taking the minimum value of the first candidate peak power and the second candidate peak power as the second power.

The minimum value of the first candidate peak power and the second candidate peak power is used as the second power to control the available power of the power battery to gradually and linearly increase from the continuous power to the determined peak power.

In the process that the vehicle runs with the available power as the peak power or the continuous power, the peak power or the continuous power can be updated in real time according to the temperature and the SOC of the power battery.

One embodiment of the present disclosure is described below in connection with a particular vehicle operating process power switching process, including in particular: when the actual vehicle is in operation, the BMS system acquires the highest temperature Tmax and the lowest temperature Tmin in the current battery pack, and checks the peak power map table according to the current SOC of the battery pack to obtain a first candidate peak power P _Tmax And a second candidate peak power P _Tmin Then at peak power P _max ＝min{P _Tmax ，P _Tmin -as available power of the current state battery pack; finding the available heat quantity Q of the first candidate _Tmax And a second candidate available heat quantity Q _Tmin Then with available heat Q _max ＝min{Q _Tmax ，Q _Tmin The energy is allowed as the battery pack in the current state, and the available energy Q is updated in real time according to the change of the temperature and the SOC _max . And simultaneously checking the persistent current map to obtain the persistent current Ic. In the driving process, when the vehicle is in use, the power battery pack starts to discharge or charge, the BMS system controls the available power P of the power battery pack to not exceed the allowable power Pav (Pav is the allowable power, and the initial value is set to be the peak power P _max ) And calculates the accumulated heat quantity Q of the power battery pack according to the following calculation formula:t is the time at the current moment, I is the running current of the power battery, I _C For the continuous current of the power battery at the present moment,R _t，soc the internal resistance of the power battery is the direct current internal resistance at the current moment.

Wherein the initial value of the accumulated heat Q is 0, and the lower limit t ₀ Also 0, when the calculated accumulated heat Q is 0 or a negative value, the accumulated heat q=0 is emphasized. When the accumulated heat quantity Q is greater than zero and is accumulated to be more than or equal to a percent of Q _max Control the allowable power Pav to linearly decrease to the current temperature of the power battery and the continuous power Pc at the SOC, whereby the accumulated heat Q gradually decreases to less than a% Q _max Thereby restoring the peak charge-discharge capability.

The heat coefficient a and the allowable power Pav drop rate are calibrated appropriately according to the control precision so that the accumulated heat Q in the charge and discharge process does not exceed Q _max Therefore, the purpose of equivalently measuring the load of the battery in the charging and discharging process by using the heat generation and the heat dissipation of the battery is achieved. Thus, the purpose of controlling power by adopting a heat accumulation method is achieved.

According to the embodiment of the disclosure, the heat of the power battery can be accumulated and recovered in real time, when the running current I does not exceed the continuous current Ic, the accumulated heat Q is 0, the power battery can output or receive feedback according to the peak power, when I is greater than Ic, the accumulated heat reaches a% Qmax, the power battery can not output or receive feedback according to the peak power any more, the BMS system control allows the power Pav to be linearly reduced, and meanwhile, I is reduced, but when I is still greater than Ic, Q still exceeds a% Qmax, when I is reduced to be less than Ic, qmax begins to be reduced until the capacity of discharging or receiving feedback is recovered when the I is 0. The linear reduction rate of the a value and the Pav can be properly calibrated, so that the running stability and the comfort are ensured.

The embodiment of the disclosure considers the adoption of an algorithm of equivalent heat accumulation to simulate the accumulation of battery heat in charging or discharging pulse, and simultaneously considers the heat fading (heat dissipation) factor to perform the equivalence of the real vehicle running working condition and the constant current test working condition. The method is used for simulating the generation and dissipation of heat in the battery pack by a simple and easy method, characterizing the accumulation of heat in the battery pack and calibrating the heat through a test, so that the residual heat for safely using the battery pack can be obtained, the battery can be prevented from exceeding a temperature boundary, the non-constant current charge and discharge process during the running of the real vehicle can be quantitatively measured and compared with the constant current charge and discharge process in the test calibration test, the quantitative control can be performed, the influence on the service life of the battery is effectively reduced, and the running safety is ensured.

It should be understood that, although the steps in the flowcharts above are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least a portion of the steps in the flowcharts above may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the execution of the steps or stages is not necessarily sequential, but may be performed in turn or alternately with at least a portion of the steps or stages in other steps or other steps.

In one embodiment, as shown in fig. 8, there is provided a battery power control apparatus 800 including: a heat calculation module 801, a first determination module 802, and a switching module 803, wherein:

a heat calculating module 801, configured to calculate an accumulated heat of the power battery at a current moment according to an operation current of the power battery at the current moment;

A first determining module 802 for determining whether an available power switching condition is satisfied according to the accumulated heat;

and a switching module 803, configured to switch the available power of the power battery from a first power to a second power if the available power switching condition is satisfied, where one of the first power and the second power is peak power and the other is continuous power.

In one embodiment, the first determining module 802 is specifically configured to:

In one embodiment, the apparatus further comprises:

In one embodiment, the first determining module 802 is specifically configured to: detecting whether the accumulated heat is less than or equal to a second heat threshold value, which is less than the first heat threshold value, under the condition that the first power is continuous power; and determining that the available power switching condition is satisfied in the case that the accumulated heat is detected to be less than or equal to the second heat threshold.

In one embodiment, the heat calculation module 801 is specifically configured to: acquiring the running current of the power battery at the current moment, the internal resistance of the power battery at the current moment and the continuous current of the power battery at the current moment; the accumulated heat is calculated based on the current time of operation current, the current time of internal resistance, and the current time of continuous current.

In one embodiment, the heat calculation module 801 is specifically configured to: the square of the running current at the current moment and the square of the continuous current at the current moment are subjected to difference to obtain a first current difference value; multiplying the first current difference value by the internal resistance of the current moment and the preset period duration to obtain a first accumulated heat; adding the first accumulated heat and the second accumulated heat to obtain the accumulated heat; the second accumulated heat is the sum of the accumulated heat of the power battery in a period from the initial time to the preset period.

In one embodiment, the apparatus further comprises:

In one embodiment, in the case that the first power is the peak power, the switching module 803 is specifically configured to:

In one embodiment, in the case that the first power is continuous power, the switching module 803 is specifically configured to:

For specific limitations of the battery power control device, reference may be made to the above limitations of the battery power control method, and no further description is given here. The respective modules in the above-described battery power control apparatus may be implemented in whole or in part by software, hardware, and a combination thereof. The above modules may be embedded in hardware or may be independent of a processor in the electronic device, or may be stored in software in a memory in the electronic device, so that the processor may call and execute operations corresponding to the above modules.

Fig. 9 is a block diagram of a server 1400 shown in accordance with an exemplary embodiment. With reference to fig. 9, server 1400 includes a processing component 1420 that further includes one or more processors and memory resources, represented by memory 1422, for storing instructions or computer programs, such as application programs, executable by the processing component 1420. The application programs stored in memory 1422 can include one or more modules, each corresponding to a set of instructions. Further, the processing component 1420 is configured to execute instructions to perform the method of battery power control described above.

The server 1400 may also include a power component 1424 configured to perform power management of the device 1400, a wired or wireless network interface 1426 configured to connect the device 1400 to a network, and an input/output (I/O) interface 1428. The server 1400 may operate an operating system based on storage 1422, such as Window14 14erverTM,Mac O14 XTM,UnixTM,LinuxTM,FreeB14DTM or the like.

In an exemplary embodiment, a storage medium is also provided that includes instructions, such as memory 1422 including instructions, that can be executed by a processor of server 1400 to perform the above-described methods. The storage medium may be a non-transitory computer readable storage medium, which may be, for example, ROM, random Access Memory (RAM), CD-ROM, magnetic tape, floppy disk, optical data storage device, etc.

In an exemplary embodiment, a computer program product is also provided, which, when being executed by a processor, may implement the above-mentioned method. The computer program product includes one or more computer instructions. When loaded and executed on a computer, these computer instructions may implement some or all of the methods described above, in whole or in part, in accordance with the processes or functions described in embodiments of the present disclosure.

Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in embodiments provided by the present disclosure may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, or the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory. By way of illustration, and not limitation, RAM can be in the form of a variety of forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), and the like.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples merely represent a few implementations of the disclosed examples, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made to the disclosed embodiments without departing from the spirit of the disclosed embodiments. Accordingly, the protection scope of the disclosed embodiment patent should be subject to the appended claims.

Claims

1. A method of battery power control, the method comprising:

calculating accumulated heat of the power battery at the current moment according to the running current of the power battery at the current moment;

determining whether an available power switching condition is satisfied according to the accumulated heat;

and if the available power switching condition is met, switching the available power of the power battery from a first power to a second power, wherein one of the first power and the second power is peak power, and the other is continuous power.

2. The method of claim 1, wherein said determining whether an available power switching condition is met based on said accumulated heat comprises:

detecting whether the accumulated heat is greater than or equal to a first heat threshold value, the first heat threshold value being determined according to a maximum allowable accumulated heat of the power battery, in the case that the first power is peak power;

in the event that the accumulated heat is detected to be greater than or equal to the first heat threshold, it is determined that the available power switching condition is satisfied.

3. The method according to claim 2, wherein the method further comprises:

and determining the maximum allowable accumulated heat according to the battery temperature at the current moment of the power battery and the battery state of charge at the current moment.

4. A method according to claim 3, wherein said determining said maximum allowable accumulated heat based on a battery temperature at a current time of said power battery and a battery state of charge at the current time comprises:

inquiring an allowable accumulated heat meter according to the battery temperature at the current moment of the power battery and the battery state of charge at the current moment, and determining the maximum allowable accumulated heat according to an inquiry result;

The allowable accumulated heat meter comprises the corresponding relation between different temperatures and different battery charge states of the power battery and allowable accumulated heat of the power battery, wherein the allowable accumulated heat is obtained according to the difference between the peak heat of the power battery and the continuous heat of the power battery, and the peak heat is obtained according to the peak current and the internal resistance of the power battery; the continuous heat is obtained according to the continuous current and the internal resistance of the power battery, and the continuous current is the current which normally dissipates heat and does not overheat of the power battery.

5. The method of claim 2, wherein said determining whether an available power switching condition is met based on said accumulated heat comprises:

detecting whether the accumulated heat is less than or equal to a second heat threshold value, which is less than the first heat threshold value, under the condition that the first power is continuous power;

and determining that the available power switching condition is met if the accumulated heat is detected to be less than or equal to the second heat threshold.

6. The method of claim 1, wherein calculating the accumulated heat of the power cell at the present time based on the current operating current of the power cell at the present time comprises:

Acquiring the running current of the power battery at the current moment, the internal resistance of the power battery at the current moment and the continuous current of the power battery at the current moment;

the accumulated heat is calculated based on the running current at the present time, the internal resistance at the present time, and the continuous current at the present time.

7. The method of claim 6, wherein the calculating the accumulated heat based on the current time of operation, the current time of internal resistance, and the current time of continuous current comprises:

the square of the running current at the current moment is differenced with the square of the continuous current at the current moment to obtain a first current difference value;

multiplying the first current difference value by the internal resistance at the current moment and a preset period duration to obtain a first accumulated heat;

adding the first accumulated heat and the second accumulated heat to obtain the accumulated heat; wherein the second accumulated heat is the sum of the heat accumulated by the power battery in a period from an initial time to before the preset period.

8. The method of claim 6, wherein the method further comprises:

Acquiring a battery charge state at the current moment of the power battery, and acquiring the lowest temperature and the highest temperature in the temperatures of all areas at the current moment of the power battery;

determining a first candidate continuous current corresponding to the lowest temperature and the current battery state of charge;

determining a second candidate continuous current corresponding to the highest temperature and the current state of charge of the battery;

and taking the minimum value of the first candidate continuous current and the second candidate continuous current as the continuous current at the current moment.

9. The method of claim 1, wherein, in the case where the first power is a peak power, the switching the available power of the power battery from the first power to the second power comprises:

determining a first candidate continuous power corresponding to the lowest temperature and the battery state of charge at the current moment;

determining a second candidate continuous power corresponding to the highest temperature and the battery state of charge at the current time;

And taking the minimum value of the first candidate continuous power and the second candidate continuous power as the second power.

10. The method of claim 1, wherein, in the case where the first power is continuous power, the switching the available power of the power battery from the first power to the second power comprises:

determining a first candidate peak power corresponding to the lowest temperature and the current battery state of charge;

determining a second candidate peak power corresponding to the highest temperature and the battery state of charge at the current time;

and taking the minimum value of the first candidate peak power and the second candidate peak power as the second power.

11. A battery power control device, the device comprising:

a first determining module for determining whether an available power switching condition is satisfied according to the accumulated heat;

12. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any one of claims 1 to 10 when the computer program is executed.

13. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 10.

14. A computer program product comprising a computer program, characterized in that the computer program, when executed by a processor, implements the steps of the method of any one of claims 1 to 10.