Pre-charging control method, energy storage device, electronic equipment and storage medium

Abstract

The invention discloses a pre-charging control method, an energy storage device, electronic equipment and a storage medium. The pre-charging control method is applied to the energy storage device, the energy storage device comprises a plurality of pre-charging branches, and the pre-charging control method comprises the steps of obtaining a battery module voltage of a battery module and a device voltage of an external device; determining an equipment pre-charging branch according to the battery module voltage, the equipment voltage and the allowable voltage of each pre-charging branch; switching on an equipment pre-charging branch and timing, and acquiring a pre-charging voltage difference between the voltage of the battery module and the voltage of the equipment when the equipment pre-charging branch is switched on; and according to the timing duration and the pre-charging voltage difference, determining whether pre-charging is completed, and when pre-charging is completed, controlling the pre-charging branch circuit of the device to be switched off and controlling the charging and discharging branch circuit to be switched on. According to the embodiment of the invention, the pre-charging branch of the equipment is determined according to the voltage difference between the voltage of the battery module and the voltage of the equipment, the use requirements of users in different scenes are met, the pre-charging branch is prevented from being damaged, and the user experience is improved.

Description

Technical Field

[0001] The present invention relates to the field of electronic technologies, and in particular, to a pre-charging control method, an energy storage device, an electronic device, and a storage medium. Background Art

[0002] When an energy storage device is connected to a load with a large input capacitance, since the internal resistance of a lithium battery is usually small, when the capacitor is just connected to the energy storage device without electricity, the initial current at that moment is the output voltage of the energy storage device divided by the sum of the resistances of the entire circuit. Therefore, a very large current usually appears at this time, and it is easy to trigger over-current or short-circuit protection of the energy storage device.

[0003] In the prior art, a pre-charge circuit is usually added to the battery management system (BMS) of the lithium battery. When the energy storage device supplies power to the load, the pre-charge circuit is first turned on to achieve current-limiting power supply to the load, and then the power supply switch of the energy storage device is closed for normal discharge when the voltage of the load is close to the voltage of the energy storage device.

[0004] However, the structure and control logic of the pre-charge circuit in the prior art are simple, and the applicable usage scenarios are single, which also results in a relatively high risk of damage to the pre-charge circuit and poor user experience. Summary of the Invention

[0005] The present invention provides a pre-charging control method, an energy storage device, an electronic device, and a storage medium to avoid damage to the pre-charge branch and improve user experience.

[0006] According to one aspect of the present invention, a pre-charging control method is provided, which is applied to an energy storage device. The energy storage device includes a battery module, a charge and discharge branch, and at least two pre-charge branches connected in parallel, and the impedances of the pre-charge branches are different; the pre-charging control method includes:

[0007] Obtain the battery module voltage of the battery module and the device voltage of an external device;

[0008] Determine a device pre-charge branch according to the battery module voltage, the device voltage, and the allowable voltage of each pre-charge branch;

[0009] Control the device pre-charge branch to conduct and start timing, and obtain the pre-charge voltage difference between the battery module voltage and the device voltage when the device pre-charge branch conducts;

[0010] Determine whether pre-charging is completed according to the timing duration and the pre-charge voltage difference, and when pre-charging is completed, control the device pre-charge branch to turn off and control the charge and discharge branch to conduct, so that the battery module supplies power to the external device through the charge and discharge branch.

[0011] Optionally, the specific method for determining the device pre-charge branch according to the battery module voltage, the device voltage, and the allowable voltage of each pre-charge branch includes:

[0012] Calculate the voltage difference according to the battery module voltage and the device voltage;

[0013] Determine the device pre-charge branch according to the voltage difference and the allowable voltage of each pre-charge branch.

[0014] Optionally, the specific method for determining the device pre-charge branch according to the voltage difference and the allowable voltage of each pre-charge branch includes:

[0015] Take the pre-charge branch with the largest allowable voltage among each pre-charge branch as the maximum pre-charge branch;

[0016] If the voltage difference is greater than or equal to the allowable voltage of the maximum pre-charge branch, re-obtain the battery module voltage and the device voltage;

[0017] If the voltage difference is less than the allowable voltage of the maximum pre-charge branch, take each pre-charge branch with an allowable voltage greater than the voltage difference as a pending branch;

[0018] Take the pending branch with the smallest impedance among each pending branch as the device pre-charge branch.

[0019] Optionally, the specific method for determining whether the pre-charge is completed according to the timing duration and the pre-charge pressure difference includes:

[0020] If the timing duration is less than the preset time, determine whether the pre-charge pressure difference is less than the preset threshold;

[0021] If the pre-charge pressure difference is less than the preset threshold, the pre-charge is completed;

[0022] If the pre-charge pressure difference is greater than or equal to the preset threshold, re-determine whether the timing duration is less than the preset time;

[0023] If the timing duration is greater than or equal to the preset time, control the device pre-charge branch to turn off and record the number of timeouts, and determine whether to re-determine the device pre-charge branch according to the number of timeouts.

[0024] Optionally, the specific method for determining whether to re-determine the device pre-charge branch according to the number of timeouts includes:

[0025] Obtain the number of timeouts;

[0026] If the number of timeouts is less than or equal to the preset number of times, re-determine the device pre-charge branch;

[0027] If the number of timeout times is greater than the preset number, prompt the user that the pre-charging fails.

[0028] Optionally, after controlling the pre-charging branch of the device to conduct and timing, and obtaining the pre-charging pressure difference between the voltage of the battery module and the voltage of the device when the pre-charging branch of the device conducts, it further includes:

[0029] If the pre-charging pressure difference is greater than or equal to the allowable voltage of the pre-charging branch of the device, control the pre-charging branch of the device to turn off;

[0030] If the pre-charging pressure difference is less than the allowable voltage of the pre-charging branch of the device, determine whether the pre-charging is completed according to the timing duration and the pre-charging pressure difference, and when the pre-charging is completed, control the pre-charging branch of the device to turn off and control the charge and discharge branch to close.

[0031] According to another aspect of the present invention, an energy storage device is further provided, and the energy storage device includes: at least one battery module, a battery management system, a charge and discharge branch, and at least two pre-charging branches connected in parallel;

[0032] The battery module is connected to the charge and discharge branch; the pre-charging branch is connected in parallel with the charge and discharge branch; the battery module, the charge and discharge branch, and the pre-charging branch are all connected to the battery management system;

[0033] The battery module is used for energy storage; the charge and discharge branch is used for controlling the connection between the battery module and an external device; the pre-charging branch is used for pre-charging the battery module or the external device; the battery management system is used for executing the pre-charging control method described in any one of the above embodiments.

[0034] Optionally, the pre-charging branch includes: a pre-charging switch and a pre-charging resistor connected in series.

[0035] According to still another aspect of the present invention, an electronic device is further provided, and the electronic device includes:

[0036] At least one processor; and

[0037] A memory communicatively connected to the at least one processor; wherein,

[0038] 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 the pre-charging control method described in any one of the above embodiments.

[0039] According to another aspect of the present invention, there is also provided a computer-readable storage medium storing computer instructions for causing a processor to implement the pre-charge control method described in any one of the above embodiments when executed.

[0040] In the embodiments of the present invention, the device pre-charge branch is determined based on the battery module voltage, the device voltage, and the allowable voltage of each pre-charge branch, and timing is performed when the device pre-charge branch is turned on; it is determined whether the pre-charge is completed based on the pre-charge voltage difference between the battery module voltage and the device voltage and the timing duration when the device pre-charge branch is turned on, and when completed, the device pre-charge branch is controlled to turn off and the charge and discharge branch is controlled to close. In the embodiments of the present invention, the device pre-charge branch for pre-charging the external device is selected according to the voltage difference between the battery module voltage and the device voltage, meeting the usage requirements of users in different scenarios, being beneficial to avoiding damage to the pre-charge branch, and improving the user experience.

[0041] It should be understood that the content described in this part is not intended to identify 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. Description of the Drawings

[0042] 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 following-described drawings are only some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0043] Figure 1 is a schematic diagram of an energy storage device provided by an embodiment of the present invention;

[0044] Figure 2 is a flowchart of a pre-charge control method provided by an embodiment of the present invention;

[0045] Figure 3 is a flowchart of another pre-charge control method provided by an embodiment of the present invention;

[0046] Figure 4 is a flowchart of yet another pre-charge control method provided by an embodiment of the present invention;

[0047] Figure 5 is a schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. Detailed Embodiments

[0048] 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 with reference to 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 efforts shall fall within the protection scope of the present invention.

[0049] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above accompanying drawings are used to distinguish similar objects, and are not necessarily used 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 herein can be implemented in an order different from those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0050] The embodiment of the present invention provides a pre-charge control method, which is applied to an energy storage device. To facilitate the understanding of the pre-charge control method provided by the embodiment of the present invention, the electrical structure of the energy storage device to which the pre-charge control method is applied will be described first. The energy storage device includes a battery module, a battery management system, a charge and discharge branch, and at least two pre-charge branches. The impedances of the pre-charge branches are different, and the pre-charge branches are connected in parallel; the battery management system (Battery Management Systerm, BMS) can be used to execute the pre-charge control method provided by any embodiment of the present invention.

[0051] Figure 1 is a schematic diagram of an energy storage device provided by an embodiment of the present invention. Refer to Figure 1 , the energy storage device includes: at least one battery module 110, a battery management system 120, a positive charge and discharge branch 130, a charge and discharge branch 140, and at least two pre-charge branches 150 connected in parallel.

[0052] The positive electrode of the battery module 110 is connected to the positive charge and discharge branch 130. It should be noted that the positive charge and discharge branch 130 is not necessary and can be selectively configured or not configured on the positive electrode side of the battery module 110 according to actual control needs. The negative electrode of the battery module 110 is connected to the charge and discharge branch 140; the pre-charge branch 150 is connected in parallel with the charge and discharge branch 140; the battery module 110, the positive charge and discharge branch 130, the charge and discharge branch 140, and the pre-charge branch 150 are all connected to the battery management system 120; the battery module 110 is used for energy storage; the positive charge and discharge branch 130 is used to control the connection between the positive electrode of the battery module 110 and an external device; the charge and discharge branch 140 is used to control the connection between the negative electrode of the battery module 110 and an external device; the pre-charge branch 150 is used to pre-charge the battery module 110 or an external device; the battery management system 120 is used to execute the pre-charge control method provided in any of the above embodiments. When there are multiple battery modules 110 in the energy storage system, the battery modules 110 can be connected together in parallel or in series, and this embodiment does not limit this.

[0053] Among them, the number of pre-charge branches 150 is at least two. Of course, more pre-charge branches 150 can also be set according to the actual application scenario needs of the energy storage device. That is to say, the number of pre-charge branches 150 is not limited to Figure 1 the number shown in. Each pre-charge branch 150 includes: a pre-charge switch K and a pre-charge resistor R connected in series. The first end of the pre-charge switch K is connected to the battery module 110, the second end of the pre-charge switch K is connected to the first end of the pre-charge resistor R, and the second end of the pre-charge resistor R is connected to an external device. The external device is connected between the external discharge port 200 of the energy storage device. The positive charge and discharge branch 130 may include a positive switch S. The charge and discharge branch 140 may include a first switching tube M1 and a second switching tube M2, and the first switching tube M1 and the second switching tube M2 are connected in series between the negative electrode of the battery module 110 and an external device. A fuse F may also be provided in the charge and discharge branch 140, and the fuse F is provided between the second switching tube M2 and an external device to prevent overcurrent of the battery module 110. The pre-charge switch K, the positive switch S, the first switching tube M1, and the second switching tube M2 may be composed of solid-state switches such as transistors and relays, and are all controlled by the battery management system 120. The battery management system 120 collects the battery module voltage of the battery module 110 and the device voltage of an external device. It should be noted that if the positive charge and discharge branch 130 is configured, the positive charge and discharge branch 130 is always in a closed state during the charge and discharge process of the battery module, and the positive charge and discharge branch 130 is also in a closed state during the pre-charge process of the battery module 110 to an external device and the pre-charge process of an external device to the battery module 110.

[0054] The pre-charge control method provided by the embodiment of the present invention is applicable to the pre-charge of an external device by an energy storage device or the pre-charge of an energy storage device by an external device. This pre-charge control method can be executed by the battery management system 120 of the energy storage device, and the battery management system 120 can be implemented by software and / or hardware. The following embodiments will specifically describe the pre-charge control method executed by the battery management system 120.

[0055] Figure 2 is a flowchart of a pre-charge control method provided by an embodiment of the present invention. On the basis of the above embodiments, with reference to Figure 2 , the pre-charge control method includes:

[0056] S110. Obtain the battery module voltage of the battery module and the device voltage of the external device.

[0057] Specifically, the battery module voltage of the battery module and the device voltage of the external device can be obtained by collecting through a hardware sampling circuit. Further, the device voltage can be obtained by collecting the voltage value at the external port of the energy storage device.

[0058] S120. Determine the device pre-charge branch according to the battery module voltage, the device voltage, and the allowable voltage of each pre-charge branch.

[0059] Specifically, the pre-charge branch is composed of a switch and a resistive element, and the impedance of the pre-charge branch is provided by the resistive element. Exemplarily, the resistive element can be a resistor. Therefore, the allowable voltage of the pre-charge branch can be obtained from the maximum allowable power of the resistive element in the pre-charge branch and the impedance of the resistive element. The allowable voltage of the pre-charge branch can be calculated by the following formula:

[0060] P = U 2 / R;

[0061] where P is the maximum allowable power of the resistive element; U is the allowable voltage of the pre-charge branch; and R is the impedance of the resistive element.

[0062] The voltage difference between the battery module voltage and the device voltage is the voltage applied to the pre-charge branch. According to Ohm's law, when the impedance of the pre-charge branch is constant, the greater the voltage applied to the pre-charge branch, the greater the current flowing through the pre-charge branch. When the impedance of the pre-charge branch is constant, the greater the current in the pre-charge branch, the greater the heat generated by the pre-charge branch, and the greater the risk of the pre-charge branch being burned out. It can be seen that the heat generated by the pre-charge branch is related to the voltage applied to the pre-charge branch. Therefore, by comparing the voltage difference between the battery module voltage and the device voltage with the allowable voltage of the pre-charge branch, it can be determined whether the pre-charge branch can carry out pre-charging for the external device. When the pre-charge branch can carry out pre-charging for the external device, the pre-charge branch can be used as the device pre-charge branch to pre-charge the external device. It should be noted that when there are multiple components in the external device that need to be pre-charged, the device pre-charge channel can be selected according to the connection method of each component in the external device. When the components in the external device are connected in parallel, since the device voltages of the components are the same in parallel connection, only one device pre-charge branch needs to be determined according to the device voltage and the battery of the battery module in this case. When the components in the external device are connected in series, since the voltages of the components are different in series connection, in this case, multiple device pre-charge branches need to be determined according to the battery module voltage and the device voltages of the components, and each device pre-charge branch corresponds to one component.

[0063] S130. Control the device pre-charge branch to conduct and time, and obtain the pre-charge voltage difference between the battery module voltage and the device voltage when the device pre-charge branch conducts.

[0064] Specifically, when selecting the device pre-charge branch, the battery management system generates a closing instruction and starts timing. In addition, the battery management system also re-obtains the battery module voltage of the battery module and the device voltage of the external device, and calculates the pre-charge voltage difference according to the re-obtained battery module voltage of the battery module and the device voltage of the external device. The absolute value of the difference between the re-obtained battery module voltage of the battery module and the re-obtained device voltage of the external device is the pre-charge voltage difference. It should be noted that the battery management system can re-obtain the battery module voltage of the battery module and the device voltage of the external device at the same time when generating the closing instruction, or can re-obtain the battery module voltage of the battery module and the device voltage of the external device after generating the closing instruction. This embodiment does not limit this. The device pre-charge branch obtains the closing instruction and performs a closing action according to the closing instruction. At this time, the device pre-charge branch conducts.

[0065] S140. Determine whether the pre-charging is completed according to the timing duration and the pre-charge voltage difference, and when the pre-charging is completed, control the device pre-charge branch to turn off, and control the charge and discharge branch to conduct, so that the battery module supplies power to the external device through the charge and discharge branch.

[0066] Specifically, taking the case where the battery module voltage of the battery module is greater than the device voltage of the external device as an example, at this time, the battery module pre-charges the external device. When the device pre-charge branch is turned on, the battery module pre-charges the external device. The battery module voltage of the battery module gradually decreases, the device voltage of the external device gradually increases, and the pre-charge voltage difference gradually decreases.

[0067] The preset threshold is a voltage value preset for determining whether the battery module voltage and the device voltage are close. Due to factors such as the internal resistance of the battery module and the capacitive reactance of the external device, the battery module voltage and the device voltage of the battery module cannot be exactly the same. Therefore, when the battery module voltage and the device voltage are close, it can be considered that the battery module voltage and the device voltage are the same. That is, when the pre-charge voltage difference is less than the pre-charge threshold, it can be considered that the battery module voltage and the device voltage are the same. In addition, limited by the working environment of the pre-charge branch, the heat generated by the pre-charge branch cannot be dissipated in time. Therefore, when the pre-charge branch is working, it is necessary to limit the working time of the pre-charge branch to further prevent the pre-charge branch from being damaged.

[0068] Starting from the moment when the pre-charge branch is turned on, the battery management system continuously obtains the pre-charge voltage difference and judges whether the pre-charge voltage difference is less than the preset threshold. The pre-charge voltage difference changes with the conduction duration of the pre-charge branch. The longer the conduction duration of the pre-charge branch, the smaller the pre-charge voltage difference. The acquisition of the pre-charge voltage difference by the battery management system is also carried out over time. Therefore, when the timing duration is less than the preset time and the pre-charge voltage difference is less than the preset threshold, it indicates that the pre-charging is completed. At this time, the battery management system generates a turn-off instruction and a negative pole closing instruction. The device pre-charge branch acts to turn off according to the turn-off instruction, and the negative pole charge and discharge instruction is closed according to the negative pole charge and discharge instruction. At this time, the battery module supplies power to the external device. When the timing duration is greater than the preset time, it indicates that the conduction of the pre-charge branch times out. At this time, the device pre-charge branch is controlled to turn off and the timeout count is recorded, and it is judged whether to re-determine the device pre-charge branch according to the timeout count. When the timeout count is less than or equal to the preset count, the device pre-charge branch is re-determined, and the external device is pre-charged again according to the re-determined device pre-charge branch; when the timeout count is greater than the preset count, the user is prompted that the pre-charging fails. Among them, when the conduction of the pre-charge branch times out, a certain time delay can also be performed. After the delay ends, it is judged whether to re-determine the device pre-charge branch according to the timeout count to reduce the temperature of the pre-charge branch and further avoid damage to the pre-charge branch. It should be noted that the preset time is the maximum conduction time of the device pre-charge branch preset in advance; the preset count is the maximum number of times for re-determining the device pre-charge branch preset in advance.

[0069] In an embodiment of the present invention, the device pre-charge branch is determined based on the battery module voltage, the device voltage, and the allowable voltage of each pre-charge branch, and timing is performed when the device pre-charge branch is turned on; it is determined whether the pre-charging is completed based on the pre-charge voltage difference between the battery module voltage and the device voltage and the timing duration when the device pre-charge branch is turned on, and when completed, the device pre-charge branch is controlled to turn off, and the charge and discharge branch is controlled to close. In an embodiment of the present invention, the device pre-charge branch for pre-charging the external device is selected according to the voltage difference between the battery module voltage and the device voltage, meeting the usage requirements of users in different scenarios, facilitating avoiding damage to the pre-charge branch, and enhancing the user experience.

[0070] Figure 3 It is a flowchart of another pre-charge control method provided by an embodiment of the present invention. On the basis of the above embodiments, optionally, referring to Figure 3 , the specific method for determining the device pre-charge branch according to the battery module voltage, the device voltage, and the allowable voltage of each pre-charge branch includes:

[0071] S121. Calculate the voltage difference according to the battery module voltage and the device voltage.

[0072] Specifically, calculate the difference between the battery module voltage and the device voltage, and calculate the absolute value of the difference between the battery module voltage and the device voltage. The absolute value of the voltage difference between the battery module voltage and the device voltage is the voltage difference.

[0073] S122. Determine the device pre-charge branch according to the voltage difference and the allowable voltage of each pre-charge branch.

[0074] Specifically, sort each pre-charge branch according to the allowable voltage of each pre-charge branch, and use the pre-charge branch with the largest allowable voltage in the sorting as the maximum pre-charge branch. When the voltage difference is greater than or equal to the allowable voltage of the maximum pre-charge branch, it indicates that the allowable voltages of all pre-charge branches are less than the voltage difference, and all pre-charge branches cannot carry the current required for pre-charging the external device. At this time, continuously obtain the battery module voltage and the device voltage, and continuously determine the device pre-charge branch according to the obtained battery module voltage and the device voltage, so as to immediately determine the device pre-charge branch when the voltage difference is less than the allowable voltage of the maximum pre-charge branch.

[0075] When the voltage difference is less than the allowable voltage of the maximum pre-charge branch, it indicates that at least one of the pre-charge branches has an allowable voltage greater than the voltage difference among all the pre-charge branches at this time. That is to say, at least one pre-charge branch can carry the current required for pre-charging the external device. At this time, the voltage difference is compared with the allowable voltages of each pre-charge branch in turn, and the pre-charge branches with allowable voltages greater than the voltage difference are used as the pending branches. After determining the pending branches, the impedance of each pending branch is obtained in turn, and the pending branches are sorted according to their impedances to obtain a branch sorting, and the first pending branch in the branch sorting is used as the device pre-charge branch. Among them, the impedances of the pending branches in the branch sorting are arranged from small to large.

[0076] Figure 4 is a flowchart of another pre-charge control method provided by an embodiment of the present invention. On the basis of the above embodiments, optionally, referring to Figure 4 , after controlling the device pre-charge branch to conduct and timing, and obtaining the pre-charge voltage difference between the battery module voltage and the device voltage when the device pre-charge branch conducts, it further includes:

[0077] S150. Determine whether the pre-charge voltage difference is less than the allowable voltage of the device pre-charge branch; if so, execute S140; if not, execute S160.

[0078] Specifically, after the pre-charge branch conducts, the external device may have a voltage mutation. When the device voltage of the external device changes, the pre-charge voltage difference also changes accordingly. Therefore, at this time, it is judged whether the selected device pre-charge branch meets the pre-charge requirements of the external device according to the re-obtained device voltage of the external device and the battery module voltage of the battery module. That is, it is judged whether the pre-charge voltage difference at this time is less than the allowable voltage of the device pre-charge branch; when the pre-charge voltage difference is less than the allowable voltage of the device pre-charge branch, it is determined whether the pre-charge is completed according to the timing duration and the pre-charge voltage difference, and when the pre-charge is completed, the device pre-charge branch is controlled to turn off and the charge-discharge branch is controlled to close; when the pre-charge voltage difference is greater than or equal to the allowable voltage of the device pre-charge branch, the device pre-charge branch is controlled to turn off to further avoid damage to the pre-charge branch.

[0079] S160. Control the device pre-charge branch to turn off.

[0080] Figure 5It is a schematic structural diagram of an electronic device provided by an embodiment of the present invention. The electronic device is intended to represent various forms of digital computers, such as, laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as, personal digital processors, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are only examples and are not intended to limit the implementation of the present invention described herein and / or claimed.

[0081] As Figure 5 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. The memory stores a computer program executable by the at least one processor. The processor 11 can perform 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.

[0082] 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 magnetic disk, an optical disk, 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 through a computer network such as the Internet and / or various telecommunication networks.

[0083] 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 appropriate processor, controller, microcontroller, etc. The processor 11 executes the various methods and processes described above, such as the pre-charge control method.

[0084] In some embodiments, the pre-charge control method may be implemented as a computer program tangibly embodied in a computer-readable storage medium, such as storage unit 18. In some embodiments, part or all of the computer program may 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 pre-charge control method described above may be performed. Alternatively, in other embodiments, the processor 11 may be configured to execute the pre-charge control method by any other suitable means (e.g., by means of firmware).

[0085] The various embodiments of the systems and techniques described above in this document may be implemented in digital electronic circuitry, integrated circuit systems, field programmable gate arrays (FPGA), application specific integrated circuits (ASIC), application specific standard products (ASSP), systems on a chip (SOC), complex programmable logic devices (CPLD), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include: being implemented in one or more computer programs executable and / or interpretable on a programmable system including at least one programmable processor, which may be a special-purpose or general-purpose programmable processor that receives data and instructions from, and transmits data and instructions to, a storage system, at least one input device, and at least one output device.

[0086] The computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus, such that the computer programs, when executed by the processor, cause the functions / operations specified in the flowcharts and / or block diagrams to be implemented. The computer programs may be executed entirely on the machine, partly on the machine, as a stand-alone software package partly on the machine and partly on a remote machine, or entirely on the remote machine or server.

[0087] In the context of the present invention, a computer-readable storage medium may 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 may 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 may 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.

[0088] The serial numbers of the embodiments of the present application above are only for description and do not represent the superiority or inferiority of the embodiments.

[0089] In the present application, for the description of the same or similar term concepts, technical solutions, and / or application scenarios, generally only a detailed description is given when it first appears. When it appears repeatedly later, for the sake of brevity, it is generally not repeated. When understanding the technical solutions and other contents of the present application, for the same or similar term concepts, technical solutions, and / or application scenarios that are not described in detail later, reference may be made to the relevant detailed descriptions before.

[0090] In the present application, the descriptions of the various embodiments have their own emphases. For the parts not described or recorded in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0091] The technical features of the technical solutions of the present application can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in the present application.

[0092] Through the description of the above embodiments, those skilled in the art can clearly understand that the above embodiment methods can be implemented by means of software plus a necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the essence of the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product is stored in a storage medium as described above (such as ROM / RAM, magnetic disk, optical disk), and includes several instructions for causing a terminal device (which may be an electrical device or a network device, etc.) to execute the methods of each embodiment of the present application.

[0093] The above are only the preferred embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be similarly included in the patent protection scope of the present application.

Claims

1. A pre-charge control method, characterized in that, Applied to an energy storage device, the energy storage device includes a battery module, a charge and discharge branch, and at least two pre-charge branches connected in parallel, and the impedances of the pre-charge branches are different; the pre-charge control method includes: Obtain the battery module voltage of the battery module and the device voltage of an external device; Determine the device pre-charge branch according to the battery module voltage, the device voltage, and the allowed voltage of each pre-charge branch; Control the device pre-charge branch to conduct and time, and obtain the pre-charge voltage difference between the battery module voltage and the device voltage when the device pre-charge branch conducts; Determine whether the pre-charge is completed according to the timing duration and the pre-charge voltage difference, and when the pre-charge is completed, control the device pre-charge branch to turn off and control the charge and discharge branch to conduct, so that the battery module supplies power to the external device through the charge and discharge branch.

2. The pre-charging control method according to claim 1, wherein The specific method for determining the device pre-charge branch according to the battery module voltage, the device voltage, and the allowed voltage of each pre-charge branch includes: Calculate the voltage difference according to the battery module voltage and the device voltage; Determine the device pre-charge branch according to the voltage difference and the allowed voltage of each pre-charge branch.

3. The pre-charge control method according to claim 2, characterized in that The specific method for determining the device pre-charge branch according to the voltage difference and the allowed voltage of each pre-charge branch includes: Take the pre-charge branch with the largest allowed voltage among the pre-charge branches as the maximum pre-charge branch; If the voltage difference is greater than or equal to the allowed voltage of the maximum pre-charge branch, re-obtain the battery module voltage and the device voltage; If the voltage difference is less than the allowed voltage of the maximum pre-charge branch, take the pre-charge branches with allowed voltages greater than the voltage difference as the pending branches; Take the pending branch with the smallest impedance among the pending branches as the device pre-charge branch.

4. The pre-charging control method according to claim 1, wherein, The specific method for determining whether the pre-charge is completed according to the timing duration and the pre-charge voltage difference includes: If the timing duration is less than the preset time, determine whether the pre-charge voltage difference is less than the preset threshold; If the pre-charge voltage difference is less than the preset threshold, the pre-charge is completed; If the pre-charge voltage difference is greater than or equal to the preset threshold, re-determine whether the timing duration is less than the preset time; If the timing duration is greater than or equal to the preset time, control the device pre-charge branch to turn off and record the number of timeouts, and determine whether to re-determine the device pre-charge branch according to the number of timeouts.

5. The pre-charge control method according to claim 4, wherein The specific method for determining whether to re-determine the device pre-charge branch according to the number of timeouts includes: Obtain the number of timeouts; If the number of timeouts is less than or equal to the preset number of times, re-determine the device pre-charge branch; If the number of timeouts is greater than the preset number of times, prompt the user that the pre-charge fails.

6. The pre-charge control method according to claim 1, wherein After controlling the device pre-charge branch to conduct and time, and obtaining the pre-charge voltage difference between the battery module voltage and the device voltage when the device pre-charge branch conducts, it further includes: If the pre-charge voltage difference is greater than or equal to the allowed voltage of the device pre-charge branch, control the device pre-charge branch to turn off; If the pre-charge pressure difference is less than the allowable voltage of the pre-charge branch of the device, determine whether the pre-charge is completed according to the timing duration and the pre-charge pressure difference, and control the pre-charge branch of the device to turn off and the charge-discharge branch to close when the pre-charge is completed.

7. An energy storage device, characterized in that, It includes: At least one battery module, a battery management system, a charge-discharge branch, and at least two pre-charge branches connected in parallel; The battery module is connected to the charge-discharge branch; the pre-charge branch is connected in parallel with the charge-discharge branch; the battery module, the charge-discharge branch, and the pre-charge branch are all connected to the battery management system; The battery module is used for energy storage; the charge-discharge branch is used to control the connection between the battery module and an external device; the pre-charge branch is used to pre-charge the battery module or the external device; the battery management system is used to execute the pre-charge control method according to any one of claims 1-6.

8. The energy storage device according to claim 7, wherein, The pre-charge branch includes: a pre-charge switch and a pre-charge resistor connected in series.

9. 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 the pre-charge control method according to any one of claims 1-6.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions for causing a processor to execute the pre-charge control method according to any one of claims 1-6 when executed.

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