A power limiting method, device and storage medium of a power battery

Abstract

The application discloses a power limiting method, device and storage medium of a power battery. The method collects real-time voltage of the power battery. In the case that the real-time voltage exceeds a voltage allowable interval, a current limiting operation is performed on the power battery, wherein the upper limit of the voltage allowable interval is less than a high-voltage protection threshold of the power battery, and the lower limit is greater than a low-voltage protection threshold of the power battery. After the real-time voltage returns to a voltage recovery interval, the current limiting operation is stopped, wherein the voltage recovery interval belongs to the voltage allowable interval and has a range smaller than that of the voltage allowable interval. The power limitation of the power battery is realized. On the one hand, the voltage allowable interval is set so that the current limiting operation is performed before the protection threshold is reached, and the battery voltage is lowered. On the other hand, the voltage recovery interval smaller than the voltage allowable interval is set so that the voltage is recovered in time after the voltage is lowered, the reliability of the power limitation is improved, the occurrence of power jitter is reduced, and the driving experience is improved.

Description

Technical Field

[0001] This invention relates to energy storage battery control, and more particularly to a power limiting method, apparatus, and storage medium for a power battery. Background Technology

[0002] Power batteries that operate at high power for extended periods are highly susceptible to exceeding their upper and lower voltage limits, triggering their overvoltage protection mechanisms. Furthermore, electric vehicles place high demands on the power battery's performance in terms of power response and power variation.

[0003] Therefore, existing technologies typically limit the power of the battery before it reaches its upper or lower voltage limits. However, existing power limiting methods have shortcomings in setting the timing of the limit, often causing power fluctuations and reducing the driving experience. Summary of the Invention

[0004] This invention provides a power limiting method, device, and storage medium for a power battery to improve the reliability of power limiting, reduce power fluctuations, and enhance the driving experience.

[0005] According to one aspect of the present invention, a power limiting method for a power battery is provided, the power limiting method for a power battery comprising:

[0006] During the charging and discharging process of the power battery, the real-time voltage of the power battery is collected;

[0007] When the real-time voltage exceeds the voltage allowable range, a current limiting operation is performed on the power battery, wherein the upper limit of the voltage allowable range is less than the high voltage protection threshold of the power battery, and the lower limit of the voltage allowable range is greater than the low voltage protection threshold of the power battery.

[0008] After the real-time voltage recovers to the voltage recovery range, the current limiting operation is stopped, wherein the voltage recovery range is within the voltage allowable range and its range is smaller than the range of the voltage allowable range.

[0009] Optionally, the upper limit of the voltage allowable range is greater than the open-circuit voltage of the power battery at 100% charge, and the lower limit of the voltage allowable range is less than the open-circuit voltage of the power battery at 0% charge.

[0010] Corresponding to the upper and lower limits of the voltage allowable range, the upper limit of the voltage recovery range is equal to the open-circuit voltage of the power battery at 90% charge, and the lower limit of the voltage recovery range is equal to the open-circuit voltage of the power battery at 10% charge.

[0011] Optionally, when the power battery is a lithium iron phosphate battery, the allowable voltage range is 2.5V to 3.6V; the voltage recovery range is 3.2V to 3.33V.

[0012] Optionally, the high-voltage protection threshold is equal to the upper limit of the dynamic operating voltage of the power battery, and the low-voltage protection threshold is equal to the lower limit of the dynamic operating voltage of the power battery.

[0013] Optionally, the step of performing a current limiting operation on the power battery when the real-time voltage exceeds the allowable voltage range includes:

[0014] When the real-time voltage is within the limiting range, the current derating limit is applied to the power battery. The limiting range includes a feedback limiting range and a discharge limiting range. The feedback limiting range is greater than the upper limit of the voltage allowable range and less than the high voltage protection threshold. The discharge limiting range is less than the lower limit of the voltage allowable range and greater than the low voltage protection threshold.

[0015] When the real-time voltage is in the prohibited range, the current of the power battery is set to zero. The prohibited range includes a feedback prohibited range and a discharge prohibited range. The feedback prohibited range is greater than or equal to the high voltage protection threshold, and the discharge prohibited range is less than or equal to the low voltage protection threshold.

[0016] Optionally, when the real-time voltage is within a limited range, the current derating limitation on the power battery includes:

[0017] The operating current of the power battery is reduced to a preset value or a preset percentage.

[0018] Optionally, when the real-time voltage is within a limited range, the current derating limitation on the power battery includes:

[0019] Based on the value by which the real-time voltage exceeds the allowable voltage range, the operating current of the power battery is derated to a limit percentage, wherein the limit percentage is negatively correlated with the value by which the voltage exceeds the allowable range.

[0020] Optionally, when the power battery is a lithium iron phosphate battery, the high voltage protection threshold is equal to 3.65V and the low voltage protection threshold is equal to 2.0V.

[0021] According to another aspect of the present invention, an electronic device is provided, the electronic device comprising:

[0022] At least one processor; and

[0023] A memory communicatively connected to the at least one processor; wherein,

[0024] The memory stores a computer program that can be executed by the at least one processor, the computer program being executed by the at least one processor to enable the at least one processor to perform the power limiting method for a power battery according to any embodiment of the present invention.

[0025] According to another aspect of the present invention, a computer-readable storage medium is provided, the computer-readable storage medium storing computer instructions for causing a processor to execute and implement the power limiting method for a power battery according to any embodiment of the present invention.

[0026] The present invention provides a power limiting method, device, and storage medium for a power battery. During the charging and discharging process of the power battery, the real-time voltage is collected. If the real-time voltage exceeds the allowable voltage range, a current limiting operation is performed on the power battery. The upper limit of the allowable voltage range is less than the high-voltage protection threshold of the power battery, and the lower limit is greater than the low-voltage protection threshold. Once the real-time voltage recovers to the voltage recovery range, the current limiting operation stops. The voltage recovery range is within the allowable voltage range but smaller than the allowable voltage range itself. This achieves power limiting of the power battery. On the one hand, setting the allowable voltage range ensures that current limiting occurs before the protection threshold is reached, allowing the battery voltage to drop. On the other hand, setting a voltage recovery range smaller than the allowable voltage range ensures that normal control is restored promptly after the voltage drops, improving the reliability of power limiting, reducing power fluctuations, and enhancing the driving experience.

[0027] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram illustrating the parameter changes of a power battery before and after power fluctuations in the prior art.

[0030] Figure 2 A schematic flowchart of a power limiting method for a power battery provided in an embodiment of the present invention;

[0031] Figure 3A schematic flowchart of another power limiting method for a power battery provided in an embodiment of the present invention;

[0032] Figure 4 A schematic diagram illustrating the setting of a voltage range according to an embodiment of the present invention;

[0033] Figure 5 A SOC-OCV curve of a lithium iron phosphate battery provided for the implementation of this invention;

[0034] Figure 6 A schematic diagram illustrating the voltage change of a lithium iron phosphate battery before and after implementing current limiting operation during charging at various temperatures, provided as an embodiment of the present invention.

[0035] Figure 7 A schematic diagram illustrating the voltage change of a lithium iron phosphate battery before and after current limiting operation during discharge at various temperatures, provided as an embodiment of the present invention.

[0036] Figure 8 A schematic diagram of an electronic device that can be used to implement embodiments of the present invention is shown. Detailed Implementation

[0037] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0038] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention 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 where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0039] Figure 1This diagram illustrates parameter changes in a power battery before and after power fluctuations in a prior art application. As described in the background section, existing technologies typically limit the power of a power battery before it reaches its upper or lower voltage limits. However, with existing power limiting methods, if the power limiting and recovery mechanisms are not properly configured, sudden acceleration or deceleration of the electric vehicle can often lead to issues such as... Figure 1 The power fluctuation phenomenon of the power battery is shown. Combined with... Figure 1 During power fluctuations, the motor speed changes repeatedly within a short period, resulting in unpredictable vehicle speed fluctuations and significantly reducing the driving experience. Therefore, setting a reasonable power limiting strategy that protects the battery while ensuring stable power distribution is crucial. One existing approach involves setting multiple current-limiting voltages for different temperature conditions. However, this method requires varying current-limiting voltages, limiting currents, and recovery voltages at different temperatures. This not only necessitates extensive parameter calibration but also risks confusing the control logic, hindering the logical organization and calculation of power limiting methods and resulting in poor reliability.

[0040] To address the aforementioned problems, embodiments of the present invention provide a power limiting method for power batteries. Figure 2 This is a flowchart illustrating a power limiting method for a power battery according to an embodiment of the present invention, referring to... Figure 2 The power limiting methods for power batteries include:

[0041] S101. During the charging and discharging process of the power battery, the real-time voltage of the power battery is collected.

[0042] Specifically, a power battery refers to an energy storage battery that provides energy for the operation of an electric vehicle. For example, a power battery may include a lithium-ion battery. The charging and discharging process includes a charging process and a discharging process. The charging process refers to the process of charging the power battery using charging facilities, during which the battery's charge and voltage increase. The discharging process refers to the process of the power battery discharging externally, or it can be the process of the power battery supplying power to the electric motor of the electric vehicle, during which the battery's charge and voltage decrease. The real-time voltage of the power battery refers to the voltage across the battery terminals during the charging and discharging process. The real-time voltage can be obtained using a voltage sampling device or a voltage sampling circuit.

[0043] S102. When the real-time voltage exceeds the allowable voltage range, perform current limiting operation on the power battery.

[0044] Specifically, the voltage allowable range refers to the normal operating range within the working voltage range of the power battery. Within this range, current limiting operation is not triggered. The working voltage range is the safe voltage range of the power battery, with its upper limit being the high-voltage protection threshold and its lower limit being the low-voltage protection threshold. The upper limit of the voltage allowable range is less than the high-voltage protection threshold of the power battery, and the lower limit is greater than the low-voltage protection threshold. Current limiting operation refers to reducing the charging and discharging current of the power battery based on the original charging and discharging current. For example, if the real-time voltage exceeds the voltage allowable range and the battery output current is a first current, the current limiting operation can limit the power battery output current to 50% of the first current. Another example is that if the real-time voltage exceeds the voltage allowable range and the battery output current is the first current, the current limiting operation can limit the power battery output current to a second current less than the first current.

[0045] S103. After the real-time voltage recovers to the voltage recovery range, stop the current limiting operation.

[0046] Specifically, the voltage recovery range is a smaller voltage range within the allowable voltage range. When the real-time voltage recovers to this range, current limiting of the power battery stops, and normal current control is restored. The voltage recovery range belongs to the allowable voltage range but is smaller than its range. For example, during current limiting operation, the real-time voltage of the power battery is still collected. Once the real-time voltage of the power battery is detected to have recovered to the voltage recovery range, current limiting stops, and normal current control is restored.

[0047] The power limiting method for a power battery provided in this embodiment collects the real-time voltage of the power battery during charging and discharging. If the real-time voltage exceeds the allowable voltage range, current limiting is applied to the power battery. The upper limit of the allowable voltage range is lower than the high-voltage protection threshold of the power battery, and the lower limit is higher than the low-voltage protection threshold. Once the real-time voltage recovers to the voltage recovery range, the current limiting operation stops. The voltage recovery range is within the allowable voltage range but smaller than the allowable voltage range itself. This achieves power limiting of the power battery. On the one hand, setting the allowable voltage range ensures that current limiting occurs before the protection threshold is reached, allowing the battery voltage to drop. On the other hand, setting a voltage recovery range smaller than the allowable voltage range ensures that normal control is restored promptly after the voltage drops, improving the reliability of power limiting, reducing power fluctuations, and enhancing the driving experience.

[0048] Figure 3 This is a schematic flowchart illustrating another power limiting method for a power battery provided in an embodiment of the present invention. Figure 4This is a schematic diagram illustrating the setting of a voltage range according to an embodiment of the present invention. Based on the aforementioned embodiments, and combined with... Figure 3 and Figure 4 The power limiting methods for power batteries include:

[0049] S201. During the charging and discharging process of the power battery, the real-time voltage of the power battery is collected.

[0050] Step S201 is the same as the aforementioned step S101, and will not be repeated here.

[0051] S202. When the real-time voltage is within the limited range, the current derating limit is applied to the power battery.

[0052] Specifically, there are two situations where the real-time voltage exceeds the allowable voltage range: one is that the real-time voltage is within the restricted range, and the other is that the real-time voltage is within the prohibited range. Here, we will first explain the restricted range. The restricted range refers to the area outside the allowable voltage range that does not exceed the high and low voltage protection thresholds. The restricted range includes the feedback restriction range and the discharge restriction range. The feedback restriction range is greater than the upper limit of the allowable voltage range but less than the high voltage protection threshold, while the discharge restriction range is less than the lower limit of the allowable voltage range but greater than the low voltage protection threshold. Current derating refers to reducing the real-time current of the power battery, which includes both charging and discharging current. Corresponding one-to-one with the feedback restriction range and the discharge restriction range, derating includes derating during the feedback process and derating during the discharge process. For example, during the charging process of the power battery, the battery's charge is fed back. Once the voltage across the power battery exceeds the upper limit of the allowable voltage range and enters the feedback restriction range, the charging current of the power battery is reduced to achieve reduced charging power control. During the process of the power battery supplying power to the motor, the power battery is in a discharging state. Once the voltage at both ends of the power battery falls below the lower limit of the voltage allowable range and enters the discharge limit range, the power supply current of the power battery is reduced to achieve the reduction control of the power supply.

[0053] On one hand, derating can be implemented by reducing the operating current of the power battery to a preset value or a preset percentage. The preset value is less than the current operating current and can be determined based on experimental data; the preset percentage is less than 100%. For example, the preset value could be equal to 1 / 3C, and the preset percentage could be equal to 50%. Using a fixed derating amount or a fixed percentage allows for accurate and reliable current derating with low computational complexity and high stability. On the other hand, derating can also be implemented by reducing the operating current of the power battery to a limited percentage based on the real-time voltage exceeding the allowable voltage range. This limited percentage is less than 100% and negatively correlated with the exceeding value. When the real-time voltage is higher than the upper limit of the allowable voltage range, the exceeding value equals the difference between the real-time voltage and the upper limit; when the real-time voltage is lower than the lower limit, the exceeding value equals the difference between the lower limit and the real-time voltage. Using a derating method where the derating percentage is negatively correlated with the voltage exceeding value allows the derating amount to better adapt to the current voltage exceeding situation, resulting in faster and better derating performance.

[0054] S203. When the real-time voltage is in the prohibited range, the current of the power battery is set to zero.

[0055] Specifically, the prohibited range is further explained here. The prohibited range refers to the range exceeding or equaling the high and low voltage protection thresholds. The prohibited range includes the feedback prohibited range and the discharge prohibited range. The feedback prohibited range is greater than or equal to the high voltage protection threshold, and the discharge prohibited range is less than or equal to the low voltage protection threshold. Current zeroing limit refers to setting the real-time current of the power battery to 0. The real-time current includes both charging current and discharging current. Corresponding one-to-one with the feedback and discharge prohibited ranges, the current zeroing limit includes zeroing during the feedback process and zeroing during the discharge process. For example, during the charging process of the power battery, the battery's charge is fed back. Once the voltage across the power battery exceeds the voltage allowable range and enters the feedback prohibited range, the charging current of the power battery is set to zero to reduce the charging power.

[0056] S204. After the real-time voltage recovers to the voltage recovery range, stop the current limiting operation.

[0057] Step S204 is the same as step S103 described above, and will not be repeated here.

[0058] The power limiting method for power batteries provided in this embodiment applies current derating to the power battery when the real-time voltage is within the limiting range, and zero-current limiting when the real-time voltage is within the prohibited range, thus implementing different limiting methods for different situations. In derating, one approach is to reduce the operating current of the power battery to a preset value or a preset percentage, achieving accurate and reliable current derating with low computational complexity and high stability. Another approach is to reduce the operating current of the power battery to a limited percentage based on the excess value of the real-time voltage relative to the allowable voltage range, making the derating amount more adaptable to the current voltage exceedance and resulting in faster and better derating effects.

[0059] Optionally, based on the aforementioned embodiments, the upper limit of the voltage allowable range is not only less than the high-voltage protection threshold but also greater than the open-circuit voltage of the power battery at 100% charge. The lower limit of the voltage allowable range is not only greater than the low-voltage protection threshold but also less than the open-circuit voltage of the power battery at 0% charge. Corresponding to the upper and lower limits of the voltage allowable range, the upper limit of the voltage recovery range is equal to the open-circuit voltage of the power battery at 90% charge, and the lower limit of the voltage recovery range is equal to the open-circuit voltage of the power battery at 10% charge.

[0060] Figure 5 A SOC-OCV curve of a lithium iron phosphate battery is provided for implementation of this invention. SOC represents the state of charge, and OCV represents the open-circuit voltage of the battery. Figure 5 For example, the open-circuit voltage range of a lithium iron phosphate battery between 0% SOC and 100% SOC is 2.669V to 3.442V, and its dynamic operating voltage is measured to be 2.0V to 3.65V. The high-voltage protection threshold can be equal to the upper limit of the dynamic operating voltage of the power battery, so the high-voltage protection threshold of the lithium iron phosphate battery is also equal to 3.65V. The low-voltage protection threshold can be equal to the lower limit of the dynamic operating voltage of the power battery, so the low-voltage protection threshold of the lithium iron phosphate battery is also equal to 2.0V. Therefore, when the power battery is a lithium iron phosphate battery, the allowable voltage range can be set to 2.5V to 3.6V; the voltage recovery range can be set to 3.2V to 3.33V.

[0061] Figure 6 This is a schematic diagram illustrating the voltage changes of a lithium iron phosphate battery before and after current limiting operation during charging at various temperatures, as provided in an embodiment of the present invention. Figure 7 This is a schematic diagram illustrating the voltage changes of a lithium iron phosphate battery before and after current limiting operation during discharge at various temperatures, as provided in an embodiment of the present invention. Figure 6 and Figure 7The power battery shown uses the aforementioned voltage allowable range of 2.5V to 3.6V and voltage recovery range of 3.2V to 3.33V. The high-voltage protection threshold is equal to the upper limit of the power battery's dynamic operating voltage of 3.65V, and the low-voltage protection threshold is equal to the lower limit of the power battery's dynamic operating voltage of 2.0V. The two curves during the charging process (also known as feedback) at the same temperature correspond to different states of charge of the power battery, at 50% and 90% respectively. Similarly, the two curves during the discharging process at the same temperature correspond to different states of charge of the power battery, at 50% and 10% respectively. Figure 1 , Figure 6 and Figure 7 The power limiting method for power batteries using the embodiments of the present invention can reduce the occurrence rate of power fluctuations at various temperatures, and greatly improve the user's driving experience by quickly and effectively reducing the power of the power battery.

[0062] Figure 8 A schematic diagram of an electronic device that can be used to implement embodiments of the present invention is shown. 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, smartphones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the invention described and / or claimed herein.

[0063] like Figure 8 As shown, the electronic device 10 includes at least one processor 11 and a memory, such as a read-only memory (ROM) 12 or a random access memory (RAM) 13, communicatively connected to the at least one processor 11. The memory stores computer programs executable by the at least one processor. The processor 11 can perform various appropriate actions and processes based on the computer program stored in the ROM 12 or loaded from storage unit 18 into the RAM 13. The RAM 13 may also store various programs and data required for the operation of the electronic device 10. The processor 11, ROM 12, and RAM 13 are interconnected via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0064] Multiple components in electronic device 10 are connected to I / O interface 15, including: input unit 16, such as keyboard, mouse, etc.; output unit 17, such as various types of displays, speakers, etc.; storage unit 18, such as disk, optical disk, etc.; and communication unit 19, such as network card, modem, wireless transceiver, etc. Communication unit 19 allows electronic device 10 to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0065] Processor 11 can be a variety of general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. Processor 11 performs the various methods and processes described above, such as power limiting methods for power batteries.

[0066] In some embodiments, the power limiting method for the power battery can be implemented as a computer program tangibly contained in a computer-readable storage medium, such as storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed on the electronic device 10 via ROM 12 and / or communication unit 19. When the computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the power limiting method for the power battery described above can be performed. Alternatively, in other embodiments, processor 11 can be configured to perform the power limiting method for the power battery by any other suitable means (e.g., by means of firmware).

[0067] Various embodiments of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems-on-a-chip (SoCs), payload-programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0068] Computer programs used to implement 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 device, such that when executed by the processor, the computer programs cause the functions / operations specified in the flowcharts and / or block diagrams to be performed. The computer programs may be executed entirely on a machine, partially on a machine, or as a standalone software package, partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0069] In the context of this invention, a computer-readable storage medium can be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, apparatus, or device. A 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 thereof. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0070] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user provides input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including sound input, voice input, or tactile input).

[0071] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as data servers), or computing systems that include middleware components (e.g., application servers), or computing systems that include frontend components (e.g., user computers with graphical user interfaces or web browsers through which users can interact with implementations of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., communication networks). Examples of communication networks include local area networks (LANs), wide area networks (WANs), blockchain networks, and the Internet.

[0072] A computing system can include clients and servers. Clients and servers are generally located far apart and typically interact through a communication network. The client-server relationship is created by computer programs running on the respective computers and having a client-server relationship with each other. The server can be a cloud server, also known as a cloud computing server or cloud host, which is a hosting product within the cloud computing service system to address the shortcomings of traditional physical hosts and VPS services, such as high management difficulty and weak business scalability.

[0073] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0074] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A power limiting method for a power battery, characterized in that, include: During the charging and discharging process of the power battery, the real-time voltage of the power battery is collected; When the real-time voltage exceeds the allowable voltage range, a current limiting operation is performed on the power battery. The upper limit of the allowable voltage range is less than the high-voltage protection threshold of the power battery, and the lower limit of the allowable voltage range is greater than the low-voltage protection threshold of the power battery. Specifically, this includes: when the real-time voltage is within a limited range, current derating is performed on the power battery. The limited range includes a feedback limiting range and a discharge limiting range. The feedback limiting range is greater than the upper limit of the allowable voltage range and less than the high-voltage protection threshold, and the discharge limiting range is less than the lower limit of the allowable voltage range and greater than the low-voltage protection threshold. When the real-time voltage is within a prohibited range, current is zeroed on the power battery. The prohibited range includes a feedback prohibiting range and a discharge prohibiting range. The feedback prohibiting range is greater than or equal to the high-voltage protection threshold, and the discharge limiting range is less than or equal to the low-voltage protection threshold. After the real-time voltage recovers to the voltage recovery range, the current limiting operation is stopped, wherein the voltage recovery range is within the voltage allowable range and its range is smaller than the range of the voltage allowable range.

2. The power limiting method for a power battery according to claim 1, characterized in that, The upper limit of the voltage allowable range is greater than the open-circuit voltage of the power battery at 100% charge, and the lower limit of the voltage allowable range is less than the open-circuit voltage of the power battery at 0% charge. Corresponding to the upper and lower limits of the voltage allowable range, the upper limit of the voltage recovery range is equal to the open-circuit voltage of the power battery at 90% charge, and the lower limit of the voltage recovery range is equal to the open-circuit voltage of the power battery at 10% charge.

3. The power limiting method for a power battery according to claim 2, characterized in that, When the power battery is a lithium iron phosphate battery, the allowable voltage range is 2.5V to 3.6V; the voltage recovery range is 3.2V to 3.33V.

4. The power limiting method for a power battery according to claim 1, characterized in that, The high-voltage protection threshold is equal to the upper limit of the dynamic operating voltage of the power battery, and the low-voltage protection threshold is equal to the lower limit of the dynamic operating voltage of the power battery.

5. The power limiting method for a power battery according to claim 1, characterized in that, The current derating limitation on the power battery when the real-time voltage is within the limiting range includes: The operating current of the power battery is reduced to a preset value or a preset percentage.

6. The power limiting method for a power battery according to claim 1, characterized in that, The current derating limitation on the power battery when the real-time voltage is within the limiting range includes: Based on the value by which the real-time voltage exceeds the allowable voltage range, the operating current of the power battery is derated to a limit percentage, wherein the limit percentage is negatively correlated with the value by which the voltage exceeds the allowable range.

7. The power limiting method for a power battery according to claim 1, characterized in that, When the power battery is a lithium iron phosphate battery, the high voltage protection threshold is 3.65V and the low voltage protection threshold is 2.0V.

8. 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 that can be executed by the at least one processor, the computer program being executed by the at least one processor to enable the at least one processor to perform the power limiting method of the power battery according to any one of claims 1-7.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that, when executed by a processor, implement the power limiting method for the power battery according to any one of claims 1-7.

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