Battery charging control method, system, device and storage medium

Abstract

The application relates to a battery charging control method, system, device and storage medium, and relates to the technical field of charging control. The battery charging control method comprises the following steps: determining a battery charging state corresponding to a target battery after the charger is powered on; if the battery charging state is a target charging state, determining battery voltage information corresponding to the target battery and output voltage information of the charger; determining a target charging voltage difference according to the battery voltage information and the output voltage information; if the target charging voltage difference does not meet a preset fast charging condition, performing pre-charging processing on the target battery until the target charging voltage difference meets the preset fast charging condition; and if the target charging voltage difference meets the preset fast charging condition, switching a charging and discharging switch tube state to an open state, and charging the target battery according to a constant charging mode corresponding to the open state. The application can realize safe and fast charging, and ensure the service life and safety of a battery product.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery charging control method, system, device and storage medium. BACKGROUND

[0002] With the development of battery technology and the global emphasis on climate change, various economies have set their own double carbon targets. Lithium-ion batteries are rapidly developing for mobile energy storage and home energy storage, and are developing towards multi-series and parallel.

[0003] Currently, there are three charging modes for lithium-ion battery strings, namely small current pre-charge mode (Pre-Charge Mode), constant current mode (Constant Current Mode, CC Mode), and constant voltage mode (Constant Voltage Mode, CV Mode). Most existing chargers only include CC mode and CV mode, which only control the maximum output voltage value and the maximum output current value, so such chargers are also called "dumb" chargers, which have the advantages of low price, safety and high reliability, but cannot directly charge low-capacity batteries. SUMMARY

[0004] In order to solve the above technical problems or at least partially solve the above technical problems, the present application provides a battery charging control method, system, device and storage medium.

[0005] In a first aspect, the present application provides a battery charging control method, comprising:

[0006] Determining the battery charging state corresponding to the target battery after the charger is powered on;

[0007] If the battery charging state is a target charging state, determining the battery voltage information corresponding to the target battery and the output voltage information of the charger;

[0008] According to the battery voltage information and the output voltage information, determining the target charging voltage difference;

[0009] If the target charging voltage difference does not meet the preset fast charging condition, performing pre-charge processing on the target battery until the target charging voltage difference meets the preset fast charging condition;

[0010] If the target charging voltage difference meets the preset fast charging condition, switching the charge-discharge switch tube state to an open state, and charging the target battery according to the constant charging mode corresponding to the open state.

[0011] Optionally, the determining the battery charging state corresponding to the target battery after the charger is powered on comprises:

[0012] determining the charging and discharging switch tube state corresponding to the target battery after the charger is powered on;

[0013] if the charging and discharging switch tube state is an open state, determining that the battery charging state corresponding to the target battery is a non-target charging state;

[0014] if the charging and discharging switch tube state is a closed state, determining that the battery charging state corresponding to the target battery is a target charging state, and the target charging state includes a hibernation charging state and / or an over-discharge charging state.

[0015] Optionally, the determining the battery voltage information corresponding to the target battery and the output voltage information of the charger comprises:

[0016] obtaining battery management system information corresponding to the target battery;

[0017] extracting the battery voltage information and the output voltage information of the charger from the battery management system information.

[0018] Optionally, the determining the target charging voltage difference according to the battery voltage information and the output voltage information comprises:

[0019] when the battery voltage information meets a preset fast charging voltage condition, determining the output voltage of the charger based on the output voltage information;

[0020] if the output voltage does not reach a charging voltage threshold corresponding to the battery voltage information, adjusting the output voltage of the charger until the adjusted output voltage reaches the charging voltage threshold;

[0021] if the output voltage of the charger reaches the charging voltage threshold, determining the target charging voltage difference based on the output voltage and the battery voltage information.

[0022] Optionally, the determining the target charging voltage difference according to the battery voltage information and the output voltage information further comprises:

[0023] determining the voltage value of the target battery based on the battery voltage information;

[0024] if the voltage value of the target battery reaches a fast charging voltage threshold, determining that the battery voltage information meets a preset fast charging voltage condition;

[0025] If the voltage value of the target battery does not reach the fast charging voltage threshold, it is determined that the battery voltage information does not meet the preset fast charging voltage condition, and the target battery is subjected to pre-charging treatment until the voltage value of the target battery reaches the fast charging voltage threshold.

[0026] Optionally, the charging of the target battery in the constant charging mode corresponding to the open state comprises:

[0027] Based on the open state, the constant charging mode is determined, and the constant charging mode includes a constant current charging mode and / or a constant voltage charging mode of the charger;

[0028] Based on the current value corresponding to the constant current charging mode, the charger is controlled to charge the target battery; or,

[0029] Based on the voltage value corresponding to the constant voltage charging mode, the charger is controlled to charge the target battery.

[0030] Optionally, the pre-charging treatment of the target battery comprises:

[0031] The target battery is pre-charged through a pre-charging circuit corresponding to the target battery.

[0032] In a second aspect, the present application provides a battery charging control system, comprising:

[0033] A battery charging state determination module is configured to determine a battery charging state corresponding to a target battery after the charger is powered on;

[0034] A voltage information determination module is configured to determine battery voltage information corresponding to the target battery and output voltage information of the charger when the battery charging state is a target charging state;

[0035] A voltage difference determination module is configured to determine a target charging voltage difference based on the battery voltage information and the output voltage information;

[0036] A pre-charging treatment module is configured to perform pre-charging treatment on the target battery when the target charging voltage difference does not meet a preset fast charging condition until the target charging voltage difference meets the preset fast charging condition;

[0037] A fast charging module is configured to switch a charge-discharge switch tube to an open state when the target charging voltage difference meets the preset fast charging condition, and charge the target battery in a constant charging mode corresponding to the open state.

[0038] In a third aspect, a charging control device of a battery is provided, comprising a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other through the communication bus.

[0039] The memory is configured to store a computer program.

[0040] The processor is configured to execute the program stored in the memory, so as to implement the steps of the charging control method of the battery according to any one of the first aspect.

[0041] In a fourth aspect, a computer readable storage medium is provided, and the computer readable storage medium stores a computer program. When the computer program is executed by a processor, the steps of the charging control method of the battery according to any one of the first aspect are implemented.

[0042] The embodiments of the present application determine the battery charging state corresponding to the target battery after the charger is powered on. If the battery charging state is the target charging state, the battery voltage information corresponding to the target battery and the output voltage information of the charger are determined. Then, the target charging voltage difference is determined according to the battery voltage information and the output voltage information. When the target charging voltage difference does not meet the preset fast charging condition, the target battery is subjected to pre-charging processing, until the target charging voltage difference meets the preset fast charging condition, thereby reducing the large voltage difference between the charger and the battery, avoiding the risk of generating a large current instantaneously, i.e., solving the problem caused by the large voltage difference between the charger and the battery in the prior art. When the target charging voltage difference meets the preset fast charging condition, the charge-discharge switch tube is switched to the open state, so that the target battery is charged in the constant charging mode corresponding to the open state, thereby realizing safe and fast charging, and further ensuring the service life of the battery product and the safety of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0043] The accompanying drawings, which are incorporated into and form part of the specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the application.

[0044] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0045] Figure 1 A flowchart of a battery charging control method provided by the embodiments of the present application is shown.

[0046] Figure 2 A control diagram of a charging control system provided by the embodiments of the present application is shown.

[0047] Figure 3 A step flow chart of a battery charging control method provided by an embodiment of the present application is shown in FIG. 1.

[0048] Figure 4 A structural schematic diagram of a pre-charging circuit provided by an example of the present application is shown in FIG. 2.

[0049] Figure 5 A structural schematic diagram of a battery charging control system provided by an embodiment of the present application is shown in FIG. 3. DETAILED DESCRIPTION

[0050] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0051] In the related art, a lithium ion battery pack is charged by a CC / CV charger. When the battery voltage is lower than a small current pre-charging threshold, the small current pre-charging must be implemented by a battery management system (BMS), that is, when the existing "dumb" charger is charging a lithium battery with a battery voltage lower than a fast charging voltage threshold, the small current pre-charging mode must be implemented by the BMS to pre-charge the battery by the small current through the BMS, so that the battery voltage can reach the fast charging voltage threshold, and when the battery voltage reaches the fast charging threshold, the fast charging can be performed by switching to the CC / CV mode, for example, when the battery voltage is charged to the point where the fast charging can be entered, the BMS opens the fast charging pipe to switch the charging mode to the CC charging mode. In a high string number lithium ion battery pack, the voltage difference between the charger output voltage CV value and the battery pack voltage can be very large. Taking a 16-string lithium ion battery pack as an example, the maximum voltage difference between the two can reach 19V. When the fast charging pipe is suddenly closed, due to the huge voltage difference and the very low impedance of the lithium ion battery pack, a large instantaneous current will be generated, which will cause the charger to be pulled to protection, and long-term use will bring great risks to the product life and battery safety.

[0052] Reference Figure 1 A step flow chart of a battery charging control method provided by an embodiment of the present application is shown in FIG. 1. Specifically, the battery charging control method provided by the present application can specifically include the following steps:

[0053] Step 110, determining the battery charging state corresponding to the target battery after the charger is powered on;

[0054] Specifically, the embodiment of the present application can determine whether a charger is inserted by monitoring the output voltage of the charger, and charge the battery, such as detecting the voltage value of the battery charging port by the BMS to determine the output voltage of the external charger, so as to determine whether the charger is inserted based on the output voltage of the charger. It should be noted that the BMS can be used to monitor information such as the voltage of the battery, the power of the battery, the charging and discharging current, the temperature and whether the battery is balanced in real time, and can take appropriate protection measures according to the state of the battery to ensure the safety of the lithium ion battery. As an example of the present application, the BMS can determine whether the external charger is inserted according to the voltage value of the battery charging port by detecting whether the voltage value of the battery charging port is pulled up, and can determine that the charger is inserted when the voltage value of the battery charging port is pulled up, and can determine that the charger is not inserted when the voltage value of the battery charging port is not pulled up.

[0055] After the charger is powered on, i.e. after determining that the external charger is inserted, the embodiment of the present application can determine the battery charging state corresponding to the target battery according to the state of the charging and discharging switch tube corresponding to the target battery, so as to determine the charging mode according to the battery charging state corresponding to the target battery subsequently. Optionally, the state of the charging and discharging switch tube in the embodiment of the present application can be divided into an open state and a closed state. When it is detected that the charging and discharging switch tube is in the closed state, it can be determined that the target battery is in a target charging state, so that the battery voltage information corresponding to the target battery and the output voltage information of the charger can be determined subsequently, i.e. step 120 is executed; when the charging and discharging switch tube is in the open state, it can be determined that the target battery is in a non-target charging state, and the target battery can be subsequently fast charged according to the preset constant charging mode based on the non-target charging state, such as CC charging the target battery by the charger according to the CC mode; or, for example, CV charging the target battery by the charger according to the CV mode, etc. The embodiment of the present application does not limit this. It should be noted that the CC mode refers to the charging mode in the phase when the charging battery voltage is higher than the pre-charging voltage and lower than the full-charging voltage; the CV mode refers to the charging mode when the charging battery voltage reaches the full-charging voltage, in which mode the charging can be carried out according to constant voltage until the charging battery is fully charged.

[0056] Step 120, if the battery charging state is a target charging state, determining the battery voltage information corresponding to the target battery and the output voltage information of the charger;

[0057] Specifically, after determining the battery charging state, the embodiment of the present application can determine whether the battery can be directly fast charged by judging whether the battery charging state is a target charging state. When the battery charging state is a non-target charging state, it can be determined that the target battery can be directly fast charged at present, such as being directly charged by the charger in CC or CV, which is not limited by the embodiment of the present application. When the battery charging state is a target charging state, the battery voltage information corresponding to the target battery and the output voltage information of the charger can be obtained through the BMS, so that the target charging voltage difference can be determined according to the currently obtained battery voltage information and output voltage information in the subsequent step 130. The target charging state can be used to determine whether the target battery needs to be pre-charged, which can include the hibernation charging state of the battery, the over-discharge charging state, and the like, which is not limited by the embodiment of the present application. It should be noted that the hibernation charging state of the battery can mean that the battery enters the closed (Shut Down) charging state waiting to be activated; the over-discharge charging state can mean the charging state of the battery with over-discharged power.

[0058] Step 130, determining a target charging voltage difference according to the battery voltage information and the output voltage information;

[0059] Specifically, after determining the battery voltage information and the output voltage information of the charger, the embodiment of the present application can determine the voltage difference between the target battery and the external charger according to the battery voltage information and the output voltage information of the charger, as the target charging voltage difference. Subsequently, whether the target battery needs to be pre-charged can be determined by judging whether the target charging voltage difference meets the preset fast charging condition; when the target charging voltage difference does not meet the preset fast charging condition, the voltage of the target battery can be improved through pre-charging, that is, step 140 is executed, so as to reduce the voltage difference between the target battery and the external charger; and when the target charging voltage difference meets the preset fast charging condition, step 150 can be directly executed.

[0060] Step 140, if the target charging voltage difference does not meet the preset fast charging condition, pre-charging the target battery until the target charging voltage difference meets the preset fast charging condition.

[0061] Specifically, after determining that the target charging voltage difference does not meet the preset fast charging condition, the embodiment of the present application can perform pre-charging processing on the target battery through the pre-charging circuit, for example, by opening the small-current pre-charging circuit through the BMS to charge the target battery with a small current, so that the charger maintains the output CV voltage to pre-charge the target battery with a small current, thereby improving the voltage of the target battery, so as to reduce the target charging voltage difference. When the target voltage difference is reduced to the preset voltage difference threshold, it can be determined that the target charging voltage difference meets the preset fast charging condition, and then the state of the charge-discharge switch tube can be switched to the open state to perform fast charging on the target battery through the charging circuit corresponding to the charge-discharge switch tube using the charger, that is, step 150 is executed.

[0062] Step 150, if the target charging voltage difference meets the preset fast charging condition, the state of the charge-discharge switch tube is switched to the open state, and the target battery is charged according to the constant charging mode corresponding to the open state.

[0063] Wherein, the state of the charge-discharge switch tube can refer to the state of the charge-discharge switch tube in the charging circuit of the target battery, which can be divided into an open state and a non-open state, etc., and the embodiment of the present application does not make specific limitation. Specifically, after determining that the target charging voltage difference meets the preset fast charging condition, the embodiment of the present application can determine the state of the charge-discharge switch tube through the BMS, and can determine whether the state of the charge-discharge switch tube is in the open state, so that when the state of the charge-discharge switch tube is in the open state, the target battery is charged according to the constant charging mode corresponding to the open state; and when the state of the charge-discharge switch tube is in the non-open state, for example, when the state of the charge-discharge switch tube is in the closed state, the state of the charge-discharge switch tube can be switched to the open state through the BMS, so that the target battery can be charged according to the constant charging mode corresponding to the open state of the charge-discharge switch tube, thereby realizing the safe and fast charging of the target battery.

[0064] In summary, after the charger is powered on, the battery charging state corresponding to the target battery is determined, and when the battery charging state is the target charging state, the battery voltage information corresponding to the target battery and the output voltage information of the charger are determined. Subsequently, the target charging voltage difference is determined according to the battery voltage information and the output voltage information. When the target charging voltage difference does not meet the preset fast charging condition, the target battery is subjected to pre-charging processing to increase the voltage of the target battery, until the target charging voltage difference meets the preset fast charging condition, thereby reducing the risk of a large instantaneous current generated by a large voltage difference between the charger and the battery, solving the problem caused by a large instantaneous current generated by a large voltage difference between the charger and the battery in the prior art, and switching the charge-discharge switch tube to the open state when the target charging voltage difference meets the preset fast charging condition, so as to charge the target battery in the constant charging mode corresponding to the open state, achieving safe and fast charging and ensuring the service life and safety of the battery product.

[0065] On the basis of the above-mentioned embodiments, optionally, after detecting that the charger is inserted, the battery charging state corresponding to the target battery can be determined by detecting the state of the charge-discharge switch tube. When the state of the charge-discharge switch tube is the open state, it can be determined that the target battery is in the non-target charging state. When the state of the charge-discharge switch tube is the closed state, it can be determined that the target battery is in the target charging state, which can be the hibernation charging state or the over-discharge charging state, and the present embodiment does not make a specific limitation thereon. Further, after the charger is powered on, the battery charging state corresponding to the target battery is determined, which can specifically include: after the charger is powered on, the state of the charge-discharge switch tube corresponding to the target battery is determined. If the state of the charge-discharge switch tube is the open state, it is determined that the battery charging state corresponding to the target battery is the non-target charging state. If the state of the charge-discharge switch tube is the closed state, it is determined that the battery charging state corresponding to the target battery is the target charging state, which includes the hibernation charging state and / or the over-discharge charging state.

[0066] As an example of the embodiments of the present application, when the target battery is a lithium ion battery pack, the battery charging state can be divided into three charging states corresponding to three charging scenarios according to the charging protocol. For example, the charging state corresponding to the first charging scenario can be the hibernation charging state, the charging state corresponding to the second charging scenario can be the over-discharge charging state, and the charging state corresponding to the third charging scenario can be the non-target charging state. The third charging scenario can refer to a charging scenario in which the lithium ion battery pack does not enter the Shut Down mode and the battery capacity of the lithium ion battery pack does not enter the over-discharge state. The non-target charging state can refer to the charging state in which the battery capacity of the lithium ion battery pack does not enter the over-discharge state.

[0067] When the lithium ion battery Pack is in the Shut Down mode, the charge-discharge switch tube of the BMS is in the off state, that is, the charge-discharge switch tube is in the closed state, and the communication between the BMS and the main control microprocessor (Microcontroller Unit, MCU) of the charger is closed. When the BMS detects that the charger is plugged in, the lithium ion battery Pack can be woken up, and at the same time the battery information can be told to the charger main control MCU through the communication protocol, that is, the battery information of the lithium ion battery Pack is sent to the charger through the communication line, as shown in Figure 2 The communication protocol can include I2C bus protocol, system management bus (System Management Bus, SMbus) protocol, CANBus protocol, Ethernet protocol, etc., which is not specifically limited in this example.

[0068] After the charger receives the battery information, the battery voltage information of the lithium ion battery Pack can be extracted from the received battery information through the main control MCU, so as to determine the target charging voltage difference according to the battery voltage information, so as to determine whether the target battery needs to be pre-charged by judging whether the target charging voltage difference meets the preset fast charging condition. For example, in the case where the preset voltage difference threshold is 5 volts (Volt, V), it can be determined whether the target charging voltage difference meets the preset fast charging condition by judging whether the target charging voltage difference exceeds 5V, so that when the target charging voltage difference does not exceed 5V, it can be determined that the target charging voltage difference meets the preset fast charging condition; and when the target charging voltage difference exceeds 5V, it is determined that the target charging voltage difference does not meet the preset fast charging condition, and then the BMS can open the small current pre-charging loop to charge the lithium ion battery Pack with a small current, so as to pre-charge the lithium ion battery Pack, thereby reducing the target charging voltage difference until the target charging voltage difference meets the preset fast charging condition, and then when the target charging voltage difference meets the preset fast charging condition, the BMS can open the fast charging switch tube to realize the conversion of the charging mode from the small current pre-charging mode to the constant current charging mode, as shown in Figure 2 The charging switch tube and the discharge switch tube in the charging loop can be opened by the BMS to realize the fast charging of the lithium ion battery Pack through the charging switch tube and the discharge switch tube, thereby avoiding the problem that the traditional lithium ion battery Pack generates instantaneous current when the pre-charging mode is switched to the constant current mode charging, causing the charger to pull protection, and causing reliability and battery safety risk, ensuring the safe and fast charging of the battery.

[0069] Optionally, the embodiment of the application determines the target charging voltage difference according to the battery voltage information and the output voltage information, and specifically can include: when the battery voltage information meets the preset fast charging voltage condition, determining the output voltage of the charger based on the output voltage information; if the output voltage does not reach the charging voltage threshold corresponding to the battery voltage information, adjusting the output voltage of the charger until the adjusted output voltage reaches the charging voltage threshold; and if the output voltage of the charger reaches the charging voltage threshold, determining the target charging voltage difference based on the output voltage and the battery voltage information.

[0070] Specifically, after determining the battery voltage information corresponding to the target battery, the embodiment of the application can determine the voltage value of the target battery based on the battery voltage information, and then determine whether the battery voltage information meets the preset fast charging voltage condition by judging whether the voltage value reaches the preset fast charging voltage threshold, so that when the voltage value reaches the preset fast charging voltage threshold, it is determined that the battery voltage information meets the preset fast charging voltage condition; and when the voltage value does not reach the preset fast charging voltage threshold, it is determined that the battery voltage information does not meet the preset fast charging voltage condition, and then the target battery can be pre-charged to improve the voltage value of the target battery until the voltage value of the target battery reaches the fast charging voltage threshold, and it is determined that the battery voltage information meets the preset fast charging voltage condition. Further, the embodiment of the application determines the target charging voltage difference according to the battery voltage information and the output voltage information, and can also include: determining the voltage value of the target battery based on the battery voltage information; if the voltage value of the target battery reaches the fast charging voltage threshold, it is determined that the battery voltage information meets the preset fast charging voltage condition; if the voltage value of the target battery does not reach the fast charging voltage threshold, it is determined that the battery voltage information does not meet the preset fast charging voltage condition, and the target battery is pre-charged until the voltage value of the target battery reaches the fast charging voltage threshold.

[0071] After the battery voltage information meets the preset fast charging voltage condition, the output voltage of the charger can be determined based on the output voltage information, so as to determine whether the output voltage of the charger needs to be adjusted by judging whether the output voltage of the charger reaches the charging voltage threshold corresponding to the battery voltage information. When the output voltage of the charger does not reach the charging voltage threshold corresponding to the battery voltage information, it can be determined that the output voltage of the charger does not reach the charging voltage threshold corresponding to the current voltage value of the target battery. Then, the output voltage of the charger can be adjusted by sending an adjustment instruction from the charger master control unit (MCU), that is, the output voltage of the charger is adjusted until the adjusted output voltage reaches the charging voltage threshold. At the same time, the output voltage of the charger can be detected to determine the target charging voltage difference based on the output voltage of the charger and the battery voltage information when the output voltage of the charger reaches the charging voltage threshold. Thus, the target battery can be pre-charged until the target charging voltage difference meets the preset fast charging condition, and then the target battery is charged in a constant charging mode, thereby realizing safe and fast charging and reducing the safety risk of the battery.

[0072] Referring to Figure 3 , a step flowchart of a battery charging control method provided by an optional embodiment of the application is shown. Specifically, the battery charging control method provided by the embodiment of the application can specifically include the following steps:

[0073] Step 301: determining the state of the charging and discharging switch tube corresponding to the target battery after the charger is powered on.

[0074] Specifically, after the charger is powered on, the state of the charging and discharging switch tube corresponding to the target battery can be determined to determine the battery charging state corresponding to the target battery. If the state of the charging and discharging switch tube is an open state, it can be determined that the battery charging state corresponding to the target battery is a non-target charging state, and then the target battery can be directly charged through the fast charging loop of the target battery. If the state of the charging and discharging switch tube is a closed state, it can be determined that the battery charging state corresponding to the target battery is a target charging state, and then the battery voltage information corresponding to the target battery and the output voltage information of the charger can be determined based on the target charging state, that is, step 302 is performed. The target charging state can include a hibernation charging state and / or an over-discharge charging state, and the embodiment of the application does not make specific limitations thereto.

[0075] Step 302: determining the battery voltage information corresponding to the target battery and the output voltage information of the charger when the battery charging state is a target charging state.

[0076] Step 303: determining the voltage value of the target battery based on the battery voltage information.

[0077] Specifically, after determining the voltage value of the target battery based on the battery voltage information, the application embodiment can determine whether the voltage value of the target battery reaches the fast charging voltage threshold. If the voltage value of the target battery does not reach the fast charging voltage threshold, it can be determined that the battery voltage information does not meet the preset fast charging voltage condition, and then the target battery can be pre-charged until the voltage value of the target battery reaches the fast charging voltage threshold. If the voltage value of the target battery reaches the fast charging voltage threshold, it can be determined that the battery voltage information meets the preset fast charging voltage condition, and then step 304 is executed.

[0078] Step 304, determining the output voltage of the charger based on the output voltage information;

[0079] Specifically, after determining the output voltage of the charger based on the output voltage information, the application embodiment can determine whether the output voltage of the charger reaches the charging voltage threshold corresponding to the battery voltage information. If the output voltage of the charger does not reach the charging voltage threshold corresponding to the battery voltage information, the output voltage of the charger can be adjusted to increase the output voltage of the charger until the adjusted output voltage reaches the charging voltage threshold, and then it is determined that the output voltage of the charger reaches the charging voltage threshold, and step 305 is executed. If the output voltage of the charger reaches the charging voltage threshold corresponding to the battery voltage information, it can directly jump to step 305 for execution.

[0080] Step 305, when the output voltage of the charger reaches the charging voltage threshold, determining the target charging voltage difference based on the output voltage and the battery voltage information;

[0081] Step 306, if the target charging voltage difference does not meet the preset fast charging condition, pre-charging the target battery until the target charging voltage difference meets the preset fast charging condition;

[0082] Step 307, if the target charging voltage difference meets the preset fast charging condition, switching the charge-discharge switch tube state to the open state, and charging the target battery according to the constant charging mode corresponding to the open state.

[0083] Specifically, the charge-discharge switch tube state in the application embodiment can be divided into an open state and a closed state. When it is detected that the charge-discharge switch tube is in the closed state, it can be determined that the target battery is in a hibernation charging state or an over-discharge charging state, and then the hibernation charging state or the over-discharge charging state can be used as a target charging state to determine the battery voltage information corresponding to the target battery and the output voltage information of the charger based on the target charging state.

[0084] Optionally, in this embodiment of the application, determining the battery voltage information corresponding to the target battery and the output voltage information of the charger may specifically include: obtaining the battery management system information corresponding to the target battery; and extracting the battery voltage information and the output voltage information of the charger from the battery management system information. For example, after obtaining the battery management system information from the BMS, the battery voltage information and the output voltage information of the charger can be extracted from the parsing result. This allows the current voltage value of the target battery to be determined based on the battery voltage information, and the charging voltage of the external charger to be determined based on the output voltage information of the charger. Furthermore, the target voltage difference can be determined based on the charging voltage of the external charger and the current voltage value of the target battery to determine whether pre-charging processing of the target battery is required.

[0085] Furthermore, in this embodiment, after determining the battery voltage information and the charger's output voltage information, the voltage value in the battery voltage information can be determined as the target battery voltage value. It can also be determined whether the battery voltage information meets the preset fast charging voltage condition by judging whether this voltage value reaches a preset fast charging voltage threshold. When the voltage value does not reach the preset fast charging voltage threshold, it can be determined that the battery voltage information does not meet the preset fast charging voltage condition. Subsequently, the target battery can be pre-charged through the pre-charging circuit corresponding to the target battery. For example, the BMS can be used to open the small-current pre-charging circuit corresponding to the target battery for small-current charging to pre-charge the target battery. Optionally, the pre-charging process of the target battery in this embodiment can specifically include: pre-charging the target battery through the pre-charging circuit corresponding to the target battery to increase the voltage value of the target battery until the voltage value of the target battery reaches the fast charging voltage threshold. For example, when the pre-charging circuit includes a pre-charging switch and a pre-charging current limiter, such as... Figure 4 As shown, the BMS can control the pre-charge switch to close and conduct via the MCU, allowing the charger to form a pre-charge circuit with the target battery through the pre-charge switch and the pre-charge current limiter, pre-charging the target battery until its voltage reaches the fast-charging voltage threshold. The pre-charge current limiter can include one or more current-limiting resistors, specifically used to limit the charging current of the pre-charge circuit.

[0086] When the voltage value of the target battery reaches the preset fast charging voltage threshold, it can be determined that the battery voltage information meets the preset fast charging voltage conditions. Then, the output voltage of the charger can be determined based on the output voltage information. For example, the output voltage of the charger in the output voltage information can be determined as the output voltage of the charger. The output voltage of the charger can be compared with the current battery voltage of the target battery to determine whether the output voltage reaches the charging voltage threshold corresponding to the battery voltage information.

[0087] If the output voltage of the charger does not exceed the fast charging voltage threshold corresponding to the current voltage of the target battery, it can be determined that the output voltage does not reach the charging voltage threshold corresponding to the battery voltage information. Then, the output voltage of the charger can be adjusted based on the battery voltage information, so that the adjusted output voltage can reach the charging voltage threshold corresponding to the battery voltage information. After the output voltage of the charger reaches the charging voltage threshold, the target charging voltage difference can be determined based on the output voltage of the charger and the battery voltage information to determine whether the target voltage difference meets the preset fast charging condition by judging whether the target charging voltage difference is within the preset pressure difference range. Thus, when the target charging voltage difference is within the preset pressure difference range, it can be determined that the target voltage difference meets the preset fast charging condition. When the target charging voltage difference is not within the preset pressure difference range, it can be determined that the target voltage difference does not meet the preset fast charging condition. Then, the target battery can be pre-charged through the pre-charging circuit corresponding to the target battery to increase the voltage of the target battery and reduce the target voltage difference, so that the target voltage difference can meet the preset fast charging condition. Thus, when the target charging voltage difference meets the preset fast charging condition, the target battery can be fast charged in the constant charging mode to achieve safe and fast charging.

[0088] The constant charging mode can be a constant current charging mode or a constant voltage charging mode, and the embodiments of the present application do not make specific limitations thereon. Optionally, the target battery can be charged in the constant charging mode corresponding to the on state, which can specifically include: determining the constant charging mode based on the on state, wherein the constant charging mode includes the constant current charging mode and / or the constant voltage charging mode of the charger; controlling the charger to charge the target battery based on the current value corresponding to the constant current charging mode; or, controlling the charger to charge the target battery based on the voltage value corresponding to the constant voltage charging mode.

[0089] Specifically, when the target voltage difference meets the preset fast charging condition, the output voltage of the charger can be set to a constant voltage based on the voltage value corresponding to the constant voltage charging mode to control the charger to output a constant voltage for fast charging the target battery, thereby achieving safe and fast charging of the battery. Alternatively, the output current of the charger can be set to a constant current based on the current value corresponding to the constant current charging mode to control the charger to output a constant current for fast charging the target battery, thereby achieving safe and fast charging of the battery.

[0090] As an example of the present application, in the case where the charging voltage threshold corresponding to the battery voltage information is set to a voltage value higher than the current voltage value of the target battery by more than 3 volts, after the external charger is inserted, the charger output voltage can be the CV value, and then the charger can be detected based on the CV value, and then the lithium ion battery Pack can be checked for the Shut Down mode based on the charge-discharge switch tube state, i.e., the battery charging state corresponding to the target battery is determined based on the charge-discharge switch tube state, so that in the case where the lithium ion battery Pack is checked to be in the Shut Down mode, the BMS can be activated, the pre-charge circuit can be turned on, and the charging switch tube can be turned off to pre-charge the target battery through the pre-charge circuit, and the battery voltage information corresponding to the target battery can be extracted from the BMS information by reading the BMS information, so as to determine whether the voltage of the lithium ion battery Pack is lower than the fast charging voltage threshold based on the battery voltage information, i.e., whether the voltage value of the target battery reaches the fast charging voltage threshold.

[0091] When the voltage of the lithium ion battery Pack is lower than the fast charging voltage threshold, it can be determined that the voltage value of the target battery does not reach the fast charging voltage threshold, and then the charger can be controlled to maintain the output of the CV voltage value, and the pre-charge circuit can be opened by the BMS and the charging switch tube can be closed to charge the lithium ion battery Pack with a small current through the small current pre-charge circuit opened by the BMS, and the charger maintains the output of the CV voltage to the lithium ion battery for small current pre-charge, and then when the battery voltage charging reaches the fast charging voltage threshold, i.e., when the battery voltage charging reaches the voltage threshold that can enter the fast charging, the charger main control MCU sends a command to adjust the output voltage of the charger to be 3V higher than the voltage of the lithium ion battery Pack, i.e., the output voltage of the charger is adjusted to the charging voltage threshold corresponding to the battery voltage information, so that the adjusted output voltage of the charger reaches the charging voltage threshold, and the external voltage of the charger can be detected by the BMS to determine the target charging voltage difference based on the detected external voltage of the charger and the voltage of the lithium ion battery Pack.

[0092] For example, the voltage difference between the charger external voltage and the voltage of the lithium ion battery pack can be taken as the target charging voltage difference. The BMS can be used to detect whether the voltage difference between the charger external voltage and the voltage of the lithium ion battery pack is within the range of 5V, to determine whether the target charging voltage difference meets the preset fast charging condition. When the target charging voltage difference is not within the range of 5V, it can be determined that the target charging voltage difference does not meet the preset fast charging condition. Then, the BMS can be used to maintain the CV voltage output by the charger to the lithium ion battery for small current pre-charging. The target charging voltage difference is waited to drop until it is within the range of 5V, and it is determined that the target charging voltage difference does not meet the preset fast charging condition. When the target charging voltage difference is not higher than 5V, it can be determined that the target charging voltage difference meets the preset fast charging condition. Then, the BMS can be used to open the fast charging switch tube to realize the conversion of the charging mode from the small current pre-charging mode to the constant current charging mode. At this time, since the voltage difference between the external charger voltage and the voltage of the lithium ion battery pack is small, it will not cause an instantaneous large current, thereby avoiding the problem caused by pulling the charger protection, and reducing the risk to the product reliability and battery safety.

[0093] In addition, in the case that it is checked that the lithium ion battery Pack does not enter the Shut Down mode, the BMS information can be read to determine whether the voltage of the lithium ion battery Pack is lower than the fast charging voltage threshold based on the read BMS information, that is, whether the voltage value of the target battery reaches the fast charging voltage threshold, so that when the voltage of the lithium ion battery Pack is lower than the fast charging voltage threshold, it can be determined that the voltage value of the target battery does not reach the fast charging voltage threshold, and then the charger can be controlled to maintain the output of the CV voltage value, and the pre-charging loop can be opened and the charging switch tube can be closed for small current charging, that is, the small current pre-charging loop is opened by the BMS to charge the lithium ion battery Pack with small current; and when the voltage of the lithium ion battery Pack is not lower than the fast charging voltage threshold, that is, when the battery voltage reaches the fast charging voltage threshold, the charger main control MCU sends a command to adjust the output voltage of the charger to the charging voltage threshold corresponding to the battery voltage information, so that the adjusted output voltage of the charger reaches the charging voltage threshold, and the BMS can detect the external voltage of the charger to determine the target charging voltage difference according to the detected external voltage of the charger and the voltage of the lithium ion battery Pack, so that the BMS can detect whether the voltage difference between the external voltage of the charger and the voltage of the lithium ion battery Pack is within the range of 5V to determine whether the target charging voltage difference meets the preset fast charging condition. If the target charging voltage difference is not within the range of 5V, it can be determined that the target charging voltage difference does not meet the preset fast charging condition, and then the BMS can maintain the CV voltage output of the charger to the lithium ion battery for small current pre-charging, and wait for the target charging voltage difference to drop down. When the target charging voltage difference is not higher than 5V, it can be determined that the target charging voltage difference meets the preset fast charging condition, and then the BMS can open the fast charging switch tube, that is, open the charging switch tube in the charging loop, to realize the switching of the charging mode, so as to switch from the small current pre-charging mode to the constant current charging mode, thereby solving the problem of sudden closing of the charge-discharge switch tube in the charging loop in the prior art due to the large voltage difference between the external charger voltage and the battery voltage, reducing the risk of large instantaneous current to product reliability and battery safety, and realizing safe and fast charging of the battery.

[0094] It can be seen that, in the example, when the voltage difference between the voltage outside the charger and the voltage of the lithium ion battery pack exceeds 5V, it is determined that the target charging voltage difference does not meet the preset fast charging condition, and then the pre-charge circuit can be opened by the BMS to store more energy on the output capacitor of the charger through the pre-charge circuit, and the output voltage of the charger can be maintained at the CV charging voltage value, so that the output voltage of the charger can be subsequently adjusted to the charging voltage threshold corresponding to the current voltage value of the target battery, thereby realizing fast charging of the lithium ion battery pack based on the charging voltage threshold. For example, in the case where the target voltage difference meets the preset fast charging condition, the output voltage of the charger can be set to a constant voltage based on the voltage value corresponding to the constant voltage charging mode, to control the charger to output a constant voltage for fast charging of the target battery, thereby realizing safe and fast charging of the battery. For another example, in the case where the target voltage difference meets the preset fast charging condition, the output current of the charger can be set to a constant current based on the current value corresponding to the constant current charging mode, to control the charger to output a constant current for fast charging of the target battery, thereby realizing safe and fast charging of the battery.

[0095] In summary, after the charger is powered on, the battery charging state corresponding to the target battery is determined. If the battery charging state is the target charging state, the battery voltage information corresponding to the target battery and the output voltage information of the charger are determined, and then the target charging voltage difference is determined according to the battery voltage information and the output voltage information, so that the target battery is pre-charged when the target charging voltage difference does not meet the preset fast charging condition, until the target charging voltage difference meets the preset fast charging condition, thereby reducing the large voltage difference between the charger and the battery, avoiding the risk of instantaneous large current, i.e. solving the problem caused by the large voltage difference between the charger and the battery in the prior art. When the target charging voltage difference meets the preset fast charging condition, the charge-discharge switch tube is switched to the open state to charge the target battery according to the constant charging mode corresponding to the open state, thereby realizing safe and fast charging, and further ensuring the service life and safety of the battery product

[0096] The example also provides a battery charging control system, as shown in Figure 5 The battery charging control system 500 provided by the example can include the following modules:

[0097] The battery charging state determination module 510 is configured to determine the battery charging state corresponding to the target battery after the charger is powered on;

[0098] The voltage information determination module 520 is configured to determine battery voltage information corresponding to the target battery and output voltage information of the charger when the battery charging state is a target charging state.

[0099] The voltage difference determination module 530 is configured to determine a target charging voltage difference according to the battery voltage information and the output voltage information.

[0100] The pre-charging processing module 540 is configured to perform pre-charging processing on the target battery until the target charging voltage difference meets the preset fast charging condition when the target charging voltage difference does not meet the preset fast charging condition.

[0101] The fast charging module 550 is configured to switch a charge-discharge switch tube state to an open state and charge the target battery according to a constant charging mode corresponding to the open state when the target charging voltage difference meets the preset fast charging condition.

[0102] Optionally, the battery charging state determination module 510 can include the following units.

[0103] The charge-discharge switch tube state determination unit is configured to determine a charge-discharge switch tube state corresponding to the target battery after the charger is powered on.

[0104] The non-target charging state determination unit is configured to determine that the battery charging state corresponding to the target battery is a non-target charging state when the charge-discharge switch tube state is an open state.

[0105] The target charging state determination unit is configured to determine that the battery charging state corresponding to the target battery is a target charging state when the charge-discharge switch tube state is a closed state, and the target charging state includes a hibernation charging state and / or a deep discharge charging state.

[0106] Optionally, the voltage information determination module 520 can include the following units.

[0107] The output voltage determination unit of the charger is configured to determine an output voltage of the charger based on the output voltage information when the battery voltage information meets a preset fast charging voltage condition.

[0108] The output voltage adjustment unit is configured to adjust the output voltage of the charger until the adjusted output voltage reaches a charging voltage threshold corresponding to the battery voltage information when the output voltage does not reach the charging voltage threshold.

[0109] The target charging voltage difference determination unit is configured to determine the target charging voltage difference based on the output voltage and the battery voltage information when the output voltage of the charger reaches the charging voltage threshold.

[0110] Optionally, the voltage difference determination module 530 can comprise the following units:

[0111] a target battery voltage value determination unit configured to determine a voltage value of the target battery based on the battery voltage information;

[0112] a fast charging voltage condition determination unit configured to determine that the battery voltage information meets a preset fast charging voltage condition when the voltage value of the target battery reaches a fast charging voltage threshold, and determine that the battery voltage information does not meet the preset fast charging voltage condition when the voltage value of the target battery does not reach the fast charging voltage threshold, and perform a pre-charging process on the target battery until the voltage value of the target battery reaches the fast charging voltage threshold.

[0113] Optionally, the fast charging module 550 can comprise the following units:

[0114] a constant charging mode determination unit configured to determine the constant charging mode based on the on state, wherein the constant charging mode comprises a constant current charging mode and / or a constant voltage charging mode of the charger;

[0115] a constant current charging unit configured to control the charger to charge the target battery based on a current value corresponding to the constant current charging mode; or,

[0116] a constant voltage charging unit configured to control the charger to charge the target battery based on a voltage value corresponding to the constant voltage charging mode.

[0117] Optionally, the voltage information determination module 520 can comprise the following units:

[0118] a battery management system information acquisition unit configured to acquire battery management system information corresponding to the target battery;

[0119] a voltage information extraction unit configured to extract the battery voltage information and the output voltage information of the charger from the battery management system information.

[0120] Optionally, the pre-charging process module 540 can comprise the following units:

[0121] a pre-charging unit configured to pre-charge the target battery through a pre-charging circuit corresponding to the target battery.

[0122] In specific implementations, the above battery charging control system can be applied in a battery charging control device, thereby reducing the large voltage difference between the charger and the battery, avoiding the risk of generating a large current instantaneously, i.e., solving the problem caused by the large voltage difference between the charger and the battery in the prior art, achieving safe and fast charging, and further ensuring the service life and safety of the battery product.

[0123] Further, the embodiment of the present application further provides a battery charging control device, comprising a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory complete mutual communication through the communication bus; the memory is used for storing a computer program; the processor is used for executing the program stored on the memory, and the steps of the battery charging control method described in any one of the method embodiments are realized.

[0124] The embodiment of the present application further provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to realize the steps of the battery charging control method described in any one of the embodiments of the first aspect.

[0125] It should be noted that, for the system, device and storage medium embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts are referred to the part of the method embodiments. Each embodiment in the present specification is described in a progressive manner, and each embodiment mainly describes the difference from other embodiments. The same parts of each embodiment are referred to each other.

[0126] In this document, terms such as "first" and "second" are used merely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply these entities or operations have any such actual relationship or order. Also, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0127] The above is only a specific embodiment of the present application, which enables those skilled in the art to understand or implement the present application. Various modifications of these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features applied herein.

Claims

1. A charge control method of a battery, characterized by, The method comprises the following steps: determining the battery charging state corresponding to the target battery after the charger is powered on; if the battery charging state is a target charging state, determining the battery voltage information corresponding to the target battery and the output voltage information of the charger; determining the target charging voltage difference according to the battery voltage information and the output voltage information, comprising: determining the output voltage of the charger based on the output voltage information after the battery voltage information meets the preset fast charging voltage condition; if the output voltage does not reach the charging voltage threshold corresponding to the battery voltage information, adjusting the output voltage of the charger until the adjusted output voltage reaches the charging voltage threshold; if the output voltage of the charger reaches the charging voltage threshold, determining the target charging voltage difference based on the output voltage and the battery voltage information; if the target charging voltage difference does not meet the preset fast charging condition, pre-charging the target battery until the target charging voltage difference meets the preset fast charging condition; if the target charging voltage difference meets the preset fast charging condition, switching the state of the charge-discharge switch tube to the open state, and charging the target battery according to the constant charging mode corresponding to the open state; wherein the preset fast charging condition includes a preset voltage difference threshold, and the method further comprises: in the case that the output voltage of the charger reaches the charging voltage threshold, determining whether the target charging voltage difference exceeds the voltage difference threshold; if the target charging voltage difference does not exceed the voltage difference threshold, it is determined that the target charging voltage difference meets the preset fast charging condition; if the target charging voltage difference exceeds the voltage difference threshold, it is determined that the target charging voltage difference does not meet the preset fast charging condition.

2. The method of claim 1, wherein, The method comprises the following steps: determining the battery charging state corresponding to the target battery after the charger is powered on; after the charger is inserted, determining the state of the charge-discharge switch tube corresponding to the target battery; if the state of the charge-discharge switch tube is the open state, determining that the battery charging state corresponding to the target battery is a non-target charging state; 3. The method of claim 1, wherein, if the state of the charge-discharge switch tube is the closed state, determining that the battery charging state corresponding to the target battery is a target charging state, which includes a hibernation charging state and / or an over-discharge charging state. The method comprises the following steps: obtaining the battery management system information corresponding to the target battery; 4. The method of claim 1, wherein, extracting the battery voltage information and the output voltage information of the charger from the battery management system information. Before determining the output voltage of the charger based on the output voltage information, the method further comprises: determining the current voltage value of the target battery based on the battery voltage information; 5. The method of claim 4, wherein, if the voltage value reaches the preset fast charging voltage threshold, it is determined that the battery voltage information meets the preset fast charging voltage condition. Before determining that the battery voltage information meets the preset fast charging voltage condition, the method further comprises: determining whether the voltage value reaches the preset fast charging voltage threshold; If the voltage value of the target battery does not reach the fast charging voltage threshold, it is determined that the battery voltage information does not meet the fast charging voltage condition, and the target battery is pre-charged until the voltage value of the target battery reaches the fast charging voltage threshold.

6. The method of claim 1, wherein, The constant charging mode corresponding to the open state is used to charge the target battery, including: Based on the open state, the constant charging mode is determined, which includes the constant current charging mode and / or the constant voltage charging mode of the charger; Based on the current value corresponding to the constant current charging mode, the charger is controlled to charge the target battery; or, Based on the voltage value corresponding to the constant voltage charging mode, the charger is controlled to charge the target battery.

7. The method according to any one of claims 1 to 6, characterized in that, The pre-charging process of the target battery includes: The target battery is pre-charged through the pre-charging circuit corresponding to the target battery.

8. A charge control system for a battery, characterized by It includes: Battery charging state determination module: used to determine the battery charging state corresponding to the target battery after the charger is inserted; Voltage information determination module: used to determine the battery voltage information corresponding to the target battery and the output voltage information of the charger when the battery charging state is the target charging state; Voltage difference determination module: used to determine the target charging voltage difference based on the battery voltage information and the output voltage information, including: determining the output voltage of the charger based on the output voltage information after the battery voltage information meets the preset fast charging voltage condition; if the output voltage does not reach the charging voltage threshold corresponding to the battery voltage information, the output voltage of the charger is adjusted until the adjusted output voltage reaches the charging voltage threshold; if the output voltage of the charger reaches the charging voltage threshold, the target charging voltage difference is determined based on the output voltage and the battery voltage information; Pre-charging processing module: used to pre-charge the target battery when the target charging voltage difference does not meet the preset fast charging condition until the target charging voltage difference meets the preset fast charging condition; Fast charging module: used to switch the state of the charge-discharge switch tube to the open state when the target charging voltage difference meets the preset fast charging condition, and charge the target battery according to the constant charging mode corresponding to the open state. The preset fast charging condition includes a preset voltage difference threshold, and the preset fast charging condition is used to determine whether the target charging voltage difference exceeds the voltage difference threshold when the output voltage of the charger reaches the charging voltage threshold; if the target charging voltage difference does not exceed the voltage difference threshold, it is determined that the target charging voltage difference meets the preset fast charging condition; if the target charging voltage difference exceeds the voltage difference threshold, it is determined that the target charging voltage difference does not meet the preset fast charging condition.

9. A charge control device of a battery, characterized by comprising: It includes a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other through the communication bus; The memory is used to store computer programs. A processor for implementing the steps of the method for controlling charging of a battery according to any one of claims 1-7 when executing a program stored on a memory.

10. A computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program, when executed by a processor, implements the steps of the method for controlling charging of a battery according to any one of claims 1-7.

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