Methods and devices for calculating battery heat generation, batteries and vehicles

Abstract

This invention discloses a method and apparatus for calculating battery heat generation, a battery, and a vehicle. The method includes: acquiring the battery's current SOC value, battery operating conditions, current value under the battery operating conditions, and current temperature; determining the battery's Joule heat and chemical reaction heat based on the current SOC value, battery operating conditions, current value under the battery operating conditions, and current temperature; and determining the battery's heat output based on the chemical reaction heat and Joule heat. The method of this invention considers the chemical reaction heat component during the battery charging and discharging process when calculating battery heat output, enabling accurate calculation of battery heat output and improving the accuracy of battery heat output calculation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery heat generation calculation method, a battery heat generation calculation device, a battery and a vehicle. BACKGROUND

[0002] New energy vehicles mainly use lithium ion batteries as power sources. A large amount of heat is generated in the process of charging and discharging due to the material characteristics and chemical reactions of the battery. If the heat is not removed in time, it will cause the battery performance to decline, the service life to be shortened, and even safety accidents to occur. In terms of the whole vehicle, it will be manifested as a decrease in output power, a longer charging time, and the safety of the whole vehicle. Accurate evaluation of the battery heat generation is crucial in the development process of the thermal management system. In addition, the battery warranty is closely related to the accurate evaluation of the heat generation.

[0003] At present, in the related art, the battery heat generation is directly estimated by using the direct current resistance method. Since the battery heat generation is caused by the material characteristics and chemical reactions of the battery, the above-mentioned direct current resistance estimation method ignores the heat generated by the chemical reactions of the battery, which has a large deviation from the actual value and low calculation accuracy. SUMMARY

[0004] The present application aims to at least solve one of the technical problems in the related art. To this end, the first object of the present application is to provide a battery heat generation calculation method, which considers the chemical reaction heat part in the process of charging and discharging of the battery, can accurately calculate the heat generation of the battery, and improves the calculation accuracy of the battery heat generation.

[0005] The second object of the present application is to provide a battery heat generation calculation device.

[0006] The third object of the present application is to provide a battery.

[0007] The fourth object of the present application is to provide a vehicle.

[0008] To achieve the above-mentioned objects, the first aspect of the present application provides a battery heat generation calculation method, comprising: obtaining a current SOC (State Of Charge) value of the battery, a battery operating condition, a current value under the battery operating condition and a current temperature; determining a Joule heat of the battery and a chemical reaction heat of the battery according to the current SOC value, the battery operating condition, the current value under the battery operating condition and the current temperature; and determining the battery heat generation according to the chemical reaction heat and the Joule heat.

[0009] According to the battery heat generation calculation method of this invention, the current SOC value, battery operating condition, current value under the battery operating condition, and current temperature are first obtained. Then, the Joule heat and chemical reaction heat of the battery are determined based on the current SOC value, battery operating condition, current value under the battery operating condition, and current temperature. Finally, the battery heat generation is determined based on the chemical reaction heat and Joule heat. Therefore, this method considers the chemical reaction heat during the battery charging and discharging process when calculating battery heat generation, enabling accurate calculation of battery heat generation and improving the accuracy of battery heat generation calculation.

[0010] In addition, the battery heat generation calculation method according to the above embodiments of the present invention may also have the following additional technical features:

[0011] According to one embodiment of the present invention, determining the chemical reaction heat of the battery based on the current SOC value, battery operating condition, current value under the battery operating condition, and current temperature includes: obtaining the correspondence between SOC value, battery operating condition, and compensation coefficient; determining the compensation coefficient based on the current SOC value, battery operating condition, and the correspondence; and determining the chemical reaction heat based on the current temperature, current value, and compensation coefficient.

[0012] According to one embodiment of the present invention, obtaining the correspondence between SOC value, battery operating condition, and compensation coefficient includes: determining the battery internal resistance based on the calibration temperature, calibration SOC value, and calibration battery operating condition, and determining the calibration Joule heat based on the battery internal resistance; determining the internal energy change heat of the battery based on the battery temperature change curve and the battery's basic parameters; determining the heat exchange between the battery and the external environment based on the battery temperature change curve and the external ambient temperature; determining the chemical reaction heat based on the internal energy change heat, the heat exchange between the battery and the external environment, and the Joule heat; and determining the calibration compensation coefficient based on the chemical reaction heat, the current value under the battery operating condition, and the battery's current temperature.

[0013] According to one embodiment of the present invention, the heat of change in the internal energy of the battery is determined by the following formula:

[0014]

[0015] Where Q1 represents the heat of change in the battery's internal energy, m represents the battery's mass, and c represents the battery's specific heat capacity. This represents the derivative of the battery's temperature with respect to time.

[0016] According to one embodiment of the present invention, the heat exchange between the battery and the external environment is determined by the following formula:

[0017] Q2 = h·A(Tcell - Tamb)

[0018] Where Q2 represents the heat exchange between the battery and the external environment, h represents the surface heat transfer coefficient of the battery, A represents the surface area of ​​the battery, Tcell represents the calibration temperature, and Tamb represents the external ambient temperature.

[0019] According to one embodiment of the present invention, the heat of chemical reaction is determined by the following formula:

[0020] Q3 = Q1 + Q2 - Q

[0021] Where Q3 represents the heat of chemical reaction, Q2 represents the heat exchange between the battery and the external environment, Q1 represents the heat of internal energy change of the battery, and Q represents the calibrated Joule heat.

[0022] According to one embodiment of the present invention, the compensation coefficient is determined by the following formula:

[0023] k = Q3 / I·Tcell

[0024] Where k represents the calibration compensation coefficient, Q3 represents the heat of chemical reaction, I represents the current value under battery operating conditions, and Tcell represents the calibration temperature.

[0025] According to one embodiment of the present invention, determining the Joule heat of the battery based on the current SOC value, battery operating conditions, current value under the battery operating conditions, and current temperature includes: determining the battery internal resistance based on the current SOC value, battery operating conditions, and current temperature; and determining the Joule heat based on the battery internal resistance and current value.

[0026] To achieve the above objectives, a second aspect of the present invention provides a battery heat generation calculation device, comprising: a first acquisition module for acquiring the current SOC value of the battery; a second acquisition module for acquiring the battery operating condition; a third acquisition module for acquiring the current value under the battery operating condition; a fourth acquisition module for acquiring the current temperature of the battery; a first determination module for determining the Joule heat and chemical reaction heat of the battery based on the current SOC value, the battery operating condition, the current value under the battery operating condition, and the current temperature; and a second determination module for determining the battery heat generation based on the chemical reaction heat and the Joule heat.

[0027] According to an embodiment of the present invention, a battery heat generation calculation device comprises a first acquisition module acquiring the current SOC value of the battery, a second acquisition module acquiring the battery operating condition, a third acquisition module acquiring the current value under the battery operating condition, and a fourth acquisition module acquiring the current temperature of the battery. A first determination module determines the Joule heat and the chemical reaction heat of the battery based on the current SOC value, the battery operating condition, the current value under the battery operating condition, and the current temperature. A second determination module determines the battery heat generation based on the chemical reaction heat and the Joule heat. Therefore, this device considers the chemical reaction heat during the battery charging and discharging process when calculating battery heat generation, enabling accurate calculation of battery heat generation and improving the accuracy of battery heat generation calculation.

[0028] To achieve the above objectives, a third aspect of the present invention provides a battery, including a memory, a processor, and a battery heat calculation program stored in the memory and executable on the processor. When the processor executes the battery heat calculation program, it implements the above-described battery heat calculation method.

[0029] According to the battery of the present invention, by performing the above-described battery heat generation calculation method, the heat generation of the battery can be accurately calculated, thereby improving the accuracy of the battery heat generation calculation.

[0030] To achieve the above objectives, a fourth aspect of the present invention provides a vehicle including the battery described in the above embodiments.

[0031] According to embodiments of the present invention, the vehicle's overall safety can be improved by using the aforementioned battery.

[0032] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0033] Figure 1 A flowchart illustrating a method for calculating battery heat generation according to an embodiment of the present invention;

[0034] Figure 2 A table showing the temperature-SOC-battery internal resistance according to an embodiment of the present invention;

[0035] Figure 3 A flowchart illustrating the correspondence between SOC value, battery operating condition, and compensation coefficient according to an embodiment of the present invention;

[0036] Figure 4 This is a block diagram of a battery heat generation calculation device according to an embodiment of the present invention;

[0037] Figure 5 A block diagram of a battery according to an embodiment of the present invention;

[0038] Figure 6 This is a block diagram of a vehicle according to an embodiment of the present invention. Detailed Implementation

[0039] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0040] The following description, with reference to the accompanying drawings, illustrates the battery heat generation calculation method, battery heat generation calculation device, battery, and vehicle according to embodiments of the present invention.

[0041] Figure 1 This is a flowchart of a method for calculating battery heat generation according to an embodiment of the present invention.

[0042] like Figure 1 As shown, the method for calculating battery heat generation according to an embodiment of the present invention may include the following steps:

[0043] S1 acquires the battery's current SOC value, battery operating condition, current value under the battery operating condition, and current temperature. The battery operating condition includes battery charging and battery discharging.

[0044] Specifically, the battery management system in the battery can use sensors to detect the battery's voltage, current, and current temperature in real time, calculate the battery's current SOC value, and determine the battery's operating condition, i.e. whether the battery is in a charging or discharging state, and obtain the battery's current value under the current operating condition through sensors.

[0045] S2 determines the Joule heat and chemical reaction heat of the battery based on the current SOC value, battery operating conditions, current value under battery operating conditions, and current temperature.

[0046] According to one embodiment of the present invention, determining the Joule heat of the battery based on the current SOC value, battery operating conditions, current value under the battery operating conditions, and current temperature includes: determining the battery internal resistance based on the current SOC value, battery operating conditions, and current temperature; and determining the Joule heat based on the battery internal resistance and current value.

[0047] Specifically, before batteries leave the factory, manufacturers can create a table showing the battery's internal resistance under different temperatures, states of charge (SOC), and charge / discharge conditions, and store this table in the battery management system. The internal resistance at different temperatures, SOCs, and charge / discharge conditions can be obtained through battery pulse testing, specifically using HPPC (Hybrid Pulse Power Characteristic) testing. As an example, the battery internal resistance data for different temperatures and SOC values ​​are as follows: Figure 2 As shown, the horizontal axis represents the State of Charge (SOC) as a percentage, and the vertical axis represents the battery temperature.

[0048] The battery management system looks up the battery's internal resistance R based on the current SOC value, operating conditions, and temperature. Then, it calculates the current Joule heat Q' of the battery based on the internal resistance R and the current current value I', where Q' = I' * I' * R.

[0049] According to one embodiment of the present invention, determining the chemical reaction heat of the battery based on the current SOC value, battery operating condition, current value under the battery operating condition, and current temperature includes: obtaining the correspondence between SOC value, battery operating condition, and compensation coefficient; determining the compensation coefficient based on the current SOC value, battery operating condition, and the correspondence; and determining the chemical reaction heat based on the current temperature, current value, and compensation coefficient.

[0050] Specifically, before the battery leaves the factory, the manufacturer can test the battery under calibrated conditions, test the compensation coefficient k corresponding to each SOC value of the battery in the charging and discharging states, and make curves of the compensation coefficient k corresponding to each SOC value in the charging and discharging states for different SOC values. From this, the correspondence between SOC value, battery operating conditions and compensation coefficient is obtained, and the correspondence between SOC value, battery operating conditions and compensation coefficient is stored in the battery management system.

[0051] During battery operation, the battery management system first determines whether the battery is in a charging or discharging state, and obtains the current SOC value, the current value I' under the battery's operating condition, and the current temperature T. Then, based on the battery's operating condition, it calls the corresponding SOC value-battery operating condition-compensation coefficient relationship, and determines the compensation coefficient k based on the current SOC value. Next, it calculates the current chemical reaction heat Q3' of the battery based on the current temperature T, current value I', and compensation coefficient k, where Q3' = k * I' * T. When the battery is in a charging state, the current value is negative; when the battery is in a discharging state, the current value is positive.

[0052] S3, the heat generation of the battery is determined based on the heat of chemical reaction and the heat of Joule reaction.

[0053] Specifically, after calculating the current Joule heat Q' and current chemical reaction heat Q3' of the battery through step S2 above, the two are summed to obtain the battery heat output Q. 总 Q 总 =Q'+Q3'=I'*I'*R+k*I'*T.

[0054] Therefore, the battery heat generation calculation method of this invention takes into account the heat of chemical reaction during the battery charging and discharging process when calculating battery heat generation, which can accurately calculate battery heat generation and improve the accuracy of battery heat generation calculation.

[0055] The following detailed explanation, with reference to an embodiment, illustrates the specific process for obtaining the correspondence between SOC value, battery operating condition, and compensation coefficient. It should be noted that this correspondence is obtained under a calibration environment. The calibration environment involves placing 1-3 thermocouples on the surface of the battery under test to monitor its temperature in real time. Two additional batteries identical to the battery under test are selected, with the battery under test placed in the center and the other two batteries placed on either side. The three batteries are connected in series and tightly secured together with insulating elastic material. This provides a near-insulating environment for the battery under test. To improve accuracy, the three batteries are treated as a single unit, wrapped with insulating cotton, and placed in a sealed empty box. Testing equipment and charge / discharge equipment are connected externally to the battery under test to perform constant current (e.g., 1C) charge / discharge, and the battery's calibration temperature and calibrated SOC value are measured in real time.

[0056] like Figure 3 As shown, according to an embodiment of the present invention, obtaining the correspondence between SOC value, battery operating condition, and compensation coefficient may include the following steps:

[0057] S201 determines the battery internal resistance based on the calibration temperature, calibration SOC value, and calibration battery operating conditions, and determines the calibration Joule heat based on the battery internal resistance.

[0058] Specifically, under calibration conditions, the battery under test is subjected to constant current charging and discharging. Taking discharging as an example, the discharging device can be set to discharge the battery with a current of 1C (i.e., 1 times the battery capacity), denoted as I. During the discharging process, the battery calibration temperature Tcell is measured in real time by the testing device, and the battery calibration SOC value is calculated. Based on the calibration temperature, calibration SOC value, and calibration battery operating conditions, the battery internal resistance R can be determined by looking up a table. Based on the current value I and the battery internal resistance R, the calibration Joule heat Q can be calculated, where the calibration Joule heat Q = I * I * R.

[0059] It should be noted that the calibrated joule heat during battery charging can be calculated in the same way, which will not be elaborated here.

[0060] S202, determine the heat of change in the internal energy of the battery based on the battery temperature change curve and the basic parameters of the battery.

[0061] According to one embodiment of the present invention, the heat of change in the internal energy of the battery is determined by the following formula:

[0062]

[0063] Where Q1 represents the heat of change in the battery's internal energy, m represents the battery's mass, and c represents the battery's specific heat capacity. This represents the derivative of the battery's temperature with respect to time.

[0064] Specifically, continuing with the discharge example, the battery temperature changes during discharge. The testing equipment uses thermocouples mounted on the battery surface to monitor the battery temperature Tcell in real time, obtaining a curve showing the change of Tcell over time. Taking the derivative of this curve yields the rate of temperature change of the battery. Battery temperature change rate Substituting the battery's mass m and specific heat capacity c into the above formula (1), the heat of change of the battery's internal energy Q1 can be obtained.

[0065] It should be noted that the change in internal energy and heat of the battery during charging can be calculated in the same way, which will not be elaborated here.

[0066] S203 determines the heat exchange between the battery and the external environment based on the battery temperature change curve and the external ambient temperature.

[0067] According to one embodiment of the present invention, the heat exchange between the battery and the external environment is determined by the following formula:

[0068] Q2=h·A(Tcell-Tamb) (2)

[0069] Where Q2 represents the heat exchange between the battery and the external environment, h represents the surface heat transfer coefficient of the battery, A represents the surface area of ​​the battery, Tcell represents the calibration temperature, and Tamb represents the external ambient temperature.

[0070] Specifically, to determine the heat exchange Q2 between the battery and the external environment, it is necessary to first obtain the surface heat transfer coefficient h of the battery. The surface heat transfer coefficient h can be obtained experimentally using the lumped parameter method. The specific process is as follows: Set the battery to be tested in the same environment as the calibration environment, and place the battery in a high-low temperature chamber. First, set the high-low temperature chamber to 45℃ and let the battery stand until it reaches the same temperature as the environment. Then, adjust the temperature of the high-low temperature chamber to 25℃ and record the battery's temperature drop process. The battery is treated using the lumped parameter method, and the environmental influence is equivalent to convective heat transfer. The influence of the calibration environment on the battery is then used to obtain the heat transfer coefficient h. It should be noted that the lumped parameter method treats the battery as a uniform heat-generating body. During the static cooling process, the battery surface exchanges heat with the external environment through convection.

[0071] During the above experiment, the surface temperature of the battery was collected by thermocouples, and the temperature T over time was recorded. By taking the derivative of this curve, the rate of temperature change of the battery under static conditions can be obtained. The surface temperature Tcell' and ambient temperature Tamb' of the battery in a static state were obtained using testing equipment, and the temperature change rate of the battery in a static state was calculated. Substitute the battery surface temperature Tcell' and the ambient temperature Tamb' into the following formula:

[0072]

[0073] The surface heat transfer coefficient h of the battery can then be calculated.

[0074] After obtaining the surface heat transfer coefficient h of the battery, the surface heat transfer coefficient h of the battery, the surface area A of the battery, the calibration temperature Tcell, and the external ambient temperature Tamb are substituted into the above formula (2) to obtain the heat exchange Q2 between the battery and the external environment.

[0075] S204, the heat of chemical reaction is determined based on the heat of internal energy change, the heat exchange between the battery and the external environment, and the Joule heat.

[0076] According to one embodiment of the present invention, the heat of chemical reaction is determined by the following formula:

[0077] Q3 = Q1 + Q2 - Q (3)

[0078] Where Q3 represents the heat of chemical reaction, Q2 represents the heat exchange between the battery and the external environment, Q1 represents the heat of internal energy change of the battery, and Q represents the calibrated Joule heat.

[0079] Specifically, during the charging and discharging process of a battery, the heat generated by the battery is the sum of the heat exchanged between the battery and the external environment (Q2) and the heat of change in the battery's internal energy (Q1). According to the law of conservation of energy, the heat generated by the battery minus the rated Joule heat yields the heat of chemical reaction. Substituting the heat exchanged between the battery and the external environment (Q2), the heat of change in the battery's internal energy (Q1), and the rated Joule heat (Q) into the above formula (3) yields the heat of chemical reaction (Q3). Therefore, the heat of chemical reaction (Q3) at the corresponding state of charge (SOC) of the battery can be calculated.

[0080] S205 determines the calibration compensation coefficient based on the heat of chemical reaction, the current value under battery operating conditions, and the current temperature of the battery.

[0081] According to one embodiment of the present invention, the compensation coefficient is determined by the following formula:

[0082] k = Q3 / I·Tcell (4)

[0083] Where k represents the calibration compensation coefficient, Q3 represents the heat of chemical reaction, I represents the current value under battery operating conditions, and Tcell represents the calibration temperature.

[0084] Specifically, after obtaining the chemical reaction heat Q3 through step S204 above, the calibration temperature Tcell and the current value I under the battery operating conditions are substituted into the above formula (4) to obtain the curves of the compensation coefficient k under different SOC conditions during charging and discharging. Among them, the current value I is negative in the charging state and positive in the discharging state. Thus, through the above steps S201-S205, the correspondence between SOC value, battery operating conditions and compensation coefficient is obtained.

[0085] In summary, the battery heat generation calculation method according to embodiments of the present invention first obtains the battery's current SOC value, battery operating condition, current value under the battery operating condition, and current temperature. Then, based on the current SOC value, battery operating condition, current value under the battery operating condition, and current temperature, it determines the battery's Joule heat and chemical reaction heat. Finally, it determines the battery's heat generation based on the chemical reaction heat and Joule heat. Therefore, this method considers the chemical reaction heat during the battery charging and discharging process when calculating battery heat generation, enabling accurate calculation of battery heat generation and improving the accuracy of battery heat generation calculation.

[0086] Corresponding to the above embodiments, the present invention also proposes a device for calculating battery heat generation.

[0087] Figure 4 This is a block diagram of a battery heat generation calculation device according to an embodiment of the present invention.

[0088] like Figure 4As shown, the battery heat generation calculation device 100 of this embodiment may include: a first acquisition module 110, a second acquisition module 120, a third acquisition module 130, a fourth acquisition module 140, a first determination module 150, and a second determination module 160.

[0089] The first acquisition module 110 is used to acquire the current SOC value of the battery. The second acquisition module 120 is used to acquire the battery operating condition. The third acquisition module 130 is used to acquire the current value of the battery under the operating condition. The fourth acquisition module 140 is used to acquire the current temperature of the battery. The first determination module 150 is used to determine the Joule heat and chemical reaction heat of the battery based on the current SOC value, battery operating condition, current value under the operating condition, and current temperature. The second determination module 160 is used to determine the heat generation of the battery based on the chemical reaction heat and Joule heat.

[0090] According to one embodiment of the present invention, the first determining module 150 determines the chemical reaction heat of the battery based on the current SOC value, battery operating condition, current value under the battery operating condition, and current temperature. Specifically, it is used to: obtain the correspondence between SOC value, battery operating condition, and compensation coefficient; determine the compensation coefficient based on the current SOC value, battery operating condition, and the correspondence; and determine the chemical reaction heat based on the current temperature, current value, and compensation coefficient.

[0091] According to one embodiment of the present invention, the first determining module 150 obtains the correspondence between SOC value, battery operating condition, and compensation coefficient. Specifically, it is used to: determine the battery internal resistance based on the calibration temperature, calibration SOC value, and calibration battery operating condition; determine the calibration Joule heat based on the battery internal resistance; determine the internal energy change heat of the battery based on the battery temperature change curve and the battery's basic parameters; determine the heat exchange between the battery and the external environment based on the battery temperature change curve and the external ambient temperature; determine the chemical reaction heat based on the internal energy change heat, the heat exchange between the battery and the external environment, and the Joule heat; and determine the calibration compensation coefficient based on the chemical reaction heat, the current value under the battery operating condition, and the battery's current temperature.

[0092] According to one embodiment of the present invention, the first determining module 150 determines the heat of change in the internal energy of the battery using the following formula:

[0093]

[0094] Where Q1 represents the heat of change in the battery's internal energy, m represents the battery's mass, and c represents the battery's specific heat capacity. This represents the derivative of the battery's temperature with respect to time.

[0095] According to one embodiment of the present invention, the first determining module 150 determines the heat exchange between the battery and the external environment using the following formula:

[0096] Q2 = h·A(Tcell - Tamb)

[0097] Where Q2 represents the heat exchange between the battery and the external environment, h represents the surface heat transfer coefficient of the battery, A represents the surface area of ​​the battery, Tcell represents the calibration temperature, and Tamb represents the external ambient temperature.

[0098] According to one embodiment of the present invention, the first determining module 150 determines the heat of chemical reaction using the following formula:

[0099] Q3 = Q1 + Q2 - Q

[0100] Where Q3 represents the heat of chemical reaction, Q2 represents the heat exchange between the battery and the external environment, Q1 represents the heat of internal energy change of the battery, and Q represents the calibrated Joule heat.

[0101] According to one embodiment of the present invention, the first determining module 150 determines the compensation coefficient using the following formula:

[0102] k = Q3 / I·Tcell

[0103] Where k represents the calibration compensation coefficient, Q3 represents the heat of chemical reaction, I represents the current value under battery operating conditions, and Tcell represents the calibration temperature.

[0104] According to one embodiment of the present invention, the first determining module 150 determines the Joule heat of the battery based on the current SOC value, the battery operating condition, the current value under the battery operating condition, and the current temperature. Specifically, it is used to determine the battery internal resistance based on the current SOC value, the battery operating condition, and the current temperature; and to determine the Joule heat based on the battery internal resistance and the current value.

[0105] It should be noted that for details not disclosed in the battery heat generation calculation device of the present invention, please refer to the details disclosed in the battery heat generation calculation method of the present invention, which will not be repeated here.

[0106] According to an embodiment of the present invention, a battery heat generation calculation device comprises a first acquisition module acquiring the current SOC value of the battery, a second acquisition module acquiring the battery operating condition, a third acquisition module acquiring the current value under the battery operating condition, and a fourth acquisition module acquiring the current temperature of the battery. A first determination module determines the Joule heat and the chemical reaction heat of the battery based on the current SOC value, the battery operating condition, the current value under the battery operating condition, and the current temperature. A second determination module determines the battery heat generation based on the chemical reaction heat and the Joule heat. Therefore, this device considers the chemical reaction heat during the battery charging and discharging process when calculating battery heat generation, enabling accurate calculation of battery heat generation and improving the accuracy of battery heat generation calculation.

[0107] Corresponding to the above embodiments, the present invention also proposes a battery.

[0108] Figure 5 This is a block diagram of a battery according to an embodiment of the present invention.

[0109] like Figure 5 As shown, the battery 200 of this embodiment includes a memory 210, a processor 220, and a battery heat calculation program stored in the memory 210 and executable on the processor 220. When the processor 220 executes the battery heat calculation program, it implements the above-mentioned battery heat calculation method.

[0110] According to the battery of the present invention, by performing the above-described battery heat generation calculation method, the heat generation of the battery can be accurately calculated, thereby improving the accuracy of the battery heat generation calculation.

[0111] Corresponding to the above embodiments, the present invention also proposes a vehicle.

[0112] Figure 6 This is a block diagram of a vehicle according to an embodiment of the present invention.

[0113] like Figure 6 As shown, the vehicle 300 of this embodiment includes the battery 200 of the above embodiment.

[0114] According to embodiments of the present invention, the vehicle's overall safety can be improved by using the aforementioned battery.

[0115] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0116] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0117] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0118] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0119] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0120] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method of calculating the heat generation of a battery, characterized by, The method comprises: obtaining a current SOC value of the battery, a battery operating condition, a current value under the battery operating condition, and a current temperature; determining a Joule heat of the battery and a chemical reaction heat of the battery according to the current SOC value, the battery operating condition, the current value under the battery operating condition, and the current temperature; determining a heat generation of the battery according to the chemical reaction heat and the Joule heat; determining the chemical reaction heat of the battery according to the current SOC value, the battery operating condition, the current value under the battery operating condition, and the current temperature comprises: obtaining a corresponding relationship of an SOC value-battery operating condition-compensation coefficient; determining a compensation coefficient according to the current SOC value, the battery operating condition, and the corresponding relationship; determining the chemical reaction heat according to the current temperature, the current value, and the compensation coefficient; obtaining the corresponding relationship of the SOC value-battery operating condition-compensation coefficient comprises: determining a battery internal resistance according to a calibration temperature, a calibration SOC value, and a calibration battery operating condition, and determining a calibration Joule heat according to the battery internal resistance; determining an internal energy change heat of the battery according to a battery temperature change curve and basic parameters of the battery; determining a heat exchange between the battery and an external environment according to the battery temperature change curve and an external environment temperature; determining the chemical reaction heat according to the internal energy change heat, the heat exchange between the battery and the external environment, and the Joule heat; 2. The method of claim 1, wherein, determining a calibration compensation coefficient according to the chemical reaction heat, the current value under the battery operating condition, and the current temperature of the battery. wherein, represents the change in internal energy of the battery, represents the mass of the battery, represents the specific heat capacity of the battery, represents the derivative of the temperature of the battery with respect to time.

3. The method of claim 1, wherein, The internal energy change heat of the battery is determined by the following formula: wherein, represents the heat exchange amount of the battery with the external environment, represents the surface heat exchange coefficient of the battery, represents the surface area of the battery, represents the calibration temperature, represents the external environment temperature.

4. The method of claim 1, wherein, The heat exchange between the battery and the external environment is determined by the following formula: wherein, represents the heat of the chemical reaction, represents the heat exchange of the battery with the external environment, represents the change in the internal energy of the battery, represents the calibration joule heat.

5. The method of claim 1, wherein, The chemical reaction heat is determined by the following formula: wherein, denotes the calibration compensation coefficient, denotes the chemical reaction heat, denotes the current value in the battery operating condition, denotes the calibration temperature.

6. The method of claim 1, wherein, The compensation coefficient is determined by the following formula: determining the Joule heat of the battery according to the current SOC value, the battery operating condition, the current value under the battery operating condition, and the current temperature comprises: determining a battery internal resistance according to the current SOC value, the battery operating condition, and the current temperature; 7. A battery heat generation amount calculating device characterized by comprising: determining the Joule heat according to the battery internal resistance and the current value. The method comprises: a first obtaining module, configured to obtain a current SOC value of the battery; a second obtaining module, configured to obtain a battery operating condition; a third obtaining module, configured to obtain a current value under the battery operating condition; a fourth obtaining module, configured to obtain a current temperature of the battery; a first determining module, configured to determine a Joule heat of the battery and a chemical reaction heat of the battery according to the current SOC value, the battery operating condition, the current value under the battery operating condition, and the current temperature; a second determining module, configured to determine a heat generation of the battery according to the chemical reaction heat and the Joule heat; determining the chemical reaction heat of the battery according to the current SOC value, the battery operating condition, the current value under the battery operating condition, and the current temperature comprises: obtaining a corresponding relationship of an SOC value-battery operating condition-compensation coefficient; determining a compensation coefficient according to the current SOC value, the battery operating condition, and the corresponding relationship; determining the chemical reaction heat according to the current temperature, the current value, and the compensation coefficient; determining the chemical reaction heat according to the current temperature, the current value and the compensation coefficient; obtaining a correspondence relationship among SOC value, battery operation condition and compensation coefficient, including: determining the battery internal resistance according to the calibration temperature, the calibration SOC value and the calibration battery operation condition, and determining the calibration Joule heat according to the battery internal resistance; determining the internal energy change heat of the battery according to the battery temperature change curve and the basic parameters of the battery; determining the heat exchange between the battery and the external environment according to the battery temperature change curve and the external environment temperature; determining the chemical reaction heat according to the internal energy change heat, the heat exchange between the battery and the external environment and the Joule heat; determining the calibration compensation coefficient according to the chemical reaction heat, the current value under the battery operation condition and the current temperature of the battery.

8. A battery, characterized by The battery heat generation amount calculation method comprises a memory, a processor and a battery heat generation amount calculation program stored in the memory and executable on the processor, and the processor executes the battery heat generation amount calculation program to implement the battery heat generation amount calculation method according to any one of claims 1-6.

9. A vehicle characterized by comprising: The battery according to claim 8.

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