Quick charge control system

Abstract

The invention discloses a quick charge control system, which comprises a power battery; the first port of the main negative relay is electrically connected with the negative electrode of the power battery, and the second port of the main negative relay is electrically connected with the negative electrode of the quick charging interface of the power battery; the first port of the pre-charging unit is electrically connected with the positive electrode of the power battery, and the pre-charging unit can reduce the impact current generated in the loop; the first port of the fast charging relay is electrically connected with the second port of the pre-charging unit, and the second port of the fast charging relay is electrically connected with the positive electrode of the fast charging interface; the battery management controller is electrically connected with the quick charging interface, the quick charging relay and a control port of the main negative relay, and is configured to obtain a charging gun insertion signal through the quick charging interface, and the charging gun insertion signal represents that the charging gun of the charging column is inserted into the quick charging interface; the main negative relay and the fast charging relay are controlled to be closed in response to the charging gun insertion signal, the charging time is saved, and the charging efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of new energy technologies, and more specifically, to a fast charging control system. Background Art

[0002] With the development of the new energy industry, safety has received more and more attention, especially the safety of power batteries. The safety of power batteries mainly considers the rationality of the design of its internal high-voltage circuit and the ability of the internal circuit to avoid damage to abnormal situations, so as to avoid damage to components or even danger in the event of an accident.

[0003] like Figure 1 As shown, the conventional fast charging circuit of electric vehicles is to connect the fast charging relay 102 in parallel with the main positive relay 105, the pre-charging relay 103 and the pre-charging resistor 104, and the fast charging relay 102 directly bypasses the main positive relay 105 and connects to the positive pole of the power battery 101. According to the national standard charging process, when the fast charging gun is plugged in, the vehicle-side fast charging relay 102 and the main negative relay 106 are closed first, and at this time the voltage U2 is equal to the battery voltage U1; under normal circumstances, after the pile end detects the voltage U2, it will use the voltage U2 as a reference to pre-charge the capacitor C1; when the voltage U3 at the capacitor C1 end and the voltage U2 at the battery end are within a reasonable voltage difference, the charging pile end will close the high-voltage relays K1 and K2 to charge the battery, because at this time the voltage difference on both sides of the fast charging relay 102 is not large, and the impact on the fast charging relay 102 is very small, and no damage will be caused. However, when there is an abnormality at the charging pile end, the high-voltage relays K1 and K2 will be controlled to close before the fast-charging relay 102 and the main negative relay 106 at the vehicle end are closed. At this time, the charging pile end has not pre-charged the capacitor C1, which will cause the front end U1 of the fast-charging relay 102 to be much larger than the rear end voltage U2 of the fast-charging relay 102 when the fast-charging relay 102 at the vehicle end is energized. At this time, the resistance in the high-voltage circuit where the high-voltage load 107 is located is close to 0 and there is no protective resistance to limit the impact current. The large current formed in the circuit due to the excessive voltage difference can easily cause the fast-charging relay 102 to stick and be damaged. Summary of the invention

[0004] In view of this, the present invention provides a fast charging control system, which can improve the problem of adhesion and damage of the fast charging relay at the vehicle end caused by abnormalities at the charging pile end.

[0005] In order to achieve the above object, the present invention adopts the following technical scheme:

[0006] A fast charging control system of the present invention comprises:

[0007] Power battery, used to provide electrical energy;

[0008] A main negative relay, wherein a first port of the main negative relay is electrically connected to the negative electrode of the power battery, and a second port of the main negative relay is electrically connected to the negative electrode of the fast charging interface of the power battery;

[0009] a pre-charging unit, wherein a first port of the pre-charging unit is electrically connected to the positive electrode of the power battery, and is used to reduce the impact current of the power battery during the charging process;

[0010] A fast-charging relay, wherein a first port of the fast-charging relay is electrically connected to a second port of the pre-charging unit, and a second port of the fast-charging relay is electrically connected to a positive electrode of the fast-charging interface;

[0011] A battery management controller is electrically connected to the control ports of the fast charging interface, the fast charging relay and the main negative relay, respectively, and the battery management controller is configured to perform the following steps:

[0012] Acquire a charging gun insertion signal through the fast charging interface, wherein the charging gun insertion signal indicates that the charging gun of the charging column is inserted into the fast charging interface;

[0013] In response to the charging gun insertion signal, the main negative relay and the fast charging relay are controlled to be closed.

[0014] Optionally, the pre-charging unit includes:

[0015] A pre-charging relay, wherein a first port of the pre-charging relay is electrically connected to the positive electrode of the power battery;

[0016] A pre-charging resistor, wherein a first port of the pre-charging resistor is electrically connected to a second port of the pre-charging relay, and a second port of the pre-charging resistor is electrically connected to a first port of the fast-charging relay;

[0017] The battery management controller is configured to perform the following steps:

[0018] In response to the charging gun insertion signal, the main negative relay, the pre-charge relay and the fast-charge relay are controlled to be closed.

[0019] Optionally, the resistance value of the pre-charging resistor is determined by the capacitance value of the high voltage load and the target pre-charging time;

[0020] The rated power of the pre-charging resistor is determined by the capacitance value of the high-voltage load, the target pre-charging time and the voltage value of the power battery.

[0021] Optionally, the pre-charging relay is determined based on the pre-charging resistance.

[0022] Optionally, the battery management controller controls the pre-charge relay in response to the charging gun insertion signal to control the fast charge relay and the main negative relay to close before closing.

[0023] Optionally, the fast charging control system further includes a main positive relay, a first port of the main positive relay is electrically connected to the positive electrode of the power battery, and a second port of the main positive relay is electrically connected to the first port of the fast charging relay;

[0024] The battery management controller is electrically connected to the control port of the main positive relay, and the electromagnetic management controller is also configured to perform the following steps:

[0025] In response to a charging request, the main positive relay is controlled to be closed, and the pre-charging relay is controlled to be opened; wherein the charging request indicates that the charging pile starts to charge the power battery.

[0026] Optionally, the electromagnetic management controller is configured to first control the main positive relay to close and then control the pre-charge relay to open in response to a charging request.

[0027] Optionally, the battery management controller is also configured to control the main negative relay and the fast charging relay to disconnect in response to a charging completion signal.

[0028] Optionally, the battery management controller is configured to first control the main negative relay to disconnect and then control the fast charging relay to disconnect in response to a charging completion signal.

[0029] Optionally, the main negative relay is determined according to the charging and discharging peak charging current and voltage value of the power battery.

[0030] The fast charging control system provided by the present invention adds a pre-charging unit between the negative electrode of the power battery and the fast charging relay, changes the position of the fast charging relay, merges the fast charging relay and the main circuit with the pre-charging unit, obtains the charging gun insertion signal through the fast charging structure of the power battery, and the charging gun insertion signal indicates that the charging gun of the charging column is inserted into the fast charging interface. In response to the charging gun insertion signal, the main negative relay and the fast charging relay are controlled to close. Before closing the fast charging relay, the pre-charging unit will be controlled to be connected to the circuit. Even if the charging pile has an abnormal situation that the high-voltage relay is controlled to close in advance, the pressure difference on both sides of the fast charging relay is large when the fast charging relay is closed. Because of the protection of the pre-charging unit, the impact current generated in the fast charging circuit will not exceed the threshold of the fast charging relay, and the current of the entire fast charging circuit will be controlled within a safe range, and the relay will not be damaged. At the same time, the charging gun insertion signal is obtained through the fast charging structure of the power battery, that is, the main negative relay and the fast charging relay are controlled to close, thereby saving charging time and improving charging efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0032] Figure 1 This is the circuit diagram of a conventional fast charging circuit;

[0033] Figure 2 is a circuit diagram of a fast charging control system according to Embodiment 1 of the present invention;

[0034] Figure 3 is a circuit diagram of a fast charging control system according to Embodiment 2 of the present invention;

[0035] Figure 4 is a circuit diagram of a fast charging control system according to Embodiment 3 of the present invention;

[0036] Figure 5 is a flowchart of a fast charging control method according to Embodiment 3 of the present invention;

[0037] Figure 6 is a flowchart of a fast charging control method according to a fourth embodiment of the present invention;

[0038] Figure 7 is a flowchart of a fast charging control method according to Embodiment 5 of the present invention;

[0039] Figure 8 It is a block diagram of the internal structure of a vehicle according to the sixth embodiment of the present invention. DETAILED DESCRIPTION

[0040] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0041] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0042] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0043] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0044] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0045] In order to facilitate understanding of the technical solution of the present invention, the terms involved in the present invention are briefly introduced below.

[0046] 1. Power batteries are power sources for tools, mostly referring to batteries that power electric vehicles, electric trains, electric bicycles, golf carts, drones, power tools, etc. Power batteries store and release electrical energy through chemical reactions. Take lithium-ion batteries as an example. When charging, lithium ions are released from the positive electrode material (such as lithium cobalt oxide, lithium nickel cobalt manganese oxide, etc.), and go to the negative electrode (such as graphite) through the electrolyte. At the same time, electrons flow from the positive electrode to the negative electrode through the external circuit. When discharging, lithium ions are released from the negative electrode and return to the positive electrode through the electrolyte. Electrons flow from the negative electrode to the positive electrode through the external circuit to power the vehicle's motor.

[0047] 2. Main negative relay: connected between the negative pole of the fast charging interface of the power battery and the high-voltage circuit, responsible for controlling the on and off of the high-voltage circuit. When the main negative relay is closed, the negative pole of the power battery is connected to the high-voltage circuit to form a complete circuit; when the main negative relay is disconnected, the connection between the negative pole of the power battery and the high-voltage circuit is cut off.

[0048] 3. Pre-charge unit: It is closed first when the battery system is powered on or charged, creating a low current path to allow current to pass through the pre-charge unit. The purpose of this is to balance the voltage between the battery system and the external power supply or load, avoid the impact current caused by voltage mutation, and protect the circuit and battery.

[0049] 4. Fast charging relay: Provides overcurrent protection for the power battery and fast charging circuit, and realizes controlled charging of the battery pack according to the fast charging process requirements. During the charging process, the fast charging relay is responsible for connecting the battery system and the fast charging equipment, allowing high-power DC current to enter the battery to achieve fast charging.

[0050] 5. Battery Management System (BMS): It is one of the key technologies in electric vehicles, responsible for monitoring and managing the operating status of the battery pack to ensure the safe, stable and efficient operation of the battery.

[0051] Embodiment 1:

[0052] The embodiment of the present invention provides a fast charging control system. Figure 2 , which is a circuit diagram of a fast charging control system provided by an embodiment of the present invention. Figure 2As shown, the fast charging control system provided by the present invention mainly includes a power battery 201, a fast charging relay 202, a pre-charging unit 300, a main negative relay 206 and a battery management controller (not shown).

[0053] The first port of the main negative relay 206 is electrically connected to the negative electrode of the power battery 201 , and the second port of the main negative relay 206 is electrically connected to the negative electrode of the fast charging interface 208 of the power battery 201 ;

[0054] The first port of the pre-charging unit 300 is electrically connected to the positive electrode of the power battery 201 to reduce the impact current of the power battery 201 during the charging process;

[0055] The first port of the fast charge relay 202 is electrically connected to the second port of the pre-charge unit 300, and the second port of the fast charge relay 202 is electrically connected to the positive electrode of the fast charge interface 208;

[0056] The battery management controller is electrically connected to the control ports of the fast charge interface 208, the fast charge relay 202 and the main negative relay 206, respectively, and the battery management controller is configured to perform the following steps:

[0057] Obtaining a charging gun insertion signal through the fast charging interface 208, wherein the charging gun insertion signal indicates that the charging gun of the charging column is inserted into the fast charging interface 208;

[0058] In response to the charging gun insertion signal, the main negative relay 206 and the fast charge relay 202 are controlled to close.

[0059] Optionally, the first port of the main negative relay 206 is connected to the negative pole of the power battery 201, the second port of the main negative relay 206 is respectively connected to the negative pole of the vehicle fast charging interface 208 and the negative pole of the high-voltage load 207, and the control port of the main negative relay 206 is connected to the battery management controller.

[0060] In this embodiment, the high-voltage load 207 can drive a motor controller, a DC / DC converter, an air-conditioning compressor assembly, a heater and other devices, which are not specifically limited in this embodiment.

[0061] The fast charging control system of this embodiment adds a pre-charging unit 300 between the negative electrode of the power battery 201 and the fast charging relay 202, changes the position of the fast charging relay 202, merges the fast charging relay 202 and the main circuit with the pre-charging unit 300, and obtains the charging gun insertion signal through the fast charging structure of the power battery 201. The charging gun insertion signal indicates that the charging gun of the charging column is inserted into the fast charging interface 208, and controls the main negative relay 206 and the fast charging relay 202 to close in response to the charging gun insertion signal. Before closing the fast charging relay 202, the pre-charging unit 300 will be controlled to be connected to the circuit. Even if the charging pile has an abnormal situation in which the high-voltage relay is controlled to close in advance, the pressure difference on both sides of the fast charging relay is large when the fast charging relay is closed. Because of the protection of the pre-charging unit 300, the impact current generated in the fast charging circuit will not exceed the threshold of the fast charging relay 202, and the current of the entire fast charging circuit will be controlled within a safe range, and will not damage the fast charging relay 202. At the same time, the charging gun insertion signal is obtained through the fast charging structure of the power battery 201, that is, the main negative relay 206 and the fast charging relay 202 are controlled to be closed, thereby saving charging time and improving charging efficiency.

[0062] Embodiment 2:

[0063] Please refer to Figure 3 , which is a circuit diagram of a fast charging control system provided by an embodiment of the present invention. Figure 3 As shown, the fast charging control system provided by the present invention mainly includes a power battery 201, a fast charging relay 202, a pre-charging unit 300, a main negative relay 206 and a battery management controller (not shown).

[0064] The first port of the main negative relay 206 is electrically connected to the negative electrode of the power battery 201 , and the second port of the main negative relay 206 is electrically connected to the negative electrode of the fast charging interface 208 of the power battery 201 ;

[0065] The first port of the pre-charging unit 300 is electrically connected to the positive electrode of the power battery 201 to reduce the impact current of the power battery 201 during the charging process;

[0066] The first port of the fast charge relay 202 is electrically connected to the second port of the pre-charge unit 300, and the second port of the fast charge relay 202 is electrically connected to the positive electrode of the fast charge interface 208;

[0067] The battery management controller is electrically connected to the control ports of the fast charge interface 208, the fast charge relay 202 and the main negative relay 206, respectively, and the battery management controller is configured to perform the following steps:

[0068] Obtaining a charging gun insertion signal through the fast charging interface 208, wherein the charging gun insertion signal indicates that the charging gun of the charging column is inserted into the fast charging interface 208;

[0069] In response to the charging gun insertion signal, the main negative relay 206 and the fast charge relay 202 are controlled to close.

[0070] Optionally, the first port of the main negative relay 206 is connected to the negative pole of the power battery 201, the second port of the main negative relay 206 is respectively connected to the negative pole of the vehicle fast charging interface 208 and the negative pole of the high-voltage load 207, and the control port of the main negative relay 206 is connected to the battery management controller.

[0071] In this embodiment, the pre-charging unit 300 includes a pre-charging relay 203 and a pre-charging resistor 204. The first port of the pre-charging relay 203 is electrically connected to the positive electrode of the power battery 201; the first port of the pre-charging resistor 204 is electrically connected to the second port of the pre-charging relay 203, and the second port of the pre-charging resistor 204 is electrically connected to the first port of the fast charging relay 202.

[0072] The battery management controller of this embodiment is configured to perform the following steps:

[0073] In response to the charging gun insertion signal, the main negative relay 206 , the pre-charge relay 203 and the fast charge relay 202 are controlled to be closed.

[0074] The fast charging control system of this embodiment adds a pre-charging unit 300 between the negative electrode of the power battery 201 and the fast charging relay 202, changes the position of the fast charging relay 202, merges the fast charging relay 202 and the main circuit with the pre-charging relay 203 and the pre-charging resistor 204, and obtains the charging gun insertion signal through the fast charging structure of the power battery 201. The charging gun insertion signal indicates that the charging gun of the charging column is inserted into the fast charging interface 208. In response to the charging gun insertion signal, the main negative relay 206 and the fast charging relay 202 are controlled to be closed. Before closing the fast charging relay 202, the pre-charging resistor 204 will be controlled to be connected to the circuit. Even if the charging pile has an abnormal situation that the high-voltage relay is controlled to be closed in advance, the pressure difference on both sides of the fast charging relay is large when the fast charging relay is closed. Because of the protection of the pre-charging resistor 204, the impact current generated in the fast charging circuit will not exceed the threshold of the fast charging relay 202. The current of the entire fast charging circuit will be controlled within a safe range and will not damage the fast charging relay 202. At the same time, the charging gun insertion signal is obtained through the fast charging structure of the power battery 201, that is, the main negative relay 206, the pre-charging relay 203 and the fast charging relay 202 are controlled to be closed, thereby saving charging time and improving charging efficiency.

[0075] It should be noted that the present invention provides a pre-charging unit 300 at the first port of the fast charging relay 202 to reduce the impact current generated in the circuit through the pre-charging unit 300. Based on this, the way to reduce the impact current generated in the circuit is not limited to the combination of the pre-charging relay 203 and the pre-charging resistor 204. For example, a variety of electronic components and circuit structures, or capacitors, or inductors, or diodes, or thermistors, etc. can be used, which are not specifically limited here.

[0076] Continue to refer to Figure 3 , in this embodiment, the resistance value of the pre-charge resistor 204 is determined by the capacitance value of the high voltage load and the target pre-charge time;

[0077] The rated power of the pre-charging resistor 204 is determined by the capacitance value of the high voltage load, the target pre-charging time and the voltage value of the power battery.

[0078] In order to better prevent the impact current generated in the fast charging circuit from exceeding the threshold of the fast charging relay and control the current of the entire fast charging circuit within a safe range, the resistance value and rated power of the pre-charging resistor need to be selected.

[0079] Specifically, the resistance of the pre-charging resistor is determined by the capacitance value of the high-voltage load and the target pre-charging time; the rated power of the pre-charging resistor is determined by the capacitance value of the high-voltage load, the target pre-charging time and the voltage value of the power battery.

[0080] The pre-charge circuit is actually an RC circuit. Generally, the pre-charge voltage is required to reach 95% of the battery voltage. The target pre-charge time is generally within 200ms. It can be deduced that t = 3RC and E ≈ 0.5U 2 C, where t is the target pre-charge time, R is the resistance of the pre-charge resistor, C is the capacitance of the high-voltage load, E is the accumulated energy of the pre-charge resistor, and U is the voltage of the power battery.

[0081] According to t = 3RC, the resistance of the pre-charge resistor can be calculated; according to E ≈ 0.5U 2 C and P=E / t, the power P can be calculated. According to the characteristics of the pre-charging resistor, a value that is generally 5 to 10 times less than the power P is used as the rated power of the pre-charging resistor.

[0082] Optionally, the pre-fill relay 203 is determined based on the pre-fill resistor 204. When the pre-fill resistor 204 is determined, the pre-fill relay 203 can be determined.

[0083] Optionally, the battery management controller controls the pre-charge relay before the fast charge relay and the main negative relay are closed in response to the charging gun insertion signal.

[0084] Specifically, the battery management controller controls the main negative relay, the pre-charge relay, and the fast charge relay to close in sequence in response to the charging gun insertion signal.

[0085] After receiving the charging gun insertion signal, closing the main negative relay first can ensure that the negative pole of the battery system is connected to the negative pole of the charging pile, preparing for the subsequent pre-charging process. By closing the main negative relay first and then the pre-charging relay, the voltage between the power battery and the charging pile can be gradually balanced, preparing for the subsequent fast charging process, which helps to improve the stability of charging and reduce fluctuations and uncertainties during the charging process.

[0086] If the fast charge relay is closed first and then the pre-charge relay is closed, the pre-charge resistor may not play its due role, because the current has already flowed directly into the battery through the fast charge relay. Therefore, closing the pre-charge relay first and then the fast charge relay can limit the current through the pre-charge resistor, gradually balance the voltage between the battery and the charging pile, and avoid instantaneous large current shock.

[0087] Optionally, the closing time interval of the main negative relay, the pre-charging relay, and the fast-charging relay can be set to a second preset time length, such as 200ms.

[0088] In some optional embodiments, during the charging process, if the insulation performance between the high-voltage system and the vehicle chassis is insufficient, high-voltage electrical shock may occur, thereby damaging the on-board equipment, etc., and even causing the vehicle to catch fire. Furthermore, after the battery management controller controls the pre-charging relay to close, the battery management controller may perform a circuit insulation test, and after the insulation test passes, the fast charging relay is controlled to close. The insulation test mainly detects the insulation resistance between the positive and negative poles of the power battery and the vehicle body ground. Ideally, the insulation resistance of the high-voltage positive and negative poles of the battery pack to the vehicle body ground should be infinite (∞), that is, there is no risk of leakage. The battery management controller usually uses the reference resistance method for insulation testing, that is, by measuring the voltage and total voltage at different points, and using the equation to solve the insulation resistance value of the high-voltage positive and negative poles to the ground. Example three:

[0089] Reference Figure 4 , which is a circuit diagram of a fast charging control system provided by an embodiment of the present invention. Figure 4 As shown, the fast charging control system provided by the present invention mainly includes a power battery 201, a fast charging relay 202, a pre-charging unit 300, a main negative relay 206, a main positive relay 205, and a battery management controller (not shown).

[0090] The first port of the main negative relay 206 is electrically connected to the negative electrode of the power battery 201 , and the second port of the main negative relay 206 is electrically connected to the negative electrode of the fast charging interface 208 of the power battery 201 ;

[0091] The first port of the pre-charging unit 300 is electrically connected to the positive electrode of the power battery 201 to reduce the impact current of the power battery 201 during the charging process;

[0092] The first port of the fast charge relay 202 is electrically connected to the second port of the pre-charge unit 300, and the second port of the fast charge relay 202 is electrically connected to the positive electrode of the fast charge interface 208;

[0093] The first port of the main positive relay 205 is electrically connected to the positive electrode of the power battery 201 , and the second port of the main positive relay 205 is electrically connected to the first port of the fast charge relay 202 ;

[0094] The battery management controller is electrically connected to the fast charge interface 208 and the control ports of the fast charge relay 202, the main negative relay 206, and the main positive relay 205, respectively, and the battery management controller is configured to perform the following steps:

[0095] Obtaining a charging gun insertion signal through the fast charging interface 208, wherein the charging gun insertion signal indicates that the charging gun of the charging column is inserted into the fast charging interface 208;

[0096] In response to the charging gun insertion signal, the main negative relay 206 and the fast charging relay 202 are controlled to close;

[0097] In response to the charging request, the main positive relay 205 is controlled to be closed, and the pre-charging relay 203 is controlled to be opened; wherein the charging request indicates that the charging pile starts to charge the power battery 201 .

[0098] The pre-charging unit 300 includes a pre-charging relay 203 and a pre-charging resistor 204. The first port of the pre-charging relay 203 is electrically connected to the positive electrode of the power battery 201; the first port of the pre-charging resistor 204 is electrically connected to the second port of the pre-charging relay 203, and the second port of the pre-charging resistor 204 is electrically connected to the first port of the fast charging relay 202.

[0099] Specifically, the main positive relay 205 is connected between the positive electrode of the power battery 201 and the high-voltage load (such as a motor, a controller, etc.). When high voltage electricity is needed to be provided to the high-voltage load, the main positive relay 205 is closed, so that the high voltage electricity of the power battery 201 can be transmitted to the high-voltage load; when the system needs to be powered off or a fault occurs, the main positive relay 205 is disconnected, cutting off the connection between the power battery 201 and the high-voltage load to ensure the safety of the system.

[0100] In response to the charging gun insertion signal, the battery management controller sequentially controls the main negative relay 206, the pre-charge relay 203, and the fast charge relay 202 to close;

[0101] The electromagnetic management controller is configured to control the main positive relay 205 to close first and then control the pre-charge relay 203 to open in response to a charging request.

[0102] The embodiment of the present invention provides a fast charging control method applied to a fast charging control system. Figure 5 , which is a flow chart of the fast charging control method provided by an embodiment of the present invention. Figure 5 As shown, the fast charging control method provided by the present invention mainly includes the following steps (steps S501 to S503):

[0103] Step S501, before the battery management controller responds to the charging gun insertion signal, the battery management controller controls the main positive relay 205 and the main negative relay 206 to be disconnected;

[0104] Step S502, the battery management controller controls the main negative relay 206, the pre-charge relay 203, and the fast charge relay 202 to close in sequence in response to the charging gun insertion signal;

[0105] Step S503 , the electromagnetic management controller controls the main positive relay 205 to close first in response to the charging request, and then controls the pre-charging relay 203 to open.

[0106] When the charging gun of the charging pile is inserted into the vehicle's fast charging port, a physical connection is formed. The battery management controller can sense that the charging gun has been inserted through internal sensors and circuits, and confirm that the vehicle's fast charging port and the charging gun are correctly connected.

[0107] The main negative relay is mainly responsible for isolating the power battery and the main electrical equipment of the vehicle. After the new energy vehicle is turned off, the status of the main negative relay may vary from vehicle to vehicle. On the one hand, if the vehicle design allows certain devices (such as car audio, air conditioning, lighting system, etc.) to continue to operate after the engine is turned off, the main negative relay may remain closed to provide the necessary power supply. On the other hand, for safety reasons, some vehicles may set additional control logic on the main negative relay to ensure that all non-essential power supplies are disconnected after the engine is turned off.

[0108] The main positive relay is usually responsible for controlling the power output of the power battery to the vehicle-side load. In most cases, when the car is turned off and the ignition switch is turned off, the main positive relay will be disconnected to prevent the power battery from continuing to supply power to the vehicle-side load. This is to save power, protect the battery pack, and avoid potential electrical failures. However, in some special cases (such as when the vehicle is equipped with a delayed power-off function), the main positive relay may remain closed for a period of time after the engine is turned off to allow certain devices to continue to operate. In some cases, in order to save energy or protect the battery, the vehicle design may disconnect the main positive relay when the main negative relay is closed to ensure that only necessary equipment continues to operate after the engine is turned off. In other cases, the main positive relay may still remain closed to support the operation of more equipment.

[0109] It can be seen that when the vehicle is turned off, the state of the main positive relay and the main negative relay is not certain whether it is closed or disconnected. In order to unify the subsequent control strategy, the main positive relay and the main negative relay can be disconnected first.

[0110] Optionally, when the battery management controller detects that the charging gun of the charging pile is inserted into the vehicle's fast charging interface, it can delay for a first preset time, such as 500ms, and then disconnect the main positive relay and the main negative relay.

[0111] It should be noted that if the current state of the main positive relay / main negative relay is a closed state, the main positive relay / main negative relay is directly disconnected; if the current state of the main positive relay / main negative relay is a disconnected state, the battery management controller will send a disconnection command to the main positive relay / main negative relay, and the main positive relay / main negative relay will not respond to the command, or will execute the command but the state will not change.

[0112] The pins inside the charging gun contact the corresponding pins inside the vehicle's fast charging interface to form an electrical connection. The charging pile will output a current of, for example, 12V as a charging wake-up signal, which is transmitted to the vehicle's battery management controller through the charging gun. After that, the battery management controller begins initialization and prepares to enter the charging mode, such as checking the battery status, such as voltage, temperature, etc., to ensure that the battery is in a state suitable for charging. If the battery status is normal, the battery management controller will establish communication with the charging pile through the CAN bus or other communication protocols, and send a charging request carrying charging parameters to the charging pile.

[0113] The charging pile will start to output current for charging only after receiving the charging request from the battery management controller. During the charging process, the battery management controller will continuously monitor the status of the battery and adjust the charging parameters as needed.

[0114] It should be noted that the closing control of the main negative relay 206, the pre-charge relay 203 and the fast charge relay 202 needs to be performed after the opening control of the main positive relay 205 and the main negative relay 206 is executed in step S301.

[0115] Optionally, in step S503, the electromagnetic management controller first controls the main positive relay 205 to close in response to the charging request, and then controls the pre-charging relay 203 to open.

[0116] During the charging process, the main positive relay 205 is responsible for connecting the positive electrode of the power battery 201 to the positive electrode of the charging gun. Closing the main positive relay 205 first can ensure that the positive electrode connection between the battery system and the charging pile is complete, which is necessary for normal charging.

[0117] The pre-charge relay 203 limits the current during the pre-charge phase to prevent overcurrent from damaging the battery and circuit. After voltage balancing is completed, the main positive relay 205 closes to allow a larger charging current to pass. At this time, disconnecting the pre-charge relay 203 can avoid current shocks at the beginning of high-current charging. In addition, if the pre-charge relay 203 is still closed during the formal charging phase, it may interfere with the monitoring and control of the battery management controller, resulting in an unstable charging process.

[0118] Therefore, the sequence of closing the main positive relay 205 first and then disconnecting the pre-charge relay 203 can ensure that during the charging process, the positive and negative poles of the battery system are correctly connected, and the pre-charge resistor has completed its protection function and can be safely removed, thereby starting the normal charging process.

[0119] Optionally, the time interval between the closing of the main positive relay 205 and the opening of the pre-charging relay 203 can be set to a third preset time length, such as 200 ms.

[0120] Embodiment 4

[0121] refer to Figure 6 , Figure 6 Schematic diagram of a fast charging control method in an embodiment of the present invention.

[0122] like Figure 6 As shown, the method includes the following steps (steps S601 to S604):

[0123] Step S601, before the battery management controller responds to the charging gun insertion signal, the battery management controller controls the main positive relay 205 and the main negative relay 206 to be disconnected;

[0124] Step S602, the battery management controller controls the main negative relay 206, the pre-charge relay 203, and the fast charge relay 202 to close in sequence in response to the charging gun insertion signal;

[0125] Step S603, the electromagnetic management controller controls the main positive relay 205 to close in response to the charging request, and then controls the pre-charging relay 203 to open;

[0126] Step S604 , the battery management control controls the main negative relay 206 and the fast charge relay 202 to be disconnected in response to the charging completion signal.

[0127] In some optional embodiments, the battery management controller is configured to first control the main negative relay 206 to be disconnected, and then control the fast charge relay 202 to be disconnected in response to the charging completion signal.

[0128] In some optional embodiments, when the battery management controller detects that charging is completed, the battery management controller controls the main negative relay 206, the main positive relay 205 and the fast charge relay 202 to be disconnected.

[0129] During the fast charging process, the battery will receive a large amount of electrical energy. If the main positive relay is disconnected immediately after the fast charging is completed, it may cause a sudden interruption of the current, resulting in arcs or sparks, which may not only damage the relay itself, but also cause damage to the surrounding circuits and equipment.

[0130] To solve this problem, the battery management controller first controls the main negative relay 206 to disconnect, and then controls the main positive relay 205 and the fast charging relay 202 to disconnect, so that the current can be gradually reduced and the risk of current mutation can be reduced. In addition, if all relays are disconnected immediately after the fast charge is completed, the current and voltage inside the battery may change suddenly, thereby affecting the performance and life of the battery. Therefore, disconnecting the main negative relay 206 first, and then disconnecting the main positive relay 205 and the fast charging relay 202, can more smoothly reduce the current and voltage of the power battery and protect the power battery from damage.

[0131] Embodiment five:

[0132] In practical applications, the above-mentioned embodiments and preferred embodiments can be integrated according to the actual application requirements. In order to facilitate technical personnel in this field to understand how to implement the actual application and how to combine the preferred embodiments, the fast charging control method is described in detail.

[0133] For the specific implementation process, please refer to Figure 7 , Figure 7 FIG. 1 is a flow chart of a fast charging control method according to an embodiment of the present invention. Figure 7 As shown, the method includes the following steps (steps S701 to S706):

[0134] Step S701, after the battery management controller detects that the charging gun of the charging pile is inserted into the fast charging interface of the vehicle and delays for a first preset time, the battery management controller controls the main positive relay 205 and the main negative relay 206 to be disconnected;

[0135] Step S702, the battery management controller controls the main negative relay 206 and the pre-charge relay 203 to close in sequence in response to the charging gun insertion signal;

[0136] Step S703, after the battery management controller controls the pre-charge relay 205 to close, the battery management controller performs circuit insulation detection;

[0137] Step S704, after the insulation test is passed, the battery management controller controls the fast charge relay 202 to close;

[0138] Step S705, in response to the charging request, the battery management controller first controls the main positive relay 205 to close, and then controls the pre-charge relay 203 to open;

[0139] Step S706 , in response to the charging completion signal, the battery management control first controls the main negative relay 206 to be disconnected, and then controls the main positive relay 205 and the fast charge relay 202 to be disconnected.

[0140] Embodiment six:

[0141] Based on the same inventive concept, the embodiment of the present invention further provides a vehicle 600, the internal structure of the vehicle 600 is as follows: Figure 8 The vehicle 600 includes a battery management controller 601 , which includes a memory 6011 , a processor 6012 and a communication bus 6013 ; the memory 6011 and the processor 6012 are connected via the communication bus 6013 .

[0142] The memory 6011 may be used to store instructions, programs, codes, code sets or instruction sets. The memory 6011 may include a program storage area and a data storage area, wherein the program storage area may store instructions for implementing an operating system, instructions for at least one function, and instructions for implementing the fast charging control method provided in the above embodiment, etc.; the data storage area may store data involved in a fast charging control method provided in the above embodiment, etc.

[0143] The processor 6012 may include one or more processing cores. The processor 6012 executes various functions and processes data of the present invention by running or executing instructions, programs, code sets or instruction sets stored in the memory 6011, calling the data stored in the memory 6011. The processor 6012 may be at least one of an application-specific integrated circuit (ASIC), a digital signal processor (DSP), a digital signal processing device (DSPD), a programmable logic device (PLD), a field programmable gate array (FPGA), a central processing unit (CPU), a controller, a microcontroller and a microprocessor. It can be understood that for different devices, the electronic device used to implement the above-mentioned processor function can also be other, and the embodiment of the present invention is not specifically limited.

[0144] The communication bus 6013 may include a path to transmit information between the above components. The communication bus 6013 may be a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus. The communication bus 6013 may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 8 Only one double arrow is used in the diagram, but it does not mean that there is only one bus or one type of bus. Figure 8 The vehicle shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present invention.

[0145] Those skilled in the art will understand that Figure 8 The structure shown in the figure is merely a block diagram of a partial structure related to the scheme of the present invention, and does not constitute a limitation on the vehicle to which the scheme of the present invention is applied. A specific vehicle may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0146] Embodiment seven:

[0147] In particular, according to an embodiment of the present invention, the process described in the above flowchart may be implemented as a computer software program.

[0148] The technical solution of the present invention, in essence, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, that is, the embodiment of the present invention also provides a computer-readable storage medium, which includes a number of computer programs or computer instructions, which are used to enable a computer device (which can be a personal computer, server or network device, etc.) or a processor to perform all or part of the steps of the methods of various embodiments of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory, random access memory, disk or optical disk, etc., various media that can store program codes.

[0149] Embodiment eight:

[0150] An embodiment of the present invention includes a computer program product, which includes a computer program carried on a computer readable medium, the computer program including a computer program for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network, and / or installed from a removable medium. When the computer program is executed by a central processing unit (CPU), various functions defined in the present invention are performed.

[0151] Although some specific embodiments of the present invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A fast charging control system, characterized in that: include: Power battery, used to provide electrical energy; A main negative relay, wherein a first port of the main negative relay is electrically connected to the negative electrode of the power battery, and a second port of the main negative relay is electrically connected to the negative electrode of the fast charging interface of the power battery; a pre-charging unit, wherein a first port of the pre-charging unit is electrically connected to the positive electrode of the power battery, and is used to reduce the impact current of the power battery during the charging process; A fast-charging relay, wherein a first port of the fast-charging relay is electrically connected to a second port of the pre-charging unit, and a second port of the fast-charging relay is electrically connected to a positive electrode of the fast-charging interface; A battery management controller is electrically connected to the control ports of the fast charging interface, the fast charging relay and the main negative relay, respectively, and the battery management controller is configured to perform the following steps: Acquire a charging gun insertion signal through the fast charging interface, wherein the charging gun insertion signal indicates that the charging gun of the charging column is inserted into the fast charging interface; In response to the charging gun insertion signal, the main negative relay and the fast charging relay are controlled to be closed.

2. The fast charging control system according to claim 1, characterized in that: The pre-charging unit comprises: A pre-charging relay, wherein a first port of the pre-charging relay is electrically connected to the positive electrode of the power battery; A pre-charging resistor, wherein a first port of the pre-charging resistor is electrically connected to a second port of the pre-charging relay, and a second port of the pre-charging resistor is electrically connected to a first port of the fast-charging relay; The battery management controller is configured to perform the following steps: In response to the charging gun insertion signal, the main negative relay, the pre-charge relay and the fast-charge relay are controlled to be closed.

3. The fast charging control system according to claim 2, characterized in that: The resistance value of the pre-charging resistor is determined by the capacitance value of the high voltage load and the target pre-charging time; The rated power of the pre-charging resistor is determined by the capacitance value of the high-voltage load, the target pre-charging time and the voltage value of the power battery.

4. The fast charging control system according to claim 2, characterized in that: The pre-charging relay is determined based on the pre-charging resistance.

5. The fast charging control system according to claim 2, characterized in that: The battery management controller controls the pre-charge relay before controlling the fast charge relay and the main negative relay to close in response to the charging gun insertion signal.

6. The fast charging control system according to claim 1, characterized in that: The fast charging control system further includes a main positive relay, a first port of the main positive relay is electrically connected to the positive electrode of the power battery, and a second port of the main positive relay is electrically connected to the first port of the fast charging relay; The battery management controller is electrically connected to the control port of the main positive relay, and the electromagnetic management controller is also configured to perform the following steps: In response to a charging request, the main positive relay is controlled to be closed, and the pre-charging relay is controlled to be opened; wherein the charging request indicates that the charging pile starts to charge the power battery.

7. The fast charging control system according to claim 6, characterized in that: The electromagnetic management controller is configured to control the main positive relay to close first and then control the pre-charge relay to open in response to a charging request.

8. The fast charging control system according to claim 1, characterized in that: The battery management controller is further configured to control the main negative relay and the fast charge relay to be disconnected in response to a charge completion signal.

9. The fast charging control system according to claim 8, characterized in that: The battery management controller is configured to control the main negative relay to be disconnected first and then control the fast charge relay to be disconnected in response to a charging completion signal.

10. The fast charging control system according to claim 1, characterized in that: The main negative relay is determined according to the charging and discharging peak charging current and voltage value of the power battery.

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