CN216424147U - Power battery system and vehicle - Google Patents

Power battery system and vehicle Download PDF

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Publication number
CN216424147U
CN216424147U CN202121995272.1U CN202121995272U CN216424147U CN 216424147 U CN216424147 U CN 216424147U CN 202121995272 U CN202121995272 U CN 202121995272U CN 216424147 U CN216424147 U CN 216424147U
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battery pack
power battery
motor
loop
cooling
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CN202121995272.1U
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徐琪
贾旭
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China Express Jiangsu Technology Co Ltd
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China Express Jiangsu Technology Co Ltd
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    • 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
    • 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
    • Y02T10/72—Electric energy management in electromobility

Abstract

The utility model discloses a power battery system and a vehicle. The power battery system includes: the system comprises a power battery pack, a motor system and a cooling loop; the motor system comprises a motor controller and a driving motor; the power battery pack is connected with the motor controller, and the driving motor is connected with the motor controller; the D-axis current of the driving motor is a sinusoidal current output by the power battery pack; the power battery pack is circularly connected with the cooling loop, and the motor system is circularly connected with the cooling loop. By adopting the utility model, the power battery pack can be effectively heated, so that the continuous and efficient work of the battery pack under the low-temperature working condition can be met, and the energy consumption can be effectively reduced.

Description

Power battery system and vehicle
Technical Field
The utility model relates to the technical field of electric automobiles, in particular to a power battery system and a vehicle.
Background
In recent years, with the rapid development of the new energy automobile industry, electric automobile products have been accepted by the masses and have entered into thousands of households. The battery is used as a power source of the new energy automobile and continuously provides electric energy for the driving motor.
Although the technology of the electric automobile realizes the leap-type development, some technologies are not broken through, wherein the development of the new energy automobile is severely restricted by the problems of low charging and discharging efficiency, short service life of the battery pack and the like in the low-temperature environment of the battery pack. In order to enable efficient charging and discharging of the battery pack in a low temperature environment, a battery pack thermal management technology is gradually and widely adopted.
At present, regarding the problem of low-temperature performance attenuation of the power battery, an external heating method is generally adopted, a special electric heating system is added in the power battery to realize heating of the power battery, such as an electric heater or a liquid heater, and heat is applied to the battery from the outside to increase the temperature of the battery; or the power battery is driven by the motor to realize self-heating, so that the temperature of the power battery is increased to meet the performance requirement. However, the inventors found that the prior art has at least the following problems: the battery energy consumed by the extra heat generated by the external heating system is relatively high, and the energy lost by the motor drive is neglected by adopting the battery self-heating method, so that the problem of low energy utilization rate of the vehicle exists.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model aims to provide a power battery system and a vehicle, which can effectively realize heating of a power battery pack so as to meet continuous and efficient work of the battery pack under a low-temperature working condition and effectively reduce energy consumption.
To achieve the above object, an embodiment of the present invention provides a power battery system, including: the system comprises a power battery pack, a motor system and a cooling loop; the motor system comprises a motor controller and a driving motor;
the power battery pack is connected with the motor controller, and the driving motor is connected with the motor controller; the D-axis current of the driving motor is a sinusoidal current output by the power battery pack;
the power battery pack is circularly connected with the cooling loop, and the motor system is circularly connected with the cooling loop.
As a modification of the above, the cooling circuit includes a battery pack circuit, a motor cooling circuit, and a switching element;
the power battery pack is circularly connected with the battery pack loop, the motor system is circularly connected with the motor cooling loop, and the battery pack loop is communicated or disconnected with the motor cooling loop through the switch element.
As an improvement of the above scheme, the switch element is a four-way hydraulic valve; the heat input end of the battery pack loop is connected with a first liquid outlet of the four-way hydraulic valve, and the cold output end of the battery pack loop is connected with a first liquid inlet of the four-way hydraulic valve; the cold quantity input end of the motor cooling loop is connected with the second liquid outlet of the four-way hydraulic valve, and the heat quantity output end of the motor cooling loop is connected with the second liquid inlet of the four-way hydraulic valve.
As an improvement of the above scheme, the cooling liquid in the battery pack loop and the motor cooling loop is cooling water.
As an improvement of the scheme, the power battery system further comprises a heater, and the heater is connected with the cold output end of the battery pack loop.
An embodiment of the utility model further provides a vehicle, which comprises the power battery system.
Compared with the prior art, when the vehicle is static, the power battery pack provides energy for the shaft D of the driving motor, so that the driving motor realizes current output but no torque output, on one hand, the internal resistance of the power battery pack realizes self-heating through positive and negative alternate sinusoidal current, and on the other hand, the heat generated by the motor system is transferred to one side of the power battery through the cooling loop to provide heat for the power battery. The working performance of the power battery pack in a low-temperature state is maintained without additionally arranging an external heating element, and meanwhile, heat generated in the current output process of the driving battery can be utilized, so that the self energy reflux of the motor system is utilized to the maximum extent to heat the power battery pack. In the embodiment of the utility model, two heating modes of the power battery pack are supplemented, so that the energy of the whole system is fully utilized, the energy utilization rate is improved, and the heating rate of the power battery pack is increased. And in a low-temperature charging scene, the charging time can be effectively shortened.
Drawings
FIG. 1 is a schematic structural diagram of a power battery system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a preferred connection structure of a power battery and a motor system according to an embodiment of the utility model;
FIG. 3 is a schematic diagram of a preferred connection structure of the power battery, the cooling circuit and the motor system according to the embodiment of the utility model;
fig. 4 is a schematic structural diagram of a vehicle according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a schematic structural diagram of a power battery system according to an embodiment of the present invention is shown. An embodiment of the present invention provides a power battery system 10, including: a power battery pack 11, a motor system 12 and a cooling circuit 13. The motor system 12 includes a motor controller 121 and a drive motor 122.
The power battery pack 11 is connected with the motor controller 121, and the driving motor 122 is connected with the motor controller 121; the D-axis current of the driving motor 122 is a sinusoidal current output by the power battery pack 11. The power battery pack 11 is circularly connected with the cooling loop 13, and the motor system 12 is circularly connected with the cooling loop 13.
Specifically, in the embodiment of the present invention, the power battery pack 11 refers to a power supply for providing power source for each functional module of the electric vehicle, and is structurally composed of a plurality of battery cells connected in series and/or in parallel.
The power battery pack 11 may be a lead-acid battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lithium ion battery, etc., which are not limited in the present invention.
Referring to fig. 2, a schematic diagram of a connection structure of a preferred power battery and motor system according to an embodiment of the present invention is shown. The power battery pack 11 is connected with the driving motor 122 through the motor controller 121, and the power battery pack 11 provides energy for the operation of the motor system 12.
The motor controller 121 includes an Insulated Gate Bipolar Transistor (IGBT) module inside, and the motor controller 121 is further provided with a driving board and a control board, where the control board is used to implement a motor control algorithm, and the driving board is used to respond to a control signal sent by the driving board to drive the IGBT module to operate, so that the driving motor 122 outputs a driving force.
It can be understood that the motor controller 121 is further configured to be connected to a vehicle control unit, a battery management system, and the like of the electric vehicle, and the motor controller 121 implements control over the driving motor 122 according to a control instruction issued by the vehicle control unit, so as to drive the electric vehicle to run, or implement a self-heating function of the power battery pack.
In one case, the power battery pack 11 may be in a discharge or charge state during the movement of the electric vehicle, and the power battery pack may generate heat.
In another case, when the electric vehicle is in a stationary state, the low temperature environment may cause a decrease in the charging and discharging efficiency of the power battery pack, a decrease in the life of the power battery pack, and the like. Thus, when the vehicle is stationary, power pack 11 is controlled to energize drive motor 122, thereby adding a sinusoidal current to the D-axis of drive motor 122. The drive motor 122 can achieve current output but no torque output. At this time, sinusoidal current alternately output by positive and negative at one side of the power battery pack 11 can enable the power battery pack 11 to be in a charging-discharging circulation state repeatedly, so that heating of the internal resistance of the battery is promoted, heating of the power battery pack 11 is achieved by means of heat generated by the internal resistance of the power battery, and a self-heating function of the power battery pack is achieved.
Further, referring to fig. 1, the power battery pack 11 is circularly connected with the cooling circuit 13, the motor system 12 is circularly connected with the cooling circuit 13, and the cooling liquid in the cooling circuit is cooling water, so as to form a complete cooling system loop.
Since the motor system 12 generates heat when operated under the power supplied by the power battery pack 11, specifically, the heat generated by the motor system 12 mainly comes from the heat generated by the driving motor windings and the heat generated by the IGBT modules. This part of heat is transferred to the cooling circuit 13 to heat the cooling water in the cooling circuit 13 and transferred to the power battery pack 11 side, so as to provide heat for the power battery pack 11, and thus heat the power battery pack 11.
The embodiment of the utility model provides a power battery system, which supplies energy to a D shaft of a driving motor through a power battery pack to enable the driving motor to realize current output but no torque output. The working performance of the power battery pack in a low-temperature state is maintained without additionally arranging an external heating element, and meanwhile, heat generated in the current output process of the driving battery can be utilized, so that the self energy reflux of the motor system is utilized to the maximum extent to heat the power battery pack. In the embodiment of the utility model, two heating modes of the power battery pack are supplemented, so that the energy of the whole system is fully utilized, the energy utilization rate is improved, and the heating rate of the power battery pack is increased. And in a low-temperature charging scene, the charging time can be effectively shortened.
Referring to fig. 3, a schematic diagram of a connection structure of a power battery, a cooling circuit and a motor system according to an embodiment of the present invention is shown. The cooling circuit 13 includes a battery pack circuit 131, a motor cooling circuit 132, and a switching element 133.
The power battery pack 11 is circularly connected with the battery pack loop 131, the motor system 12 is circularly connected with the motor cooling loop 132, and the battery pack loop 131 is connected with or disconnected from the motor cooling loop 132 through the switching element 133.
Preferably, the cooling fluid in the battery pack circuit and the motor cooling circuit is cooling water.
In an embodiment of the present invention, the cooling circuit 13 may be divided into two independent circuits, including a battery pack circuit 131 and a motor cooling circuit 132. The switching element 133 is controlled to connect and disconnect the battery pack circuit 131 and the motor cooling circuit 132.
When the vehicle is in normal operation, the battery pack circuit 131 and the motor cooling circuit 132 are disconnected, forming two circuits independent of each other. The battery pack loop 131 implements a cooling cycle for the power battery pack 11, and the motor cooling loop 132 implements a cooling cycle for the motor system 12.
When the vehicle is at rest and the heating function of the power battery pack is activated, the battery pack circuit 131 and the motor cooling circuit 132 are in communication to form a complete cooling circuit. The heat generated by the output current of the motor system 12 is transferred to the battery pack circuit 131 through the motor cooling circuit 132 to heat the power battery pack.
Preferably, referring to fig. 3, the switching element 133 is a four-way hydraulic valve.
The heat input end of the battery pack loop 131 is connected with a first liquid outlet OUT1 of the four-way hydraulic valve, and the cold output end of the battery pack loop 131 is connected with a first liquid inlet IN1 of the four-way hydraulic valve; the cold quantity input end of the motor cooling loop 132 is connected with the second liquid outlet OUT2 of the four-way hydraulic valve, and the heat quantity output end of the motor cooling loop 132 is connected with the second liquid inlet IN2 of the four-way hydraulic valve.
As shown IN fig. 3(a), when the first outlet port OUT1 and the first inlet port IN1 of the four-way hydraulic valve are conductive and the second outlet port OUT2 and the second inlet port IN2 of the four-way hydraulic valve are conductive, the battery pack circuit 131 and the motor cooling circuit 132 are IN parallel and independent of each other. The battery pack loop 131 implements a cooling cycle for the power battery pack 11, and the motor cooling loop 132 implements a cooling cycle for the motor system 12.
As shown IN fig. 3(b), when the first inlet port IN1 and the second outlet port OUT2 of the four-way hydraulic valve are conducted and the first outlet port OUT1 and the second inlet port IN2 are conducted, the battery pack circuit 131 and the motor cooling circuit 132 are connected IN series to form a complete cooling circuit, and share a set of cooling system. The heat generated by the output current of the motor system 12 is transferred to the battery pack circuit 131 through the motor cooling circuit 132 to heat the power battery pack.
In a preferred embodiment, the power battery system 10 further comprises a heater connected to the cold output of the battery pack loop 131.
In the embodiment of the present invention, in order to increase the heating rate of the power battery pack 11, the heater may be additionally disposed at the cold output end of the battery pack loop 131 to heat the cooling water in the battery pack loop 131, so as to achieve auxiliary heating of the power battery pack 11.
By adopting the technical means of the embodiment of the utility model, the heating rate of the power battery pack can be effectively improved. And in a low-temperature charging scene, the charging time can be effectively shortened.
Fig. 4 is a schematic structural diagram of a vehicle according to an embodiment of the present invention. The embodiment of the utility model provides a vehicle 20, which comprises a power battery system 21, wherein the power battery system 21 is the power battery system 10 provided by the embodiment.
Specifically, the power battery system 21 includes: the system comprises a power battery pack, a motor system and a cooling loop; the motor system includes a motor controller and a drive motor.
The power battery pack is connected with the motor controller, and the driving motor is connected with the motor controller; the D-axis current of the driving motor is a sinusoidal current output by the power battery pack; the power battery pack is circularly connected with the cooling loop, and the motor system is circularly connected with the cooling loop.
By adopting the embodiment, when the electric automobile is in a static state, the low-temperature environment can cause the charging and discharging efficiency of the power battery pack to be reduced, the service life of the power battery pack is shortened, and the like. Thus, when the vehicle is stationary, the power battery pack is controlled to energize the drive motor, thereby adding a sinusoidal current to the D-axis of the drive motor. The driving motor can realize current output but no torque output. At the moment, the sinusoidal current alternately output by positive and negative can make the power battery be in a charging-discharging circulation state repeatedly, so that the heating of the internal resistance of the battery is promoted, the heating of the power battery pack is realized by utilizing the heat generated by the internal resistance of the power battery, and the self-heating function of the power battery pack is realized.
Meanwhile, as the motor system generates heat when working under the energy supply of the power battery pack, particularly, the heat generated by the motor system mainly comes from the heating of the driving motor winding and the heating of the IGBT module. The part of heat is transferred to the cooling loop to heat cooling water in the cooling loop and transferred to one side of the power battery pack, so that heat is provided for the power battery pack, and the power battery pack is heated.
Preferably, the cooling circuit includes a battery pack circuit, a motor cooling circuit, and a switching element; the power battery pack is circularly connected with the battery pack loop, the motor system is circularly connected with the motor cooling loop, and the battery pack loop is communicated or disconnected with the motor cooling loop through the switch element.
The switch element is a four-way hydraulic valve; the heat input end of the battery pack loop is connected with a first liquid outlet of the four-way hydraulic valve, and the cold output end of the battery pack loop is connected with a first liquid inlet of the four-way hydraulic valve; the cold quantity input end of the motor cooling loop is connected with the second liquid outlet of the four-way hydraulic valve, and the heat quantity output end of the motor cooling loop is connected with the second liquid inlet of the four-way hydraulic valve.
When the first liquid outlet and the first liquid inlet of the four-way hydraulic valve are communicated and the second liquid outlet and the second liquid inlet are communicated, the battery pack loop and the motor cooling loop are in a parallel state and are independent of each other. The battery pack loop implements cooling circulation for the power battery pack, and the motor cooling loop implements cooling circulation for the motor system 12.
When the first liquid inlet and the second liquid outlet of the four-way hydraulic valve are communicated and the first liquid outlet and the second liquid inlet are communicated, the battery pack loop and the motor cooling loop are in a serial connection state to form a complete cooling loop and share one set of cooling system. And heat generated by the output current of the motor system is transferred to the battery pack loop through the motor cooling loop so as to heat the power battery pack.
In the embodiment of the utility model, two heating modes of the power battery pack are supplemented, so that the energy of the whole system is fully utilized, the energy utilization rate is improved, and the heating rate of the power battery pack is increased. Under the low-temperature charging scene, the charging time can be effectively shortened, and the safety performance of the vehicle is effectively improved.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the utility model.

Claims (6)

1. A power battery system, comprising: the system comprises a power battery pack, a motor system and a cooling loop; the motor system comprises a motor controller and a driving motor;
the power battery pack is connected with the motor controller, and the driving motor is connected with the motor controller; the D-axis current of the driving motor is a sinusoidal current output by the power battery pack;
the power battery pack is circularly connected with the cooling loop, and the motor system is circularly connected with the cooling loop.
2. The power battery system of claim 1, wherein the cooling circuit comprises a battery pack circuit, a motor cooling circuit, and a switching element;
the power battery pack is circularly connected with the battery pack loop, the motor system is circularly connected with the motor cooling loop, and the battery pack loop is communicated or disconnected with the motor cooling loop through the switch element.
3. The power cell system of claim 2, wherein the switching element is a four-way hydraulic valve; the heat input end of the battery pack loop is connected with a first liquid outlet of the four-way hydraulic valve, and the cold output end of the battery pack loop is connected with a first liquid inlet of the four-way hydraulic valve; the cold quantity input end of the motor cooling loop is connected with the second liquid outlet of the four-way hydraulic valve, and the heat quantity output end of the motor cooling loop is connected with the second liquid inlet of the four-way hydraulic valve.
4. The power battery system of claim 2, wherein the coolant in the battery pack loop and the motor cooling loop is cooling water.
5. The power battery system of claim 2, further comprising a heater coupled to the cold output of the battery pack loop.
6. A vehicle, characterized in that it comprises a power battery system according to any of claims 1 to 5.
CN202121995272.1U 2021-08-23 2021-08-23 Power battery system and vehicle Active CN216424147U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202121995272.1U CN216424147U (en) 2021-08-23 2021-08-23 Power battery system and vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202121995272.1U CN216424147U (en) 2021-08-23 2021-08-23 Power battery system and vehicle

Publications (1)

Publication Number Publication Date
CN216424147U true CN216424147U (en) 2022-05-03

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Application Number Title Priority Date Filing Date
CN202121995272.1U Active CN216424147U (en) 2021-08-23 2021-08-23 Power battery system and vehicle

Country Status (1)

Country Link
CN (1) CN216424147U (en)

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Effective date of registration: 20240222

Granted publication date: 20220503