Lithium battery discharge display SOC correction method, device, equipment and medium

Abstract

The present application discloses a method, device, equipment and medium for correcting the discharge display SOC of a lithium battery. On the one hand, the method determines the maximum total charge that can be discharged by the lithium battery at different temperatures through the battery capacity distribution, and determines the temperature loss of the lithium battery caused by the temperature influence based on the initial battery temperature, the current battery temperature and the ratio of the initial available charge; on the other hand, the DC internal resistance value of the lithium battery at different temperatures and different discharge currents is determined through the DC internal resistance distribution, and then the corrected ampere-hour integral of the lithium battery caused by the change in the discharge current is determined based on the battery capacity distribution, the real-time battery temperature, the current battery temperature, the rated total charge, the remaining life ratio, the real-time current, the rated current, the rated voltage and the remaining life ratio; finally, the discharge display SOC is obtained without the interference of the battery temperature and the discharge current, thereby effectively improving the display accuracy of the discharge display SOC.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium batteries, and in particular to a method, device, equipment and medium for correcting the SOC displayed by a lithium battery discharge. Background Art

[0002] The new energy vehicle industry is booming, and new energy vehicles using lithium batteries as energy storage devices are becoming increasingly popular. As a key indicator of a battery's remaining charge, SOC (State of Charge) is particularly important. Accurately estimating a battery's SOC value enables users to more accurately predict the remaining battery life during use.

[0003] Currently, the SOC value is mainly calculated using the ampere-hour integration method. However, the actual discharge capacity of the battery varies greatly at different temperatures and discharge currents. The ampere-hour integration method does not consider the impact of the battery temperature and discharge current on the battery capacity during the discharge process of the lithium battery, resulting in low accuracy of the discharge SOC display.

[0004] Therefore, in the prior art, when obtaining the discharge SOC of a lithium battery, there is a problem in that the discharge SOC display accuracy is low because the battery temperature and the discharge current are not taken into consideration. Summary of the Invention

[0005] In view of this, it is necessary to provide a method, device, equipment and medium for correcting the SOC displayed by the discharge of a lithium battery, so as to solve the problem of low measurement efficiency in the process of hole measurement in the prior art.

[0006] In order to solve the above problems, the present invention provides a method for correcting the SOC displayed by a lithium battery during discharge, comprising:

[0007] Obtain the battery capacity distribution and DC internal resistance distribution of lithium batteries at different temperatures;

[0008] Obtain the real-time battery temperature, initial battery temperature, current battery temperature, initial available charge ratio, rated total charge, remaining life ratio, real-time current, rated current, rated voltage, and remaining life ratio of the lithium battery;

[0009] Determine the temperature loss of the lithium battery based on the battery capacity distribution, initial battery temperature, current battery temperature and initial available charge ratio;

[0010] Determine the corrected ampere-hour integral of the lithium battery based on battery capacity distribution, DC internal resistance distribution, real-time battery temperature, current battery temperature, rated total charge, remaining life ratio, real-time current, rated current, rated voltage, and remaining life ratio;

[0011] The discharge display SOC of the lithium battery is corrected according to the temperature loss and the corrected ampere-hour integral.

[0012] Furthermore, obtaining the battery capacity distribution of the lithium battery at different temperatures includes:

[0013] Obtaining a first total charge amount discharged by the lithium battery when discharging at a first preset temperature and according to a first preset current;

[0014] Determining a plurality of first adjacent temperatures of the first preset temperature according to a first preset temperature interval;

[0015] Discharging at a plurality of first adjacent temperatures according to a first preset current, thereby obtaining a plurality of corresponding adjacent total charges;

[0016] A battery capacity distribution is determined based on the first total charge amount and a plurality of adjacent total charge amounts.

[0017] Furthermore, obtaining the DC internal resistance distribution of the lithium battery at different temperatures includes:

[0018] Obtaining a first internal resistance value of the direct current internal resistance of the lithium battery at a second preset temperature when a second preset current flows through the battery;

[0019] Determining a plurality of second adjacent temperatures of the second preset temperature according to a second preset temperature interval;

[0020] Determining a plurality of adjacent currents of the second preset current according to a preset current spacing;

[0021] According to the plurality of second adjacent temperatures and the plurality of adjacent currents, respectively determining a plurality of internal resistance values ​​of the lithium battery at different adjacent temperatures and when different adjacent currents flow therethrough;

[0022] A DC internal resistance distribution is determined according to the first internal resistance value and the multiple internal resistance values.

[0023] Furthermore, the temperature loss of the lithium battery is determined based on the battery capacity distribution, the initial battery temperature, the current battery temperature, and the initial available charge ratio, including:

[0024] Determine the initial temperature coefficient and current temperature coefficient of the lithium battery according to the battery capacity distribution, the initial battery temperature and the current battery temperature;

[0025] The temperature loss is determined according to the temperature loss calculation formula based on the initial temperature coefficient, the current temperature coefficient and the ratio of the initial available charge.

[0026] Furthermore, according to the battery capacity distribution, the initial battery temperature and the current battery temperature, the initial temperature coefficient and the current temperature coefficient of the lithium battery are determined respectively, including:

[0027] Determine, according to the battery capacity distribution, the initial battery temperature, and the current battery temperature, the initial battery capacity corresponding to the initial battery temperature and the current battery capacity corresponding to the current battery temperature;

[0028] According to the initial battery capacity, the current battery capacity and the temperature coefficient conversion formula, the initial temperature coefficient and the current temperature coefficient are determined respectively.

[0029] Furthermore, the corrected ampere-hour integral of the lithium battery is determined based on the battery capacity distribution, the DC internal resistance distribution, the real-time battery temperature, the current battery temperature, the rated total charge, the remaining life ratio, the real-time current, the rated current, the rated voltage, and the remaining life ratio, including:

[0030] Determine the real-time discharge efficiency corresponding to the real-time current based on the DC internal resistance distribution, real-time battery temperature, real-time current and rated voltage;

[0031] Determine the rated discharge efficiency based on the DC internal resistance distribution, real-time battery temperature, rated current and rated voltage;

[0032] Determine the real-time discharge rate coefficient of the lithium battery based on the real-time discharge efficiency and the rated discharge efficiency;

[0033] Determine the current temperature coefficient based on the battery capacity distribution and the current battery temperature;

[0034] The corrected ampere-hour integral is determined based on the real-time discharge rate coefficient, real-time current, current temperature coefficient, rated total charge and remaining life ratio.

[0035] Furthermore, the real-time discharge efficiency corresponding to the real-time current is determined based on the DC internal resistance distribution, the real-time battery temperature, the real-time current, and the rated voltage, including:

[0036] Determine the real-time DC internal resistance of the lithium battery based on the DC internal resistance distribution and real-time battery temperature;

[0037] The real-time discharge efficiency is determined based on the real-time DC internal resistance, real-time current and rated voltage using the discharge efficiency calculation formula.

[0038] In order to solve the above problems, the present invention also provides a device for correcting the SOC displayed by a lithium battery during discharge, comprising:

[0039] Basic distribution data acquisition module, used to obtain battery capacity distribution and DC internal resistance distribution of lithium batteries at different temperatures;

[0040] The battery parameter acquisition module is used to obtain the real-time battery temperature, initial battery temperature, current battery temperature, initial available charge ratio, rated total charge, remaining life ratio, real-time current, rated current, rated voltage and remaining life ratio of the lithium battery;

[0041] A temperature loss acquisition module is used to determine the temperature loss of the lithium battery based on the battery capacity distribution, the initial battery temperature, the current battery temperature and the ratio of the initial available charge;

[0042] A corrected ampere-hour integral acquisition module is used to determine the corrected ampere-hour integral of the lithium battery based on the battery capacity distribution, DC internal resistance distribution, real-time battery temperature, current battery temperature, rated total charge, remaining life ratio, real-time current, rated current, rated voltage and remaining life ratio;

[0043] The discharge display correction module is used to correct the discharge display SOC of the lithium battery according to the temperature loss and the corrected ampere-hour integral.

[0044] In order to solve the above problems, the present invention also provides an electronic device, including a processor and a memory, wherein a computer program is stored in the memory. When the computer program is executed by the processor, the method for correcting the lithium battery discharge display SOC as described above is implemented.

[0045] In order to solve the above problem, the present invention further provides a storage medium storing computer program instructions. When the computer program instructions are executed by a computer, the computer executes the method for correcting the lithium battery discharge display SOC as described above.

[0046] The beneficial effects of adopting the above technical solution are as follows: the present invention provides a method, device, equipment and medium for correcting the discharge display SOC of a lithium battery. On the one hand, the method determines the maximum total charge that can be discharged by the lithium battery at different temperatures through the battery capacity distribution, and determines the temperature loss of the lithium battery caused by temperature influence based on the initial battery temperature, the current battery temperature and the ratio of the initial available charge; on the other hand, the DC internal resistance value of the lithium battery at different temperatures and different discharge currents is determined through the DC internal resistance distribution, and then based on the battery capacity distribution, the real-time battery temperature, the current battery temperature, the rated total charge, the remaining life ratio, the real-time current, the rated current, the rated voltage and the remaining life ratio, the corrected ampere-hour integral of the lithium battery caused by the change in the discharge current is determined; finally, the discharge display SOC is obtained without the interference of the battery temperature and the discharge current, thereby effectively improving the display accuracy of the discharge display SOC. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 A flow chart of an embodiment of a method for correcting the SOC displayed by a lithium battery during discharge provided by the present invention;

[0048] Figure 2 A schematic diagram of a flow chart of an embodiment of obtaining the battery capacity distribution of a lithium battery at different temperatures provided by the present invention;

[0049] Figure 3 A schematic diagram of a flow chart of an embodiment of obtaining the DC internal resistance distribution of a lithium battery at different temperatures provided by the present invention;

[0050] Figure 4 A schematic diagram of a flow chart of an embodiment of determining the temperature loss of a lithium battery provided by the present invention;

[0051] Figure 5 A schematic diagram of a flow chart of an embodiment of determining the initial temperature coefficient and current temperature coefficient of a lithium battery provided by the present invention;

[0052] Figure 6 A schematic diagram of a flow chart of an embodiment of determining the corrected ampere-hour integral of a lithium battery provided by the present invention;

[0053] Figure 7 A schematic diagram of a flow chart of an embodiment of determining the real-time discharge efficiency corresponding to the real-time current provided by the present invention;

[0054] Figure 8 A schematic structural diagram of an embodiment of a device for correcting the SOC displayed by a lithium battery discharge provided by the present invention;

[0055] Figure 9 This is a structural block diagram of an embodiment of an electronic device provided by the present invention. DETAILED DESCRIPTION

[0056] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, and are not used to limit the scope of the present invention.

[0057] Before describing the embodiments, SOC, fluoroscopic imaging, and nuclear line imaging are first explained:

[0058] SOC (State of Charge), also known as the state of charge, indicates the ratio of a battery's remaining capacity to its total available capacity after use or long-term storage, usually expressed as a percentage. Its value range is 0-100%. When SOC = 0%, the battery is fully discharged, and when SOC = 100%, the battery is fully charged.

[0059] At present, the SOC value is mainly calculated by the ampere-hour integration method, and the calculation formula is:

[0060]

[0061] Among them, SOC is the percentage of available charge at the current moment, SOC0 is the percentage of available charge at the initial state, SOH is the remaining battery life at the current moment, C N is the rated total charge of the battery.

[0062] Understandably, the ampere-hour integration method for calculating SOC doesn't account for the effects of battery temperature and discharge current on the battery's capacity during discharge. However, battery temperature and discharge current significantly impact the battery's discharge capacity and, consequently, the accuracy of the SOC display.

[0063] Specifically, under 1C discharge conditions, the amount of electricity that a certain lithium iron phosphate battery can discharge at -25°C is only about 80% of that at 25°C.

[0064] 1C discharge refers to the rated discharge current of the battery cell. For example, the 1C current of a 20Ah battery cell is 20A.

[0065] Therefore, in the prior art, when obtaining the discharge SOC of a lithium battery, there is a problem in that the discharge SOC display accuracy is low because the battery temperature and the discharge current are not taken into consideration.

[0066] In order to solve the above problems, the present invention provides a method, device, equipment and medium for correcting the SOC displayed by the discharge of a lithium battery, which are described in detail below.

[0067] like Figure 1 As shown, Figure 1 A flow chart of an embodiment of a method for correcting the SOC displayed by a lithium battery during discharge provided by the present invention includes:

[0068] Step S101: obtaining the battery capacity distribution and DC internal resistance distribution of the lithium battery at different temperatures.

[0069] Step S102: Acquire the real-time battery temperature, initial battery temperature, current battery temperature, initial available charge ratio, rated total charge, remaining life ratio, real-time current, rated current, rated voltage and remaining life ratio of the lithium battery.

[0070] Step S103: determining the temperature loss of the lithium battery according to the battery capacity distribution, the initial battery temperature, the current battery temperature and the ratio of the initial available charge.

[0071] Step S104: Determine the corrected ampere-hour integral of the lithium battery based on the battery capacity distribution, DC internal resistance distribution, real-time battery temperature, current battery temperature, rated total charge, remaining life ratio, real-time current, rated current, rated voltage, and remaining life ratio.

[0072] Step S105: Correcting the discharge display SOC of the lithium battery according to the temperature loss and the corrected ampere-hour integral.

[0073] In this embodiment, first, the battery capacity distribution and DC internal resistance distribution of the lithium battery at different temperatures are obtained to determine the specific impact of the battery temperature and discharge current on the lithium battery; secondly, the real-time battery temperature, initial battery temperature, current battery temperature, initial available charge ratio, rated total charge, remaining life ratio, real-time current, rated current, rated voltage and remaining life ratio of the lithium battery are obtained; next, the temperature loss of the lithium battery is determined based on the battery capacity distribution, initial battery temperature, current battery temperature and initial available charge ratio; then, the corrected ampere-hour integral of the lithium battery is determined based on the battery capacity distribution, DC internal resistance distribution, real-time battery temperature, current battery temperature, rated total charge, remaining life ratio, real-time current, rated current, rated voltage and remaining life ratio; finally, the discharge displayed SOC of the lithium battery is corrected based on the temperature loss and the corrected ampere-hour integral.

[0074] It can be understood that in this embodiment, on the one hand, the maximum total charge that can be discharged by the lithium battery at different temperatures is determined through the battery capacity distribution, and the temperature loss of the lithium battery caused by temperature is determined based on the initial battery temperature, the current battery temperature and the ratio of the initial available charge; on the other hand, the DC internal resistance value of the lithium battery at different temperatures and different discharge currents is determined through the DC internal resistance distribution, and then based on the battery capacity distribution, the real-time battery temperature, the current battery temperature, the rated total charge, the remaining life ratio, the real-time current, the rated current, the rated voltage and the remaining life ratio, the corrected ampere-hour integral of the lithium battery caused by the change in discharge current is determined; finally, the discharge display SOC is obtained without the interference of the battery temperature and the discharge current, thereby effectively improving the display accuracy of the discharge display SOC.

[0075] As a preferred embodiment, in step S101, in order to obtain the battery capacity distribution of the lithium battery at different temperatures, such as Figure 2 As shown, Figure 2 A schematic flow chart of an embodiment of obtaining the battery capacity distribution of a lithium battery at different temperatures provided by the present invention includes:

[0076] Step S111: obtaining a first total charge amount discharged by the lithium battery at a first preset temperature and a first preset current.

[0077] Step S112: determining a plurality of first adjacent temperatures of the first preset temperature according to the first preset temperature interval.

[0078] Step S113: discharging at a plurality of first adjacent temperatures according to a first preset current, to obtain a plurality of corresponding adjacent total charges.

[0079] Step S114: determining a battery capacity distribution according to the first total charge amount and a plurality of adjacent total charge amounts.

[0080] In this embodiment, on the basis of determining the first preset temperature, by setting the first preset temperature interval, all possible operating temperatures of the lithium battery are divided into multiple first temperature intervals. Through actual measurement, the maximum total charge that can be discharged by the lithium battery at the first edge temperature of each first temperature interval and discharging according to the first preset current is obtained, thereby determining the total charge corresponding to the lithium battery at multiple temperatures, that is, the first total charge and multiple adjacent total charge amounts. Finally, for the convenience of data processing, the total charge that can be discharged by the lithium battery in each first temperature interval is preset to be linearly distributed, thereby obtaining the maximum total charge that can be discharged by the lithium battery at all possible operating temperatures, that is, determining the battery capacity distribution.

[0081] In a specific embodiment, the first preset temperature is preferably 10°C, and the first preset temperature interval is preferably 5°C.

[0082] Since the operating temperature of lithium batteries is generally -30℃~60℃, in the actual production process, the temperatures that need to be tested are -30℃, -25℃,..., 55℃, 60℃, a total of 19 first edge temperatures, corresponding to 19 total charge amounts when discharging according to the first preset current.

[0083] In a specific embodiment, the first preset current is preferably 1C, that is, the rated current of the lithium battery.

[0084] In other embodiments, the first preset temperature, the first preset temperature interval, and the first preset current may also be set to other values ​​according to actual needs, which will not be elaborated here.

[0085] Furthermore, in step S114, in order to determine the battery capacity distribution, that is, to obtain the total charge corresponding to the untested temperature, since the lithium battery will not undergo sudden changes when affected by temperature, in order to simplify the calculation, it is stipulated that the total charge in each first temperature interval is linearly distributed with the temperature.

[0086] In one embodiment, the total charge at 7° C. is calculated as follows:

[0087]

[0088] By summarizing the above formulas, the general total charge calculation formula is:

[0089]

[0090] Wherein, n is the first preset temperature interval, k is (1, n), and m is a positive integer.

[0091] By calculating the total charge in each first temperature interval in the above manner, the total charge corresponding to discharge according to the first preset current at all temperatures can be obtained, that is, the total charge corresponding to the lithium battery at any operating temperature during operation can be obtained, thereby determining the battery capacity distribution.

[0092] In other embodiments, when the first preset current is set to other values, the above method for obtaining the battery capacity distribution is still applicable and will not be described in detail here.

[0093] Furthermore, in order to obtain the DC internal resistance distribution of lithium batteries at different temperatures, as Figure 3 As shown, Figure 3 A schematic flow chart of an embodiment of obtaining the DC internal resistance distribution of a lithium battery at different temperatures provided by the present invention includes:

[0094] Step S211: obtaining a first internal resistance value of the direct current internal resistance of the lithium battery at a second preset temperature and when a second preset current flows through the battery.

[0095] Step S212: determining a plurality of second adjacent temperatures of the second preset temperature according to the second preset temperature interval.

[0096] Step S213: determining a plurality of adjacent currents of the second preset current according to the preset current interval.

[0097] Step S214: determining, based on the plurality of second adjacent temperatures and the plurality of adjacent currents, a plurality of internal resistance values ​​of the lithium battery at different adjacent temperatures and when different adjacent currents flow therethrough.

[0098] Step S215: determining a DC internal resistance distribution according to the first internal resistance value and the multiple internal resistance values.

[0099] In this embodiment, based on obtaining the first internal resistance value of the lithium battery when it is at a second preset temperature and passes a second preset current, the operating temperature that the lithium battery may be in during operation is divided into multiple second temperature intervals by setting a second preset temperature interval; the current that may pass through the lithium battery during operation is divided into multiple current intervals by setting a preset current interval; based on the second edge temperature of the second temperature interval and the edge current of the current interval, the DC internal resistance value of the lithium battery at each second edge temperature and each current interval is obtained through actual measurement, that is, the first internal resistance value and multiple internal resistance values. Finally, in order to facilitate data processing, it is preset that the internal resistance value of the lithium battery in each second edge temperature and each current interval is linearly distributed, so as to obtain all internal resistance values ​​corresponding to the lithium battery at all possible operating temperatures and all possible currents, that is, determine the DC internal resistance distribution.

[0100] In a specific embodiment, the second preset temperature is preferably the same as the first preset temperature, and the second preset temperature interval is preferably the same as the first preset temperature interval.

[0101] In a specific embodiment, the second preset current is preferably 1C, and the preset current interval is preferably 1C. Furthermore, in order to ensure the integrity of the second preset current, it is necessary to increase the current to and two second preset currents.

[0102] In other embodiments, the second preset temperature, the second preset temperature interval and the second preset current can also be set to other values ​​according to actual needs, and the second preset current corresponding to certain special values ​​can also be obtained according to actual needs to ensure that the required complete second preset current can be obtained, which will not be elaborated here.

[0103] Furthermore, in step S215, in order to determine the DC internal resistance distribution, that is, to obtain the DC internal resistance corresponding to the untested temperature and the untested current, since the lithium battery will not undergo sudden changes when affected by temperature and current, in order to simplify the calculation, it is stipulated that the DC internal resistance value in each second temperature interval is linearly distributed with the temperature, and it is stipulated that the DC internal resistance value in each current interval is linearly distributed with the current.

[0104] In a specific embodiment, for 7°C, the DC internal resistance DCR corresponding to the 1.5C current is 7℃ / 1.5C , you need to select DCR 5℃ / 1C , DCR 10℃ / 1C , DCR 5℃ / 2C , DCR 10℃ / 2C Four test values ​​are calculated, and the calculation formula is:

[0105]

[0106] By summarizing the above formulas, the general calculation formula for DC internal resistance is:

[0107]

[0108] Wherein, n is the second preset temperature interval, a is the preset current interval, k is (1, n), d is (1, a), and m and b are both positive integers.

[0109] By calculating the DC internal resistance value corresponding to each second temperature interval in the above manner, the DC internal resistance value corresponding to discharge according to the second preset current at all temperatures can be obtained, that is, the DC internal resistance value corresponding to the lithium battery at any operating temperature during operation can be obtained; by calculating the DC internal resistance value corresponding to each current interval in the above manner, the DC internal resistance value corresponding to the lithium battery when current of all values ​​passes through the lithium battery can be obtained; finally, the DC internal resistance value corresponding to the lithium battery when discharged by any current value at any temperature can be obtained.

[0110] As a preferred embodiment, in step S103, in order to determine the temperature loss of the lithium battery, as shown in FIG. Figure 4 As shown, Figure 4 A flow chart of an embodiment of determining the temperature loss of a lithium battery provided by the present invention includes:

[0111] Step S131: determining the initial temperature coefficient and the current temperature coefficient of the lithium battery according to the battery capacity distribution, the initial battery temperature and the current battery temperature.

[0112] Step S132: determining the temperature loss according to the initial temperature coefficient, the current temperature coefficient and the ratio of the initial available charge and the temperature loss calculation formula.

[0113] In this embodiment, first, the initial temperature coefficient and current temperature coefficient of the lithium battery are determined respectively based on the battery capacity distribution, the initial battery temperature and the current battery temperature; then, based on the temperature loss calculation formula, the initial temperature coefficient, the current temperature coefficient and the ratio of the initial available charge are processed to determine the temperature loss.

[0114] In one embodiment, the temperature loss Q T The calculation formula is:

[0115]

[0116] Among them, Q T is the temperature loss, C N is the rated total charge of the battery, SOH is the remaining battery life at the current moment, K T0 is the initial temperature coefficient, SOC0 is the percentage of available charge in the initial state, K T is the temperature coefficient.

[0117] As a preferred embodiment, in step S131, in order to determine the initial temperature coefficient and the current temperature coefficient of the lithium battery, as shown in FIG. Figure 5 As shown, Figure 5 A schematic flow chart of an embodiment of determining the initial temperature coefficient and current temperature coefficient of a lithium battery provided by the present invention includes:

[0118] Step S1311 : determining the initial battery capacity corresponding to the initial battery temperature and the current battery capacity corresponding to the current battery temperature according to the battery capacity distribution, the initial battery temperature and the current battery temperature.

[0119] Step S1312: Determine the initial temperature coefficient and the current temperature coefficient according to the initial battery capacity, the current battery capacity and the temperature coefficient conversion formula.

[0120] In this embodiment, first, based on the battery capacity distribution, the initial battery temperature, and the current battery temperature, the initial battery capacity corresponding to the initial battery temperature and the current battery capacity corresponding to the current battery temperature are determined respectively; then, based on the temperature coefficient conversion formula, the initial temperature coefficient and the current temperature coefficient are determined respectively.

[0121] In a specific embodiment, the temperature coefficient conversion formula is:

[0122]

[0123] Among them, K T is the temperature coefficient, C T is the battery capacity at temperature T.

[0124] In this embodiment, the calculation is performed based on the battery capacity corresponding to 25°C.

[0125] In other embodiments, the battery capacity corresponding to other temperatures may be adjusted according to actual needs.

[0126] As a preferred embodiment, in step S104, in order to determine the corrected ampere-hour integral of the lithium battery, as shown in FIG. Figure 6 As shown, Figure 6 A flow chart of an embodiment of determining the corrected ampere-hour integral of a lithium battery provided by the present invention includes:

[0127] Step S141: determining a real-time discharge efficiency corresponding to the real-time current according to the DC internal resistance distribution, the real-time battery temperature, the real-time current, and the rated voltage.

[0128] Step S142: Determine the rated discharge efficiency according to the DC internal resistance distribution, the real-time battery temperature, the rated current, and the rated voltage.

[0129] Step S143: determining the real-time discharge rate coefficient of the lithium battery according to the real-time discharge efficiency and the rated discharge efficiency.

[0130] Step S144: Determine the current temperature coefficient according to the battery capacity distribution and the current battery temperature.

[0131] Step S145: determining the corrected ampere-hour integral according to the real-time discharge rate coefficient, the real-time current, the current temperature coefficient, the rated total charge, and the remaining life ratio.

[0132] In this embodiment, first, the real-time discharge efficiency corresponding to the real-time current is determined based on the DC internal resistance distribution, the real-time battery temperature, the real-time current and the rated voltage; secondly, the rated discharge efficiency is determined based on the DC internal resistance distribution, the real-time battery temperature, the rated current and the rated voltage; next, the real-time discharge rate coefficient of the lithium battery is determined based on the real-time discharge efficiency and the rated discharge efficiency; then, the current temperature coefficient is determined based on the battery capacity distribution and the current battery temperature; finally, the corrected ampere-hour integral is determined based on the real-time discharge rate coefficient, the real-time current, the current temperature coefficient, the rated total charge and the remaining life ratio.

[0133] In this embodiment, the DC internal resistance of the lithium battery under the influence of different temperatures and currents is used as a parameter for correcting the ampere-hour integral, thereby improving the accuracy of the lithium battery power consumption value obtained by the corrected ampere-hour integral, thereby reducing the influence of the discharge current on the accuracy of the discharge display SOC.

[0134] As a preferred embodiment, in step S141, in order to determine the real-time discharge efficiency corresponding to the real-time current, as shown in FIG. Figure 7 As shown, Figure 7 A flow chart of an embodiment of determining the real-time discharge efficiency corresponding to the real-time current provided by the present invention includes:

[0135] Step S1411: determining the real-time DC internal resistance of the lithium battery according to the DC internal resistance distribution and the real-time battery temperature.

[0136] Step S1412: determining the real-time discharge efficiency according to the real-time DC internal resistance, the real-time current and the rated voltage using a discharge efficiency calculation formula.

[0137] In this embodiment, first, the real-time DC internal resistance of the lithium battery is determined based on the DC internal resistance distribution and the real-time battery temperature, that is, the DC internal resistance value at each moment is obtained; then, based on the discharge efficiency calculation formula, the real-time DC internal resistance, real-time current and rated voltage are processed to determine the real-time discharge efficiency.

[0138] In a specific embodiment, the calculation formula for discharge efficiency is:

[0139]

[0140] Among them, η T / I is the discharge efficiency, U N is the rated voltage, I is the current, DCR T / I is the DC internal resistance when the temperature is T and the current is I.

[0141] In this embodiment, the calculation is performed based on the discharge efficiency corresponding to 1C.

[0142] In other embodiments, the discharge efficiency may be adjusted to other currents according to actual needs.

[0143] In a specific embodiment, the calculation formula of the discharge rate coefficient is:

[0144]

[0145] Among them, M T / I is the discharge rate coefficient.

[0146] In a specific embodiment, the calculation formula for the corrected ampere-hour integral is:

[0147]

[0148] As a preferred embodiment, in step S105, the calculation formula of the corrected discharge display SOC is:

[0149] SOC T =1-Q T -SOC M

[0150] Through the above method, on the one hand, the maximum total charge that can be discharged by the lithium battery at different temperatures is determined through the battery capacity distribution, and the temperature loss of the lithium battery caused by temperature is determined based on the initial battery temperature, the current battery temperature and the ratio of the initial available charge; on the other hand, the DC internal resistance value of the lithium battery at different temperatures and different discharge currents is determined through the DC internal resistance distribution, and then based on the battery capacity distribution, the real-time battery temperature, the current battery temperature, the rated total charge, the remaining life ratio, the real-time current, the rated current, the rated voltage and the remaining life ratio, the corrected ampere-hour integral of the lithium battery caused by the change in discharge current is determined; finally, the discharge display SOC is obtained without the interference of the battery temperature and the discharge current, thereby effectively improving the display accuracy of the discharge display SOC.

[0151] In order to solve the above problems, the present invention also provides a device for correcting the SOC of a lithium battery discharge display. Figure 8 As shown, Figure 8 This is a schematic structural diagram of an embodiment of a device for correcting the SOC displayed by a lithium battery during discharge provided by the present invention. The device 800 for correcting the SOC displayed by a lithium battery during discharge includes:

[0152] Basic distribution data acquisition module 801, used to obtain battery capacity distribution and DC internal resistance distribution of lithium batteries at different temperatures;

[0153] The battery parameter acquisition module 802 is used to obtain the real-time battery temperature, initial battery temperature, current battery temperature, initial available charge ratio, rated total charge, remaining life ratio, real-time current, rated current, rated voltage and remaining life ratio of the lithium battery;

[0154] The temperature loss acquisition module 803 is used to determine the temperature loss of the lithium battery based on the battery capacity distribution, the initial battery temperature, the current battery temperature and the initial available charge ratio;

[0155] The corrected ampere-hour integral acquisition module 804 is used to determine the corrected ampere-hour integral of the lithium battery based on the battery capacity distribution, DC internal resistance distribution, real-time battery temperature, current battery temperature, rated total charge, remaining life ratio, real-time current, rated current, rated voltage, and remaining life ratio;

[0156] The discharge display correction module 805 is used to correct the discharge display SOC of the lithium battery according to the temperature loss and the corrected ampere-hour integral.

[0157] The present invention also provides an electronic device, such as Figure 9 As shown, Figure 9 This is a block diagram of an electronic device according to an embodiment of the present invention. Electronic device 900 can be a computing device such as a mobile terminal, desktop computer, notebook computer, PDA, or server. Electronic device 900 includes a processor 901 and a memory 902. Memory 902 stores a program 903 for correcting the state of charge (SOC) of a lithium battery during discharge.

[0158] In some embodiments, the memory 902 may be an internal storage unit of a computer device, such as a hard disk or memory of the computer device. In other embodiments, the memory 902 may also be an external storage device of the computer device, such as a plug-in hard disk equipped on the computer device, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. Furthermore, the memory 902 may also include both an internal storage unit of the computer device and an external storage device. The memory 902 is used to store application software and various types of data installed on the computer device, such as program codes installed on the computer device. The memory 902 may also be used to temporarily store data that has been output or is to be output. In one embodiment, the lithium battery discharge display SOC correction program 903 can be executed by the processor 901, thereby realizing the lithium battery discharge display SOC correction method of each embodiment of the present invention.

[0159] In some embodiments, the processor 901 may be a central processing unit (CPU), a microprocessor, or other data processing chip, configured to execute program codes or process data stored in the memory 902, such as executing a correction program for displaying the SOC of a lithium battery during discharge.

[0160] This embodiment further provides a computer-readable storage medium on which a correction program for the lithium battery discharge display SOC is stored. When the computer program is executed by a processor, the correction method for the lithium battery discharge display SOC as described in any of the above technical solutions is implemented.

[0161] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Any reference to memory, storage, database or other storage medium used in the embodiments provided in this application may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0162] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed in the present invention should be covered by the scope of protection of the present invention.

Claims

1. A method for correcting the SOC displayed by a lithium battery discharge, characterized in that: include: Obtaining battery capacity distribution and DC internal resistance distribution of the lithium battery at different temperatures; Obtaining the real-time battery temperature, initial battery temperature, current battery temperature, initial available charge ratio, rated total charge, remaining life ratio, real-time current, rated current, rated voltage, and remaining life ratio of the lithium battery; determining a temperature loss of the lithium battery according to the battery capacity distribution, the initial battery temperature, the current battery temperature, and the initial available charge ratio; determining a corrected ampere-hour integral of the lithium battery according to the battery capacity distribution, the DC internal resistance distribution, the real-time battery temperature, the current battery temperature, the rated total charge, the remaining life ratio, the real-time current, the rated current, the rated voltage, and the remaining life ratio; The discharge display SOC of the lithium battery is corrected according to the temperature loss and the corrected ampere-hour integral.

2. The method for correcting the SOC of a lithium battery according to claim 1, wherein: Obtaining the battery capacity distribution of the lithium battery at different temperatures, including: Obtaining a first total charge amount discharged by the lithium battery when discharging at a first preset current at a first preset temperature; Determining a plurality of first adjacent temperatures of the first preset temperature according to a first preset temperature interval; Discharging at the plurality of first adjacent temperatures according to the first preset current, thereby obtaining a plurality of adjacent total charges; The battery capacity distribution is determined according to the first total charge amount and the plurality of adjacent total charge amounts.

3. The method for correcting the SOC of a lithium battery according to claim 1, wherein: Obtaining the DC internal resistance distribution of the lithium battery at different temperatures, including: Obtaining a first internal resistance value of the direct current internal resistance of the lithium battery at a second preset temperature when a second preset current flows through the battery; determining a plurality of second adjacent temperatures of the second preset temperature according to a second preset temperature interval; determining a plurality of adjacent currents of the second preset current according to a preset current spacing; Determining, according to the plurality of second adjacent temperatures and the plurality of adjacent currents, a plurality of internal resistance values ​​of the lithium battery at different adjacent temperatures and when different adjacent currents flow therethrough; The DC internal resistance distribution is determined according to the first internal resistance value and the multiple internal resistance values.

4. The method for correcting the SOC of a lithium battery according to claim 1, wherein: Determining the temperature loss of the lithium battery according to the battery capacity distribution, the initial battery temperature, the current battery temperature, and the initial available charge ratio includes: determining an initial temperature coefficient and a current temperature coefficient of the lithium battery according to the battery capacity distribution, the initial battery temperature, and the current battery temperature; The temperature loss is determined according to the initial temperature coefficient, the current temperature coefficient and the initial available charge ratio and a temperature loss calculation formula.

5. The method for correcting the SOC of a lithium battery according to claim 4, characterized in that: Determining an initial temperature coefficient and a current temperature coefficient of the lithium battery according to the battery capacity distribution, the initial battery temperature, and the current battery temperature, respectively, includes: determining, according to the battery capacity distribution, the initial battery temperature, and the current battery temperature, an initial battery capacity corresponding to the initial battery temperature and a current battery capacity corresponding to the current battery temperature; The initial temperature coefficient and the current temperature coefficient are determined respectively according to the initial battery capacity, the current battery capacity and a temperature coefficient conversion formula.

6. The method for correcting the SOC of a lithium battery according to claim 1, wherein: Determining a corrected ampere-hour integral of the lithium battery according to the battery capacity distribution, the DC internal resistance distribution, the real-time battery temperature, the current battery temperature, the rated total charge, the remaining life ratio, the real-time current, the rated current, the rated voltage, and the remaining life ratio includes: determining a real-time discharge efficiency corresponding to the real-time current according to the DC internal resistance distribution, the real-time battery temperature, the real-time current, and the rated voltage; determining a rated discharge efficiency according to the DC internal resistance distribution, the real-time battery temperature, the rated current, and the rated voltage; Determining a real-time discharge rate coefficient of the lithium battery according to the real-time discharge efficiency and the rated discharge efficiency; determining a current temperature coefficient according to the battery capacity distribution and the current battery temperature; The corrected ampere-hour integral is determined according to the real-time discharge rate coefficient, the real-time current, the current temperature coefficient, the rated total charge, and the remaining life ratio.

7. The method for correcting the SOC displayed by the lithium battery discharge display according to claim 6, characterized in that: Determining a real-time discharge efficiency corresponding to the real-time current according to the DC internal resistance distribution, the real-time battery temperature, the real-time current, and the rated voltage includes: Determining the real-time DC internal resistance of the lithium battery according to the DC internal resistance distribution and the real-time battery temperature; The real-time discharge efficiency is determined according to the real-time DC internal resistance, the real-time current and the rated voltage using a discharge efficiency calculation formula.

8. A device for correcting the SOC displayed by a lithium battery discharge, characterized in that: include: A basic distribution data acquisition module is used to obtain the battery capacity distribution and DC internal resistance distribution of the lithium battery at different temperatures; A battery parameter acquisition module is used to obtain the real-time battery temperature, initial battery temperature, current battery temperature, initial available charge ratio, rated total charge, remaining life ratio, real-time current, rated current, rated voltage and remaining life ratio of the lithium battery; a temperature loss acquisition module, configured to determine the temperature loss of the lithium battery according to the battery capacity distribution, the initial battery temperature, the current battery temperature, and the initial available charge ratio; a modified ampere-hour integral acquisition module, configured to determine the modified ampere-hour integral of the lithium battery based on the battery capacity distribution, the DC internal resistance distribution, the real-time battery temperature, the current battery temperature, the rated total charge, the remaining life ratio, the real-time current, the rated current, the rated voltage, and the remaining life ratio; The discharge display correction module is used to correct the discharge display SOC of the lithium battery according to the temperature loss and the corrected ampere-hour integral.

9. An electronic device, characterized in that: The method comprises a processor and a memory, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the method for correcting the SOC displayed by the discharge of a lithium battery according to any one of claims 1 to 7 is implemented.

10. A storage medium, characterized in that: The storage medium stores computer program instructions, and when the computer program instructions are executed by a computer, the computer is caused to execute the method for correcting the lithium battery discharge display SOC according to any one of claims 1 to 7.

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