New energy vehicle lead-acid battery charging method, device, storage medium and equipment

Abstract

This invention relates to the field of automotive batteries, and more particularly to a method, apparatus, storage medium, and device for charging lead-acid batteries for new energy vehicles. The method includes: collecting battery status information and sending it to a master node controller; the master node controller setting an initial DC-DC low-voltage output voltage based on the battery temperature; charging with the initial output voltage, collecting battery status information and sending it to the master node controller; the master node controller initially setting the DC-DC low-voltage output voltage based on the battery temperature, battery charging current, and a charging strategy; charging with the initially set output voltage, continuously collecting battery status information and sending it to the master node controller; the master node controller adjusting the DC-DC low-voltage output voltage in real time based on the battery status information and the charging strategy; charging with the real-time adjusted output voltage while maintaining the battery charging current within a target range. This invention introduces a new charging strategy and controls the battery charging current, better meeting application requirements.

Description

Technical Field

[0001] This invention relates to the field of automotive battery technology, and in particular to a charging method, apparatus, storage medium, and equipment for lead-acid batteries used in new energy vehicles. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] Currently, most lead-acid battery charging solutions for new energy vehicles fall into two categories: a. long-term constant voltage charging; b. setting a charging MAP (State of Charge - Charging Voltage) and charging according to the charging MAP.

[0004] Both of these charging methods currently have certain shortcomings:

[0005] a. Long-term constant voltage charging: When the battery power is low, constant voltage charging will lead to excessive charging current, rapid battery temperature rise, water loss, and affect battery life.

[0006] b. Set the SOC-charging voltage charging MAP and charge according to the charging MAP. The range of SOC and charging voltage set in the MAP is large. Due to the limited accuracy of battery power calculation, inaccurate battery power calculation will cause overcharging or undercharging of the battery, which will affect the battery life and battery charging efficiency.

[0007] In view of the above-mentioned defects, the present invention has made improvements. Summary of the Invention

[0008] To overcome the shortcomings of the prior art, the present invention provides a charging method, apparatus, storage medium and equipment for lead-acid batteries of new energy vehicles. By introducing a new charging strategy and effectively controlling the battery charging current, it can effectively solve the problems of shortened battery life caused by overcharging of lead-acid batteries and slow battery charging caused by undervoltage, and can better meet the needs of practical applications.

[0009] To achieve the above objectives, the present invention provides the following technical solution:

[0010] In a first aspect, a method for charging a lead-acid battery for a new energy vehicle is provided, the method comprising:

[0011] The battery status information is collected and sent to the master node controller. The battery status information includes battery voltage, battery temperature, battery charging current and battery charge. The master node controller sets the initial output voltage of the DC-DC low voltage terminal according to the battery temperature.

[0012] The battery is charged using the initial output voltage. Battery status information is collected and sent to the master node controller. The master node controller sets the output voltage of the DC-DC low-voltage side for the first time based on the battery temperature, battery charging current and charging strategy.

[0013] The battery is charged using the initially set output voltage. Battery status information is continuously collected and sent to the master node controller. The master node controller adjusts the output voltage of the DC-DC low-voltage side in real time according to the battery status information and the charging strategy. The battery is charged using the real-time adjusted output voltage, and the battery charging current is kept within the target range.

[0014] Furthermore,

[0015] The charging strategy includes a first charging strategy and a second charging strategy. The first charging strategy is applicable to battery temperatures above 0°C, and the second charging strategy is applicable to battery temperatures below 0°C.

[0016] The first charging strategy determines the corresponding output voltage of the DC-DC low-voltage side based on the battery temperature above 0°C and the battery charging current.

[0017] The second charging strategy determines the corresponding output voltage of the DC-DC low-voltage side based on the battery temperature below 0°C and the battery charging current.

[0018] Furthermore,

[0019] The first charging strategy includes:

[0020] When the battery charging current is >0.25C, the master node controller uses the initial output voltage corresponding to the battery temperature as the output voltage of the DC-DC low voltage terminal, and adjusts it in real time by decreasing by 0.2V every 30s.

[0021] When the battery charging current is ≤0.25C, the master node controller determines a preset fixed voltage value as the output voltage of the DC-DC low voltage terminal based on the battery temperature and battery charging current.

[0022] Where C represents the rated capacity of the battery.

[0023] Furthermore,

[0024] The second charging strategy includes:

[0025] When the battery charging current is >0.25C, the master node controller uses the initial output voltage corresponding to the battery temperature as the output voltage of the DC-DC low voltage terminal, and adjusts it in real time by decreasing by 0.2V every 30s.

[0026] When 1A < battery charging current ≤ 0.2C, the master node controller uses the initial output voltage corresponding to the battery temperature as the output voltage of the DC-DC low voltage terminal, and adjusts it in real time by increasing it by 0.2V every 30s;

[0027] When the battery charging current is ≤1A or 0.2C < battery charging current ≤0.25C, the master node controller determines a preset fixed voltage value as the output voltage of the DC-DC low voltage terminal based on the battery temperature and battery charging current.

[0028] Where C represents the rated capacity of the battery.

[0029] Furthermore,

[0030] The battery status information is collected by a battery sensor.

[0031] Furthermore,

[0032] The charging strategy includes a fault charging strategy.

[0033] If the battery sensor experiences an internal fault, it sends an internal fault signal to the master node controller. The master node controller then uses a preset fault voltage value as the output voltage of the DC-DC low-voltage terminal according to the fault charging strategy.

[0034] Furthermore,

[0035] The output voltage of the low-voltage end of the DC-DC converter is adjustable and the transformer accuracy is ≤0.1V.

[0036] Secondly, a charging device for lead-acid batteries in new energy vehicles is also provided, the device comprising:

[0037] The initial voltage setting module is used to send the collected battery status information to the master node controller. The battery status information includes battery voltage, battery temperature, battery charging current and battery power. It is also used to enable the master node controller to set the initial output voltage of the DC-DC low voltage terminal according to the battery temperature.

[0038] The voltage initial adjustment module is used to charge the battery with the initial output voltage and send the collected battery status information to the master node controller. It is also used to enable the master node controller to initially set the output voltage of the DC-DC low voltage end according to the battery temperature, battery charging current and charging strategy.

[0039] The real-time voltage adjustment module is used to charge the battery with the initially set output voltage and send the continuously collected battery status information to the master node controller. It is also used to enable the master node controller to adjust the output voltage of the DC-DC low-voltage side in real time according to the battery status information and in combination with the charging strategy. Furthermore, it is used to charge the battery with the real-time adjusted output voltage and keep the battery charging current within the target range.

[0040] Based on the same inventive concept, the present invention also provides a computer-readable storage medium storing one or more programs, which, when executed, can realize the aforementioned charging method for lead-acid batteries of new energy vehicles.

[0041] Based on the same inventive concept, the present invention also provides an electronic device, including a processor, a communication interface, a computer-readable storage medium as described above, and a communication bus; wherein the processor, the communication interface, and the computer-readable storage medium communicate with each other through the communication bus; the processor is used to execute a program stored in the computer-readable storage medium.

[0042] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0043] The present invention can reduce the low-voltage power consumption of the vehicle in the battery charging scenario, reduce water loss during battery charging, and improve battery life and battery charging efficiency at low temperature, thus better meeting the needs of practical applications.

[0044] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description, claims and drawings.

[0045] The invention will now be further described with reference to the accompanying drawings. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the 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.

[0047] Figure 1 This is a schematic flowchart of a charging method for lead-acid batteries in new energy vehicles according to an embodiment of the present invention.

[0048] Figure 2 This is a block diagram of the charging structure of a lead-acid battery for a new energy vehicle according to an embodiment of the present invention;

[0049] Figure 3 This is a schematic diagram of the structure of a new energy vehicle lead-acid battery charging device according to an embodiment of the present invention.

[0050] Figure 4 This is a schematic diagram of the structure of an electronic device according to an embodiment of the present invention. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0052] like Figures 1 to 2 As shown, the first embodiment of the present invention provides a charging method for lead-acid batteries of new energy vehicles, the method comprising the following steps:

[0053] S1. Collect battery status information and send it to the master node controller. The battery status information includes battery voltage, battery temperature, battery charging current and battery power. The master node controller sets the initial output voltage of the DC-DC low voltage terminal according to the battery temperature.

[0054] In this step, the master node controller acquires the battery temperature and determines the initial output voltage of the DC-DC low-voltage terminal based on the battery temperature. In this embodiment, acquiring the battery voltage is used to confirm the current battery voltage of the vehicle and to support the following charging strategies; acquiring the battery charge is used to calculate the battery charge and to confirm the current battery charge level of the vehicle. In this embodiment, the initial output voltage of the DC-DC low-voltage terminal is the initial charging voltage.

[0055] After the vehicle starts, the battery sensor sends the battery temperature to the master node controller. The master node controller looks up the table (i.e., the initial charging voltage MAP) to obtain the initial charging voltage. Then, the master node controller requests DC-DC charging according to the initial charging voltage.

[0056] S2. The battery is charged using the initial output voltage. Battery status information is collected and sent to the master node controller. The master node controller sets the output voltage of the DC-DC low-voltage side for the first time based on the battery temperature, battery charging current and charging strategy.

[0057] In this step, the battery is charged using the initial output voltage set in step S1. Based on the battery temperature, battery charging current and other information collected under the initial output voltage, and in conjunction with the charging strategy, the charging voltage (i.e., the output voltage of the DC-DC low-voltage end, the same below) is initially adjusted.

[0058] S3. The battery is charged using the initially set output voltage. Battery status information is continuously collected and sent to the master node controller. The master node controller adjusts the output voltage of the DC-DC low-voltage end in real time according to the battery status information and the charging strategy. The battery is charged using the real-time adjusted output voltage, and the battery charging current is kept within the target range.

[0059] In this step, the master node controller references the feedback battery voltage and charge level, combines the charging strategy, and adjusts the output voltage of the DC-DC low-voltage side in real time based on the feedback battery temperature and charging current. This step continues to adjust the charging voltage in real time based on the initial adjustment of the charging voltage and battery charging current, thereby controlling the battery charging current to keep it within the target range until charging is complete. Keeping the battery charging current within the target range means maintaining the battery charging current within the optimal range. The target range is a range set based on the characteristics of the battery, and the range varies for different batteries.

[0060] In the above technical solution, by introducing a new charging strategy and effectively controlling the battery charging current, the problems of shortened battery life caused by overcharging of automotive lead-acid batteries and slow battery charging caused by undervoltage can be effectively solved, thus better meeting practical application needs. It should be noted that the batteries in the embodiments of this invention all refer to lead-acid batteries.

[0061] Figure 2 In this context, the master node controller is abbreviated as master node, and DC-DC is abbreviated as DCDC, which provides high voltage to DC-DC through the power battery.

[0062] In this embodiment, the master node controller adjusts the DC-DC low-voltage output voltage command based on the battery temperature and current, referring to the charging strategy. The DC-DC controller adjusts the low-voltage output voltage to keep the battery charging current within a set range (i.e., the target range). In this embodiment, the master node controller adjusts the DC-DC low-voltage output voltage in real time every 30 seconds. Specifically, the master node controller adjusts the battery charging voltage (referencing the target voltage) every 30 seconds based on the battery temperature and charging current, while continuously collecting the battery charging current and temperature to keep the battery charging current within the target range.

[0063] In step S1 of this embodiment, the master node controller sets the initial output voltage of the DC-DC low-voltage terminal according to the battery temperature, specifically based on the initial charging voltage MAP. The initial charging voltage MAP of this embodiment is shown in Table 1 below, which illustrates the correspondence between the battery temperature range and the initial charging voltage. The initial charging voltage determined in the initial charging voltage MAP of this embodiment is a baseline charging voltage selected by combining charging efficiency and battery life.

[0064] Table 1 Initial Charging Voltage (MAP)

[0065] Battery temperature Initial charging voltage / V T≤-20℃ 15.6V -20℃＜T≤0℃ 14.8V 0℃＜T≤40℃ 14.8V 40℃＜T≤60℃ 14.4V 60℃＜T 14.OV

[0066] Specifically, in this embodiment, the battery charging current control is implemented as follows: the collected battery charging current is fed back to the master node controller, and the master node controller increases or decreases the battery charging current by adjusting the output voltage of the DC-DC low-voltage terminal to ensure that the battery charging current is within the set range.

[0067] As a preferred technical solution, the charging strategy includes a first charging strategy and a second charging strategy. The first charging strategy is applicable to battery temperatures above 0°C, and the second charging strategy is applicable to battery temperatures below 0°C. The first charging strategy determines the corresponding output voltage of the DC-DC low-voltage terminal based on the battery temperature above 0°C and the battery charging current. The second charging strategy determines the corresponding output voltage of the DC-DC low-voltage terminal based on the battery temperature below 0°C and the battery charging current.

[0068] Under the same power conditions, the higher the voltage, the greater the charging current. Different charging voltages are adjusted based on feedback from the battery charging current to control the battery charging current within the target range. This embodiment of the invention formulates a charging strategy based on the above two criteria. Specifically, when the battery temperature is above 0°C, the charging current is relatively large. To ensure battery life, it is necessary to consider reducing the current and gradually decreasing the voltage. This embodiment formulates a first charging strategy suitable for batteries with temperatures above 0°C. Below 0°C, the charging current is small. To improve charging efficiency, it is necessary to consider gradually increasing the voltage. This embodiment formulates a second charging strategy suitable for batteries with temperatures below 0°C. Both the first and second charging strategies determine the corresponding output voltage at the low-voltage end of the DC-DC converter based on the battery temperature and the battery charging current.

[0069] As a preferred technical solution, the first charging strategy includes: when the battery charging current > 0.25C, the master node controller uses an initial output voltage corresponding to the battery temperature as the output voltage of the DC-DC low-voltage terminal, and adjusts it in real time by decreasing by 0.2V every 30s; when the battery charging current ≤ 0.25C, the master node controller determines a corresponding preset fixed voltage value as the output voltage of the DC-DC low-voltage terminal based on the battery temperature and battery charging current; where C represents the rated capacity of the battery.

[0070] In this embodiment, C represents the rated capacity of the battery. For example, if the rated capacity of the battery is 70Ah, a charging current of 0.25C means charging at a current of 0.25 * 70Ah. The meaning of C in the following text is the same. Generally, the charging and discharging current is expressed as (rate multiplied by capacity). Here, 0.25C (where 0.25 represents the rate and C represents the capacity, such as 0.25 * 70Ah) only expresses the current magnitude and has no physical relationship; that is, only the numerical value is considered, not the unit. In this embodiment, the initial output voltage corresponding to the battery temperature is also determined based on the aforementioned initial charging voltage MAP. The initial output voltage is used as the output voltage of the DC-DC low-voltage terminal to charge the battery. The corresponding battery charging current is the initial charging current. If the initial charging current > 0.25C, the charging voltage needs to be reduced to lower the charging current because the higher the charging current, the higher the battery temperature, and the stronger the harmful side reactions during charging, affecting the battery life. If the initial charging current ≤ 0.25C, a corresponding preset fixed voltage value is directly used as the output voltage of the DC-DC low-voltage terminal.

[0071] As a preferred technical solution, the second charging strategy includes: when the battery charging current > 0.25C, the master node controller uses an initial output voltage corresponding to the battery temperature as the output voltage of the DC-DC low-voltage terminal, and adjusts it in real time by decreasing by 0.2V every 30s; when 1A < battery charging current ≤ 0.2C, the master node controller uses an initial output voltage corresponding to the battery temperature as the output voltage of the DC-DC low-voltage terminal, and adjusts it in real time by increasing by 0.2V every 30s; when the battery charging current ≤ 1A or 0.2C < battery charging current ≤ 0.25C, the master node controller determines a corresponding preset fixed voltage value as the output voltage of the DC-DC low-voltage terminal based on the battery temperature and battery charging current; where C represents the rated capacity of the battery.

[0072] In this embodiment, the initial output voltage corresponding to the battery temperature is also determined based on the aforementioned initial charging voltage MAP. The initial output voltage is used as the output voltage of the DC-DC low-voltage terminal to charge the battery. The corresponding battery charging current is the initial charging current. If the initial charging current > 0.25C, the charging voltage needs to be reduced to decrease the charging current, because the higher the charging current, the higher the battery temperature, and the stronger the harmful side reactions during charging, which affects the battery life. If 1A < initial charging current ≤ 0.2C, the charging voltage needs to be increased to increase the charging current, because the higher the charging current, the higher the charging efficiency. If the initial charging current ≤ 1A or 0.2C < initial charging current ≤ 0.25C, a corresponding preset fixed voltage value is directly used as the output voltage of the DC-DC low-voltage terminal.

[0073] To make the above charging strategy clearer and more intuitive, the charging strategy is shown in Table 2 below.

[0074] Table 2 shows the first charging strategy (i.e., the charging strategy above 0°C) and the second charging strategy (i.e., the charging strategy below 0°C), as well as the fault charging strategy mentioned below.

[0075] Table 2 Charging Strategy

[0076]

[0077] In Table 2: I represents the battery charging current; C represents the battery rated capacity.

[0078] As a preferred technical solution, the battery status information is collected through a battery sensor. In this embodiment, the battery status information, including the battery's current, voltage, temperature, and charge data, is collected and processed through an AFE (Aspect-Free Edge) sampling chip.

[0079] As a preferred technical solution, the charging strategy includes a fault charging strategy; if the battery sensor experiences an internal fault, the battery sensor sends an internal fault signal to the master node controller, and the master node controller uses a preset fault voltage value as the output voltage of the DC-DC low-voltage terminal according to the fault charging strategy.

[0080] Considering the possibility of battery sensor failures in practice, this embodiment incorporates a fault-handling charging strategy into the charging policy. The preset fault voltage value in this embodiment is a fixed value, preferably 14.4V. At this voltage, the charging current will be lower, but it will better protect the battery. In this embodiment, internal battery sensor failures mainly refer to faults related to data acquisition, data calibration, data standardization, and communication within the battery sensor itself.

[0081] In some embodiments, the battery sensor communicates with the master node controller via LIN or CAN communication. Using LIN or CAN communication effectively transmits the collected battery status information back to the master node controller.

[0082] As a preferred technical solution, the output voltage of the low-voltage end of the DC-DC converter is adjustable with a transformation accuracy of ≤0.1V. Adjustable output voltage at the low-voltage end of the DC-DC converter is existing technology and can be achieved with existing products. Higher transformation accuracy at the low-voltage end of the DC-DC converter allows for finer current regulation. In this embodiment, the charging strategy table requires a 0.2V decrease or increase within 30 seconds, and a transformation accuracy of ≤0.1V ensures the charging current quickly reaches the specified range. Current DC-DC converters can achieve a transformation accuracy of 0.05V, meaning that current market DC-DC technology meets the transformation accuracy requirements of this embodiment.

[0083] The following is a brief explanation of some of the principles involved in the method of the embodiments of the present invention (mainly including the battery charging process and the low-voltage power consumption of the whole vehicle).

[0084] 1. The charging process of a storage battery:

[0085] a. When a battery is being charged in a depleted state, the voltage difference between the external voltage and the battery body voltage is large, the charging reaction is violent, the charging current is too high, the charging side reaction is aggravated, and the H2O in the electrolyte is consumed by electrolysis, causing the battery electrolyte to dry out and fail. At this time, reducing the charging voltage, reducing the voltage difference, and reducing the charging side reaction are beneficial to the battery life.

[0086] b. Charging at high temperatures leads to violent electrochemical reactions and intensified charging side reactions. The H2O in the electrolyte is consumed by electrolysis, causing the battery electrolyte to dry out and fail. In this case, reducing the charging voltage can reduce charging side reactions and benefit the battery life.

[0087] c. Charging at low temperatures results in sluggish electrochemical reactions and low charging currents. Prolonged use can lead to insufficient battery charging and battery sulfation failure. In this case, increasing the external voltage accelerates the electrochemical reaction, improves battery charging efficiency, and quickly increases battery capacity.

[0088] 2. Vehicle low-voltage power consumption: During the high-voltage period of the vehicle, the output power of the DC-DC low-voltage terminal is affected by the output voltage of the DC-DC low-voltage terminal. When the battery charging acceptance decreases (fully charged), the low-voltage terminal output voltage can be reduced, thereby reducing the vehicle's low-voltage power consumption.

[0089] Therefore, it can be seen that the new energy vehicle lead-acid battery charging method of the present invention can reduce the low-voltage power consumption of the whole vehicle in the battery charging scenario, reduce water loss during battery charging, and improve battery life and battery charging efficiency at low temperature, which can better meet the needs of practical applications.

[0090] The second embodiment of the present invention provides a charging device for lead-acid batteries of new energy vehicles, such as... Figure 3 As shown, the device includes:

[0091] The initial voltage setting module is used to send the collected battery status information to the master node controller. The battery status information includes battery voltage, battery temperature, battery charging current and battery power. It is also used to enable the master node controller to set the initial output voltage of the DC-DC low voltage terminal according to the battery temperature.

[0092] The voltage initial adjustment module is used to charge the battery with the initial output voltage and send the collected battery status information to the master node controller. It is also used to enable the master node controller to initially set the output voltage of the DC-DC low voltage end according to the battery temperature, battery charging current and charging strategy.

[0093] The real-time voltage adjustment module is used to charge the battery with the initially set output voltage and send the continuously collected battery status information to the master node controller. It is also used to enable the master node controller to adjust the output voltage of the DC-DC low-voltage side in real time according to the battery status information and in combination with the charging strategy. Furthermore, it is used to charge the battery with the real-time adjusted output voltage and keep the battery charging current within the target range.

[0094] Regarding the apparatus in the above embodiments, the specific manner in which each unit module performs its operations has been described in detail in the embodiments related to the method, and will not be elaborated upon here.

[0095] Based on the same inventive concept, the present invention also provides a computer-readable storage medium storing one or more programs, which, when executed, can realize the aforementioned charging method for lead-acid batteries of new energy vehicles.

[0096] Based on the same inventive concept, the present invention also provides an electronic device, such as... Figure 4 As shown, it includes a processor, a communication interface, a computer-readable storage medium as described above, and a communication bus; wherein the processor, the communication interface, and the computer-readable storage medium communicate with each other via the communication bus; the processor is used to execute a program stored in the computer-readable storage medium.

[0097] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of modules is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple modules or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or modules may be electrical, mechanical, or other forms.

[0098] The modules described as separate components may or may not be physically separate. The components shown as modules may or may not be physical modules; that is, they may be located in one place or distributed across multiple network modules. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Furthermore, the functional modules in the various embodiments of this invention can be integrated into one processing module, or each module can exist physically separately, or two or more modules can be integrated into one module. The integrated modules described above can be implemented in hardware or as software functional modules.

[0099] If the integrated module is implemented as a software functional module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0100] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that the present invention is not limited to the described order of actions, because according to the present invention, some steps can be performed in other orders or simultaneously. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to the present invention.

[0101] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0102] The parts not mentioned in the above embodiments are the same as or can be implemented using existing technologies, and will not be further described here.

[0103] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for charging lead-acid batteries for new energy vehicles, characterized in that, The method includes: The battery status information is collected and sent to the master node controller. The battery status information includes battery voltage, battery temperature, battery charging current and battery charge. The master node controller sets the initial output voltage of the DC-DC low voltage terminal according to the battery temperature. The battery is charged using the initial output voltage. Battery status information is collected and sent to the master node controller. The master node controller sets the output voltage of the DC-DC low-voltage side for the first time based on the battery temperature, battery charging current and charging strategy. The battery is charged using the initially set output voltage. Battery status information is continuously collected and sent to the master node controller. The master node controller adjusts the output voltage of the DC-DC low-voltage end in real time according to the battery status information and the charging strategy. The battery is charged using the real-time adjusted output voltage, and the battery charging current is kept within the target range. The charging strategy includes a first charging strategy and a second charging strategy. The first charging strategy is applicable to battery temperatures above 0°C, and the second charging strategy is applicable to battery temperatures below 0°C. The first charging strategy determines the corresponding output voltage of the DC-DC low-voltage side based on the battery temperature above 0°C and the battery charging current. The first charging strategy includes: When the battery charging current is greater than 0.25C, the master node controller uses the initial output voltage corresponding to the battery temperature as the output voltage of the DC-DC low voltage terminal, and adjusts it in real time by decreasing by 0.2V every 30s. When the battery charging current is ≤0.25C, the master node controller determines a preset fixed voltage value as the output voltage of the DC-DC low voltage terminal based on the battery temperature and battery charging current. Where C represents the rated capacity of the battery; The second charging strategy determines the corresponding output voltage of the DC-DC low-voltage side based on the battery temperature below 0°C and the battery charging current.

2. The charging method for lead-acid batteries in new energy vehicles according to claim 1, characterized in that, The second charging strategy includes: When the battery charging current is greater than 0.25C, the master node controller uses the initial output voltage corresponding to the battery temperature as the output voltage of the DC-DC low voltage terminal, and adjusts it in real time by decreasing by 0.2V every 30s. When 1A < battery charging current ≤ 0.2C, the master node controller uses the initial output voltage corresponding to the battery temperature as the output voltage of the DC-DC low voltage terminal, and adjusts it in real time by increasing it by 0.2V every 30s. When the battery charging current is ≤1A or 0.2C < battery charging current ≤0.25C, the master node controller determines a preset fixed voltage value as the output voltage of the DC-DC low voltage terminal based on the battery temperature and battery charging current. Where C represents the rated capacity of the battery.

3. A charging method for lead-acid batteries in new energy vehicles according to claim 1 or 2, characterized in that, The battery status information is collected by a battery sensor.

4. The charging method for lead-acid batteries in new energy vehicles according to claim 3, characterized in that, The charging strategy includes a fault charging strategy. If the battery sensor experiences an internal fault, it sends an internal fault signal to the master node controller. The master node controller then uses a preset fault voltage value as the output voltage of the DC-DC low-voltage terminal according to the fault charging strategy.

5. A charging method for lead-acid batteries in new energy vehicles according to claim 1, characterized in that, The output voltage of the low-voltage end of the DC-DC converter is adjustable and the transformer accuracy is ≤0.1V.

6. A charging device for lead-acid batteries in new energy vehicles, characterized in that, The device includes: The initial voltage setting module is used to send the collected battery status information to the master node controller. The battery status information includes battery voltage, battery temperature, battery charging current and battery power. It is also used to enable the master node controller to set the initial output voltage of the DC-DC low voltage terminal according to the battery temperature. The voltage initial adjustment module is used to charge the battery with the initial output voltage and send the collected battery status information to the master node controller. It is also used to enable the master node controller to initially set the output voltage of the DC-DC low voltage end according to the battery temperature, battery charging current and charging strategy. The real-time voltage adjustment module is used to charge the battery with the initially set output voltage and send the continuously collected battery status information to the master node controller. It is also used to enable the master node controller to adjust the output voltage of the DC-DC low-voltage end in real time according to the battery status information and in combination with the charging strategy. It is also used to charge the battery with the real-time adjusted output voltage and keep the battery charging current within the target range. The charging strategy includes a first charging strategy and a second charging strategy. The first charging strategy is applicable to battery temperatures above 0°C, and the second charging strategy is applicable to battery temperatures below 0°C. The first charging strategy determines the corresponding output voltage of the DC-DC low-voltage side based on the battery temperature above 0°C and the battery charging current. The first charging strategy includes: When the battery charging current is greater than 0.25C, the master node controller uses the initial output voltage corresponding to the battery temperature as the output voltage of the DC-DC low voltage terminal, and adjusts it in real time by decreasing by 0.2V every 30s. When the battery charging current is ≤0.25C, the master node controller determines a preset fixed voltage value as the output voltage of the DC-DC low voltage terminal based on the battery temperature and battery charging current. Where C represents the rated capacity of the battery; The second charging strategy determines the corresponding output voltage of the DC-DC low-voltage side based on the battery temperature below 0°C and the battery charging current.

7. A computer-readable storage medium storing one or more programs, characterized in that, When one or more of the programs are executed, the charging method for lead-acid batteries of new energy vehicles as described in any one of claims 1-5 is implemented.

8. An electronic device comprising a processor, a communication interface, a computer-readable storage medium as described in claim 7, and a communication bus; wherein, The processor, communication interface, and computer-readable storage medium communicate with each other via a communication bus; Its features are, The processor is used to execute programs stored in a computer-readable storage medium.

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