Bidirectional charging and discharging system and method for energy storage battery

Abstract

The invention discloses a bidirectional charging and discharging system and method for an energy storage battery, and relates to the technical field of energy storage batteries, and the method comprises the following steps: obtaining a battery model, calculating a battery capacity loss value, setting a charging simulation parameter and a discharging simulation parameter, simulating battery charging and battery discharging, and detecting a first battery temperature and a second battery temperature, setting a first confidence battery temperature and a second confidence battery temperature, respectively matching corresponding charging duration and discharging duration, acquiring a user request, and identifying and executing a first operation. According to the method, the capacity loss value of the battery is accurately calculated, the calculation simplicity is improved, the voltage is continuously regulated and controlled through a control variable method, the simulation scientificity is improved, visual data feedback is provided, a reasonable voltage interval is selected according to the temperature of the battery, and by matching the corresponding charging duration or discharging duration, the battery capacity loss value can be accurately calculated. And the sustainability of the battery and the requirements of a user are met.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage batteries, and in particular to a bidirectional charging and discharging system and method for energy storage batteries. Background Art

[0002] In recent years, energy storage batteries have been widely used in frequency modulation, voltage regulation and frequency regulation of power systems, improving the stability and response speed of power systems, helping to balance the supply and demand of power systems, improving energy utilization efficiency, and supporting the large-scale integration of renewable energy.

[0003] At present, a Chinese invention patent with publication number CN 106848462 B discloses a method for charging and discharging an energy storage battery. The method uses power as a single control variable and does not require switching between a constant current control mode and a constant voltage control mode, thereby simplifying the control of the energy storage inverter. However, the related technology does not regulate the electrical parameters according to the actual temperature range of the battery, which is not conducive to the life and sustainability of the battery, does not take into account the actual needs of users, and lacks applicability and serviceability of the method. Summary of the invention

[0004] The technical problem solved by the present invention is that the related art does not regulate the electrical parameters according to the actual temperature range of the battery, which is not conducive to the life and sustainability of the battery, does not take into account the actual needs of users, and lacks applicability and serviceability of the method.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: In the first aspect, a bidirectional charging and discharging method of an energy storage battery comprises the following steps:

[0006] Step S1, obtaining the battery model and matching the battery related parameters corresponding to the battery model;

[0007] Step S2, calculating the battery capacity loss value according to battery related parameters;

[0008] Step S3, setting charging simulation parameters and discharging simulation parameters, simulating battery charging simulation and battery discharging, detecting the first battery temperature and the second battery temperature, respectively calculating the charging battery capacity loss value and the discharging battery capacity loss value, setting the first confidence battery temperature and the second confidence battery temperature according to the preset capacity loss value upper limit, and matching the corresponding charging time and discharging time respectively;

[0009] Step S4, obtaining a user request, identifying the user request, obtaining an identification result, and performing a first operation according to the identification result.

[0010] As a preferred solution of the bidirectional charging and discharging method of an energy storage battery described in the present invention, step S1 includes the following sub-steps:

[0011] Step S11, obtaining a battery surface image, scanning a QR code in the battery image, connecting to a network, and matching a corresponding battery model according to the QR code;

[0012] Step S12, calling a battery database, inputting the battery model into the battery database, and obtaining battery-related parameters corresponding to the battery model, wherein the battery-related parameters include rated capacity, battery internal resistance, influence coefficient of ambient temperature on battery capacity, influence coefficient of battery temperature on battery capacity, and influence coefficient of battery internal resistance on battery;

[0013] The battery database includes battery model, rated capacity, battery internal resistance, influence coefficient of ambient temperature on battery capacity, influence coefficient of battery temperature on battery capacity and influence coefficient of battery internal resistance on battery.

[0014] As a preferred solution of the bidirectional charging and discharging method of an energy storage battery described in the present invention, step S2 includes the following sub-steps:

[0015] Step S21, obtaining the influence coefficient of the ambient temperature on the battery capacity, the influence coefficient of the battery temperature on the battery capacity and the influence coefficient of the battery internal resistance on the battery, and collecting the ambient temperature, the battery temperature and the battery internal resistance;

[0016] Step S22, calculating the product of the ambient temperature and the influence coefficient of the ambient temperature on the battery capacity, recorded as the first product, calculating the product of the battery temperature and the influence coefficient of the battery temperature on the battery capacity, recorded as the second product, calculating the product of the battery internal resistance and the influence coefficient of the battery internal resistance on the battery, recorded as the third product, calculating the sum of the first product, the second product and the third product, and setting the sum as the battery capacity loss value;

[0017] The calculation expression of the battery capacity loss value is:

[0018] y=c1x1+c2x2+c3x3

[0019] Among them, y is the battery capacity loss value, c1 is the influence coefficient of ambient temperature on battery capacity, c2 is the influence coefficient of battery temperature on battery capacity, c3 is the influence coefficient of battery internal resistance on battery, x1 is ambient temperature, x2 is battery temperature, and x3 is battery internal resistance.

[0020] As a preferred solution of the bidirectional charging and discharging method of an energy storage battery described in the present invention, step S3 includes the following sub-steps:

[0021] Step S31, setting charging simulation parameters and discharging simulation parameters, respectively simulating battery charging and battery discharging, wherein the charging simulation parameters include input voltage and a first battery temperature, and the discharging simulation parameters include output voltage and a second battery temperature, wherein the first battery temperature represents the battery temperature during the battery charging simulation process, and the second battery temperature represents the battery temperature during the battery discharging simulation process, wherein the ambient temperature is set to a first value, and the input voltage and the output voltage are used as variables, and are continuously regulated;

[0022] Step S32, detecting a first battery temperature, a battery internal resistance corresponding to the first battery temperature, a second battery temperature, and a battery internal resistance corresponding to the second battery temperature, calculating a battery capacity loss value according to the first battery temperature, the battery internal resistance corresponding to the first battery temperature, and the first value, and recording it as a charging battery capacity loss value, and calculating a battery capacity loss value according to the second battery temperature, the battery internal resistance corresponding to the second battery temperature, and the first value, and recording it as a discharging battery capacity loss value;

[0023] Step S33, setting the second value as the upper limit of the battery capacity loss value, the second value is distributed between 0 and 0.2, and is represented as the maximum allowable value of the battery capacity loss value, comparing the rechargeable battery capacity loss value with the second value, and obtaining a first comparison result, the first comparison result including the rechargeable battery capacity loss value being less than the second value and the rechargeable battery capacity loss value being greater than or equal to the second value, selecting the input voltage and the first battery temperature corresponding to the rechargeable battery capacity loss value being less than the second value, and recording them as the first confidence voltage and the first confidence battery temperature, respectively;

[0024] Step S34, compare the discharge battery capacity loss value with the second value to obtain a second comparison result, wherein the first comparison result includes that the discharge battery capacity loss value is less than the second value and that the discharge battery capacity loss value is greater than or equal to the second value, and select the output voltage and the second battery temperature corresponding to the discharge battery capacity loss value being less than the second value, and record them as the second confidence voltage and the second confidence battery temperature, respectively.

[0025] As a preferred solution of the bidirectional charging and discharging method of an energy storage battery described in the present invention, step S33 further includes the following sub-steps:

[0026] Step S331, traversing the first confident battery temperatures and sorting the first confident battery temperatures in descending order;

[0027] Step S332, according to the charging durations corresponding to the first confident battery temperature matches after being sorted in descending order, the input voltage corresponding to the charging battery temperature with the largest value is set as the maximum charging voltage, and the input voltage corresponding to the charging battery temperature with the smallest value is set as the minimum charging voltage.

[0028] As a preferred solution of the bidirectional charging and discharging method of an energy storage battery described in the present invention, step S34 further includes the following sub-steps:

[0029] Step S341, traversing the second confident battery temperatures and sorting the second confident battery temperatures in descending order;

[0030] Step S342, according to the discharge durations corresponding to the second confidence battery temperature matches after being sorted in descending order, the output voltage corresponding to the discharge battery temperature with the largest value is set as the maximum discharge voltage, and the input voltage corresponding to the discharge battery temperature with the smallest value is set as the minimum discharge voltage.

[0031] As a preferred solution of the bidirectional charging and discharging method of an energy storage battery described in the present invention, wherein: when the battery is charged, the real-time input voltage is measured, and the real-time input voltage is compared with the maximum charging voltage and the minimum charging voltage. When the real-time input voltage is less than the minimum charging voltage, the difference between the real-time input voltage and the minimum charging voltage is calculated, and an instruction to increase the input voltage is issued. When the real-time input voltage is greater than the maximum charging voltage, the difference between the maximum charging voltage and the implementation input voltage is calculated, and an instruction to reduce the input voltage is issued;

[0032] When the battery is discharging, the real-time output voltage is measured, and the real-time output voltage is compared with the maximum discharge voltage and the minimum discharge voltage. When the real-time output voltage is less than the minimum discharge voltage, the difference between the real-time output voltage and the minimum discharge voltage is calculated, and an instruction to increase the output voltage is issued. When the real-time output voltage is greater than the maximum discharge voltage, the difference between the maximum discharge voltage and the real-time output voltage is calculated, and an instruction to decrease the output voltage is issued.

[0033] As a preferred solution of the bidirectional charging and discharging method of an energy storage battery described in the present invention, step S4 includes the following sub-steps:

[0034] Step S41, setting a first trigger condition, wherein the first trigger condition is a voice signal or a key signal;

[0035] Step S42, identifying the first trigger condition to obtain a first identification result, wherein the first identification result is an operation type request, and the operation type request includes a charging request, a discharging request, or an end request;

[0036] Step S43, performing a first operation according to the first recognition result, wherein the first operation is charging time recognition or discharging time recognition or displaying a completion mark.

[0037] In a second aspect, a bidirectional charging and discharging system for an energy storage battery includes an acquisition module, a calculation module, a simulation module, and an execution module;

[0038] The acquisition module is used to obtain the battery model and match the battery related parameters corresponding to the battery model;

[0039] The calculation module is used to calculate the battery capacity loss value according to the battery related parameters;

[0040] The simulation module is used to set charging simulation parameters and discharging simulation parameters, simulate battery charging simulation and battery discharging, detect the first battery temperature and the second battery temperature, respectively calculate the charging battery capacity loss value and the discharging battery capacity loss value, set the first confidence battery temperature and the second confidence battery temperature according to the preset capacity loss value, and respectively match the corresponding charging time and discharging time;

[0041] The execution module obtains a user request, identifies the user request, obtains an identification result, and executes a first operation according to the identification result.

[0042] The beneficial effects of the present invention are as follows: by accurately calculating the capacity loss value of the battery, the simplicity of the calculation is increased; by continuously adjusting the voltage through the control variable method, the scientific nature of the simulation is increased; and intuitive data feedback is provided. A reasonable voltage range is selected according to the battery temperature, and by matching the corresponding charging time or discharging time, both the sustainability of the battery and the needs of the user are met. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 A schematic diagram of a basic flow chart of a bidirectional charging and discharging method for an energy storage battery provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0044] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings. It is obvious that the described embodiments are only part of the embodiments of the present invention, but not all of the embodiments.

[0045] Example 1, reference Figure 1 , as an embodiment of the present invention, provides a bidirectional charging and discharging method for an energy storage battery, a bidirectional charging and discharging method for an energy storage battery, comprising the following steps:

[0046] Step S1, obtaining the battery model and matching the battery related parameters corresponding to the battery model;

[0047] Step S2, calculating the battery capacity loss value according to battery related parameters;

[0048] Step S3, setting charging simulation parameters and discharging simulation parameters, simulating battery charging simulation and battery discharging, detecting the first battery temperature and the second battery temperature, respectively calculating the charging battery capacity loss value and the discharging battery capacity loss value, setting the first confidence battery temperature and the second confidence battery temperature according to the preset capacity loss value upper limit, and matching the corresponding charging time and discharging time respectively;

[0049] Step S4, obtaining a user request, identifying the user request, obtaining an identification result, and performing a first operation according to the identification result.

[0050] The present invention increases the simplicity of calculation by accurately calculating the capacity loss value of the battery, continuously adjusts the voltage through the control variable method, increases the scientific nature of the simulation, provides intuitive data feedback, selects a reasonable voltage range according to the battery temperature, and matches the corresponding charging time or discharging time, thereby meeting both the sustainability of the battery and the needs of the user.

[0051] The step S1 includes the following sub-steps:

[0052] Step S11, obtaining a battery surface image, scanning a QR code in the battery image, connecting to a network, and matching a corresponding battery model according to the QR code;

[0053] Step S12, calling a battery database, inputting the battery model into the battery database, and obtaining battery-related parameters corresponding to the battery model, wherein the battery-related parameters include rated capacity, battery internal resistance, influence coefficient of ambient temperature on battery capacity, influence coefficient of battery temperature on battery capacity, and influence coefficient of battery internal resistance on battery;

[0054] The battery database includes battery model, rated capacity, battery internal resistance, influence coefficient of ambient temperature on battery capacity, influence coefficient of battery temperature on battery capacity and influence coefficient of battery internal resistance on battery.

[0055] In specific implementation, by obtaining the specific model and related parameters of the battery and accurately calculating the battery capacity loss value, it is beneficial to optimize the battery use and management strategy and extend the battery life.

[0056] The step S2 includes the following sub-steps:

[0057] Step S21, obtaining the influence coefficient of the ambient temperature on the battery capacity, the influence coefficient of the battery temperature on the battery capacity and the influence coefficient of the battery internal resistance on the battery, and collecting the ambient temperature, the battery temperature and the battery internal resistance;

[0058] Step S22, calculate the product of the ambient temperature and the influence coefficient of the ambient temperature on the battery capacity, recorded as the first product, calculate the product of the battery temperature and the influence coefficient of the battery temperature on the battery capacity, recorded as the second product, calculate the product of the battery internal resistance and the influence coefficient of the battery internal resistance on the battery, recorded as the third product, calculate the sum of the first product, the second product and the third product, and set the sum as the battery capacity loss value.

[0059] In the specific implementation, the capacity loss value is quantified to facilitate subsequent analysis, thereby improving the intuitiveness and accuracy of the analysis.

[0060] The step S3 includes the following sub-steps:

[0061] Step S31, setting charging simulation parameters and discharging simulation parameters, respectively simulating battery charging and battery discharging, wherein the charging simulation parameters include input voltage and a first battery temperature, and the discharging simulation parameters include output voltage and a second battery temperature, wherein the first battery temperature represents the battery temperature during the battery charging simulation process, and the second battery temperature represents the battery temperature during the battery discharging simulation process, wherein the ambient temperature is set to a first value, and the input voltage and the output voltage are used as variables, and are continuously regulated;

[0062] Step S32, detecting a first battery temperature, a battery internal resistance corresponding to the first battery temperature, a second battery temperature, and a battery internal resistance corresponding to the second battery temperature, calculating a battery capacity loss value according to the first battery temperature, the battery internal resistance corresponding to the first battery temperature, and the first value, and recording it as a charging battery capacity loss value, and calculating a battery capacity loss value according to the second battery temperature, the battery internal resistance corresponding to the second battery temperature, and the first value, and recording it as a discharging battery capacity loss value;

[0063] Step S33, setting the second value as the upper limit of the battery capacity loss value, the second value is distributed between 0 and 0.2, and is represented as the maximum allowable value of the battery capacity loss value, comparing the rechargeable battery capacity loss value with the second value, and obtaining a first comparison result, the first comparison result including the rechargeable battery capacity loss value being less than the second value and the rechargeable battery capacity loss value being greater than or equal to the second value, selecting the input voltage and the first battery temperature corresponding to the rechargeable battery capacity loss value being less than the second value, and recording them as the first confidence voltage and the first confidence battery temperature, respectively;

[0064] Step S34, compare the discharge battery capacity loss value with the second value to obtain a second comparison result, wherein the first comparison result includes that the discharge battery capacity loss value is less than the second value and that the discharge battery capacity loss value is greater than or equal to the second value, and select the output voltage and the second battery temperature corresponding to the discharge battery capacity loss value being less than the second value, and record them as the second confidence voltage and the second confidence battery temperature, respectively.

[0065] The step S33 further includes the following sub-steps:

[0066] Step S331, traversing the first confident battery temperatures and sorting the first confident battery temperatures in descending order;

[0067] Step S332, according to the charging durations corresponding to the first confident battery temperature matches after being sorted in descending order, the input voltage corresponding to the charging battery temperature with the largest value is set as the maximum charging voltage, and the input voltage corresponding to the charging battery temperature with the smallest value is set as the minimum charging voltage.

[0068] The step S34 also includes the following sub-steps:

[0069] Step S341, traversing the second confident battery temperatures and sorting the second confident battery temperatures in descending order;

[0070] Step S342, according to the discharge durations corresponding to the second confidence battery temperature matches after being sorted in descending order, the output voltage corresponding to the discharge battery temperature with the largest value is set as the maximum discharge voltage, and the input voltage corresponding to the discharge battery temperature with the smallest value is set as the minimum discharge voltage.

[0071] When the battery is charged, the real-time input voltage is measured, and the real-time input voltage is compared with the maximum charging voltage and the minimum charging voltage. When the real-time input voltage is less than the minimum charging voltage, the difference between the real-time input voltage and the minimum charging voltage is calculated, and an input voltage increase instruction is issued. When the real-time input voltage is greater than the maximum charging voltage, the difference between the maximum charging voltage and the implemented input voltage is calculated, and an input voltage decrease instruction is issued.

[0072] When the battery is discharging, the real-time output voltage is measured, and the real-time output voltage is compared with the maximum discharge voltage and the minimum discharge voltage. When the real-time output voltage is less than the minimum discharge voltage, the difference between the real-time output voltage and the minimum discharge voltage is calculated, and an instruction to increase the output voltage is issued. When the real-time output voltage is greater than the maximum discharge voltage, the difference between the maximum discharge voltage and the real-time output voltage is calculated, and an instruction to decrease the output voltage is issued.

[0073] In specific implementation, by setting charging and discharging simulation parameters, the performance of the battery under different conditions is accurately simulated, the charging and discharging strategies are optimized, and the battery capacity loss is reduced. The capacity loss value is calculated according to the influence of the first battery temperature and the second battery temperature on the battery internal resistance, which is helpful to select the best charging and discharging conditions in practical applications, thereby extending the battery life. Setting the maximum allowable capacity loss value as a limit can effectively control the capacity loss of the battery during the charging and discharging process, provide a more reliable battery management solution, and significantly improve the overall performance and stability of the battery by selecting the optimal voltage and temperature settings during the charging and discharging process.

[0074] The step S4 includes the following sub-steps:

[0075] Step S41, setting a first trigger condition, wherein the first trigger condition is a voice signal or a key signal;

[0076] Step S42, identifying the first trigger condition to obtain a first identification result, wherein the first identification result is an operation type request, and the operation type request includes a charging request, a discharging request, or an end request;

[0077] Step S43, performing a first operation according to the first recognition result, wherein the first operation is charging time recognition or discharging time recognition or displaying a completion mark.

[0078] In the specific implementation, by setting voice signals or button signals as trigger conditions, a variety of operation methods are provided to users, the convenience and flexibility of operation are improved, and the first trigger condition is identified to accurately distinguish charging, discharging or end requests, ensuring that the system performs corresponding operations according to the specific needs of users. By displaying the completion mark, users can understand the operation status in real time, thereby improving the user experience and transparency of operation.

[0079] The present invention accurately calculates the capacity loss value of the battery through the specific model and related parameters of the battery, which is beneficial to optimize the use and management strategy of the battery, prolong the life of the battery, and realizes more efficient energy conversion and storage through continuous regulation and optimization. The fuzzy rule and particle swarm algorithm are used to optimize the model, and the capacity loss of the battery is more accurately controlled. The charging and discharging strategy is dynamically adjusted to improve the efficiency and stability of the battery. By drawing the charging and discharging battery capacity loss value curve, intuitive data feedback is provided to the operator.

[0080] It should be understood by those skilled in the art that the embodiments of the present invention can be provided as methods, systems or computer program products. Therefore, the present invention can take the form of a complete hardware embodiment, a complete software embodiment or an embodiment combining software and hardware. Moreover, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media containing computer-usable program codes. Among them, the storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (Static Random Access Memory, referred to as SRAM), electrically erasable programmable read-only memory (Electrically Erasable Programmable Read-Only Memory, referred to as EEPROM), erasable programmable read-only memory (Erasable Programmable Read Only Memory, referred to as EPROM), programmable read-only memory (Programmable Red-Only Memory, referred to as PROM), read-only memory (Read-Only Memory, referred to as ROM), magnetic memory, flash memory, disk or optical disk. These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0081] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A bidirectional charging and discharging method for an energy storage battery, characterized in that: The following steps are involved: Step S1, obtaining the battery model and matching the battery related parameters corresponding to the battery model; Step S2, calculating the battery capacity loss value according to battery related parameters; Step S3, setting charging simulation parameters and discharging simulation parameters, simulating battery charging simulation and battery discharging, detecting the first battery temperature and the second battery temperature, respectively calculating the charging battery capacity loss value and the discharging battery capacity loss value, setting the first confidence battery temperature and the second confidence battery temperature according to the preset capacity loss value upper limit, and matching the corresponding charging time and discharging time respectively; Step S4, obtaining a user request, identifying the user request, obtaining an identification result, and performing a first operation according to the identification result.

2. A bidirectional charging and discharging method for an energy storage battery as claimed in claim 1, characterized in that: The step S1 includes the following sub-steps: Step S11, obtaining a battery surface image, scanning a QR code in the battery image, connecting to a network, and matching a corresponding battery model according to the QR code; Step S12, calling a battery database, inputting the battery model into the battery database, and obtaining battery-related parameters corresponding to the battery model, wherein the battery-related parameters include rated capacity, battery internal resistance, influence coefficient of ambient temperature on battery capacity, influence coefficient of battery temperature on battery capacity, and influence coefficient of battery internal resistance on battery; The battery database includes battery model, rated capacity, battery internal resistance, influence coefficient of ambient temperature on battery capacity, influence coefficient of battery temperature on battery capacity and influence coefficient of battery internal resistance on battery.

3. A bidirectional charging and discharging method for an energy storage battery as claimed in claim 1, characterized in that: The step S2 includes the following sub-steps: Step S21, obtaining the influence coefficient of the ambient temperature on the battery capacity, the influence coefficient of the battery temperature on the battery capacity and the influence coefficient of the battery internal resistance on the battery, and collecting the ambient temperature, the battery temperature and the battery internal resistance; Step S22, calculate the product of the ambient temperature and the influence coefficient of the ambient temperature on the battery capacity, recorded as the first product, calculate the product of the battery temperature and the influence coefficient of the battery temperature on the battery capacity, recorded as the second product, calculate the product of the battery internal resistance and the influence coefficient of the battery internal resistance on the battery, recorded as the third product, calculate the sum of the first product, the second product and the third product, and set the sum as the battery capacity loss value.

4. A bidirectional charging and discharging method for an energy storage battery as claimed in claim 1, characterized in that: The step S3 includes the following sub-steps: Step S31, setting charging simulation parameters and discharging simulation parameters, respectively simulating battery charging and battery discharging, wherein the charging simulation parameters include input voltage and a first battery temperature, and the discharging simulation parameters include output voltage and a second battery temperature, wherein the first battery temperature represents the battery temperature during the battery charging simulation process, and the second battery temperature represents the battery temperature during the battery discharging simulation process, wherein the ambient temperature is set to a first value, and the input voltage and the output voltage are used as variables, and are continuously regulated; Step S32, detecting a first battery temperature, a battery internal resistance corresponding to the first battery temperature, a second battery temperature, and a battery internal resistance corresponding to the second battery temperature, calculating a battery capacity loss value according to the first battery temperature, the battery internal resistance corresponding to the first battery temperature, and the first value, and recording it as a charging battery capacity loss value, and calculating a battery capacity loss value according to the second battery temperature, the battery internal resistance corresponding to the second battery temperature, and the first value, and recording it as a discharging battery capacity loss value; Step S33, setting the second value as the upper limit of the battery capacity loss value, the second value is distributed between 0 and 0.2, and is represented as the maximum allowable value of the battery capacity loss value, comparing the rechargeable battery capacity loss value with the second value, and obtaining a first comparison result, the first comparison result including the rechargeable battery capacity loss value being less than the second value and the rechargeable battery capacity loss value being greater than or equal to the second value, selecting the input voltage and the first battery temperature corresponding to the rechargeable battery capacity loss value being less than the second value, and recording them as the first confidence voltage and the first confidence battery temperature, respectively; Step S34, compare the discharge battery capacity loss value with the second value to obtain a second comparison result, wherein the first comparison result includes that the discharge battery capacity loss value is less than the second value and that the discharge battery capacity loss value is greater than or equal to the second value, and select the output voltage and the second battery temperature corresponding to the discharge battery capacity loss value being less than the second value, and record them as the second confidence voltage and the second confidence battery temperature, respectively.

5. A bidirectional charging and discharging method for an energy storage battery as claimed in claim 4, characterized in that: The step S33 further includes the following sub-steps: Step S331, traversing the first confident battery temperatures and sorting the first confident battery temperatures in descending order; Step S332, according to the charging durations corresponding to the first confident battery temperature matches after being sorted in descending order, the input voltage corresponding to the charging battery temperature with the largest value is set as the maximum charging voltage, and the input voltage corresponding to the charging battery temperature with the smallest value is set as the minimum charging voltage.

6. A bidirectional charging and discharging method for an energy storage battery as claimed in claim 4, characterized in that: The step S34 also includes the following sub-steps: Step S341, traversing the second confident battery temperatures and sorting the second confident battery temperatures in descending order; Step S342, according to the discharge durations corresponding to the second confidence battery temperature matches after being sorted in descending order, the output voltage corresponding to the discharge battery temperature with the largest value is set as the maximum discharge voltage, and the input voltage corresponding to the discharge battery temperature with the smallest value is set as the minimum discharge voltage.

7. A bidirectional charging and discharging method for an energy storage battery as claimed in claim 6, characterized in that: When the battery is charged, the real-time input voltage is measured, and the real-time input voltage is compared with the maximum charging voltage and the minimum charging voltage. When the real-time input voltage is less than the minimum charging voltage, the difference between the real-time input voltage and the minimum charging voltage is calculated, and an input voltage increase instruction is issued. When the real-time input voltage is greater than the maximum charging voltage, the difference between the maximum charging voltage and the implemented input voltage is calculated, and an input voltage decrease instruction is issued. When the battery is discharging, the real-time output voltage is measured, and the real-time output voltage is compared with the maximum discharge voltage and the minimum discharge voltage. When the real-time output voltage is less than the minimum discharge voltage, the difference between the real-time output voltage and the minimum discharge voltage is calculated, and an instruction to increase the output voltage is issued. When the real-time output voltage is greater than the maximum discharge voltage, the difference between the maximum discharge voltage and the real-time output voltage is calculated, and an instruction to decrease the output voltage is issued.

8. A bidirectional charging and discharging method for an energy storage battery as claimed in claim 1, characterized in that: The step S4 includes the following sub-steps: Step S41, setting a first trigger condition, wherein the first trigger condition is a voice signal or a key signal; Step S42, identifying the first trigger condition to obtain a first identification result, wherein the first identification result is an operation type request, and the operation type request includes a charging request, a discharging request, or an end request; Step S43, performing a first operation according to the first recognition result, wherein the first operation is charging time recognition or discharging time recognition or displaying a completion mark.

9. A bidirectional charging and discharging system for energy storage batteries, characterized in that: It includes acquisition module, calculation module, simulation module and execution module; The acquisition module is used to obtain the battery model and match the battery related parameters corresponding to the battery model; The calculation module is used to calculate the battery capacity loss value according to the battery related parameters; The simulation module is used to set charging simulation parameters and discharging simulation parameters, simulate battery charging simulation and battery discharging, detect the first battery temperature and the second battery temperature, respectively calculate the charging battery capacity loss value and the discharging battery capacity loss value, set the first confidence battery temperature and the second confidence battery temperature according to the preset capacity loss value, and respectively match the corresponding charging time and discharging time; The execution module obtains a user request, identifies the user request, obtains an identification result, and executes a first operation according to the identification result.

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