An electric vehicle charging management circuit

Abstract

The utility model discloses an electric motor car charging management circuit communicates with charger module, is used for adjusting battery charging strategy with charger module, including singlechip U1, temperature sampling circuit, heating control circuit, charging current sampling circuit, communication circuit, singlechip U1 is controller respectively with temperature sampling circuit, heating control circuit, charging current sampling circuit electricity and is connected, heating control circuit is used for with electric heating piece series connection, and singlechip U1 is according to the battery operating temperature of temperature sampling circuit collection, controls the on-off of heating control circuit, charging current sampling circuit is used for gathering the charging current numerical value of battery, and singlechip U1 is connected charger module by communication circuit, is used for transmission charging current numerical value adjustment battery charging strategy. The utility model has solved the problem that battery overheating is easy to occur in the heating process of lead -acid battery.

Description

Technical Field

[0001] This application relates to a charging management circuit, and more particularly to a charging management circuit for electric vehicles. Background Technology

[0002] Users of ordinary household electric two-wheelers often complain about problems such as short driving range and battery life when using or charging in low-temperature environments. The main reason is that the activity of lead-acid batteries decreases in low-temperature environments, leading to a reduction in charge and discharge capacity.

[0003] To address these issues, manufacturers typically heat the batteries to bring them to a suitable operating temperature during charging, thereby increasing battery capacity. However, existing lead-acid batteries in electric two-wheelers are prone to overheating during the heating process, posing a safety hazard. Utility Model Content

[0004] This utility model discloses an electric vehicle charging management circuit, which solves the problem of battery overheating during the heating process of lead-acid batteries.

[0005] An electric vehicle charging management circuit, which communicates with a charger module to coordinate with the charger module in adjusting the battery charging strategy, includes a microcontroller U1, a temperature sampling circuit, a heating control circuit, a charging current sampling circuit, and a communication circuit.

[0006] The microcontroller U1, acting as a controller, is electrically connected to the temperature sampling circuit, the heating control circuit, and the charging current sampling circuit.

[0007] The heating control circuit is connected in series with the electric heating element. The microcontroller U1 controls the on / off state of the heating control circuit based on the battery operating temperature collected by the temperature sampling circuit.

[0008] The charging current sampling circuit is used to collect the charging current value of the battery. The microcontroller U1 is connected to the charger module by the communication circuit and is used to transmit the charging current value to adjust the battery charging strategy.

[0009] In this application, a heating control circuit is set to control the current on and off of the electric heating element, thereby avoiding safety hazards caused by battery overheating. A temperature sampling circuit is used to monitor the battery temperature to prevent overheating. In addition, a charging current sampling circuit is set to collect the magnitude of the battery charging current to avoid risks caused by overcurrent.

[0010] Several alternative methods are provided below, but they are not intended as additional limitations on the overall solution above. They are merely further additions or optimizations. Provided there are no technical or logical contradictions, each alternative method can be combined individually with respect to the overall solution above, or multiple alternative methods can be combined with each other.

[0011] Optionally, it also includes a 5-volt power supply circuit that converts the input voltage into the operating voltage to provide operating power for the microcontroller U1.

[0012] Optionally, a voltage sampling circuit is also included to collect battery charging voltage values.

[0013] Optionally, a heating current sampling circuit is also included. The heating current sampling circuit is connected to the electric heating element and is used to obtain the heating current value and input the obtained heating current value to the microcontroller U1.

[0014] Optionally, a runaway protection circuit is also included, which is connected in series with the electric heating element and disconnects the current on the electric heating element when the heating current exceeds the rated value.

[0015] Optionally, the runaway protection circuit includes a three-terminal fuse F1 and transistors Q3, Q2, and Q1, which work in conjunction with the microcontroller U1 to control the three-terminal fuse F1 to blow and cut off the power to the heating element.

[0016] Optionally, the communication circuit adopts a bidirectional one-wire communication circuit.

[0017] The beneficial effects of this application are as follows:

[0018] 1. This application includes a temperature sampling circuit and a heating control circuit to sample the temperature value of the battery during heating and to disconnect the circuit in time when it overheats to avoid the risk of overheating;

[0019] 2. Set up charging current sampling circuit and voltage sampling circuit to collect battery charging current and battery charging voltage values, monitor battery overcharge and overcurrent, and transmit the data to the charger module in conjunction with the communication circuit to disconnect the battery charging current in a timely manner.

[0020] 3. The heating current sampling circuit, in conjunction with the runaway protection circuit, is used for runaway protection when the electric heating element experiences overcurrent.

[0021] 4. This application simultaneously collects battery charging current, battery charging voltage, battery temperature, and heating current values, and transmits them to the charger module via a communication circuit. This allows the charger module to adjust its charging strategy and promptly regulate the power output to the battery or the heating element. Attached Figure Description

[0022] Figure 1aThis is a block diagram of an embodiment of this application;

[0023] Figure 1b This is a block diagram of another embodiment of this application;

[0024] Figure 2 This is a schematic diagram of a charger module in one embodiment of this application;

[0025] Figure 3 This is a schematic diagram of a battery module in one embodiment of this application;

[0026] Figure 4 This is a schematic diagram of a charging management circuit in one embodiment of this application;

[0027] Figure 5 This is a block diagram of an embodiment of this application;

[0028] Figure 6 This is a voltage / current diagram of the charging circuit in one embodiment of this application;

[0029] Figure 7 This is a current diagram of the heating circuit in one embodiment of this application;

[0030] Figure 8 This is a general circuit diagram of one embodiment of this application;

[0031] Figure 9 This is a circuit diagram of a 5-volt power supply circuit in one embodiment of this application;

[0032] Figure 10 This is a circuit diagram of a temperature sampling circuit in one embodiment of this application;

[0033] Figure 11 This is a circuit diagram of a battery voltage sampling circuit in one embodiment of this application;

[0034] Figure 12 This is a circuit diagram of the charging current sampling circuit and the heating current sampling circuit in one embodiment of this application;

[0035] Figure 13 This is a circuit diagram of a heating control circuit in one embodiment of this application;

[0036] Figure 14 This is a circuit diagram of a bidirectional charger with a single-line circuit and a microcontroller in one embodiment of this application. Detailed Implementation

[0037] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0038] It should be noted that when a component is said to be "connected" to another component, it can be directly connected to the other component or it can be connected to a component in between. When a component is said to be "set on" another component, it can be directly set on the other component or it may be set to a component in between.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0040] Example 1

[0041] One embodiment of this application discloses a charging control method for electric two-wheeled vehicles based on lead-acid batteries, which is applied to a battery pack module with electric heating function.

[0042] The aforementioned battery module with electric heating function is pluggably connected to the charger module, thereby forming a charging circuit for charging the lead-acid battery pack and a heating circuit for powering the electric heating element.

[0043] The above-mentioned charging control method includes: when the battery pack module is charging, collecting the charging current value and charging voltage value of the charging circuit where the lead-acid battery pack is located; the heating current value of the heating circuit where the electric heating element is located; and the battery temperature value of the battery pack module as a whole.

[0044] Based on the above values, when the charger module is working, it allocates or controls its total output power for battery heating and battery charging, that is, it adjusts the current in the heating circuit and the charging circuit.

[0045] This aims to increase battery capacity and reduce charging time in high-voltage areas under cold conditions, thereby avoiding problems such as insufficient battery life and battery water loss.

[0046] As an explanation, conventional charger modules on the market currently have a built-in microcontroller to implement three charging modes (constant current, constant voltage, and float charging). This microcontroller is used to program the charging strategy and acts as a controller to switch from constant current to constant voltage to float charging.

[0047] In the control method adopted in this application, the control method is also programmed into the microcontroller of the charger module. After the battery pack module is connected to the charger module, the charging strategy is changed according to the data collected above.

[0048] refer to Figure 6 and Figure 7 The above-mentioned charging control method specifically includes dividing the charging of the battery pack module into the following stages:

[0049] Phase 1: Constant Current Charging

[0050] During this stage, the full power of the charger module is allocated to the charging circuit to charge the lead-acid battery pack at the maximum rated current for fast charging of the lead-acid battery pack.

[0051] refer to Figure 6 In Phase 1, in response to the current voltage value on the lead-acid battery pack, when the battery voltage value is less than the charging limit voltage V2 (the battery is in a low remaining capacity state), the charger module adopts a constant current charging mode with a current I1. a This is used as the charging current.

[0052] The maximum rated current I1 a This refers to the charger's maximum output current.

[0053] Phase Two: Voltage-Limited Charging

[0054] During this stage, the charging voltage of the lead-acid battery pack is limited to maintain a constant voltage value, and the current in the charging circuit gradually decreases. Simultaneously, the reduced current is redistributed by the charger module to the heating circuit for heating the lead-acid battery pack, bringing the battery to a suitable charging temperature, which helps improve battery capacity at low temperatures.

[0055] refer to Figure 6 Phase Two: In response to the charging voltage value (charging voltage, i.e., the battery voltage in the charging circuit), when the charging voltage value reaches the charging limit voltage V2, the charging voltage supplied by the charger module to the battery is limited, maintaining the current voltage value at the charging limit voltage V2. At this time, the charging current value gradually decreases, such as current I2. a Conversely, the heating current value shows a gradual increasing trend, such as Figure 7 Medium current I2 b .

[0056] Furthermore, the current I2 a With current I2 b The sum equals the maximum rated current I1 a .

[0057] Phase 3: Current-limited charging

[0058] During this stage, while heating the lead-acid battery pack, a small current is maintained to charge it until the battery pack is nearly fully charged. Using a small current for charging offers the advantage of high controllability and avoids overcharging.

[0059] refer to Figure 6 In response to the charging current value, when the charging current value decreases to current I3 a When (charging current is limited), it will remain at current I3. a Charge the battery. Simultaneously, control and maintain the current I3. b Used for battery heating. This stage uses a small current to charge the battery until the battery voltage is close to the full charge voltage, reducing damage to the battery electrodes and electrolyte decomposition, which helps extend the battery's cycle life. Furthermore, using a small current for charging offers the advantage of high controllability and avoids overcharging.

[0060] Phase 4: Constant Voltage Charging

[0061] During this stage, the lead-acid battery pack is charged at its maximum limiting voltage to bring it to its maximum voltage value and prevent overcharging.

[0062] refer to Figure 6 Phase four: Maintain the charging voltage at V4.

[0063] In one embodiment of this application, the battery charging stage further includes:

[0064] Phase 5: Trickle Charging

[0065] In this stage, the issue of virtual battery charge is addressed. After a preset charging time t3 in stage four, the battery is considered fully charged. Then, the battery is charged with a small current for a preset charging time T4. After the preset charging time T4 is reached, the charger stops working.

[0066] Phase Six: Battery Preheating

[0067] During this stage, in response to the battery temperature value and the control signal from the cloud server, the system receives the control signal from the cloud server via the 4G module and controls the power supply to supply power to the charging circuit and the heating circuit before the predicted usage time is reached.

[0068] Phase six above is applied to travel in cold weather. Preheating the battery before travel improves battery life. It predicts usage time by analyzing user operation logs to understand weekday battery usage and departure times, allowing for preheating of the battery in advance.

[0069] Users should ensure the battery is at a suitable operating temperature before setting off to extend the driving range.

[0070] The table below shows the charging voltage / current values ​​of lead-acid batteries charged using the above-described charging control method.

[0071]

[0072] Note: The charging voltage in the table refers to the voltage of a single battery cell. For example, if a 72V battery is in the first stage of constant current charging, the charging voltage is 13.8V × 6 = 82.8V.

[0073] To facilitate understanding, the above charging control method will be further explained (refer to the table above, ...). Figure 6 , Figure 7 ).

[0074] in, Figure 6 Voltage / current diagram of the charging circuit when charging the battery. Figure 7 Current diagram of the heating circuit when charging the battery.

[0075] In traditional battery charging, the battery quickly reaches a high voltage through constant current charging, and then maintains this high voltage for constant voltage charging. Prolonged high-voltage charging can cause lead-acid batteries to lose water, leading to a reduction in battery life.

[0076] The differences between stages one through four above and traditional battery charging modes (constant current to constant voltage) are as follows:

[0077] Traditional battery charging mode: The battery voltage is charged to 90% of the battery capacity using constant current charging, and then the battery is charged to 100% of the battery capacity using constant voltage charging with the battery's maximum limit voltage.

[0078] In this application, firstly, in the first stage, constant current charging is used to charge the battery to the charging limit current V2 (the value of the charging limit current V2 is selected in the range of 80%-95% of the value of the highest charging limit voltage V4, usually 85% of the value of the highest charging limit voltage V4 is selected, which can also be understood as 85% of the battery capacity).

[0079] Then, in stage two, the voltage is limited to the charging limit current V2, and a portion of the current in the charging circuit is allocated to the heating circuit to regulate the battery temperature and improve the battery capacity.

[0080] Phase 3, using a small current (charging limit current I3) a This gradually charges the battery to near its maximum limiting voltage, V4. This reduces the time the battery spends charging in the high-voltage zone, decreases water loss, and extends battery life.

[0081] Finally, in stage four, the lead-acid battery pack is charged at the maximum limiting voltage V4 to bring it to its maximum voltage value and prevent overcharging.

[0082] To address the issue of water loss in lead-acid batteries caused by prolonged high-voltage charging (referring to charging the battery at its maximum limiting voltage), thus extending battery life, this application improves upon the following: In stage two, the charging current is allocated to the heating circuit to increase battery capacity in cold environments; in stage three, a small-current constant-current charging method is used to bring the battery close to full charge. This smaller current is more controllable, preventing overcharging and reducing the charging time at the battery's maximum limiting voltage.

[0083] Example 2

[0084] refer to Figure 1a and Figure 1b This application discloses a charging management system for electric two-wheeled vehicles based on lead-acid batteries, used to implement the charging control method in Embodiment 1 above. The charging management system includes a charger module, a charging management circuit, and a battery module.

[0085] The charging management system includes a charging circuit and a heating circuit. The charger module outputs current to the charging circuit and the heating circuit. The charging management circuit works with the charger module to control the magnitude and on / off state of the current in the charging circuit and the heating circuit. The battery module includes a lead-acid battery pack connected to the charging circuit and an electric heating element connected to the heating circuit.

[0086] It should be noted that the above-mentioned charging management circuit can be integrated into the charger module, integrated into the battery module, or set up as a separate charging management module on the electric two-wheeler.

[0087] Furthermore, during operation, the charger module can acquire its own output power (including current and voltage) in real time; the charging management module can measure the temperature inside the battery module to obtain the battery temperature value, as well as the battery operating values ​​on the charging circuit (including real-time charging current and charging voltage values).

[0088] By comparing the battery operating values ​​and battery temperature values ​​with the corresponding preset reference values, the charging management module allocates power to the battery module in the charging circuit and heating circuit, provided that the preset conditions are met.

[0089] The charger module connects to an external power source and outputs DC power to the lead-acid battery pack and the heating element, forming a charging circuit and a heating circuit respectively.

[0090] The charging management circuit includes a first control chip and a heating control circuit. The first control chip is connected to the heating control circuit to control the current flow in the heating circuit.

[0091] The charger module is communicatively connected to and cooperates with the charging management circuit to execute the charging control method in Example 1 based on the above-mentioned charging current and charging voltage values.

[0092] For details, please refer to Figure 4 and Figure 5 In one embodiment of this application, the charging management circuit is modularized to form an independent charging management module.

[0093] The charging management module also includes a heating current detection circuit connected to the heating circuit, a voltage sampling circuit and a charging current sampling circuit connected to the charging circuit, and a battery temperature detection circuit.

[0094] The heating current detection circuit is used to detect the current on the heating element and works with the heating control circuit to protect the heating element from short circuits and overcurrent.

[0095] A voltage sampling circuit is used to obtain the charging voltage value.

[0096] The charging current sampling circuit is used to obtain the above charging current value to prevent overcharging and undercharging, and to dynamically adjust the charging strategy based on the battery charging data fed back by the charging current sampling circuit.

[0097] The battery temperature detection circuit is partially located inside the battery module. It monitors the temperature inside the battery module in real time through a temperature sensor, obtains the battery temperature value, and feeds it back to the first control chip. This serves as the basis for the heating control circuit to control the on / off state or magnitude of the current on the heating element, and is used to adjust the current distribution strategy of the charging circuit and the heating circuit.

[0098] Furthermore, the charging management module also includes a runaway protection circuit, which achieves runaway protection by blowing a fuse. The runaway protection circuit is located on the heating circuit.

[0099] In some embodiments, the heating control circuit may use a MOSFET to control the magnitude and on / off state of the current in the heating circuit, and receive the battery temperature value, charging voltage value, and charging current value through the first control chip for dynamic adjustment.

[0100] The first control chip can be an N32L43x series microcontroller.

[0101] refer to Figure 2 and Figure 5 In some embodiments, the charger module includes a transformer and rectifier circuit for converting external power into rated DC power for output, as well as a charger current detection circuit and a charging switch control circuit.

[0102] The transformer converts the input voltage from the external power supply into the charging voltage required by the battery by adjusting the turns ratio of the primary and secondary coils. The rectifier circuit converts pulsating current into smooth current, reducing fluctuations and obtaining a stable DC voltage. Simultaneously, it blocks reverse current, preventing damage to other components of the charger from reverse connection of the digital battery or reverse electromotive force from the load.

[0103] The charging switch control circuit is used to control the conduction and disconnection of the current in the charger module, so as to realize the synchronous and rapid switching of the charging circuit and the heating circuit. This can reduce the energy consumption during conduction and improve the charging efficiency. When combined with the monitoring circuit (such as the charger current detection circuit mentioned above), it can realize power-off protection in case of short circuit, overcurrent and overheating.

[0104] Further reference Figure 1a A communication circuit is provided between the charger module and the charging management module, which can be used to transmit control signals from the charging management module and information on the current output power of the charger module.

[0105] The aforementioned communication circuit can be one of the following: bidirectional one-wire communication circuit, CAN communication, or 485 communication.

[0106] Furthermore, due to the pin count limitation of the external wiring harness connector on the charger module, and to avoid designing a dedicated connector from scratch, a bidirectional one-wire communication circuit is used as the communication circuit. This reduces the number of wiring harnesses and makes it easier to adapt to the pin count of the external wiring harness connector on the charger module.

[0107] In this application, the charger module is equipped with a second control chip, which is model CM9M13X.

[0108] Furthermore, the second control chip is used to program the charging control method in Embodiment 1 as an improved charging method, and also programs the existing constant current to constant voltage charging method as the default charging method.

[0109] The second control chip is connected to the first control chip via a bidirectional one-wire communication circuit. After the charger module is connected to the battery module, the second control chip and the first control chip transmit handshake signals through the bidirectional one-wire communication circuit for identification. Successful identification between the second control chip and the first control chip serves as a prerequisite for executing the charging control method in the first embodiment.

[0110] Furthermore, the aforementioned current values, charging voltage values, and battery temperature values ​​are transmitted via a two-way one-wire communication circuit as the basis for executing a certain stage of the charging control method in Embodiment 1.

[0111] If the handshake signal recognition fails or the above parameters fail to be recognized, charging will proceed using the default charging method.

[0112] refer to Figure 1b In one embodiment of this application, the charging management circuit can be integrated into the charger module, which can improve the adaptability of this charging management system and connect it to more two-wheeled electric vehicles with battery heating function to form the charging management system in this application.

[0113] Furthermore, when the charging management circuit is integrated into the charger module, the charger module may not need to have a second control chip. Instead, the charging control method described in Embodiment 1 above can be directly programmed into the first control chip as an improved charging method, and an existing constant current to constant voltage charging method can be programmed as the default charging method.

[0114] Furthermore, the current on the MOSFET is controlled by the first control chip to distribute the current between the heating circuit and the charging circuit.

[0115] refer to Figure 1a The aforementioned charging management system also includes a 4G communication module for connecting to the Internet, uploading user usage data to a cloud server, and then organizing and classifying the user usage data. Through clustering algorithms and time series prediction models, it anticipates future demand and remotely controls the charging management system.

[0116] The aforementioned user data includes sensor data and operation logs. The methods of collecting user data include data acquisition through sensors installed on the electric bicycle and uploading battery usage information.

[0117] The sensor data includes records of daily usage times, geographical location and mileage trajectory, and ambient temperature, obtained through built-in sensors (timestamp, GPS, temperature sensor). The operation logs include historical behavioral data such as user charging and discharging frequency and battery load changes.

[0118] Then, through sorting and categorizing, the cycle is divided according to natural days to identify high-frequency and low-frequency usage periods (such as weekday morning and evening commuting periods); typical scenarios are marked (such as marking based on historical travel: user's home address and company address), and a behavior classification library is established for charging planning to improve the level of intelligence; key indicators of daily use are quantified: usage period, frequency, time, fixed mileage, and distance.

[0119] User usage data uploaded to the cloud server based on the 4G communication module can be used for intelligent charging planning (e.g., adjusting heating strategies according to different ambient temperatures; preheating the battery by energizing the heating circuit according to the user's commuting distance and time period), and for charging reminders, etc.

[0120] Specifically, regarding the method for collecting user data, please refer to the patent publication text of the applicant's earlier application with publication number "CN202510333859.2" entitled "A Data Acquisition Method Device Electronic Equipment and Storage Medium".

[0121] It should be noted that the charger module, battery module, and charging management module mentioned above can be independent of each other, or the circuits contained in the charging management module can be merged into one or both of the charger module and charging management module, thus changing the external form.

[0122] Example 3

[0123] To implement the charging management system and charging control method in Embodiments 1 and 2 above, this application also discloses a circuit for the above-mentioned charging management system.

[0124] refer to Figure 8 The circuit disclosed includes a battery voltage sampling circuit, a 5-volt power supply circuit, a temperature sampling circuit, a charging current sampling circuit, a heating current sampling circuit, a runaway protection circuit, a heating control circuit, a bidirectional charger one-line circuit, and a microcontroller U1 (i.e., the first control chip in the above embodiment).

[0125] like Figure 11 As shown, the battery voltage sampling circuit includes resistors R27, R31, and R28 for voltage division. By measuring the voltage across resistor R28, the voltage is transmitted to pin 22 of the microcontroller U1 to obtain the aforementioned charging voltage value.

[0126] like Figure 9 As shown, the 5V power supply circuit includes a switching power supply chip U10 for controlling the control current output, capacitor C3 for filtering the current entering the switching power supply chip U10 from VCC1, and an LC filter network consisting of capacitor L2 and inductor C15 is set at the output terminal (VCC2) of the switching power supply chip U10 to output a stable 5V power supply.

[0127] like Figure 10 As shown, the temperature sampling circuit includes an RTC thermistor, a voltage divider resistor R17, and a filter capacitor C6, which transmit the data to pin 17 of the microcontroller U1 to obtain the battery temperature value.

[0128] like Figure 12 As shown, the constant current source chip U4 provides a 3.6V input, which serves as the reference voltage for current amplifiers U2 and U3;

[0129] The charging current sampling circuit includes a current amplifier U2, and current sensing resistors R39, R37, and R38 are connected in series at the negative terminal of the battery for current sampling. The current amplifier U2 amplifies the differential signal and transmits it to pin 15 of the microcontroller U1 to obtain the charging current value.

[0130] The heating current sampling circuit (same as the heating current detection circuit in Embodiment 1) includes a current amplifier U3, which is connected to the heating circuit and transmits the data to pin 14 of the microcontroller U1 to obtain the heating circuit current value.

[0131] refer to Figure 13 In the heating control circuit, when the microcontroller U1 determines that the battery needs to be heated, pin 18 of the microcontroller U1 controls the MOSFET Q5 to conduct, thus powering on the heating circuit.

[0132] The runaway protection circuit uses the output signal of the microcontroller U1 to control the conduction of transistor Q3, and the sequential conduction or deactivation of transistors Q2 and Q1, which, together with the three-terminal fuse F1, realizes the runaway protection of the heating circuit.

[0133] like Figure 14 As shown, the bidirectional charger has a single-wire circuit.

[0134] It should be noted that, for the sake of brevity, the naming of some circuits in this embodiment differs from that of the circuits in each module of Embodiment 1. The functions of each circuit in this embodiment can be compared with the functions of the circuits in each module of Embodiment 1.

[0135] The technical features of the embodiments described above can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered to be within the scope of this specification. When technical features of different embodiments are embodied in the same drawing, it can be regarded as the drawing also disclosing examples of combinations of the various embodiments involved.

[0136] The embodiments described above are merely examples of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application.

Claims

1. An electric vehicle charging management circuit, communicating with a charger module, for cooperating with the charger module to adjust the battery charging strategy, characterized in that, Includes microcontroller U1, temperature sampling circuit, heating control circuit, charging current sampling circuit, and communication circuit. The microcontroller U1, acting as a controller, is electrically connected to the temperature sampling circuit, the heating control circuit, and the charging current sampling circuit. The heating control circuit is connected in series with the electric heating element. The microcontroller U1 controls the on / off state of the heating control circuit based on the battery operating temperature collected by the temperature sampling circuit. The charging current sampling circuit is used to collect the charging current value of the battery. The microcontroller U1 is connected to the charger module by the communication circuit and is used to transmit the charging current value to adjust the battery charging strategy.

2. The electric vehicle charging management circuit according to claim 1, characterized in that, It also includes a 5-volt power supply circuit that converts the input voltage into the operating voltage to provide operating power for the microcontroller U1.

3. The electric vehicle charging management circuit according to claim 2, characterized in that, It also includes a voltage sampling circuit for collecting battery charging voltage values.

4. The electric vehicle charging management circuit according to claim 3, characterized in that, It also includes a heating current sampling circuit, which is connected to the electric heating element to obtain the heating current value and input the obtained heating current value to the microcontroller U1.

5. The electric vehicle charging management circuit according to claim 4, characterized in that, It also includes a runaway protection circuit, which is connected in series with the electric heating element and disconnects the current to the electric heating element when the heating current exceeds the rated value.

6. The electric vehicle charging management circuit according to claim 5, characterized in that, The runaway protection circuit includes a three-terminal fuse F1 and transistors Q3, Q2, and Q1, which work in conjunction with the microcontroller U1 to control the three-terminal fuse F1 to blow and cut off the power to the heating element.

7. The electric vehicle charging management circuit according to claim 6, characterized in that, The communication circuit adopts a bidirectional one-wire communication circuit.

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