System and method for recharging automobile batteries

Abstract

The present invention provides a system and method for recharging an automotive battery. The system electrically connects a charging device to a DC-DC (direct current distribution center), a BECM (back-up control module), and a VCU (voltage control unit). The charging device supplies power to the VCU, BECM, and DC-DC. The VCU determines when the battery is low and initiates the battery recharging process. Once recharging is complete, the charging device is disconnected. This solves the problem of using external jumpering to address low battery power, which requires a battery jumper cable. This requires numerous conditions, is inconvenient to operate, and poses the risk of shorting and reverse connection, which can damage wiring or vehicle equipment.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to a system and method for replenishing power for a vehicle battery. Background Art

[0002] The battery of a new energy vehicle needs to power the vehicle control system when the vehicle is parked. If the vehicle is left unused for an extended period, the battery will become depleted, causing the vehicle control system to malfunction and rendering the vehicle unusable. Currently, no charging equipment is available to recharge vehicle batteries. Existing technical solutions address this problem by connecting battery jumper cables and using jumper cables and equipment to jumper the battery, thus addressing the issue of battery depletion through external jumpering. However, existing solutions require a wide range of jumpering requirements and are inconvenient to operate. Jumpering the battery also carries the risk of short circuits and reverse connections, which can damage wiring or vehicle equipment. Summary of the Invention

[0003] In view of the above shortcomings of the prior art, an object of the present invention is to provide a system and method for recharging a vehicle battery, so as to solve the problem that there is no charging device in the prior art that can recharge a vehicle battery.

[0004] To achieve the above-mentioned and other related purposes, the present invention provides a system and method for recharging a vehicle battery, and proposes a method for recharging a battery of a new energy vehicle using a DC charging pile to solve the problem of low battery in the vehicle battery.

[0005] In one embodiment of the present invention, a system for charging a vehicle battery is provided. The system is electrically connected to a charging device and includes:

[0006] Vehicle controller VCU;

[0007] High-voltage battery controller BECM;

[0008] High-voltage to low-voltage converter DCDC, and

[0009] a battery, the battery being electrically connected to the VCU, the BECM, and the DCDC respectively;

[0010] When the battery is low on power, the charging device supplies power to the VCU, the BECM, and the DCDC respectively so that they can operate normally, and then the VCU notifies the DCDC to replenish power to the battery.

[0011] In one embodiment of the present invention, the VCU includes a first power positive interface and a second power positive interface. The positive electrode of the battery is electrically connected to the first power positive interface, and the positive electrode of the auxiliary power interface is electrically connected to the second power positive interface. The VCU initiates a power replenishment process and controls the BECM and the DCDC to replenish the battery.

[0012] In one embodiment of the present invention, anti-reverse diodes are connected between the internal power supply circuit of the VCU and the first power positive electrode interface and the second power positive electrode interface respectively.

[0013] In one embodiment of the present invention, a high-voltage battery pack is included, and the BECM includes a third positive power supply interface and a fourth positive power supply interface. The positive electrode of the battery is electrically connected to the third positive power supply interface, and the positive electrode of the auxiliary power supply interface is electrically connected to the fourth positive power supply interface. The BECM controls the high-voltage battery pack to enable the vehicle to generate high voltage for the DCDC operation.

[0014] In one embodiment of the present invention, anti-reverse diodes are connected between the internal power supply circuit of the BECM and the third power positive electrode interface and the fourth power positive electrode interface respectively.

[0015] In one embodiment of the present invention, the DCDC includes a fifth power positive interface and a sixth power positive interface, the battery positive electrode is electrically connected to the fifth power positive interface, and the auxiliary power interface positive electrode is electrically connected to the sixth power positive interface. The DCDC converts the high voltage electricity of the high voltage battery pack into low voltage electricity for replenishing the battery.

[0016] In one embodiment of the present invention, anti-reverse diodes are connected between the internal power supply circuit of the DCDC and the fifth power positive electrode interface and the sixth power positive electrode interface respectively.

[0017] In one embodiment of the present invention, the charging device includes a charging pile, a charging gun and a charging socket;

[0018] The charging pile has an auxiliary power supply, and when the charging pile receives an emergency charging instruction issued by the vehicle controller, the auxiliary power supply is maintained output, and when the emergency charging instruction is revoked, the auxiliary power supply is stopped output;

[0019] The charging pile is connected to the charging socket through the charging gun. The charging socket includes an auxiliary power interface corresponding to the charging pile. The auxiliary power interface includes an auxiliary power positive electrode and an auxiliary power negative electrode. The charging socket is connected to the charging pile through the charging gun.

[0020] In one embodiment of the present invention, a method for recharging a vehicle battery, using the system for recharging a vehicle battery as described in any of the above embodiments, includes the following steps:

[0021] S1: The charging device is electrically connected to the DCDC, BECM and VCU respectively;

[0022] S2: The charging device supplies power to the VCU, the BECM, and the DCDC;

[0023] S3: The VCU determines that the battery is low on power and starts a charging process for the battery;

[0024] S4: Disconnect the charging device and the charging is completed.

[0025] In one embodiment of the present invention, the power replenishment process in step S3 includes the following steps:

[0026] S31: When the battery is low on power, the charging device supplies power to the VCU, the BECM, and the DCDC through the auxiliary power interface to enable them to operate normally. The VCU then requests the BECM to control the high-voltage battery pack to generate high voltage to supply the DCDC. The DCDC converts the high voltage power into low voltage power for supplying power to the battery. If the battery is not low on power, the process directly proceeds to S33.

[0027] S32: the battery continues to be charged until the battery is fully charged;

[0028] S33: The VCU requests the DCDC to output an operating voltage to maintain the battery in a normal state.

[0029] As described above, the system and method for charging a vehicle battery of the present invention have the following beneficial effects: A DC charging station can be used to charge a vehicle's 12V battery, allowing for jump-charging using common equipment. Jump-charging is achieved by plugging a DC charging plug into the vehicle's charging socket, eliminating the risk of short circuits or reverse connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Shown is a schematic diagram of a system for recharging a car battery according to the present invention.

[0031] Figure 2 Shown is a schematic diagram of the internal isolation circuits of the VCU, BECM and DCDC in a system for replenishing power for a vehicle battery according to the present invention.

[0032] Figure 3 A flow chart showing a method of recharging a vehicle battery.

[0033] Figure 4Display as Figure 3 The power replenishment flow chart for step 3 in [1].

[0034] Component number description

[0035] Charging device 1; DC charging pile 11; charging gun 12; DC charging socket 13; high-voltage battery pack 2; main relay 21 fast charging relay 3; vehicle controller / VCU 4; first power supply positive electrode interface 41; second power supply positive electrode interface 42; negative electrode interface 43; first anti-reverse diode 44; second anti-reverse diode 45; high-voltage battery controller / BECM 5; third power supply positive electrode interface 51; fourth power supply positive electrode interface 52; third anti-reverse diode 53; fourth anti-reverse diode 54; high-voltage to low-voltage converter / DCDC6; fifth power supply positive electrode interface 61; sixth power supply positive electrode interface 62; fifth anti-reverse diode 63; sixth anti-reverse diode 64; battery 7; battery positive electrode 71. DETAILED DESCRIPTION

[0036] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the 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 the following examples and the features in the examples can be combined with each other unless they conflict. It should also be understood that the terms used in the examples of the present invention are for the purpose of describing specific embodiments, not for the purpose of limiting the scope of protection of the present invention. The test methods for which specific conditions are not specified in the following examples are generally carried out under conventional conditions or under the conditions recommended by the manufacturers.

[0037] See also Figures 1 to 4 . It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they have no substantive technical significance. Any modification of the structure, change in the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0038] The automobiles covered by this invention include both low-voltage and high-voltage electrical systems. The low-voltage system, in addition to powering conventional low-voltage appliances such as lighting, entertainment systems, and windshield wipers, also supplies power to the vehicle controller, battery management system, motor controller, high-voltage-to-low-voltage converter, and control circuits for high-voltage accessories such as electric air conditioners. It typically utilizes a 12V power supply system. The high-voltage system primarily includes the power battery pack, electric drive system, high-voltage-to-low-voltage converter, electric air conditioner, electric heater, onboard charging system, off-board charging system, and high-voltage electrical safety management system. Its voltage generally ranges from 200V to 750V. "High voltage" as used in this invention refers to the voltage corresponding to the high-voltage electrical system, while "low voltage" refers to the voltage corresponding to the low-voltage electrical system.

[0039] Preferred embodiments of the present invention are Figure 1 As shown, the present invention provides a system for recharging a vehicle battery, comprising: a DC charging pile 11, a charging gun 12, a DC charging socket 13, a fast charging relay 3, a vehicle controller (VCU) 4, a high-voltage battery controller (BECM) 5, a high-voltage to low-voltage converter (DCDC) 6, a battery 7 and a high-voltage battery pack 2.

[0040] The charging device of the present invention includes a DC charging pile 11, a charging gun 12, and a DC charging socket 13, all of which have corresponding interfaces and comply with national standards. The DC charging pile 11 is connected to the DC charging gun 12. The interfaces on the DC charging gun 12 include a high-voltage DC positive terminal (DC+), a high-voltage DC negative terminal (DC-), an auxiliary power supply positive terminal (A+), an auxiliary power supply negative terminal (A-), a grounding terminal (PE), a CAN high communication line interface (S+), a CAN low communication line interface (S-) (CAN stands for Controller Area Network (CAN)), a charging pile-side gun line connection confirmation interface (CC1), and a vehicle-side gun line connection interface (CC2). The DC charging pile 11 is connected to the DC charging socket 13 via the DC charging gun 12 to charge the vehicle. The DC+ and DC- terminals are used by the DC charging pile 11 to output high-voltage DC power to charge the high-voltage battery pack 8. The DC charging pile 11 includes an auxiliary power supply that can output 12V DC power. A+ and A- are used for auxiliary power, providing a 12V constant voltage output with a maximum output current of 10A. S+ and S- are communication lines, used for information exchange between the DC charging station 11 and the vehicle. The CC1 line contains a detection circuit for the DC charging station 11 to confirm whether the charging gun 12 is connected to the vehicle's DC charging socket 13. The CC2 line contains a detection circuit for the vehicle to confirm whether the charging gun 12 is connected to the vehicle's DC charging socket 13.

[0041] The DC charging station 11 is connected to the vehicle's DC charging socket 13 via a charging gun 12 to charge the vehicle. The DC charging socket 13 includes an auxiliary power supply interface corresponding to the DC charging station 11. The auxiliary power supply interface includes an auxiliary power positive electrode and an auxiliary power negative electrode. The DC charging socket 13 is connected to the DC charging station 11 via the charging gun 12.

[0042] The VCU4 includes a first positive power supply interface 41 and a second positive power supply interface 42. The first positive power supply interface 41 is connected to the battery positive terminal 71. The second positive power supply interface 42 is connected to the A+ interface of the DC charging socket 13, allowing the auxiliary power supply of the DC charging station 11 to also power the VCU4. The VCU4 is primarily responsible for information exchange with the DC charging station 11 and controls the BECM5 and DCDC6 to complete the DC charging process. The VCU4 sends work requests to the DCDC6 via the CAN bus. The vehicle status is transmitted to the charging station 11 via the S+ and S- communication lines.

[0043] The high-voltage battery pack 2 includes a high-voltage battery pack and a main relay 21, which includes a main positive relay and a main negative relay. The high-voltage battery pack 2 provides high voltage to the high-voltage circuit and can be charged by the DC charging station 11 via DC+ and DC-. A fast-charging relay 3, which is connected between the high-voltage battery pack 2 and the vehicle's DC socket 13 and is responsible for opening and closing the fast-charging circuit, is connected. The fast-charging relay 3 includes a fast-charging positive relay and a fast-charging negative relay.

[0044] The third positive power supply port 51 of the BECM 5 is connected to the positive terminal 71 of the battery 7. The BECM 5 is primarily responsible for closing the high-voltage main relay 21 and the fast-charge relay 3, thereby establishing high voltage on the high-voltage line for DC-DC operation. Once the BECM 5 receives a normal 12V power supply, it closes the main relay 21 and the fast-charge relay 3. The BECM 5 transmits these relay states to the VCU 4 via CAN bus communication.

[0045] The fifth positive power supply interface 61 of the DCDC 6 is connected to the positive battery terminal 71 of the battery 7. The DCDC 6 converts the high-voltage DC power in the high-voltage line into low-voltage DC power to power the VCU 4 and BECM 5, while maintaining the normal state of the battery 7. When the battery is low on power, the DCDC 6 charges the low-power battery 7.

[0046] The battery 7 supplies power to the VCU4 , BECM5 and DCDC6 through the first positive power interface 41 of the VCU4 , the third positive power interface 51 of the BECM5 and the fifth positive power interface 61 of the DCDC6 , respectively, so that they can work normally.

[0047] The auxiliary power positive terminal (A+) of the DC charging socket 13 is connected to the second power positive terminal 42 of the VCU4, the fourth power positive terminal 52 of the BECM5, and the sixth power positive terminal 62 of the DCDC6. The auxiliary power of the DC charging station 11 is supplied to the VCU4, BECM5, and DCDC6 through the auxiliary power positive terminal (A+) of the DC charging socket 13. When the VCU4, BECM5, and DCDC6 are operating normally, the 12V power consumption is less than 120W. The output power of the auxiliary power of the DC charging station 11 can meet the normal operation of the VCU4, BECM5, and DCDC6.

[0048] The VCU 4 is provided with a negative electrode interface 43 , and the BECM 5 and the DCDC 6 also have negative electrode interfaces (not shown in the figure) connected to the negative electrode (not shown in the figure) of the battery 7 and connected to the vehicle body ground.

[0049] Figure 2 The diagram shows a first anti-reverse diode 44 connected between the internal power supply line of VCU4 and the first positive power supply interface 41, and a second anti-reverse diode 45 connected between the internal power supply line of VCU4 and the second positive power supply interface 42. A third anti-reverse diode 53 is connected between the internal power supply line of BECM5 and the third positive power supply interface 51, and a fourth anti-reverse diode 54 is connected between the internal power supply line of BECM5 and the fourth positive power supply interface 52. A fifth anti-reverse diode 63 is connected between the internal power supply line of DCDC6 and the fifth positive power supply interface 61, and a sixth anti-reverse diode 64 is connected between the internal power supply line of DCDC6 and the sixth positive power supply interface 62.

[0050] Figure 3 A method for recharging a car battery comprises the following steps:

[0051] S1: The charging device is electrically connected to the DCDC4, BECM5 and VCU6 respectively;

[0052] Specifically, the charging gun 12 is inserted into the DC charging socket 13, and the DC charging pile 11 recognizes the connection of the charging gun 12 through CC1;

[0053] S2: Charging device 1 supplies power to VCU4, BECM5 and DCDC6;

[0054] Specifically, the auxiliary power supply of the DC charging pile 11 starts to supply power and sends information to the VCU 4 to initiate the DC charging process.

[0055] S3: After the VCU4 recognizes that the charging gun 12 is connected through CC2, when the VCU4 detects that the battery 7 is low on power, it starts the charging process of the battery 7;

[0056] The VCU4 determines whether the battery 7 is low on power. If so, it initiates the battery recharge procedure. Specifically, the VCU4 requests the DCDC6 to enter the operating state, after which the DCDC6 converts the high voltage to a low voltage. Based on the battery 7's temperature and SOC (State of Charge, also known as the remaining capacity, indicating the battery's ability to continue operating), the VCU6 requests the DCDC6 to output an appropriate low voltage to charge the battery 7.

[0057] S4: Disconnect the charging device 1 and the charging is completed.

[0058] Figure 4 It shows that step 3 of the power replenishment method includes the following process:

[0059] S31: When the battery 7 is low on power, the charging device 1 supplies power to the VCU 4, BECM 5, and DCDC 6 through the auxiliary power supply positive terminal A+ to enable them to operate normally. The VCU 4 then requests the BECM 5 to control the high-voltage battery pack 2 to generate high voltage power for the DCDC 6. The DCDC 6 converts the high voltage power into low voltage power to replenish the battery 7. If the battery is not low on power, the process directly proceeds to S33.

[0060] Specifically, the auxiliary power supply of the DC charging pile 11 supplies power to the VCU4, BECM5 and DCDC6 through the second power positive electrode interface 42 of the VCU4, the fourth power positive electrode interface 52 of the BECM5 and the sixth power positive electrode interface 62 of the DCDC6.

[0061] The DC charging pile 11 sends information to the VCU4 via S+ and S- to initiate the DC charging process;

[0062] The VCU4 requests the high-voltage battery controller BECM5 to close the main relay 21;

[0063] BECM5 closes the main relay 21 to establish high voltage, then closes the fast charge relay 3, and sends the relay status to VCU4.

[0064] VCU4 requests DCDC6 to work and feeds back the vehicle status to the DC charging pile 11 through S+ and S-.

[0065] The DC charging station 11 outputs high-voltage DC power through DC+ and DC- to charge the high-voltage battery pack.

[0066] DCDC6 converts high voltage electricity into low voltage electricity that can be used to charge the battery, charges the depleted battery 7, and supplies power to VCU4, BECM5 and DCDC6.

[0067] S32: The battery 7 continues to be charged until the battery 7 is fully charged;

[0068] S33: VCU4 requests DCDC6 to output the operating voltage to maintain the battery 7 in a normal state.

[0069] In summary, the present invention provides a system and method for recharging a vehicle battery, and proposes a method for recharging a vehicle battery using a DC charging pile to solve the problem of low battery in the vehicle. When the battery is low, the vehicle battery is charged by inserting a charging gun connected to the DC charging pile. The DC charging gun and the vehicle's charging socket are standard interfaces, and there is no risk of short circuit or reverse connection. The battery can be charged by simply inserting the DC charging gun for DC charging. No external equipment is required, and the conditions are easy to meet. Therefore, the present invention effectively overcomes the various shortcomings of the prior art and has high industrial utilization value.

[0070] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A system for recharging a vehicle battery, the system being electrically connected to a charging device comprising 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 interface corresponding to the charging pile, the auxiliary power interface includes an auxiliary power interface positive electrode and an auxiliary power interface negative electrode, and the charging socket is connected to the charging pile via the charging gun; The system comprises: A vehicle controller VCU, the VCU comprising a second positive power supply interface; a high-voltage battery controller (BECM), the BECM including a fourth power supply positive electrode interface; A high-voltage to low-voltage converter DCDC, the DCDC including a sixth power supply positive electrode interface, and a battery, the battery being electrically connected to the VCU, the BECM, and the DCDC respectively; When the battery is depleted, the positive electrode of the auxiliary power interface is electrically connected to the second power positive interface, the fourth power positive interface, and the sixth power positive interface, respectively, to supply power to the VCU, the BECM, and the DCDC, respectively, so that they can operate normally. Then, the VCU notifies the DCDC to replenish power to the battery.

2. The system for recharging a vehicle battery according to claim 1, characterized in that: The VCU includes a first power supply positive electrode interface, the battery positive electrode is electrically connected to the first power supply positive electrode interface, the VCU initiates a power replenishment process, and controls the BECM and the DCDC to replenish power to the battery.

3. The system for recharging a vehicle battery according to claim 2, characterized in that: Anti-reverse diodes are connected between the internal power supply circuit of the VCU and the first power positive electrode interface and the second power positive electrode interface respectively.

4. The system for recharging a vehicle battery according to claim 1, wherein: A high-voltage battery pack is included, the BECM includes a third power positive electrode interface, the battery positive electrode is electrically connected to the third power positive electrode interface, and the BECM controls the high-voltage battery pack to enable the vehicle to establish high voltage for the DCDC to work.

5. The system for recharging a car battery according to claim 4, characterized in that: Anti-reverse diodes are connected between the internal power supply circuit of the BECM and the third power supply positive electrode interface and the fourth power supply positive electrode interface respectively.

6. The system for recharging a car battery according to claim 4, characterized in that: The DCDC includes a fifth power positive electrode interface, the battery positive electrode is electrically connected to the fifth power positive electrode interface, and the DCDC converts the high voltage electricity of the high voltage battery pack into low voltage electricity for replenishing the battery.

7. The system for recharging a car battery according to claim 6, characterized in that: Anti-reverse diodes are connected between the internal power supply circuit of the DCDC and the fifth power positive electrode interface and the sixth power positive electrode interface respectively.

8. The system for recharging a vehicle battery according to claim 1, characterized in that: When the charging pile receives the emergency charging instruction issued by the vehicle controller, the auxiliary power output is maintained; when the emergency charging instruction is revoked, the auxiliary power output is stopped.

9. A method for recharging an automobile battery, using the system for recharging an automobile battery according to any one of claims 1 to 8, comprising the following steps: S1: The charging device is electrically connected to the DCDC, BECM and VCU respectively; S2: The charging device supplies power to the VCU, the BECM, and the DCDC; S3: The VCU determines that the battery is low on power and starts a charging process for the battery; S4: Disconnect the charging device and complete the charging.

10. The method for recharging a car battery according to claim 9, characterized in that: The power replenishment process of step S3 includes the following steps: S31: When the battery is low on power, the charging device supplies power to the VCU, the BECM, and the DCDC through the auxiliary power interface to enable them to operate normally. The VCU then requests the BECM to control the high-voltage battery pack to generate high-voltage power for supplying to the DCDC. The DCDC converts the high-voltage power into low-voltage power for supplying power to the battery. If the battery is not low on power, the process directly proceeds to S33. S32: the battery continues to be charged until the battery is fully charged; S33: The VCU requests the DCDC to output an operating voltage to maintain the battery in a normal state.

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