Energy state value determination system, method and device, vehicle, medium and product

Abstract

The invention discloses a battery energy state value determination system and method, an electronic device, a vehicle, a computer readable storage medium and a computer program product. The determination system comprises an operation simulation circuit and a processing module, and the operation simulation circuit is configured to determine the energy change of the battery in a preset time period according to the battery current and the battery voltage of the battery; the processing module is configured to determine a current battery energy state value of the battery based on the energy change. According to the determination system, the energy change of the battery in the preset time is determined through the operation simulation circuit according to the battery current and the battery voltage, and then the energy state value of the battery is determined through the processing module according to the energy change, so that consumption of computing resources of the processing module is reduced; and the energy state value can be calculated without using a component with relatively high calculation capability as a processing module, so that the system cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and more particularly, to a system and method for determining a battery energy state value, an electronic device, a vehicle, a computer-readable storage medium, and a computer program product. Background Art

[0002] With the rapid development of electric vehicles and renewable energy, the performance and state monitoring of power batteries have become increasingly important. As one of the important parameters of the power battery state, the battery SOE (State of Energy) can directly reflect the remaining energy of the battery. In the related art, the consumption of computing resources and power consumption during the measurement of SOE are relatively large, increasing the cost and complexity of the system. Summary of the Invention

[0003] The present application provides a system and method for determining a battery energy state value, an electronic device, a vehicle, a computer-readable storage medium, and a computer program product.

[0004] An embodiment of the present application provides a system for determining a battery energy state value, the determining system includes:

[0005] An operation simulation circuit configured to determine an energy change of the battery within a preset time period according to a battery current and a battery voltage of the battery;

[0006] A processing module configured to determine a current battery energy state value of the battery according to the energy change.

[0007] In this way, by using the operation simulation circuit to determine the energy change of the battery within a preset time according to the battery current and battery voltage, and then using the processing module to determine the battery energy state value according to the energy change, the consumption of computing resources of the processing module is reduced, and the calculation of the energy state value can be realized without using high-computing-capability components as the processing module, reducing the system cost.

[0008] In some embodiments, the operation simulation circuit includes:

[0009] A current-voltage conversion sub-circuit configured to determine a first voltage according to the battery current;

[0010] A multiplication operation sub-circuit connected to the current-voltage conversion sub-circuit and configured to determine a battery power according to the first voltage and the battery voltage;

[0011] An integration operation sub-circuit connected to the multiplication operation sub-circuit and configured to determine the energy change according to the battery power.

[0012] In some embodiments, the current-voltage conversion sub-circuit includes a first operational amplifier and a first resistor; wherein,

[0013] The battery current is input to the inverting input terminal of the first operational amplifier, the non-inverting input terminal of the first operational amplifier is grounded, the first end of the first resistor is connected to the inverting input terminal of the first operational amplifier, and the output terminal of the first operational amplifier is connected to the multiplication operation sub-circuit and the second end of the first resistor.

[0014] In some embodiments, the multiplication operation sub-circuit includes:

[0015] A first logarithmic operation unit configured to perform a logarithmic operation based on the first voltage to obtain a second logarithmic voltage;

[0016] A second logarithmic operation unit configured to perform a logarithmic operation based on the battery voltage to obtain a first logarithmic voltage;

[0017] An addition operation unit configured to perform an addition operation on the first logarithmic voltage and the second logarithmic voltage to obtain a second voltage, and the output terminals of the first logarithmic operation unit and the second logarithmic operation unit are connected to the input terminal of the addition operation unit;

[0018] An exponential operation unit configured to perform an exponential operation on the second voltage to obtain the battery power, and the output terminal of the addition operation unit is connected to the input terminal of the exponential operation unit.

[0019] In some embodiments, the first logarithmic operation unit and the second logarithmic operation unit include a logarithmic operation circuit structure, and the logarithmic operation circuit structure includes a second operational amplifier, a first triode, a second resistor, and a third resistor; wherein,

[0020] The inverting input terminal of the second operational amplifier is configured to input a target voltage through the second resistor, the non-inverting input terminal of the second operational amplifier is grounded through the third resistor, the control electrode of the first triode is grounded, the first pole of the first triode is connected to the inverting input terminal of the second operational amplifier, the second pole of the first triode is connected to the output terminal of the second operational amplifier, the target voltage includes the battery voltage and the first voltage, and the output terminal is configured to output the first logarithmic voltage or the second logarithmic voltage.

[0021] In some embodiments, the addition operation unit includes a third operational amplifier, a fourth resistor, and a fifth resistor; wherein,

[0022] The inverting input terminal of the third operational amplifier is connected to the output terminal of the first logarithmic operation unit, the output terminal of the second logarithmic operation unit, and the first terminal of the fourth resistor. The non-inverting input terminal of the third operational amplifier is grounded through the fifth resistor. The output terminal of the third operational amplifier is connected to the second terminal of the fourth resistor and the exponential operation unit. The output terminal of the third operational amplifier is configured to output the second voltage.

[0023] In some embodiments, the exponential operation unit includes a fourth operational amplifier, a second triode, a sixth resistor, and a seventh resistor; wherein,

[0024] The control electrode and the first electrode of the second triode are connected to the output terminal of the addition operation unit. The second stage of the second triode and the sixth resistor are connected to the inverting input terminal of the fourth operational amplifier. The non-inverting input terminal of the fourth operational amplifier is grounded through the seventh resistor. The output terminal of the fourth operational amplifier is connected to the integration operation sub-circuit.

[0025] In some embodiments, the integration operation sub-circuit includes a fifth operational amplifier, an eighth resistor, a ninth resistor, a tenth resistor, and a first capacitor; wherein,

[0026] The inverting input terminal of the fifth operational amplifier is connected to the multiplication operation sub-circuit through the eighth resistor. The non-inverting input terminal of the fifth operational amplifier is grounded through the ninth resistor. The first terminal of the tenth resistor and the first terminal of the first capacitor are connected to the inverting input terminal of the fifth operational amplifier. The second terminal of the tenth resistor and the second terminal of the first capacitor are connected to the output terminal of the fifth operational amplifier.

[0027] In some embodiments, the processing module includes an analog-to-digital converter and a control unit; wherein,

[0028] The analog-to-digital converter is configured to convert an analog signal for characterizing the energy change into a digital signal; the control unit is configured to determine the battery energy state value according to the digital signal.

[0029] In some embodiments, the processing module is further configured to: determine an energy difference according to the energy change and the total energy capacity of the battery; and determine the battery energy state value at the current moment according to the battery energy state value at the previous moment of the battery and the energy difference; wherein, the time interval length between the current moment and the previous moment is the preset duration.

[0030] The embodiments of the present application provide a method for determining a battery energy state value. The determination method is based on the determination system according to any one of the above embodiments. The determination method includes:

[0031] Obtain the energy change of the battery within a preset time period, where the energy change is determined based on an operational simulation circuit according to the battery current and battery voltage of the battery;

[0032] Determine the battery energy state value according to the energy change.

[0033] An embodiment of the present application provides an electronic device, which includes one or more processors and a memory. The memory stores a computer program. When the computer program is executed by the processor, the steps of the method according to any of the above embodiments are implemented.

[0034] An embodiment of the present application provides a vehicle, which includes the electronic device according to the above embodiment.

[0035] An embodiment of the present application provides a computer-readable storage medium, on which a computer program is stored. When the program is executed by a processor, the steps of the method according to any of the above embodiments are implemented.

[0036] An embodiment of the present application provides a computer program product, including a computer program. When the computer program is executed by a processor, the steps according to any of the above embodiments are implemented.

[0037] The additional aspects and advantages of the present application will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present application. Description of the Drawings

[0038] The above and / or additional aspects and advantages of the present application will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0039] Figure 1 is a schematic diagram of a determination system according to some embodiments of the present application;

[0040] Figure 2 is a circuit schematic diagram of an operational simulation circuit according to some embodiments of the present application;

[0041] Figure 3 is a schematic diagram of an operational simulation circuit according to some embodiments of the present application;

[0042] Figure 4 is a schematic flowchart of a determination method according to some embodiments of the present application;

[0043] Figure 5 is a schematic diagram of the SOE measurement value and the actual SOE value obtained by the determination method according to some embodiments of the present application. Detailed Embodiments

[0044] Embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where 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 by referring to the accompanying drawings are exemplary only for explaining the present application and should not be construed as limiting the present application.

[0045] With the rapid development of electric vehicles and renewable energy, the performance and state monitoring of power batteries have become increasingly important. As one of the important parameters of the power battery state, the battery SOE (State of Energy) can directly reflect the remaining energy of the battery. In the related art, the consumption of computing resources and power consumption during the measurement of SOE are relatively large, increasing the cost and complexity of the system.

[0046] Please refer to Figure 1 , an embodiment of the present application provides a determination system 100 for the battery energy state value. The determination system 100 includes an operational simulation circuit 10 and a processing module 20. Among them, the operational simulation circuit 10 is configured to determine the energy change of the battery 200 within a preset time period according to the battery current and battery voltage of the battery 200; the processing module 20 is configured to determine the current battery energy state value of the battery 200 according to the energy change.

[0047] Specifically, the operational simulation circuit 10 is an analog circuit composed of multiple components, which can be used to perform operations on the collected battery current and battery voltage of the battery 200. According to the battery voltage and battery current, the power of the battery 200 at a certain moment can be determined, and according to the power of the battery 200 within the preset time period, the energy change of the battery 200 within the preset time period can be determined.

[0048] Among them, the battery 200 can be a lithium battery, a sodium battery, etc. The battery 200 can also be a power battery of a vehicle, an energy storage battery, a household battery, etc. When the battery 200 is a battery pack or a battery module, the battery current refers to the total current of the battery pack or the battery module, and the battery voltage refers to the total voltage of the battery pack or the battery module.

[0049] The preset time period is a preset time value, which can be set according to requirements and is not limited here. The time interval between any two calculations of the current battery energy state value (SOE) is the preset time period.

[0050] The processing module 20 includes a conversion unit and a control unit. Since the energy output by the analog circuit is transformed into an analog signal form, in order to facilitate further arithmetic processing subsequently, it is necessary to convert the analog signal used to characterize the energy change into a digital signal. Therefore, a conversion unit needs to be set up to achieve analog-to-digital conversion. Among them, the conversion unit can be an analog-to-digital converter (Analog state of energy, ADC).

[0051] The control unit can be used to determine the current state of charge (SOE) value of the battery 200 according to the converted digital signal, so as to determine the battery SOE of the battery 200 at the current moment.

[0052] In the related art, since it is necessary to sample the voltage and current of the battery 200 at a high frequency, and a high sampling rate means that a large amount of analog signal data needs to be processed, which will increase the conversion rate requirement of the ADC, resulting in a relatively high performance requirement for the analog-to-digital converter 21 (ADC) module, thus leading to a relatively high cost of the system. If the sampling rate is reduced considering the performance of the ADC, the conversion rate will be reduced, which will affect the measurement speed and accuracy of the SOE. That is to say, a lower sampling rate may lead to inaccurate results of the SOE measurement, especially when the working conditions of the battery 200 change rapidly. In this case, the system may not be able to track the actual remaining energy of the battery 200 in a timely and accurate manner, thus affecting the accurate monitoring of the state of the battery 200 by the battery 200 management system.

[0053] In addition, most of the data needs to be processed by digital algorithms in the microcontroller unit 22 (MCU), which will increase the computing burden of the MCU. A high-load MCU may not be able to process all the data in a timely manner, resulting in a slow measurement speed of the SOE or even a delay. Further, the high load will also affect the stability and reliability of the system, and may cause the system to crash or malfunction. In summary, there are balance problems between the sampling rate and the conversion rate when measuring the battery SOE in the related art, as well as the challenge of excessive computing load of the MCU. These disadvantages limit the efficiency, accuracy and stability of the SOE measurement, increase the cost and complexity of the system, and need to be further improved and optimized to improve the performance and reliability of the battery 200 management system.

[0054] In the embodiment of the present application, an arithmetic analog circuit 10 is constructed before the processing module 20 to perform arithmetic operations on the voltage and current of the battery 200 by using an analog circuit, so that it is not necessary to transmit the battery voltage and battery current to the ADC for conversion and calculation, which is beneficial to efficiently obtain the SOE state data, and avoids the need to input a large number of analog signals such as voltage and current into the ADC for conversion, as well as the need for calculation and processing in the MCU. It reduces the burden on the ADC and the MCU, and reduces the bandwidth requirement for data interaction.

[0055] In one embodiment, the battery current and the battery voltage are multiplied by the multiplication unit of the operational simulation circuit 10 to obtain the real-time power. Then, the real-time power is integrated by the alternating integration operator circuit 13 to obtain the energy change of the battery 200 within a preset time period Δt, and ΔSOE is obtained after normalization.

[0056] The relationship among the current energy state SOE(t+Δt) of the battery 200, the energy change ΔE, and the energy state SOE(t) of the battery 200 at the previous moment is as follows:

[0057]

[0058] where E nom is the total energy capacity of the battery 200.

[0059] In this way, the operational simulation circuit 10 determines the energy change of the battery 200 within a preset time according to the battery current and the battery voltage, and then the processing module 20 determines the battery energy state value according to the energy change, reducing the consumption of computing resources of the processing module 20. The calculation of the energy state value can be realized without using high-computation-capability components as the processing module 20, reducing the system cost.

[0060] Please refer to Figure 2 , in some embodiments, the operational simulation circuit 10 includes a current-voltage conversion sub-circuit 11, a multiplication sub-circuit 12, and an integration sub-circuit 13. The current-voltage conversion sub-circuit 11 is configured to determine a first voltage according to the battery current; the multiplication sub-circuit 12 is connected to the current-voltage conversion sub-circuit 11 and is configured to determine the power of the battery 200 according to the first voltage and the battery voltage; the integration sub-circuit 13 is connected to the multiplication sub-circuit 12 and is configured to determine the energy change according to the power of the battery 200.

[0061] Specifically, the input end of the current-voltage conversion sub-circuit 11 is used to input the battery current, the output end of the current-voltage conversion sub-circuit 11 is connected to the first input end of the multiplication sub-circuit 12, the output end of the multiplication sub-circuit 12 is connected to the input end of the integration sub-circuit 13, and the output end of the integration sub-circuit 13 is connected to the processing module 20.

[0062] After the current-voltage conversion sub-circuit 11 inputs the battery current and converts the battery current into a first voltage, it outputs the voltage to the multiplication operation sub-circuit 12. The first input terminal of the multiplication operation sub-circuit 12 inputs the first voltage, and the second input terminal of the multiplication operation sub-circuit 12 inputs the battery voltage. The multiplication operation sub-circuit 12 performs a multiplication operation on the first voltage and the battery voltage to obtain the power of the battery 200, and outputs the power to the integration operation sub-circuit 13. The input terminal of the integration operation sub-circuit 13 inputs the power of the battery 200 and performs an integration operation on it to obtain an analog signal that can characterize the energy change.

[0063] In one embodiment, the input voltage range of the multiplication operation sub-circuit 12 is 0 to 3.3V, and the output impedance is 100Ω.

[0064] In this way, through the current-voltage conversion sub-circuit 11, the multiplication operation sub-circuit 12, and the integration operation sub-circuit 13, the conversion of the battery current to the first voltage, the multiplication operation of the first voltage and the battery voltage, and the integration operation of the power of the battery 200 can be realized, so as to realize the determination of the energy change of the battery 200. Using an analog circuit to implement functions such as conversion, multiplication operation, and integration operation eliminates the need to transmit the battery current and the battery voltage to the conversion unit in the processing module 20, reducing the loan requirements and transmission time of data interaction.

[0065] Please refer to Figure 2 , in some embodiments, the current-voltage conversion sub-circuit 11 includes a first operational amplifier and a first resistor; wherein, the inverting input terminal of the first operational amplifier inputs the battery current, the non-inverting input terminal of the first operational amplifier is grounded, the first end of the first resistor is connected to the inverting input terminal of the first operational amplifier, and the output terminal of the first operational amplifier is connected to the multiplication operation sub-circuit 12 and the second end of the first resistor.

[0066] Specifically, the inverting input terminal of the first operational amplifier U1 is the input terminal of the current-voltage conversion sub-circuit 11 for inputting the battery current. The non-inverting input terminal of the first operational amplifier U1 is grounded. The first end of the first resistor R1 is connected to the inverting input terminal of the first operational amplifier U1, and the second end of the first resistor R1 is connected to the output terminal of the first operational amplifier U1.

[0067] The output terminal of the first operational amplifier U1 is the output terminal of the current-voltage conversion sub-circuit 11, which is connected to the first input terminal of the multiplication operation sub-circuit 12 and is used to output the first voltage.

[0068] In one embodiment, after being processed by the current-voltage conversion sub-circuit 11, the battery current I 1 and the first voltage V 1 have the following conversion relationship:

[0069] V 1 =-Rf ·I 1

[0070] wherein, R f is determined according to the resistance value of the first resistor R1.

[0071] In this way, through the first operational amplifier and the first resistor, the battery current can be converted into a first voltage, realizing the conversion of current to voltage, so as to facilitate subsequent further multiplication operation and integration operation.

[0072] Please refer to Figure 2 , in some embodiments, the multiplication operation sub-circuit 12 includes:

[0073] The first logarithmic operation unit 121, which is configured to perform a logarithmic operation according to the first voltage to obtain a second logarithmic voltage;

[0074] The second logarithmic operation unit 122, which is configured to perform a logarithmic operation according to the battery voltage to obtain a first logarithmic voltage;

[0075] The addition operation unit 123, which is configured to perform an addition operation on the first logarithmic voltage and the second logarithmic voltage to obtain a second voltage. The output terminals of the first logarithmic operation unit 121 and the second logarithmic operation unit 122 are connected to the input terminals of the addition operation unit 123;

[0076] The exponential operation unit 124, which is configured to perform an exponential operation on the second voltage to obtain the power of the battery 200. The output terminal of the addition operation unit 123 is connected to the input terminal of the exponential operation unit 124.

[0077] Specifically, the multiplication operation can be realized by sequential logarithmic operation, addition operation and exponential operation. Therefore, the multiplication operation sub-circuit 12 can be realized by the logarithmic operation unit, the addition operation unit 123 and the exponential operation unit 124. Among them, since it is necessary to perform logarithmic operations on the first voltage B 1 and the battery voltage V 2 respectively, therefore, the logarithmic operation unit includes a first operation unit and a second operation unit to convert the first voltage V 1 into a first logarithmic voltage V 3 , and convert the battery voltage V 2 into a second logarithmic voltage V 4 .

[0078] After obtaining the logarithmic-form first logarithmic voltage V 3 and the second logarithmic voltage V 4 , then through the addition operation unit 123, the first logarithmic voltage V 3and a second pair of logarithmic voltages V 4 are subjected to an addition operation to obtain a second voltage V 5 . The second voltage V 5 is also in logarithmic form. To obtain the product result of the first voltage and the battery voltage, the exponential operation unit 124 performs an exponential operation on the second voltage V 5 to obtain the power Vo of the battery 200. The power Vo of the battery 200 can be used to characterize the real-time power of the battery 200.

[0079] In one embodiment, the relationship between the first logarithmic voltage and the first voltage, and the relationship between the second logarithmic voltage and the battery voltage are:

[0080]

[0081] where I s is the reverse saturation current of the emitter junction of the triode in the first logarithmic operation unit 121 and the second logarithmic operation unit 122, and U T is the temperature voltage equivalent. At room temperature, U T is 26 mV.

[0082] The relationship between the second voltage and the first logarithmic voltage and the second logarithmic voltage is:

[0083]

[0084] The relationship between the power Uo of the battery 200 and the second voltage is:

[0085]

[0086] where R is determined according to the resistance values of the resistors in each analog circuit.

[0087] In another embodiment, please refer to Figure 3 . The battery current I1 of the power battery is collected and input to the current-voltage conversion sub-circuit 11 to output V1. At the same time, the battery voltage V2 of the power battery is collected. V1 is input to the first logarithmic operation unit 121 to calculate the first logarithmic voltage V3, and V2 is input to the second logarithmic operation unit 122 to calculate the second logarithmic voltage V4. Then, the first logarithmic voltage V3 and the second logarithmic voltage V4 are respectively input to the summation operation circuit to calculate the second voltage V5. The second voltage V5 is input to the exponential operation unit 124 to calculate the power Vo of the battery 200, and the power Vo of the battery 200 is input to the integration operation sub-circuit 13 to calculate the energy change amount ΔE. Among them, the energy change amount ΔE is used to characterize the energy change of the battery 200 and is an analog signal.

[0088] Thus, the multiplication operation of the first voltage and the battery voltage can be achieved through the logarithmic operation unit, the addition operation unit 123, and the exponential operation unit 124.

[0089] In some embodiments, the first logarithmic operation unit 121 and the second logarithmic operation unit 122 include a logarithmic operation circuit structure, and the logarithmic operation circuit structure includes a second operational amplifier, a first triode, a second resistor, and a third resistor; wherein,

[0090] The inverting input terminal of the second operational amplifier is configured to input a target voltage through the second resistor, the non-inverting input terminal of the second operational amplifier is grounded through the third resistor, the control electrode of the first triode is grounded, the first pole of the first triode is connected to the inverting input terminal of the second operational amplifier, the second pole of the first triode is connected to the output terminal of the second operational amplifier, the target voltage includes the battery voltage and the first voltage, and the output terminal is configured to output a first logarithmic voltage or a second logarithmic voltage.

[0091] Specifically, the circuit structures of the first logarithmic operation unit 121 and the second logarithmic operation unit 122 may be the same. For example, both the first logarithmic operation unit 121 and the second logarithmic operation unit 122 may include a logarithmic operation circuit structure. The logarithmic operation circuit structure can achieve the logarithmic operation of the input voltage.

[0092] Among them, the logarithmic operation circuit structure includes a second operational amplifier, a first triode, a second resistor, a third resistor, and an output resistor. The first end of the second resistor is the input terminal of the logarithmic operation circuit structure, and the second end of the second resistor and the collector of the first triode are connected to the inverting input terminal of the second operational amplifier. The non-inverting input terminal of the second operational amplifier is connected to the first end of the third resistor, and the second end of the third resistor is grounded. The output terminal of the second operational amplifier is connected to the second end of the first triode, the output resistor, and outputs a first logarithmic voltage or a second logarithmic voltage through the output resistor.

[0093] The first triode can be NPN, PNP, etc. In this embodiment, the first triode is an NPN-type triode for illustration.

[0094] The input terminal of the logarithmic operation circuit structure inputs a target voltage and outputs a logarithmic voltage. When the target voltage is the first voltage, the logarithmic operation circuit structure outputs a first logarithmic voltage. When the target voltage is the battery voltage, the logarithmic operation circuit structure outputs a second logarithmic voltage.

[0095] In one embodiment, the first logarithmic operation unit 121 includes a second operational amplifier U2, a second resistor R2, a third resistor R3, an output resistor R4, and a first triode Q1. The inverting input terminal of the second operational amplifier U2 inputs a first voltage through the second resistor R2. The non-inverting input terminal of the second operational amplifier U2 is grounded through the third resistor R3. The output terminal of the second operational amplifier U2 outputs a first logarithmic voltage through the output resistor R4. The control electrode of the first triode Q1 is grounded. The collector of the first triode Q1 is connected to the inverting input terminal of the second operational amplifier U2. The emitter of the first triode Q1 is connected to the output terminal of the second operational amplifier U2.

[0096] The second logarithmic operation unit 122 includes a second operational amplifier U3, a second resistor R5, a third resistor R6, an output resistor R7, and a first triode Q2. The inverting input terminal of the second operational amplifier U3 inputs a first voltage through the second resistor R5. The non-inverting input terminal of the second operational amplifier U3 is grounded through the third resistor R6. The output terminal of the second operational amplifier U3 outputs a first logarithmic voltage through the output resistor R7. The control electrode of the first triode Q2 is grounded. The collector of the first triode Q2 is connected to the inverting input terminal of the second operational amplifier U3. The emitter of the first triode Q2 is connected to the output terminal of the second operational amplifier U3.

[0097] Thus, through the connection of the second operational amplifier, the first triode, and multiple resistors in the logarithmic operation circuit structure, the logarithmic operation of the input target voltage can be achieved to output the first logarithmic voltage or the second logarithmic voltage.

[0098] In some embodiments, the addition operation unit 123 includes a third operational amplifier, a fourth resistor, and a fifth resistor; wherein,

[0099] The inverting input terminal of the third operational amplifier is connected to the output terminal of the first logarithmic operation unit 121, the output terminal of the second logarithmic operation unit 122, and the first end of the fourth resistor. The non-inverting input terminal of the third operational amplifier is grounded through the fifth resistor. The output terminal of the third operational amplifier is connected to the second end of the fourth resistor and the exponential operation unit 124. The output terminal of the third operational amplifier is configured to output a second voltage.

[0100] Specifically, the first logarithmic voltage and the second logarithmic voltage are input to the input terminal of the addition operation unit 123, and the second voltage is output from the output terminal. The inverting input terminal of the third operational amplifier of the addition operation unit 123 is the input terminal of the addition operation unit 123, and the output terminal of the third operational amplifier is the output terminal of the addition operation unit 123.

[0101] The inverting input terminal of the third operational amplifier receives the first logarithmic voltage and the second logarithmic voltage. The non-inverting input terminal of the third operational amplifier is connected to the first end of the fourth resistor, and the second end of the fourth resistor is grounded. The output terminal of the third operational amplifier is configured to output a second voltage. The first end of the fifth resistor is connected to the inverting input terminal of the third operational amplifier, and the second end of the fifth resistor is connected to the non-inverting input terminal of the third operational amplifier.

[0102] In one embodiment, the addition operation unit 123 includes a third operational amplifier U4, a fourth resistor R8, and a fifth resistor R9. The inverting input terminal of the third operational amplifier U4 receives the first logarithmic voltage and the second logarithmic voltage. The non-inverting input terminal of the third operational amplifier U4 is grounded through the fourth resistor R8. The output terminal of the third operational amplifier U4 outputs a second voltage. The two ends of the fifth resistor R9 are respectively connected to the inverting input terminal and the non-inverting input terminal of the third operational amplifier U4.

[0103] Thus, through the connection relationship of the third operational amplifier, the fourth resistor, and the fifth resistor, the addition operation of the first logarithmic voltage and the second logarithmic voltage can be realized.

[0104] In some embodiments, the exponential operation unit 124 includes a fourth operational amplifier, a second triode, a sixth resistor, and a seventh resistor; wherein,

[0105] The control electrode and the first electrode of the second triode are connected to the output terminal of the addition operation unit 123. The second stage of the second triode is connected to the inverting input terminal of the fourth operational amplifier through the sixth resistor. The non-inverting input terminal of the fourth operational amplifier is grounded through the seventh resistor. The output terminal of the fourth operational amplifier is connected to the integration operation sub-circuit 13.

[0106] Specifically, the exponential operation unit 124 can perform an exponential operation on the second voltage to obtain the power of the battery 200. The collector of the second triode of the exponential operation unit 124 is the input terminal of the exponential operation unit 124, and the output terminal of the fourth operational amplifier of the exponential operation unit 124 is the output terminal of the exponential operation unit 124. The second triode can be NPN, PNP, etc. In this embodiment, the second triode is an NPN-type triode for illustration.

[0107] Wherein, the collector of the second triode is connected to the addition operation unit 123, the control electrode is grounded, and the emitter is connected to the inverting input terminal of the fourth operational amplifier. The non-inverting input terminal of the fourth operational amplifier is connected to the first end of the sixth resistor, and the second end of the sixth resistor is grounded. The output terminal of the fourth operational amplifier is connected to the integration operation sub-circuit 13. The first end of the seventh resistor is connected to the inverting input terminal of the fourth operational amplifier, and the second end of the seventh resistor is connected to the output terminal of the fourth operational amplifier.

[0108] In one embodiment, the collector of the second triode Q3 of the exponential operation unit 124 is configured to input a second voltage, and the output terminal of the fourth operational amplifier U5 is configured to output the power of the battery 200.

[0109] In this way, through the connection relationship of the fourth operational amplifier U4, the second triode, the sixth resistor, and the seventh resistor, the exponential operation of the second voltage can be realized to complete the multiplication operation of the first voltage and the battery voltage, thereby completing the multiplication operation of the battery current and the battery voltage to obtain the power of the battery 200.

[0110] In some embodiments, the integration operation sub-circuit 13 includes a fifth operational amplifier, an eighth resistor, a ninth resistor, a tenth resistor, and a first capacitor; wherein,

[0111] The inverting input terminal of the fifth operational amplifier is connected to the multiplication operation sub-circuit 12 through the eighth resistor, the non-inverting input terminal of the fifth operational amplifier is grounded through the ninth resistor, the first end of the tenth resistor and the first end of the first capacitor are connected to the inverting input terminal of the fifth operational amplifier, and the second end of the tenth resistor and the second end of the first capacitor are connected to the output terminal of the fifth operational amplifier.

[0112] Specifically, the integration operation sub-circuit 13 is configured to integrate the power of the battery 200 within a preset time period to obtain the energy change of the battery 200 within the preset time period. Among them, since the energy change of the battery 200 is determined based on the integration operation sub-circuit 13, the representation form of the energy change of the battery 200 is the analog signal output by the integration operation sub-circuit 13.

[0113] The first end of the eighth resistor of the integration operation sub-circuit 13 is configured to input the power of the battery 200, and the output terminal of the fifth operational amplifier is configured to output an analog signal for characterizing the energy change. Specifically, the first end of the eighth resistor is the input terminal of the integration operation sub-circuit 13, the second end of the eighth resistor is connected to the inverting input terminal of the fifth operational amplifier, the non-inverting input terminal of the fifth operational amplifier is connected to the first end of the ninth resistor, and the second end of the ninth resistor is grounded. The first capacitor and the tenth resistor are in parallel, and the first end of the first capacitor and the first end of the tenth resistor are connected to the inverting input terminal of the fifth operational amplifier, and the second end of the first capacitor and the second end of the tenth resistor are connected to the output terminal of the fifth operational amplifier. The output terminal of the fifth operational amplifier outputs an analog signal.

[0114] In one embodiment, the integrator circuit 13 includes a fifth operational amplifier U6, an eighth resistor R12, a ninth resistor R13, a tenth resistor R14, and a first capacitor C1. The inverting input terminal of the fifth operational amplifier U6 inputs the power of the battery 200 through the eighth resistor R12, and the non-inverting input terminal of the fifth operational amplifier U6 is grounded through the ninth resistor R13. The tenth resistor R14 and the first capacitor C1 are connected in parallel, and are connected in parallel between the inverting input terminal and the output terminal of the fifth operational amplifier U6. The output terminal of the fifth operational amplifier U6 is grounded through a first output resistor R15.

[0115] The specific parameters of the above components can be set according to the actual situation to meet the functions of the operational simulation circuit, and are not limited here. For example, the resistance value of the tenth resistor R14 can be 10 kΩ, and the capacitance value of the first capacitor C1 can be 100 nF to match the impedance and reduce noise. Another example is that the gain-bandwidth product GBW of the above operational amplifier is approximately 10 MHz, and the input offset voltage Vos is approximately 25 μV.

[0116] In another embodiment, the relationship between the power V of the battery 200 O and the energy change ΔE is:

[0117]

[0118] where C is the first capacitor, and R f C is the integration time constant, and R is determined according to the eighth resistor R12, the ninth resistor R13, and the tenth resistor R14.

[0119] It should be noted that the current-voltage conversion sub-circuit 11, the multiplication operator circuit 12, and the integrator circuit 13 of the embodiments of the present application are not limited to the above circuit structures, and can also be other circuit structures capable of realizing the corresponding circuit functions, which are not limited here.

[0120] In this way, by connecting the fifth operational amplifier, the eighth resistor, the ninth resistor, the tenth resistor, and the first capacitor to form the integrator circuit 13, the integration operation of the battery 200 power can be realized, and the energy change of the battery 200 can be obtained.

[0121] In some embodiments, the processing module 20 includes an analog-to-digital converter 21 and a control unit; wherein,

[0122] The analog-to-digital converter 21 is configured to convert an analog signal used to characterize the energy change into a digital signal; the control unit is configured to determine the battery energy state value according to the digital signal.

[0123] Specifically, an analog-to-digital converter 21 (ADC) can be used to convert an analog signal into a digital signal. Since the signal representing the energy change of the battery 200 output by the analog circuit is an analog signal, in order to enable the analog signal to participate in further calculations in the control unit, analog-to-digital conversion is required to obtain a digital signal. Therefore, an ADC is set up to complete the analog-to-digital conversion.

[0124] The control unit includes a microcontroller unit 22 (MCU), which is used to determine the current energy state of the battery 200 according to the digital signal and the energy state of the previous battery 200 calculated at the previous moment.

[0125] Furthermore, the energy change of the battery 200 may be a decrease or an increase in energy. That is to say, the currently calculated current state of charge (SOE) may be smaller or larger than the SOE at the previous moment. If the energy change calculated by the hardware circuit is a positive value, the MCU needs to determine the charge and discharge state of the current battery 200 by itself, so as to determine the specific method for determining the current SOE of the battery 200 according to the energy change.

[0126] In the embodiment of the present application, before ADC sampling, based on the voltage and current output signals of the battery 200 system to be estimated and their physical relationship with the state quantity to be estimated, i.e., the state of charge (SOE), a multiplication operation unit and an integration operation unit in the form of an analog circuit are constructed. By implementing the multiplication operation of current and voltage and power integration in the form of an analog circuit to measure the energy change of the battery 200, the amount of data that needs to be input and processed by the ADC is reduced, and the performance requirements for the ADC are decreased. The analog signal of the energy change that has been calculated and processed is then input into the ADC. After the ADC performs analog-to-digital conversion to obtain a digital signal, it is output to the control unit to further calculate the SOE of the battery 200.

[0127] In this way, by setting up a high-speed and low-power analog circuit, the requirements for efficient SOE measurement are met, so that it is possible to achieve efficient measurement of the battery SOE without using a high-performance mode converter and control unit. At the same time, by using a dedicated analog circuit to measure the SOE, the burden on the control unit can be reduced, enabling the control unit to be better applied to other functions and tasks.

[0128] In some embodiments, the processing module 20 is further configured to: determine an energy difference according to the energy change and the total energy capacity of the battery 200; and determine the current battery energy state value of the battery 200 at the current moment according to the battery energy state value of the battery 200 at the previous moment and the energy difference; wherein the time interval length between the current moment and the previous moment is a preset duration.

[0129] Specifically, the MCU can be used to determine the battery energy state value of the battery 200 at the current moment.

[0130] In one embodiment, when the battery 200 is in the charging state, the relationship between the current battery 200 energy state SOE(t + Δt) and the battery 200 energy state SOE(t) at the previous moment is:

[0131]

[0132] When the battery 200 is in the discharging state, the relationship between the current battery 200 energy state SOE(t + Δt) and the battery 200 energy state SOE(t) at the previous moment is:

[0133]

[0134] Among them, E nom is the total battery energy capacity of the battery 200, V(t) and i(t) are the voltage and current collected in real time by the power battery respectively, and the rightmost integral term is ΔSOE.

[0135] Please refer to Figure 4 , the embodiment of the present application provides a method for determining the battery energy state value. The determination method is based on the determination system 100 according to any of the above embodiments. The determination method includes:

[0136] 01: Obtain the energy change of the battery 200 within a preset duration. The energy change is determined based on the operational simulation circuit 10 according to the battery current and battery voltage of the battery 200;

[0137] 02: Determine the battery energy state value according to the energy change.

[0138] Please refer to Figure 5 , it can be seen that the SOE measurement value measured by using the SOE determination method and the determination system 100 of the embodiment of the present application has a small deviation from the actual SOE value. That is to say, the determination method and the determination system 100 of the embodiment of the present application can achieve accurate estimation of the battery SOE value in a noisy environment.

[0139] The embodiment of the present application provides an electronic device. The electronic device includes one or more processors and a memory. When the computer program stored in the memory is executed by the processor, the steps of the method according to any of the above embodiments are implemented.

[0140] The embodiment of the present application provides a determination device. The determination device includes an acquisition module and a determination module. Among them, the acquisition module can be used to acquire the energy change of the battery 200 within a preset duration; the determination module can be used to determine the battery energy state value according to the energy change.

[0141] The above explanation of the determination system 100 of the embodiments of the present application is equally applicable to the determination method of the embodiments of the present application, and will not be repeated here.

[0142] An embodiment of the present application provides a vehicle, which includes an electronic device as described in the above embodiment.

[0143] An embodiment of the present application provides a computer-readable storage medium, on which a computer program is stored. When the program is executed by a processor, the steps of the method according to any of the above embodiments are implemented.

[0144] An embodiment of the present application provides a computer program product, which includes a computer program. When the computer program is executed by a processor, the steps according to any of the above embodiments are implemented.

[0145] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples" or "some examples", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. In addition, without conflict, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0146] In addition, the term "connection" should be understood in a broad sense. For example, it may include a fixed connection, a detachable connection, or an integral connection; it may include a direct connection, an indirect connection through an intermediate medium, or a communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to specific circumstances.

[0147] In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0148] Any process or method description, whether in a flowchart or otherwise described herein, can be understood to represent a module, segment, or portion of code including one or more executable instructions for implementing a specific logical function or process. The scope of the preferred embodiments of the present application includes additional implementations, where the functions may be executed in a substantially simultaneous manner or in the reverse order according to the functions involved, rather than in the order shown or discussed. This should be understood by those skilled in the art to which the embodiments of the present application pertain.

[0149] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A system for determining a battery energy status value, characterized in that: The determination system comprises: an operation simulation circuit, wherein the operation simulation circuit is configured to determine an energy change of the battery within a preset time period according to a battery current and a battery voltage of the battery; A processing module is configured to determine a current battery energy state value of the battery according to the energy change.

2. The determination system according to claim 1, characterized in that The operational simulation circuit comprises: a current-to-voltage conversion subcircuit, the current-to-voltage conversion subcircuit being configured to determine a first voltage according to the battery current; a multiplication operation subcircuit, the multiplication operation subcircuit being connected to the current-voltage conversion subcircuit and configured to determine a battery power according to the first voltage and the battery voltage; An integral operator circuit is connected to the multiplication operator circuit and is configured to determine the energy change according to the battery power.

3. The determination system according to claim 2, characterized in that: The current-voltage conversion subcircuit includes a first operational amplifier and a first resistor; wherein, The battery current is input to the inverting input terminal of the first operational amplifier, the non-inverting input terminal of the first operational amplifier is grounded, the first end of the first resistor is connected to the inverting input terminal of the first operational amplifier, and the output terminal of the first operational amplifier is connected to the multiplication operator circuit and the second end of the first resistor.

4. The determination system according to claim 2, characterized in that: The multiplication operation subcircuit comprises: a first logarithmic operation unit, wherein the first logarithmic operation unit is configured to perform a logarithmic operation on the first voltage to obtain a second logarithmic voltage; a second logarithmic operation unit, the second logarithmic operation unit being configured to perform a logarithmic operation according to the battery voltage to obtain a first logarithmic voltage; an adding unit, the adding unit being configured to perform an adding operation on the first logarithmic voltage and the second logarithmic voltage to obtain a second voltage, wherein an output terminal of the first logarithmic operating unit and an output terminal of the second logarithmic operating unit are connected to an input terminal of the adding unit; An exponential operation unit is configured to perform an exponential operation on the second voltage to obtain the battery power, and an output end of the addition operation unit is connected to an input end of the exponential operation unit.

5. The determination system according to claim 4, characterized in that: The first logarithmic operation unit and the second logarithmic operation unit include a logarithmic operation circuit structure, and the logarithmic operation circuit structure includes a second operational amplifier, a first transistor, a second resistor and a third resistor; wherein, The inverting input terminal of the second operational amplifier is configured to input a target voltage through the second resistor, the non-inverting input terminal of the second operational amplifier is grounded through the third resistor, the control terminal of the first transistor is grounded, the first terminal of the first transistor is connected to the inverting input terminal of the second operational amplifier, the second terminal of the first transistor is connected to the output terminal of the second operational amplifier, the target voltage includes the battery voltage and the first voltage, and the output terminal is configured to output the first logarithmic voltage or the second logarithmic voltage.

6. The determination system according to claim 4, characterized in that: The adding unit includes a third operational amplifier, a fourth resistor and a fifth resistor; wherein, The inverting input terminal of the third operational amplifier is connected to the output terminal of the first logarithmic operation unit, the output terminal of the second logarithmic operation unit, and the first terminal of the fourth resistor, the non-inverting input terminal of the third operational amplifier is grounded through the fifth resistor, the output terminal of the third operational amplifier is connected to the second terminal of the fourth resistor and the exponential operation unit, and the output terminal of the third operational amplifier is configured to output the second voltage.

7. The determination system according to claim 4, characterized in that: The exponential operation unit includes a fourth operational amplifier, a second triode, a sixth resistor and a seventh resistor; wherein, The control electrode and the first electrode of the second transistor are connected to the output end of the addition operation unit, the second stage of the second transistor and the sixth resistor are connected to the inverting input end of the fourth operational amplifier, the non-inverting input end of the fourth operational amplifier is grounded through the seventh resistor, and the output end of the fourth operational amplifier is connected to the integration operator circuit.

8. The determination system according to claim 2, characterized in that: The integral operation subcircuit includes a fifth operational amplifier, an eighth resistor, a ninth resistor, a tenth resistor and a first capacitor; wherein, The inverting input terminal of the fifth operational amplifier is connected to the multiplication operator circuit through the eighth resistor, the non-inverting input terminal of the fifth operational amplifier is grounded through the ninth resistor, the tenth resistor and the first end and the first end of the first capacitor are connected to the inverting input terminal of the fifth operational amplifier, and the tenth resistor and the second end and the second end of the first capacitor are connected to the output terminal of the fifth operational amplifier.

9. The determination system according to claim 1, characterized in that: The processing module includes an analog-to-digital converter and a control unit; wherein, The analog-to-digital converter is configured to convert an analog signal used to characterize the energy change into a digital signal; and the control unit is configured to determine the battery energy status value according to the digital signal.

10. The determination system according to any one of claims 1 to 9, characterized in that: The processing module is further configured to: determine an energy difference value according to the energy change and the total energy capacity of the battery; And, based on the battery energy status value of the battery at the previous moment and the energy difference value, determine the current battery energy status value of the battery at the current moment; wherein the time interval length between the current moment and the previous moment is the preset duration.

11. A method for determining a battery energy status value, characterized in that: The determination method is based on the determination system according to any one of claims 1 to 10, and the determination method includes: Acquiring an energy change of a battery within a preset time period, wherein the energy change is determined based on a calculation simulation circuit according to a battery current and a battery voltage of the battery; The battery energy state value is determined according to the energy change.

12. An electronic device, characterized in that: The electronic device comprises one or more processors and a memory, wherein the memory stores a computer program, and when the computer program is executed by the processor, the steps of the method according to claim 11 are implemented.

13. A vehicle, characterized in that: The vehicle comprises the electronic device according to claim 12.

14. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to claim 11 are implemented.

15. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to claim 11 are implemented.

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