A system and method for charging an automotive battery

Abstract

The present invention provides a system and method for charging an automotive battery. The system includes: a battery, a vehicle controller, a power supply circuit, and a charging device, and the charging device includes an auxiliary power supply. The method is as follows: electrically connect the charging device to the vehicle controller, the auxiliary power supply of the charging device starts to output power to the vehicle controller, and at the same time, it outputs to the battery through the power supply circuit. The vehicle controller determines whether the charging trigger condition is met. When the charging trigger condition is established, the charging process of the battery is entered. After the charging process ends, the vehicle controller notifies the charging device to stop the output of the auxiliary power supply and stop charging the battery. The present invention solves the problem of the vehicle battery being discharged, eliminates the need for external jump-starting, and has no risk of short circuit and reverse connection.

Description

Technical Field

[0001] The present invention relates to the technical field of automobiles, and particularly to a system and method for charging an automobile battery. Background Art

[0002] The battery of a new energy vehicle needs to supply power to the vehicle control system when the vehicle is parked. If the user leaves the vehicle unused for a long time, the battery will discharge, and the entire vehicle control system will not work, making the vehicle unusable. Currently, there is no charging device that can charge the vehicle battery. The existing technical solution is to lead out the battery jumper wire and use the jumper wire and the jump-starting device to complete the jump-starting, and solve the problem of battery discharge through external jump-starting. The existing technical solutions have many conditions to meet the jump-starting requirements and are not convenient to operate. When jump-starting the battery, there is a risk of short-circuiting and reverse connection, which is likely to burn out the circuit or vehicle equipment. Summary of the Invention

[0003] In view of the above disadvantages of the prior art, the purpose of the present invention is to provide a system and method for charging an automobile battery, which is used to solve the problem that there is no charging device in the prior art that can charge the vehicle battery.

[0004] To achieve the above object and other related objects, the present invention provides a system and method for charging an automobile battery, and proposes a method for an automobile to charge the battery using a DC charging pile to solve the problem of battery discharge of the vehicle. When the battery is discharged, by inserting the charging gun connected to the DC charging pile, the battery of the vehicle is charged by using DC charging. The DC charging gun and the charging socket of the vehicle belong to standard interfaces, and there is no risk of short-circuiting and reverse connection during jump-starting. Only by inserting the DC charging gun for DC charging can the battery be charged, without the need for external equipment, and the conditions are easy to meet.

[0005] In an embodiment of the present invention, a system for charging an automobile battery, the system is electrically connected to a charging device, and the system includes:

[0006] A battery;

[0007] A vehicle controller, the vehicle controller is electrically connected to the battery; and

[0008] A power supply circuit, the input end of the power supply circuit is electrically connected to the charging device and the vehicle controller respectively, and the output end is electrically connected to the battery.

[0009] In an embodiment of the present invention, the charging device includes a charging pile, a charging gun and a charging socket;

[0010] The charging pile has an auxiliary power supply. When the charging pile receives an emergency charging instruction sent by the vehicle controller, it maintains the output of the auxiliary power supply. When the emergency charging instruction is revoked, it stops the output of the auxiliary power supply.

[0011] The charging pile is connected to the charging socket through the charging gun. The charging socket includes an auxiliary power supply interface corresponding to the charging pile. The auxiliary power supply interface includes an auxiliary power supply positive electrode and an auxiliary power supply negative electrode. The charging socket is correspondingly connected to the charging pile through the charging gun.

[0012] The vehicle controller includes a first power supply positive electrode interface and a second power supply positive electrode interface. The first power supply positive electrode interface is connected to the positive electrode of the storage battery, and the second power supply positive electrode interface is connected to the auxiliary power supply positive electrode of the charging socket.

[0013] In an embodiment of the present invention, a fuse is provided on the power supply circuit.

[0014] In an embodiment of the present invention, a voltage dividing resistor is provided on the power supply circuit.

[0015] In an embodiment of the present invention, an anti-reverse diode is installed on the power supply circuit.

[0016] In an embodiment of the present invention, anti-reverse diodes are connected between the internal power supply lines of the vehicle controller and the first power supply positive electrode interface and the second power supply positive electrode interface respectively.

[0017] In an embodiment of the present invention, voltage acquisition points are respectively provided at the first power supply positive electrode interface and the second power supply positive electrode interface of the vehicle controller.

[0018] In an embodiment of the present invention, a method for charging an automotive storage battery uses the system for charging an automotive storage battery according to any one of claims 1 to 7, and includes the following steps:

[0019] S1: Electrically connect the charging device to the vehicle controller;

[0020] S2: The charging device supplies power to the vehicle controller;

[0021] S3: The vehicle controller determines whether the charging trigger condition is met. When the charging trigger condition is established, it enters the charging process of the storage battery to charge the storage battery through the power supply circuit. After the charging process ends, it enters step S4. Otherwise, it directly enters step S4;

[0022] S4: The vehicle controller notifies the charging device to stop charging the storage battery.

[0023] In an embodiment of the present invention, the supplementary charging process includes:

[0024] S31: The vehicle controller does not wake up other controllers and sends an emergency charging instruction to the charging device;

[0025] S32: After the auxiliary power supply of the charging device receives the emergency charging instruction sent by the vehicle controller, it continues to supply power;

[0026] S33: The auxiliary power supply continuously outputs through the power supply circuit to charge the storage battery;

[0027] S34: The vehicle controller continuously detects the state of the storage battery and determines whether the supplementary charging exit condition is met;

[0028] S35: When the supplementary charging exit condition is established, after the vehicle controller recognizes that the power of the storage battery meets the requirements, it exits the supplementary charging process.

[0029] In an embodiment of the present invention, the supplementary charging trigger condition is: the voltage of the storage battery is less than the first threshold, and the voltage of the auxiliary power supply is greater than the first threshold;

[0030] The supplementary charging exit condition is: the voltage of the storage battery is greater than the second threshold.

[0031] As described above, the system and method for charging the vehicle storage battery of the present invention have the following beneficial effects: The vehicle storage battery is charged by inserting a DC charging gun into the vehicle charging socket, which is simple to operate and has no risk of short circuit and reverse connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It shows a schematic diagram of the system circuit principle for charging a vehicle storage battery according to the present invention.

[0033] Figure 2 It shows a schematic diagram of the VCU isolation circuit in a system for charging a vehicle storage battery according to the present invention.

[0034] Figure 3 It shows a schematic diagram of the method flow for charging a vehicle storage battery according to the present invention.

[0035] Figure 4 Shown as Figure 3 The flow schematic diagram of step 3 in

[0036] Description of Component Labels

[0037] Charging device 1; DC charging pile 11; charging gun 12; DC charging socket 13; power supply circuit 2; fuse 21; voltage-dividing resistor 22; reverse current prevention diode 23; fast charging relay 3; vehicle controller / VCU 4; first power supply positive electrode interface 41; first voltage acquisition point 411; second power supply positive electrode interface 42; second voltage acquisition point 421; negative electrode interface 43; high-voltage battery controller / BECM 5; power supply positive electrode interface 51; high-voltage to low-voltage converter / DCDC 6; power supply positive electrode interface 61; storage battery 7; storage battery positive electrode 71; high-voltage battery pack 8; main relay 81. Detailed implementation manners

[0038] The following uses specific specific examples to illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other. It should also be understood that the terms used in the embodiments of the present invention are for describing specific specific implementation manners, rather than for limiting the protection scope of the present invention. The test methods without specific conditions noted in the following embodiments are usually carried out according to conventional conditions or according to the conditions recommended by each manufacturer.

[0039] Please refer to Figures 1 to 4 . It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in this technology to understand and read, and are not used to limit the limiting conditions under which the present invention can be implemented. Therefore, they do not have technical essence. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of clear narration, rather than for limiting the scope under which the present invention can be implemented. The change or adjustment of their relative relationships, without substantial change of the technical content, should also be regarded as the scope under which the present invention can be implemented.

[0040] The preferred embodiment of the present invention is as Figure 1 shown. The present invention provides a system for charging the storage battery of an automobile, including: DC charging pile 11, charging gun 12, DC charging socket 13, power supply circuit 2, fast charging relay 3, vehicle controller (VCU) 4, high-voltage battery controller (BECM) 5, high-voltage to low-voltage converter (DCDC) 6, storage battery 7 and high-voltage battery pack 8.

[0041] Among them, the DC charging pile 11, the charging gun 12, and the DC charging socket 13 all have corresponding interfaces and comply with national standards. The DC charging gun 12 is connected to the DC charging pile 11. The interfaces on the DC charging gun 12 include a high-voltage DC positive interface (DC+), a high-voltage DC negative interface (DC-), an auxiliary power positive interface (A+), an auxiliary power negative interface (A-), a ground interface (PE), a CAN high communication line interface (S+), a CAN low communication line interface (S-), a charging pile end gun line connection confirmation interface (CC1), and a vehicle end connection gun line interface (CC2). The DC charging pile 11 charges the vehicle by inserting the DC charging gun 12 into the DC charging socket 13. DC+ and DC- are used for the DC charging pile 11 to output high-voltage direct current to charge the high-voltage battery pack of the high-voltage battery 8. The DC charging pile 11 includes an auxiliary power supply, and the auxiliary power supply can output 12V direct current. A+ and A- are used for the auxiliary power supply to output 12V constant voltage power supply, with a maximum output current of 10A. S+ and S- are communication lines for information interaction between the DC charging pile 11 and the vehicle. The CC1 line contains a detection circuit for the DC charging pile 11 to confirm whether the charging gun 12 is connected to the vehicle DC charging socket 13, and the CC2 line contains a detection circuit for the vehicle to confirm whether the charging gun 12 is connected to the vehicle DC charging socket 13.

[0042] The DC charging pile 11 can process the instruction for emergency charging sent by the VCU4, specifically by setting the emergency charging flag. After receiving the instruction, the DC charging pile 11 keeps the auxiliary power supply outputting 12V direct current to charge the battery 7, and at the same time records the emergency charging flag. After the battery 7 is fully charged, the VCU4 sends an instruction to cancel the emergency charging to the charging pile, specifically by canceling the emergency charging flag. After receiving the instruction, the DC charging pile 11 stops the output of the auxiliary power supply and clears the emergency charging flag, and enters the standby state. The DC charging socket 13 includes an auxiliary power supply interface corresponding to the DC charging pile 11. The auxiliary power supply interface includes an auxiliary power supply positive and an auxiliary power supply negative. The DC charging socket 13 is correspondingly connected to the DC charging pile 11 through the charging gun 12. The emergency charging flag is a custom communication message, which is agreed upon by the VCU4 and the DC charging pile 11. For example, the communication message SPN2580 with a length of 1 byte and a value of 0xAA is used as the instruction for requesting emergency charging, and the communication message SPN2580 with a value of 0x00 is used as the instruction for canceling emergency charging.

[0043] The VCU4 includes a first power supply positive electrode interface 41 and a second power supply positive electrode interface 42. The first power supply positive electrode interface 41 is connected to the positive electrode 71 of the battery, and the second power supply positive electrode interface 42 is connected to the A+ interface of the DC charging socket 13 so that the auxiliary power supply of the DC charging pile 11 can also supply 12V DC power to the VCU4. The ground interface 43 is connected to the negative electrode of the battery 7 (not shown in the figure) and is connected to the body ground. The VCU4 is mainly responsible for information interaction with the DC charging pile 11 and can control the BECM5 and DCDC6 to complete the DC charging process. When the VCU4 works normally, the 12V power consumption is less than 120W, and the output power of the auxiliary power supply of the DC charging pile 11 can meet the normal operation of the VCU4. The VCU4 sends a work request to the DCDC6 through the CAN bus. The vehicle status is sent to the charging pile 11 through the S+ and S- communication lines.

[0044] The VCU4 is respectively provided with voltage acquisition points at the first power supply positive electrode interface 41 and the second power supply positive electrode interface 42 for voltage acquisition. The voltage of the first voltage acquisition point 411 near the first power supply positive electrode interface 41 is the 12V battery voltage, and the voltage of the second voltage acquisition point 421 near the second power supply positive electrode interface 42 is the output voltage of the DC charging pile A+. For example, if the VCU4 detects that the voltage at the first power supply positive electrode interface 41 is less than 9V and at the same time detects that the voltage at the second power supply positive electrode interface 42 is greater than 9V, the VCU4 considers that emergency charging is required at this time. The VCU4 sends an instruction to request emergency charging to the DC charging pile 11 through S+ and S-. After receiving the instruction to request emergency charging sent by the VCU4, the DC charging pile 11 makes the auxiliary power supply module continuously output 12V DC power.

[0045] The high-voltage battery pack 8 includes a high-voltage battery group and a main relay 81. The main relay includes a main positive relay and a main negative relay. The high-voltage battery pack 8 provides high voltage for the high-voltage line and can be charged by the DC charging pile 11 through DC+ and DC-. A fast-charging relay 3 responsible for the on / off of the fast-charging circuit is connected between the high-voltage battery pack 8 and the vehicle DC socket 13. The fast-charging relay 3 includes a fast-charging positive relay and a fast-charging negative relay.

[0046] The power supply positive electrode interface 51 of the BECM5 is connected to the positive electrode 71 of the battery 7. The BECM5 is mainly responsible for closing the high-voltage main relay 81 and the fast-charging relay 3, so as to establish high voltage on the high-voltage line for the DCDC to work. After the BECM5 gets normal battery power supply, it closes the main relay 81 and the fast-charging relay 3. The BECM5 sends the relay status to the VCU4 through CAN bus communication.

[0047] The positive power supply interface 61 of DCDC6 is connected to the positive battery terminal 71 of the battery 7. DCDC6 converts the high-voltage direct current in the high-voltage line into 12V direct current to charge the battery 7. The positive power supply interface 61 of DCDC6 is the only 12V positive interface of DCDC6. When DCDC6 works, it converts high voltage into 12V electricity. Before working, it relies on the electricity of the battery 7 to enter the working state. After entering the working state, DCDC6 outputs a voltage slightly higher than the low voltage to charge the low-voltage battery 7 and also supply power to itself.

[0048] The VCU4 is provided with a negative interface 43. The BECM5 and DCDC6 also have negative interfaces (not shown in the figure) connected to the negative battery terminal of the battery 7 (not shown in the figure) and are also connected to the body ground.

[0049] The battery 7 supplies power to the VCU4, BECM5, and DCDC6 through the first positive power supply interface 41 of the VCU4, the positive power supply interface 51 of the BECM5, and the positive power supply interface 61 of the DCDC6 respectively, enabling them to work normally. The time for charging the battery 7 is related to the battery capacity. A 50Ah battery generally requires 30 minutes. It is possible to judge whether the charging is completed according to the charging voltage. For example, when the terminal voltage of the first positive power supply interface 41 of the VCU4 reaches 11.5V, it is considered that the charging is completed. These thresholds are all configurable.

[0050] The input end of the power supply circuit 2 is connected to A+ of the vehicle DC charging socket 13, and the output end is connected to the positive battery terminal 71 of the battery 7. A fuse 21, a voltage-dividing resistor 22, and an anti-reverse diode 23 are provided on the power supply circuit 2. The fuse 21 is to prevent overcurrent when the auxiliary power supply charges the battery 7. The fuse is selected according to 2 times the current capacity, and preferably a 20A fuse can be selected. The voltage-dividing resistor 22 is to ensure that the current when the auxiliary power supply charges the battery 7 does not exceed the maximum output capacity of 10A of the auxiliary power supply. The selection of the voltage-dividing resistor 22 is matched according to the specific minimum discharged voltage and charging polarization voltage of the battery to ensure that when the auxiliary power supply outputs 12V direct current, its maximum output current does not exceed 10A. The calculation formula is as follows and needs to be matched according to the specific battery characteristics: The anti-reverse diode 23 is to prevent the external A+ and A- interfaces of the DC charging socket 13 from being short-circuited and burning out the circuit. The anti-reverse diode 23 can be selected according to the maximum current of 10A in the power supply circuit 2 and the reverse breakdown voltage.

[0051] Such as Figure 2As shown, the VCU4 is provided with a second positive power supply interface 42, and the second positive power supply interface 42 is connected to A+. That is, the auxiliary power supply of the DC charging pile 11 can also supply 12V low-voltage direct current to the VCU4. The first positive power supply interface 41 and the second positive power supply interface 42 are respectively isolated from the internal 12V power supply line of the VCU4 by an anti-reverse diode 44 and an anti-reverse diode 45. When either the battery 7 or the auxiliary power supply can output 12V electricity, it can ensure the normal operation of the VCU4. The VCU4 is provided with a first voltage acquisition point 411 near the first positive power supply interface 41 and a second voltage acquisition point 421 near the second positive power supply interface 42. By collecting the voltage, the power shortage situation of the current low-voltage battery 7 can be known. For example, when the voltage of the first voltage acquisition point 411 is less than 9V (TBD), it is considered that the battery 7 is power short, thereby activating the emergency charging process.

[0052] Figure 1 The method for charging the battery 7 in the system shown in

[0053] Step 1: Insert the charging gun 12 on the DC charging pile 11 into the vehicle DC charging socket 13;

[0054] Step 2: The DC charging pile 11 recognizes the connection of the charging gun 12 through CC1, the auxiliary power supply of the vehicle DC charging pile 11 starts to output, and sends information to the VCU4 to initiate the DC charging process;

[0055] Step 3: When the vehicle's VCU4 recognizes the connection of the charging gun 12 through CC2 and determines that the battery is power short, the VCU4 does not respond to the DC charging request, does not wake up other controllers, and sends a request for emergency charging instruction to the DC charging pile 11 through S+ and S-;

[0056] Step 4: After receiving the request for emergency charging instruction sent by the VCU4, the DC charging pile 11 makes the auxiliary power supply of the DC charging pile 11 continue to supply power;

[0057] Step 5: The auxiliary power supply of the DC charging pile 11 continuously outputs through the power supply loop 2 to charge the battery 7;

[0058] Step 6: The battery 7 starts to be charged and is fully charged after a period of time.

[0059] In this preferred embodiment, the recharge trigger condition is that the voltage of the storage battery 7 is less than the first threshold, and the voltage of the auxiliary power supply is greater than the first threshold. The recharge exit condition is that the voltage of the storage battery 7 is greater than the second threshold. Both the first threshold and the second threshold can be set by oneself. For example, the first threshold can be set to 9V. The VCU4 collects voltages at the first power supply positive electrode interface 41 and the second power supply positive electrode interface 42 respectively. The voltage at the first power supply positive electrode interface 41 is the voltage of the storage battery, and the voltage at the second power supply positive electrode interface 42 is the output voltage of the auxiliary power supply A+ of the DC charging pile. When the VCU4 detects that the voltage at the first power supply positive electrode interface 41 is less than 9V and at the same time detects that the voltage at the second power supply positive electrode interface 42 is greater than 9V, the VCU4 considers that emergency charging is needed at this time. The VCU4 sends a request for emergency charging instruction to the DC charging pile 11 through S+ and S-. After receiving the request for emergency charging instruction sent by the VCU4, the DC charging pile 11 makes the auxiliary power supply module continuously output for the storage battery to recharge. The second threshold can be set to 11.5V. The storage battery 7 will send the battery state to the VCU4. After the VCU4 recognizes that the power of the storage battery 7 is greater than 11.5V, it will stop the recharge. The VCU4 sends an instruction to cancel the emergency charging to the DC charging pile 11. After receiving the instruction, the DC charging pile 11 stops the output of the auxiliary power supply and clears the emergency charging flag, and enters the standby state. At this time, the charging gun 12 can be disconnected to end the charging.

[0060] The low voltage range of the above embodiments can be from 9V to 16V.

[0061] Figure 3 It shows a method flow for recharging the vehicle storage battery 7, including the following steps:

[0062] S1: Electrically connect the charging device to the vehicle controller 4;

[0063] Specifically, insert the charging gun 12 into the DC charging socket 13. The DC charging pile 11 recognizes the connection of the charging gun 12 through CC1. The auxiliary power supply of the DC charging pile 11 outputs 12V electricity. The DC charging pile 11 sends information to the VCU4 through S+ and S-, initiates the DC charging process, and the VCU4 of the vehicle recognizes the connection of the charging gun 12 through CC2.

[0064] S2: The charging device 1 supplies power to the vehicle controller 4;

[0065] Specifically, the DC charging pile 11 supplies power to the VCU4 through the auxiliary power supply so that it can work normally.

[0066] S3: The vehicle controller 4 determines whether the recharge trigger condition is met. When the recharge trigger condition is established, it enters the recharge process of the storage battery 7 and recharges the storage battery 7 through the power supply circuit. After the recharge process ends, it enters step S4. Otherwise, it directly enters step S4;

[0067] Specifically, VCU4 compares the detected voltages at the first voltage acquisition point 411 and the second voltage acquisition point 421. When it detects that the voltage at the first power supply positive interface 41 is less than 9V and the voltage at the second power supply positive interface 42 is greater than 9V, VCU4 sends a notice to charge the battery 7. If the above conditions are not met, the charging process will not be entered.

[0068] S4: The vehicle controller 4 notifies the charging device 1 to stop charging the battery 7.

[0069] Figure 4 The charging process in S3 is shown, including the following steps:

[0070] S31: The vehicle controller 4 does not wake up other controllers and sends a request for emergency charging instruction to the charging device 1.

[0071] Specifically, VCU4 does not wake up BECM5 and DCDC6 and sends a request for emergency charging instruction to the DC charging pile 11.

[0072] S32: After the auxiliary power supply of the charging device 1 receives the request for emergency charging instruction sent by the vehicle controller 4, it continues to supply power.

[0073] Specifically, after the DC charging pile 11 receives the request for emergency charging instruction sent by VCU4, it makes the auxiliary power supply continue to supply power.

[0074] S33: The auxiliary power supply continuously outputs through the power supply loop 2 to charge the battery 7.

[0075] S34: The vehicle controller 4 continuously detects the state of the battery 7 and determines whether the charging exit condition is met.

[0076] Specifically, the battery 7 sends the battery state to VCU4, and VCU4 determines whether the battery 7 has completed charging.

[0077] S35: When the charging exit condition is established, the vehicle controller 4 exits the charging process after recognizing that the battery 7 has sufficient power.

[0078] Specifically, the battery 7 sends the battery state to VCU4. When VCU4 recognizes that the battery 7 voltage is greater than 11.5V, it will stop charging.

[0079] VCU4 sends an instruction to cancel the emergency charging to the charging pile. After receiving the instruction, the DC charging pile 11 stops the output of the auxiliary power supply and clears the emergency charging flag, and enters the standby state.

[0080] After the battery 7 completes charging, the vehicle can enter the normal DC charging process, including the following steps:

[0081] S5: The VCU4 requests the BECM5 to close the main relay of the high-voltage battery pack 8. The BECM5 closes the main relay, and the vehicle establishes high voltage through the high-voltage battery pack 8.

[0082] S6: The VCU4 requests the BECM5 to close the fast-charging relay 3. The BECM5 closes the fast-charging relay 3 and sends the statuses of the main relay and the fast-charging relay 8 to the VCU4.

[0083] S7: The VCU4 requests the DCDC6 to work and feeds back the vehicle status to the DC charging pile 11 through S+ and S-.

[0084] S8: The DCDC7 converts the high voltage into 12V to supply power to the 12V loads VCU4, BECM5, and DCDC6 and ensures the normal status of the storage battery 7.

[0085] S9: The DC charging pile outputs high-voltage direct current through DC+ and DC- to charge the high-voltage battery pack of the high-voltage battery pack 8.

[0086] S10: Start DC charging.

[0087] In summary, for the present invention to replenish the power of the vehicle storage battery with a DC charging pile, it only needs to connect the power by inserting the DC charging gun into the vehicle charging socket. The operation is simple and there is no risk of short circuit or reverse connection. Therefore, the present invention effectively overcomes various disadvantages in the prior art and has high industrial utilization value.

[0088] The above embodiments merely illustrate the principles and effects of the present invention and are not used to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A system for charging an automotive battery, the system being electrically connected to a charging device, the charging device including a charging pile, a charging gun, and a charging socket; The charging pile has an auxiliary power supply, the charging socket includes an auxiliary power supply interface corresponding to the charging pile, the auxiliary power supply interface includes an auxiliary power supply positive electrode and an auxiliary power supply negative electrode, and the charging socket is correspondingly connected to the charging pile through the charging gun; The system includes: A battery; A vehicle controller, the vehicle controller includes a first power supply positive electrode interface and a second power supply positive electrode interface, the first power supply positive electrode interface is connected to the battery positive electrode, and the second power supply positive electrode interface is connected to the auxiliary power supply positive electrode of the charging socket; and A power supply circuit disposed inside the vehicle, the input end of the power supply circuit is electrically connected to the charging device and the second power supply positive electrode interface of the vehicle controller respectively, and the output end is electrically connected to the battery; When the battery is out of power, while the charging device powers the vehicle controller, it charges the battery through the power supply circuit.

2. The system for charging the automotive battery according to claim 1, wherein: When the charging pile receives an emergency charging instruction sent by the vehicle controller, it maintains the output of the auxiliary power supply, and when the emergency charging instruction is revoked, it stops the output of the auxiliary power supply.

3. The system for charging an automotive battery according to claim 1, wherein: A fuse is provided on the power supply circuit.

4. The system for charging an automotive battery according to claim 1, wherein: A voltage dividing resistor is provided on the power supply circuit.

5. The system for charging an automotive battery according to claim 1, characterized in that: An anti - reverse diode is installed on the power supply circuit.

6. The system for replenishing power to an automotive battery according to claim 2, wherein: Anti - reverse diodes are connected between the internal power supply lines of the vehicle controller and the first power supply positive electrode interface and the second power supply positive electrode interface respectively.

7. The system for charging the automotive battery according to claim 2, wherein: Voltage acquisition points are respectively provided at the first power supply positive electrode interface and the second power supply positive electrode interface of the vehicle controller.

8. A method for charging an automotive battery, using the system for charging an automotive battery according to any one of claims 1 to 7, including the following steps: S1: Electrically connect the charging device and the vehicle controller; S2: The charging device supplies power to the vehicle controller; S3: The vehicle controller determines whether the charging trigger condition is met. When the charging trigger condition is established, it enters the charging process of the battery and charges the battery through the power supply circuit. After the charging process ends, it enters step S4, otherwise it directly enters step S4; S4: The vehicle controller notifies the charging device to stop charging the battery.

9. The method for charging an automotive battery according to claim 8, characterized in that: The charging process includes: S31: The vehicle controller does not wake up other controllers and sends an emergency charging instruction to the charging device; S32: After the auxiliary power supply of the charging device receives the emergency charging instruction sent by the vehicle controller, it continuously supplies power; S33: The auxiliary power supply continuously outputs through the power supply circuit to charge the battery; S34: The vehicle controller continuously detects the state of the battery and determines whether the charging exit condition is met; S35: When the charging exit condition is established, the vehicle controller exits the charging process after recognizing that the battery power meets the requirements.

10. The method for charging an automotive battery according to claim 9, characterized in that: The charging trigger condition is: the voltage of the battery is less than a first threshold, and the voltage of the auxiliary power supply is greater than the first threshold; The supplementary power-off condition is that the voltage of the storage battery is greater than the second threshold value.

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