Vehicle-mounted power battery pulse heating high-voltage system and automobile

Abstract

The utility model discloses a vehicle-mounted power battery pulse heating high-voltage system and an automobile. The system comprises a battery module BAT1, a battery module BAT2, a switch K1, a switch K4, a switch K5, a switch K6, a switch K7 and a switch K9. The negative electrode of the battery module BAT1 is connected to the positive electrode of the battery module BAT2 through the switch K1; the positive electrode of the battery module BAT1 is led out of a terminal A-0 through a switch K4; the terminal A-0 is connected to the positive electrode of the battery module BAT2 through a switch K9 and a switch K5 which are sequentially connected in series; a terminal B-0 is led out between the switch K5 and the switch K9; a terminal C-0 is led out of the battery module BAT2 through a switch K6; the terminal A-0, the terminal B-0 and the terminal C-0 are all connected to a driving module of the motor controller, and the output end of a control module of the motor controller is connected to the switches K1, K4, K5, K6, K7 and K9 and the driving module. The battery system architecture is improved to realize self-heating of the battery pack, so that the cost generated by battery heating is reduced, and meanwhile, the space in the battery pack is saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile battery, especially relates to a vehicle-mounted power battery pulse heating high pressure architecture and automobile. BACKGROUND

[0002] With the development of new energy vehicles, in order to solve the problem that the use performance of low temperature battery is limited, the battery system needs to be heated. New energy vehicles are developing in many directions such as high series and parallel connection number high voltage fast charging, whole pack battery replacement system, etc. Among them, the problem of integrating multiple systems to improve the low temperature performance of the battery is faced.

[0003] The conventional heating method of the prior art is to increase the heating assembly, such as the battery heating assembly and the battery heating system provided in the patent application No. 201920030289.X. When the PTC heater is needed to heat the battery to be heated, the battery management system BMS controls the PTC heater to heat the battery to be heated. In the heating process, the first temperature control switch and the second temperature control switch can respectively collect the temperature value of the high voltage loop of the PTC heater and the temperature value of the low voltage control loop, and control the PTC heater to be powered or lose power according to the collected temperature value, so as to control the PTC heater to heat or stop heating the battery to be heated, realize temperature controllable, at the same time, the fan always runs in the process of PTC heater power on or power off, ensures that the temperature in the box where the battery to be heated is placed is uniformly maintained in a certain range, and the whole achieves the effect of constant temperature regulation.

[0004] The above-mentioned patent discloses that the battery assembly can effectively heat the battery and avoid damage to the battery caused by low temperature, but it needs to add PTC heater and other components, which increases the cost and occupies the space in the battery pack. Utility model content

[0005] The utility model aims at overcoming the defects of prior art, and provides a vehicle-mounted power battery pulse heating high pressure architecture and automobile, which improves the battery system architecture to realize self-heating of the battery pack, reduces the cost generated by battery heating, and saves the space in the battery pack.

[0006] In order to achieve the above object, the technical scheme adopted by the present application is: a vehicle-mounted power battery pulse heating high-voltage system, the system comprises battery modules BAT1, BAT2 and switches K1, K4, K5, K6, K7, K9; the negative electrode of the battery module BAT1 is connected to the positive electrode of the battery module BAT2 through the switch K1; the positive electrode of the battery module BAT1 is led out through the switch K4 terminal A-0; the terminal A-0 is connected to the positive electrode of the battery module BAT2 after passing through the switches K9 and K5 in sequence; the terminal B-0 is led out between the switches K5 and K9; the battery module BAT2 leads out the terminal C-0 through the switch K6; the terminals A-0, B-0 and C-0 are all connected to the driving module of the motor controller, and the output end of the control module of the motor controller is connected to the switches K1, K4, K5, K6, K7 and K9 and the driving module respectively.

[0007] The battery modules BAT1 and BAT2 are battery modules with the same number of series and parallel cells.

[0008] A fuse is arranged between the battery module BAT1 and the switch K4 and between the battery module BAT2 and the switch K6.

[0009] A pre-charging unit is arranged in parallel across the switch K4, and the pre-charging unit comprises a switch K3 and a resistor R1 connected in series.

[0010] The system further comprises switches K2 and K8; the positive electrode of the battery module BAT1 leads out the fast-charging positive electrode D-0 after passing through the fuse and the switch K2; the terminal led out between the switch K6 and the terminal C-0 leads out the fast-charging negative electrode E-0 through the switch K8.

[0011] A shunt S1 is arranged in series between the switch K6 and the terminal C-0.

[0012] The driving module of the motor controller comprises a bridge inverter, and the bridge inverter has two positive electrodes and one negative electrode, wherein the negative electrode is connected to C-0; the two positive electrodes are connected to A-0 and B-0 respectively.

[0013] The input end of the control module of the motor controller receives the control signal of the whole vehicle controller to realize the pulse heating or power output function.

[0014] An electric vehicle, which comprises the vehicle-mounted power battery pulse heating high-voltage system.

[0015] The present application has the advantages that: the battery system architecture is improved to realize self-heating of the battery pack, the cost generated by battery heating is reduced, the space in the battery pack is saved, and the space saved in the same battery pack volume can be used to increase the number of cells or other electrical components. The present application has a simple structure, and the cost is low and the implementation is convenient compared with the prior art.BRIEF DESCRIPTION OF DRAWINGS BRIEF DESCRIPTION OF DRAWINGS

[0016] The following is a brief description of the content expressed by each figure of the drawings of the present application and the marks in the figures:

[0017] Figure 1 It is an internal architecture schematic diagram of the battery system assembly of the present application;

[0018] Figure 2 It is an external connection schematic diagram of the battery system assembly of the present application. DETAILED DESCRIPTION

[0019] The specific embodiments of the present application are further described in detail below with reference to the drawings, by describing the optimal embodiments.

[0020] The present scheme re-designs the internal electrical system of the battery pack, so that it has the self-heating function in the battery pack, and only needs to increase a plurality of switches and control the switches.

[0021] As shown in Figure 1 , 2 It is an electrical diagram of a vehicle-mounted power battery pulse heating high-voltage system of the present application, and the system includes battery modules BAT1 and BAT2, and switches K1, K4, K5, K6, K7, and K9. The negative electrode of the battery module BAT1 is connected to the positive electrode of the battery module BAT2 through the switch K1. The positive electrode of the battery module BAT1 is led out through the switch K4 to a terminal A-0. The terminal A-0 is connected to the positive electrode of the battery module BAT2 after passing through the switches K9 and K5 in series. A terminal B-0 is led out between the switches K5 and K9. The battery module BAT2 leads out a terminal C-0 through the switch K6. The terminals A-0, B-0, and C-0 are all connected to the drive module of the motor controller. The control module output end of the motor controller is connected to the switches K1, K4, K5, K6, K7, K9, and the drive module, respectively. Among them, the battery modules BAT1 and BAT2 are battery modules with the same number of series and parallel cells. A fuse is arranged between the battery module BAT1 and the switch K4, and between the battery module BAT2 and the switch K6. A pre-charging unit is arranged in parallel across the switch K4, and the pre-charging unit includes a switch K3 and a resistor R1 connected in series.

[0022] The system also includes switches K2 and K8. The positive electrode of the battery module BAT1 is led out through the fuse and the switch K2 to a fast-charging positive electrode D-0. A terminal led out between the switch K6 and the terminal C-0 is led out to a fast-charging negative electrode E-0 through the switch K8, which is used to achieve the purpose of fast charging. A shunt S1 is arranged in series between the switch K6 and the terminal C-0.

[0023] The above switches K1-K9 are all electronic switches, which can be realized by using a switch tube, a relay, etc.

[0024] The drive module of the motor controller includes a bridge inverter, which has two positive poles and one negative pole, wherein the negative pole is connected to C-0; the two positive poles are connected to A-0 and B-0 respectively. As shown in Figure 2 The bridge inverter is used to generate three-phase alternating current to power the motor, which includes capacitors C1, C2 and MOS tubes Q1-Q6. Q1 and Q2, Q3 and Q4, Q5 and Q6 form a bridge arm respectively, and the negative poles of the three bridge arms are connected together to form a negative pole C-1, which is used to connect to terminal C-0. The positive poles of Q3 and Q4 and Q5 and Q6 are connected together to form terminal A-1, which is used to connect to terminal A-0; the positive pole of Q1 and Q2 is connected to terminal B-1, which is used to connect to terminal B-0. Capacitor C1 is connected in series between A-1 and C-1 terminals, and capacitor C2 is provided between B-1 and C-1 terminals. The three bridge arms respectively lead out three-phase ABC output terminals connected to the three-phase motor.

[0025] After the above system architecture is built, the working state of the control switches K1-K9 and the drive modules Q1-Q6 can be controlled to realize normal power supply to the motor and heating of the battery pack in the case of heating. The specific principle is introduced as follows:

[0026] This patent effectively solves the heating efficiency of single battery pack dual module or whole pack exchange dual pack low temperature pulse mutual charging. The high voltage architecture can realize 400V and 800V platform compatibility to meet the high voltage fast charging transition scheme, effectively utilize the existing charging facilities, and solve the problem of low temperature improvement of battery performance.

[0027] A kind of vehicle-mounted power battery pulse heating high voltage architecture system includes contactor [K1...K9], shunt [S1], fuse [FUS1, FUS2], battery system assembly

[001] , minimum battery system [BAT1, BAT2], control module

[002] , motor

[003] . The minimum system of the module BAT1 and BAT2 must be the same in series and parallel number.

[0028] K2, K8: fast charging circuit positive and negative contactors

[0029] K4, K6: main circuit positive and negative contactors

[0030] K3: pre-charging circuit contactor

[0031] K1, K5, K7, K9: auxiliary contactors

[0032] Implementation case:

[0033] If the whole vehicle is implemented as an 800V high voltage system:

[0034] Driving power supply: The vehicle controller determines the working mode according to the vehicle configuration, sends the corresponding instruction, and controls the battery management system to close K1 / K9 in the battery system assembly

[001] in priority, and K2, K5, K8 are closed by default. The BAT1+BAT2 series meets the battery matching 800V system platform voltage working mode of the vehicle. At this time, the battery management system controls K3, K4, K6 to be closed according to the vehicle control logic, and the motor control module realizes normal driving power supply to the control module

[002] and the motor

[003] .

[0035] If the vehicle is a 400V high-voltage system:

[0036] The vehicle controller determines the working mode according to the vehicle configuration, sends the corresponding instruction, and controls the battery management system to close K1, K2, K8 in the battery system assembly

[001] by default. The BAT1+BAT2 parallel battery matching 400V system platform voltage working mode of the vehicle is realized. At this time, the battery management system controls K3, K4, K6, K7 to be closed according to the vehicle control logic, and the motor control module realizes normal driving power supply to the control module

[002] and the motor

[003] .

[0037] High-voltage fast charging function:

[0038] When the vehicle detects that the charging pile is an 800V direct current system, the battery system

[001] is implemented under the control of the vehicle 800V high-voltage system, K1 / K9 is closed in priority to ensure that BAT1+BAT2 series battery matches the 800V system platform voltage of the vehicle. Execute the fast charging strategy to close K2, K8, realize the connection of D-0, E-0 points and charging loop. The control module is disabled during charging.

[0039] When the vehicle detects that the charging pile is a 400V direct current system, the battery system

[001] is implemented under the control of the vehicle 400V high-voltage system, and K1, K2, K8 are closed by default. K3, K4, K6, K7 are closed according to the vehicle logic to realize normal driving power supply to the control module

[002] and the motor

[003] . The control module is disabled during charging.

[0040] Battery pulse heating:

[0041] First loop: The vehicle controller determines the working mode according to the vehicle configuration, sends the corresponding instruction, and controls the battery management system to close K4, K7 and the battery unit BAT1 to form the first battery system loop according to the control logic. At this time, K1, K2, K5, K6, K8, K9 are all closed.

[0042] The second loop: the vehicle controller determines the working mode according to the vehicle configuration, sends the corresponding instruction, and controls the battery system assembly

[001] to close K5 and K6 with the battery unit BAT2 to form the second battery system loop according to the control logic. At this time, K1, K2, K4, K7, K8 and K9 are all prohibited from closing.

[0043] The circuit topology inside the controller module

[002] , wherein the A-phase winding is connected with Q1 and Q6 of the IGBT bridge, and Q1 uses a filter capacitor alone for high-voltage filtering, the B-phase and C-phase windings are connected with Q3 and Q4 and Q5 and Q2 of the IGBT bridge respectively, wherein Q3 and Q5 are connected together and use a filter capacitor for high-voltage filtering, and all the negative poles of the IGBT drive bridge share one ground.

[0044] The first and second loops realize the parallel connection of the battery ends and share the negative poles, and together with the controller module form a closed loop.

[0045] The vehicle controller determines the working mode according to the vehicle configuration, sends the corresponding instruction, and the controller module

[002] controls the internal IGBT bridge arms to be turned on at a specified frequency, and applies current to realize the alternating energy storage and discharge of the A, B and C phase windings, and at the same time realizes zero torque output by the controller module. That is, one cycle of pulse control between BAT1 and BAT2 systems is realized, and such control at a certain frequency realizes the heating efficiency of single battery pack double modules or whole pack battery replacement double pack low-temperature pulse mutual charging.

[0046] The above scheme of the embodiment can effectively solve the problem of realizing the heating efficiency of single battery pack double modules or whole pack battery replacement double pack low-temperature pulse mutual charging. The high-voltage architecture can realize 400V and 800V platform compatibility to meet the high-voltage fast charging transition scheme, effectively utilize the existing charging facilities, and solve the problem of low-temperature improvement of battery performance. The minimum system unit of BAT1 and BAT2 can be a cell string parallel connection cutting point, a module, or a whole pack.

[0047] Obviously, the specific implementation of the present application is not limited by the above-mentioned manner, and various non-essential improvements using the method concept and technical scheme of the present application are within the protection scope of the present application.

Claims

1. A high-voltage pulse heating system for vehicle-mounted power batteries, characterized in that: The system includes battery modules BAT1 and BAT2, and switches K1, K4, K5, K6, K7, and K9. The negative terminal of battery module BAT1 is connected to the positive terminal of battery module BAT2 via switch K1. The positive terminal of battery module BAT1 is led out to terminal A-0 via switch K4. Terminal A-0 is connected to the positive terminal of battery module BAT2 via switches K9 and K5 connected in series. Terminal B-0 is led out between switches K5 and K9. Terminal C-0 is led out of battery module BAT2 via switch K6. Terminals A-0, B-0, and C-0 are all connected to the drive module of the motor controller. The output terminal of the control module of the motor controller is connected to switches K1, K4, K5, K6, K7, K9, and the drive module, respectively.

2. The on-board power battery pulse heating high-voltage system as described in claim 1, characterized in that: The battery modules BAT1 and BAT2 are battery modules with the same number of cells in series and parallel.

3. The on-board power battery pulse heating high-voltage system as described in claim 1, characterized in that: Fuses are installed between battery module BAT1 and switch K4, and between battery module BAT2 and switch K6.

4. The on-board power battery pulse heating high-voltage system as described in claim 1, characterized in that: A pre-charge unit is connected in parallel across the two ends of the switch K4. The pre-charge unit includes a switch K3 and a resistor R1 connected in series.

5. A high-voltage pulse heating system for vehicle-mounted power batteries as described in any one of claims 1-4, characterized in that: The system also includes switches K2 and K8; the positive terminal of battery module BAT1 is led out to fast charging positive terminal D-0 via fuse and switch K2; the terminal between switch K6 and terminal C-0 is led out to fast charging negative terminal E-0 via switch K8.

6. A vehicle-mounted power battery pulse heating high-voltage system as described in any one of claims 1-4, characterized in that: A shunt S1 is connected in series between the switch K6 and the terminal C-0.

7. A high-voltage pulse heating system for vehicle-mounted power batteries as described in any one of claims 1-4, characterized in that: The drive module of the motor controller includes a bridge inverter, which has two positive terminals and one negative terminal, wherein the negative terminal is connected to C-0; and the two positive terminals are connected to A-0 and B-0 respectively.

8. A high-voltage pulse heating system for vehicle-mounted power batteries as described in any one of claims 1-4, characterized in that: The input terminal of the control module of the motor controller receives the control signal from the vehicle controller to realize pulse heating or power output functions.

9. A car, characterized in that: The vehicle includes an on-board power battery pulse heating high-voltage system as described in any one of claims 1-8.

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