A method, system and electronic device for calculating low temperature energy retention rate of power battery

Abstract

The present invention discloses a method, system, and electronic device for calculating the low-temperature energy retention rate of a power battery, which simulates and obtains a relationship curve between time and battery charge and discharge current; obtains the energy loss value E1 converted into heat according to the time integral, and determines the upper and lower limits of the power battery SOC; calculates the proportion of the SOC value that cannot be released in the total available SOC range; calculates the energy E2 that cannot be released and loses, and calculates the total energy lost under low-temperature automobile driving conditions; and calculates the low-temperature energy retention rate of the power battery. The present invention solves the problem that there is no method for calculating the low-temperature energy retention rate of a power battery in the current industry. The low-temperature energy retention rate of a power battery can be calculated in the conceptual design stage, and the scheme can be optimized in a timely manner. The achievable low-temperature energy retention rate of the power battery can be calculated in advance, without having to wait for the power battery to be manufactured and then test the low-temperature energy retention rate of the battery.

Description

Technical Field

[0001] The present invention relates to a method, system and electronic device for calculating low-temperature energy retention rate, and in particular to a method, system and electronic device for calculating low-temperature energy retention rate of a power battery. Background Art

[0002] The power battery of new energy pure electric vehicles is the only power source for the entire vehicle. Affected by the electrochemical characteristics of the battery itself, the available energy of the power battery is reduced under low temperature conditions, resulting in a shortened vehicle range. This issue is one of the core complaints of the market.

[0003] In order to solve the industry problem of reduced available energy of power batteries under low temperature conditions, all companies have proposed development goals to improve low-temperature energy retention rates. The current problem is that the industry has no method to calculate the low-temperature energy retention rate of power batteries. The low-temperature energy retention rate can only be tested after the power batteries are actually manufactured, which affects the development cycle and increases development costs. Summary of the invention

[0004] The purpose of the present invention is to provide a low-temperature energy retention rate calculation method, system, and electronic equipment. First, the problem of the current industry's lack of a method for calculating the low-temperature energy retention rate of a power battery is solved. The low-temperature energy retention rate of a power battery can be calculated in the conceptual design stage to confirm in advance whether the development goal has been achieved, so that the solution can be optimized in a timely manner. The second technical problem to be solved by the present invention is to combine actual CLTC and other operating conditions to calculate the parameters of transient operating conditions such as process power, current, and DC internal resistance, so that the calculation results are more accurate and closer to the actual measured results.

[0005] The present invention provides the following scheme:

[0006] A method for calculating low temperature energy retention rate of a power battery, specifically comprising:

[0007] According to the vehicle driving conditions and battery charging and discharging power, the relationship curve between time and battery charging and discharging current is obtained through simulation;

[0008] Determine the DC internal resistance DCR of the power battery cell, the total duration of the vehicle driving cycle, the number of power batteries in series and parallel, and the SOC at the end of the operating condition end value;

[0009] The energy loss value E1 converted into heat is obtained according to the time integral, and the upper and lower limits of the power battery SOC are determined;

[0010] Calculate the SOC value that cannot be released and the proportion of the SOC value that cannot be released to the total available SOC range;

[0011] Multiply the total available energy E of the power battery at room temperature by the ratio of the SOC value that cannot be discharged to the total available SOC range to calculate the energy lost due to failure to discharge E2;

[0012] Add the energy loss converted into heat and the energy lost that cannot be released to get the total energy loss E under low temperature vehicle driving conditions. loss ;

[0013] Calculate the low-temperature energy retention rate of the power battery, specifically: low-temperature energy retention rate of the power battery = (total available energy of the power battery at room temperature E-total energy loss under low-temperature vehicle driving conditions E loss ) / Total available energy E of the power battery at room temperature.

[0014] Furthermore, according to the vehicle driving condition and the battery charging and discharging power, the relationship curve between time and battery charging and discharging current is simulated, specifically:

[0015] Perform simulation analysis based on the vehicle driving conditions to obtain the relationship curve between time and battery charging and discharging power;

[0016] According to the relationship curve between time and battery charge and discharge power, the relationship curve between time and battery charge and discharge current is obtained by simulation.

[0017] Furthermore, the determination of the DC internal resistance of the power battery cell, the total duration of the vehicle driving cycle, the number of power batteries connected in series and parallel, and the SOC at the end of the operating condition end Values, specifically:

[0018] Confirm the relationship map between the DC internal resistance DCR of the power battery cell and the power battery state of charge SOC and battery temperature T;

[0019] Confirm the low temperature starting temperature T to be calculated 起始 The simulation results show that the total duration of the CLTC cycle that can be completed at the low temperature starting temperature is t total And SOC at the end of the working condition end value;

[0020] Confirm the number of power batteries in series and parallel, mPnS.

[0021] Furthermore, the energy loss value converted into heat is added to the energy lost that cannot be released to obtain the total energy lost under low-temperature vehicle driving conditions, specifically:

[0022] Power battery charge and discharge current I, power battery DC internal resistance DCR and the total duration of the CLTC cycle that can be completed t total , the energy loss value E1 converted into heat is calculated by time integration, and the energy loss value E1 satisfies the following formula:

[0023]

[0024] Furthermore, the calculation of the SOC value that cannot be released and the proportion of the SOC value that cannot be released to the total available SOC range are specifically:

[0025] Confirm the power battery SOC usage upper limit SOC upper and use lower limit SOC lower ;

[0026] According to the SOC at the end of the working condition end value, calculate the SOC that cannot be released retain , satisfying the following formula: SOC that cannot be released retain = SOC at the end of the working condition end Value - Use lower limit SOC lower ;

[0027] Calculate the SOC that cannot be released retain The proportion μ of the total available SOC interval satisfies the following formula: retain The proportion of the total available SOC range μ = the SOC that cannot be released retain /

[0028] (SOC upper -SOC lower ).

[0029] Further, the total available energy E of the power battery at room temperature is confirmed;

[0030] Based on the SOC that could not be released retain The proportion μ of the total available SOC range is used to calculate the energy E2 that cannot be released and is lost, which satisfies the formula: Energy E2 = μ*total available energy E of the power battery at room temperature.

[0031] Furthermore, the energy loss value E1 and the energy that cannot be released E2, the total energy loss E under low temperature CLTC conditions loss , satisfying the formula: E loss =E1+E2;

[0032] Based on the total available energy E of the power battery at room temperature and the total energy lost under low temperature CLTC conditions E loss , the low temperature energy retention rate η is calculated, which satisfies the formula: low temperature energy retention rate η=(EE loss ) / E.

[0033] A power battery low temperature energy retention rate calculation system, specifically comprising:

[0034] The module of relationship between time and battery charge and discharge current is used to simulate the relationship curve between time and battery charge and discharge current according to the vehicle driving conditions and battery charge and discharge power;

[0035] Energy loss value calculation module, determines the DC internal resistance DCR of the power battery cell, the total duration of the vehicle driving cycle, the number of power batteries in series and parallel, and the SOC at the end of the operating condition end value;

[0036] The energy loss value E1 converted into heat is obtained according to the time integral, and the upper and lower limits of the power battery SOC are determined;

[0037] A module for calculating the ratio of the SOC value that cannot be released to the total available SOC interval, used to calculate the SOC value that cannot be released and the ratio of the SOC value that cannot be released to the total available SOC interval;

[0038] The energy calculation module that cannot be discharged multiplies the total available energy E of the power battery at room temperature by the ratio of the SOC value that cannot be discharged to the total available SOC range, and calculates the energy E2 that cannot be discharged;

[0039] The total energy loss calculation module under low-temperature vehicle driving conditions is used to add the energy loss value converted into heat and the energy lost that cannot be released to calculate the total energy loss E under low-temperature vehicle driving conditions. loss ;

[0040] The power battery low temperature energy retention rate calculation module calculates the power battery low temperature energy retention rate, specifically: power battery low temperature energy retention rate = (power battery total available energy at room temperature E-total energy loss under low temperature vehicle driving conditions E loss ) / total available energy E of the power battery at room temperature.

[0041] An electronic device comprises: a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other via the communication bus; a computer program is stored in the memory, and when the computer program is executed by the processor, the processor executes the steps of the method.

[0042] A computer-readable storage medium stores a computer program executable by an electronic device. When the computer program runs on the electronic device, the electronic device executes the steps of the method.

[0043] Compared with the prior art, the present invention has the following advantages:

[0044] Compared with the existing technology, the invention provides a method for calculating the low-temperature energy retention rate of a power battery for the first time, which solves the problem that there is no method for calculating the low-temperature energy retention rate of a power battery in the industry. The low-temperature energy retention rate of the power battery can be calculated in the conceptual design stage to confirm in advance whether the development goal has been achieved, so as to optimize the plan in time. The achievable low-temperature energy retention rate of the power battery can be calculated in advance, which can shorten the development cycle and save development costs. There is no need to wait for the actual power battery to be manufactured before testing the low-temperature energy retention rate of the actual battery.

[0045] The present invention combines actual CLTC and other working conditions, and the power, current, DC internal resistance and other parameters in the calculation process all adopt transient working conditions, which is consistent with the subsequent actual test scheme, so that the calculation results are more accurate and closer to the actual measured results. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0047] Figure 1 It is a flow chart of the method for calculating the low-temperature energy retention rate of a power battery.

[0048] Figure 2 This is the architecture diagram of the power battery low-temperature energy retention rate calculation system.

[0049] Figure 3 It is a curve diagram of the relationship between time t and battery charging and discharging power p obtained through simulation analysis based on CLTC working conditions.

[0050] Figure 4 It is a curve diagram of the relationship between time t and battery charge and discharge current I obtained by simulation.

[0051] Figure 5 It is a schematic diagram for calculating the low-temperature energy retention rate of power batteries.

[0052] Figure 6 It is a flow chart for calculating the low temperature energy retention rate of a power battery according to an embodiment of the present invention.

[0053] Figure 7 It is a structural diagram of an electronic device. DETAILED DESCRIPTION

[0054] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0055] like Figure 1 The method for calculating the low temperature energy retention rate of the power battery shown in the figure specifically includes:

[0056] Step T1, according to the vehicle driving condition and the battery charging and discharging power, simulate and obtain the relationship curve between time and battery charging and discharging current;

[0057] Specifically, simulation analysis is performed according to the vehicle driving conditions to obtain a relationship curve between time and battery charging and discharging power;

[0058] According to the relationship curve between time and battery charge and discharge power, the relationship curve between time and battery charge and discharge current is obtained by simulation;

[0059] Step T2, determine the DC internal resistance DCR of the power battery cell, the total duration of the vehicle driving cycle, the number of power batteries connected in series and parallel, and the SOC at the end of the driving cycle. end value;

[0060] Specifically, confirm the relationship map between the DC internal resistance DCR of the power battery cell and the power battery state of charge SOC and battery temperature T;

[0061] Confirm the low temperature starting temperature T to be calculated 起始 The simulation results show that the total duration of the CLTC cycle that can be completed at the low temperature starting temperature is t total And SOC at the end of the working condition end Value; Exemplarily, in the embodiment of the present invention, T 起始 =-20℃, t obtained by simulation total =25020s, SOC end =10.8%.

[0062] Confirm the number of power batteries connected in series and in parallel, mPnS; illustratively, in the embodiment of the present invention, m is 2 and n is 108, that is, the number of power batteries connected in series and in parallel is 2P108S.

[0063] Step T3, obtaining the energy loss value E1 converted into heat according to the time integral, and determining the upper limit and lower limit of the power battery SOC;

[0064] Specifically, the power battery charge and discharge current I, the power battery DC internal resistance DCR and the total duration of the CLTC cycle that can be completed t total, the energy loss value E1 converted into heat is calculated by time integration, and the energy loss value E1 satisfies the following formula:

[0065]

[0066] Exemplarily, in the embodiment of the present invention, it is calculated that E1=2.1 kWh.

[0067] Step T4, calculating the SOC value that cannot be released and the ratio of the SOC value that cannot be released to the total available SOC range;

[0068] Specifically, confirm the power battery SOC usage upper limit SOC upper and use lower limit SOC lower ;

[0069] For example, in the embodiment of the present invention, SOC upper =97%, SOC lower =3%.

[0070] According to the SOC at the end of the working condition end value, calculate the SOC that cannot be released retain , satisfying the following formula: SOC that cannot be released retain = SOC at the end of the working condition end Value - Use lower limit SOC lower , that is: SOC retain =SOC end -SOC lower ;

[0071] For example, in the embodiment of the present invention, SOC retain =SOC end -SOC lower =10.8%-3%=7.8%;

[0072] Calculate the SOC that cannot be released retain The proportion μ of the total available SOC interval satisfies the following formula: retain The proportion of the total available SOC range μ = the SOC that cannot be released retain /

[0073] (SOC upper -SOC lower );

[0074] Exemplarily, μ=7.8% / (97%-3%)=8.3%.

[0075] Step T5, multiplying the total available energy E of the power battery at room temperature by the ratio of the SOC value that cannot be discharged to the total available SOC range, and calculating the energy E2 that cannot be discharged;

[0076] Step T6, add the energy loss value converted into heat and the energy lost that cannot be released to obtain the total energy loss E under low temperature vehicle driving conditions loss ;

[0077] Specifically, confirm the total available energy E of the power battery at room temperature; based on the SOC that cannot be discharged retain The proportion μ of the total available SOC interval is used to calculate the energy E2 that cannot be released, which satisfies the formula: Energy E2 = μ*total available energy E of the power battery at room temperature;

[0078] Exemplarily, in the embodiment of the present invention, E2=8.3%×83.5 kWh=6.9 kWh.

[0079] Specifically, the energy loss value E1 and the energy lost due to failure to release E2, the total energy loss under low temperature CLTC conditions E loss Satisfy the formula: E loss =E1+E2;

[0080] For example, in the embodiment of the present invention, E loss =2.1kWh+6.9kWh=9kWh.

[0081] Based on the total available energy E of the power battery at room temperature and the total energy lost under low temperature CLTC conditions E loss , the low temperature energy retention rate η is calculated, which satisfies the formula: low temperature energy retention rate η=(EE loss ) / E;

[0082] Exemplarily, in this embodiment, η=(83.5kWh-9kWh) / 83.5kWh=89.2%.

[0083] Step T7, calculating the low-temperature energy retention rate of the power battery, specifically: low-temperature energy retention rate of the power battery = (total available energy of the power battery at room temperature E - total energy loss under low-temperature vehicle driving conditions E) loss ) / Total available energy E of the power battery at room temperature.

[0084] For the method steps disclosed in the above embodiments, the method steps are described as a series of action combinations for the purpose of simple description, but those skilled in the art should know that the embodiments of the present invention are not limited by the order of the actions described, because according to the embodiments of the present invention, some steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions involved are not necessarily required by the embodiments of the present invention.

[0085] Any process or method description described in a flowchart or other manner may be understood as representing a module, fragment or portion of a code including one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations, in which the order shown or discussed may not be followed, including executing and implementing the functions in a substantially simultaneous manner or in a reverse order according to the functions involved, or executing computer instructions and implementing the corresponding functions according to program structures such as loops and branches, which will naturally be understood by those skilled in the art when implementing the embodiments of the present invention.

[0086] like Figure 2 The architecture diagram of the power battery low temperature energy retention rate calculation system shown in the figure specifically includes:

[0087] The module of relationship between time and battery charge and discharge current is used to simulate the relationship curve between time and battery charge and discharge current according to the vehicle driving conditions and battery charge and discharge power;

[0088] Energy loss value calculation module, determines the DC internal resistance DCR of the power battery cell, the total duration of the vehicle driving cycle, the number of power batteries in series and parallel, and the SOC at the end of the operating condition end value;

[0089] The energy loss value E1 converted into heat is obtained according to the time integral, and the upper and lower limits of the power battery SOC are determined;

[0090] A module for calculating the ratio of the SOC value that cannot be released to the total available SOC interval, used to calculate the SOC value that cannot be released and the ratio of the SOC value that cannot be released to the total available SOC interval;

[0091] The energy calculation module that cannot be discharged multiplies the total available energy E of the power battery at room temperature by the ratio of the SOC value that cannot be discharged to the total available SOC range, and calculates the energy E2 that cannot be discharged;

[0092] The total energy loss calculation module under low-temperature vehicle driving conditions is used to add the energy loss value converted into heat and the energy lost that cannot be released to calculate the total energy loss E under low-temperature vehicle driving conditions. loss ;

[0093] The power battery low temperature energy retention rate calculation module calculates the power battery low temperature energy retention rate, specifically: power battery low temperature energy retention rate = (power battery total available energy at room temperature E-total energy loss under low temperature vehicle driving conditions E loss ) / total available energy E of the power battery at room temperature.

[0094] It is worth noting that although only some basic functional modules are disclosed in the embodiments of the present invention, it does not mean that the composition of the present system is limited to the above basic functional modules. On the contrary, what the present embodiment wants to express is that on the basis of the above basic functional modules, those skilled in the art can arbitrarily add one or more functional modules in combination with the prior art to form an infinite number of embodiments or technical solutions. In other words, the present system is open rather than closed. Just because the present embodiment only discloses individual basic functional modules, it cannot be considered that the protection scope of the claims of the present invention is limited to the disclosed basic functional modules. At the same time, for the convenience of description, the above devices are described in terms of functions and are described separately in various units and modules. Of course, when implementing the present invention, the functions of each unit and module can be implemented in the same or one or more software and / or hardware.

[0095] The implementation methods of the system described above are merely illustrative, for example, the various functional modules, units or subsystems in the system may or may not be physically separated, or may or may not be physical units, that is, they may be located in the same place, or they may be distributed to multiple different systems and their subsystems or modules. Those skilled in the art may select some or all of the functional modules, units or subsystems according to actual needs to achieve the purpose of the embodiments of the present invention, and those of ordinary skill in the art may understand and implement the above-mentioned situations without creative work.

[0096] like Figures 3 to 6 The specific application scenario of the embodiment of the present invention shown is:

[0097] Step S1: confirm the low-temperature energy retention rate evaluation condition. In the embodiment of the present invention, the Chinese light vehicle driving condition (CLTC) is adopted, referred to as the CLTC condition. The definition of the CLTC condition is detailed in GB / T38146.1-2019 "China Automobile Driving Conditions Part 1: Light Vehicles".

[0098] Step S2: Perform simulation analysis based on CLTC working conditions and obtain the following results: Figure 3 The relationship curve between time t and battery charging and discharging power p is shown.

[0099] Step S3: Based on the relationship curve between time t and battery charge and discharge power p obtained in step S2, the simulation results are as follows: Figure 4 The relationship curve between time t and battery charging and discharging current I is shown.

[0100] Step S4: confirm the relationship map of the power battery single DC internal resistance DCR and the power battery state of charge SOC and battery temperature T. Exemplarily, the original data table of the map is:

[0101]

[0102]

[0103] Step S5: Confirm the low temperature starting temperature T to be calculated 起始 The simulation results show that the total duration of the CLTC cycle that can be completed at this starting temperature is t total and SOC at the end of the working condition end In this embodiment, T 起始 =-20℃, t obtained by simulation total =25020s, SOC end =10.8%.

[0104] Step S6: confirm the series-parallel number mPnS of this type of power battery. In the embodiment of the present invention, m is 2 and n is 108, that is, the series-parallel number is 2P108S.

[0105] Step S7: Based on the above-calculated power battery charge and discharge current I, power battery DC internal resistance DCR and the total duration t of the CLTC cycle condition that can be completed total , the energy loss converted into heat is calculated by integrating ampere-hours In the example, it is calculated that E1 = 2.1 kWh.

[0106] Step S8: Confirm the SOC upper limit SOC of the power battery of this type upper and use lower limit SOC lower ,Exemplary,SOC upper =97%, SOC lower =3%.

[0107] Step S9: SOC at the end of the working condition obtained in step S5 end , calculate the SOC that cannot be released retain =SOC end -SOC lower In this embodiment, SOC retain =SOC end -SOC lower =10.8%-3%=7.8%.

[0108] Step S10: Calculate the SOC that cannot be released retain The proportion of the total available SOC range μ

[0109] =SOC retain / (SOC upper -SOC lower ), exemplarily, in the embodiment of the present invention, μ=7.8% / (97%-3%)=8.3%.

[0110] Step S11: confirm the total available energy E of the power battery of this type at room temperature. In this embodiment, E=83.5 kWh.

[0111] Step S12: The SOC that cannot be released calculated according to step S10 retain The energy lost due to failure to release is calculated as a proportion μ of the total available SOC interval, and in this embodiment, E2=8.3%×83.5kWh=6.9kWh.

[0112] Step S13: Calculate the total energy loss E under low temperature CLTC condition based on E1 calculated in step S7 and E2 calculated in step S12 loss =E1+E2, in this embodiment, E loss =2.1kWh+6.9kWh=9kWh.

[0113] Step S14: The total available energy E of the battery at room temperature confirmed by S11 and the total energy loss E of the low temperature CLTC condition calculated by S13 loss , the low temperature energy retention rate η is calculated to be (EE loss ) / E, in this embodiment, η=(83.5kWh-9kWh) / 83.5kWh=89.2%.

[0114] Those skilled in the art will appreciate that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those generally understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless specifically defined.

[0115] It should be noted that certain words are used in this specification and claims to refer to specific components. Those skilled in the art should understand that different manufacturers and producers may use different terms to refer to the same component. This specification and claims do not use the difference in terms as a way to distinguish components, but use the difference in the functions of the components as the criterion for distinction.

[0116] like Figure 7 As shown, the present invention also discloses an electronic device and a storage medium corresponding to the method for calculating the low temperature energy retention rate of a power battery:

[0117] An electronic device comprises: a processor, a communication interface, a memory and a communication bus, wherein:

[0118] The processor, the communication interface, and the memory communicate with each other via a communication bus; a computer program is stored in the memory, and when the computer program is executed by the processor, the processor executes the steps of the method for calculating the low-temperature energy retention rate of a power battery.

[0119] A computer-readable storage medium stores a computer program executable by an electronic device. When the computer program runs on the electronic device, the electronic device executes the steps of a method for calculating a low-temperature energy retention rate of a power battery.

[0120] The above-mentioned processor can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

[0121] The communication bus mentioned in the above electronic device can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The communication bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, only one thick line is used in the figure, but it does not mean that there is only one bus or one type of bus.

[0122] The electronic device includes a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system. The hardware layer includes hardware such as a central processing unit (CPU), a memory management unit (MMU), and a memory. The operating system can be any one or more computer operating systems that implement electronic device control through a process, such as a Linux operating system, a Unix operating system, an Android operating system, an iOS operating system, or a Windows operating system. In addition, in an embodiment of the present invention, the electronic device can be a handheld device such as a smart phone or a tablet computer, or can be an electronic device such as a desktop computer or a portable computer, which is not particularly limited in the embodiment of the present invention.

[0123] The execution subject of the electronic device control in the embodiment of the present invention may be an electronic device, or a functional module in the electronic device that can call and execute a program. The electronic device may obtain the firmware corresponding to the storage medium. The firmware corresponding to the storage medium is provided by the supplier. The firmware corresponding to different storage media may be the same or different, which is not limited here. After the electronic device obtains the firmware corresponding to the storage medium, the firmware corresponding to the storage medium may be written into the storage medium, specifically, the firmware corresponding to the storage medium may be burned into the storage medium. The process of burning the firmware into the storage medium may be implemented using existing technology, which will not be described in detail in the embodiment of the present invention.

[0124] The electronic device may also obtain a reset command corresponding to the storage medium. The reset command corresponding to the storage medium is provided by the supplier. The reset commands corresponding to different storage media may be the same or different, and are not limited here.

[0125] At this time, the storage medium of the electronic device is a storage medium in which the corresponding firmware is written, and the electronic device can respond to the reset command corresponding to the storage medium in the storage medium in which the corresponding firmware is written, so that the electronic device resets the storage medium in which the corresponding firmware is written according to the reset command corresponding to the storage medium. The process of resetting the storage medium according to the reset command can be implemented by the existing technology and will not be described in detail in the embodiments of the present invention.

[0126] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0127] In addition, those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and form different embodiments. For example, any one of the embodiments claimed in the claims can be used in any combination in the embodiments of the present invention.

[0128] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0129] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0130] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any way. Any feature disclosed in this specification, unless otherwise stated, can be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features. Throughout the specification, the same reference numerals indicate the same elements.

[0131] Those skilled in the art will appreciate that the modules in the devices in the embodiments can be adaptively changed and set in one or more devices different from the embodiments. The modules or units or components in the embodiments can be combined into one module or unit or component, and in addition they can be divided into multiple submodules or subunits or subcomponents. Except that at least some of such features and / or processes or units are mutually exclusive, all features disclosed in this specification (including corresponding claims, abstracts and drawings) and all processes or units of any method or device disclosed in this manner can be combined in any combination. Unless otherwise explicitly stated, each feature disclosed in this specification (including corresponding claims, abstracts and drawings) can be replaced by an alternative feature that provides the same, equivalent or similar purpose.

[0132] In the several embodiments provided by the present invention, it should be understood that the disclosed systems, devices and methods can be implemented in other ways, for example: the device embodiments described above are only schematic; for example: the division of units is only a logical function division, and there may be other division methods in actual implementation; for example, multiple units or components can be combined or integrated into another system, or some features can be ignored, or some instructions are not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms not shown.

[0133] In this application, the word "exemplary" is used to mean "used as an example, illustration, or description." Any embodiment described in this application as "exemplary" is not necessarily to be construed as being preferred or advantageous over other embodiments. The following description is given to enable any technician in the field to implement and use the present application. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the present application can be implemented without using these specific details. In other instances, well-known structures and processes will not be elaborated in detail to avoid obscuring the description of the present application with unnecessary details. Therefore, the present application is not intended to be limited to the embodiments shown, but is consistent with the widest scope consistent with the principles and features disclosed in the present application.

[0134] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for calculating the low temperature energy retention rate of a power battery, characterized in that: Specifically include: According to the vehicle driving conditions and battery charging and discharging power, the relationship curve between time and battery charging and discharging current is obtained through simulation; Determine the DC internal resistance DCR of the power battery cell, the total duration of the vehicle driving cycle, the number of power batteries in series and parallel, and the SOC at the end of the operating condition end value; The energy loss value E1 converted into heat is obtained according to the time integral, and the upper and lower limits of the power battery SOC are determined; Calculate the SOC value that cannot be released and the proportion of the SOC value that cannot be released to the total available SOC range; Multiply the total available energy E of the power battery at room temperature by the ratio of the SOC value that cannot be discharged to the total available SOC range to calculate the energy lost due to failure to discharge E2; Add the energy loss converted into heat and the energy lost that cannot be released to get the total energy loss E under low temperature vehicle driving conditions. loss ; Calculate the low-temperature energy retention rate of the power battery, specifically: low-temperature energy retention rate of the power battery = (total available energy of the power battery at room temperature E-total energy loss under low-temperature vehicle driving conditions E loss ) / total available energy E of the power battery at room temperature.

2. The method for calculating the low temperature energy retention rate of a power battery according to claim 1, characterized in that: According to the vehicle driving conditions and battery charging and discharging power, the relationship curve between time and battery charging and discharging current is obtained by simulation, specifically: Perform simulation analysis based on the vehicle driving conditions to obtain the relationship curve between time and battery charging and discharging power; According to the relationship curve between time and battery charge and discharge power, the relationship curve between time and battery charge and discharge current is obtained by simulation.

3. The method for calculating the low temperature energy retention rate of a power battery according to claim 1, characterized in that: The method for determining the DC internal resistance of the power battery cell, the total duration of the vehicle driving cycle, the number of power batteries connected in series and parallel, and the SOC at the end of the operating condition end Values, specifically: Confirm the relationship map between the DC internal resistance DCR of the power battery cell and the power battery state of charge SOC and battery temperature T; Confirm the low temperature starting temperature T to be calculated 起始 The simulation results show that the total duration of the CLTC cycle that can be completed at the low temperature starting temperature is t total And SOC at the end of the working condition end value; Confirm the number of power batteries in series and parallel, mPnS.

4. The method for calculating the low temperature energy retention rate of a power battery according to claim 1, characterized in that: The energy loss value E1 converted into heat is obtained according to the time integral, specifically: Power battery charge and discharge current I, power battery DC internal resistance DCR and the total duration of the CLTC cycle that can be completed t total , the energy loss value E1 satisfies the following formula:

5. The method for calculating the low temperature energy retention rate of a power battery according to claim 1, characterized in that: The calculation of the SOC value that cannot be released, and the ratio of the SOC value that cannot be released to the total available SOC range, are specifically: Confirm the power battery SOC usage upper limit SOC upper and use lower limit SOC lower ; According to the SOC at the end of the working condition end value, calculate the SOC that cannot be released retain , satisfying the following formula: SOC that cannot be released retain = SOC at the end of the working condition end Value - Use lower limit SOC lower ; Calculate the SOC that cannot be released retain The proportion μ of the total available SOC interval satisfies the following formula: retain The proportion of the total available SOC range μ = the SOC that cannot be released retain / (SOC upper -SOC lower ).

6. A power battery low temperature energy retention rate calculation system, characterized in that: Specifically include: The module of relationship between time and battery charge and discharge current is used to simulate the relationship curve between time and battery charge and discharge current according to the vehicle driving conditions and battery charge and discharge power; Energy loss value calculation module, determines the DC internal resistance DCR of the power battery cell, the total duration of the vehicle driving cycle, the number of power batteries in series and parallel, and the SOC at the end of the operating condition end value; The energy loss value E1 converted into heat is obtained according to the time integral, and the upper and lower limits of the power battery SOC are determined; A module for calculating the ratio of the SOC value that cannot be released to the total available SOC interval, used to calculate the SOC value that cannot be released and the ratio of the SOC value that cannot be released to the total available SOC interval; The energy calculation module that cannot be released multiplies the total available energy E of the power battery at room temperature by the ratio of the SOC value that cannot be released to the total available SOC range, and calculates the energy E2 that cannot be released; The total energy loss calculation module under low-temperature vehicle driving conditions is used to add the energy loss value converted into heat and the energy lost that cannot be released to calculate the total energy loss E under low-temperature vehicle driving conditions. loss ; The power battery low temperature energy retention rate calculation module calculates the power battery low temperature energy retention rate, specifically: power battery low temperature energy retention rate = (power battery total available energy at room temperature E-total energy loss under low temperature vehicle driving conditions E loss ) / total available energy E of the power battery at room temperature.

7. An electronic device, characterized in that: include: A processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other via the communication bus; a computer program is stored in the memory, and when the computer program is executed by the processor, the processor executes the steps of the method described in any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that: It stores a computer program executable by an electronic device, and when the computer program runs on the electronic device, the electronic device executes the steps of the method described in any one of claims 1 to 5.

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