Charging control method and device of energy storage equipment, electronic equipment and medium

Abstract

The invention discloses a charging control method and device for energy storage equipment, electronic equipment and a medium. The method comprises the steps that the battery temperature, the battery charge state and the charging voltage of the energy storage equipment monitored in real time in the charging process are acquired and serve as charging state parameters of the energy storage equipment; determining a target charging threshold value adapted to the current charging state of the energy storage equipment according to the charging state parameter; wherein the target charging threshold value is smaller than a preset candidate charging threshold value; the candidate charging threshold is a protection threshold set in the charging process of the energy storage equipment; and controlling the charging process of the energy storage equipment according to the target charging threshold value. According to the technical scheme, under any charging condition, the charging boundary current of the energy storage equipment can be effectively controlled to be within the maximum allowable charging current values at different temperatures, the safety and performance risks of the energy storage equipment are avoided to the maximum extent, stable charging of the energy storage equipment can be guaranteed, and the service life of the energy storage equipment is prolonged.

Description

Technical Field

[0001] The present invention relates to the field of charging control technology, and in particular to a charging control method, device, electronic equipment and medium for energy storage equipment. Background Art

[0002] There are many different methods of power generation available today, including nuclear power, photovoltaic power, wind power, hydropower, thermal power, tidal power, ocean power, and hydroelectric power. Due to weather changes, such as heavy rain, typhoons, and natural disasters like grid outages, power system instability can occur in real time, impacting the charging of various energy storage devices. Energy storage devices require a stable voltage environment during the charging and discharging process. Excessive voltage can cause excessive battery charging current, accelerating battery aging and even leading to safety incidents such as battery bulging, leakage, or explosion. Excessively low voltage may prevent the battery from fully charging, affecting the energy storage device's capacity and the energy available for the next discharge. This unstable voltage waveform and unbalanced current, when applied to energy storage devices, can cause abnormal operation and trigger the BMS (Battery Management System) management and protection mechanisms.

[0003] Currently, most common protection mechanisms only provide maximum overcurrent protection, which limits charging when the current approaches or reaches the battery's maximum current (this threshold is generally the maximum threshold defined for the battery at room temperature).

[0004] In unstable power conditions, the charging current can easily exceed the battery's MAP value, posing a threat to battery safety and performance. MAP (Maximum Allowable Peaking Current) refers to the maximum allowable charging current at different temperatures. It specifies the maximum instantaneous current a battery can safely accept during charging. Summary of the invention

[0005] The present invention provides a charging control method, device, electronic device, and medium for an energy storage device. Under any charging conditions, the boundary current of the energy storage device can be effectively controlled to be within the maximum allowable charging current value at different temperatures, thereby minimizing safety and performance risks of the energy storage device, ensuring stable charging of the energy storage device, and extending the service life of the energy storage device.

[0006] According to one aspect of the present invention, a method for controlling charging of an energy storage device is provided, the method comprising:

[0007] Acquire the battery temperature, battery state of charge, and charging voltage of the energy storage device during the charging process of real-time monitoring as charging state parameters of the energy storage device;

[0008] Determine a target charging threshold adapted to the current charging state of the energy storage device according to the charging state parameter; wherein, the target charging threshold is less than a preset candidate charging threshold; the candidate charging threshold is a protection threshold set during the charging process of the energy storage device;

[0009] Control the charging process of the energy storage device according to the target charging threshold.

[0010] According to another aspect of the present invention, there is provided a charging control device for an energy storage device, the device comprising:

[0011] A charging state parameter acquisition module, configured to acquire the battery temperature, state of charge, and charging voltage of the energy storage device during the charging process in real time as the charging state parameter of the energy storage device;

[0012] A target charging threshold determination module, configured to determine a target charging threshold adapted to the current charging state of the energy storage device according to the charging state parameter; wherein, the target charging threshold is less than a preset candidate charging threshold; the candidate charging threshold is a protection threshold set during the charging process of the energy storage device;

[0013] A charging control module, configured to control the charging process of the energy storage device according to the target charging threshold.

[0014] According to another aspect of the present invention, there is provided an electronic device, the electronic device comprising:

[0015] At least one processor; and a memory communicatively connected to the at least one processor; wherein, the memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute a charging control method for an energy storage device according to any embodiment of the present invention.

[0016] According to another aspect of the present invention, there is provided a computer-readable storage medium, the computer-readable storage medium stores computer instructions, and the computer instructions are used to cause a processor to implement a charging control method for an energy storage device according to any embodiment of the present invention when executed.

[0017] The technical solution of the embodiment of the present invention obtains the battery temperature, state of charge of the battery, and charging voltage during the charging process of the energy storage device in real time, determines the target charging threshold adapted to the current charging state of the energy storage device based on the battery temperature, state of charge of the battery, and charging voltage during the charging process, and then controls the charging process of the energy storage device according to the target charging threshold. This technical solution can effectively control the boundary current of the energy storage device charging within the maximum allowable charging current value at different temperatures under any charging conditions, maximally avoiding the safety and performance risks of the energy storage device, ensuring the stable charging of the energy storage device, and extending the service life of the energy storage device.

[0018] It should be understood that the content described in this part is not intended to number the key or important features of the embodiments of the present invention, nor is it used to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 is a flowchart of a method for controlling the charging of an energy storage device according to Embodiment 1 of the present invention;

[0021] Figure 2 is a flowchart of the charging control method provided in Embodiment 1 of the present application;

[0022] Figure 3 is a schematic diagram of a charging control process of an energy storage device provided in Embodiment 2 of the present invention;

[0023] Figure 4 is a flowchart of another charging control process of an energy storage device provided in Embodiment 3 of the present invention;

[0024] Figure 5 is a flowchart of another charging control process of an energy storage device provided in Embodiment 4 of the present invention;

[0025] Figure 6 is a flowchart of another method for controlling the charging of an energy storage device provided in Embodiment 5 of the present invention;

[0026] Figure 7 is a schematic diagram of the structure of a charging control device of an energy storage device provided in Embodiment 6 of the present invention;

[0027] Figure 8It is a schematic structural diagram of an electronic device for implementing a charging control method of an energy storage device according to an embodiment of the present invention. Detailed implementation manners

[0028] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0029] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units does not necessarily have to be limited to those clearly listed steps or units, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0030] Embodiment 1

[0031] Figure 1 It is a flowchart of a charging control method of an energy storage device according to Embodiment 1 of the present invention. This embodiment is applicable to the situation of controlling the charging process of the energy storage device. This method can be executed by a charging control device of the energy storage device. The charging control device of the energy storage device can be implemented in the form of hardware and / or software, and the charging control device of the energy storage device can be configured in the device. For example, the device can be a device with communication and computing capabilities such as a background server. As Figure 1 shown, the method includes:

[0032] S110. Obtain the battery temperature, state of charge, and charging voltage of the energy storage device during the charging process in real-time monitoring as the charging state parameters of the energy storage device.

[0033] In this solution, the energy storage device is a device for storing energy. It can store energy when the energy generation is excessive and release energy when needed to meet the energy requirements in various application scenarios. For example, the energy storage device can be an industrial and commercial energy storage device, a balcony energy storage device, a mobile and portable energy storage device, etc.

[0034] Among them, the battery temperature refers to the temperature reached by the battery during charging; the state of charge (SOC) of the battery represents the remaining power of the battery at present; the charging voltage refers to the voltage applied across the battery when charging the battery of the energy storage device.

[0035] In this embodiment, the battery temperature, the state of charge of the battery, and the charging voltage during the charging process of the energy storage device can be obtained based on the battery management system. Specifically, the battery management system collects the battery temperature, the charging voltage, and other battery-related data during the charging process of the energy storage device in real time through pre-configured sensors, and calculates the state of charge of the battery based on other battery-related data.

[0036] Among them, an intelligent charging device can also be used to obtain the battery temperature, the state of charge of the battery, and the charging voltage during the charging process of the energy storage device. The intelligent charging device itself has a monitoring function and can collect information such as the charging voltage and charging current of the battery in real time during the charging process, and estimate the battery temperature and the state of charge of the battery through built-in algorithms.

[0037] S120. Determine a target charging threshold adapted to the current charging state of the energy storage device according to the charging state parameter; wherein, the target charging threshold is less than a preset candidate charging threshold; the candidate charging threshold is a protection threshold set during the charging process of the energy storage device.

[0038] In this solution, the candidate charging threshold is the maximum overcurrent protection threshold or the maximum power threshold set during the charging process of the energy storage device.

[0039] Among them, the target charging threshold is a charging limit boundary threshold set during the charging process of the energy storage device, and the target charging threshold is less than the candidate charging threshold. The target charging threshold can be a charging limit current protection value or a charging limit power protection value.

[0040] In this embodiment, a target charging threshold adapted to the current charging state of the energy storage device can be selected from the pre-determined charging thresholds based on the battery temperature, the state of charge of the battery, and the charging voltage.

[0041] In this solution, the battery temperature, the state of charge of the battery, and the charging voltage can also be predicted based on a pre-established battery model to determine a target charging threshold adapted to the current charging state of the energy storage device. Among them, a battery model that can accurately describe the battery charging characteristics, such as an equivalent circuit model, an electrochemical model, etc., can be established through experiments and data analysis.

[0042] Specifically, the battery temperature, the state of charge of the battery, and the charging voltage can also be used as input parameters to be fuzzified and converted into fuzzy language variables. According to the rules in the fuzzy rule base, fuzzy inference is performed to obtain the fuzzy output of the target charging threshold adapted to the current charging state. Finally, through defuzzification operation, the fuzzy output is converted into a specific value.

[0043] S130. Control the charging process of the energy storage device according to the target charging threshold.

[0044] In this embodiment, when the charging current is less than or equal to the target charging threshold, the energy storage device is charged; or, when the charging power corresponding to the charging current is less than or equal to the target charging threshold, the energy storage device is charged.

[0045] In this solution, during the charging process of the energy storage device, precise control is implemented based on the target charging threshold, which can effectively cope with abnormal impact currents generated in complex scenarios such as unstable power systems, sudden access of additional charging power sources, and sudden disconnection of loads. At the same time, it can also avoid the occurrence of impact currents in the energy storage device in extreme high and low temperature environments, thereby achieving effective interception of abnormal charging and ensuring the safety and stability of the charging process of the energy storage device.

[0046] Further, when the battery temperature is less than the preset first temperature, the charging operation of the energy storage device is not performed; when the battery temperature is greater than the preset second temperature, the charging operation of the energy storage device is also not performed. Wherein, the first temperature is less than the second temperature, and the first temperature and the second temperature can be set based on the performance of the battery of the energy storage device. For example, the first temperature can be set to 0°C, and the second temperature can be set to 55°C.

[0047] Optionally, controlling the charging process of the energy storage device according to the target charging threshold includes:

[0048] During the charging process of the energy storage device, the charging current signal is monitored in real time;

[0049] If the charging current signal is an abnormal current signal, the charging process of the energy storage device is controlled according to the target charging threshold; wherein, the abnormal current signal is a signal exceeding the first charging current range; the first charging current range is determined according to the candidate charging threshold;

[0050] During the process of controlling the charging process of the energy storage device according to the target charging threshold, if the charging current signal is a normal current signal, the charging process of the energy storage device is controlled according to the candidate charging threshold; wherein, the normal current signal is a signal within the second charging current range; the second charging current range is determined according to the target charging threshold; the upper limit of the second charging current range is less than the lower limit of the first charging current range.

[0051] In this embodiment, the abnormal current signal refers to a signal in which at least one of the amplitude range, frequency characteristics, phase relationship, and time characteristics of the current change exceeds the first charging current range. Among them, the first charging current range is set according to the candidate charging threshold. In this solution, the normal current signal refers to a signal in which the amplitude range, frequency characteristics, phase relationship, and time characteristics of the current change are within the second charging current range. Among them, the second charging current range is set according to the target charging threshold. The upper limit of the second charging current range is less than the lower limit of the first charging current range.

[0052] In this solution, there is usually a multiple-level difference between the candidate charging threshold and the MAP value of the battery in low-temperature and high-temperature environments. Therefore, during the charging of the energy storage device, the target charging threshold and the candidate charging threshold are set simultaneously to control the charging process, so as to ensure that the current during the charging process is always within the MAP value range of the battery. Among them, the target charging threshold belongs to the charging limit boundary protection logic mechanism under high SOP (Standard Operating Procedure). Once an abnormal current signal is detected, the system will give priority to executing the target charging threshold, rather than cutting off the circuit until the candidate charging threshold is triggered.

[0053] Specifically, the charging current signal during the charging process of the energy storage device can be monitored in real time based on the current signal sensor. When the charging current signal is a signal exceeding the first charging current range, the charging process of the energy storage device is controlled according to the target charging threshold; when the charging current signal is a signal within the second charging current range, the charging process of the energy storage device is controlled according to the candidate charging threshold.

[0054] In this solution, Figure 2 is the flowchart of the charging control method provided in the first embodiment of this application. As Figure 2 shown, the battery management system is responsible for reading the battery temperature, state of charge of the battery, and charging voltage, and determining the target charging threshold based on the battery temperature, state of charge of the battery, and charging voltage. Subsequently, the charging control is started according to the target charging threshold. During the charging process of the energy storage device, the system will continuously monitor the charging current signal. Once an abnormal current signal is detected, the system will continue to perform charging control according to the target charging threshold; when the abnormal current signal disappears, the system will resume charging control according to the candidate charging threshold based on the battery temperature, state of charge of the battery, and charging voltage. If no abnormal current signal is detected, the system will always use the candidate charging threshold for charging control. Among them, when the abnormal current signal disappears, if the battery temperature, state of charge of the battery, and charging voltage are within the preset abnormal range, the control will continue according to the target charging threshold.

[0055] The technical solution of the embodiment of the present invention obtains the battery temperature, state of charge, and charging voltage of the energy storage device during the charging process in real time, determines the target charging threshold adapted to the current charging state of the energy storage device based on the battery temperature, state of charge, and charging voltage during the charging process, and then controls the charging process of the energy storage device according to the target charging threshold. By implementing this technical solution, under any charging conditions, the boundary current of the energy storage device charging can be effectively controlled within the maximum allowable charging current values at different temperatures, maximizing the avoidance of the safety and performance risks of the energy storage device, ensuring the stable charging of the energy storage device, and prolonging the service life of the energy storage device.

[0056] Embodiment 2

[0057] Figure 3 It is a schematic diagram of the charging control process of an energy storage device provided in Embodiment 2 of the present invention. The relationship between this embodiment and the above embodiment is a detailed description of the target charging threshold determination process. As Figure 3 shown, the method includes:

[0058] S310. Obtain the battery temperature, state of charge, and charging voltage of the energy storage device during the charging process in real time as the charging state parameters of the energy storage device.

[0059] S320. Determine the target temperature range where the battery temperature is located, the target state of charge range where the state of charge of the battery is located, and the target voltage range where the charging voltage is located.

[0060] In this solution, the temperature range, state of charge range, and voltage range are pre-set according to the charging control requirements of the energy storage device. For example, the temperature range can be set as [0°C - 10°C], (10°C - 20°C], (20°C - 45°C], (45°C - 55°C]. The state of charge range can be set as [0 - 60%], (60% - 100%]; it can also be set as [0 - 75%], (75% - 98%], (98% - 100%]. The voltage range can be set as [0 - 3.4], (3.4 - 3.6].

[0061] Furthermore, after obtaining the battery temperature, state of charge, and charging voltage, the battery management system will compare the battery temperature with the pre-configured temperature ranges one by one to determine the target temperature range where the battery temperature is located; match the state of charge of the battery with the pre-configured state of charge ranges to determine the target state of charge range corresponding to the state of charge of the battery; compare the charging voltage with the pre-configured voltage ranges to determine the target voltage range where the charging voltage is located.

[0062] S330. Determine a target charging threshold adapted to the current charging state of the energy storage device based on the target temperature range in which the battery temperature is located, the target state of charge range in which the battery state of charge is located, and the target voltage range in which the charging voltage is located.

[0063] In this solution, based on the target temperature range in which the battery temperature is located, the target state of charge range in which the battery state of charge is located, and the target voltage range in which the charging voltage is located, a target charging threshold adapted to the current charging state of the energy storage device can be determined from a pre-determined stepped charging strategy mapping relationship table. The temperature range, state of charge range, and voltage range in the stepped charging strategy mapping relationship table correspond to each other one by one.

[0064] Further, it is also possible to first determine the target temperature range in which the battery temperature is located, and then based on the stepped charging strategy mapping relationship table corresponding to the target temperature range, determine a target charging threshold adapted to the current charging state of the energy storage device based on the target state of charge range in which the battery state of charge is located and the target voltage range in which the charging voltage is located. The state of charge range and voltage range in the stepped charging strategy mapping relationship table corresponding to the target temperature range correspond to each other one by one.

[0065] In this embodiment, it is also possible to first determine the target state of charge range in which the battery state of charge is located, and then based on the stepped charging strategy mapping relationship table corresponding to the target state of charge range, determine a target charging threshold adapted to the current charging state of the energy storage device based on the target temperature range in which the battery temperature is located and the target voltage range in which the charging voltage is located. The temperature range and voltage range in the stepped charging strategy mapping relationship table corresponding to the target state of charge range correspond to each other one by one.

[0066] Among them, it is also possible to first determine the target voltage range in which the charging voltage is located, and then based on the stepped charging strategy mapping relationship table corresponding to the target voltage range, determine a target charging threshold adapted to the current charging state of the energy storage device based on the target temperature range in which the battery temperature is located and the target state of charge range in which the battery state of charge is located. The state of charge range and temperature range in the stepped charging strategy mapping relationship table corresponding to the target voltage range correspond to each other one by one.

[0067] S340. Control the charging process of the energy storage device according to the target charging threshold.

[0068] In the technical solution of the embodiment of the present invention, by obtaining the battery temperature, the state of charge of the battery, and the charging voltage during the charging process of the energy storage device in real time, and determining a target charging threshold adapted to the current charging state of the energy storage device based on the target temperature range in which the battery temperature is located, the target state of charge range in which the state of charge of the battery is located, and the target voltage range in which the charging voltage is located, and then controlling the charging process of the energy storage device according to the target charging threshold. By implementing this technical solution, under any charging conditions, the boundary current of the energy storage device charging can be effectively controlled within the maximum allowable charging current value at different temperatures, maximizing the avoidance of the safety and performance risks of the energy storage device, ensuring the stable charging of the energy storage device, and extending the service life of the energy storage device.

[0069] Embodiment III

[0070] Figure 4 FIG. is a flowchart of a charging control process of another energy storage device provided in Embodiment III of the present invention. The relationship between this embodiment and the above embodiment is a detailed description of the process of determining the target charging threshold. As Figure 4 shown, the method includes:

[0071] S410. Obtain the battery temperature, the state of charge of the battery, and the charging voltage during the charging process of the energy storage device in real time as the charging state parameters of the energy storage device.

[0072] S420. Determine the target temperature range in which the battery temperature is located, the target state of charge range in which the state of charge of the battery is located, and the target voltage range in which the charging voltage is located.

[0073] S430. In each control stage corresponding to the target temperature range, determine a target charging threshold adapted to the current charging state of the energy storage device according to the target state of charge range in which the state of charge of the battery is located and the target voltage range in which the charging voltage is located; wherein, each control stage includes a corresponding state of charge range and voltage range; the control stage is obtained by dividing the charging process of the energy storage device, and in the dividing process, the control stages are sequentially assigned ascending identification numbers from small to large according to the ascending order of the charging process from small to large.

[0074] In this solution, the control stage is obtained by dividing the charging process of the energy storage device, and in the dividing process, the control stages are sequentially assigned ascending identification numbers from small to large according to the ascending order of the charging process from small to large. For example, the control stage can be represented by control stage 1, control stage 2, and control stage 3.

[0075] In this embodiment, the correspondence between the temperature range and the control stage has been pre-planned and determined. The number of settings for each control stage in different temperature ranges can be the same or different. For example, assume there are temperature range 1 and temperature range 2. The control stages corresponding to temperature range 1 can include control stage 1 and control stage 2; or it can include control stage 1, control stage 2, and control stage 3. Similarly, the control stages corresponding to temperature range 2 can include control stage 1 and control stage 2; or it can include control stage 1, control stage 2, and control stage 3.

[0076] Among them, each control stage includes a corresponding battery state of charge range and voltage range. For example, taking the control stage corresponding to temperature range 1 as an example, this control stage covers control stage 1 and control stage 2. Among them, within control stage 1, there is a one-to-one correspondence between the battery state of charge range and the voltage range; similarly, within control stage 2, there is also a one-to-one correspondence between the battery state of charge range and the voltage range.

[0077] In this solution, the correspondence between the temperature range and the control stage is shown in Table 1. Temperature range 1 is (T1 - T2], and the control stages corresponding to temperature range 1 include control stage 1 and control stage 2. Control stage 1 includes a battery state of charge range of [0 - SOC1] and a charging cut-off voltage of MaxU1, that is, the voltage range is [0 - U1]; control stage 2 includes a battery state of charge range of (SOC1 - 100%] and a charging cut-off voltage of MaxU LCV , that is, the voltage range is (U1 - U LCV . Temperature range 2 is (T2 - T3], and the control stages corresponding to temperature range 2 include control stage 1, control stage 2, and control stage 3. Control stage 1 includes a battery state of charge range of [0 - SOC2] and a charging cut-off voltage of MaxU2, that is, the voltage range is [0 - U2]; control stage 2 includes a battery state of charge range of (SOC2 - SOC3] and a charging cut-off voltage of MaxU3, that is, the voltage range is (U2 - U3]; control stage 3 includes a battery state of charge range of (SOC3 - 100%] and a charging cut-off voltage of MaxU LCV , that is, the voltage range is (U3 - U LCV. The temperature range 3 is (T3 - T4], and the control stages corresponding to the temperature range 3 include control stage 1, control stage 2, control stage 3, and control stage 4. Control stage 1 includes a state of charge range of [0 - SOC5] and a charging cut-off voltage of MaxU4, that is, a voltage range of [0 - U4]; control stage 2 includes a state of charge range of (SOC5 - SOC6] and a charging cut-off voltage of MaxU5, that is, a voltage range of (U4 - U5]; control stage 3 includes a state of charge range of (SOC6 - SOC7] and a charging cut-off voltage of MaxU6, that is, a voltage range of (U5 - U6]; control stage 4 includes a state of charge range of (SOC7 - 100%] and a charging cut-off voltage of MaxU LCV , that is, a voltage range of (U6 - U LCV . The temperature range 4 is (T1 - T2], and the control stage corresponding to the temperature range 4 includes control stage 1. Control stage 1 includes a state of charge range of [0 - 100%] and a charging cut-off voltage of MaxU LCV , that is, a voltage range of (0 - U LCV . Among them, U1 < U LCV , U2 ≤ U3 < U LCV , U4 ≤ U5 ≤ U6 < U LCV , the voltage U LCV (limited charge voltage) is the charging cut-off voltage when the battery reaches 100% state of charge.

[0078] Table 1

[0079]

[0080] Further, first determine the target temperature range in which the battery temperature is located, and then in each control stage corresponding to the target temperature range, respectively find the target state of charge range in which the state of charge of the battery is located and the target voltage range in which the charging voltage is located, and then determine the target charging threshold adapted to the current charging state of the energy storage device based on the target state of charge range in which the state of charge of the battery is located and the target voltage range in which the charging voltage is located.

[0081] Optionally, determining the target charging threshold adapted to the current charging state of the energy storage device according to the target state of charge range in which the state of charge of the battery is located and the target voltage range in which the charging voltage is located includes:

[0082] When the control stage corresponding to the target state of charge range and the control stage corresponding to the target voltage range are the same stage, determine the charging threshold matching the control stage as the target charging threshold adapted to the current charging state of the energy storage device;

[0083] When the control phase corresponding to the target state of charge range and the control phase corresponding to the target voltage range are different phases, select the control phase with the largest identification serial number from the control phase corresponding to the target state of charge range and the control phase corresponding to the target voltage range as the target control phase, and determine the charging threshold matching the target control phase as the target charging threshold adapted to the current charging state of the energy storage device.

[0084] Among them, the charging threshold is the charging limit boundary threshold set during the charging process of the energy storage device. The matching relationship between the control phase and the charging threshold has been determined in advance. As shown in Table 1, the temperature range 1 is (T1 - T2], and the control phases corresponding to the temperature range 1 include control phase 1 and control phase 2. The charging threshold matched by control phase 1 is I1 or P1; the charging threshold matched by control phase 2 is I2 or P2. The temperature range 2 is (T2 - T3], and the control phases corresponding to the temperature range 2 include control phase 1, control phase 2, and control phase 3. The charging threshold matched by control phase 1 is I3 or P3; the charging threshold matched by control phase 2 is I4 or P4; the charging threshold matched by control phase 3 is I5 or P5. The temperature range 3 is (T3 - T4], and the control phases corresponding to the temperature range 3 include control phase 1, control phase 2, control phase 3, and control phase 4. The charging threshold matched by control phase 1 is I6 or P6; the charging threshold matched by control phase 2 is I7 or P7; the charging threshold matched by control phase 3 is I8 or P8; the charging threshold matched by control phase 4 is I9 or P9. The temperature range 4 is (T1 - T2], and the control phase corresponding to the temperature range 4 includes control phase 1. The charging threshold matched by control phase 1 is I 10 or P 10 .

[0085] In this solution, when the control phase corresponding to the target state of charge range and the control phase corresponding to the target voltage range are the same phase, look up in the stepped charging strategy mapping relationship table to determine the charging threshold matching the control phase, and use this threshold as the target charging threshold adapted to the current charging state of the energy storage device.

[0086] In this solution, during the charging process, when either the state of charge of the battery or the charging voltage reaches the preset specified value first, the corresponding target charging threshold will be immediately activated, so as to always control the battery charging process within the safe boundary and ensure charging safety.

[0087] Specifically, when the control phase corresponding to the target state of charge range of the battery and the control phase corresponding to the target voltage range are different phases, select the control phase with the largest identification number from the control phase corresponding to the target state of charge range of the battery and the control phase corresponding to the target voltage range as the target control phase, search in the stepped charging strategy mapping relationship table to determine the charging threshold that matches the target control phase, and use this charging threshold as the target charging threshold adapted to the current charging state of the energy storage device.

[0088] In this embodiment, during the charging process of the energy storage device, if the target state of charge range in which the state of charge of the battery is located and / or the target voltage range in which the charging voltage is located change, determine the newly changed target state of charge range of the battery and / or target voltage range, and determine the newly changed target charging threshold based on the newly changed target state of charge range of the battery and / or target voltage range.

[0089] In this solution, during the charging process of the energy storage device, if the target temperature range in which the battery temperature is located changes, determine the newly changed target temperature range. Within each control phase corresponding to the newly changed target temperature range, determine the target charging threshold adapted to the current charging state of the energy storage device according to the target state of charge range in which the state of charge of the battery is located and the target voltage range in which the charging voltage is located.

[0090] By real-time monitoring of the battery temperature, state of charge, and charging voltage, the charging state of the battery can be accurately grasped. The battery management system will intelligently regulate and only input current within a safe range to the battery, greatly optimizing the battery boundary limit protection mechanism. The precise control of the target charging threshold effectively prevents the problem of excessive decomposition of the electrolyte caused by too large current, and effectively guarantees the safety and life of the battery. And it can ensure that the battery always maintains stable performance during the charging process, avoiding negative impacts on the battery performance caused by current fluctuations. Especially in complex situations such as unstable power systems, or sudden access to additional charging power sources, sudden disconnection of loads resulting in current surges, etc., reasonable current limitation can fully play its role to ensure the stable operation of the battery and provide a solid guarantee for user safety.

[0091] S440. Control the charging process of the energy storage device according to the target charging threshold.

[0092] In the technical solution of the embodiment of the present invention, by obtaining the battery temperature, the state of charge of the battery, and the charging voltage during the charging process of the energy storage device in real time, and within each control stage corresponding to the target temperature range in which the battery temperature is located, based on the target state of charge range in which the state of charge of the battery is located and the target voltage range in which the charging voltage is located, a target charging threshold adapted to the current charging state of the energy storage device is determined, and then the charging process of the energy storage device is controlled according to the target charging threshold. By implementing this technical solution, under any charging conditions, the boundary current of the energy storage device charging can be effectively controlled within the maximum allowable charging current value at different temperatures, maximizing the avoidance of the safety and performance risks of the energy storage device, ensuring the stable charging of the energy storage device, and extending the service life of the energy storage device.

[0093] Optionally, when the energy storage device is any one of a lithium-ion battery, a lead-acid battery, and a nickel-metal hydride battery, the statistical relationship between the target charging threshold and the battery temperature includes:

[0094] The target temperature range in which the battery temperature is located includes a first temperature range, a second temperature range, and a third temperature range; the upper limit of the first temperature range is less than the lower limit of the second temperature range; the upper limit of the second temperature range is less than the lower limit of the third temperature range;

[0095] The charging threshold corresponding to the first temperature range is less than the charging threshold corresponding to the second temperature range; the charging threshold corresponding to the third temperature range is less than the charging threshold corresponding to the second temperature.

[0096] Among them, lithium-ion batteries include batteries such as ternary batteries, lithium iron phosphate batteries, lithium manganese iron phosphate batteries, and sodium batteries.

[0097] In this solution, as shown in Table 2. When the energy storage device is a lithium-ion battery, according to the requirements of the energy storage power supply and the battery performance characteristics, a reasonable stepped charging strategy is formulated, and the battery charging is controlled based on the stepped charging strategy. Among them, the relationship between the charging threshold and the battery temperature is a non-linear inverted U-shaped relationship.

[0098] Specifically, assuming that the target temperature range in which the battery temperature is located includes a first temperature range, a second temperature range, and a third temperature range; the upper limit of the first temperature range is less than the lower limit of the second temperature range; the upper limit of the second temperature range is less than the lower limit of the third temperature range; then the charging threshold corresponding to the first temperature range is less than the charging threshold corresponding to the second temperature range; the charging threshold corresponding to the third temperature range is less than the charging threshold corresponding to the second temperature.

[0099] Table 2

[0100]

[0101] By implementing multiple protection measures through the battery management system, under any charging conditions, the boundary current of the energy storage device during charging can be effectively controlled within the maximum allowable charging current values at different temperatures, reducing the damage of active substances inside the lithium-ion battery and the generation of lithium dendrites, thereby delaying capacity attenuation, maximizing the avoidance of safety and performance risks of the energy storage device, ensuring the stable charging of the energy storage device, and extending the service life of the energy storage device.

[0102] Embodiment 4

[0103] Figure 5 FIG. is a flowchart of the charging control process of another energy storage device provided in Embodiment 4 of the present invention. The relationship between this embodiment and the above embodiment is a detailed description of the target charging threshold determination process. As Figure 5 shown, the method includes:

[0104] S510. Obtain the battery temperature, state of charge, and charging voltage during the charging process of the energy storage device in real-time monitoring as the charging state parameters of the energy storage device.

[0105] S520. Determine the target temperature range where the battery temperature is located, the target state of charge range where the state of charge of the battery is located, and the target voltage range where the charging voltage is located.

[0106] S530. Determine the control stage corresponding to the target temperature range, the control stage corresponding to the target state of charge range, and the control stage corresponding to the target voltage range; wherein, the control stage includes a corresponding temperature range, state of charge range, and voltage range one by one.

[0107] In this solution, the control stage is obtained by dividing the charging process of the energy storage device. During the division process, the control stages are sequentially assigned ascending identification numbers from small to large according to the ascending order rule of the charging process from small to large. For example, the control stage can be represented by control stage 1, control stage 2, and control stage 3.

[0108] In this embodiment, the corresponding relationship between the temperature range and the control stage has been pre-planned and determined; the corresponding relationship between the state of charge range and the control stage has been pre-planned and determined; the corresponding relationship between the voltage range and the control stage has been pre-planned and determined.

[0109] Further, the control stage corresponding to the target temperature range, the control stage corresponding to the target state of charge range, and the control stage corresponding to the target voltage range can be determined by looking up in the step charging strategy mapping table.

[0110] S540. When the control stages corresponding to the target temperature range, the target state of charge range, and the target voltage range are the same stage, determine the charging threshold matching the control stage as the target charging threshold adapted to the current charging state of the energy storage device.

[0111] Among them, the matching relationship between the control stage and the charging threshold has been determined in advance.

[0112] In this solution, when the control stages corresponding to the target temperature range, the target state of charge range, and the target voltage range are the same stage, determine the charging threshold matching the control stage, and use this charging threshold as the target charging threshold adapted to the current charging state of the energy storage device.

[0113] S550. When the control stages corresponding to the target temperature range, the target state of charge range, and the target voltage range are different stages, select the control stage with the largest identification number from the control stages corresponding to the target temperature range, the target state of charge range, and the target voltage range as the target control stage, and determine the charging threshold matching the target control stage as the target charging threshold adapted to the current charging state of the energy storage device.

[0114] In this solution, during the charging process, when any one of the battery temperature, the state of charge of the battery, or the charging voltage reaches the preset specified value first, the corresponding target charging threshold will be immediately activated, so as to always control the battery charging process within the safety boundary and ensure charging safety.

[0115] In this solution, when the control stages corresponding to the target temperature range, the target state of charge range, and the target voltage range are different stages, select the control stage with the largest identification number from the control stages corresponding to the target temperature range, the target state of charge range, and the target voltage range as the target control stage, determine the charging threshold matching the target control stage, and use this charging threshold as the target charging threshold adapted to the current charging state of the energy storage device.

[0116] S560. Control the charging process of the energy storage device according to the target charging threshold.

[0117] In the technical solution of the embodiment of the present invention, by obtaining the battery temperature, the state of charge of the battery, and the charging voltage during the charging process of the energy storage device in real time, and determining the target charging threshold adapted to the current charging state of the energy storage device based on the target temperature range in which the battery temperature is located, the target state of charge range in which the state of charge of the battery is located, and the target voltage range in which the charging voltage is located, and then controlling the charging process of the energy storage device according to the target charging threshold. By implementing this technical solution, by monitoring the battery temperature, the state of charge of the battery, and the charging voltage in real time, the charging state of the battery can be accurately grasped. Only inputting a current within a safe range into the battery greatly optimizes the battery boundary limit protection mechanism. The precise control of the target charging threshold effectively prevents the problem of excessive decomposition of the electrolyte caused by too large a current, and effectively guarantees the safety and life of the battery. And it can ensure that the battery always maintains stable performance during the charging process, and avoid the negative impact on the battery performance caused by current fluctuations. Especially in complex situations such as unstable power systems, or sudden access to additional charging power sources, sudden disconnection of loads resulting in current surges, etc., reasonable current limitation can fully play its role to ensure the stable operation of the battery and provide a solid guarantee for user safety.

[0118] Embodiment Five

[0119] Figure 6 It is a flowchart of another charging control method for an energy storage device provided in Embodiment Five of the present invention. The relationship between this embodiment and the above embodiment is a detailed description of the charging threshold determination process. As Figure 6 shown, the method includes:

[0120] S610. For each control stage, obtain each battery temperature within the temperature range, each state of charge of the battery within the state-of-charge range, and each charging voltage within the voltage range.

[0121] In this solution, the control stage is obtained by dividing the charging process of the energy storage device. Each control stage corresponds to a temperature range, a state-of-charge range, and a voltage range respectively.

[0122] In this solution, for each control stage, each battery temperature within the temperature range, each state of charge of the battery within the state-of-charge range, and each charging voltage within the voltage range can be obtained based on the battery management system.

[0123] S620. Take the preset charging current as the independent variable, and take each battery temperature within the temperature range, each state of charge of the battery within the state-of-charge range, and each charging voltage within the voltage range as the dependent variables, and construct an objective function.

[0124] Wherein, the charging current refers to the charging current of the energy storage device.

[0125] In this embodiment, during the charging process of the energy storage device, the magnitude of the charging current affects the heat generated by the battery during charging, thereby changing the battery temperature; the magnitude of the charging current affects the charging speed of the battery, and further affects the change in the state of charge of the battery within a certain period of time; there is a certain relationship between the charging current and the voltage across the battery, and the change in the charging current causes a change in the charging voltage. That is, the magnitude of the charging current affects the battery temperature, the state of charge of the battery, and the charging voltage. Therefore, the charging current is used as the independent variable, and each battery temperature within the temperature range, each state of charge of the battery within the state-of-charge range, and each charging voltage within the voltage range are used as the dependent variables to construct an objective function.

[0126] Among them, the objective function is an expression that describes the mathematical relationship between the charging current and the battery temperature, the state of charge of the battery, and the charging voltage. Through the objective function, the changes in the battery temperature, the state of charge of the battery, and the charging voltage under different charging currents can be predicted. Similarly, the magnitude of the charging current can be predicted based on the magnitudes of the battery temperature, the state of charge of the battery, and the charging voltage.

[0127] Exemplarily, it is assumed that there is the following relationship between the battery temperature T, the state of charge of the battery SOC, the charging voltage V, and the charging current I:

[0128] Battery temperature: T(I)=a1·I + b1, where a1 and b1 are constants determined according to the battery characteristics. For example, a1 = 0.5 (unit: °C / A), b1 = 20 (unit: °C), indicating that for every 1 A increase in the charging current, the battery temperature rises by 0.5 °C, and when the charging current is 0, the initial battery temperature is 20 °C.

[0129] State of charge of the battery: SOC(I)=a2·I + b2, where a2 = 0.1 (unit: % / A), b1 = 20 (unit: %), that is, for every 1 A increase in the charging current, the state of charge of the battery rises by 0.1% per minute, and the initial state of charge of the battery is 20%.

[0130] Charging voltage: V(I)=a3·I + b3, where a3 = 0.2 (unit: V / A), b3 = 3.0 (unit: V), indicating that for every 1 A increase in the charging current, the charging voltage rises by 0.2 V, and the initial charging voltage is 3.0 V.

[0131] Then an objective function F can be constructed to combine these three dependent variables: F(I)=(T(I), SOC(I), V(I))=(a1·I + b1, a2·I + b2, a3·I + b3).

[0132] S630. Based on the objective function, determine the charging threshold that matches the control phase.

[0133] In this solution, through the objective function, the target charging current can be predicted based on the battery temperature, the state of charge of the battery, and the charging voltage, and the charging threshold matching the control stage can be determined according to the target charging current.

[0134] Specifically, a simulation model of the charging system is established using computer software, different charging currents are set in the simulation model for simulation operation, and the simulation results are analyzed to determine the target charging current that optimizes the objective function.

[0135] In this embodiment, the charging current is encoded as a chromosome, and by simulating operations such as selection, crossover, and mutation in the biological genetic process, the target charging current that optimizes the objective function is searched in the solution space.

[0136] Among them, the target charging current can be used as the charging threshold matching the control stage; alternatively, the target charging power can be calculated based on the target charging current, and the target charging power can be used as the charging threshold matching the control stage.

[0137] Optionally, determining the charging threshold matching the control stage based on the objective function includes:

[0138] Based on the objective function, determining a first target charging current corresponding to when the battery temperature reaches a preset target temperature threshold, a second target charging current corresponding to when the state of charge of the battery reaches a preset target state of charge threshold, and a third target charging current corresponding to when the charging voltage reaches a preset target charging voltage threshold;

[0139] Determining the charging threshold matching the control stage according to the smallest target charging current among the first target charging current, the second target charging current, and the third target charging current; or,

[0140] Determining the charging threshold matching the control stage according to the weighted average of the first target charging current, the second target charging current, and the third target charging current.

[0141] Among them, the target temperature threshold, the target state of charge threshold, and the target charging voltage threshold can be set according to the charging control requirements of the energy storage device.

[0142] In this embodiment, the first target charging current is the maximum target charging current among the target charging currents corresponding to when the battery temperature reaches the preset target temperature threshold; the second target charging current is the maximum target charging current among the target charging currents corresponding to when the state of charge of the battery reaches the preset target state of charge threshold; the third target charging current is the maximum target charging current among the target charging currents corresponding to when the charging voltage reaches the preset target charging voltage threshold.

[0143] In this solution, based on the objective function, the first target charging current is determined according to each battery temperature, the second target charging current is determined according to each state of charge of the battery, and the third target charging current is determined according to each charging voltage.

[0144] Furthermore, the minimum target charging current can be selected from the first target charging current, the second target charging current, and the third target charging current, and the charging threshold matching the control stage is determined based on the minimum target charging current.

[0145] In this solution, the first target charging current, the second target charging current, and the third target charging current can also be weighted and averaged to determine the target charging current, and the charging threshold matching the control stage is determined based on the target charging current. Among them, the weights can be set according to the influence of battery temperature, state of charge of the battery, and charging voltage on the charging process of the energy storage device.

[0146] By determining the charging threshold matching the control stage through battery temperature, state of charge of the battery, and charging voltage, and only inputting current within the safe range to the battery, the battery boundary limit protection mechanism is greatly optimized. The attenuation of the battery capacity of the energy storage device is delayed, the safety and performance risks of the energy storage device are avoided to the greatest extent, the stable charging of the energy storage device can be ensured, and the service life of the energy storage device is extended.

[0147] In this solution, for each control stage, after determining the charging threshold matching the control stage, a stepped charging strategy mapping relationship table is constructed based on the temperature range, state of charge range of the battery, voltage range, and charging threshold. And the stepped charging strategy mapping relationship table is stored in the battery management system. Optionally, the stepped charging strategy mapping relationship table is shown in Table 1.

[0148] The technical solution of the embodiment of the present invention constructs an objective function by using the preset charging current as the independent variable and each battery temperature within the temperature range, each state of charge of the battery within the state of charge range of the battery, and each charging voltage within the voltage range as the dependent variables, and then determines the charging threshold matching the control stage based on the objective function. By implementing this technical solution, the charging threshold matching the control stage is determined through battery temperature, state of charge of the battery, and charging voltage, and only current within the safe range is input to the battery, greatly optimizing the battery boundary limit protection mechanism. The attenuation of the battery capacity of the energy storage device is delayed, the safety and performance risks of the energy storage device are avoided to the greatest extent, the stable charging of the energy storage device can be ensured, and the service life of the energy storage device is extended.

[0149] Embodiment Six

[0150] Figure 7 It is a schematic structural diagram of a charging control device for an energy storage device provided in Embodiment Six of the present invention. AsFigure 7 As shown, the device includes:

[0151] A charging state parameter acquisition module 710, configured to acquire the battery temperature, the state of charge of the battery, and the charging voltage during the charging process of the energy storage device in real-time monitoring as the charging state parameters of the energy storage device;

[0152] A target charging threshold determination module 720, configured to determine a target charging threshold adapted to the current charging state of the energy storage device according to the charging state parameters; wherein, the target charging threshold is less than a preset candidate charging threshold; the candidate charging threshold is a protection threshold set during the charging process of the energy storage device;

[0153] A charging control module 730, configured to control the charging process of the energy storage device according to the target charging threshold.

[0154] Optionally, the target charging threshold determination module 720 includes:

[0155] An interval determination unit, configured to determine a target temperature interval in which the battery temperature is located, a target state of charge interval in which the state of charge of the battery is located, and a target voltage interval in which the charging voltage is located;

[0156] A target charging threshold determination unit, configured to determine a target charging threshold adapted to the current charging state of the energy storage device based on the target temperature interval in which the battery temperature is located, the target state of charge interval in which the state of charge of the battery is located, and the target voltage interval in which the charging voltage is located.

[0157] Optionally, the target charging threshold determination unit includes:

[0158] A target charging threshold determination subunit, configured to determine a target charging threshold adapted to the current charging state of the energy storage device according to the target state of charge interval in which the state of charge of the battery is located and the target voltage interval in which the charging voltage is located within each control stage corresponding to the target temperature interval;

[0159] Wherein, each control stage includes a corresponding state of charge interval and voltage interval; the control stages are obtained by dividing the charging process of the energy storage device, and during the division process, the control stages are sequentially assigned ascending identification numbers from small to large according to the ascending order of the charging process from small to large.

[0160] Optionally, the target charging threshold determination subunit is specifically configured to:

[0161] When the control phase corresponding to the target state of charge range of the battery and the control phase corresponding to the target voltage range are the same phase, determine the charging threshold matching the control phase as the target charging threshold adapted to the current charging state of the energy storage device;

[0162] When the control phase corresponding to the target state of charge range of the battery and the control phase corresponding to the target voltage range are different phases, select the control phase with the largest identification serial number from the control phase corresponding to the target state of charge range of the battery and the control phase corresponding to the target voltage range as the target control phase, and determine the charging threshold matching the target control phase as the target charging threshold adapted to the current charging state of the energy storage device.

[0163] Optionally, the target charging threshold determination unit is specifically configured to:

[0164] Determine the control phase corresponding to the target temperature range, the control phase corresponding to the target state of charge range of the battery, and the control phase corresponding to the target voltage range; wherein, each control phase includes a corresponding temperature range, a state of charge range of the battery, and a voltage range;

[0165] When the control phase corresponding to the target temperature range, the control phase corresponding to the target state of charge range of the battery, and the control phase corresponding to the target voltage range are the same phase, determine the charging threshold matching the control phase as the target charging threshold adapted to the current charging state of the energy storage device;

[0166] When the control phase corresponding to the target temperature range, the control phase corresponding to the target state of charge range of the battery, and the control phase corresponding to the target voltage range are different phases, select the control phase with the largest identification serial number from the control phase corresponding to the target temperature range, the control phase corresponding to the target state of charge range of the battery, and the control phase corresponding to the target voltage range as the target control phase, and determine the charging threshold matching the target control phase as the target charging threshold adapted to the current charging state of the energy storage device.

[0167] Optionally, the target charging threshold determination unit further includes:

[0168] The control phase information acquisition subunit is configured to, for each control phase, acquire each battery temperature within the temperature range, each state of charge of the battery within the state of charge range, and each charging voltage within the voltage range;

[0169] The objective function construction subunit is configured to construct an objective function by using a preset charging current as an independent variable and using each battery temperature within the temperature range, each battery state of charge within the battery state of charge range, and each charging voltage within the voltage range as dependent variables;

[0170] The charging threshold determination subunit is configured to determine a charging threshold matching the control stage based on the objective function.

[0171] Optionally, the charging threshold determination subunit is specifically configured to:

[0172] Based on the objective function, determine a first target charging current corresponding to when the battery temperature reaches a preset target temperature threshold, a second target charging current corresponding to when the battery state of charge reaches a preset target battery state of charge threshold, and a third target charging current corresponding to when the charging voltage reaches a preset target charging voltage threshold;

[0173] Determine the charging threshold matching the control stage according to the smallest target charging current among the first target charging current, the second target charging current, and the third target charging current; or,

[0174] Determine the charging threshold matching the control stage according to the weighted average value of the first target charging current, the second target charging current, and the third target charging current.

[0175] Optionally, the charging control module 730 is specifically configured to:

[0176] During the charging process of the energy storage device, monitor the charging current signal in real time;

[0177] If the charging current signal is an abnormal current signal, control the charging process of the energy storage device according to the target charging threshold; wherein, the abnormal current signal is a signal exceeding the first charging current range; the first charging current range is determined according to the candidate charging threshold;

[0178] During the process of controlling the charging process of the energy storage device according to the target charging threshold, if the charging current signal is a normal current signal, control the charging process of the energy storage device according to the candidate charging threshold; wherein, the normal current signal is a signal within the second charging current range; the second charging current range is determined according to the target charging threshold; the upper limit of the second charging current range is less than the lower limit of the first charging current range.

[0179] Optionally, when the energy storage device is any one of a lithium-ion battery, a lead-acid battery, and a nickel-metal hydride battery, the statistical relationship between the target charging threshold and the battery temperature includes:

[0180] The target temperature range in which the battery temperature is located includes a first temperature range, a second temperature range, and a third temperature range; the upper limit of the first temperature range is less than the lower limit of the second temperature range; the upper limit of the second temperature range is less than the lower limit of the third temperature range;

[0181] The charging threshold corresponding to the first temperature range is less than the charging threshold corresponding to the second temperature range; the charging threshold corresponding to the third temperature range is less than the charging threshold corresponding to the second temperature.

[0182] The charging control device of an energy storage device provided by an embodiment of the present invention can execute the charging control method of an energy storage device provided by any embodiment of the present invention, and has function modules and beneficial effects corresponding to the execution of the method.

[0183] Embodiment Seven

[0184] Figure 8 FIG. shows a schematic structural diagram of an electronic device 10 that can be used to implement an embodiment of the present invention. The electronic device is intended to represent various forms of digital computers, such as, a laptop computer, a desktop computer, a workbench, a personal digital assistant, a server, a blade server, a mainframe computer, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as, a personal digital processor, a cellular phone, a smart phone, a wearable device (such as a helmet, glasses, a watch, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or claimed herein.

[0185] As Figure 8 shown, the electronic device 10 includes at least one processor 11, and a memory communicatively connected to the at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc. Among them, the memory stores a computer program executable by the at least one processor. The processor 11 can execute various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 into the random access memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 10 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other through a bus 14. The input / output (I / O) interface 15 is also connected to the bus 14.

[0186] Multiple components in the electronic device 10 are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a disk, an optical disc, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices via a computer network such as the Internet and / or various telecommunication networks.

[0187] The processor 11 can be various general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. The processor 11 executes the various methods and processes described above, such as a charging control method for an energy storage device.

[0188] In some embodiments, a charging control method for an energy storage device can be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as the storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed onto the electronic device 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the charging control method for an energy storage device described above can be executed. Alternatively, in other embodiments, the processor 11 can be configured to execute a charging control method for an energy storage device by any other suitable means (e.g., by means of firmware).

[0189] The various embodiments of the systems and technologies described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems on a chip (SOCs), complex programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments can include: being implemented in one or more computer programs, which can be executed and / or interpreted on a programmable system including at least one programmable processor, and the programmable processor can be a special or general programmable processor, and can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit the data and instructions to the storage system, the at least one input device, and the at least one output device.

[0190] A computer program for implementing the method of the present invention can be written in any combination of one or more programming languages. These computer programs can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when executed by the processor, the computer programs cause the functions / operations specified in the flowchart and / or block diagram to be implemented. The computer programs can be executed entirely on the machine, partially on the machine, executed partially on the machine as an independent software package and partially on a remote machine, or executed entirely on a remote machine or server.

[0191] In the context of the present invention, a computer-readable storage medium can be a tangible medium that can contain or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. The computer-readable storage medium can include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing. Alternatively, the computer-readable storage medium can be a machine-readable signal medium. More specific examples of the machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0192] In order to provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and a pointing device (e.g., a mouse or a trackball) through which the user can provide input to the electronic device. Other kinds of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, voice input, or tactile input).

[0193] The systems and techniques described herein can be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system can be interconnected with each other by digital data communication in any form or medium (e.g., a communication network). Examples of communication networks include: local area network (LAN), wide area network (WAN), blockchain network, and the Internet.

[0194] A computing system can include a client and a server. The client and the server are generally remote from each other and typically interact through a communication network. The client-server relationship is created by computer programs that run on the respective computers and have a client-server relationship with each other. The server can be a cloud server, also known as a cloud computing server or a cloud host, which is a host product in the cloud computing service system, and solves the defects of difficult management and weak business scalability existing in traditional physical hosts and VPS services.

[0195] It should be understood that various forms of the processes shown above can be used, with steps reordered, added, or deleted. For example, the steps recited in the present invention can be executed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved, and no limitation is made herein.

[0196] The above specific embodiments do not constitute a limitation on the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A charging control method for an energy storage device, characterized in that, Including: Obtaining the battery temperature, state of charge (SOC) of the battery, and charging voltage during the charging process of the energy storage device in real time as the charging state parameters of the energy storage device; Determining a target charging threshold adapted to the current charging state of the energy storage device according to the charging state parameters; wherein, the target charging threshold is less than a preset candidate charging threshold; the candidate charging threshold is a protection threshold set during the charging process of the energy storage device; Controlling the charging process of the energy storage device according to the target charging threshold.

2. The method according to claim 1, wherein Determining a target charging threshold adapted to the current charging state of the energy storage device according to the charging state parameters includes: Determining a target temperature range in which the battery temperature is located, a target SOC range in which the SOC of the battery is located, and a target voltage range in which the charging voltage is located; Based on the target temperature range in which the battery temperature is located, the target SOC range in which the SOC of the battery is located, and the target voltage range in which the charging voltage is located, determining a target charging threshold adapted to the current charging state of the energy storage device.

3. The method according to claim 2, wherein Based on the target temperature range in which the battery temperature is located, the target SOC range in which the SOC of the battery is located, and the target voltage range in which the charging voltage is located, determining a target charging threshold adapted to the current charging state of the energy storage device includes: Within each control stage corresponding to the target temperature range, determining a target charging threshold adapted to the current charging state of the energy storage device according to the target SOC range in which the SOC of the battery is located and the target voltage range in which the charging voltage is located; Wherein, each control stage includes a corresponding SOC range and voltage range; the control stages are obtained by dividing the charging process of the energy storage device, and during the division process, the control stages are sequentially assigned ascending identification numbers from small to large according to the ascending order of the charging process from small to large.

4. The method according to claim 3, characterized in that, Determining a target charging threshold adapted to the current charging state of the energy storage device according to the target SOC range in which the SOC of the battery is located and the target voltage range in which the charging voltage is located includes: When the control stage corresponding to the target SOC range and the control stage corresponding to the target voltage range are the same stage, determining the charging threshold matching the control stage as the target charging threshold adapted to the current charging state of the energy storage device; When the control stage corresponding to the target SOC range and the control stage corresponding to the target voltage range are different stages, selecting the control stage with the largest identification number from the control stage corresponding to the target SOC range and the control stage corresponding to the target voltage range as the target control stage, and determining the charging threshold matching the target control stage as the target charging threshold adapted to the current charging state of the energy storage device.

5. The method according to claim 2, characterized in that, Based on the target temperature range in which the battery temperature is located, the target state of charge range in which the state of charge of the battery is located, and the target voltage range in which the charging voltage is located, determining a target charging threshold adapted to the current charging state of the energy storage device includes: Determining the control stage corresponding to the target temperature range, the control stage corresponding to the target state of charge range, and the control stage corresponding to the target voltage range; wherein, each control stage includes a corresponding temperature range, state of charge range, and voltage range; When the control stage corresponding to the target temperature range, the control stage corresponding to the target state of charge range, and the control stage corresponding to the target voltage range are the same stage, determining the charging threshold matching the control stage as the target charging threshold adapted to the current charging state of the energy storage device; When the control stage corresponding to the target temperature range, the control stage corresponding to the target state of charge range, and the control stage corresponding to the target voltage range are different stages, selecting the control stage with the largest identification serial number from the control stage corresponding to the target temperature range, the control stage corresponding to the target state of charge range, and the control stage corresponding to the target voltage range as the target control stage, and determining the charging threshold matching the target control stage as the target charging threshold adapted to the current charging state of the energy storage device.

6. The method according to claim 4 or 5, characterized in that, The determination process of the charging threshold includes: For each control stage, obtaining each battery temperature within the temperature range, each state of charge of the battery within the state of charge range, and each charging voltage within the voltage range; Taking the preset charging current as the independent variable, and taking each battery temperature within the temperature range, each state of charge of the battery within the state of charge range, and each charging voltage within the voltage range as the dependent variables, constructing an objective function; Based on the objective function, determining the charging threshold matching the control stage.

7. The method according to claim 6, characterized in that, Based on the objective function, determining the charging threshold matching the control stage includes: Based on the objective function, determining a first target charging current corresponding to when the battery temperature reaches a preset target temperature threshold, a second target charging current corresponding to when the state of charge of the battery reaches a preset target state of charge threshold, and a third target charging current corresponding to when the charging voltage reaches a preset target charging voltage threshold; Determining the charging threshold matching the control stage according to the smallest target charging current among the first target charging current, the second target charging current, and the third target charging current; or, Determining the charging threshold matching the control stage according to the weighted average value of the first target charging current, the second target charging current, and the third target charging current.

8. The method according to claim 1, characterized in that, Controlling the charging process of the energy storage device according to the target charging threshold includes: During the charging process of the energy storage device, monitoring the charging current signal in real time; If the charging current signal is an abnormal current signal, the charging process of the energy storage device is controlled according to the target charging threshold; wherein, the abnormal current signal is a signal exceeding the first charging current range; the first charging current range is determined according to the candidate charging threshold; During the process of controlling the charging process of the energy storage device according to the target charging threshold, if the charging current signal is a normal current signal, the charging process of the energy storage device is controlled according to the candidate charging threshold; wherein, the normal current signal is a signal within the second charging current range; the second charging current range is determined according to the target charging threshold; the upper limit of the second charging current range is less than the lower limit of the first charging current range.

9. The method according to claim 1, wherein When the energy storage device is any one of a lithium-ion battery, a lead-acid battery, and a nickel-metal hydride battery, the statistical relationship between the target charging threshold and the battery temperature includes: The target temperature range in which the battery temperature is located includes a first temperature range, a second temperature range, and a third temperature range; the upper limit of the first temperature range is less than the lower limit of the second temperature range; the upper limit of the second temperature range is less than the lower limit of the third temperature range; The charging threshold corresponding to the first temperature range is less than the charging threshold corresponding to the second temperature range; the charging threshold corresponding to the third temperature range is less than the charging threshold corresponding to the second temperature.

10. A charging control device for an energy storage device, characterized in that, Including: A charging state parameter acquisition module, configured to acquire the battery temperature, the state of charge of the battery, and the charging voltage during the charging process of the energy storage device in real-time monitoring as the charging state parameters of the energy storage device; A target charging threshold determination module, configured to determine a target charging threshold adapted to the current charging state of the energy storage device according to the charging state parameters; wherein, the target charging threshold is less than a preset candidate charging threshold; the candidate charging threshold is a protection threshold set during the charging process of the energy storage device; A charging control module, configured to control the charging process of the energy storage device according to the target charging threshold.

11. An electronic device, characterized in that, The electronic device includes: At least one processor; and a memory communicatively connected to the at least one processor; wherein, the memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor, so that the at least one processor can execute a charging control method for an energy storage device according to any one of claims 1-9.

12. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable the processor to execute a charging control method for an energy storage device according to any one of claims 1-9 when executed.

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