Method, device and equipment for obtaining soc of automobile storage battery and storage medium

Abstract

The application discloses a kind of SOC acquisition method, device and equipment of automobile battery and computer readable storage medium, belong to automobile battery management technical field.The method comprises: obtaining the SOC value and OCV value of multiple batteries, which are obtained by placing the battery in full power state in multiple temperature preset constant temperature environment for constant current discharge test;According to the SOC value and OCV value in multiple preset constant temperature environment, the SOC-OCV curve under multiple environment temperatures is fitted, including target SOC-OCV curve;According to the SOC-OCV curve under multiple environment temperatures and the first group of preset formula, the temperature variation coefficient is calculated;According to the current OCV value, current environment temperature, target SOC-OCV curve, temperature variation coefficient and second preset formula of the obtained battery, the SOC value of the current battery is obtained.The application considers the influence of temperature on OCV value, improves the accuracy of SOC estimation, and is suitable for accurate acquisition of automobile battery SOC under different temperature environment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery management, in particular to a SOC acquisition method, device and equipment of an automobile battery and a storage medium. BACKGROUND

[0002] With the popularity of electric vehicles, the charge and discharge management of the battery has become a key technology to ensure the performance of the vehicle and the service life of the battery. In the prior art, the charge control of the low-voltage battery mainly depends on the voltage threshold judgment or simple SOC estimation logic.

[0003] Referring to patent CN106004446A, intermittent charging of the battery is realized by dynamically adjusting the start and stop of the DC / DC converter. Although this method can improve the energy utilization rate, its core defect is that the state is directly judged by the corresponding relationship between the battery voltage and the SOC, and an accurate SOC-OCV fitting model is not established, which leads to misjudgment of the SOC state under complex working conditions (such as temperature change and battery aging).

[0004] To solve the above problems, a method is needed to accurately fit the relationship between SOC and OCV, combine a temperature compensation mechanism, realize high-precision estimation of the battery state, and effectively avoid overcharging / overdischarging risks, thereby improving the reliability and service life of the battery management system. SUMMARY

[0005] The present application provides a SOC acquisition method, device, equipment and computer readable storage medium against temperature drift, which can solve the technical problem that in the prior art, the state is directly judged by the corresponding relationship between the battery voltage and the SOC, and an accurate SOC-OCV fitting model is not established, which leads to misjudgment of the SOC state under complex working conditions (such as temperature change and battery aging).

[0006] In a first aspect, the present application provides a SOC acquisition method of an automobile battery, which comprises: obtaining the SOC values and OCV values of a plurality of batteries, wherein the SOC values and OCV values of the plurality of batteries are obtained by placing each fully charged battery in a plurality of preset constant temperature environments for constant current discharge testing; fitting the SOC-OCV curves under a plurality of environmental temperatures according to the plurality of SOC values and the plurality of OCV values in the plurality of preset constant temperature environments, wherein the SOC-OCV curves under the plurality of environmental temperatures include a target SOC-OCV curve; calculating a temperature variation coefficient according to the SOC-OCV curves under the plurality of environmental temperatures and a first set of preset formulas; The current SOC value of the battery is obtained based on the current OCV value of the battery, the current ambient temperature, the target SOC-OCV curve, the temperature change coefficient, and the second preset formula.

[0007] In conjunction with the first aspect, in one embodiment, calculating the temperature change coefficient based on the SOC-OCV curves under various ambient temperatures and a first set of preset formulas includes: Based on the SOC-OCV curves under various ambient temperatures, obtain multiple OCV values ​​corresponding to the target SOC value under different ambient temperatures; The target temperature change coefficient is calculated based on the various OCV values, preset ambient temperatures, and the first set of preset formulas.

[0008] In conjunction with the first aspect, in one embodiment, calculating the target temperature change coefficient based on each of the aforementioned OCV values, various preset ambient temperatures, and the first set of preset formulas includes: Based on the various OCV values, multiple preset ambient temperatures, and the first set of preset formulas, the temperature change coefficient corresponding to each of the preset ambient temperatures is calculated. The target temperature change coefficient is calculated based on the temperature change coefficients corresponding to the various preset ambient temperatures.

[0009] In conjunction with the first aspect, in one embodiment, obtaining the current SOC value of the battery based on the acquired current OCV value of the battery, the current ambient temperature, the target SOC-OCV curve, the temperature change coefficient, and the second preset formula includes: Obtain the current OCV value and current ambient temperature of the battery; Based on the current ambient temperature, the temperature change coefficient, and the second preset formula, the correction is calculated. The OCV value after that; Based on the corrected OCV value, query the target SOC-OCV curve to obtain the current energy storage. The SOC value of the pool.

[0010] In conjunction with the first aspect, in one embodiment, obtaining the SOC and OCV values ​​of the multiple batteries includes: After placing multiple fully charged storage batteries for a first preset time, the open-circuit voltage at this time is obtained as the initial OCV value. Discharge at the first preset current value, during which the OCV value corresponding to each SOC value is measured and recorded; When the discharge to the SOC value is detected as zero, the circuit of the battery is disconnected, and the open circuit voltage at this time is obtained as the OCV value when the SOC value is zero after a second preset time length.

[0011] In combination with the first aspect, in an implementation manner, the SOC-OCV curve under the plurality of environment temperatures is fitted according to the plurality of SOC values and the plurality of OCV values in the plurality of preset constant temperature environments of the plurality of temperatures. The plurality of SOC values and the plurality of OCV values in the plurality of preset constant temperature environments are curve-fitted to obtain the SOC-OCV curve under the plurality of environment temperatures, wherein the range of the environment temperature is -30-60 .

[0012] In combination with the first aspect, in an implementation manner, before the prepared plurality of fully charged storage batteries are placed in the preset constant temperature environment for the constant current discharge test, the method further comprises: performing a discharge function test and a starting function test on the storage battery; The discharge function test comprises: discharging the fully charged storage battery at a second preset current value for a second preset time length, and then, if it is detected that the SOC value of the current storage battery is greater than a first preset SOC value, it is determined that the storage battery can normally discharge. The starting function test comprises: placing the fully charged storage battery in a preset low temperature environment for a third preset time length, and then discharging at a third preset current value for a fourth preset time length, and then, if it is detected that the voltage value of the storage battery is greater than a first preset voltage value, it is determined that the storage battery can normally start in a low temperature environment. When the OCV value is lower than a second preset voltage value, discharging at a fourth preset current value until the OCV value is a third preset voltage value, and if it is detected that the discharging time length is greater than a fifth preset time length, it is determined that the storage battery can normally start in the case of a low OCV value, wherein the second preset voltage value is less than the first preset voltage value.

[0013] The second aspect provides a SOC acquisition device of an automobile storage battery. The test module is configured to obtain the SOC value and the OCV value of a plurality of storage batteries, wherein the SOC value and the OCV value of the plurality of storage batteries are obtained by placing each fully charged storage battery in a plurality of preset constant temperature environments of a plurality of temperatures for a constant current discharge test. a fitting module configured to fit an SOC-OCV curve at various ambient temperatures according to the plurality of SOC values and the plurality of OCV values in the preset constant temperature environment at various temperatures, wherein the SOC-OCV curve at various ambient temperatures comprises a target SOC-OCV curve; a calculating module configured to calculate a temperature variation coefficient according to the SOC-OCV curve at various ambient temperatures and a first preset formula; a obtaining module configured to obtain a SOC value of a current storage battery according to a current OCV value, a current ambient temperature, the target SOC-OCV curve, the temperature variation coefficient and a second preset formula.

[0014] In a third aspect, an SOC obtaining device for a vehicle storage battery is provided, which comprises a processor, a memory, and an SOC obtaining program for a vehicle storage battery stored in the memory and executable by the processor. When the SOC obtaining program for a vehicle storage battery is executed by the processor, the steps of the SOC obtaining method for a vehicle storage battery are implemented.

[0015] In a fourth aspect, a computer readable storage medium is provided, which stores an SOC obtaining program for a vehicle storage battery. When the SOC obtaining program for a vehicle storage battery is executed by a processor, the steps of the SOC obtaining method for a vehicle storage battery are implemented.

[0016] The technical scheme provided by the embodiments of the present application has the following beneficial effects: The OCV value and the SOC value are measured in a constant temperature environment to resist internal battery temperature drift and avoid curve distortion caused by temperature drift. A plurality of temperature test SOV-OCV curves are set to obtain a temperature variation coefficient. A judgment standard (dU / dt<10mV / hour) of open circuit voltage stability is specified in the discharge test to avoid inaccurate OCV measurement. According to the SOC threshold, overcharging and overdischarging of the storage battery can be avoided, thereby improving the performance and life of the storage battery. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 A flowchart of an embodiment of the SOC obtaining method for a vehicle storage battery according to the present application to resist temperature drift; Figure 2 A functional module diagram of an embodiment of the SOC obtaining device for a vehicle storage battery according to the present application to resist temperature drift; Figure 3A hardware structure diagram of the SOC acquisition device against temperature drift involved in the embodiment of the present application. DETAILED DESCRIPTION

[0018] In order for those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0019] In order to make the purpose, technical solutions and advantages of the present application clearer, the embodiments of the present application will be described in further detail below with reference to the drawings.

[0020] In a first aspect, the embodiments of the present application provide a SOC acquisition method against temperature drift.

[0021] In an embodiment, with reference to Figure 1 , Figure 1 A flowchart of the SOC acquisition method against temperature drift of the first embodiment of the present application is shown in FIG. 1. As shown in FIG. 1, the SOC acquisition method against temperature drift includes the following steps. Figure 1 Step S10: obtaining the SOC values and OCV values of a plurality of storage batteries, wherein the SOC values and OCV values of the plurality of storage batteries are obtained by placing each fully charged storage battery in a plurality of preset constant temperature environments for constant current discharge testing. For example, the open circuit voltage is first obtained as the initial OCV value. In actual operation, after the automotive storage battery is left for a period of time, the voltage across the storage battery is measured using a high-precision voltmeter, and recorded as the initial OCV value. Then, by controlling the discharge current, the SOC value of the storage battery is changed at a preset interval, for example, recorded once every 10%, and the OCV value corresponding to each SOC value is recorded. Finally, when the storage battery is completely discharged to an SOC value of zero, the OCV value at this time is recorded. In this method, the SOC values and OCV values of the plurality of storage batteries are obtained to ensure the accuracy and representativeness of the data.

[0022] Specifically, the obtaining of the SOC values and OCV values of the plurality of storage batteries includes: placing a plurality of fully charged storage batteries for a first preset time period, obtaining the open circuit voltage at this time as the initial OCV value; discharging at a first preset current value, and measuring and recording the OCV value corresponding to each SOC value during the discharging; when discharging to an SOC value of zero is detected, the circuit of the storage battery is disconnected, and after being left for a second preset time period, the open circuit voltage at this time is obtained as the OCV value when the SOC value is zero. ​

[0023] For example, ten different types of automobile batteries are selected, and the OCV values of these batteries at SOC values of 0%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, and 100% are measured at ten different temperature environments of -30°C, -20°C, -10°C, 0°C, 10°C, 20°C, 30°C, 40°C, 50°C, and 60°C. A high-precision voltmeter is used to ensure that the measurement accuracy is ±0.01 V. The various environmental temperatures are simulated by pre-setting a liquid bath or a pre-set environmental chamber to counteract the internal temperature drift of the battery. The liquid includes water, an aqueous ethylene glycol solution, and high-concentration salt water. In the liquid, the battery is arranged such that the top of the shell is located 5 to 25 mm above the liquid level. If multiple batteries are placed in the same liquid, the distance between the batteries and the distance between the battery and the pool wall must be at least 25 mm. The top of the battery must be kept clean during the entire test process.

[0024] Specifically, before the prepared multiple fully charged storage batteries are placed in a pre-set constant temperature environment for constant current discharge testing, the battery is also subjected to a discharge function test and a starting function test. The discharge function test includes: discharging the fully charged battery at a second pre-set current value for a second pre-set time period, and then determining that the battery can normally discharge if the detected SOC value of the battery is greater than a first pre-set SOC value. The starting function test includes: placing the fully charged battery in a pre-set low temperature environment for a third pre-set time period, and then discharging the battery at a third pre-set current value for a fourth pre-set time period, and then determining that the battery can normally start in a low temperature environment if the detected voltage value of the battery is greater than a first pre-set voltage value. When the OCV value is lower than a second pre-set voltage value, discharging at a fourth pre-set current value until the OCV value is a third pre-set voltage value, and if the detected discharging time period is greater than a fifth pre-set time period, it is determined that the battery can normally start under a low OCV value, wherein the second pre-set voltage value is less than the first pre-set voltage value.

[0025] For example, the discharge function test is first performed. The discharge performance of the battery is tested at different SOC values, and the discharge current, discharge time, and voltage change curve are recorded. Then the starting function test is performed. The starting performance of the battery is tested at different SOC values and different environmental temperatures, and the starting current, starting time, and voltage drop are recorded. Finally, the ability of the battery to normally start under a low OCV value is detected. A plurality of low OCV value points are set, for example, OCV values corresponding to SOC values of 20%, 15%, 10%, and 5%, and whether the battery can normally start the engine at these OCV values is tested.

[0026] In a preferred embodiment, when obtaining the SOC value and the OCV value, a constant current discharge mode is adopted, the discharge current is controlled between 0.1C and 0.2C, and the OCV value is recorded every 5% SOC to improve data accuracy.

[0027] In another preferred embodiment, when fitting the SOC-OCV curve, a 5th order polynomial fitting method is adopted, the fitting accuracy can reach more than 99.5%, and the relationship between the SOC value and the OCV value can be more accurately reflected.

[0028] In yet another preferred embodiment, when calculating the temperature change coefficient, the SOC values of 30%, 50% and 70% are selected, the temperature change coefficients are calculated respectively, and then a more accurate temperature change coefficient is obtained according to the current SOC value through interpolation method.

[0029] Step S20: fitting the SOC-OCV curve under a plurality of environmental temperatures according to a plurality of SOC values and a plurality of OCV values in a plurality of preset constant temperature environments, wherein the SOC-OCV curve under the plurality of environmental temperatures includes a target SOC-OCV curve; Exemplarily, the SOC-OCV curve is obtained by curve fitting using the SOC value and OCV value data points obtained in step S10. The fitting process adopts a polynomial fitting method, and the fitting accuracy is not less than 99%. In the method, the environmental temperature range is -30~60℃, and in this temperature range, tests are respectively performed at -30℃, -20℃, -10℃, 0℃, 10℃, 20℃, 30℃, 40℃, 50℃ and 60℃, etc. temperature points, and the SOC-OCV curve under different temperatures is obtained.

[0030] Specifically, fitting the SOC-OCV curve under a plurality of environmental temperatures according to a plurality of SOC values and a plurality of OCV values in a plurality of temperature preset constant temperature environments includes: curve fitting a plurality of SOC values and a plurality of OCV values in a plurality of preset constant temperature environments to obtain a plurality of environmental temperature SOC-OCV curves, wherein the range of the environmental temperature is -30~60 .

[0031] Exemplarily, the data obtained by step S10 is used to perform curve fitting for each temperature point respectively, to obtain 10 SOC-OCV curves at different ambient temperatures. The fitting adopts a cubic polynomial equation: OCV = a x SOC³ + b x SOC² + c x SOC + d, wherein a, b, c, and d are fitting coefficients. The correlation coefficient R² of the fitted curve is greater than 0.995, indicating that the fitting accuracy is high. In a preferred embodiment, the fitting equation at an ambient temperature of 20°C is: OCV = 0.0003 x SOC³ - 0.0052 x SOC² + 0.0421 x SOC + 11.89.

[0032] Step S30: calculating a temperature change coefficient according to the SOC-OCV curves at a plurality of ambient temperatures and the first group of preset formulas; Exemplarily, the OCV values of the same SOC value at different ambient temperatures are obtained. For example, when the SOC value is 50%, the OCV values at temperatures of -30°C, -20°C, -10°C, 0°C, 10°C, 20°C, 30°C, 40°C, 50°C, and 60°C are recorded. By analyzing these data, the change coefficients of various temperatures are calculated. The temperature change coefficient represents the sensitivity of the OCV value to temperature change, with a unit of mV / °C.

[0033] Specifically, the calculation of the target temperature change coefficient according to the OCV values, the various preset ambient temperatures, and the first group of preset formulas includes: calculating the temperature change coefficients corresponding to the various preset ambient temperatures according to the OCV values, the various preset ambient temperatures, and the first group of preset formulas; and calculating the target temperature change coefficient according to the temperature change coefficients corresponding to the various preset ambient temperatures.

[0034] Exemplarily, the temperature change coefficients corresponding to the various preset ambient temperatures are calculated according to the OCV values, the various preset ambient temperatures, and the first group of preset formulas, wherein the first group of preset formulas includes: d1 = [OCV(25°C) - OCV(T1°C)] / (T1-25), d2 = [OCV(25°C) - OCV(T2°C)] / (T2-25) …… dx = [OCV(25°C) - OCV(Tx°C)] / (Tx-25), wherein d1, d2, ……, and dx are the temperature change coefficients at T1°C, T2°C, ……, and TX°C, OCV(25°C) (the OCV value at the standard temperature) is the OCV value at 25°C, OCV(T1°C) is the OCV value at T1°C, and other similar values are calculated in the same way. Then d = (d1 + d2 + …… + dx) / x, wherein d is the target temperature change coefficient.

[0035] Step S40: obtaining the SOC value of the current storage battery according to the obtained current OCV value of the storage battery, the current ambient temperature, the target SOC-OCV curve, the temperature variation coefficient and a second preset formula.

[0036] For example, when the measured OCV value is 12.45V and the ambient temperature is 15℃, the OCV value is first corrected to the standard condition of 25℃, and then the current SOC value is obtained by querying the SOC-OCV curve under the condition of 25℃.

[0037] Specifically, the method of obtaining the SOC value of the current storage battery according to the obtained current OCV value of the storage battery, the current ambient temperature, the target SOC-OCV curve, the temperature variation coefficient and a second preset formula comprises: obtaining the current OCV value of the storage battery and the current ambient temperature; calculating the corrected OCV value according to the current ambient temperature, the temperature variation coefficient and a second preset formula; and querying the target SOC-OCV curve according to the corrected OCV value to obtain the SOC value of the current storage battery.

[0038] For example, when the measured OCV value is 12.45V and the ambient temperature is 15℃, the OCV value is first corrected to the standard condition of 25℃, and then the current SOC value is obtained by querying the SOC-OCV curve under the condition of 25℃.

[0039] In this embodiment, the SOC value of the storage battery of the automobile can be accurately obtained by the above method, which provides reliable data support for the battery management system of the automobile and effectively improves the use efficiency of the battery and prolongs the service life of the battery. The method takes into account the influence of the ambient temperature on the OCV value, corrects the OCV value through the temperature variation coefficient, and greatly improves the accuracy of the estimation of the SOC value, especially the estimation accuracy under extreme temperature environment.

[0040] In a second aspect, the embodiments of the present application also provide a SOC obtaining device for resisting temperature drift.

[0041] In one embodiment, the SOC obtaining device for resisting temperature drift comprises Figure 2 , Figure 2Fig. 1 is a schematic diagram of functional modules of an embodiment of the SOC acquisition device against temperature drift according to the present application. As shown in Fig. 1, the SOC acquisition device against temperature drift comprises: Figure 2 a test module 01 configured to acquire SOC values and OCV values of a plurality of batteries, wherein the SOC values and OCV values of the plurality of batteries are obtained by placing each battery at full charge in a plurality of preset constant temperature environments at different temperatures and performing constant current discharge tests; a fitting module 02 configured to fit a plurality of SOC-OCV curves at different environmental temperatures according to the plurality of SOC values and OCV values in the plurality of preset constant temperature environments at different temperatures, wherein the plurality of SOC-OCV curves at different environmental temperatures include a target SOC-OCV curve; a calculation module 03 configured to calculate a temperature variation coefficient according to the plurality of SOC-OCV curves at different environmental temperatures and a first set of preset formulas; and an acquisition module 04 configured to acquire a SOC value of a battery according to a current OCV value of the battery, a current environmental temperature, the target SOC-OCV curve, the temperature variation coefficient, and a second preset formula.

[0042] Further, in an embodiment, the calculation module 03 is further configured to: acquire a plurality of OCV values corresponding to a target SOC value at different environmental temperatures according to the plurality of SOC-OCV curves at different environmental temperatures; calculate a target temperature variation coefficient according to each OCV value, each preset environmental temperature, and the first set of preset formulas.

[0043] Further, in an embodiment, the calculation module 03 is further configured to: calculate a temperature variation coefficient corresponding to each preset environmental temperature according to each OCV value, the plurality of preset environmental temperatures, and the first set of preset formulas; calculate the target temperature variation coefficient according to the temperature variation coefficients corresponding to the plurality of preset environmental temperatures.

[0044] Further, in an embodiment, the acquisition module 04 is further configured to: acquire a current OCV value of a battery and a current environmental temperature; calculate a corrected OCV value according to the current environmental temperature, the temperature variation coefficient, and the second preset formula; query the target SOC-OCV curve according to the corrected OCV value to acquire a SOC value of the battery. ​​​

[0045] Further, in an embodiment, the test module 01 is further configured to: place the plurality of fully charged storage batteries for a first preset time period, and obtain the open circuit voltage at this time as an initial OCV value; discharge at a first preset current value, and measure and record the OCV values corresponding to each SOC value during the discharging; when it is detected that the discharging reaches an SOC value of zero, disconnect the circuit of the storage battery, and after standing for a second preset time period, obtain the open circuit voltage at this time as the OCV value when the SOC value is zero.

[0046] Further, in an embodiment, the fitting module 02 is further configured to: fit the plurality of SOC values and the plurality of OCV values in a plurality of preset constant temperature environments to obtain SOC-OCV curves under a plurality of environmental temperatures, wherein the range of the environmental temperature is -30~60 .

[0047] Further, in an embodiment, the test module 01 is further configured to: perform a discharging function test and a starting function test on the storage battery; the discharging function test comprises: discharging the fully charged storage battery at a second preset current value for a second preset time period, and then, if it is detected that the SOC value of the current storage battery is greater than a first preset SOC value, it is determined that the storage battery can normally discharge; the starting function test comprises: placing the fully charged storage battery in a preset low temperature environment for a third preset time period, and then discharging at a third preset current value for a fourth preset time period, and then, if it is detected that the voltage value of the storage battery is greater than a first preset voltage value, it is determined that the storage battery can normally start in a low temperature environment; when the OCV value is lower than a second preset voltage value, discharging at a fourth preset current value until the OCV value is a third preset voltage value, and if it is detected that the discharging time period is greater than a fifth preset time period, it is determined that the storage battery can normally start in a low OCV value condition, wherein the second preset voltage value is less than the first preset voltage value.

[0048] The functions of each module in the above SOC acquisition device against temperature drift correspond to the steps in the above SOC acquisition method embodiment against temperature drift, and the functions and implementation processes will not be repeated here.

[0049] In a third aspect, the embodiments of the present application provide a SOC acquisition device against temperature drift. The SOC acquisition device against temperature drift can be a personal computer (PC), a notebook computer, a server, or other devices with data processing functions.

[0050] Refer to Figure 3 , Figure 3 Figure 1 is a schematic diagram of a hardware structure of a SOC acquisition device against temperature drift according to an embodiment of the present application. In the embodiment of the present application, the SOC acquisition device against temperature drift can include a processor, a memory, a communication interface, and a communication bus.

[0051] The communication bus can be of any type, used to interconnect the processor, the memory, and the communication interface.

[0052] The communication interface includes an input / output (I / O) interface, a physical interface, and a logical interface, etc. used to implement the interconnection of devices inside the SOC acquisition device against temperature drift, and an interface used to implement the interconnection of the SOC acquisition device against temperature drift and other devices (such as other computing devices or user devices). The physical interface can be an Ethernet interface, a fiber interface, an ATM interface, etc.; the user device can be a display (Display), a keyboard (Keyboard), etc.

[0053] The memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0054] The processor can be a general-purpose processor, which can invoke the SOC acquisition program against temperature drift stored in the memory and execute the SOC acquisition method against temperature drift provided by the embodiment of the present application. For example, the general-purpose processor can be a central processing unit (CPU). The method executed by the SOC acquisition program against temperature drift when invoked can refer to each embodiment of the SOC acquisition method against temperature drift of the present application, which will not be described here.

[0055] Those skilled in the art can understand that Figure 3 The hardware structure shown in the above figure does not constitute a limitation on the present application, and can include more or fewer components than the figure, or combine certain components, or different component arrangements.

[0056] In a fourth aspect, the embodiments of the present application further provide a computer readable storage medium.

[0057] The computer readable storage medium of the present application stores a temperature drift resisting SOC obtaining program, wherein the temperature drift resisting SOC obtaining program, when executed by a processor, implements the steps of the temperature drift resisting SOC obtaining method as described above.

[0058] The method implemented when the temperature drift resisting SOC obtaining program is executed can refer to the embodiments of the temperature drift resisting SOC obtaining method of the present application, which will not be repeated here.

[0059] It should be noted that the serial numbers of the embodiments of the present application are only for description, and do not represent the advantages or disadvantages of the embodiments.

[0060] The terms "comprising" and "having" and any variations thereof in the specification and claims of the present application and the above drawings are intended to cover not exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but can optionally include steps or units not listed, or can optionally include other steps or units inherent to the process, method, product or device. The terms "first", "second" and "third" and the like descriptions are used to distinguish different objects, and do not represent the order or limit the types of "first", "second" and "third".

[0061] In the description of the embodiments of the present application, "exemplary", "for example" or "for instance" is used to represent an example, illustration or description. Any embodiment or design scheme described as "exemplary", "for example" or "for instance" in the embodiments of the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. In fact, the words "exemplary", "for example" or "for instance" are intended to present the relevant concept in a specific way.

[0062] In the description of the embodiments of the present application, unless otherwise specified, " / " represents or, for example, A / B can represent A or B; "and / or" in the text only describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent three cases of A alone, A and B together, and B alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0063] In some of the processes described in this specification, the order of operations or steps can be modified. Specifically, the serial order of any two consecutive steps carried out according to the processes described in this specification can be changed so that these two steps can be carried out in parallel or simultaneously, or the order of these two steps can be reversed.

[0064] Those skilled in the art can clearly understand the above-mentioned embodiment method from the description of the above embodiments, which can be realized by software and a necessary general hardware platform, of course, it can also be realized by hardware, but in many cases, the former is a better embodiment. Based on this understanding, the technical solutions of the present application can be embodied in the form of a software product, which is stored in a storage medium (such as a ROM / RAM, a magnetic disk, or an optical disc) and includes a plurality of instructions for causing a terminal device to execute the methods described in the various embodiments of the present application.

[0065] The above is only the preferred embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation using the content of the specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A method of acquiring an SOC of an automotive storage battery, characterized by, The SOC acquisition method of the automobile storage battery comprises: obtaining the SOC values and OCV values of a plurality of storage batteries, wherein the SOC values and OCV values of the plurality of storage batteries are obtained by placing each full-charge storage battery in a plurality of preset constant temperature environments for constant current discharge testing; fitting out SOC-OCV curves under a plurality of environmental temperatures according to the plurality of SOC values and the plurality of OCV values in the plurality of preset constant temperature environments, wherein the SOC-OCV curves under the plurality of environmental temperatures include a target SOC-OCV curve; calculating a temperature variation coefficient according to the SOC-OCV curves under the plurality of environmental temperatures and a first set of preset formulas; obtaining the SOC value of the current storage battery according to the obtained current OCV value of the storage battery, the current environmental temperature, the target SOC-OCV curve, the temperature variation coefficient and a second preset formula.

2. The method for obtaining the State of Charge (SOC) of an automotive battery as described in claim 1, characterized in that, The calculation of the temperature variation coefficient according to the SOC-OCV curves under the plurality of environmental temperatures and the first set of preset formulas comprises: obtaining a plurality of OCV values corresponding to the target SOC value under different environmental temperatures according to the SOC-OCV curves under a plurality of environmental temperatures; calculating a target temperature variation coefficient according to each OCV value, each preset environmental temperature and the first set of preset formulas.

3. The method of claim 2, wherein the SOC of the automotive storage battery is calculated by the following equation: ###0001### wherein, A is a constant, and B is a constant. The calculation of the target temperature variation coefficient according to each OCV value, each preset environmental temperature and the first set of preset formulas comprises: calculating temperature variation coefficients corresponding to each preset environmental temperature according to each OCV value, a plurality of preset environmental temperatures and the first set of preset formulas; calculating a target temperature variation coefficient according to the temperature variation coefficients corresponding to each preset environmental temperature.

4. The method of claim 1, wherein the SOC of the automotive storage battery is obtained by the following equation: ###0001### wherein, A is a constant, and B is a constant. The obtaining of the SOC value of the current storage battery according to the obtained current OCV value of the storage battery, the current environmental temperature, the target SOC-OCV curve, the temperature variation coefficient and the second preset formula comprises: obtaining the current OCV value of the storage battery and the current environmental temperature; calculating a corrected OCV value according to the current environmental temperature, the temperature variation coefficient and the second preset formula; obtaining the SOC value of the current storage battery by querying the target SOC-OCV curve according to the corrected OCV value. The obtaining of the SOC values and OCV values of a plurality of storage batteries comprises: placing a plurality of fully charged storage batteries for a first preset time period, and obtaining the open circuit voltage at this time as an initial OCV value; 5. The method of claim 1, wherein the SOC of the automotive storage battery is obtained by the following equation: ###0001### where, A is a constant, and B is a constant. discharging at a first preset current value, and measuring and recording the OCV values corresponding to each SOC value during the discharging; when discharging to an SOC value of zero is detected, disconnecting the circuit of the storage battery, and obtaining the open circuit voltage at this time as the OCV value when the SOC value is zero after standing for a second preset time period. The fitting out of the SOC-OCV curves under a plurality of environmental temperatures according to the plurality of SOC values and the plurality of OCV values in the plurality of preset constant temperature environments of different temperatures comprises: ​ ​ 6. The method of claim 1, wherein the SOC of the automotive storage battery is obtained by the following equation: ###0001### wherein, A is a constant, and B is a constant. ​ The SOC-OCV curves under various environment temperatures are obtained by curve fitting of the plurality of SOC values and the plurality of OCV values in the plurality of preset constant temperature environments, wherein the range of the environment temperature is -30~60 .

7. The method of claim 1, wherein the SOC of the automotive storage battery is obtained by the following equation: ###00001### wherein, A is a constant, and B is a constant. The prepared multiple full-charged storage batteries are placed in a preset constant temperature environment for constant current discharge test before the step of placing the prepared multiple full-charged storage batteries in a preset constant temperature environment for constant current discharge test. The storage battery is subjected to discharge function test and starting function test. The discharge function test comprises: discharging the full-charged storage battery at a second preset current value for a second preset time length, and then determining that the storage battery can normally discharge if it is detected that the SOC value of the current storage battery is greater than a first preset SOC value. The starting function test comprises: placing the full-charged storage battery in a preset low temperature environment for a third preset time length, and then discharging the full-charged storage battery at a third preset current value for a fourth preset time length, and then determining that the storage battery can normally start in a low temperature environment if it is detected that the voltage value of the storage battery is greater than a first preset voltage value. In the case that the OCV value is lower than a second preset voltage value, the storage battery is discharged at a fourth preset current value until the OCV value is a third preset voltage value, and if it is detected that the discharging time length is greater than a fifth preset time length, it is determined that the storage battery can normally start in the case of low OCV value, wherein the second preset voltage value is less than the first preset voltage value.

8. A device for obtaining the State of Charge (SOC) of an automotive battery, characterized in that, The SOC acquisition device of the automobile storage battery comprises: The test module is configured to acquire the SOC values and OCV values of the multiple storage batteries, wherein the SOC values and OCV values of the multiple storage batteries are acquired by placing each full-charged storage battery in a preset constant temperature environment of multiple temperatures for constant current discharge test. The fitting module is configured to fit the SOC-OCV curves under multiple environmental temperatures according to the multiple SOC values and multiple OCV values in the preset constant temperature environments of multiple temperatures, wherein the SOC-OCV curves under multiple environmental temperatures comprise a target SOC-OCV curve. The calculation module is configured to calculate a temperature variation coefficient according to the SOC-OCV curves under multiple environmental temperatures and a first set of preset formulas. The acquisition module is configured to acquire the SOC value of the current storage battery according to the acquired current OCV value of the storage battery, current environmental temperature, the target SOC-OCV curve, the temperature variation coefficient, and a second preset formula.

9. An SOC acquisition device for an automotive storage battery, characterized by comprising: The SOC acquisition device of the automobile storage battery comprises a processor, a memory, and a SOC acquisition program of the automobile storage battery stored on the memory and executable by the processor, wherein the SOC acquisition program of the automobile storage battery is executed by the processor to implement the steps of the SOC acquisition method of the automobile storage battery according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The SOC acquisition program of the automobile storage battery is stored on the computer readable storage medium, wherein the SOC acquisition program of the automobile storage battery is executed by the processor to implement the steps of the SOC acquisition method of the automobile storage battery according to any one of claims 1 to 7.

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