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

Abstract

The invention discloses a charging control method and device of energy storage equipment, the energy storage equipment and a medium. The method comprises the steps that a target value of an input voltage loop is adjusted to obtain input currents under multiple different input voltages, and the input voltage loop is used for adjusting the input voltages in the direction close to the target value; based on the fluctuation information of the multiple input currents, the type of the connected external power supply is determined, and the type comprises a constant-current charging power supply or a variable-current charging power supply. By acquiring the input current under different input voltages, the type of the connected external power supply is quickly and accurately determined, so that the energy storage equipment can be charged by using a matched charging strategy according to the type of the external power supply, and the charging safety and performance are ensured.

Description

Technical Field

[0001] The present application belongs to the technical field of charging of energy storage devices, and in particular, relates to a charging control method for energy storage devices, a charging control device, an energy storage device, and a computer-readable storage medium. Background Art

[0002] With the development of society and the improvement of people's living standards, mobile energy storage now just meets people's needs for short-distance travel. Mobile energy storage is becoming more and more popular, and the market demand for detailed mobile energy storage products is becoming more and more obvious.

[0003] In order to realize a multi-functional interface, the same interface can be charged through different charging devices, and the charging requirements of different charging devices are generally different. Therefore, how to accurately identify the type of charging device is the key to ensuring the safety and performance of charging. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a charging control method, a charging control device, an energy storage device, and a computer-readable storage medium, which can accurately distinguish the type of external power supply by adjusting the target value of the input voltage loop to obtain the fluctuation of the input current under different input voltages, thereby ensuring the safety and performance of charging.

[0005] In a first aspect, the present application provides a charging control method for an energy storage device, comprising:

[0006] Adjusting a target value of an input voltage loop to obtain input currents under a plurality of different input voltages, wherein the input voltage loop is used to adjust the input voltage in a direction close to the target value;

[0007] Based on the fluctuation information of the plurality of input currents, the type of the connected external power source is determined, the type comprising a constant current charging power source or a variable current charging power source.

[0008] In a second aspect, the present application provides a charging control device. The charging control device includes:

[0009] An adjustment module, used for adjusting a target value of an input voltage loop to obtain input currents under a plurality of different input voltages, wherein the input voltage loop is used for adjusting the input voltage in a direction close to the target value;

[0010] The determination module is used to determine the type of the connected external power supply based on the fluctuation information of the multiple input currents, and the type includes a constant current charging power supply or a variable current charging power supply.

[0011] In a third aspect, the present application provides an energy storage device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the charging control method of the energy storage device when executing the program.

[0012] In a fourth aspect, the present application provides a non-transitory computer-readable storage medium having a computer program stored thereon, which implements the above-mentioned charging control method when executed by a processor.

[0013] In the charging control method, charging control device, energy storage device, and computer-readable storage medium provided in the embodiments of the present application, the input voltage is adjusted in the direction close to the target value by adjusting the target value of the input voltage loop, so that the input current under different input voltages can be obtained. For a constant current charging power supply (such as a vehicle fast charge), the input current is constant; while for a variable current charging power supply (such as a photovoltaic panel or other power generation equipment, the charging current will also fluctuate under different input voltages). Therefore, by calculating the fluctuation information of the input current under different input voltages, it is possible to determine whether the input current fluctuates, thereby accurately determining the type of external power supply.

[0014] In this way, by obtaining the input current under different input voltages, the type of the connected external power source can be quickly and accurately determined, so that the energy storage device can be charged using a matching charging strategy according to the type of the external power source, ensuring the safety and performance of charging.

[0015] Additional aspects and advantages of the embodiments of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 It is a schematic diagram of an application scenario of a charging control method provided in some embodiments of the present application;

[0018] Figure 2 is a first flow chart of a charging control method provided in some embodiments of the present application;

[0019] Figure 3 is a second flow chart of the charging control method provided in some embodiments of the present application;

[0020] Figure 4 is a third flow chart of a charging control method provided in certain embodiments of the present application;

[0021] Figure 5is a fourth flow chart of a charging control method provided in certain embodiments of the present application;

[0022] Figure 6 is a fifth flow chart of a charging control method provided in certain embodiments of the present application;

[0023] Figure 7 is a sixth flow chart of a charging control method provided in certain embodiments of the present application; and

[0024] Figure 8 It is a module schematic diagram of a charging control device provided in certain embodiments of the present application. DETAILED DESCRIPTION

[0025] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0026] See also Figure 1 , Figure 1 1 is an application scenario diagram of a charging control method for an energy storage device provided in an embodiment of the present application. The application scenario provided in the present application includes a terminal 100, an energy storage device 200 and a cloud 300.

[0027] The terminal 100 can directly establish a communication connection with the energy storage device 200, or access the cloud 300 through the network, and then indirectly achieve a wireless connection with the energy storage device 200 connected to the cloud 300 through the cloud 300. The cloud 300 and the energy storage device 200 can communicate through the MQTT protocol (Message Queuing Telemetry Transport). MQTT is a lightweight communication protocol based on the publish / subscribe model, which is particularly suitable for devices with limited resources and low bandwidth, high latency or unreliable network conditions.

[0028] Optionally, when at least one of the terminal 100 or the energy storage device 200 is disconnected from the network, the terminal 100 and the energy storage device 200 directly establish a communication connection by wireless communication or wired communication, and the wireless connection includes Bluetooth communication, near field communication protocol (zigbee) communication or infrared communication.

[0029] Among them, Bluetooth connection communication (bluetooth) and near field communication protocol (zigbee) need to establish a communication connection before communication. Infrared communication only requires the terminal 100 to set up an infrared transmitter and the energy storage device 200 to set up an infrared receiver. The terminal 100 transmits modulated infrared light, and then the energy storage device 200 demodulates the infrared light to obtain the control instructions sent by the terminal 100, so that the operation control of the energy storage device 200 can be achieved without establishing a communication connection.

[0030] The terminal 100 may include, but is not limited to, smart phones (such as Android phones, IOS phones, etc.), tablet computers, laptop computers, desktop computers, smart speakers, smart watches, portable personal computers, mobile Internet devices (Mobile Internet Devices, MID for short), intelligent voice interaction devices, smart home appliances, vehicle-mounted terminals, aircraft, wearable devices, etc., and the embodiments of the present application are not limited to this.

[0031] The energy storage device 200 refers to a device capable of storing power, and is generally provided with a rechargeable battery. The battery in the energy storage power supply stores a large amount of power, and when needed, the energy storage power supply outputs the electric energy stored in the battery for use.

[0032] The cloud 300 may be a server. The server may be an independent physical server, or a server cluster or distributed system composed of multiple physical servers, or a cloud server that provides basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communications, middleware services, domain name services, security services, CDN (Content Delivery Network), and big data and artificial intelligence platforms, etc., which is not limited in the embodiments of the present application.

[0033] The charging control method of the energy storage device of the present application can be implemented by the energy storage device, or the energy storage device can be implemented in cooperation with at least one of the terminal and the server, such as the energy storage device uploading the current operation information (such as input voltage, input current, etc.) to at least one of the terminal and the server, and then at least one of the terminal and the server issues a control instruction to control the energy storage device to perform corresponding operations, such as adjusting the target value of the input voltage loop, so as to obtain the input current under different input voltages, and then at least one of the terminal and the server can calculate the fluctuation information of multiple input currents, so as to determine the type of external power supply connected to the energy storage device and send it to the energy storage device, and the energy storage device executes the corresponding charging control strategy based on the type of external power supply.

[0034] Based on the introduction of the above-mentioned related scenarios, the embodiment of the present application provides a charging control method, which is described in detail below:

[0035] See also Figure 2 , an embodiment of the present application provides a charging control method running on a terminal, the method is implemented by step 011 and step 012, which are described in detail below.

[0036] Step 011: Adjust the target value of the input voltage loop to obtain input currents under multiple different input voltages. The input voltage loop is used to adjust the input voltage in a direction close to the target value.

[0037] The input voltage loop refers to a closed-loop feedback controller (such as a PID controller, which adjusts the output of the controller through three control items: proportional (P), integral (I) and derivative (D) to achieve stability and fast response) used to control the input voltage of energy storage devices (such as battery packs, supercapacitors, etc.) during the charging process. The main purpose of the input voltage loop is to ensure that the energy storage device can work safely and efficiently during the charging process, and to maintain a stable charging process when the input voltage fluctuates.

[0038] The input voltage loop can adjust the input voltage of the energy storage device to approach the target value based on the set target value, and perform feedback control by detecting the adjusted input voltage. If the current input voltage is greater than the target value, after reducing the input voltage based on the preset step length, it is detected that the adjusted input voltage is still greater than the target value, then the input voltage will continue to be reduced based on the preset step length; until the input voltage is reduced based on the preset step length, the reduced input voltage reaches the target value or the difference with the target value is less than the threshold, then the adjustment will be stopped.

[0039] When the input voltage fluctuates or the target value changes, the feedback control of the input voltage loop will be triggered again, so that the input voltage is always close to the target value, ensuring the stability of the input voltage.

[0040] The input voltage refers to the charging voltage when the external power source is connected for charging.

[0041] The input current refers to the charging current of the external power input.

[0042] Specifically, when an external power source is connected, the input voltage can be brought close to the target value by adjusting the target value of the input voltage loop, so that input currents under different input voltages can be obtained in the process of approaching.

[0043] It can be understood that the number of adjustments and the adjustment amplitude of the target value can be determined based on the required number of input currents and the span of the input voltage (i.e., the difference between the maximum input voltage and the minimum input voltage). The more input currents there are and the larger the span of the input voltage, the more accurate the waveform information calculated from the multiple input currents will generally be.

[0044] For example, the amount of input current is positively correlated with the number of adjustments and the adjustment range of the target value. That is, the more the amount of input current is required, the more the number of adjustments of the target value and / or the larger the adjustment range. For another example, the span of input voltage is positively correlated with the number of adjustments and the adjustment range of the target value. That is, the larger the span of input voltage is, the more the number of adjustments of the target value and / or the larger the adjustment range.

[0045] Optionally, the input current can be obtained by sampling a sampling resistor. For example, the sampling resistor is set on the charging circuit where the input current is located, and the input current is calculated by detecting the voltage at two ends of the sampling resistor and the resistance of the sampling resistor itself.

[0046] Optionally, the input voltage may be adjusted by a pulse width modulation (PWM) method, and the effective charging time may be controlled by adjusting the on-time of the switch element, thereby adjusting the input voltage and the input current.

[0047] See also Figure 3 In some embodiments, step 011: adjusting the target value of the input voltage loop comprises:

[0048] Step 0111: Adjust the target value toward a direction close to a preset minimum tracking voltage.

[0049] The minimum tracking voltage may be the minimum charging voltage of a variable current charging power source (such as a photovoltaic panel). That is, as long as the photovoltaic panel is connected to the energy storage device, it can be charged at the minimum charging voltage regardless of the power generated.

[0050] Specifically, when an external power source is connected, the input voltage at this time is the open circuit voltage of the external power source, which is the maximum input voltage that can be achieved during charging.

[0051] Therefore, in order to obtain input currents under multiple different input voltages, the target value can be adjusted toward a preset minimum tracking voltage. If the target value is greater than the minimum tracking voltage, the target value is lowered, and vice versa.

[0052] Optionally, when an external power source is connected, the input voltage can be traversed from the maximum tracking voltage to the minimum tracking voltage. At this time, the span of the input voltage reaches the maximum, and the number of input currents obtained is also the largest, so as to facilitate the subsequent determination of the type of external power source based on the fluctuation of multiple input currents. And continuously reducing the input voltage can also ensure charging safety.

[0053] See also Figure 4 In some embodiments, step 011: adjusting the target value of the input voltage loop comprises:

[0054] Step 0112: Based on a preset charging strategy, adjust the target value of the input voltage loop so that the charging power of the energy storage device reaches the maximum power.

[0055] Optionally, the preset charging strategy may be an MPPT (Maximum Power Point Tracking) charging strategy.

[0056] MPPT is a method used to optimize the energy conversion efficiency of photovoltaic panels, which aims to ensure that photovoltaic panels can output power to the maximum under various lighting conditions. By continuously adjusting the input voltage and current of the photovoltaic panel, it always works at the maximum power point, thereby improving the energy capture efficiency.

[0057] Specifically, when the energy storage device is charging, it can be charged by default with the MPPT charging strategy. At this time, the charging power of the energy storage device can be continuously adjusted by adjusting the target value of the input voltage loop, so that the charging power changes in the direction of increase until it reaches the maximum power point under the current power generation state.

[0058] For example, when the photovoltaic panel is connected to the energy storage device, the energy storage device will continuously adjust the target value of the input voltage loop so that the input voltage is continuously reduced from the maximum open circuit voltage when connected. At this time, the charging power will generally continue to increase until it reaches a peak value, and then it will no longer increase. At this time, the input voltage corresponding to the maximum charging power is found. After that, the input voltage corresponding to the maximum charging power is maintained for charging to ensure the charging efficiency. After the power generation state of the photovoltaic panel (such as changes in light, power generation) changes, it is necessary to re-track the input voltage corresponding to the maximum charging power. In this way, the cycle is repeated to ensure that the photovoltaic panel can be charged at the corresponding maximum charging power under different power generation states.

[0059] When charging with the MPPT charging strategy, the input current under different input voltages can also be obtained, so as to facilitate the subsequent determination of the type of external power source based on the fluctuation of the input current, so as to adjust or maintain the current charging strategy.

[0060] Step 012: Based on the fluctuation information of multiple input currents, determine the type of the connected external power source, which includes a constant current charging power source or a variable current charging power source.

[0061] The fluctuation information is used to characterize the fluctuation of the input current within a period of time.

[0062] Among them, the external power supply refers to a device outside the energy storage device that is used to provide electrical energy to charge the energy storage device.

[0063] Among them, constant current charging power supply refers to a power supply that provides a constant current throughout the charging process. This method is usually used in the fast charging stage of the battery, which can ensure that the battery can be charged at the maximum allowable current in the early stage of charging, thereby speeding up the charging speed. For example, in order to achieve fast charging, vehicle fast charging generally uses constant current charging.

[0064] For a constant current charging power supply, it is only necessary to ensure that the input voltage does not exceed the maximum charging voltage of the constant current charging power supply to avoid the constant current charging power supply automatically stopping charging due to its own safety strategy. This can maintain constant current charging and achieve the best charging performance.

[0065] Among them, variable current charging power supply means that during the charging process, the current provided by the charging power supply changes with time or battery status. This charging method can adjust the charging current according to the actual needs of the battery to improve charging efficiency and safety.

[0066] For example, for photovoltaic panels, since the power generation is constantly fluctuating, the energy storage device is generally charged based on the corresponding preset charging strategy.

[0067] Optionally, when it is determined that the type of the external power supply is a variable current charging power supply, the target value of the input voltage loop is adjusted based on a preset charging strategy (such as an MPPT charging side column) so that the charging power of the energy storage device reaches the maximum power, thereby ensuring the charging performance under the variable current charging power supply; when it is determined that the type of the external power supply is a constant current charging power supply, the target value of the input voltage loop is adjusted based on the open circuit voltage when the external power supply is connected, so that the actual input voltage is less than the open circuit voltage, that is, charging is performed with an input voltage less than the open circuit voltage, thereby ensuring the charging performance under the constant current charging power supply.

[0068] Specifically, after obtaining the input current under multiple input voltages, the fluctuation information of the input current can be calculated based on the multiple input currents. Based on the fluctuation information, the type of the connected external power supply can be quickly determined. If the fluctuation information indicates that the fluctuation of the input current is more severe, the type of the external power supply can be determined to be a variable current charging power supply. If the fluctuation information indicates that the fluctuation of the input current is relatively slight, the type of the external power supply can be determined to be a constant current charging power supply.

[0069] Whether the fluctuation is severe or mild can be judged based on the preset experience value. The corresponding experience values ​​are different based on the fluctuation information calculated in different ways. The following examples introduce various methods for calculating fluctuation information. Other methods for calculating fluctuation information can also be applied to this application. For the sake of brevity, they are not listed one by one here.

[0070] See also Figure 5 , for example, step 012 includes:

[0071] Step 0121: obtaining a first input current corresponding to an input voltage matching a determination voltage, and obtaining a second input current corresponding to an input voltage matching a minimum tracking voltage, wherein the determination voltage is determined based on a preset minimum tracking voltage and an open circuit voltage when an external power source is connected;

[0072] Step 0122: Determine the type of the external power source based on the first input current and the second input current.

[0073] Specifically, a determination voltage (such as determined based on the maximum tracking voltage and the minimum tracking voltage, such as the average of the two) and a minimum tracking voltage (which can be determined based on the lowest charging voltage of the variable current charging power supply (such as a photovoltaic panel)) can be set, and the input currents corresponding to the determination voltage and the minimum tracking voltage can be obtained respectively, and then based on the input currents of the two, the fluctuation information can be quickly determined. Among them, the maximum tracking voltage can be the open circuit voltage when the external power supply is connected.

[0074] The input current corresponding to the judgment voltage may be the input current corresponding to the input voltage matched by the judgment voltage. It is understandable that due to the sampling accuracy and the adjustment accuracy of the input voltage, the input voltage may not reach the judgment voltage, but bypass the judgment voltage after reaching a voltage value near the judgment voltage. Therefore, the input voltage matched by the judgment voltage may be a voltage range, and the input current sampled within the voltage range can be used as the input current corresponding to the judgment voltage.

[0075] The minimum tracking voltage is generally a voltage that can be reached, so the input current obtained by directly sampling the minimum tracking voltage can be obtained.

[0076] See also Figure 6 Optionally, step 0122 includes:

[0077] Step 01221: Calculate a fluctuation value based on the first input current and the second input current;

[0078] Step 01222: when the fluctuation value is greater than a preset fluctuation threshold, determining that the type of the external power source is a variable current charging power source;

[0079] Step 01223: When the fluctuation value is less than the preset fluctuation threshold, determine that the type of the external power source is a constant current charging power source.

[0080] Specifically, after the first input current and the second input current are acquired, the type of the external power source is determined based on the first input current and the second input current.

[0081] When determining the type of the external power source based on the first input current and the second input current, the fluctuation value may be first calculated based on the first input current and the second input current; and then the type of the external power source may be determined based on the fluctuation value and a preset fluctuation threshold.

[0082] Exemplarily, the fluctuation value may be calculated based on at least one of the following formulas:

[0083] (1) F = abs((I1-I2) / I1);

[0084] (1)F=abs((I1-I2) / (V1-Vmin));

[0085] Among them, F is the fluctuation value, I1 is the first input current, I2 is the second input current, V1 is the judgment voltage, and Vmin is the minimum tracking voltage.

[0086] As shown in formula (1), the ratio of the difference between the current corresponding to the judgment voltage and the minimum tracking voltage to the input current corresponding to the judgment voltage can be calculated. This ratio is positively correlated with the degree of fluctuation of the input current. Generally speaking, when charging with a constant current charging power supply, the ratio is basically close to 0. Therefore, through this ratio, it is possible to quickly determine whether the fluctuation of the input current is severe or slight by combining it with the preset fluctuation threshold (such as 0.1 to avoid errors). If the ratio is greater than the preset fluctuation threshold, it is determined that the fluctuation of the input current is severe (that is, the type of the external power supply is a variable current charging power supply), otherwise it is determined that the fluctuation of the input current is slight (that is, the type of the external power supply is a constant current charging power supply).

[0087] As shown in formula (2), the ratio of the difference between the current corresponding to the judgment voltage and the minimum tracking voltage to the difference between the judgment voltage and the minimum tracking voltage can be calculated, and this ratio is positively correlated with the degree of fluctuation of the input current. Generally speaking, when charging with a constant current charging power supply, this ratio is basically close to 0. Therefore, through this ratio and the preset fluctuation threshold (such as 0.05, 0.1, etc. to avoid errors), it can be quickly determined whether the fluctuation of the input current is severe or slight. If the ratio is greater than the preset fluctuation threshold, it is determined that the fluctuation of the input current is severe (that is, the type of the external power supply is a variable current charging power supply), otherwise it is determined that the fluctuation of the input current is slight (that is, the type of the external power supply is a constant current charging power supply).

[0088] For another example, the variance of multiple input currents can be calculated as the fluctuation information of the input current. It can be understood that the larger the variance, the more severe the fluctuation, and the smaller the variance, the milder the fluctuation. Therefore, the fluctuation of the input current can be quickly determined by the variance, thereby quickly determining the type of the external power supply connected.

[0089] Optionally, when the fluctuation is large (such as the variance is greater than the preset variance), the type of the external power supply is determined to be a variable current charging power supply, and when the fluctuation is small (such as the variance is less than or equal to the preset variance), the type of the external power supply is determined to be a constant current charging power supply.

[0090] In the charging control method of the energy storage device of the present application, the input voltage is adjusted in the direction close to the target value by adjusting the target value of the input voltage loop, so that the input current under different input voltages can be obtained. For a constant current charging power supply (such as a vehicle fast charge), the input current is constant; while for a variable current charging power supply (such as a photovoltaic panel or other power generation equipment, the charging current will also fluctuate under different input voltages). Therefore, by calculating the fluctuation information of the input current under different input voltages, it is possible to determine whether the input current fluctuates, thereby accurately determining the type of external power supply.

[0091] In this way, by obtaining the input current under different input voltages, the type of the connected external power source can be quickly and accurately determined, so that the energy storage device can be charged using a matching charging strategy according to the type of the external power source, ensuring the safety and performance of charging.

[0092] See also Figure 7 In some embodiments, step 011 further includes:

[0093] Step 0113: adjusting the target value of the input voltage loop, and determining the target output value by making the output values ​​of the input voltage loop, the output voltage loop and the output current loop compete with each other, wherein the target output value is the minimum value among the multiple output values;

[0094] Step 0114: Determine the target value of the input current loop based on the target output value, and adjust the duty cycle of the pulse width modulation according to the output value of the input current loop. The input voltage loop, output voltage loop, output current loop and input current loop are all closed-loop feedback controllers.

[0095] Specifically, when the energy storage device is performing charging control, in addition to the input current loop, it is also provided with an output voltage loop, an output current loop, and an input current loop.

[0096] The input voltage loop, output voltage loop, output current loop and input current loop are all closed-loop feedback controllers (such as PID controllers). By setting the target values ​​of the input voltage loop, output voltage loop, output current loop and input current loop, the input voltage, output voltage, output current and input current can be adjusted so that each is maintained near the corresponding target value.

[0097] Since energy storage devices have different usage scenarios, the motherboard sets different target values ​​for different closed-loop feedback controllers in different scenarios to meet charging needs. Therefore, in order to avoid conflicts between different closed-loop feedback controllers, the output values ​​of the input voltage loop, output voltage loop, and output current loop are used for competitive control, and the target output value that successfully competes is used to control the input current loop, thereby meeting the user's charging speed and safety requirements in different scenarios as much as possible.

[0098] Among them, the output values ​​of the input voltage loop, the output voltage loop and the output current loop are all the target values ​​of the input current loop. The target output value of the successful competition can be the minimum value among the output values ​​of multiple closed-loop feedback controllers. In this case, the target value of the input current loop is set to be small, which can ensure charging safety. Alternatively, the target output value of the successful competition can be the maximum value among the output values ​​of multiple closed-loop feedback controllers. In this case, the target value of the input current loop is set to be large, and charging can be performed with a larger input current to ensure charging speed.

[0099] Optionally, when the target output value reaches a set threshold value corresponding to the input voltage loop (generally determined based on a preset safety threshold range of the energy storage device), the duty cycle of the pulse width modulation is stopped from being adjusted.

[0100] That is to say, the target output value reaches the limit that the input current loop can adjust. At this time, in order to avoid the input current exceeding the limit value and causing safety problems, the duty cycle of the pulse width modulation can be stopped from being adjusted based on the target output value, thereby avoiding the input current exceeding the set threshold after the duty cycle of the pulse width modulation is adjusted.

[0101] Alternatively, after the target output value reaches a set threshold, the target value of the input current loop is adaptively adjusted using a value within a safety threshold range, thereby ensuring charging safety.

[0102] Finally, after determining the target value of the input current loop, the duty cycle of the pulse width modulation can be adjusted by the output value of the input current loop, so that the input current changes toward the target value.

[0103] The present application embodiment also provides a charging control device 300, which is used to execute the steps in the charging control method for energy storage equipment. Figure 8 , Figure 8: is a module diagram of a charging control device 300 provided in an embodiment of the present application. The charging control device 300 includes:

[0104] An adjustment module 301 is used to adjust a target value of an input voltage loop to obtain input currents under multiple different input voltages, and the input voltage loop is used to adjust the input voltage in a direction close to the target value;

[0105] The determination module 302 is used to determine the type of the connected external power source based on the fluctuation information of multiple input currents, and the type includes a constant current charging power source or a variable current charging power source.

[0106] It should be noted that the specific details of each module unit in the above-mentioned charging control device 300 have been described in detail in the embodiment of the above-mentioned charging control method, and will not be repeated here.

[0107] In the embodiments of the present application, the term "module" or "unit" refers to a computer program or a part of a computer program with a predetermined function, and works together with other related parts to achieve a predetermined goal, and can be implemented in whole or in part by using software, hardware (such as processing circuits or memories) or a combination thereof. Similarly, a processor (or multiple processors or memories) can be used to implement one or more modules or units. In addition, each module or unit can be part of an overall module or unit that includes the function of the module or unit.

[0108] In some embodiments, the charging control device in the embodiments of the present application can be implemented in hardware, such as an energy storage device, or a component in an energy storage device, such as an integrated circuit or a chip; the charging control device can also be implemented in software, such as as an application installed in a terminal or an energy storage device.

[0109] In some embodiments, the energy storage device includes a processor and a memory. The memory stores a computer program that can be run on the processor. When the program is executed by the processor, each process of the embodiment of the charging control method running on the energy storage device is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0110] An embodiment of the present application also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the various processes of the embodiment of the above-mentioned charging control method are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0111] The processor may be the processor in the energy storage device in the above embodiment. The computer readable storage medium may be a computer read-only memory ROM, a random access memory RAM, a magnetic disk or an optical disk.

[0112] Computer readable media may include computer storage media and communication media. Computer storage media include volatile and non-volatile, removable and non-removable media implemented by any method or technology for storing information such as computer readable instructions, data structures, program modules or other data. Computer storage media include RAM, ROM, Erasable Programmable Read-Only Memory (EPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), flash memory or other solid-state storage technologies, CD-ROM, Digital Versatile Disc (DVD) or other optical storage, cassettes, magnetic tapes, disk storage or other magnetic storage devices. Of course, those skilled in the art will know that computer storage media are not limited to the above.

[0113] The embodiment of the present application also provides a computer program product, including a computer program, which implements the above-mentioned charging control method when executed by a processor. The processor may be a processor in the energy storage device in the above-mentioned embodiment. When the computer program is executed by the processor, each process of the embodiment of the above-mentioned charging control method is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0114] It is understandable that in the specific implementation of this application, data related to user identity or characteristics is involved. When the above embodiments of this application are applied to specific products or technologies, user permission or consent is required, and the collection, use and processing of relevant data need to comply with relevant laws, regulations and standards of relevant countries and regions.

[0115] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A charging control method for an energy storage device, characterized in that: include: Adjusting a target value of an input voltage loop to obtain input currents under a plurality of different input voltages, wherein the input voltage loop is used to adjust the input voltage in a direction close to the target value; Based on the fluctuation information of the plurality of input currents, the type of the connected external power source is determined, the type comprising a constant current charging power source or a variable current charging power source.

2. The charging control method according to claim 1, characterized in that: The constant current charging power supply includes a vehicle fast charger, and the variable current charging power supply includes a photovoltaic panel.

3. The charging control method according to claim 1, characterized in that: The step of adjusting the target value of the input voltage loop comprises: The target value is adjusted toward a direction approaching a preset minimum tracking voltage.

4. The charging control method according to claim 1 or 3, characterized in that: The step of adjusting the target value of the input voltage loop comprises: Based on a preset charging strategy, the target value of the input voltage loop is adjusted so that the charging power of the energy storage device reaches the maximum power.

5. The charging control method according to any one of claims 1 to 4, characterized in that: The determining the type of the connected external power source based on the fluctuation information of the plurality of input currents comprises: Acquire a first input current corresponding to the input voltage matching a determination voltage, and acquire a second input current corresponding to the input voltage matching a minimum tracking voltage, wherein the determination voltage is determined based on a preset minimum tracking voltage and an open circuit voltage when connected to the external power supply; Based on the first input current and the second input current, a type of the external power source is determined.

6. The charging control method according to claim 5, characterized in that: The determining the type of the external power source based on the first input current and the second input current includes: calculating a fluctuation value based on the first input current and the second input current; When the fluctuation value is greater than a preset fluctuation threshold, determining that the type of the external power source is a variable current charging power source; When the fluctuation value is less than a preset fluctuation threshold, it is determined that the type of the external power source is a constant current charging power source.

7. The charging control method according to claim 6, characterized in that: The fluctuation value is determined based on at least one of the following formulas: F = abs((I1-I2) / I1); F = abs((I1-I2) / (V1-Vmin)); Wherein, I1 is the first input current, I2 is the second input current, V1 is the determination voltage, and Vmin is the minimum tracking voltage.

8. The charging control method according to any one of claims 1 to 4, characterized in that: The determining the type of the connected external power source based on the fluctuation information of the plurality of input currents comprises: calculating a variance of a plurality of said input currents; A type of the external power source is determined based on the variance.

9. The charging control method according to any one of claims 1 to 8, characterized in that: Also includes: When it is determined that the type of the external power source is a variable current charging power source, adjusting the target value of the input voltage loop based on a preset charging strategy so that the charging power of the energy storage device reaches a maximum power; When it is determined that the type of the external power source is a constant current charging power source, the target value of the input voltage loop is adjusted based on the open circuit voltage when the external power source is connected, so that the actual input voltage is less than the open circuit voltage.

10. The charging control method according to any one of claims 1 to 4, characterized in that: The step of adjusting the target value of the input voltage loop to obtain input currents under multiple different input voltages includes: Adjusting a target value of an input voltage loop, and determining a target output value by making the output values ​​of the input voltage loop, the output voltage loop, and the output current loop compete with each other, wherein the target output value is a minimum value among a plurality of output values; The target value of the input current loop is determined based on the target output value, and the duty cycle of the pulse width modulation is adjusted by the output value of the input current loop. The input voltage loop, output voltage loop, output current loop and input current loop are all closed-loop feedback controllers.

11. The charging control method according to claim 10, characterized in that: Also includes: When the target output value reaches a set threshold corresponding to the input voltage loop, the duty cycle of the pulse width modulation is stopped from being adjusted.

12. A charging control device, characterized in that: include: An adjustment module, used for adjusting a target value of an input voltage loop to obtain input currents under a plurality of different input voltages, wherein the input voltage loop is used for adjusting the input voltage in a direction close to the target value; The determination module is used to determine the type of the connected external power supply based on the fluctuation information of the multiple input currents, and the type includes a constant current charging power supply or a variable current charging power supply.

13. An energy storage device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the charging control method for the energy storage device according to any one of claims 1 to 11 is implemented.

14. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the charging control method for the energy storage device as described in any one of claims 1 to 11 is implemented.

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