CN113859052A - Battery heating system and battery heating method thereof - Google Patents

Battery heating system and battery heating method thereof Download PDF

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Publication number
CN113859052A
CN113859052A CN202010623877.1A CN202010623877A CN113859052A CN 113859052 A CN113859052 A CN 113859052A CN 202010623877 A CN202010623877 A CN 202010623877A CN 113859052 A CN113859052 A CN 113859052A
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China
Prior art keywords
motor controller
switch
power battery
motor
battery
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Granted
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CN202010623877.1A
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CN113859052B (en
Inventor
刘伟冬
王超
王兴辉
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BYD Co Ltd
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BYD Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
    • B60L58/27—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/615—Heating or keeping warm
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625—Vehicles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/63—Control systems
    • H01M10/637—Control systems characterised by the use of reversible temperature-sensitive devices, e.g. NTC, PTC or bimetal devices; characterised by control of the internal current flowing through the cells, e.g. by switching
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • H01M10/6567—Liquids
    • H01M10/6568—Liquids characterised by flow circuits, e.g. loops, located externally to the cells or cell casings
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The disclosure relates to a battery heating system and a battery heating method thereof, which are used for realizing self-heating of a battery. The method comprises the following steps: the device comprises a first power battery, a second power battery, a first motor controller connected with the first power battery, a second motor controller connected with the second power battery, a connecting switch, a water pipeline and a controller, wherein the connecting switch is arranged between the first motor controller and the second motor controller and is used for realizing the electric connection of the first motor controller and the second motor controller; the controller is used for controlling the first motor controller and the second motor controller to carry out charging and discharging energy exchange on the first power battery and the second power battery when the first motor controller and the second motor controller are electrically connected, so that heat generated by the first motor controller and the second motor controller in the charging and discharging energy exchange process is transferred to the first power battery and the second power battery through the waterway pipeline.

Description

Battery heating system and battery heating method thereof
Technical Field
The disclosure relates to the field of batteries, in particular to a battery heating system and a battery heating method thereof.
Background
With the popularization of electric vehicles, power batteries have become one of the important parts of electric vehicles. The power battery is used as a main energy storage device of a battery pack loaded on the electric automobile, is a key component of the electric automobile, and directly influences the performance of the electric automobile. The power battery has higher requirement on the working temperature, and if the working temperature is too high, the attenuation speed of the battery can be accelerated, so that the service life of the battery is reduced, and even safety accidents can be caused. In the related art, when the air Temperature is low, the battery heating module is arranged on the vehicle, the heat generated by the PTC heating acting is utilized to heat the whole vehicle circulation water path, and the heat is transferred to the battery through the water path, so that the heating of the battery is realized. However, adding a PTC battery heating module to the vehicle for battery heating increases costs and wastes energy.
Disclosure of Invention
The purpose of the present disclosure is to provide a battery heating system and a battery heating method thereof, so as to realize self-heating of a battery.
In order to achieve the above object, according to a first aspect of the present disclosure, there is provided a battery heating system including: the device comprises a first power battery, a second power battery, a first motor controller connected with the first power battery, a second motor controller connected with the second power battery, a connecting switch, a water channel pipeline and a controller, wherein the connecting switch is arranged between the first motor controller and the second motor controller and is used for realizing the electric connection of the first motor controller and the second motor controller, and the water channel pipeline passes through the first power battery, the second power battery, the first motor controller and the second motor controller;
the controller is used for controlling the first motor controller and the second motor controller to carry out charging and discharging energy exchange on the first power battery and the second power battery when the first motor controller and the second motor controller are electrically connected, so that heat generated by the first motor controller and the second motor controller in the charging and discharging energy exchange process is transferred to the first power battery and the second power battery through the waterway pipeline.
Optionally, the controller is configured to control the first motor controller to perform inverse discharge on the first power battery to obtain a first alternating current when the first motor controller is electrically connected with the second motor controller, and control the second motor controller to charge the second power battery by using the first alternating current; or,
the controller is used for controlling the second motor controller to perform inversion discharge on the second power battery to obtain second alternating current when the first motor controller is electrically connected with the second motor controller, and controlling the first motor controller to charge the first power battery by using the second alternating current.
Optionally, the controller is configured to control the first motor controller to perform inverse discharge on the first power battery when the first power battery is full or the first power battery is higher than the second power battery; or the controller is used for controlling the second motor controller to perform inverse discharge on the second power battery under the condition that the second power battery is full or the electric quantity of the second power battery is higher than that of the first power battery.
Optionally, the connection switch is provided with a first switch connected with the first motor controller, a second switch connected with the second motor controller, and a first contact;
the controller is used for controlling the first switch and the second switch to be connected to the first contact under the condition that the heating function of the battery heating system is started, so that the first motor controller and the second motor controller are electrically connected.
Optionally, the battery heating system further includes a first motor, and the connection switch is provided with a first switch connected to the first motor controller, a second switch connected to the second motor controller, a third switch connected to the first motor, and a first contact;
and the controller is used for controlling the first switch, the second switch and the third switch to be connected to the first contact when the heating function of the battery heating system is started and the vehicle is in a running state, and providing power for the vehicle through the first motor.
Optionally, the connection switch is further provided with a second contact connected with the first contact;
the controller is used for controlling the third switch to be connected to the second contact point so that the third switch is connected with the first contact point through the second contact point.
Optionally, the battery heating system further includes a first motor and a second motor, and the connection switch is provided with a first switch connected to the first motor controller, a second switch connected to the second motor controller, a third switch connected to the first motor, a third contact, and a fourth contact connected to the second motor;
the controller is used for controlling the first switch to be connected to the fourth contact point and controlling the second switch and the third switch to be connected to the third contact point respectively under the condition that the heating function of the battery heating system is not started so as to provide power for a vehicle through the first motor and the second motor.
According to a second aspect of the present disclosure, there is provided a battery heating method of a battery heating system, the battery heating system including: first power battery, second power battery, with first motor controller that first power battery is connected, with second motor controller, linked switch, water route pipeline and the controller that second power battery is connected, wherein, linked switch sets up between first motor controller and second motor controller for realize the electricity of first motor controller and second motor controller and be connected, the water route pipeline passes through first power battery, second power battery, first motor controller and second motor controller, the method is applied to the controller, includes:
when the first motor controller is electrically connected with the second motor controller, the first motor controller and the second motor controller are controlled to perform charging and discharging energy exchange on the first power battery and the second power battery, so that heat generated by the first motor controller and the second motor controller in the charging and discharging energy exchange process is transferred to the first power battery and the second power battery through the waterway pipeline.
Optionally, the controlling the first motor controller and the second motor controller to exchange charge and discharge energy between the first power battery and the second power battery includes:
controlling the first motor controller to perform inversion discharge on the first power battery to obtain first alternating current, and controlling the second motor controller to charge the second power battery by using the first alternating current; or,
and controlling the second motor controller to perform inversion discharge on the second power battery to obtain second alternating current, and controlling the first motor controller to charge the first power battery by using the second alternating current.
Optionally, the controlling the first motor controller to perform inverse discharge on the first power battery to obtain a first alternating current includes:
under the condition that the electric quantity of the first power battery is full or the electric quantity of the first power battery is higher than that of the second power battery, controlling the first motor controller to perform inverse discharge on the first power battery; or,
the control the second motor controller to discharge the second power battery in an inverted manner to obtain a second alternating current, including:
and under the condition that the second power battery is full or the electric quantity of the second power battery is higher than that of the first power battery, controlling the second motor controller to perform inverse discharge on the second power battery.
Optionally, the connection switch is provided with a first switch connected with the first motor controller, a second switch connected with the second motor controller, and a first contact;
the method further comprises the following steps:
and under the condition that the heating function of the battery heating system is started, controlling the first switch and the second switch to be connected to the first contact so as to electrically connect the first motor controller and the second motor controller.
Optionally, the battery heating system further includes a first motor, and the connection switch is provided with a first switch connected to the first motor controller, a second switch connected to the second motor controller, a third switch connected to the first motor, and a first contact;
the method further comprises the following steps:
when the heating function of the battery heating system is started and the vehicle is in a running state, the first switch, the second switch and the third switch are controlled to be connected to the first contact, and power is provided for the vehicle through the first motor.
Optionally, the connection switch is further provided with a second contact connected with the first contact;
the controlling the first switch, the second switch, and the third switch to be connected to the first contact includes:
controlling the first switch and the second switch to be connected to the first contact; and the number of the first and second groups,
controlling the third switch to connect to the second contact such that the third switch connects with the first contact through the second contact.
Optionally, the battery heating system further includes a first motor and a second motor, and the connection switch is provided with a first switch connected to the first motor controller, a second switch connected to the second motor controller, a third switch connected to the first motor, a third contact, and a fourth contact connected to the second motor;
the method further comprises the following steps:
and under the condition that the heating function of the battery heating system is not started, controlling the first switch to be connected to the fourth contact, and controlling the second switch and the third switch to be respectively connected to the third contact so as to provide power for the vehicle through the first motor and the second motor.
Through above-mentioned technical scheme, provide a battery heating system, this battery heating system includes: the water circuit comprises a first power battery, a second power battery, a first motor controller connected with the first power battery, a second motor controller connected with the second power battery, a connecting switch, a water circuit pipeline and a controller, wherein the connecting switch is arranged between the first motor controller and the second motor controller and used for realizing the electric connection of the first motor controller and the second motor controller, and the water circuit pipeline passes through the first power battery, the second power battery, the first motor controller and the second motor controller. When the first motor controller and the second motor controller are electrically connected, the controller controls the first motor controller and the second motor controller to exchange charging and discharging energy for the first power battery and the second power battery, so that heat generated by the first motor controller and the second motor controller in the process of exchanging the charging and discharging energy is transferred to the first power battery and the second power battery through the waterway pipeline. Like this, under the condition that needs heat the battery, the controller realizes first motor controller and second motor controller's electricity through control linked switch and connects to control first motor controller and second motor controller and carry out the charge-discharge energy exchange to first power battery and second power battery, the heat that produces will be passed through the water route pipeline and is transmitted to power battery at the charge-discharge energy exchange in-process, thereby accomplish the battery heating, need not with the help of PTC, can save cost and resource.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
FIG. 1 is a schematic diagram of a prior art battery heating system;
FIG. 2 is a schematic diagram illustrating a configuration of a battery heating system according to an exemplary embodiment;
FIG. 3 is a topology diagram of an exemplary first or second motor controller;
FIG. 4 is a topology diagram illustrating a battery heating system according to an exemplary embodiment;
FIG. 5 is a topology diagram illustrating another battery heating system according to an exemplary embodiment;
FIG. 6 is a topology diagram illustrating another battery heating system according to an exemplary embodiment;
FIG. 7 is a topology diagram illustrating another battery heating system according to an exemplary embodiment;
fig. 8 is a flowchart of a battery heating method of a battery heating system provided according to an embodiment of the present disclosure.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
With the popularization of electric vehicles, power batteries have become one of the important parts of electric vehicles. The power battery is used as a main energy storage device of a battery pack loaded on the electric automobile, is a key component of the electric automobile, and directly influences the performance of the electric automobile. The power battery has higher requirement on the working temperature, and if the working temperature is too high, the attenuation speed of the battery can be accelerated, so that the service life of the battery is reduced, and even safety accidents can be caused. In the related art, when the air Temperature is low, the battery heating module is arranged on the vehicle, the heat generated by the PTC heating acting is utilized to heat the whole vehicle circulation water path, and the heat is transferred to the battery through the water path, so that the heating of the battery is realized. Fig. 1 is a schematic diagram of an exemplary structure of a battery heating system in the prior art, and in fig. 1, the battery heating system includes a power battery, a motor controller, a motor, a DC-DC (direct current-direct current converter), an OBC (On board Charger), a PTC battery heating module, and a low-voltage battery. However, adding a PTC battery heating module to the vehicle for battery heating increases costs and wastes energy.
In order to solve the above problems, the present disclosure provides a battery heating system and a battery heating method thereof, which can heat a battery without using a PTC heating module.
In the battery heating system provided in the present disclosure, comprising: the device comprises a first power battery, a second power battery, a first motor controller connected with the first power battery, a second motor controller connected with the second power battery, a connecting switch, a water channel pipeline and a controller.
The connecting switch is arranged between the first motor controller and the second motor controller and used for realizing the electric connection of the first motor controller and the second motor controller. The water channel pipeline passes through the first power battery, the second power battery, the first motor controller and the second motor controller.
When the first motor controller and the second motor controller are electrically connected, the controller controls the first motor controller and the second motor controller to exchange charging and discharging energy for the first power battery and the second power battery, so that heat generated by the first motor controller and the second motor controller in the process of exchanging the charging and discharging energy is transferred to the first power battery and the second power battery through the waterway pipeline.
Like this, under the condition that needs heat the battery, the controller realizes first motor controller and second motor controller's electricity through control linked switch and connects to control first motor controller and second motor controller and carry out the charge-discharge energy exchange to first power battery and second power battery, the heat that produces will be passed through the water route pipeline and is transmitted to power battery at the charge-discharge energy exchange in-process, thereby accomplish the battery heating, need not with the help of PTC, can save cost and resource.
The present disclosure is described in detail below with reference to specific examples.
Fig. 2 is a schematic structural view illustrating a battery heating system according to an exemplary embodiment, the battery heating system, as shown in fig. 2, including: the device comprises a first power battery, a second power battery, a first motor controller connected with the first power battery, a second motor controller connected with the second power battery, a connecting switch, a water channel pipeline and a controller.
The batteries can be heated by arranging the water path pipeline, and in a normal situation, the first power battery and the second power battery need to be heated by utilizing heat generated by the first motor controller and the second motor controller, so that the water path pipeline at least needs to pass through the first power battery, the second power battery, the first motor controller and the second motor controller. In fig. 2, the waterway pipes are indicated by dotted lines, and it can be seen that the waterway pipes pass through the first power battery, the second power battery, the first motor controller, and the second motor controller. It should be noted that the water channel is not limited to the arrangement shown in fig. 2, and other water channel arrangements that can pass through the first power battery, the second power battery, the first motor controller and the second motor controller all belong to the protection scope of the present disclosure.
The waterway pipeline comprises a cooling water channel arranged inside the first power battery, the second motor controller and the first motor controller, and a communicating pipeline arranged among the first power battery, the second motor controller and the first motor controller.
The first power battery, the second power battery, the first motor controller and the second motor controller are all internally provided with cooling water channels, and the water pipeline communicates the cooling water channels inside the components through the first power battery, the second power battery, the first motor controller and the second motor controller.
The connecting switch is used for electrically connecting the components, is arranged between the first motor controller and the second motor controller and is used for realizing the electrical connection of the first motor controller and the second motor controller. For example, the connection switch may be provided with a first switch connected with the first motor controller, a second switch connected with the second motor controller, and a first contact. And, through controlling first switch and second switch to be connected to the first contact, can realize the electric connection of first motor controller and second motor controller.
The controller is respectively connected with the first motor controller, the second motor controller and the connecting switch and is used for controlling the on-off of the switch inside the component.
The controller is used for controlling the first motor controller and the second motor controller to carry out charging and discharging energy exchange on the first power battery and the second power battery when the first motor controller and the second motor controller are electrically connected, so that heat generated by the first motor controller and the second motor controller in the charging and discharging energy exchange process is transferred to the first power battery and the second power battery through the waterway pipeline.
For example, the connection switch may be provided with a first switch connected with the first motor controller, a second switch connected with the second motor controller, and a first contact. Therefore, the controller can control the first switch and the second switch to be connected to the first contact under the condition that the heating function of the battery heating system is started, so that the first motor controller and the second motor controller are electrically connected, and the battery heating is further realized.
Illustratively, the first motor controller employs a motor controller having a bi-directional function. The first motor controller can enable the first power battery to output electric energy to drive the motor to work, so that the inversion function is realized, and the electric quantity output by an external device can be charged into the first power battery, so that the rectification function is realized. The second motor controller may be selected in the same manner as the first motor controller, i.e. using a motor controller with a bi-directional function. The topology of the first motor controller or the second motor controller may be as shown in fig. 3. As described above, the controller is connected to the first motor controller, the second motor controller, and the connection switch, respectively, so that the three can be controlled.
In the invention, the first motor controller and the second motor controller exchange charge and discharge energy for the first power battery and the second power battery through the first motor controller and the second motor controller, so that the heat generated in the charge and discharge energy exchange process of the first motor controller and the second motor controller is transferred to the first power battery and the second power battery through a waterway pipeline to heat the first power battery and the second power battery, and in the battery heating process, the energy in the first power battery and the second power battery flows back and forth, wherein a part of the energy is lost in the form of heat, thereby reducing the energy loss in the battery heating process as much as possible.
In one possible embodiment, the controller is configured to control the first motor controller to perform inverse discharge on the first power battery to obtain a first alternating current when the first motor controller and the second motor controller are electrically connected, and control the second motor controller to charge the second power battery by using the first alternating current.
The controller is used for controlling the first motor controller to perform inverse discharge on the first power battery under the condition that the electric quantity of the first power battery is full or the electric quantity of the first power battery is higher than the electric quantity of the second power battery.
In another possible embodiment, the controller is configured to control the second motor controller to perform inverse discharge on the second power battery to obtain a second alternating current when the first motor controller and the second motor controller are electrically connected, and control the first motor controller to charge the first power battery with the second alternating current.
The controller is used for controlling the second motor controller to perform inverse discharge on the second power battery under the condition that the second power battery is full or the electric quantity of the second power battery is higher than that of the first power battery.
FIG. 4 is a topology diagram illustrating a battery heating system according to an exemplary embodiment. The OBC can charge the first power battery and the second power battery, and can realize grid connection and discharge of vehicle-mounted electric appliances. The OBC can be controlled to charge (or stop charging) the first power battery by controlling the connection (or disconnection) of the first power distribution switch. The OBC can be controlled to charge (or stop charging) the second power battery by controlling the connection (or disconnection) of the second power distribution switch. As described above, the waterway conduit should pass through at least the first power battery, the second power battery, the first motor controller, and the second motor controller. For example, in the battery heating system shown in fig. 4, the water tank and the water pump of the water path pipe may be disposed near the second power battery, and at the same time, the water path pipe may sequentially pass through the second power battery, the second motor controller, the first motor controller, and the first power battery. Through setting up the water route pipeline, can take the heat that produces in the battery heating system working process to the battery, for the battery heating.
An exemplary internal configuration of the connection switch is shown in fig. 4, and as shown in fig. 4, the connection switch is provided with a first switch S1 connected to the first motor controller, a second switch S2 connected to the second motor controller, and a first contact a. In fig. 4, only the internal configuration of the connection switch is shown, and in this case, the connection switch does not have any connection.
Wherein the controller may control the first switch (S1 in fig. 4) and the second switch (S2 in fig. 4) to be connected to the first contact (a in fig. 4) in case that the heating function of the battery heating system is turned on, so that the first motor controller and the second motor controller are electrically connected. Therefore, when the first motor controller and the second motor controller are electrically connected, the controller can control the first motor controller and the second motor controller to exchange charging and discharging energy for the first power battery and the second power battery, so that heat generated by the first motor controller and the second motor controller in the process of exchanging the charging and discharging energy is transferred to the first power battery and the second power battery through the waterway pipeline.
After the controller controls the first switch and the second switch to be connected to the first contact point in the above manner, the topology of the battery heating system may be as shown in fig. 5, in which case the first motor controller and the second motor controller are electrically connected through the first contact point a. And then, the first motor controller and the second motor controller can be controlled to exchange charging and discharging energy between the first power battery and the second power battery so as to generate heat to heat the batteries.
When the first switch S1 and the second switch S2 are connected to the first contact a, the controller may control the first motor controller to perform inverse discharge on the first power battery, obtain the first alternating current, and control the second motor controller to charge the second power battery using the first alternating current. Alternatively, the controller may control the second motor controller to perform inverse discharge on the second power battery to obtain the second alternating current when the first switch S1 and the second switch S2 are connected to the first contact a, and control the first motor controller to charge the first power battery with the second alternating current. Therefore, the first power battery is continuously utilized to charge the second power battery, or the second power battery is utilized to charge the first power battery, so that heat can be continuously generated, and further, the batteries can be heated.
In one possible embodiment, the controller may control the first motor controller to perform inverse discharge on the first power battery when the first power battery is full or the first power battery is higher than the second power battery; or, the controller may control the second motor controller to perform inverse discharge on the second power battery when the second power battery is full or the electric quantity of the second power battery is higher than the electric quantity of the first power battery. That is, when a certain power battery is full or the power battery is higher than another power battery, the other power battery can be charged by the power battery. For example, if the first power battery is full or the power of the first power battery is higher than that of the second power battery in the initial situation, when the first switch S1 and the second switch S2 are connected to the first contact a, the controller may first control the first motor controller to perform inverse transformation discharging on the first power battery with higher power to obtain the first alternating current, and control the second motor controller to charge the second power battery with the first alternating current, and then, after the second power battery is fully charged, reverse the process, that is, the controller controls the second motor controller to perform inverse transformation discharging on the second power battery to obtain the second alternating current, and controls the first motor controller to charge the first power battery with the second alternating current, and so on.
As illustrated in fig. 5, the process is not connected to the motor, and therefore, cannot provide power for the vehicle, and therefore, the process can be applied to a scenario in which the vehicle is in a non-driving state.
In a possible embodiment, the battery heating system may further include a first motor, and the connection switch is provided with a first switch connected with the first motor controller, a second switch connected with the second motor controller, a third switch connected with the first motor, and a first contact.
And the controller may control the first switch, the second switch, and the third switch to be connected to the first contact and power the vehicle through the first motor, in a case where a heating function of the battery heating system is turned on and the vehicle is in a driving state.
The internal construction of the connection switch is represented in fig. 5 as in fig. 4. Wherein the third switch may be as shown at S3 in fig. 4 and 5.
When the heating function of the battery heating system is turned on and the vehicle is in a running state, the battery needs to be heated and the vehicle needs to be powered, and therefore the motor needs to be connected. Thus, the controller may control the first switch, the second switch, and the third switch to be connected to the first contact and power the vehicle via the first motor. Therefore, the battery heating in the running process of the vehicle can be realized, and the battery heating can be further accelerated by simultaneously driving the motor and heating the battery.
Fig. 5 shows a connection mode of the connection switch in a case where the battery heating function is on, and if the battery heating function is on and the vehicle is in a running state, it is necessary to connect the third switch to the first contact based on the connection mode of the connection switch in fig. 5 (in fig. 5, the first switch and the second switch are already connected to the first contact). For example, based on the connection manner shown in fig. 5, a third switch S3 may be further connected to the first contact a to electrically connect the first motor and the first and second motor controllers.
All switches cannot be directly connected to the same contact, limited by the number of contacts to which the switch itself can be connected and the number of contacts to which the contacts can be connected (e.g., one contact can only be connected by two switches), and therefore, another contact connected to a certain contact may be provided to increase the number of contacts to which the same contact is connected.
Therefore, in another possible embodiment, the connection switch may be further provided with a second contact connected with the first contact, and the controller may control the third switch to be connected to the second contact when connected to the first contact, so that the third switch is connected with the first contact through the second contact. As shown in fig. 6, the first motor is connected to the second contact B through the third switch S3, and the second contact B is connected to the first contact a, which is equivalent to connecting the first motor to the first contact a.
In a possible embodiment, the battery heating system further comprises a first motor and a second motor, and the connection switch is provided with a first switch connected with the first motor controller, a second switch connected with the second motor controller, a third switch connected with the first motor, a third contact and a fourth contact connected with the second motor.
The controller is used for controlling the first switch to be connected to the fourth contact point and controlling the second switch and the third switch to be connected to the third contact point respectively under the condition that the heating function of the battery heating system is not started so as to provide power for the vehicle through the first motor and the second motor.
In the case where the heating function of the battery heating system is not turned on, as shown in fig. 7, the first switch S1 is connected to the fourth contact D, and the second switch S2 and the third switch S3 are connected to the third contact C, respectively. Therefore, the second motor can be supplied with power through the first power battery so as to provide power for the vehicle through the second motor, and the first motor can be supplied with power through the second power battery so as to provide power for the vehicle through the first motor. This connection corresponds to a scenario where the two motors drive the vehicle separately.
Fig. 8 is a flowchart of a battery heating method of a battery heating system provided according to an embodiment of the present disclosure. The battery heating system includes: the water circuit comprises a first power battery, a second power battery, a first motor controller connected with the first power battery, a second motor controller connected with the second power battery, a connecting switch, a water circuit pipeline and a controller, wherein the connecting switch is arranged between the first motor controller and the second motor controller and used for realizing the electric connection of the first motor controller and the second motor controller, and the water circuit pipeline passes through the first power battery, the second power battery, the first motor controller and the second motor controller. Wherein the method may be applied to a controller. As shown in fig. 8, the method may include the following steps.
In step 81, an electrical connection of the first motor controller and the second motor controller is detected.
In step 82, when the first motor controller and the second motor controller are electrically connected, the first motor controller and the second motor controller are controlled to exchange charging and discharging energy for the first power battery and the second power battery, so that heat generated by the first motor controller and the second motor controller in the process of exchanging the charging and discharging energy is transferred to the first power battery and the second power battery through the waterway pipeline.
Through the scheme, under the condition that the battery needs to be heated, the first motor controller is electrically connected with the second motor controller, the first motor controller and the second motor controller are controlled to carry out charging and discharging energy exchange on the first power battery and the second power battery, heat generated in the charging and discharging energy exchange process is transmitted to the power battery through the waterway pipeline, the battery is heated without the help of PTC, and cost and resources can be saved.
Optionally, step 82 may include the steps of:
controlling a first motor controller to perform inversion discharge on a first power battery to obtain first alternating current, and controlling a second motor controller to charge a second power battery by using the first alternating current; or,
and controlling the second motor controller to perform inversion discharge on the second power battery to obtain second alternating current, and controlling the first motor controller to charge the first power battery by using the second alternating current.
Optionally, the controlling the first motor controller to perform inverse discharge on the first power battery to obtain a first alternating current includes:
under the condition that the electric quantity of the first power battery is full or the electric quantity of the first power battery is higher than that of the second power battery, controlling the first motor controller to perform inversion discharge on the first power battery; or,
controlling a second motor controller to perform inverse discharge on a second power battery to obtain second alternating current, and the method comprises the following steps:
and controlling the second motor controller to perform inverse discharge on the second power battery under the condition that the second power battery is full or the electric quantity of the second power battery is higher than that of the first power battery.
Optionally, the connection switch is provided with a first switch connected with the first motor controller, a second switch connected with the second motor controller, and a first contact;
the method further comprises the following steps:
and under the condition that the heating function of the battery heating system is started, controlling the first switch and the second switch to be connected to the first contact so as to electrically connect the first motor controller and the second motor controller.
Optionally, the battery heating system further comprises a first motor, and the connection switch is provided with a first switch connected with the first motor controller, a second switch connected with the second motor controller, a third switch connected with the first motor, and a first contact;
the method further comprises the following steps:
when the heating function of the battery heating system is started and the vehicle is in a running state, the first switch, the second switch and the third switch are controlled to be connected to the first contact, and the vehicle is powered through the first motor.
Through the scheme, the heating of the battery can be realized, the power required by running can be provided for the vehicle, so that the vehicle battery can be heated in the running process of the vehicle, the motor is driven and the battery is heated at the same time, and the speed of heating the battery can be further accelerated.
Optionally, the connection switch is further provided with a second contact connected with the first contact;
controlling the first switch, the second switch, and the third switch to be connected to the first contact, includes:
controlling the first switch and the second switch to be connected to the first contact; and the number of the first and second groups,
and controlling the third switch to be connected to the second contact so that the third switch is connected with the first contact through the second contact.
Optionally, the battery heating system further includes a first motor and a second motor, the connection switch is provided with a first switch connected with the first motor controller, a second switch connected with the second motor controller, a third switch connected with the first motor, a third contact, and a fourth contact connected with the second motor;
the method further comprises the following steps:
and under the condition that the heating function of the battery heating system is not started, controlling the first switch to be connected to the fourth contact, and controlling the second switch and the third switch to be respectively connected to the third contact so as to provide power for the vehicle through the first motor and the second motor.
Through the scheme, under the condition that a vehicle battery is not required to be heated, the vehicle can be respectively driven through the two motors, and required power is provided for the vehicle.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, various possible combinations will not be separately described in this disclosure.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims (14)

1. A battery heating system, comprising: the device comprises a first power battery, a second power battery, a first motor controller connected with the first power battery, a second motor controller connected with the second power battery, a connecting switch, a water channel pipeline and a controller, wherein the connecting switch is arranged between the first motor controller and the second motor controller and is used for realizing the electric connection of the first motor controller and the second motor controller, and the water channel pipeline passes through the first power battery, the second power battery, the first motor controller and the second motor controller;
the controller is used for controlling the first motor controller and the second motor controller to carry out charging and discharging energy exchange on the first power battery and the second power battery when the first motor controller and the second motor controller are electrically connected, so that heat generated by the first motor controller and the second motor controller in the charging and discharging energy exchange process is transferred to the first power battery and the second power battery through the waterway pipeline.
2. The battery heating system according to claim 1, wherein the controller is configured to control the first motor controller to perform inverse discharge on the first power battery to obtain a first alternating current, and control the second motor controller to charge the second power battery with the first alternating current when the first motor controller and the second motor controller are electrically connected; or,
the controller is used for controlling the second motor controller to perform inversion discharge on the second power battery to obtain second alternating current when the first motor controller is electrically connected with the second motor controller, and controlling the first motor controller to charge the first power battery by using the second alternating current.
3. The battery heating system according to claim 2, wherein the controller is configured to control the first motor controller to perform inverse discharge on the first power battery when the first power battery is full or the first power battery is higher than the second power battery; or the controller is used for controlling the second motor controller to perform inverse discharge on the second power battery under the condition that the second power battery is full or the electric quantity of the second power battery is higher than that of the first power battery.
4. The battery heating system according to claim 1, wherein the connection switch is provided with a first switch connected with the first motor controller, a second switch connected with the second motor controller, and a first contact;
the controller is used for controlling the first switch and the second switch to be connected to the first contact under the condition that the heating function of the battery heating system is started, so that the first motor controller and the second motor controller are electrically connected.
5. The battery heating system according to claim 1, further comprising a first motor, wherein the connection switch is provided with a first switch connected to the first motor controller, a second switch connected to the second motor controller, a third switch connected to the first motor, and a first contact;
and the controller is used for controlling the first switch, the second switch and the third switch to be connected to the first contact when the heating function of the battery heating system is started and the vehicle is in a running state, and providing power for the vehicle through the first motor.
6. The battery heating system according to claim 5, wherein the connection switch is further provided with a second contact connected with the first contact;
the controller is used for controlling the third switch to be connected to the second contact point so that the third switch is connected with the first contact point through the second contact point.
7. The battery heating system according to claim 1, further comprising a first motor and a second motor, the connection switch being provided with a first switch connected to the first motor controller, a second switch connected to the second motor controller, a third switch connected to the first motor, a third contact, and a fourth contact connected to the second motor;
the controller is used for controlling the first switch to be connected to the fourth contact point and controlling the second switch and the third switch to be connected to the third contact point respectively under the condition that the heating function of the battery heating system is not started so as to provide power for a vehicle through the first motor and the second motor.
8. A battery heating method of a battery heating system, the battery heating system comprising: first power battery, second power battery, with first motor controller that first power battery is connected, with second motor controller, linked switch, water route pipeline and the controller that second power battery is connected, wherein, linked switch sets up between first motor controller and second motor controller for realize the electricity of first motor controller and second motor controller and be connected, the water route pipeline passes through first power battery, second power battery, first motor controller and second motor controller, the method is applied to the controller, includes:
when the first motor controller is electrically connected with the second motor controller, the first motor controller and the second motor controller are controlled to perform charging and discharging energy exchange on the first power battery and the second power battery, so that heat generated by the first motor controller and the second motor controller in the charging and discharging energy exchange process is transferred to the first power battery and the second power battery through the waterway pipeline.
9. The method of claim 8, wherein said controlling said first and second motor controllers to exchange charge and discharge energy between said first and second power batteries comprises:
controlling the first motor controller to perform inversion discharge on the first power battery to obtain first alternating current, and controlling the second motor controller to charge the second power battery by using the first alternating current; or,
and controlling the second motor controller to perform inversion discharge on the second power battery to obtain second alternating current, and controlling the first motor controller to charge the first power battery by using the second alternating current.
10. The method according to claim 9, wherein the controlling the first motor controller to perform inverse discharge on the first power battery to obtain a first alternating current comprises:
under the condition that the electric quantity of the first power battery is full or the electric quantity of the first power battery is higher than that of the second power battery, controlling the first motor controller to perform inverse discharge on the first power battery; or,
the control the second motor controller to discharge the second power battery in an inverted manner to obtain a second alternating current, including:
and under the condition that the second power battery is full or the electric quantity of the second power battery is higher than that of the first power battery, controlling the second motor controller to perform inverse discharge on the second power battery.
11. The method according to claim 8, wherein the connection switch is provided with a first switch connected with the first motor controller, a second switch connected with the second motor controller, and a first contact;
the method further comprises the following steps:
and under the condition that the heating function of the battery heating system is started, controlling the first switch and the second switch to be connected to the first contact so as to electrically connect the first motor controller and the second motor controller.
12. The method of claim 8, wherein the battery heating system further comprises a first motor, the connection switch is provided with a first switch connected to the first motor controller, a second switch connected to the second motor controller, a third switch connected to the first motor, and a first contact;
the method further comprises the following steps:
when the heating function of the battery heating system is started and the vehicle is in a running state, the first switch, the second switch and the third switch are controlled to be connected to the first contact, and power is provided for the vehicle through the first motor.
13. The method according to claim 12, wherein the connection switch is further provided with a second contact connected with the first contact;
the controlling the first switch, the second switch, and the third switch to be connected to the first contact includes:
controlling the first switch and the second switch to be connected to the first contact; and the number of the first and second groups,
controlling the third switch to connect to the second contact such that the third switch connects with the first contact through the second contact.
14. The method of claim 8, wherein the battery heating system further comprises a first motor and a second motor, the connection switch being provided with a first switch connected to the first motor controller, a second switch connected to the second motor controller, a third switch connected to the first motor, a third contact, and a fourth contact connected to the second motor;
the method further comprises the following steps:
and under the condition that the heating function of the battery heating system is not started, controlling the first switch to be connected to the fourth contact, and controlling the second switch and the third switch to be respectively connected to the third contact so as to provide power for the vehicle through the first motor and the second motor.
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