CN115079004A

CN115079004A - SOC correction method and device of storage battery, storage medium and terminal

Info

Publication number: CN115079004A
Application number: CN202110281361.8A
Authority: CN
Inventors: 徐婉朦; 真野亮; 市川真士
Original assignee: Toyota Motor Corp
Current assignee: Toyota Motor Corp
Priority date: 2021-03-16
Filing date: 2021-03-16
Publication date: 2022-09-20

Abstract

A SOC correction method and device, a storage medium and a terminal of a storage battery are provided, the SOC correction method of the storage battery comprises the following steps: monitoring the accumulated working time of the storage battery; when an external power supply is adopted to charge the storage battery, if the monitored accumulated working time of the storage battery meets the correction condition, correcting the SOC value of the storage battery; wherein the correction condition includes a correction period that is determined based on an SOC accumulated error rising speed of the battery and an error allowable deviation of the SOC. According to the scheme, the reasonability of determining the correction time of the SOC of the storage battery can be improved, and the normal use of the storage battery is ensured.

Description

SOC correction method and device of storage battery, storage medium and terminal

Technical Field

The embodiment of the invention relates to the field of storage batteries, in particular to a method and a device for correcting SOC of a storage battery, a storage medium and a terminal.

Background

For the automobile adopting the storage battery as power, the storage battery plays a key role in the endurance mileage of the automobile. In order to ensure the usability of the battery, the State of Charge (SOC) of the battery is generally controlled within a certain range so that the battery can operate in an optimum State when the battery is used.

The SOC of a battery refers to the proportion of the capacity that the battery can deliver to the total dischargeable capacity. Usually, an OCV-SOC table lookup method is used to obtain an SOC value according to an Open Circuit Voltage (OCV) in combination with a mapping relationship between the OCV and the SOC in the OCV-SOC table. However, for some types of batteries (e.g., lithium iron phosphate batteries), the voltages are almost the same in the SOC range corresponding to the optimum state of the battery, so that it is difficult to determine the SOC value from the voltages. The SOC value is usually estimated by current integration.

However, the SOC value estimated by the current integration method is likely to cause a sudden change in SOC when the battery is used, and further affects normal use of the battery.

Disclosure of Invention

The invention aims to provide a method for correcting the SOC of a storage battery.

In order to achieve the above object, an embodiment of the present invention provides a method for correcting SOC of a battery, including: monitoring the accumulated working time of the storage battery; when an external power supply is used for charging the storage battery, if the accumulated working time of the storage battery is monitored to meet a correction condition, correcting the SOC value of the storage battery; wherein the correction condition includes a correction period that is determined based on an SOC accumulated error rising speed of the battery and an error allowable deviation of the SOC.

Optionally, the error tolerance of the SOC includes a first deviation and/or a second deviation, where the first deviation is a maximum deviation that the allowed estimated SOC value is greater than the true SOC value, and the second deviation is a maximum deviation that the allowed estimated SOC value is less than the true SOC value.

Optionally, the correction period is determined as follows: estimating a first time length required when the deviation of the SOC estimation value greater than the SOC true value reaches the first deviation according to the rising speed of the SOC accumulated error; estimating a second time length required when the deviation of the SOC estimated value smaller than the SOC true value reaches the second deviation according to the rising speed of the SOC accumulated error; and determining the correction period according to the first time length and/or the second time length.

Optionally, if it is monitored that the accumulated operating time of the storage battery meets the correction condition, correcting the SOC value of the storage battery includes: when the accumulated working time of the storage battery is monitored to reach the correction period, the full charge SOC value of the storage battery is increased from a first threshold value to a second threshold value; generating an SOC correction request when a gun inserting signal is detected; detecting a charging voltage of the storage battery; when the charging voltage of the storage battery is detected to reach a first voltage threshold value, the SOC value corresponding to the first voltage threshold value is corrected to be the second threshold value in response to the SOC correction request.

Optionally, the SOC correction method for the storage battery further includes: and after the SOC value corresponding to the first voltage threshold value is corrected to the second threshold value, reducing the full charge SOC value from the second threshold value to the first threshold value.

Optionally, the SOC correction method for the storage battery further includes: after the SOC value corresponding to the first voltage threshold value is corrected to the second threshold value, the SOC correction request is terminated, and a discharging request is generated; in response to the discharging request, calling a designated component to discharge the storage battery until the SOC value of the storage battery is reduced to a third threshold value; and after the SOC value of the storage battery is reduced to a third threshold value, clearing the accumulated working time of the storage battery, and monitoring the accumulated working time of the storage battery again.

Optionally, the first deviation is determined as follows: calculating a difference value between a preset SOC lower limit value and an actual SOC lower limit value according to the preset SOC lower limit value and the actual SOC lower limit value, and determining the first deviation according to the difference value; determining said second deviation in the following manner: and determining the second deviation according to the SOC true value, the deceleration regulated by the regulation and the preset SOC upper limit value.

An embodiment of the present invention further provides a device for correcting SOC of a battery, including: the working duration monitoring unit is used for monitoring the accumulated working duration of the storage battery; the correction unit is used for correcting the SOC value of the storage battery if the accumulated working time of the storage battery is monitored to meet a correction condition when the storage battery is charged by an external power supply, wherein the correction condition comprises a correction period, and the correction period is determined based on the SOC accumulated error rising speed of the storage battery and the error tolerance of the SOC.

Embodiments of the present invention further provide a storage medium, which is a non-volatile storage medium or a non-transitory storage medium, and a computer program is stored on the storage medium, where the computer program is executed by a processor to perform the steps of any one of the above methods for correcting SOC of a storage battery.

The embodiment of the invention also provides a terminal, which comprises a memory and a processor, wherein the memory is stored with a computer program capable of running on the processor, and the processor executes the steps of any one of the storage battery SOC correction methods when running the computer program.

Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:

when the storage battery is charged by adopting an external power supply, if the accumulated working time of the storage battery is monitored to meet a correction condition, the SOC value of the storage battery is corrected, wherein the correction condition comprises a correction period, and the correction period is determined based on the SOC accumulated error rising speed and the error tolerance of the SOC of the storage battery, so that the timing of correcting the SOC value of the storage battery is related to the SOC accumulated error rising speed and the error tolerance of the SOC, the reasonability of determining the correction timing of the SOC of the storage battery can be improved, and the normal use of the storage battery is ensured.

Drawings

FIG. 1 is a flowchart of a method for correcting SOC of a battery according to an embodiment of the present invention;

fig. 2 is a timing chart of a method of correcting SOC of a storage battery in the embodiment of the invention;

fig. 3 is a schematic structural diagram of a SOC correction apparatus for a battery in an embodiment of the present invention.

Detailed Description

As described above, with some types of secondary batteries (such as lithium iron phosphate batteries), the voltages are almost the same in the SOC range corresponding to the optimum state of the secondary battery, so that it is difficult to determine the SOC value by the voltages. In the prior art, the SOC value is generally estimated by a current integration method. The current integration method generally uses a current sensor to sample the current value for SOC estimation, and the current sensor has a certain error, and the error is accumulated over time. In the use process of the storage battery, when the accumulated error reaches a certain degree, the SOC is easy to break, and the normal use of the storage battery is further influenced.

In order to solve the above-mentioned object, in an embodiment of the present invention, when the battery is charged by using an external power source, if it is monitored that the accumulated operating time period of the battery satisfies a correction condition, the SOC value of the battery is corrected, wherein the correction condition includes a correction cycle, and the correction cycle is determined based on the SOC accumulated error rising speed of the battery and the error allowable deviation of the SOC, so that the timing of correcting the SOC value of the battery is correlated with the SOC accumulated error rising speed and the error allowable deviation of the SOC, and therefore, the reasonableness of determining the correction timing of the SOC of the battery can be improved, and the normal use of the battery can be ensured.

In order to make the aforementioned objects, features and advantages of the embodiments of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings.

An embodiment of the present invention provides a method for correcting an SOC of a battery, and referring to fig. 1, a flowchart of the method for correcting the SOC of the battery in the embodiment of the present invention is provided, which may specifically include the following steps:

in step S11, the cumulative operating time of the battery is monitored.

In a vehicle that employs a battery as a power source, such as an electric vehicle or a hybrid vehicle, the cumulative operating time period of the battery can be monitored by monitoring the start or stop of the vehicle.

And step S12, when the storage battery is charged by an external power supply, if the accumulated working time of the storage battery is monitored to meet the correction condition, correcting the SOC value of the storage battery.

In particular implementations, the correction condition may include a correction period. The correction period may be determined based on the SOC accumulated error rising speed of the battery and the error tolerance of the SOC.

In the embodiment of the invention, the storage battery is charged by an external power supply, which can also be called AC/DC charging. The external power supply is adopted to charge the storage battery, and the charging gun on the charging pile is adopted to insert the gun for charging. When the external power supply is used to charge the battery, the SOC value of the battery can be corrected.

Research shows that the reason of the sudden change of the SOC when the storage battery is used is that the current sensor used for collecting the current value generates errors in the current value sampling process. In addition, errors may also occur during analog-to-digital (a/D) conversion of the current values collected by the current sensors. So that a deviation is estimated between the estimated SOC estimation value and the true SOC value based on the integration of the current value and time. Since the SOC estimation value is estimated based on the time integration, an error is accumulated over time, and a deviation between the estimated SOC estimation value and the actual SOC value increases as the usage time of the battery increases. As the deviation of the SOC value increases, a sudden change in SOC is liable to occur during use of the battery.

In particular implementations, the error tolerance of the SOC may include a first deviation and/or a second deviation. Wherein the first deviation is the maximum deviation of the allowed SOC estimation value greater than the SOC true value. The second deviation is the maximum deviation of the allowed estimated value of SOC being smaller than the true value of SOC.

That is, when the error tolerance of the SOC includes the first deviation, the correction period is determined based on the accumulated error rising speed of the SOC and the first deviation. When the error tolerance of the SOC includes a second deviation, a correction period is determined according to an accumulated error rising speed of the SOC and the second deviation. When the error tolerance of the SOC includes a first deviation and a second deviation, a correction period is determined according to an accumulated error rising speed of the SOC, the first deviation, and the second deviation.

In practice, in order to maintain the battery in a better state, a preset SOC lower limit value (also referred to as full SOC) of the battery is usually configured. When the estimated SOC value of the battery reaches the preset lower SOC limit, the discharge of the battery is limited, and the battery generally needs to be charged to avoid a shortage of the battery and improve the performance of the battery.

In a specific implementation, the first deviation may be determined by calculating a difference between a preset SOC lower limit value and an actual SOC lower limit value according to the preset SOC lower limit value and the actual SOC lower limit value, and obtaining a maximum deviation that an allowed SOC estimation value is greater than a true SOC value according to the calculated difference, that is, obtaining the first deviation.

In some non-limiting embodiments, the generally used SOC lower limit value may be set from the viewpoint of energy management, and the generally used SOC lower limit value may be set as the preset SOC lower limit value. The energy management may include one or more of energy management of the entire vehicle, energy management of the storage battery, and the like.

In some non-limiting embodiments, the actual lower SOC limit may be calculated based on the output of the battery required to meet the vehicle output power demand.

In an implementation, in order to ensure that the battery maintains a better operating state, a preset SOC upper limit (also referred to as a full SOC) of the battery may be configured. When the SOC estimated value reaches a preset SOC upper limit value when the storage battery is charged, the storage battery is judged to be fully charged, and the storage battery is stopped being charged.

When the preset SOC lower limit value and the preset SOC upper limit value of the battery are configured at the same time, the corresponding SOC value when the battery operates is usually between the preset SOC lower limit value and the preset SOC upper limit value, so that the battery is in the optimal operating state.

In particular implementations, the second deviation may be determined based on the actual value of SOC, the regulatory deceleration, and a preset upper SOC limit.

In order to meet the deceleration requirement of the regulatory requirement, in some embodiments, the corresponding deceleration is produced by regenerating energy by means of battery energy regeneration to meet the regulatory deceleration requirement.

In the embodiment of the present invention, in order to determine the second deviation, the SOC value required for energy regeneration is set. Therefore, the storage battery can be charged in a preset full charge state if the vehicle decelerates, and braking energy recovery is realized. That is, the storage battery still has the braking energy recovery capacity during deceleration under the preset full charge state so as to meet the deceleration requirement specified by the regulation. The phenomenon that the SOC reaches the upper limit of the SOC and the braking energy cannot be normally recovered in the braking energy recovery process specified by a regulation can be avoided through the configured second deviation.

In some embodiments, the second deviation may be calculated using the following equation (1). That is, the conditions defined by the following equations (1) and (2) are satisfied among the second deviation, the SOC true value, the SOC estimated value, the SOC value required for energy regeneration, and the preset SOC upper limit value.

ΔSOC＜SOC _r -SOC _e ； (1)

SOC _e ＝SOC _f +SOC _n ； (2)

Wherein Δ SOC is a second deviation; SOC (system on chip) _f Is a preset SOC upper limit value; SOC (system on chip) _n A SOC value required for energy regeneration; SOC _r The actual value of the SOC; SOC _e Is an estimate.

In a specific implementation, specific values of the first deviation or the second deviation may be configured according to a usage scenario of the vehicle. The driving route, road conditions, etc. may be different in different usage scenarios, so that the configured first deviation may be different, and the second deviation may also be different. That is, the specific values of the first deviation and the second deviation can be configured according to the actual use scene of the vehicle. The road condition may include a slope, a length of a slope, and the like of the road surface.

Since the deviation between the estimated SOC value and the true SOC value gradually increases as the usage time of the battery goes by. A first period of time required for the deviation of the SOC estimation value greater than the true value of SOC to reach the first deviation may be estimated based on the SOC accumulated error rising speed.

A second period of time required for the deviation of the estimated SOC value smaller than the true SOC value to reach the second deviation may be estimated based on the rising speed of the accumulated SOC error.

To address the above issues, in some non-limiting embodiments, the correction period may be determined based on the first duration and/or the second duration.

For example, when the error tolerance of the SOC includes a first deviation and a second deviation, a first time period and a second time period may be calculated, and at this time, a minimum value of the first time period and the second time period may be taken as the correction period. Since the deviation between the estimated value of SOC and the actual value of SOC continues to expand after the first period of time is exceeded, the first deviation permitted will be exceeded, and at this time, the battery may not be able to output the output power actually required by the vehicle. When the second period of time is exceeded, the deviation between the estimated SOC value and the actual SOC value continues to increase, and the second deviation that is allowed will be exceeded, possibly resulting in failure to efficiently recover the braking energy when the vehicle is decelerating. And taking the minimum value of the first time length and the second time length as the correction period, the phenomena that the storage battery can not output the output power actually required by the vehicle and the braking energy can not be effectively recovered when the vehicle decelerates can be avoided, and the normal use of the storage battery is ensured.

For another example, when the error tolerance of the SOC includes a first deviation, a first time period may be calculated, and the first time period is used as a correction period.

For another example, when the error tolerance of the SOC includes a second deviation, a second time period may be calculated as the correction period.

In a particular implementation, the SOC accumulated error rise rate may be preconfigured. When the SOC estimation value of the battery is estimated based on the current, a mapping relationship between the usage period of the battery and the SOC accumulated error increase rate may be configured in advance. The rate of increase of the accumulated SOC error may be an SOC error corresponding to a service life of the battery.

In some embodiments, the SOC accumulated error growth rate may increase linearly or non-linearly.

As can be seen from the above, when the storage battery is charged by using an external power supply, if it is monitored that the accumulated operating time period of the storage battery satisfies the correction condition, the SOC value of the storage battery is corrected, wherein the correction condition includes a correction cycle, and the correction cycle is determined based on the SOC accumulated error rising speed of the storage battery and the error tolerance of the SOC, so that the timing of correcting the SOC value of the storage battery is correlated with the SOC accumulated error rising speed and the error tolerance of the SOC, and thus the rationality of determining the correction timing of the SOC of the storage battery can be improved, and the normal use of the storage battery can be ensured.

In specific implementation, if the accumulated working time of the storage battery is monitored to reach the correction period, the full charge SOC value of the storage battery is increased from the first threshold value to the second threshold value. And continuously detecting whether a gun inserting signal is received. When a gun insertion signal is detected, an SOC correction request is generated. During the charging process of the storage battery, the charging voltage of the storage battery is detected, and when the charging voltage of the storage battery is detected to reach a first voltage threshold value, the SOC value corresponding to the first voltage threshold value is corrected to a second threshold value in response to an SOC correction request.

In some non-limiting embodiments, the range of values for the first threshold may include 60% to 80%. The second threshold value may range from 80% to 100%.

In some embodiments, the first threshold value is 70%.

In some embodiments, the second threshold value takes on a value of 100%.

In specific implementation, when the SOC value of the battery is corrected, after a charging gun is inserted into a charging interface, a corresponding gun insertion signal is generated, and after a Battery Management System (BMS) receives the gun insertion signal, the BMS sends a high voltage (BMS) request to a vehicle control system (HV ECU), and the BMS request is used for requesting the high voltage to complete a subsequent charging process. And meanwhile, the BMS judges whether the current accumulated working time of the storage battery reaches the correction condition. When the correction condition is met, generating an SOC correction request, and pulling up the full charge SOC value of the storage battery from a first threshold value to a second threshold value. Accordingly, if the accumulated operating time period of the battery does not satisfy the correction condition, the HV ECU allows the high voltage electric power even with the AC/DC charging, but does not generate the SOC correction request.

In some embodiments, after correcting the SOC value corresponding to the first voltage threshold to the second threshold, the full charge SOC value is decreased from the second threshold to the first threshold. And the SOC value of the vehicle running normally is configured to ensure the full charge SOC value which can be supported by the subsequent charging so as to maintain the working of the storage battery in the optimal SOC range. That is, after the full charge SOC value is raised to the second threshold, the full charge SOC value is continuously maintained at the second threshold until the SOC value corresponding to the first voltage threshold is corrected to the second threshold, and the full charge SOC value is not reduced from the second threshold to the first threshold.

The first voltage threshold is related to the type of the battery and the value of the second threshold. It can be understood that the first voltage threshold is different according to different types of the storage battery and different values of the second threshold, and specific values of the first voltage threshold are not limited herein.

In a specific implementation, after the SOC value corresponding to the first voltage threshold is corrected to the second threshold, the SOC correction request is terminated, and the discharge request is generated. In response to the discharging request, calling a specified component to discharge the storage battery until the SOC value of the storage battery is reduced to a third threshold value; and after the SOC value of the storage battery is reduced to a third threshold value, resetting the accumulated working time of the storage battery, and monitoring the accumulated working time of the storage battery again. That is, the accumulated operating time period of the battery is correlated with the correction condition of the SOC. And after the SOC value of the storage battery is reduced to a third threshold value, one-time SOC correction is completed. And resetting the accumulated working time of the storage battery and counting the accumulated working time of the storage battery again every time the SOC correction is finished.

In some embodiments, in response to the discharge request, in the process of calling the specification component to discharge the storage battery, before the SOC value of the storage battery is reduced to the third threshold value, the user actively ends the charging by pulling out the charging gun. And if the gun pulling operation is detected before the SOC value of the storage battery is reduced to the third threshold value, clearing the accumulated working time of the storage battery, and monitoring the accumulated working time of the storage battery again.

In some embodiments, when the designated component is called to discharge the storage battery in response to the discharge request, the designated component can be controlled to work at the set power.

In one embodiment of the present invention, the SOC value consumed by the specifying means is calculated based on the set power of the specifying means and the discharge current of the storage battery; calculating the remaining SOC value of the battery according to the SOC value consumed by the specifying component until the remaining SOC value of the battery is reduced to the third threshold value.

In another embodiment of the present invention, by detecting the voltage of the battery, when the voltage of the battery reaches the second voltage threshold, the SOC value corresponding to the second voltage threshold is taken as the third threshold.

In an embodiment of the present invention, the specifying means may include at least one of: temperature control device, water pump and air conditioner.

In a specific implementation, the storage battery is usually provided with a temperature control device, and the temperature control device can adjust the temperature of the storage battery. For example, the temperature control device may include a heating module and a cooling module. The heating module heats the storage battery when the temperature of the storage battery is lower than a first temperature threshold value. The cooling module cools the battery when the temperature of the battery is higher than a second temperature threshold.

In an embodiment of the present invention, in order to rapidly discharge the battery to rapidly decrease to the third threshold, the temperature control module may be controlled to repeatedly raise and cool the battery within the set temperature range.

In another embodiment of the present invention, the electric quantity of the storage battery can be rapidly consumed by a water pump or a fan, so as to increase the speed of reducing the electric quantity of the storage battery to the third threshold value. The water pump is used for supplying water circulation power for cooling water of the cooling module, and the fan is used for dissipating heat.

In specific implementation, the first threshold may be equal to the third threshold, and the first threshold may also not be equal to the third threshold, and may be configured specifically according to actual requirements.

In a specific implementation, after the SOC value of the storage battery is reduced to the third threshold, the SOC correction of the storage battery this time is completed, the discharge request and the gun insertion signal are terminated, the accumulated operating time of the storage battery is cleared, the accumulated operating time of the storage battery is monitored again, and the SOC correction of the storage battery at the next time is waited to be started.

In a specific implementation, in order to ensure driving safety, before the SOC value of the storage battery is reduced to the third threshold value in the process of discharging the storage battery by calling the specifying component, when a gun drawing operation by a user is detected, a discharge incompletion prompt is output. The method and the device can remind the user that the discharging operation of the current vehicle is not finished, so that the user can visually know the charging stage of the vehicle and remind the user to finish discharging the storage battery in other modes in time after pulling out the gun.

In some application scenarios with low time requirement on vehicle use requirement, in order to further improve vehicle use safety, in some embodiments, the charging gun may be locked before the SOC value of the storage battery is reduced to the third threshold value; and releasing the locking of the charging gun after the SOC value of the storage battery is reduced to a third threshold value. Wherein, under the rifle locking state that charges, the plug operation of restriction rifle that charges, also the user can't be pulled out the rifle that charges from the vehicle promptly. By forcibly discharging the fully charged storage battery, the recovery of braking energy during deceleration of the vehicle can be ensured, and the driving safety is improved.

Further, in order to improve driving safety and simultaneously take into account actual vehicle utilization requirements of a user and improve user experience, the charging gun can be locked when the SOC value of the storage battery is higher than the first threshold value or before the SOC value of the storage battery is reduced to the third threshold value. Before the SOC value of the storage battery is reduced to a third threshold value, when gun pulling operation of a user is detected, a warning that discharging is not completed is output, the charging gun is kept locked, and if the gun pulling operation of the user is detected again, the charging gun is unlocked. After the charging gun is unlocked, the user can pull out the charging gun.

In order to facilitate better understanding and implementation of the embodiments of the present invention for those skilled in the art, referring to fig. 2, a timing diagram of SOC correction of a battery in the embodiments of the present invention is given, and the SOC correction of the battery is described by a non-limiting example with reference to fig. 2.

And when the SOC of the storage battery is corrected last time, counting the accumulated working time of the storage battery from zero, and when the accumulated working time of the storage battery reaches the set time corresponding to the correction period, judging that the accumulated working time of the storage battery meets the correction condition, and starting to correct the SOC value of the storage battery. For example, the correction of the SOC value of the battery is started when the integrated operating time period of the battery is configured to reach 40 hours. It should be noted that the accumulated operating time of the storage battery in the illustrated example is 40 hours, which is only an illustrative description for easy understanding, and in practice, other values may be used, and are not limited herein.

And when the accumulated working time of the storage battery reaches the set time length corresponding to the correction period, pulling up the full charge SOC value from the first threshold value to a second threshold value. For example, the full SOC value is pulled up from 70% to 100%. It should be noted that other values may also exist in the first threshold and the second threshold, and the above examples do not limit the protection scope of the present invention.

In the SOC calibration process for the battery, if a gun plugging operation of the charging gun is detected, a gun plugging signal is corresponding to a second pulse of the gun plugging signal in fig. 2. The BMS sends a BMS request to the HV ECU requesting a high voltage on the HV ECU. The HV ECU may request a high voltage in response to the BMS. When the vehicle is under high pressure, the storage battery can be charged and discharged.

When a gun insertion signal is detected, the BMS generates a corresponding SOC correction request, see the first pulse of the SOC correction request in fig. 2. At this time, the SOC value of the battery increases as the charging of the battery proceeds. And if the SOC value of the storage battery does not reach the first threshold value, detecting that the gun inserting signal is ended, ending the SOC correction request, and in the AC/DC charging process, not successfully finishing the correction of the SOC of the storage battery, and waiting for the next AC/DC charging. At the moment, the fully charged SOC is continuously kept at the second threshold value, and the accumulated working time of the storage battery is continuously counted.

When the next gun insertion signal is detected, an SOC correction request is generated, such as the third pulse of the gun insertion signal in fig. 2, the second pulse in the SOC correction request. The SOC value of the battery gradually increases as the charging of the battery proceeds, and the voltage of the battery is detected when the SOC value of the battery exceeds the first threshold value and continues to increase, and the SOC of the battery is corrected to the second threshold value when the voltage of the battery reaches the first voltage threshold value. After correcting the SOC of the battery to the second threshold value, the SOC correction request is terminated, and a discharge signal (see fig. 2, a pulse corresponding to the discharge signal) is generated, from which the full charge SOC is pulled down to the first threshold value. In response to the discharge signal, the preset component may be invoked to discharge the battery until it is detected that the SOC value of the battery has decreased to a third threshold value. Wherein the third threshold may be the same as the first threshold.

And after the SOC of the storage battery is reduced to a third threshold value, stopping the gun inserting signal, stopping the discharging signal, finishing the SOC correction of the storage battery at this time, resetting the accumulated working time of the storage battery, timing again, continuously detecting the accumulated working time of the storage battery, and entering the next SOC correction of the storage battery when the accumulated working time of the storage battery reaches a correction period.

The SOC correction method of the battery provided by the above embodiment may be performed by the BMS.

The embodiment of the invention also provides a SOC correction device of the storage battery. Referring to fig. 3, a schematic structural diagram of an SOC correction apparatus for a battery according to an embodiment of the present invention is shown. The SOC correction device 30 of the battery may include:

an operating time monitoring unit 31 for monitoring the accumulated operating time of the storage battery;

the correction unit 32 is configured to, when the storage battery is charged by using an external power supply, correct the SOC value of the storage battery if it is monitored that the accumulated operating time of the storage battery satisfies a correction condition, where the correction condition includes a correction cycle, and the correction cycle is determined based on an SOC accumulated error rising speed of the storage battery and an error tolerance of the SOC.

In a specific implementation, the specific working principle and the working process of the SOC correction device 30 for the storage battery may refer to the description of the SOC correction method for the storage battery provided in the foregoing embodiment of the present invention, and are not described herein again.

Embodiments of the present invention further provide a storage medium, where the storage medium is a non-volatile storage medium or a non-transitory storage medium, and a computer program is stored on the storage medium, where the computer program is executed by a processor to perform the steps of the SOC correction method for a storage battery according to any of the above embodiments of the present invention.

The embodiment of the present invention further provides a terminal, which includes a memory and a processor, where the memory stores a computer program capable of running on the processor, and the processor executes the steps of the SOC correction method for a storage battery provided in any of the above embodiments of the present invention when running the computer program.

Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by hardware related to instructions of a program, and the program may be stored in any computer-readable storage medium, and the storage medium may include: ROM, RAM, magnetic or optical disks, and the like.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A method for correcting SOC of a battery, comprising:

monitoring the accumulated working time of the storage battery;

when an external power supply is used for charging the storage battery, if the accumulated working time of the storage battery is monitored to meet a correction condition, correcting the SOC value of the storage battery;

wherein the correction condition includes a correction period that is determined based on an SOC accumulated error rising speed of the battery and an error allowable deviation of the SOC.

2. The SOC correction method for a storage battery according to claim 1, wherein the error tolerance of the SOC includes a first deviation that is a maximum deviation of the allowed estimated SOC value greater than the true SOC value and/or a second deviation that is a maximum deviation of the allowed estimated SOC value less than the true SOC value.

3. The SOC correction method for a storage battery according to claim 2, characterized in that the correction cycle is determined in the following manner:

estimating a first time length required when the deviation of the SOC estimation value greater than the SOC true value reaches the first deviation according to the rising speed of the SOC accumulated error;

estimating a second time length required when the deviation of the SOC estimated value smaller than the SOC true value reaches the second deviation according to the rising speed of the SOC accumulated error;

and determining the correction period according to the first time length and/or the second time length.

4. The method for correcting the SOC of the battery according to any one of claims 1 to 3, wherein the correcting the SOC value of the battery if it is monitored that the accumulated operating time period of the battery satisfies the correction condition includes:

when the accumulated working time of the storage battery is monitored to reach the correction period, the full charge SOC value of the storage battery is increased from a first threshold value to a second threshold value;

when a gun inserting signal is detected, generating an SOC correction request;

detecting a charging voltage of the storage battery;

when the charging voltage of the storage battery is detected to reach a first voltage threshold value, the SOC value corresponding to the first voltage threshold value is corrected to be the second threshold value in response to the SOC correction request.

5. The SOC correction method for a storage battery according to claim 4, characterized by further comprising:

and after the SOC value corresponding to the first voltage threshold value is corrected to the second threshold value, reducing the full charge SOC value from the second threshold value to the first threshold value.

6. The SOC correction method for a storage battery according to claim 4, characterized by further comprising:

after the SOC value corresponding to the first voltage threshold value is corrected to the second threshold value, the SOC correction request is terminated, and a discharging request is generated;

in response to the discharging request, calling a designated component to discharge the storage battery until the SOC value of the storage battery is reduced to a third threshold value;

and after the SOC value of the storage battery is reduced to a third threshold value, resetting the accumulated working time of the storage battery, and monitoring the accumulated working time of the storage battery again.

7. The SOC correction method for a battery according to claim 2,

determining the first deviation as follows: calculating a difference value between a preset SOC lower limit value and an actual SOC lower limit value according to the preset SOC lower limit value and the actual SOC lower limit value, and determining the first deviation according to the difference value;

determining said second deviation in the following manner: and determining the second deviation according to the actual value of the SOC, the deceleration specified by the regulation and the preset SOC upper limit value.

8. An SOC correction device for a battery, comprising:

the working time monitoring unit is used for monitoring the accumulated working time of the storage battery;

the correction unit is used for correcting the SOC value of the storage battery if the accumulated working time of the storage battery is monitored to meet a correction condition when the storage battery is charged by an external power supply, wherein the correction condition comprises a correction period, and the correction period is determined based on the SOC accumulated error rising speed of the storage battery and the error tolerance of the SOC.

9. A storage medium, which is a non-volatile storage medium or a non-transitory storage medium, having a computer program stored thereon, wherein the computer program, when executed by a processor, performs the steps of the SOC correction method for a secondary battery according to any one of claims 1 to 7.

10. A terminal comprising a memory and a processor, the memory having stored thereon a computer program operable on the processor, characterized in that the processor, when executing the computer program, performs the steps of the SOC correction method for a battery according to any one of claims 1 to 7.