Battery cooling system and electrical system and control method of all-in-one air conditioner

Abstract

The application discloses a battery cooling system and an electrical system and a control method of an all-in-one machine of an air conditioner. The electrical system comprises the all-in-one machine, a battery distribution unit (BDU), a power battery, a charging base and a charging gun. The BDU comprises a battery management system (BMS) and a direct-current voltage converter (DC / DC). The power battery is used for providing a high-voltage power supply for the all-in-one machine, the BDU and the DC / DC. The charging gun is used for providing a low-voltage power supply A+ for the DC / DC through coupling with the charging base in a charging process. The DC / DC is used for providing a low-voltage auxiliary power supply for the all-in-one machine and the BMS based on the high-voltage power supply and the low-voltage power supply A+. The application realizes cooling of the power battery by the all-in-one machine without opening a power supply master switch.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of battery cooling, in particular to a battery cooling system and an electrical system and control method of an all-in-one air conditioner. BACKGROUND

[0002] The battery cooling and all-in-one air conditioner is a device integrating a battery cooling system and an air conditioner. The device can simultaneously realize battery thermal management and air conditioner functions, thereby reducing the installation space of the whole vehicle and saving energy and reducing costs.

[0003] The all-in-one machine needs a set of high-voltage power supply and low-voltage auxiliary power supply provided by the outside world to maintain system work. In the prior art, the high-voltage power supply of the battery cooling and all-in-one air conditioner is connected after the pre-charging circuit of the whole vehicle, and the high-voltage power supply is generally provided by the high-voltage power distribution cabinet of the whole vehicle. Moreover, the low-voltage power supply of the battery cooling and all-in-one air conditioner is connected after the low-voltage power supply master switch of the whole vehicle.

[0004] However, when the whole vehicle is charging, the pre-charging circuit of the whole vehicle is generally not powered on, so the all-in-one machine has no high-voltage power supply input and cannot cool the power battery. At the same time, once the power supply master switch is turned off, the all-in-one machine has no low-voltage auxiliary power supply input, so the all-in-one machine cannot work during the charging process when the power supply master switch is turned off, and cannot cool the power battery. SUMMARY

[0005] The present application provides an electrical system and control method of a battery cooling system and all-in-one air conditioner, which can cool the power battery of the all-in-one machine without turning on the power supply master switch. The technical solution is as follows.

[0006] In a first aspect, an electrical system of a battery cooling system and all-in-one air conditioner is provided, which comprises the all-in-one machine, a battery distribution unit (BDU), a power battery, a charging seat and a charging gun. The BDU comprises a battery management system (BMS) and a direct current / direct current (DC / DC) converter.

[0007] The power battery is configured to provide high-voltage power supply for the all-in-one machine, the BDU and the DC / DC converter.

[0008] The charging gun is configured to provide low-voltage power supply A+ for the DC / DC converter through coupling with the charging seat during the charging process.

[0009] The DC / DC is configured to provide a low-voltage auxiliary power supply for the all-in-one machine and the BMS based on the high-voltage power supply and the low-voltage power supply A+.

[0010] In some embodiments, the BDU further comprises a first relay and a second relay.

[0011] The positive electrode of the all-in-one machine is connected to the positive electrode of the power battery through the second relay, and the negative electrode of the all-in-one machine is connected to the negative electrode of the power battery through the first relay.

[0012] The BMS is configured to control the second relay to be closed to enable the all-in-one machine to obtain the high-voltage power supply in response to the temperature of the power battery being higher than a threshold value.

[0013] In some embodiments, the BMS is further configured to control the second relay to be opened to cut off the high-voltage power supply of the all-in-one machine in response to the temperature of the power battery being lower than a threshold value.

[0014] In some embodiments, the BDU further comprises a third relay.

[0015] The positive electrode of the DC / DC is connected to the positive electrode of the power battery through the third relay, and the negative electrode of the DC / DC is connected to the negative electrode of the power battery.

[0016] The BMS is further configured to control the third relay to be closed to enable the DC / DC to obtain the high-voltage power supply in response to the charging gun starting charging, if the temperature of the power battery is higher than a threshold value during the charging process.

[0017] In some embodiments, the BMS is further configured to control the third relay to be opened to cut off the high-voltage power supply of the DC / DC in response to the charging gun ending charging.

[0018] In some embodiments, the BDU further comprises a fourth relay, and the charging seat accesses the BDU through the fourth relay.

[0019] The BMS is further configured to control the fourth relay to be closed to enable the DC / DC to obtain the low-voltage power supply A+ in response to the charging gun starting charging.

[0020] In some embodiments, the BMS is further configured to control the fourth relay to be opened to cut off charging and cut off the low-voltage power supply A+ of the DC / DC in response to the charging gun ending charging.

[0021] In some embodiments, the all-in-one machine is further configured to, if a high-voltage preparation instruction is not received, reject responding to an operation instruction for an air conditioner in the all-in-one machine, and if the high-voltage preparation instruction is received, allow responding to the operation instruction for the air conditioner in the all-in-one machine, the high-voltage preparation instruction indicating that a pre-charging circuit has been powered with high voltage.

[0022] In a second aspect, a control method of a battery cooling system and an all-in-one machine of an air conditioner is provided, including:

[0023] The DC / DC converter provides a low-voltage auxiliary power for the all-in-one machine based on a high-voltage power provided by a power battery and a low-voltage power A+ provided by a charging gun;

[0024] In response to the temperature of the power battery being higher than a threshold value, the battery management system (BMS) controls a second relay to be closed, so that the all-in-one machine obtains the high-voltage power;

[0025] The all-in-one machine runs a battery cooling system in the all-in-one machine based on the high-voltage power and the low-voltage auxiliary power, to cool the power battery.

[0026] In some embodiments, after the battery cooling system in the all-in-one machine is run, the method further includes:

[0027] If a high-voltage preparation instruction is not received, the all-in-one machine rejects responding to an operation instruction for an air conditioner in the all-in-one machine;

[0028] If the high-voltage preparation instruction is received, the all-in-one machine allows responding to the operation instruction for the air conditioner in the all-in-one machine, the high-voltage preparation instruction indicating that a pre-charging circuit has been powered with high voltage.

[0029] In some embodiments, after the battery cooling system in the all-in-one machine is run, the method further includes:

[0030] In response to the temperature of the power battery being lower than a threshold value, the BMS controls the second relay to be opened, so as to cut off the high-voltage power of the all-in-one machine.

[0031] In some embodiments, before the DC / DC converter provides a low-voltage auxiliary power for the all-in-one machine, the method further includes:

[0032] In response to the charging gun starting charging, if the temperature of the power battery is higher than a threshold value during the charging process, the BMS controls a third relay to be closed, so that the DC / DC obtains the high-voltage power.

[0033] In some embodiments, after the battery cooling system in the all-in-one machine is run, the method further includes:

[0034] In response to the charging gun ending charging, the BMS controls the third relay to be disconnected, so as to cut off the high-voltage power supply of the DC / DC.

[0035] In some embodiments, before the DC / DC provides a low-voltage auxiliary power supply for the all-in-one machine, the method further comprises:

[0036] In response to the charging gun starting charging, the BMS controls the fourth relay to be closed, so as to enable the DC / DC to obtain the low-voltage power supply A+.

[0037] In some embodiments, after the battery cooling system in the all-in-one machine is operated, the method further comprises:

[0038] In response to the charging gun ending charging, the BMS controls the fourth relay to be disconnected, so as to cut off charging and cut off the low-voltage power supply A+ of the DC / DC.

[0039] Therefore, the present application has the following beneficial effects:

[0040] In the present application, since the DC / DC in the BDU is used to provide a low-voltage power supply, the DC / DC can provide the low-voltage power supply A+ for the whole vehicle as a wake-up source in the charging process without turning on the main power switch, and work by using the high-voltage power supply provided by the power battery, so as to convert the high-voltage power supply of the power battery into 24V voltage, charge the battery management system, and use the battery cooling and air conditioning all-in-one machine as an auxiliary power supply. Therefore, the source of the high-voltage power supply and the low-voltage auxiliary power supply of the all-in-one machine system is changed, so that battery charging and battery cooling can be realized without turning on the main power switch. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 is a flow chart of a control method of a battery cooling system and an air conditioning all-in-one machine provided by an embodiment of the present application;

[0042] Figure 2 is an electrical architecture schematic diagram provided by an embodiment of the present application;

[0043] Figure 3 is a flow chart of a control method of a battery cooling system and an air conditioning all-in-one machine provided by an embodiment of the present application. DETAILED DESCRIPTION

[0044] The current electric bus includes pure electric, hybrid, fuel cell and other buses, which are respectively provided with a battery cooling system and an air conditioner. The battery cooling system is used to cool the battery cells when the temperature of the battery cells is increased to a certain threshold, so as to reduce the risk of thermal runaway of the battery and improve the safety performance of the power battery. The air conditioning system is used to cool the driver and passenger area. The battery cooling system and the air conditioning system are generally two independent parts or systems.

[0045] In the battery cooling and air conditioning all-in-one machine, the battery thermal management and the air conditioner are integrated into an all-in-one machine, which can realize the functions of battery thermal management and air conditioning at the same time, not only reducing the installation space of the whole vehicle, but also saving energy and reducing cost.

[0046] The battery cooling and air conditioning all-in-one machine is generally a high-voltage device, which uses the high voltage on the new energy vehicle as the energy source. The high voltage system of the new energy bus is generally 450-750VDC. At the same time, a low-voltage power supply system is also needed to assist the work, and the low-voltage system of the new energy bus is generally 24V, which is provided by the low-voltage storage battery. The all-in-one machine needs to be provided with a set of high-voltage power supply and low-voltage auxiliary power supply to maintain the system work.

[0047] The high-voltage power supply of the battery cooling and air conditioning all-in-one machine is connected after the pre-charging circuit of the whole vehicle, which is generally provided by the high-voltage power distribution cabinet of the whole vehicle. This results in that the all-in-one machine must be powered on the pre-charging circuit to obtain the high-voltage power supply, that is, only after the pre-charging power-on, the all-in-one machine has the high-voltage power supply. If the all-in-one machine needs to work and cool the power battery when the whole vehicle is charging, the main circuit of the whole vehicle needs to be powered on in addition to the charging circuit, and most of the loads of the whole vehicle are powered on with high voltage. The whole vehicle has high voltage in many parts, such as motor controller, steering motor controller, etc. From the safety of high-voltage power supply, this method has certain safety hazards.

[0048] For the low-voltage power supply of the battery cooling and air conditioner all-in-one machine, the low-voltage power supply of the all-in-one machine is usually connected after the low-voltage power supply master switch of the whole vehicle. Only when the power supply master switch is turned on, the battery cooling and air conditioner all-in-one machine has low-voltage power supply input and has the preliminary condition for work. However, when this way is adopted, many bus companies require that the whole vehicle should be able to charge even if the low-voltage power supply master switch is turned off, because the charging of the whole vehicle is usually performed at night. If the large gate is opened for charging, no one will turn off the large gate in time after the charging is completed, and the static current of the whole vehicle part is consumed. If the time is long enough, the static current will cause the battery to be discharged. If the battery can be charged without opening the large gate, the static current of the whole vehicle is very small after the battery is charged, and the battery will not be discharged. Turning off the power supply master switch means that the battery cooling and air conditioner all-in-one machine has no low-voltage power supply input, so the all-in-one machine cannot work during the charging process with the power supply master switch turned off, and the cooling system cannot cool the power battery. Therefore, the electrical architecture has certain defects.

[0049] Therefore, in some embodiments of the present application, by changing the position of the battery cooling and air conditioner all-in-one machine in the electrical architecture, a new electrical architecture is proposed, the source of high-voltage power supply and low-voltage power supply of the all-in-one machine is changed, and the cooling system of the all-in-one machine can work to cool the battery during the battery plug-in charging without opening the power supply master switch, thereby solving the problem that the all-in-one machine cannot work during the charging process with the power supply master switch turned off.

[0050] In addition, during the working process of the cooling system of the all-in-one machine, the air conditioner does not work, which prevents the air conditioner from being turned on by mistake during the charging process. That is to say, although the all-in-one machine is integrated with the cooling system and the air conditioner, under the electrical architecture designed in the embodiment, precise control and interlocking protection can be achieved, and the functions of the cooling system and the air conditioner can be started when needed.

[0051] The electrical architecture provided by the embodiment of the present application is described below.

[0052] The electrical system of the battery cooling system and the air conditioner all-in-one machine provided by the embodiment of the present application includes the all-in-one machine, a battery distribution unit (BDU), a power battery, a charging seat and a charging gun. The BDU includes a battery management system (BMS) and a direct current voltage converter (DC / DC);

[0053] The power battery is used to provide high-voltage power supply for the all-in-one machine, the BDU and the DC / DC;

[0054] The charging gun is used to provide low-voltage power supply A+ for the DC / DC through coupling with the charging seat during the charging process;

[0055] The DC / DC is used to provide low-voltage auxiliary power supply for the all-in-one machine and the BMS based on the high-voltage power supply and the low-voltage power supply A+.

[0056] The method provided by the embodiment changes the source of the high-voltage power supply and the low-voltage auxiliary power supply of the all-in-one machine system, and can realize battery charging and battery cooling without turning on the main power switch.

[0057] In some embodiments, the BDU further comprises a first relay and a second relay;

[0058] The positive electrode of the all-in-one machine is connected to the positive electrode of the power battery through the second relay, and the negative electrode of the all-in-one machine is connected to the negative electrode of the power battery through the first relay;

[0059] The BMS is configured to control the second relay to be closed to enable the all-in-one machine to obtain the high-voltage power supply in response to the temperature of the power battery being higher than a threshold value.

[0060] In some embodiments, the BMS is further configured to control the second relay to be opened to cut off the high-voltage power supply of the all-in-one machine in response to the temperature of the power battery being lower than the threshold value.

[0061] In some embodiments, the BDU further comprises a third relay;

[0062] The positive electrode of the DC / DC is connected to the positive electrode of the power battery through the third relay, and the negative electrode of the DC / DC is connected to the negative electrode of the power battery;

[0063] The BMS is further configured to control the third relay to be closed to enable the DC / DC to obtain the high-voltage power supply in response to the charging gun starting charging, if the temperature of the power battery is higher than the threshold value during the charging process.

[0064] The first relay functions as a main circuit negative contactor. The second relay is a relay for the all-in-one machine. The third relay is a relay for the operation of the DC / DC, and these relays function as switches in the circuit, and the closing and opening of the relays are controlled by the BMS.

[0065] In some embodiments, the BMS is further configured to control the third relay to be opened to cut off the high-voltage power supply of the DC / DC in response to the charging gun ending charging.

[0066] In some embodiments, the BDU further comprises a fourth relay, and the charging seat is connected to the BDU through the fourth relay;

[0067] The BMS is further configured to control the fourth relay to close in response to the charging gun starting charging, so that the DC / DC obtains the low-voltage power supply A+.

[0068] In some embodiments, the BMS is further configured to control the fourth relay to open in response to the charging gun ending charging, so as to cut off the charging and cut off the low-voltage power supply A+ of the DC / DC.

[0069] In some embodiments, the all-in-one machine is further configured to refuse to respond to a working instruction for an air conditioner in the all-in-one machine if a high-voltage preparation instruction is not received, and allow the working instruction for the air conditioner in the all-in-one machine if the high-voltage preparation instruction is received, the high-voltage preparation instruction indicating that the pre-charging circuit has been charged to high voltage.

[0070] The method flow of the embodiment of the application is described below.

[0071] The control method of the battery cooling system and the all-in-one machine of the air conditioner provided by the embodiment of the application is shown in the flowchart. Figure 1 The method shown in the flowchart comprises the following steps S101 to S103. Figure 1

[0072] In step S101, the DC / DC provides a low-voltage auxiliary power supply for the all-in-one machine based on a high-voltage power supply provided by the power battery and a low-voltage power supply A+ provided by the charging gun;

[0073] In step S102, the BMS controls the second relay to close in response to the temperature of the power battery being higher than a threshold value, so that the all-in-one machine obtains the high-voltage power supply;

[0074] In step S103, the all-in-one machine runs a battery cooling system in the all-in-one machine based on the high-voltage power supply and the low-voltage auxiliary power supply, to cool the power battery.

[0075] In some embodiments, after the battery cooling system in the all-in-one machine is run, the method further comprises:

[0076] If a high-voltage preparation instruction is not received, the all-in-one machine refuses to respond to a working instruction for an air conditioner in the all-in-one machine;

[0077] If the high-voltage preparation instruction is received, the all-in-one machine allows the working instruction for the air conditioner in the all-in-one machine, the high-voltage preparation instruction indicating that the pre-charging circuit has been charged to high voltage.

[0078] In some embodiments, after the battery cooling system in the all-in-one machine is run, the method further comprises:

[0079] In response to the temperature of the power battery being lower than a threshold value, the BMS controls the second relay to open, so as to cut off the high-voltage power supply of the all-in-one machine.

[0080] ​In some embodiments, before the DC / DC provides the low-voltage auxiliary power for the all-in-one machine, the method further comprises:

[0081] In response to the charging gun starting charging, if the temperature of the power battery during the charging process is higher than the threshold value, the BMS controls the third relay to be closed, so that the DC / DC obtains the high-voltage power supply.

[0082] In some embodiments, after the battery cooling system in the all-in-one machine is run, the method further comprises:

[0083] In response to the charging gun ending charging, the BMS controls the third relay to be disconnected, so as to cut off the high-voltage power supply of the DC / DC.

[0084] In some embodiments, before the DC / DC provides the low-voltage auxiliary power for the all-in-one machine, the method further comprises:

[0085] In response to the charging gun starting charging, the BMS controls the fourth relay to be closed, so that the DC / DC obtains the low-voltage power supply A+.

[0086] In some embodiments, after the battery cooling system in the all-in-one machine is run, the method further comprises:

[0087] In response to the charging gun ending charging, the BMS controls the fourth relay to be disconnected, so as to cut off the charging and cut off the low-voltage power supply A+ of the DC / DC.

[0088] The above embodiments are illustrated below in combination with an example.

[0089] The relay KM1 in the following example is an example of the first relay in the above embodiments, the relay KM2 in the following example is an example of the second relay in the above embodiments, the relay KM3 in the following example is an example of the third relay in the above embodiments, the relay KM4 in the following example is an example of the fourth relay in the above embodiments, and the ready instruction in the following example is an example of the high-voltage preparation instruction in the above embodiments.

[0090] The following example is an example of the above embodiments. Figure 2 is a schematic diagram of an electrical architecture provided by the embodiments of the present application, as shown in the following figure: Figure 2 The electrical architecture includes a power battery 11, a BDU 12, a battery cooling and air conditioning all-in-one machine 13, a charging seat 14, and a vehicle power system load circuit 15.

[0091] The BDU 12 includes a DC / DC 121, a BMS 122, a relay KM1, a relay KM2, a relay KM3, and a relay KM4.

[0092] The vehicle power system load circuit 15 includes pre-charging and power distribution 151, modules and controllers 152, and drive motors and other loads 153.

[0093] As attached Figure 2 As shown, the vehicle's pre-charging circuit connects the positive terminal of the battery cooling and air conditioning integrated unit 13 to the BDU 12 via relay KM2, and directly connects the negative terminal of the battery cooling and air conditioning integrated unit 13 to the negative terminal of the vehicle's battery system. The BMS 122 controls the activation and deactivation of relay KM2, eliminating the constraints of the vehicle's pre-charging circuit. Even when the pre-charging circuit is powered off, the BMS 122 can determine whether the battery cooling system in the integrated unit 13 needs to operate based on whether the temperature of the power battery 11 exceeds a threshold. The BMS 122 independently controls the activation of relay KM2, enabling the integrated unit 13 to receive high-voltage power. Optionally, the temperature threshold can be set by the BMS 122.

[0094] The DC / DC 121 built into the BDU 12 is used to provide a low-voltage power supply. Without turning on the main power switch, the DC / DC 121 can use the low-voltage power supply A+ provided by the charging gun to the entire vehicle as a wake-up source during the charging process, and use the high-voltage input power provided by the power battery 11 to work, converting the high voltage of the power battery 11 into a 24V voltage, which is used to charge the BMS 122 and the battery cooling and air-conditioning integrated unit 13 as an auxiliary power supply. Among them, the current upper limit of the low-voltage power supply A+ is 2A, and the A+ current of the low-voltage power supply A+ is relatively small, and it cannot be directly provided as a power supply to the BMS 122 and the integrated unit 13. The low-voltage auxiliary power required by the BMS 122 and the integrated unit 13 is about 10A. Through the above electrical architecture, the source of the high-voltage power supply and low-voltage auxiliary power supply of the integrated unit 13 is changed, that is, the usage sequence of this function is changed.

[0095] This embodiment realizes battery charging without turning on the main power switch, and the all-in-one device specifically realizes the method flow of battery cooling, such as Figure 3 As shown, the process of the method includes the following S301 to S307.

[0096] S301, the charging gun starts to be plugged in and charged, and the BMS closes the relevant charging circuit relay. During this process, the charging gun is coupled with the charging base and inputs the low-voltage power supply A+24V and current 2A to the vehicle.

[0097] The output voltage and current of the low-voltage power supply A+ are specified by the national charging standard "GB18487.1-2015 Electric Vehicle Conductive Charging System Part 1: General Requirements".

[0098] The low-voltage power supply A+ output wakes up the BDU's built-in DC / DC converter and provides low-voltage auxiliary power to the DC / DC. This DC / DC converter requires less power, which A+ can provide. Simultaneously, the BMS closes the DC / DC's relay KM3, allowing the DC / DC converter to receive high-voltage power.

[0099] S302, after DC / DC obtains high-voltage power supply and low-voltage power supply, DC / DC can normally output 24V low-voltage auxiliary power supply, and provides for BMS and all-in-one machine.

[0100] S303, during the charging process, the battery temperature rises, and the all-in-one machine needs to start the battery cooling function. BMS sends a working request of the battery cooling system to the all-in-one machine on the bus. At the same time, BMS controls the closing of relay KM2, and provides high voltage of the power battery to the all-in-one machine. The all-in-one machine obtains high-voltage power supply and low-voltage auxiliary power supply, and can start the cooling system to cool the battery.

[0101] S304, during the working process of the cooling system, the all-in-one machine judges whether the "ready" instruction of the high-voltage of the whole vehicle pre-charging loop is received on the bus. If not, it is indicated that the high-voltage of the whole vehicle pre-charging main loop is not turned on, and the all-in-one machine can forcibly not respond to the working instruction of the air conditioner. Then, even if the air conditioner power panel is misoperated, the air conditioner cannot be started, thereby cutting off the possibility of misoperation of the air conditioner. If the air conditioner really needs to be turned on, the high-voltage flow can be normally turned on through the ignition key, at this time, the whole vehicle can send the "ready" instruction, and the all-in-one machine can respond to the instruction of the working air conditioner, so that the air conditioner can work normally. The cooling system and the air conditioner can be accurately controlled and interlocked.

[0102] S305, when the battery cooling is within the threshold temperature designed, BMS sends an instruction of stopping working of the all-in-one machine, BMS disconnects relay KM2, and cuts off the high-voltage power supply of the all-in-one machine. The cooling system stops working. Otherwise, the cooling system continues to work. The charging process can continue.

[0103] S306, BMS judges whether the charging is completed, if yes, controls to disconnect the charging KM4 relay and the relay KM3 of DC / DC. At the same time, after the charging is completed, the low-voltage power supply A+ is also cut off. Therefore, DC / DC no longer provides 24V low-voltage auxiliary power supply to BMS and the all-in-one machine.

[0104] S307, BMS and the all-in-one machine have no high-voltage power supply and low-voltage power supply, and BMS and the all-in-one machine enter the sleep state.

[0105] In summary, by the method provided in the above examples, the all-in-one machine system can realize battery cooling function without turning on the main power switch of the vehicle. The commonly used electrical architecture in the market cannot realize battery cooling during charging, or cannot realize battery cooling function when the main power switch of the vehicle is not turned on. Only when the main power switch is turned on for charging, the battery system cooling function can be realized. In this case, after charging is completed, if no one turns off the main power switch in time, the parts of the vehicle without hibernation function will continue to consume the battery power, and if the time is long, the battery health will decrease sharply, and the battery will easily run out of power. The control method and timing of the all-in-one machine system to cool the battery without turning on the main power switch in the above examples ensure that the battery does not run out of power after charging.

[0106] In addition, the electrical architecture is safer, more reliable and reasonable. During vehicle charging, the vehicle pre-charging main circuit does not carry high voltage at all, only the necessary battery system and all-in-one machine carry high voltage. The systems such as vehicle pre-charging circuit that need to participate in charging do not carry high voltage at all, and the architecture is safer and more reasonable. If a person mistakenly touches this part of the system during charging, there is no risk of electric shock.

[0107] In addition, the battery cooling and air conditioning all-in-one machine realize precise control, and in the case of charging without turning on the main power switch, the air conditioner can be interlocked to make the air conditioner forcibly unable to be turned on. It is ensured that the air conditioner will not be mistakenly turned on and consume battery power during charging.

[0108] In addition, without increasing the cost of the vehicle, the existing parts and functions of the vehicle can be used to realize the above scheme.

[0109] Each of the embodiments in the specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment mainly describes the difference from other embodiments.

[0110] A refers to B, which means that A is the same as B or a simple transformation of B.

[0111] The terms "first" and "second" and the like in the specification and claims of the embodiments of the present application are used to distinguish different objects, and are not used to describe a specific order of the objects, and cannot be understood as indicating or implying relative importance. For example, the first relay and the second relay are used to distinguish different relays, and are not used to describe a specific order of the relays, and cannot be understood as the first relay being more important than the second relay.

[0112] The above-described embodiments can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented by software, the embodiments can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are wholly or partially generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions can be transferred from one website, computer, server or data center to another website, computer, server or data center through wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) manner. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. integrated with one or more available media. The available media can be magnetic media (for example, floppy disk, hard disk, magnetic tape), optical media (for example, DVD), or semiconductor media (for example, solid state disk (SSD)) and the like.

[0113] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An all-in-one machine of a battery cooling system and an air conditioner electrical system, characterized in that, The electrical system comprises the all-in-one machine, a battery distribution unit (BDU), a power battery, a charging base and a charging gun, the BDU comprises a battery management system (BMS), a direct current voltage converter (DC / DC), a first relay, a second relay, a third relay and a fourth relay, the positive pole of the all-in-one machine is connected with the positive pole of the power battery through the second relay, the negative pole of the all-in-one machine is connected with the negative pole of the power battery through the first relay, the positive pole of the DC / DC is connected with the positive pole of the power battery through the third relay, the negative pole of the DC / DC is connected with the negative pole of the power battery, the charging base is connected with the BDU through the fourth relay, and the all-in-one machine comprises a battery cooling system and an air conditioner; The power battery is used for providing high-voltage power supply for the all-in-one machine, the BDU and the DC / DC; The charging gun is used for providing low-voltage power supply A+ for the DC / DC through coupling with the charging base during charging; The BMS is used for controlling the fourth relay to be closed to enable the DC / DC to obtain the low-voltage power supply A+ in response to the charging gun starting charging, and controlling the third relay to be closed to enable the DC / DC to obtain the high-voltage power supply if the temperature of the power battery is higher than a threshold during charging; The DC / DC is used for providing low-voltage auxiliary power supply for the all-in-one machine and the BMS based on the high-voltage power supply and the low-voltage power supply A+; The BMS is further used for controlling the second relay to be closed to enable the all-in-one machine to obtain the high-voltage power supply in response to the temperature of the power battery being higher than a threshold, and controlling the second relay to be disconnected to cut off the high-voltage power supply of the all-in-one machine in response to the temperature of the power battery being lower than the threshold; The all-in-one machine is used for running the battery cooling system in the all-in-one machine to cool the power battery based on the high-voltage power supply and the low-voltage auxiliary power supply, rejecting to respond to a working instruction for the air conditioner in the all-in-one machine if a high-voltage preparation instruction is not received, and allowing to respond to the working instruction for the air conditioner in the all-in-one machine if the high-voltage preparation instruction is received, the high-voltage preparation instruction indicating that a pre-charging circuit is on high-voltage power.

2. The system according to claim 1, wherein The BMS is further used for controlling the third relay to be disconnected to cut off the high-voltage power supply of the DC / DC in response to the charging gun ending charging.

3. The system of claim 1, wherein, The BMS is further used for controlling the fourth relay to be disconnected to cut off charging and cut off the low-voltage power supply A+ of the DC / DC in response to the charging gun ending charging.

4. A control method of a battery cooling system and an all-in-one air conditioner, characterized by, The application is applied to the electrical system in any one of claims 1 to 3, comprising: A battery management system (BMS) is used for controlling a fourth relay to be closed to enable a direct current voltage converter (DC / DC) to obtain low-voltage power supply A+ in response to a charging gun starting charging, and controlling a third relay to be closed to enable the DC / DC to obtain high-voltage power supply if the temperature of a power battery is higher than a threshold during charging. The DC / DC provides a low-voltage auxiliary power for the all-in-one machine based on a high-voltage power provided by the power battery and a low-voltage power A+ provided by the charging gun; In response to the temperature of the power battery being higher than a threshold value, the BMS controls a second relay to be closed, so that the all-in-one machine obtains the high-voltage power; The all-in-one machine runs a battery cooling system in the all-in-one machine based on the high-voltage power and the low-voltage auxiliary power, to cool the power battery; If the high-voltage preparation instruction is not received, the all-in-one machine refuses to respond to a working instruction for an air conditioner in the all-in-one machine; If the high-voltage preparation instruction is received, the all-in-one machine allows to respond to the working instruction for the air conditioner in the all-in-one machine, the high-voltage preparation instruction indicating that a pre-charging circuit has been charged to a high-voltage power; In response to the temperature of the power battery being lower than the threshold value, the BMS controls the second relay to be opened, to cut off the high-voltage power of the all-in-one machine.

5. The method of claim 4, wherein, After the running of the battery cooling system in the all-in-one machine, the method further comprises: In response to the charging gun ending charging, the BMS controls the third relay to be opened, to cut off the high-voltage power of the DC / DC.

6. The method of claim 4, wherein, After the running of the battery cooling system in the all-in-one machine, the method further comprises: In response to the charging gun ending charging, the BMS controls the fourth relay to be opened, to cut off charging and to cut off the low-voltage power A+ of the DC / DC.

Images