Battery charging control method, system and electric vehicle

Abstract

The application provides a battery charging control method, a system and an electric vehicle. The battery charging control method comprises the following steps: determining whether the battery is in a state of being ready to be charged according to a detected terminal voltage of the battery; and determining a duty cycle of positive pulse width modulation in a positive and negative pulse charging mode when the battery is being charged according to a detected temperature of the battery and a detected ambient temperature, and determining a charging voltage in an intermittent floating charging mode when the battery is being charged. The battery charging control method provided by the application adopts the positive and negative pulse charging mode and the intermittent floating charging mode, solves the problem of single charging mode existing in the prior art, and improves the charging efficiency of the battery.

Description

Technical Field

[0001] This application relates to the field of electric vehicle charging management technology, and more specifically, to a battery charging control method, system, and electric vehicle. Background Technology

[0002] Currently, with increasing attention being paid to environmental protection and energy issues, the research and development and large-scale use of electric vehicles have become an inevitable trend in order to address the environmental and energy crises. Electric vehicles that currently use lead-acid batteries as their sole power source have advantages such as ease of maintenance, low cost, and stable voltage characteristics.

[0003] However, electric vehicles currently using lead-acid batteries suffer from problems such as limited charging equipment functionality, limited charging modes, low charging efficiency, or short battery lifespan. Summary of the Invention

[0004] This application addresses the shortcomings of existing methods by proposing a battery charging control method, system, and electric vehicle to solve the technical problems of single charging mode, low charging efficiency, or short lifespan of lead-acid batteries in the prior art.

[0005] In a first aspect, embodiments of this application provide a battery charging control method, comprising the following steps:

[0006] Based on the detected battery terminal voltage, determine whether the battery is in a state of needing to be charged;

[0007] If the battery is in a standby state, the duty cycle of the positive pulse width modulation in the positive and negative pulse charging modes during battery charging is determined based on the detected battery temperature and the detected ambient temperature, and the charging voltage in the intermittent float charging mode during battery charging is also determined.

[0008] Optionally, determining whether the battery is in a state of waiting to be charged includes: comparing the detected terminal voltage with a preset undervoltage threshold; if the terminal voltage is less than or equal to the undervoltage threshold, then determining that the battery is in a state of waiting to be charged.

[0009] Optionally, when the duty cycle of the positive pulse width modulation in the positive and negative pulse charging mode is determined during battery charging, the charging voltage in the positive and negative pulse charging mode is determined according to the duty cycle of the positive pulse width modulation, and the power supply is controlled to charge the battery with the charging voltage in the positive and negative pulse charging mode.

[0010] Optionally, the duty cycle of the positive pulse width modulation is 85%-90%.

[0011] Optionally, when the charging voltage in the positive and negative pulse charging mode exceeds a preset threshold, the positive and negative pulse charging mode is stopped, and the power supply is controlled to charge the battery with the charging voltage in the intermittent float charging mode.

[0012] Secondly, embodiments of this application provide a battery charging system, including: a control unit, a voltage detection unit, a temperature detection unit, and a memory;

[0013] The voltage detection unit, temperature detection unit, and memory are all communicatively connected to the control unit.

[0014] The voltage detection unit is used to detect the battery's supply voltage and charging voltage.

[0015] The temperature detection unit is used to detect the temperature of the battery when it is charging and the ambient temperature.

[0016] The memory stores at least one program for configuring the battery charging control method provided in the first aspect of this application to be executed by the control unit.

[0017] Optionally, the battery charging system also includes: a current detection unit and an alarm unit; both the current detection unit and the alarm unit are communicatively connected to the control unit;

[0018] The current detection unit is used to detect the battery's supply current and charging current.

[0019] Alarm unit, used to output warning information.

[0020] Optionally, the battery charging system also includes an auxiliary power supply, which is electrically connected to the control unit and is used to provide power to the control unit;

[0021] The voltage detection unit is connected to the auxiliary power supply and is used to detect the voltage of the auxiliary power supply.

[0022] Optionally, the battery charging system also includes a main power switching unit, which is communicatively connected to the control unit;

[0023] The main power switching unit is used to drive the power transistor circuit; the power transistor circuit is electrically connected to the main power switching unit, the battery, and the power supply respectively.

[0024] The main power switching unit receives the command information from the control unit and drives the power transistor circuit to realize the charging mode of positive and negative pulse charging and intermittent float charging for the battery by the power supply.

[0025] Thirdly, embodiments of this application provide an electric vehicle, including: a battery, a power supply, a power transistor circuit, and a battery charging system provided in the second aspect of this application;

[0026] The battery charging system is connected to both the battery and the power transistor circuit, and the battery is connected to the power supply through the power transistor circuit.

[0027] The beneficial technical effects of the technical solutions provided in this application include:

[0028] The battery charging control method provided in this application determines whether the battery is in a state of needing to be charged based on the detected battery terminal voltage; and determines the duty cycle of the positive pulse width modulation in the positive and negative pulse charging mode and the charging voltage in the intermittent float charging mode based on the detected battery temperature and the detected ambient temperature. This battery charging control method employs both positive and negative pulse charging and intermittent float charging modes, solving the problem of a single charging mode in existing automotive battery charging methods and improving battery charging efficiency.

[0029] Additional aspects and advantages of this application will be set forth in part in the description which follows, and will become apparent from the description or may be learned by practice of this application. Attached Figure Description

[0030] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0031] Figure 1 This is a schematic diagram of a battery charging system provided in an embodiment of this application;

[0032] Figure 2 This is a flowchart illustrating a battery charging control method provided in an embodiment of this application.

[0033] Figure 3 A schematic flowchart illustrating a battery charging control method provided in an embodiment of this application;

[0034] Detailed explanation of the reference numerals in the attached figures:

[0035] 10-Control unit; 20-Voltage detection unit; 30-Temperature detection unit; 40-Memory; 50-Current detection unit; 60-Alarm unit; 70-Auxiliary power supply; 80-Main power switch unit;

[0036] 100 - Battery charging system; 200 - Battery; 300 - Power transistor circuit; 400 - Power supply. Detailed Implementation

[0037] This application is described in detail below. Examples of embodiments of this application are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. Furthermore, detailed descriptions of known technologies that are unnecessary for the features of this application are omitted. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0038] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0039] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in this application means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is “connected” or “coupled” to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. Furthermore, “connected” or “coupled” as used herein can include wireless connections or wireless coupling. The term “and / or” as used herein includes all or any units and all combinations of one or more associated listed items.

[0040] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments.

[0041] This application provides a battery charging system 100, the structural schematic diagram of which is shown below. Figure 1 As shown, it includes: a control unit 10, a voltage detection unit 20, a temperature detection unit 30, and a memory 40; the voltage detection unit 20, the temperature detection unit 30, and the memory 40 are all communicatively connected to the control unit 10.

[0042] The voltage detection unit 20 is used to detect the supply voltage and charging voltage of the battery 200; the temperature detection unit 30 is used to detect the temperature of the battery 200 when it is in the charging state and the ambient temperature; the memory 40 stores at least one program, which is used to configure the battery charging control method provided in this application to be executed by the control unit 10 (the method will be described in detail later).

[0043] Specifically, the control unit 10 includes a processor, which may be a CPU (Central Processing Unit), a general-purpose processor, a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It can implement or execute various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure of this application. The processor may also be a combination that implements computational functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, etc. In this embodiment, the control unit 10 is a TMS320F2812 digital signal processor.

[0044] The voltage detection unit 20 includes two 0V-50V voltage acquisition units, which are used to acquire the power supply voltage and the charging voltage of the battery 200, respectively, to realize voltage monitoring of the battery 200.

[0045] The temperature detection unit 30 includes two B3950 type temperature sensors. One is disposed on the surface of the battery 200 to collect the temperature of the battery 200; the other is disposed away from the battery 200 to ensure more accurate collection of ambient temperature. The temperature sensors transmit the collected temperature data to the control unit 10 at regular intervals.

[0046] The memory 40 can be a ROM (Read-Only Memory) or other type of static storage device capable of storing static information and instructions, RAM (Random Access Memory) or other type of dynamic storage device capable of storing information and instructions, or it can be an EEPROM (Electrically Erasable Programmable Read Only Memory), CD-ROM (Compact Disc Read-Only Memory), or other optical disc storage, optical disk storage (including compressed optical discs, laser discs, optical discs, digital universal optical discs, Blu-ray discs, etc.), magnetic disk storage media, or other magnetic storage devices, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures that can be accessed by a computer, but is not limited thereto. In this embodiment, the memory 40 is a W25Q128FV type FLASH memory, used to store parameter data such as voltage and temperature, fault data, and historical records during the charging process of the battery 200. It has the advantage of strong anti-interference and is suitable for the strong magnetic environment of the battery charging system.

[0047] Optionally, the battery charging system 100 further includes: a current detection unit 50 and an alarm unit 60; both the current detection unit 50 and the alarm unit 60 are communicatively connected to the control unit; the current detection unit 50 is used to detect the power supply current and charging current of the battery 200; the alarm unit 60 is used to output warning information.

[0048] Specifically, the current detection unit 50 includes a 4-20mA current acquisition unit for acquiring the power supply current of the battery 200; it also includes a 5-200AH current acquisition unit for acquiring the charging current of the battery 200, thereby enabling monitoring of the current of the battery 200.

[0049] The alarm unit 60 is an audible and visual alarm module. When the control unit 10 receives information transmitted by the voltage detection unit 20, the temperature detection unit 30 or the current detection unit 50 and determines that the battery 200 is in a fault state such as overcurrent, overvoltage, overheating or undervoltage, the control unit 10 will control the audible and visual alarm module to output warning information to remind the user to deal with it in time.

[0050] The control unit 10 includes a CSR8635 Bluetooth communication module, which is connected to the car's center console. When the control unit 10 determines that the battery 200 is in a faulty state, it can also remind the user to handle it in time through the car's center console, thus realizing human-machine interaction.

[0051] Optionally, the battery charging system 100 also includes an auxiliary power supply 70, which is electrically connected to the control unit 10 and is used to provide power to the control unit 10; a voltage detection unit 20 is connected to the auxiliary power supply 70 and is used to detect the voltage of the auxiliary power supply 70.

[0052] In this embodiment, the auxiliary power supply 70 includes a DK112-AC-DC converter, which provides a stable 12V power supply to the control unit 10, ensuring stable operating voltage for the control unit 10. The voltage detection unit 20 simultaneously monitors the voltage of the auxiliary power supply 70. When the voltage of the auxiliary power supply 70 falls below a preset threshold, the control unit 10 alerts the user via the vehicle's central control panel to take timely action.

[0053] Optionally, the battery charging system 100 also includes a main power switching unit 80, which is communicatively connected to the control unit 10;

[0054] The main power switching unit 80 is used to drive the power transistor circuit 300; the power transistor circuit 300 is electrically connected to the main power switching unit 80, the battery 200 and the power supply 400 respectively.

[0055] The main power switching unit 80 receives the instruction information from the control unit 10 and drives the power transistor circuit 300 to realize the charging mode of the power supply 400 for the battery 200, which includes positive and negative pulse charging and intermittent float charging.

[0056] In this embodiment, the main power switching unit 80 includes a UC3842 switching power supply unit, which is used to control the PWM (Pulse Width Modulation) signal and drive the power transistor circuit 300.

[0057] Figure 2 This is a schematic flowchart illustrating a battery charging control method provided in an embodiment of this application. (In conjunction with...) Figure 2 It can be seen that the method includes the following main steps:

[0058] S201, determine whether the battery is in a state of waiting to be charged based on the detected battery terminal voltage.

[0059] Optionally, the control unit 10 determines whether the battery 200 is in a state of waiting to be charged based on the terminal voltage of the battery 200 transmitted by the voltage detection unit 20.

[0060] S202, if the battery is in a standby state, then based on the detected battery temperature and the detected ambient temperature, determine the duty cycle of the positive pulse width modulation in the positive and negative pulse charging mode during battery charging, and determine the charging voltage in the intermittent float charging mode during battery charging.

[0061] Optionally, if the battery 200 is in a standby charging state, the control unit 10 determines the duty cycle of the positive pulse width modulation in the positive and negative pulse charging mode and the charging voltage in the intermittent float charging mode based on the temperature of the battery 200 transmitted by the temperature detection unit 30 and the ambient temperature.

[0062] The battery charging control method provided in this application determines whether the battery is in a state of needing to be charged based on the detected battery terminal voltage; and determines the duty cycle of the positive pulse width modulation in the positive and negative pulse charging mode and the charging voltage in the intermittent float charging mode based on the detected battery temperature and the detected ambient temperature. This battery charging control method employs both positive and negative pulse charging and intermittent float charging modes, solving the problem of a single charging mode in existing automotive battery charging methods and improving battery charging efficiency.

[0063] like Figure 3 The diagram shown is a flowchart illustrating an example of a battery charging control method provided in this application. This example provides a possible implementation of the battery charging control method of this application, including the following steps:

[0064] S301, the control unit determines whether the detected battery terminal voltage is less than or equal to the undervoltage threshold. If so, step S302 is executed; otherwise, the battery charging control process ends.

[0065] S302: Confirm that the battery is in a standby state.

[0066] It should be noted that the undervoltage threshold is preset and stored in the control unit 10 or memory 40. Since the standard voltage of lead-acid batteries used in general automobiles is mostly 12V, in this embodiment, the undervoltage threshold is set to 10V. That is, when the voltage detection unit 20 detects that the terminal voltage of the battery 200 is less than or equal to 10V, the control unit 10 determines that the battery 200 is in an undervoltage state and needs to control the power supply 400 to charge the battery 200.

[0067] S303, when the battery is in a standby state, the control unit determines the duty cycle of the positive pulse width modulation in the positive and negative pulse charging modes and the charging voltage in the intermittent float charging modes based on the detected battery temperature and the detected ambient temperature, and controls the power supply to charge the battery at the determined positive pulse width modulation duty cycle.

[0068] Specifically, when the battery 100 is in a standby charging state, the control unit 10 determines the duty cycle of the positive pulse width modulation in the positive and negative pulse charging modes and the charging voltage in the intermittent float charging mode based on the temperature of the battery 200 transmitted by the temperature detection unit 30 and the ambient temperature. In this embodiment, the duty cycle of the positive pulse width modulation is 85%-90%. Simultaneously, the control unit 10 determines the charging voltage in the positive and negative pulse charging modes based on the determined duty cycle of the positive pulse width modulation. The main power switching unit 80 receives the instruction information from the control unit 10 and drives the power transistor circuit 300 to enable the power supply 400 to charge the battery 200 using the charging voltage in the positive and negative pulse charging modes.

[0069] It should be noted that in this embodiment of the application, the battery 200 can be quickly charged by the positive and negative pulse charging mode. The intermittent negative pulses can prevent the battery 200 from losing water during the charging process.

[0070] During the charging process of the battery 200, the control unit 10 performs real-time temperature compensation on the charging voltage of the positive and negative pulse charging mode according to the ambient temperature. Specifically, with 25°C as the reference temperature, the charging voltage of the positive and negative pulse charging mode will decrease by 3mV for every 1°C increase in ambient temperature above the reference temperature, and conversely, the charging voltage of the positive and negative pulse charging mode will increase by 3mV for every 1°C decrease in ambient temperature below the reference temperature.

[0071] S304: When the charging voltage in the positive and negative pulse charging mode exceeds the preset threshold, the positive and negative pulse charging mode is stopped, and the power supply is controlled to charge the battery with the charging voltage in the intermittent float charging mode.

[0072] Specifically, in this embodiment, the preset threshold for the charging voltage in the positive and negative pulse charging mode is 11V. When the charging voltage in the positive and negative pulse charging mode exceeds 11V, the control unit 10 controls the main power switching unit 80 to drive the power transistor circuit 300, which in turn controls the power supply 400 to end the positive and negative pulse charging mode and charges the battery 200 with the charging voltage in the intermittent float charging mode. In this embodiment, the charging voltage in the intermittent float charging mode is controlled between 11.5V and 12V.

[0073] During the charging process of battery 200, control unit 10 performs real-time temperature compensation on the charging voltage of intermittent float charging mode based on ambient temperature. Specifically, with 25°C as the reference temperature, the charging voltage of intermittent float charging mode decreases by 3mV for every 1°C increase in ambient temperature above the reference temperature, and conversely, the charging voltage of intermittent float charging mode increases by 3mV for every 1°C decrease in ambient temperature below the reference temperature.

[0074] During the charging process of the battery 200, the control unit 10 stores information such as charging time, charging voltage, charging current, and battery 200 temperature for each charging mode in the memory 40. Simultaneously, when the control unit 10 receives information from the voltage detection unit 20, temperature detection unit 30, or current detection unit 50 and determines that the battery 200 is in a fault state such as overcurrent, overvoltage, overheating, or undervoltage, the control unit 10 controls the audible and visual alarm module to output warning information to remind the user to handle the situation promptly and stores the fault information in the memory 40.

[0075] Based on the same inventive concept, this application provides an electric vehicle, including: a storage battery 200, a power supply 400, a power transistor circuit 300, and a storage battery charging system 100 provided in the above embodiments of this application;

[0076] The battery charging system 100 is connected to the battery 200 and the power transistor circuit 300 respectively. The battery 200 is connected to the power supply 400 through the power transistor circuit 300.

[0077] By applying the embodiments of this application, at least the following beneficial effects can be achieved:

[0078] 1. The battery charging control method provided in this application determines whether the battery is in a state of waiting to be charged based on the detected battery terminal voltage; and determines the duty cycle of the positive pulse width modulation in the positive and negative pulse charging mode and the charging voltage in the intermittent float charging mode based on the detected battery temperature and the detected ambient temperature. The battery charging control method in this application adopts both positive and negative pulse and intermittent float charging modes, solving the problem of a single charging mode in existing automotive battery charging methods and improving battery charging efficiency.

[0079] 2. The battery charging system provided in this application includes: a control unit, a voltage detection unit, a temperature detection unit, and a memory. The voltage detection unit, temperature detection unit, and memory are all communicatively connected to the control unit. The control unit can control the power supply to charge the battery using positive and negative pulse charging and intermittent float charging modes according to the battery's state. Simultaneously, the voltage detection unit and temperature detection unit monitor the battery's charging data in real time, automatically identifying charging faults based on abnormal data, thus achieving intelligent charging management of the battery and improving the charging efficiency of lead-acid batteries.

[0080] Those skilled in the art will understand that the steps, measures, and solutions in the various operations, methods, and processes discussed in this application can be alternated, modified, combined, or deleted. Furthermore, other steps, measures, and solutions in the various operations, methods, and processes discussed in this application can also be alternated, modified, rearranged, decomposed, combined, or deleted. Furthermore, steps, measures, and solutions in the prior art that are similar to those disclosed in this application can also be alternated, modified, rearranged, decomposed, combined, or deleted.

[0081] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "multiple" means two or more.

[0082] It should be understood that although the steps in the flowcharts of the accompanying figures are shown sequentially as indicated by the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the accompanying figures may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the sub-steps or stages of other steps.

[0083] The above description is only a partial embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A battery charging control method, characterized in that, Includes the following steps: Based on the detected terminal voltage of the battery, determine whether the battery is in a state of needing to be charged; If the battery is in a state of waiting to be charged, the duty cycle of the positive pulse width modulation in the positive and negative pulse charging mode during the charging of the battery is determined based on the detected temperature of the battery and the detected ambient temperature, and the charging voltage in the intermittent float charging mode during the charging of the battery is determined. When the duty cycle of the positive pulse width modulation in the positive and negative pulse charging mode is determined during battery charging, the charging voltage in the positive and negative pulse charging mode is determined according to the duty cycle of the positive pulse width modulation, and the power supply is controlled to charge the battery with the charging voltage in the positive and negative pulse charging mode. During the charging process of the battery, the charging voltage of the positive and negative pulse charging modes is compensated for in real time according to the ambient temperature. When the charging voltage in the positive and negative pulse charging mode exceeds a preset threshold, the positive and negative pulse charging mode is stopped, and the power supply is controlled to charge the battery with the charging voltage in the intermittent float charging mode; during the battery charging process, the charging voltage of the intermittent float charging mode is compensated for in real time according to the ambient temperature.

2. The battery charging control method according to claim 1, characterized in that, Determining whether the battery is in a state of needing to be charged includes: The battery is determined to be in a state of waiting to be charged if the detected terminal voltage is compared with a preset undervoltage threshold and the terminal voltage is less than or equal to the undervoltage threshold.

3. The battery charging control method according to claim 1, characterized in that, The duty cycle of the positive pulse width modulation is 85%-90%.

4. A battery charging system, characterized in that, include: Control unit, voltage detection unit, temperature detection unit, current detection unit, alarm unit, and memory; The control unit includes a Bluetooth communication module, which is connected to the car's center console. When the control unit determines that the battery is in a faulty state, the car's center console reminds the user to handle it in time. The voltage detection unit, the temperature detection unit, and the memory are all communicatively connected to the control unit. The voltage detection unit is used to detect the power supply voltage and charging voltage of the battery. The temperature detection unit is used to detect the temperature of the battery when it is charging and the ambient temperature. Both the current detection unit and the alarm unit are communicatively connected to the control unit and are used to detect the power supply current and charging current of the battery. The alarm unit is used to output warning information; During the charging process of the battery, the control unit stores the charging time, charging voltage, charging current, and battery temperature information of each charging mode in the memory. When the control unit receives information from the voltage detection unit, temperature detection unit, or current detection unit and determines that the battery is in a fault state including overcurrent, overvoltage, overheating, or undervoltage, the control unit controls the sound and light alarm module to output sound and light alarm warning information to remind the user to deal with it in time and stores the fault information in the memory. The memory stores at least one program configured to be executed by the control unit to implement the battery charging control method as described in any one of claims 1-3.

5. The battery charging system according to claim 4, characterized in that, It also includes an auxiliary power supply, which is electrically connected to the control unit and is used to provide power to the control unit; The voltage detection unit is connected to the auxiliary power supply and is used to detect the voltage of the auxiliary power supply.

6. The battery charging system according to claim 5, characterized in that, It also includes a main power switch unit, which is communicatively connected to the control unit; The main power switching unit is used to drive the power transistor circuit; the power transistor circuit is electrically connected to the main power switching unit, the battery, and the power supply respectively. The main power switch unit receives the instruction information from the control unit and drives the power transistor circuit to realize the charging mode of the power supply for the battery, which includes positive and negative pulse charging and intermittent float charging.

7. An electric vehicle, characterized in that, include: A storage battery, a power supply, a power transistor circuit, and a storage battery charging system as described in any one of claims 4-6; The battery charging system is connected to the battery and the power transistor circuit respectively, and the battery is connected to the power supply through the power transistor circuit.

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