CN113650486A - Self-heating method and device for vehicle battery - Google Patents

Self-heating method and device for vehicle battery Download PDF

Info

Publication number
CN113650486A
CN113650486A CN202111033087.9A CN202111033087A CN113650486A CN 113650486 A CN113650486 A CN 113650486A CN 202111033087 A CN202111033087 A CN 202111033087A CN 113650486 A CN113650486 A CN 113650486A
Authority
CN
China
Prior art keywords
battery
value
heating
current
self
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202111033087.9A
Other languages
Chinese (zh)
Inventor
陈长红
孙纯哲
龚晓峰
庄朝晖
王俊文
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Evergrande Hengchi New Energy Automobile Research Institute Shanghai Co Ltd
Original Assignee
Evergrande Hengchi New Energy Automobile Research Institute Shanghai Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Evergrande Hengchi New Energy Automobile Research Institute Shanghai Co Ltd filed Critical Evergrande Hengchi New Energy Automobile Research Institute Shanghai Co Ltd
Priority to CN202111033087.9A priority Critical patent/CN113650486A/en
Publication of CN113650486A publication Critical patent/CN113650486A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K1/00—Arrangement or mounting of electrical propulsion units
    • 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
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K1/00—Arrangement or mounting of electrical propulsion units
    • B60K2001/008—Arrangement or mounting of electrical propulsion units with means for heating the electrical propulsion units
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Secondary Cells (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The invention provides a self-heating method and a device for a vehicle battery, wherein the method comprises the following steps: outputting a periodic signal of a set frequency to a vehicle battery self-heating device in response to a request signal for heating a battery; an LC oscillation unit in the vehicle battery self-heating device is connected with a battery; the periodic signal comprises a first electric signal and a second electric signal which are alternated, and the first electric signal controls the LC oscillating unit to form a charging loop with the battery; the second electric signal controls the LC oscillating unit and the battery to form a discharging loop; the set frequency is greater than a resonance frequency of the LC oscillating unit. The scheme of the invention is adopted to carry out self-heating on the battery, no additional PTC heater is needed, the structure of the battery system is simplified, and the cost is reduced.

Description

Self-heating method and device for vehicle battery
Technical Field
The invention relates to the technical field of vehicle battery temperature control, in particular to a vehicle battery self-heating method and device.
Background
The new energy automobile taking electric energy as a main power source has the advantages of zero emission, low noise, low traveling cost and the like, is more and more widely applied, and becomes the main direction of automobile development in the future. However, since the performance of the vehicle battery is degraded in a low-temperature environment, the driving range and the power performance of the vehicle are restricted, which is particularly obvious in winter.
Currently, a ptc (positive Temperature coefficient) heater is used to heat a vehicle battery. A PTC heater and a circulating water path that can exchange heat with a vehicle battery are installed in a vehicle. When the ambient temperature is lower, the PTC heater heats the circulating water path, and the heat transfer between the vehicle battery and the circulating water path is realized to heat the vehicle battery. This scheme needs to add the PTC heater in addition, leads to vehicle structure complicacy, the cost increase, and the heating mode through heat transfer is slow to carry out the heating rate to the battery, and is inefficient.
Disclosure of Invention
The invention aims to provide a vehicle battery self-heating method and a vehicle battery self-heating device, and aims to solve the technical problems of complex structure, high cost and low heating efficiency of a vehicle battery heating scheme in the prior art.
To this end, a part of embodiments of the present invention provide a vehicle battery self-heating method, including the steps of:
outputting a periodic signal of a set frequency to a vehicle battery self-heating device in response to a request signal for heating a battery; an LC oscillation unit in the vehicle battery self-heating device is connected with a battery; the periodic signal comprises a first electric signal and a second electric signal which are alternated, and the first electric signal controls the LC oscillating unit to form a charging loop with the battery; the second electric signal controls the LC oscillating unit and the battery to form a discharging loop; the set frequency is greater than a resonance frequency of the LC oscillating unit.
In some embodiments of the present invention, in the method for self-heating a vehicle battery, the step of outputting a periodic signal with a set frequency to the self-heating device for a vehicle battery includes:
the difference between the set frequency and the resonant frequency is less than a frequency adjustment threshold.
The vehicle battery self-heating method provided in some embodiments of the present invention further includes, before responding to a request signal for heating the battery:
acquiring a battery temperature value at the current moment, and acquiring a battery SOC value at the current moment;
and if the temperature value is lower than a set temperature threshold value and the SOC value is lower than a set SOC threshold value, generating a request signal for heating the battery.
In some embodiments of the present invention, the step of outputting a periodic signal with a set frequency to a vehicle battery self-heating device includes:
determining a battery temperature change value according to a difference value between the temperature value and a preset target temperature value;
determining the heating rate of the battery according to the temperature change value and the heating time length of the battery;
and determining the set frequency according to the battery heating rate and the current value of the internal oscillation current of the battery.
In the method for self-heating a vehicle battery according to some embodiments of the present invention, in the step of determining the set frequency based on the battery heating rate and the current value of the battery internal oscillation current, the current value of the battery internal oscillation current is determined by:
determining an oscillation current amplitude according to the charging and discharging voltage of the battery;
and determining a current effective value according to the amplitude of the oscillation current, and taking the current effective value as a current value of the oscillation current in the battery.
Based on the same inventive concept, some embodiments of the present invention further provide a vehicle battery self-heating apparatus, including an oscillation circuit and a controller:
the oscillation circuit comprises an LC oscillation unit, a first switch component and a second switch component; the LC oscillating unit is connected with a battery through the first switch component to form a charging loop; the LC oscillating unit is connected with a battery through the second switch component to form a discharging loop;
the controller outputs a periodic signal with a set frequency after responding to a request signal of the heating battery so as to control the first switch component and the second switch component to be alternately conducted according to the set frequency respectively to enable the interior of the battery to generate oscillation current; the set frequency is greater than a resonance frequency of the LC oscillating unit.
In some embodiments of the present invention, there is provided the vehicle battery self-heating apparatus, wherein a difference between the set frequency and the resonance frequency is smaller than a frequency adjustment threshold.
In some embodiments of the present invention, there is provided a vehicle battery self-heating apparatus, wherein the oscillation circuit further includes a first fuse and/or a second fuse:
the first fuse is connected in the charging loop in series, and is fused when the current value of the charging loop is greater than a first set threshold value;
the second fuse is connected in the discharge loop in series, and the second fuse is fused when the current value of the discharge loop is larger than a second set threshold value.
In some embodiments of the present invention, the oscillation circuit and the battery are disposed inside the battery pack case.
In some embodiments of the present invention, there is provided a vehicle battery self-heating apparatus, wherein the oscillation circuit is connected between a battery and a vehicle-mounted main relay; the main relay includes:
a positive relay connected between the positive terminal of the battery and the load, and a negative relay connected between the negative terminal of the battery and the load.
A vehicle battery self-heating apparatus provided in some embodiments of the present invention further includes:
the temperature sensor is used for monitoring the temperature value of the battery and sending the temperature value to the controller;
the battery SOC value sensor is used for monitoring a battery SOC value and sending the SOC value to the controller;
the controller generates the request signal for heating the battery when the temperature value is lower than a set temperature threshold and the SOC value is lower than a set SOC threshold.
In some embodiments of the present invention, there is provided a vehicle battery self-heating apparatus, wherein the oscillation circuit includes:
the first switch assembly comprises two switch transistors in a first set of legs of the rectifier bridge and the second switch assembly comprises two switch transistors in a second set of legs of the rectifier bridge; the heating signal output by the controller is a square wave pulse signal.
In some embodiments of the vehicle battery self-heating apparatus provided by the present invention, the controller determines a battery temperature variation value according to a difference between the temperature value at the present time and a preset target temperature value, determines a battery heating rate according to the battery temperature variation value and a heating duration, and determines the set frequency according to the battery heating rate and a current value of an oscillation current in the battery.
In the self-heating apparatus for a vehicle battery according to some embodiments of the present invention, the controller determines the current value of the internal oscillation current of the battery by:
determining an oscillation current amplitude according to the charging and discharging voltage of the battery, determining a current effective value according to the oscillation current amplitude, and taking the current effective value as the current value of the oscillation current in the battery.
Some embodiments of the invention also provide a vehicle, which comprises the vehicle battery self-heating device in any one of the above embodiment modes.
Compared with the prior art, the technical scheme provided by the embodiment of the invention at least has the following beneficial effects: according to the battery self-heating method and device, the charging and discharging frequency between the LC oscillating unit and the battery in the vehicle battery self-heating device is controlled, so that the effective value of the oscillating current in the battery in one period is obviously improved, and when the oscillating current acts on the internal resistance of the battery, higher power can be generated in the same time length, and the battery can be heated more quickly. Moreover, the battery is heated by the battery self-heating method without additionally adding a PTC heater, so that the structure of a battery system is simplified, the cost is reduced, and meanwhile, the battery self-heating mode has higher heating efficiency and better uniformity.
Drawings
FIG. 1 is a flow chart of a method for self-heating a vehicle battery according to an embodiment of the invention;
FIG. 2 is a flow chart of a method for self-heating a vehicle battery according to another embodiment of the present invention;
FIG. 3 is a schematic block diagram of a vehicle battery self-heating apparatus according to an embodiment of the present invention;
fig. 4 is a schematic structural view of a vehicle battery self-heating device according to an embodiment of the invention;
fig. 5 is a schematic structural view of a vehicle battery self-heating apparatus according to another embodiment of the invention;
FIG. 6 is a schematic diagram of a waveform with a set frequency less than the resonant frequency of the LC tank according to an embodiment of the present invention;
FIG. 7 is a schematic waveform diagram of a square-wave pulse signal and a schematic waveform diagram of an oscillating current inside a battery in a self-heating device for a vehicle battery according to an embodiment of the present invention;
fig. 8 is a schematic block diagram of a vehicle battery self-heating apparatus according to another embodiment of the present invention;
fig. 9 is a schematic diagram of the connection relationship of the hardware structure for executing the self-heating method of the vehicle battery according to an embodiment of the invention.
Detailed Description
The embodiments of the present invention will be further described with reference to the accompanying drawings. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description of the present invention, and do not indicate or imply that the device or assembly referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, and the two components can be communicated with each other. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. The technical solutions in the following embodiments provided in the present invention may be combined with each other unless contradictory to each other, and the technical features thereof may be replaced with each other.
The embodiment provides a vehicle battery self-heating method, which can be applied to a battery management system of a vehicle, and as shown in fig. 1, the method can include:
and S1, responding to the request signal for heating the battery. The request signal may be generated by manually triggering a control component on the vehicle, or may be generated by the battery management system by collecting information such as the ambient temperature of the vehicle and the temperature of the battery and judging that the battery needs to be heated.
S2: and outputting a periodic signal with a set frequency to the vehicle battery self-heating device. The LC oscillating unit in the vehicle battery self-heating device is connected with a battery; the periodic signal comprises a first electric signal and a second electric signal which are alternated, and the first electric signal controls the LC oscillating unit to form a charging loop with the battery; the second electric signal controls the LC oscillating unit and the battery to form a discharging loop; the set frequency is greater than a resonance frequency of the LC oscillating unit.
In the scheme, the charging and discharging frequency between the LC oscillating unit and the battery in the self-heating device of the vehicle battery is controlled, so that the effective value of the oscillating current in the battery in one period is obviously improved, and when the oscillating current acts on the internal resistance of the battery, higher power can be generated in the same time length, and the battery can be heated more quickly. Moreover, the battery is heated by the battery self-heating method without additionally adding a PTC heater, so that the structure of a battery system is simplified, the cost is reduced, and meanwhile, the battery self-heating mode has higher heating efficiency and better uniformity.
In some embodiments, the difference between the set frequency and the resonant frequency is less than a frequency adjustment threshold. In a specific application scenario, the frequency adjustment threshold can be determined according to the battery internal resistance Rn, and the capacitance and inductance value in the LC oscillation unit. The purpose of this scheme is, avoid setting for the frequency too big, lead to in the oscillation process, electric energy storage volume in the LC oscillation unit is too big, brings unstable factor for battery voltage, and through with set for the frequency with the difference between the resonant frequency is less than the frequency adjustment threshold value, can ensure that the electric energy in the LC oscillation unit is in time released in the oscillation process, ensures battery voltage's stability.
In some embodiments, as shown in fig. 2, the controller determines whether the battery needs to be self-heated according to the following control logic:
s101: and acquiring a battery temperature value and a battery SOC value at the current moment. The temperature sensor or the voltage sensor can be used for acquiring signals, and the battery temperature value and the battery SOC value can be determined according to the acquisition result of the sensor.
S102: and judging whether the temperature value is lower than a set temperature threshold value, if so, executing the step S3, otherwise, executing the step S5, wherein the set temperature threshold value can be set according to specific application scenarios and vehicle types, for example, the set temperature threshold value is selected to be 0 ℃, 5 ℃ and the like.
S103: and judging whether the SOC value is lower than a set SOC threshold value, if so, executing step S4, otherwise, executing step S5, wherein the set SOC threshold value may be set according to specific application scenarios and vehicle types, for example, 20%, 30%, and the like are selected.
S104: generating the request signal for heating the battery.
S105: the heating is withdrawn. Namely, the battery is self-heated when the temperature value is lower than the set temperature threshold value and the SOC value is lower than the set SOC threshold value, otherwise, the heating operation is not required to be executed.
In some embodiments, the set frequency may be determined by:
s201: and determining a battery temperature change value according to the difference value between the temperature value at the current moment and a preset target temperature value.
S202: and determining the heating rate of the battery according to the temperature change value and the heating time length of the battery.
S203: and determining the set frequency according to the battery heating rate and the current value of the internal oscillation current of the battery.
The heating time period can be set according to the general use habits of the vehicle, for example, the self-heating time period of the battery after the vehicle is started is 3-5 minutes, then the vehicle can be driven, and the heating time period can be set to 4 minutes. The preset target temperature value can be selected as long as the temperature value corresponding to the normal performance of the battery can be recovered. The heating rate can be determined when the heating time period and the temperature change value are determined. As shown in the following formula, the temperature rise rate of the battery is mainly determined by the effective value of the oscillating current, and the effective value of the sinusoidal current has a direct relation with the amplitude value:
Figure BDA0003246135280000071
IRMSis a significant value, IpeakIs the peak current value, namely the amplitude value, of the sinusoidal current.
Due to IpeakThe temperature rise rate of the temperature-raising battery cannot be realized by simply depending on a method for raising the amplitude of the oscillation current under the condition that the temperature cannot be too large due to the limitation of the charging and discharging voltage of the battery. Therefore, the scheme of the embodiment determines the current value of the internal oscillation current of the battery by the following method: according to the battery chargingAnd determining the amplitude of the oscillation current according to the discharge voltage, determining the effective value of the current according to the amplitude of the oscillation current, and taking the effective value of the current as the current value of the oscillation current in the battery. Therefore, the amplitude of the oscillating current can meet the requirement of the charging and discharging voltage of the battery. Referring to fig. 3, for the sine wave oscillating current, the current effective value (which can be regarded as the waveform area per unit time length) of the original waveform is smaller than the current effective value improved by the present scheme (since the improved scheme cuts off the portions of the small current values near the two time end points of the sine wave oscillating current, the waveform area per unit time length is increased). Through the optimization mode of the scheme, the effective value of the oscillating current in the battery is improved, and the self-heating rate of the battery is greatly improved. Some embodiments of the present invention provide a vehicle battery self-heating apparatus, as shown in fig. 4 to 6, for heating a battery 10, which may include an oscillation circuit 20 and a controller 30. The oscillation circuit 20 includes an LC oscillation cell, a first switching element (transistor G2 and transistor G3), and a second switching element (transistor G1 and transistor G4); the LC oscillating unit is connected with a battery 10 through the first switch component to form a charging loop; the LC oscillating unit is connected with the battery 10 through the second switch component to form a discharging loop; the controller 30 outputs a periodic signal of a set frequency to control the first switching assembly and the second switching assembly to be alternately turned on at a set frequency (i.e., 1/T') to generate an oscillating current inside the battery 10, respectively, after responding to a request signal to heat the battery; as shown in fig. 4, the set frequency is greater than the resonant frequency (i.e. 1/T) of the LC oscillating unit, i.e. the original oscillation period of the LC oscillating unit in the figure is T, and the period corresponding to the set frequency is T ', T > T ', and 1/T ' > 1/T. The waveforms shown in the figure are represented on the ordinate by the current magnitude and on the abscissa by the time.
In the scenario of the above embodiment, it can be determined in conjunction with fig. 5 and 6 that: the battery 10 has an internal battery resistance Rn therein, and also has a line inductance Lx and a line resistance Rx, which are necessarily determined by the structure of the battery itself. On the basis, if an oscillating current is generated inside the battery 10, the oscillating current is applied to the batteryOn the internal resistance Rn, the internal resistance Rn of the battery can spontaneously generate heat according to the law of conservation of energy, thereby realizing self-heating of the battery 10. As shown in fig. 3, normally, since the frequency of the oscillation current provided by the LC oscillation cell should be 1/T, it can be obtained according to the resonant frequency calculation formula of the LC oscillation cell:
Figure BDA0003246135280000081
l is an inductance value in the LC oscillation unit, and C is a capacitance value in the LC oscillation unit. In the above scheme provided by this embodiment, as shown in fig. 3 and 7, by controlling the on-frequencies of the first switch component and the second switch component, the effective value of the oscillating current in one period can be obviously increased, and when the oscillating current obtained by using the above scheme acts on the internal resistance Rn of the battery, higher power can be generated in the same time length, so that the battery 10 can be heated more quickly. Moreover, the battery is heated by the battery self-heating method without additionally adding a PTC heater, so that the structure of a power system is simplified, the cost of vehicle manufacturing is reduced, and meanwhile, the battery self-heating mode has higher heating efficiency and better uniformity.
In some embodiments, the difference between the set frequency and the resonant frequency is less than a frequency adjustment threshold. In a specific application scenario, the frequency adjustment threshold can be determined according to the battery internal resistance Rn, and the capacitance and inductance value in the LC oscillation unit. The purpose of this scheme is, avoid setting for the frequency too big, lead to in the oscillation process, electric energy storage volume in the LC oscillation unit is too big, brings unstable factor for battery voltage, and through with set for the frequency with the difference between the resonant frequency is less than the frequency adjustment threshold value, can ensure that the electric energy in the LC oscillation unit is in time released in the oscillation process, ensures battery voltage's stability.
As shown in fig. 6, in some embodiments, the oscillating circuit 20 further includes a first fuse S1 and/or a second fuse S2, which is illustrated as including two fuses at the same time. The first fuse S1 is connected in series in the charging loop, and the first fuse S1 blows when the current value of the charging loop is larger than a first set threshold value; the second fuse S2 is connected in series in the discharging loop, and the second fuse S2 blows when the current value of the discharging loop is larger than a second set threshold value. The main functions of the first fuse S1 and the second fuse S2 are to effectively prevent the risk of a short circuit occurring due to a failure of a component. Such as: when the transistor G1 and the transistor G3 are short-circuited due to faults, the first fuse S1 is burnt out due to the excessive current, and the safety of the battery is protected.
In some embodiments, the vehicle battery self-heating apparatus is shown in fig. 5, and the oscillation circuit 20 is connected between the battery 10 and an on-vehicle main relay; the main relay includes a positive relay J1 connected between the positive terminal of the battery and the load, and a negative relay J-connected between the negative terminal of the battery and the load. Alternatively, as shown in fig. 6, the oscillation circuit 20 is provided inside the battery pack case 100 together with the battery. In the above scheme, either the oscillation circuit 20 is added in the battery pack case 100 or the oscillation circuit 20 is added between the battery 10 and the main relay, the oscillation circuit 20 generates periodic oscillation current to act on the internal resistance of the battery, the battery temperature is increased due to the power loss of the internal resistance of the battery, and the oscillation circuit 20 is added in front of the main relay, so that the main relay can be prevented from being damaged by the oscillation current.
In the above solution, the first switching component and the second switching component in the oscillating circuit 20 can be implemented in various forms. As mentioned above, the first switch assembly in the embodiment of the present invention includes two switch transistors in the first set of legs of the rectifier bridge, and the second switch assembly includes two switch transistors in the second set of legs of the rectifier bridge. As shown in fig. 7, the heating signal output by the controller 30 is a square wave pulse signal. The square wave pulse signal controls the first switch component to be switched on and simultaneously controls the second switch component to be switched off, and the square wave pulse signal controls the first switch component to be switched off and simultaneously controls the second switch component to be switched off. Comparing the waveform of the oscillating current in fig. 7, when the battery needs to be self-heated, before the vehicle runs, the on/off of the first switch assembly and the second switch assembly is controlled by taking Tac as a period, so that the periodic sinusoidal-like oscillating current is generated inside the battery, the battery is heated, and the battery is heated to the target temperature within a certain time. Wherein the oscillating current satisfies the following formula:
Figure BDA0003246135280000101
Figure BDA0003246135280000102
σ＝Rn/2L；
Figure BDA0003246135280000103
the meaning of each parameter in the above formula is:
iL: an inductive current; i.e. iCA capacitance current; rn: the internal resistance of the battery; c: a capacitance value; l: an inductance value; u shapeC0: a capacitor starting voltage; u shapeocv: a battery short voltage; i.e. iBatOscillating current inside the battery; ω: the frequency is set.
The heat generated by the oscillating current and the temperature change value of the battery satisfy the following relational expression:
Ploss-Hout＝CMΔt；
Ploss＝iBat 2×Rn；
the meaning of each parameter in the above formula is:
Plossloss of internal resistance of the battery; hout: the heat dissipation power of the battery; c: specific heat capacity; m: the mass of the battery monomer; Δ t: and the temperature change value is the difference value between the temperature value at the current moment and a preset target temperature value.
In some embodiments of the present invention, as shown in fig. 8, the vehicle battery self-heating apparatus further includes a temperature sensor 40 and a battery SOC value sensor 50. The temperature sensor 40 is configured to monitor a temperature value of the battery 10 and send the temperature value to the controller 30; the battery SOC value sensor is configured to monitor a battery SOC value and send the SOC value to the controller 30. The controller 30 self-heats the battery when the temperature value is lower than the set temperature threshold and the SOC value is lower than the set SOC threshold, otherwise, the first switch assembly and the second switch assembly may be controlled to keep an off state, and no oscillating current is generated inside the battery.
In some embodiments, the controller 30 is configured to perform: determining a battery temperature change value according to a difference value between the temperature value at the current moment and a preset target temperature value, determining a battery heating rate according to the battery temperature change value and the heating time, and determining the set frequency according to the battery heating rate and the current value of the internal oscillation current of the battery. The heating time period can be set according to the general use habit of the vehicle, for example, the self-heating time period of the battery is allowed to be 3-5 minutes after the vehicle is started, then the vehicle can be driven, and the heating time period can be set to be 4 minutes. The preset target temperature value can be selected as long as the temperature value corresponding to the normal performance of the battery can be recovered. The heating rate can be determined when the heating time period and the temperature change value are determined. As shown in the following formula, the temperature rise rate of the battery is mainly determined by the effective value of the oscillating current, and the effective value of the sinusoidal current has a direct relation with the amplitude value:
Figure BDA0003246135280000111
IRMSis a significant value, IpeakIs the peak current value, i.e. amplitude, of a sinusoidal currentpeakThe temperature rise rate of the temperature-raising battery cannot be realized by simply depending on a method for raising the amplitude of the oscillation current under the condition that the temperature cannot be too large due to the limitation of the charging and discharging voltage of the battery. Therefore, the controller 30 determines the current value of the battery internal oscillation current by: determining an oscillation current amplitude according to the charging and discharging voltage of the battery, determining a current effective value according to the oscillation current amplitude, and taking the current effective value as the current value of the oscillation current in the battery. Thus enabling oscillationThe amplitude of the current meets the requirement of the charging and discharging voltage of the battery. Referring to fig. 3, for the sine wave oscillating current, the current effective value (which can be regarded as the waveform area per unit time length) of the original waveform is smaller than the current effective value improved by the present scheme (since the improved scheme cuts off the portions of the small current values near the two time end points of the sine wave oscillating current, the waveform area per unit time length is increased). Through the optimization mode of the scheme, the effective value of the oscillating current in the battery is improved, and the self-heating rate of the battery is greatly improved.
Some embodiments of the present application provide a readable storage medium, where program instructions are stored in the storage medium, and a computer reads the program instructions and executes the method for self-heating a vehicle battery according to any one of the method embodiments in the foregoing embodiments.
Fig. 9 is a schematic diagram of a hardware structure of a system for performing a self-heating method of a vehicle battery according to this embodiment, where the system includes one or more processors 601 and a memory 602, and one processor 601 is taken as an example in fig. 9. The system may further comprise: an input device 603 and an output device 604. The processor 601, the memory 602, the input device 603 and the output device 604 may be connected by a bus or other means, and fig. 9 illustrates the connection by a bus as an example.
The memory 602, which is a non-volatile computer-readable storage medium, may be used to store non-volatile software programs, non-volatile computer-executable programs, and modules. The processor 601 executes various functional applications of the server and data processing by running nonvolatile software programs, instructions and modules stored in the memory 602, that is, implements the vehicle battery self-heating method of the above-described method embodiment. The system can execute the method provided by the embodiment of the application, and has the corresponding functional modules and beneficial effects of the execution method. For technical details that are not described in detail in this embodiment, reference may be made to the methods provided in the embodiments of the present application.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
The invention also provides a vehicle which takes a battery as a main power source or takes the battery as an auxiliary power source, wherein the device for heating the battery adopts the vehicle battery self-heating device in any one of the embodiments. According to the vehicle provided by the embodiment, the oscillating circuit is additionally arranged between the battery and the main relay, the main relay is prevented from being damaged by oscillating current, meanwhile, the oscillating current generated by the oscillating circuit is not limited by the main relay, the effective value of the oscillating current can be improved, and the self-heating rate of the battery is improved. Moreover, the battery in the vehicle adopts a self-heating mode, a PTC heater is omitted, the vehicle structure is simplified, and the cost of the whole vehicle is reduced. Because the fuse is added in the oscillating circuit, the short circuit of the heating device caused by the failure or the fault of the component is effectively prevented, and the safety of the system is protected. According to the heating device in the embodiment of the invention, the waveform of the oscillating current is adjusted by adjusting the on-off frequency of each switch in the oscillating circuit, so that the effective value of the current oscillating current is increased, and the heating efficiency of the battery is improved.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. A vehicle battery self-heating method, characterized by comprising the steps of:
outputting a periodic signal of a set frequency to a vehicle battery self-heating device in response to a request signal for heating a battery; an LC oscillation unit in the vehicle battery self-heating device is connected with a battery; the periodic signal comprises a first electric signal and a second electric signal which are alternated, and the first electric signal controls the LC oscillating unit to form a charging loop with the battery; the second electric signal controls the LC oscillating unit and the battery to form a discharging loop; the set frequency is greater than a resonance frequency of the LC oscillating unit.
2. The vehicle battery self-heating method according to claim 1, characterized in that in the step of outputting a periodic signal of a set frequency to the vehicle battery self-heating device:
the difference between the set frequency and the resonant frequency is less than a frequency adjustment threshold.
3. The vehicle battery self-heating method according to claim 1, characterized by further comprising, before responding to the request signal to heat the battery:
acquiring a battery temperature value at the current moment, and acquiring a battery SOC value at the current moment;
and if the temperature value is lower than a set temperature threshold value and the SOC value is lower than a set SOC threshold value, generating a request signal for heating the battery.
4. The vehicle battery self-heating method according to claim 3, wherein the step of outputting a periodic signal of a set frequency to the vehicle battery self-heating apparatus includes:
determining a battery temperature change value according to a difference value between the temperature value and a preset target temperature value;
determining the heating rate of the battery according to the temperature change value and the heating time length of the battery;
and determining the set frequency according to the battery heating rate and the current value of the internal oscillation current of the battery.
5. The vehicle battery self-heating method according to claim 4, characterized in that in the step of determining the set frequency from the battery heating rate and the current value of the battery internal oscillation current, the current value of the battery internal oscillation current is determined by:
determining an oscillation current amplitude according to the charging and discharging voltage of the battery;
and determining a current effective value according to the amplitude of the oscillation current, and taking the current effective value as a current value of the oscillation current in the battery.
6. A vehicle battery self-heating device, characterized by comprising an oscillation circuit and a controller:
the oscillation circuit comprises an LC oscillation unit, a first switch component and a second switch component; the LC oscillating unit is connected with a battery through the first switch component to form a charging loop; the LC oscillating unit is connected with a battery through the second switch component to form a discharging loop;
the controller outputs a periodic signal with a set frequency after responding to a request signal of the heating battery so as to control the first switch component and the second switch component to be alternately conducted according to the set frequency respectively to enable the interior of the battery to generate oscillation current; the set frequency is greater than a resonance frequency of the LC oscillating unit.
7. The vehicle battery self-heating apparatus according to claim 6, characterized in that:
the oscillating circuit further comprises a first fuse and/or a second fuse:
the first fuse is connected in the charging loop in series, and is fused when the current value of the charging loop is greater than a first set threshold value;
the second fuse is connected in the discharge loop in series, and the second fuse is fused when the current value of the discharge loop is larger than a second set threshold value.
8. The vehicle battery self-heating apparatus according to claim 6, characterized in that:
the oscillating circuit and the battery are arranged in the battery pack shell together.
9. The vehicle battery self-heating apparatus according to claim 6, characterized in that:
the oscillating circuit is connected between the battery and the vehicle-mounted main relay; the main relay includes:
a positive relay connected between the positive terminal of the battery and the load, and a negative relay connected between the negative terminal of the battery and the load.
10. The vehicle battery self-heating apparatus according to any one of claims 6 to 9, characterized by further comprising:
the temperature sensor is used for monitoring the temperature value of the battery and sending the temperature value to the controller;
the battery SOC value sensor is used for monitoring a battery SOC value and sending the SOC value to the controller;
the controller generates the request signal for heating the battery when the temperature value is lower than a set temperature threshold and the SOC value is lower than a set SOC threshold.
CN202111033087.9A 2021-09-03 2021-09-03 Self-heating method and device for vehicle battery Pending CN113650486A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111033087.9A CN113650486A (en) 2021-09-03 2021-09-03 Self-heating method and device for vehicle battery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111033087.9A CN113650486A (en) 2021-09-03 2021-09-03 Self-heating method and device for vehicle battery

Publications (1)

Publication Number Publication Date
CN113650486A true CN113650486A (en) 2021-11-16

Family

ID=78493516

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111033087.9A Pending CN113650486A (en) 2021-09-03 2021-09-03 Self-heating method and device for vehicle battery

Country Status (1)

Country Link
CN (1) CN113650486A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023087613A1 (en) * 2021-11-17 2023-05-25 蜂巢能源科技股份有限公司 Method for heating lithium ion battery, oscillating power supply, and battery management system
WO2023221037A1 (en) * 2022-05-19 2023-11-23 宁德时代新能源科技股份有限公司 Charging method, battery management system, battery, and charging device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107039708A (en) * 2016-11-29 2017-08-11 北京交通大学 A kind of Li-ion batteries piles low temperature self-heating method
CN109473752A (en) * 2018-09-25 2019-03-15 北京长城华冠汽车科技股份有限公司 A kind of heating means and heating device of the power battery of electric car
CN111284366A (en) * 2020-03-02 2020-06-16 山东汽车制造有限公司 Power battery charging heating circuit, control method thereof and electric automobile
CN211335652U (en) * 2019-10-09 2020-08-25 比亚迪股份有限公司 Vehicle and battery self-heating system thereof
CN113067056A (en) * 2021-03-23 2021-07-02 远景动力技术(江苏)有限公司 Battery heating method and device, electronic equipment and storage medium
US20210218085A1 (en) * 2020-01-15 2021-07-15 Ford Global Technologies, Llc Automotive battery heater

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107039708A (en) * 2016-11-29 2017-08-11 北京交通大学 A kind of Li-ion batteries piles low temperature self-heating method
CN109473752A (en) * 2018-09-25 2019-03-15 北京长城华冠汽车科技股份有限公司 A kind of heating means and heating device of the power battery of electric car
CN211335652U (en) * 2019-10-09 2020-08-25 比亚迪股份有限公司 Vehicle and battery self-heating system thereof
US20210218085A1 (en) * 2020-01-15 2021-07-15 Ford Global Technologies, Llc Automotive battery heater
CN111284366A (en) * 2020-03-02 2020-06-16 山东汽车制造有限公司 Power battery charging heating circuit, control method thereof and electric automobile
CN113067056A (en) * 2021-03-23 2021-07-02 远景动力技术(江苏)有限公司 Battery heating method and device, electronic equipment and storage medium

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023087613A1 (en) * 2021-11-17 2023-05-25 蜂巢能源科技股份有限公司 Method for heating lithium ion battery, oscillating power supply, and battery management system
WO2023221037A1 (en) * 2022-05-19 2023-11-23 宁德时代新能源科技股份有限公司 Charging method, battery management system, battery, and charging device

Similar Documents

Publication Publication Date Title
JP4530078B2 (en) Power storage control device and vehicle
CN113650486A (en) Self-heating method and device for vehicle battery
CN106450586B (en) A kind of power-supply system heated based on LC resonance and PTC resistor band and vehicle
EP3032695B1 (en) Battery control system and vehicle control system
JP2019140775A (en) On-vehicle charger and control method of on-vehicle charger
US20110231122A1 (en) Method and system for determining the kind of a battery
JP2017099057A (en) Battery system
CN113745700B (en) Electric automobile, heating method and device of power battery of electric automobile and storage medium
JP2002125326A (en) Battery charge control method
JP2006166615A (en) Voltage equalization control system of storage device
JP2021002511A (en) Smart battery device and charging method
CN111864282B (en) Remaining power correction method, power automobile and readable storage medium
CN111181208A (en) Charger integrated with alternating current heating function
JP2010041794A (en) Vehicle driving device
KR20180029890A (en) Vehicle
JP2000324702A (en) Method and apparatus for detecting discharge capacity of battery and controller for car battery
CN111525196A (en) Battery self-heating circuit, electric automobile adopting same and control method thereof
CN111293743B (en) Recharging device, method for operating a recharging device, and vehicle
CN114074571B (en) Vehicle charging method and device, storage medium and vehicle
WO2019184842A1 (en) Method and apparatus for calculating soc of power battery pack, and electric vehicle
JP2015202010A (en) Control device for storage battery
JP2016195495A (en) Secondary battery charging control device and secondary battery charging control method
JP7475769B2 (en) Battery resistance calculation device and method
CN113659244A (en) Preheating method and device for automobile battery pack
JP2014110715A (en) Battery system

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20211116