CN113725979A - Equalizing circuit for rechargeable battery, rechargeable battery system and electric vehicle - Google Patents

Equalizing circuit for rechargeable battery, rechargeable battery system and electric vehicle Download PDF

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Publication number
CN113725979A
CN113725979A CN202111111144.0A CN202111111144A CN113725979A CN 113725979 A CN113725979 A CN 113725979A CN 202111111144 A CN202111111144 A CN 202111111144A CN 113725979 A CN113725979 A CN 113725979A
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CN
China
Prior art keywords
battery
light
voltage
rechargeable battery
electrically connected
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Pending
Application number
CN202111111144.0A
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Chinese (zh)
Inventor
吴楠
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Tianjin Tianqi Group Co ltd
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Tianjin Tianqi Group Co ltd
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Priority to CN202111111144.0A priority Critical patent/CN113725979A/en
Publication of CN113725979A publication Critical patent/CN113725979A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H02J7/0014—Circuits for equalisation of charge between batteries
    • H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
    • 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
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/50—Charging stations characterised by energy-storage or power-generation means
    • B60L53/51—Photovoltaic means
    • 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
    • B60L58/22—Balancing the charge of battery modules
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
    • 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
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • 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
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/12—Electric charging stations

Abstract

The embodiment of the invention discloses an equalizing circuit for a rechargeable battery, a rechargeable battery system and an electric vehicle. Wherein, rechargeable battery includes: a plurality of battery cells; the equalization circuit includes: the light-emitting module is electrically connected with the rechargeable battery, detects that the voltage difference of any two battery units exceeds a first threshold voltage, and converts the electric energy of the battery units into light energy; and the photovoltaic cell receives light energy and converts the light energy into electric energy. The technical scheme of the embodiment of the invention can reduce the generation of heat, avoid the phenomenon that the equalization circuit generates a large amount of heat along with the increase of the capacity of the battery to form heat accumulation, cause the damage of equipment when the temperature exceeds the bearing limit, and simultaneously reduce the waste of energy.

Description

Equalizing circuit for rechargeable battery, rechargeable battery system and electric vehicle
Technical Field
The invention relates to the technical field of battery management, in particular to an equalizing circuit for a rechargeable battery, a rechargeable battery system and an electric vehicle.
Background
With the development of electric vehicles, the use of batteries as power units for electric vehicles is adopted by more and more enterprises. Since the amount of electricity provided by a single battery is limited, a battery pack is constructed by connecting a plurality of batteries in series. However, in the use process of the battery pack, due to factors such as inconsistent manufacturing quality of single batteries and inconsistent use environment of the battery pack, the problem of different loss speeds is easily caused, and therefore, the voltage of the battery pack needs to be balanced by the balancing circuit, so that the purpose of prolonging the service life is achieved.
When the voltage of one or more battery units in the battery pack is too high, the battery units need to be discharged, so that the voltage of the battery units is reduced, and therefore the voltage of each battery unit in the battery pack is balanced.
Disclosure of Invention
The embodiment of the invention provides an equalizing circuit for a rechargeable battery, a rechargeable battery system and an electric vehicle, wherein when the voltage difference between any two battery units exceeds a first threshold voltage or the voltage of the battery units exceeds a second threshold voltage, the battery units are discharged through a light-emitting module, electric energy is converted into light energy, the light energy emitted by the light-emitting module is recycled through a photovoltaic battery, so that the generation of heat is reduced, the phenomenon that the equalizing circuit generates a large amount of heat along with the increase of the battery capacity to form heat accumulation, the temperature of equipment is damaged when exceeding a bearing limit, and the waste of the energy is reduced.
In a first aspect, an embodiment of the present invention provides an equalizing circuit for a rechargeable battery, where the rechargeable battery includes a plurality of battery cells; the equalization circuit includes: the light-emitting module is electrically connected with the rechargeable battery, detects that the voltage difference of any two battery units exceeds a first threshold voltage, and converts the electric energy of the battery units into light energy; and the photovoltaic cell receives light energy and converts the light energy into electric energy.
Further, the light emitting module detects that the voltage difference between any two battery units exceeds a first threshold voltage, and converts the electric energy of the battery unit with the higher voltage in the two battery units into the light energy.
Furthermore, the photovoltaic cell receives light energy, converts the light energy into electric energy and feeds the electric energy back to the rechargeable battery.
Further, the equalizing circuit for a rechargeable battery further includes: and the input end of the voltage conversion circuit is electrically connected with the output end of the photovoltaic cell, the output end of the voltage conversion circuit is electrically connected with the rechargeable battery, and the voltage of the output end of the photovoltaic cell is boosted by the voltage conversion circuit and is output to the rechargeable battery. Further, the light emitting module includes at least one of: violet, red, green and blue light emitting diodes.
Further, the light emitting module includes a gallium nitride light emitting diode.
Further, the photovoltaic cell comprises at least one of: gallium arsenide, monocrystalline silicon, polycrystalline silicon, amorphous silicon, copper indium tin, copper indium gallium selenide, cadmium telluride, and polymer photovoltaic cells.
Further, the photovoltaic cell is a flexible photovoltaic cell. Further, the light emitting module includes: a triangular purple gallium nitride light emitting diode; the photovoltaic cell comprises a gallium arsenide photovoltaic cell. Further, the photovoltaic cell is opposite to the light emitting side of the light emitting module. Furthermore, the number of the light-emitting modules is multiple, and the light-emitting modules are electrically connected with the battery units in a one-to-one correspondence mode.
Furthermore, the equalizing circuit for the rechargeable battery further comprises a control module, a voltage detection module and switch modules, wherein the switch modules are arranged in one-to-one correspondence with the light emitting modules, and each switch module comprises a first end, a second end and a control end; the first end of the switch module is electrically connected with the first end of the corresponding light-emitting module, and the second end of the switch module and the second end of the corresponding light-emitting module are respectively electrically connected with the two ends of the corresponding battery unit; the voltage detection module is electrically connected with the plurality of battery units and is used for detecting the voltage at two ends of each battery unit; the control module is electrically connected with the voltage detection module, the control module is also electrically connected with the control end of the switch module, the control module calculates the voltage difference of the two battery units according to the voltages of any two battery units detected by the voltage detection module, and when the voltage difference exceeds a first threshold voltage, the control module controls the conduction of the first end and the second end of the switch module corresponding to the battery unit with larger voltage in the two battery units.
In a second aspect, an embodiment of the present invention further provides an equalizing circuit for a rechargeable battery, where the rechargeable battery includes a plurality of battery cells; the equalization circuit includes: the light-emitting module is electrically connected with the rechargeable battery, and converts the electric energy of the battery unit into light energy when detecting that the voltage of the battery unit exceeds a second threshold voltage; and the photovoltaic cell receives light energy and converts the light energy into electric energy.
Furthermore, the photovoltaic cell receives light energy, converts the light energy into electric energy and feeds the electric energy back to the rechargeable battery.
Further, the equalizing circuit for a rechargeable battery further includes: and the input end of the voltage conversion circuit is electrically connected with the output end of the photovoltaic cell, the output end of the voltage conversion circuit is electrically connected with the rechargeable battery, and the voltage of the output end of the photovoltaic cell is boosted by the voltage conversion circuit and is output to the rechargeable battery. Further, the light emitting module includes at least one of: violet, red, green and blue light emitting diodes. Further, the light emitting module includes a gallium nitride light emitting diode. Further, the photovoltaic cell comprises at least one of: gallium arsenide, monocrystalline silicon, polycrystalline silicon, amorphous silicon, copper indium tin, copper indium gallium selenide, cadmium telluride, and polymer photovoltaic cells. Further, the photovoltaic cell is a flexible photovoltaic cell. Further, the light emitting module includes: a triangular purple gallium nitride light emitting diode; the photovoltaic cell comprises a gallium arsenide photovoltaic cell. Further, the photovoltaic cell is opposite to the light emitting side of the light emitting module. Furthermore, the number of the light-emitting modules is multiple, and the light-emitting modules are electrically connected with the battery units in a one-to-one correspondence mode.
Further, the equalizing circuit for a rechargeable battery further includes: the control module, the voltage detection module and the switch modules are arranged in one-to-one correspondence to the light emitting modules, and each switch module comprises a first end, a second end and a control end; the first end of the switch module is electrically connected with the first end of the corresponding light-emitting module, and the second end of the switch module and the second end of the corresponding light-emitting module are respectively electrically connected with the two ends of the corresponding first battery unit; the voltage detection module is electrically connected with the plurality of battery units and is used for detecting the voltage at two ends of each battery unit; the control module is electrically connected with the voltage detection module, the control module is also electrically connected with the control end of the switch module, and when the voltage detection module detects that the voltage of the battery unit exceeds a second threshold voltage, the control module controls the first end and the second end of the switch module corresponding to the battery unit with the voltage exceeding the second threshold voltage to be conducted.
Further, the battery units are connected in series, the light emitting modules correspond to the battery units one to one, and the light emitting modules are connected in parallel with the corresponding battery units.
In a third aspect, an embodiment of the present invention further provides a rechargeable battery system, including: a rechargeable battery including a plurality of battery cells; the equalizing circuit comprises a photovoltaic cell and a light-emitting module, the light-emitting module is electrically connected with the rechargeable battery, the voltage difference of any two battery units is detected to exceed a first threshold voltage, and the light-emitting module converts the electric energy of the battery units into light energy; the photovoltaic cell receives light energy and converts the light energy into electrical energy.
The rechargeable battery system further comprises a shell, the plurality of battery units, the light-emitting module and the photovoltaic battery are located inside the shell, the photovoltaic battery is attached to the inner surface of the shell, and a reflecting material layer is arranged in an area, which is not covered by the photovoltaic battery, of the shell; the outer surface of the battery cell is provided with a layer of reflective material. Further, the layer of reflective material comprises a reflective lacquer. Further, the rechargeable battery system includes at least one of a lithium ion battery, a lithium polymer battery, a nickel hydrogen battery, a nickel cadmium battery, a nickel zinc battery, and a sodium sulfur battery.
In a fourth aspect, an embodiment of the present invention further provides a rechargeable battery system, including: a rechargeable battery including a plurality of battery cells; the equalizing circuit comprises a photovoltaic cell and a light-emitting module, the light-emitting module is electrically connected with the rechargeable battery, the voltage of the battery unit is detected to exceed a second threshold voltage, and the light-emitting module converts the electric energy of the battery unit into light energy; the photovoltaic cell receives light energy and converts the light energy into electric energy.
The rechargeable battery system further comprises a shell, the plurality of battery units, the light-emitting module and the photovoltaic battery are located inside the shell, the photovoltaic battery is attached to the inner surface of the shell, and a reflecting material layer is arranged in an area, which is not covered by the photovoltaic battery, of the shell; the outer surface of the battery cell is provided with a layer of reflective material. Further, the layer of reflective material comprises a reflective lacquer. Further, the rechargeable battery includes at least one of a lithium ion battery, a lithium polymer battery, a nickel hydrogen battery, a nickel cadmium battery, a nickel zinc battery, and a sodium sulfur battery.
In a fifth aspect, an embodiment of the present invention further provides an electric vehicle, including: motor drive circuit, motor and rechargeable battery system, wherein, rechargeable battery system includes: the equalizing circuit comprises a rechargeable battery and an equalizing circuit, wherein the rechargeable battery comprises a plurality of battery units; the equalizing circuit comprises a photovoltaic cell and a light-emitting module, the light-emitting module is electrically connected with the rechargeable battery, the voltage difference of any two battery units is detected to exceed a first threshold voltage, and the light-emitting module converts the electric energy of the battery units into light energy; the photovoltaic cell receives light energy and converts the light energy into electric energy; the motor driving circuit is electrically connected with the rechargeable battery system to drive the motor. Further, the motor is an alternating current motor, and the motor driving circuit comprises a booster circuit and a frequency converter.
In a sixth aspect, an embodiment of the present invention further provides an electric vehicle, including: motor drive circuit, motor and rechargeable battery system, wherein, rechargeable battery system includes: the equalizing circuit comprises a rechargeable battery and an equalizing circuit, wherein the rechargeable battery comprises a plurality of battery units; the equalizing circuit comprises a photovoltaic cell and a light-emitting module, the light-emitting module is electrically connected with the rechargeable battery, the voltage of the battery unit is detected to exceed a second threshold voltage, and the light-emitting module converts the electric energy of the battery unit into light energy; the photovoltaic cell receives light energy and converts the light energy into electric energy; the motor driving circuit is electrically connected with the rechargeable battery system to drive the motor.
Further, the motor is an alternating current motor, and the motor driving circuit comprises a booster circuit and a frequency converter.
According to the technical scheme of the embodiment of the invention, the light-emitting module is electrically connected with the battery units, and when the voltage difference of any two battery units exceeds a first threshold voltage, the light-emitting module converts the electric energy of the battery unit with higher voltage in the two battery units into the light energy; the photovoltaic cell receives light energy and converts the light energy into electric energy, namely, the battery unit with higher voltage can be discharged through the light emitting module, the electric energy is converted into light energy, the light energy emitted by the light emitting module is recycled through the photovoltaic cell and then recycled, so that the generation of heat is reduced, the phenomenon that a large amount of heat is generated by an equalizing circuit along with the increase of battery capacity is avoided, heat accumulation is formed, the temperature of equipment exceeds a bearing limit and is damaged, and meanwhile, the waste of energy is reduced.
Drawings
Fig. 1 is a schematic structural diagram of an equalizing circuit for a rechargeable battery according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another equalizing circuit for a rechargeable battery according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another equalizing circuit for a rechargeable battery according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another equalizing circuit for a rechargeable battery according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an equalizing circuit for a rechargeable battery according to another embodiment of the present invention;
fig. 6 is a schematic structural diagram of a rechargeable battery system according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another rechargeable battery system according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of an electric vehicle according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of another electric vehicle according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
The embodiment of the invention provides an equalizing circuit for a rechargeable battery. Fig. 1 is a schematic structural diagram of an equalizing circuit for a rechargeable battery according to an embodiment of the present invention. The rechargeable battery 10 includes a plurality of battery cells 200. The equalizing circuit 100 for a rechargeable battery includes:
the light emitting module 110, the light emitting module 110 is electrically connected with the rechargeable battery 10, detects that the voltage difference between any two battery units 200 exceeds a first threshold voltage, and converts the electric energy of the battery units 200 into light energy;
the photovoltaic cell 120 receives light energy and converts the light energy into electric energy.
When the voltage difference between the voltages of any two battery cells 200 is less than or equal to the first threshold voltage, the light emitting module 110 does not emit light. The battery unit 200 may include one or more battery cells; if the battery unit 200 includes a plurality of battery cells, the plurality of battery cells may be connected in series and/or in parallel. The light emitting module 110 may be any light emitting element to replace a power consumption resistor, and discharge the battery unit with higher voltage relative to other battery units, so as to convert the electric energy of the battery unit into light energy, rather than converting the electric energy into heat energy, so as to reduce the generation of heat, and avoid the formation of heat accumulation, which causes the temperature of the device to exceed the bearing limit and damage the device. The photovoltaic cell 120 converts the light energy emitted by the light emitting module 110 into electric energy, so that part of the energy can be recycled, and the waste of the energy is reduced. The electric energy generated by the photovoltaic cell 120 can be supplied to any component, such as a heat dissipation fan, and the photovoltaic cell 120 can be electrically connected to a heat dissipation fan to further improve the heat dissipation capability. Through the equalization effect of the equalization circuit, the voltages of the battery units in the plurality of battery units in the rechargeable battery are relatively close, so that the voltage difference of each battery unit 200 in the rechargeable battery 10 is relatively small, the problems of performance deterioration and service life reduction of the rechargeable battery 10 caused by the overlarge voltage difference of each battery unit 200 are solved, namely the good performance of the rechargeable battery 10 is ensured, and the service life of the rechargeable battery 10 is prolonged. Optionally, the first threshold voltage is equal to 0, when the voltage difference between any two battery units 200 is greater than 0, the light emitting module 110 converts the electric energy of one battery unit 200 of the two battery units 200 into the light energy until the voltage difference between the two battery units 200 is 0, so that the voltage difference between each battery unit 200 is finally 0, the voltages of each battery unit 200 in the rechargeable battery 10 are ensured to be equal, the voltages of each battery unit 200 are balanced and consistent, and the service life of the rechargeable battery 10 is prolonged.
In the equalizing circuit for a rechargeable battery provided in this embodiment, the light emitting module is electrically connected to the battery units, and when a voltage difference between any two battery units exceeds a first threshold voltage, the light emitting module converts electric energy of the battery units into light energy; the photovoltaic cell receives light energy and converts the light energy into electric energy, namely, the battery unit with higher voltage can be discharged through the light emitting module, the electric energy is converted into light energy, the light energy emitted by the light emitting module is recycled through the photovoltaic cell and then recycled, so that the generation of heat is reduced, the phenomenon that a large amount of heat is generated by an equalizing circuit along with the increase of battery capacity is avoided, heat accumulation is formed, the temperature of equipment exceeds a bearing limit and is damaged, and meanwhile, the waste of energy is reduced.
On the basis of the above technical solution, optionally, the light emitting module 100 detects that the voltage difference between any two battery units 200 exceeds the first threshold voltage, and converts the electric energy of the battery unit 200 with the higher voltage of the two battery units 200 into the light energy.
Specifically, if the light emitting module 100 detects that the voltage difference between any two battery units 200 exceeds the first threshold voltage, the electric energy of the battery unit 200 with the larger voltage in the two battery units 200 is converted into the light energy, so that the voltage difference between any two battery units 200 can be kept within the first threshold voltage, and further, the voltage difference between the battery units 200 in the whole rechargeable battery 10 is kept balanced, and the service life of the rechargeable battery 10 is prolonged.
Optionally, the photovoltaic cell 120 receives light energy, converts the light energy into electric energy, and feeds the electric energy back to the rechargeable battery 10; and then make the electric energy of being converted into light energy by recycle, the electric energy is recycled and also can reduce thermal production, avoids along with the increase of rechargeable battery capacity, equalizer circuit produces a large amount of heats, forms heat and piles up, causes the temperature of equipment to exceed and bears the limit and damage, reduces the waste of energy simultaneously.
On the basis of the above technical solution, optionally, the light emitting module 110 may include a light emitting diode. Optionally, the light emitting module 110 includes at least one of: violet, red, green and blue light emitting diodes. The light emitted by the leds of different colors has different wavelengths, and the shorter the wavelength, the higher the photon energy, the stronger the photovoltaic effect, and the higher the conversion efficiency of the photovoltaic cell 120. Optionally, the light emitting module 110 includes a gan light emitting diode, and the emitted light has a short wavelength and is violet. Optionally, the photovoltaic cell 120 includes at least one of: gallium arsenide, monocrystalline silicon, polycrystalline silicon, amorphous silicon, copper indium tin, copper indium gallium selenide, cadmium telluride, and polymer photovoltaic cells. The photovoltaic cells 120 of different materials have different absorption efficiencies for light of different wavelength bands. The light emitting diodes with higher energy conversion efficiency can be selected to reduce heat dissipation. The photovoltaic cell 120 and the light emitting diode are reasonably matched to improve the absorption efficiency of the photovoltaic cell 120, improve the recovery efficiency of energy and reduce the waste of energy.
Optionally, the light emitting module 110 includes: a triangular purple gallium nitride light emitting diode; photovoltaic cell 120 comprises a gallium arsenide photovoltaic cell. The energy conversion efficiency of the triangular purple gallium nitride light-emitting diode is high and can be maintained at more than 70%, and the energy conversion efficiency of the peak value of light emitted by the triangular purple gallium nitride light-emitting diode is 84%. The semiconductor wafer of the triangular purple gallium nitride light emitting diode may be shaped as a triangular prism. The absorption efficiency of the gallium arsenide photovoltaic cell under the spectrum of the purple light emitting diode (the wavelength is 395nm) is high and can reach more than 60%.
Alternatively, the light emitting module 110 may include one light emitting diode, and the light emitting module 110 may also include a plurality of light emitting diodes, which are connected in series and/or in parallel.
Optionally, the photovoltaic cell 120 is opposite to the light emitting side of the light emitting module 110, so that light is directly irradiated onto the photovoltaic cell 120 to improve the photoelectric conversion efficiency of the photovoltaic cell.
Optionally, fig. 2 is a schematic structural diagram of another equalizing circuit for a rechargeable battery according to an embodiment of the present invention, and on the basis of the foregoing embodiment, the equalizing circuit 100 for a rechargeable battery further includes: the input end In1 of the voltage conversion circuit 130 is electrically connected with the output end of the photovoltaic cell 120, the output end Out1 of the voltage conversion circuit 130 is electrically connected with the rechargeable battery 10, and the voltage conversion circuit 130 boosts the voltage at the output end of the photovoltaic cell 120 and outputs the boosted voltage to the rechargeable battery 10.
The electric energy converted by the photovoltaic cell 120 can be fed back to the rechargeable battery 10 through the voltage conversion circuit 130, so as to achieve the effect of isolated semi-active equalization, and the efficiency of energy feedback is about 42%. The voltage conversion circuit 130 may include a direct current to direct current (DC-DC) switching converter, such as a boost circuit.
Optionally, the photovoltaic cell 120 is a flexible photovoltaic cell, and can be bent and deformed, so that a large-area photovoltaic cell can be conveniently used to surround components such as a light emitting module, and can be conveniently integrated or assembled with components such as a light emitting module and a battery unit, so as to reduce the volume of the device. The flexible photovoltaic cell may be a thin film photovoltaic cell, which is small in volume.
With continued reference to fig. 2, optionally, the number of the light emitting modules 110 is plural, and the light emitting modules 110 are electrically connected to the battery cells 200 in a one-to-one correspondence. Optionally, the battery units 200 are connected in series, and when the voltage difference between any two battery units 200 exceeds a first threshold voltage, the light emitting module 110 electrically connected to the battery unit with the higher voltage of the two battery units 200 converts the electric energy of the battery unit 200 into light energy. The greater the number of battery cells 200, the greater the number of light emitting modules 110, the greater the heat reduction, and the greater the recovered energy. The voltage of each of the plurality of battery cells may be equalized by the equalizing action of the light emitting module 110.
It should be noted that in the equalizing circuit for a rechargeable battery provided in this embodiment, the number of the light emitting modules 110 may also be less than the number of the battery units 200, one part of the battery units 200 is electrically connected to the light emitting modules 110 in a one-to-one correspondence, and the other part of the battery units 200 is electrically connected to other types of discharging modules, for example, the other types of discharging modules may be resistors, that is, the other part of the battery units 200 may be electrically connected to discharging resistors, so as to achieve voltage equalization of each battery unit 200.
Optionally, fig. 3 is a schematic structural diagram of another equalizing circuit for a rechargeable battery according to an embodiment of the present invention, and on the basis of the foregoing embodiment, the equalizing circuit 100 for a rechargeable battery further includes: the light emitting module comprises a control module 160, a voltage detection module 150, and switch modules 140 arranged in one-to-one correspondence with the light emitting modules 110, wherein each switch module 140 comprises a first end N1, a second end N2, and a control end Ctrl;
the first end N1 of the switch module 140 is electrically connected to the first end of the corresponding light emitting module 110, and the second end N2 of the switch module 140 and the second end of the corresponding light emitting module 110 are electrically connected to two ends of the corresponding battery cell 200, respectively; the voltage detection module 150 is electrically connected to the plurality of battery cells 200, and the voltage detection module 150 detects voltages at both ends of each battery cell 200; the control module 160 is electrically connected to the voltage detection module 150, the control module 160 is electrically connected to the control terminal Ctr1 of the switch module 140, the control module 160 calculates a voltage difference between any two battery cells 200 according to the voltages of the two battery cells 200 detected by the voltage detection module 150, and when the voltage difference exceeds a first threshold voltage, the control module 160 controls the first terminal N1 and the second terminal N2 of the switch module 140 corresponding to the battery cell 200 with the higher voltage of the two battery cells 200 to be turned on.
When the control module 160 detects that the voltage difference between the two battery cells 200 exceeds the first threshold voltage, the first terminal N1 and the second terminal N2 of the switch module 140 electrically connected to the battery cell 200 with the higher voltage of the two battery cells 200 are controlled to be turned on, and the light emitting module 110 emits light to convert the electric energy of the battery cell 200 into light energy. The control module 160 calculates a voltage difference according to the voltages of any two battery cells 200 detected by the voltage detection module 150, and controls the first terminal N1 and the second terminal N2 of the switch module 140 corresponding to the two battery cells 100 to be turned off and the light emitting module 110 not to emit light when the voltage difference is less than or equal to the first threshold voltage.
Fig. 4 is a schematic structural diagram of another equalizing circuit for a rechargeable battery according to an embodiment of the present invention, wherein the switching module 140 may be a relay, a transistor, a MOS transistor, or the like. Illustratively, referring to fig. 4, the switch module 140 is a transistor. The voltage detection module 150 may be a voltage division module composed of two resistors, or a voltage hall sensor, etc. The voltage detection module 140 may include a plurality of voltage division modules, which are connected in parallel with the battery cells 200 in a one-to-one correspondence. The control module 160 may be implemented by software and/or hardware. The control module 160 may be a single chip or a Field-Programmable Gate Array (FPGA). The switch module 140 and the control module 160 may be integrated in an integrated chip, for example, the integrated chip may be of the type LTC6811, i.e., a multi-cell monitor. The number of the light emitting modules 110 may be multiple, the number of the switch modules 140 may be multiple, and the light emitting modules 110 and the switch modules 140 correspond to each other one by one.
It should be noted that fig. 3 only schematically illustrates the case where the rechargeable battery 10 includes two battery cells 200, and the rechargeable battery 10 may further include more battery cells 200, and the present invention is not limited in detail herein.
The embodiment of the invention provides a further equalizing circuit for a rechargeable battery. Continuing to refer to fig. 1, or fig. 2, wherein the rechargeable battery 10 includes a plurality of battery cells 200; the equalizing circuit 100 for a rechargeable battery includes: the photovoltaic cell 120 and the light emitting module 110, the light emitting module 110 is electrically connected to the rechargeable battery 10, and when the voltage of the battery unit 200 is detected to exceed a second threshold voltage, the electric energy of the battery unit 200 is converted into light energy; the photovoltaic cell 120 receives light energy and converts the light energy into electrical energy.
When the voltage of the battery cell 200 is less than the second threshold voltage, the battery cell 200 does not need to be discharged, and the light emitting module 110 does not emit light. It should be noted that the present embodiment is different from the above-described embodiments in that the discharge conditions of the battery cell 200 are different, and the discharge conditions of the above-described embodiments are as follows: when the voltage difference between any two battery units 200 exceeds a first threshold voltage, the light emitting module 110 converts the electric energy of the battery unit 200 with the higher voltage of the two battery units 200 into light energy; the discharge conditions of this example were: when the voltage of any battery cell 200 exceeds a second threshold voltage, the electric energy of the battery cell 200 with the voltage exceeding the second threshold voltage is converted into the light energy. The structures of the battery unit, the photovoltaic cell, the light emitting module, and the like in this embodiment are the same as or similar to the structures of the battery unit, the photovoltaic cell, the light emitting module, and the like in the above embodiments, and have the same or similar beneficial effects, and are not described herein again.
The technical scheme accessible light emitting module of this embodiment discharges to the higher battery unit of voltage, converts the electric energy into light energy to the light energy recovery who sends light emitting module through photovoltaic cell, and then recycles, in order to reduce thermal production, avoid along with the increase of battery capacity, equalizer circuit produces a large amount of heats, forms the heat and piles up, causes the temperature of equipment to exceed and bear the limit and damage, reduces the waste of energy simultaneously.
Optionally, the photovoltaic cell 120 receives light energy, converts the light energy into electric energy, and feeds the electric energy back to the rechargeable battery 10; and then make the electric energy of being converted into light energy by recycle, the electric energy is recycled and also can reduce thermal production, avoids along with the increase of rechargeable battery capacity, equalizer circuit produces a large amount of heats, forms heat and piles up, causes the temperature of equipment to exceed and bears the limit and damage, reduces the waste of energy simultaneously.
Optionally, on the basis of the foregoing embodiment, referring to fig. 2, the equalizing circuit 100 for charging a battery further includes: a voltage conversion circuit 130. The input end In1 of the voltage conversion circuit 130 is electrically connected with the output end of the photovoltaic cell 120, the output end Out1 of the voltage conversion circuit 130 is electrically connected with the rechargeable battery 10, and the voltage conversion circuit 130 boosts the voltage at the output end of the photovoltaic cell 120 and outputs the boosted voltage to the rechargeable battery 10.
Optionally, the light emitting module includes at least one of: violet, red, green and blue light emitting diodes. Further, the light emitting module includes a gallium nitride light emitting diode. Optionally, the photovoltaic cell 120 includes at least one of: gallium arsenide, monocrystalline silicon, polycrystalline silicon, amorphous silicon, copper indium tin, copper indium gallium selenide, cadmium telluride, and polymer photovoltaic cells. Optionally, photovoltaic cell 1120 is a flexible photovoltaic cell. Optionally, the light emitting module 110 includes: a triangular purple gallium nitride light emitting diode; photovoltaic cell 120 comprises a gallium arsenide photovoltaic cell. Optionally, the photovoltaic cell 120 is opposite to the light emitting side of the light emitting module 110.
Optionally, on the basis of the above embodiment, with reference to fig. 2, any battery unit is the first battery unit 210, and the number of the light emitting modules 110 is multiple, and the light emitting modules are electrically connected to all the first battery units 210 in a one-to-one correspondence manner.
Optionally, an embodiment of the present invention provides another equalizing circuit for a rechargeable battery, where the equalizing circuit for a rechargeable battery is the same as the structure of the equalizing circuit for a rechargeable battery shown in fig. 3, and referring to fig. 3, on the basis of the foregoing embodiment, optionally, the equalizing circuit 100 for a rechargeable battery further includes: the control module 160, the second voltage detection module 150, and the switch module 140 disposed corresponding to the light emitting module 110, wherein the switch module 140 includes a first end N1, a second end N2, and a control end Ctrl, wherein the first end N1 of the switch module 140 is electrically connected to the first end of the corresponding light emitting module 110, and the second end N2 of the switch module 140 and the second end of the corresponding light emitting module 110 are electrically connected to two ends of the corresponding first battery cell 210, respectively; the voltage detection module 150 is electrically connected to the plurality of battery cells 200, and detects a voltage at both ends of each battery cell 200; the control module 160 is electrically connected to the voltage detection module 150, the control module 160 is further electrically connected to the control terminal Ctr1 of the switch module 140, and when the voltage detection module detects that the voltage of any battery cell 200 exceeds the second threshold voltage, the control module 160 controls the first terminal N1 and the second terminal N2 of the switch module 140 corresponding to the battery cell 200 whose voltage exceeds the second threshold voltage to be conducted.
When the voltage detection module 150 detects that the voltage of any battery cell 200 exceeds the second threshold voltage, the control module 160 controls the first terminal N1 and the second terminal N2 of the switch module 140 corresponding to the battery cell 210 with the voltage exceeding the second threshold voltage to be conducted, and the light emitting module 110 electrically connected to the conducted switch module 140 emits light to convert the electric energy of the battery cell 200 with the voltage exceeding the second threshold voltage into light energy. When it is detected that the voltage of a certain battery cell 200 is less than the second threshold voltage, the control module 160 controls the first terminal N1 and the second terminal N2 of the switch module 140 corresponding to the battery cell 200 to be turned off, and the light emitting module 110 does not emit light. The switch module 140 and the voltage detection module 150 in this embodiment have the same or similar structures as those of the switch module and the voltage detection module in the above embodiments, and when the switch module 140 is a triode, the schematic structural diagram of the equalizing circuit for the rechargeable battery can refer to fig. 4. The control module 160 may be implemented by software and/or hardware. The control module 160 may be a single chip or a Field-Programmable Gate Array (FPGA).
Optionally, fig. 5 is a schematic structural diagram of another equalizing circuit for rechargeable batteries according to an embodiment of the present invention, and based on the above embodiment, optionally, the battery units 200 are connected in series, the light emitting modules 110 are in one-to-one correspondence with the battery units 200, and the light emitting modules 110 are connected in parallel with the corresponding battery units 200. It should be noted that the light emitting module 100 may include one light emitting diode, or may include a plurality of light emitting diodes connected in series and/or in parallel, where the light emitting diode itself has a voltage monitoring and switching function, when the voltage of the battery unit 200 exceeds the second threshold voltage, the voltage of the light emitting diode is greater than the turn-on voltage, the light emitting diode is turned on and emits light, and when the voltage of the battery unit 200 is less than the second threshold voltage, the voltage of the light emitting diode is lower than the turn-on voltage, the light emitting diode is turned off and does not emit light, and there is no need to additionally provide a switching module and a voltage detecting module.
The embodiment of the invention also provides a rechargeable battery system. Referring to fig. 1 to 3, the rechargeable battery system includes: a rechargeable battery 10 and an equalizing circuit 100.
Wherein, the rechargeable battery 10 comprises a plurality of battery units 200; the equalization circuit 100 includes: the photovoltaic cell 120 and the light emitting module 110, the light emitting module 110 is electrically connected to the rechargeable battery 10, and when the voltage difference between any two battery units 200 exceeds a first threshold voltage, the light emitting module 110 converts the electric energy of the battery units 200 into light energy; the photovoltaic cell 120 receives light energy and converts the light energy into electrical energy.
The voltage of each battery unit in the plurality of battery units can be equal or close to each other through the equalizing action of the equalizing circuit. The equalizing circuit in the rechargeable battery according to the embodiments of the present invention has the same or similar structure and function as the equalizing circuit in the above embodiments, so that the rechargeable battery system according to the embodiments of the present invention also has the beneficial effects described in the above embodiments, and further description is omitted here.
Alternatively, a plurality of battery cells 200 are connected in series.
Optionally, fig. 6 is a schematic structural diagram of a rechargeable battery system according to an embodiment of the present invention, and on the basis of the above embodiment, the rechargeable battery system further includes a housing 300, and the plurality of battery units 200 (not shown), the at least one light emitting module 110 (not shown), and the photovoltaic cell 120 are located inside the housing 300.
Optionally, on the basis of the above embodiment of the invention, the photovoltaic cell 120 is attached to the inner surface of the casing 300, and a reflective material layer is disposed in a region of the casing 300 not covered by the photovoltaic cell 120; the outer surface of the battery cell 200 is provided with a reflective material layer.
Wherein, the higher the emissivity of the reflective material layer is, the better, so that the light irradiated onto the photovoltaic cell 120 is reflected to the inner surface of the battery cell 200 or the housing 300, then emitted again, and returned to the photovoltaic cell 120, thereby improving the absorption efficiency and the energy conversion efficiency of the photovoltaic cell 120. Optionally, the layer of reflective material comprises a reflective paint, i.e. a high reflectivity paint is applied to the outer surface of the battery cell 200 and/or to the areas of the housing 300 not covered by the photovoltaic cells 120.
Alternatively, fig. 7 is a schematic structural diagram of another rechargeable battery system according to an embodiment of the present invention, in which, on the basis of the above embodiment, the housing 300 includes a receiving portion 310 and a cover portion 320, the plurality of battery cells 200 and at least one light emitting module 110 (not shown in the figure) are located in a receiving area of the receiving portion 310, the photovoltaic cell 120 is attached to a first surface of the cover portion 320, and the first surface of the cover portion 320 faces the receiving area.
Alternatively, the areas of the housing 300 not covered by the photovoltaic cells 120 are made of polished metal, having a high reflectivity.
The embodiment of the invention provides a rechargeable battery system. Referring to fig. 1, 2, 3, 4 or 5, the rechargeable battery system includes: a rechargeable battery 10 and an equalizing circuit 100.
Wherein, the rechargeable battery 10 comprises a plurality of battery units 200; the equalization circuit 100 includes: the photovoltaic cell 120 and the light emitting module 110, the light emitting module 110 is electrically connected to the rechargeable battery 10, and when the voltage of the battery unit 200 is detected to exceed the second threshold voltage, the light emitting module converts the electric energy of the battery unit 200 into light energy; the photovoltaic cell 120 receives light energy and converts the light energy into electrical energy.
The voltage of each battery unit in the plurality of battery units can be equal through the balance action of the balance circuit. The equalizing circuit in the rechargeable battery according to the embodiments of the present invention has the same or similar structure and function as the equalizing circuit in the above embodiments, so that the rechargeable battery system according to the embodiments of the present invention also has the beneficial effects described in the above embodiments, and further description is omitted here.
Alternatively, a plurality of battery cells 200 are connected in series.
Optionally, on the basis of the above embodiment, with continuing reference to fig. 6, the rechargeable battery system 2 further includes a housing 300, and the plurality of battery cells 200 (not shown), the light emitting module 110 (not shown) and the photovoltaic cell 120 are located inside the housing 300.
Optionally, on the basis of the above embodiment, the photovoltaic cell 120 is attached to the inner surface of the casing 300, and a reflective material layer is disposed on the area of the casing 300 not covered by the photovoltaic cell 120; the outer surface of the battery cell 200 is provided with a reflective material layer.
Wherein, the higher the emissivity of the reflective material layer is, the better, so that the light irradiated onto the photovoltaic cell 120 is reflected to the inner surface of the battery cell 200 or the housing 300, then emitted again, and returned to the photovoltaic cell 120, thereby improving the absorption efficiency and the energy conversion efficiency of the photovoltaic cell 120. Optionally, the layer of reflective material comprises a reflective paint, i.e. a high reflectivity paint is applied to the outer surface of the battery cell 200 and/or to the areas of the housing 300 not covered by the photovoltaic cells 120.
Alternatively, with continued reference to fig. 7 based on the above embodiment, the housing 300 includes a receiving portion 310 and a cover portion 320, the plurality of battery cells 200 and the at least one light emitting module 110 (not shown) are located in a receiving area of the receiving portion 310, and the photovoltaic cell 120 is attached to a first surface of the cover portion 320, the first surface of the cover portion 320 facing the receiving area.
Alternatively, the areas of the housing 300 not covered by the photovoltaic cells 120 are made of polished metal, having a high reflectivity.
The embodiment of the invention also provides an electric vehicle. Fig. 8 is a schematic structural diagram of an electric vehicle according to an embodiment of the present invention. The electric vehicle includes: a motor drive circuit 20, a motor 30, and a rechargeable battery system 2.
As shown in fig. 8 and fig. 1, the rechargeable battery system 2 includes: a rechargeable battery 10 and an equalizing circuit 100, the rechargeable battery 10 including a plurality of battery cells (not shown in the figure); the equalizing circuit 100 includes a photovoltaic cell (not shown in the figure) and a light-emitting module (not shown in the figure), the light-emitting module is electrically connected to the rechargeable battery 10, detects that the voltage difference between any two battery units exceeds a first threshold voltage, and converts the electric energy of the battery units into light energy; the photovoltaic cell receives light energy and converts the light energy into electric energy; the motor driving circuit 20 is electrically connected to the rechargeable battery system to drive the motor.
The motor drive circuit 20 is configured to drive the motor 30 to rotate, and control the rotation speed of the motor 30 to drive the electric vehicle 1. The motor 30 may be a dc motor or an ac motor. The more the electric vehicle 1 travels, the larger the passenger load, the larger the required capacity of the rechargeable battery 10, the higher the equalization capability of the equalization circuit is required, and the more the light energy is converted by the light emitting module 110. The plurality of battery cells are connected in series. Both ends of the plurality of battery cells connected in series may be electrically connected to both input ends of the motor drive circuit 20, respectively. The light-emitting modules are electrically connected with the battery units in a one-to-one correspondence manner.
The structure and function of the rechargeable battery system in the electric vehicle according to the embodiment of the present invention are the same as or similar to those of the rechargeable battery system in the above embodiment, so that the electric vehicle according to the embodiment of the present invention also has the beneficial effects described in the above embodiment, and further description is omitted here.
Alternatively, fig. 9 is a schematic structural diagram of another electric vehicle according to an embodiment of the present invention, in which on the basis of the above embodiment, the motor is an ac motor, and the motor driving circuit 20 includes a voltage boost circuit 21 and an inverter 22.
The alternating current motor can be an asynchronous motor, a permanent magnet synchronous motor or a switched reluctance motor and the like. The alternating current motor is suitable for high-power occasions.
The embodiment of the invention provides another electric vehicle. With continued reference to fig. 8, the electric vehicle includes: a motor drive circuit 20, a motor 30, and a rechargeable battery system 2.
As shown in fig. 8 and fig. 1, the rechargeable battery system 2 includes: a rechargeable battery 10 and an equalizing circuit 100, the rechargeable battery 10 including a plurality of battery cells 200; the equalizing circuit 100 includes a photovoltaic cell and a light-emitting module, the light-emitting module is electrically connected to the rechargeable battery 10, detects that the voltage difference of the battery unit 200 exceeds a second threshold voltage, and converts the electric energy of the battery unit into light energy; the photovoltaic cell receives light energy and converts the light energy into electric energy; the motor driving circuit is electrically connected with the rechargeable battery system to drive the motor.
The motor driving circuit 20 is configured to drive the motor 30 to rotate, and control a rotation speed of the motor 30 to drive the electric vehicle. The motor 30 may be a dc motor or an ac motor. The more the driving range of the electric vehicle is, the larger the passenger load is, the larger the required capacity of the rechargeable battery 10 is, the higher the requirement on the equalizing capability of the equalizing circuit is, and the more the light energy is converted by the light emitting module. The plurality of battery cells are connected in series. Both ends of the plurality of battery cells connected in series may be electrically connected to both input ends of the motor drive circuit 20, respectively. The light emitting modules 110 are electrically connected to the battery cells in a one-to-one correspondence.
The structure and function of the rechargeable battery system in the electric vehicle according to the embodiment of the present invention are the same as or similar to those of the rechargeable battery system in the above embodiment, so that the electric vehicle according to the embodiment of the present invention also has the beneficial effects described in the above embodiment, and further description is omitted here.
Alternatively, on the basis of the above embodiment, with continued reference to fig. 9, the motor is an ac motor, and the motor driving circuit 20 includes a voltage boosting circuit 21 and a frequency converter 22.
The alternating current motor can be an asynchronous motor, a permanent magnet synchronous motor or a switched reluctance motor and the like. The alternating current motor is suitable for high-power occasions.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (10)

1. An equalizing circuit for a rechargeable battery, wherein the rechargeable battery comprises a plurality of battery cells;
the equalization circuit includes:
the light-emitting module is electrically connected with the rechargeable battery, detects that the voltage difference between any two battery units exceeds a first threshold voltage, and converts the electric energy of the battery units into light energy;
and the photovoltaic cell receives the light energy and converts the light energy into electric energy.
2. The equalizing circuit for rechargeable batteries according to claim 1, wherein said light emitting module detects that the voltage difference between any two of said battery cells exceeds a first threshold voltage, and converts the electrical energy of the battery cell with the higher voltage of said two battery cells into optical energy.
3. The equalizing circuit for a rechargeable battery according to claim 1, further comprising: the input end of the voltage conversion circuit is electrically connected with the output end of the photovoltaic cell, the output end of the voltage conversion circuit is electrically connected with the rechargeable battery, and the voltage of the output end of the photovoltaic cell is boosted by the voltage conversion circuit and is output to the rechargeable battery.
4. The equalizing circuit for rechargeable batteries according to claim 1, wherein the number of the light-emitting modules is multiple, and the light-emitting modules are electrically connected with the battery units in a one-to-one correspondence; the equalizing circuit for a rechargeable battery further includes: the light-emitting module comprises a control module, a voltage detection module and switch modules, wherein the switch modules are arranged in one-to-one correspondence with the light-emitting modules, and each switch module comprises a first end, a second end and a control end;
the first end of the switch module is electrically connected with the first end of the corresponding light-emitting module, and the second end of the switch module and the second end of the corresponding light-emitting module are respectively electrically connected with the two ends of the corresponding battery unit;
the voltage detection module is electrically connected with the plurality of battery units and is used for detecting the voltage at two ends of each battery unit;
the control module is electrically connected with the voltage detection module, the control module is further electrically connected with the control end of the switch module, the control module calculates the voltage difference of the two battery units according to the voltages of any two battery units detected by the voltage detection module, and when the voltage difference exceeds a first threshold voltage, the control module controls the conduction of the first end and the second end of the switch module corresponding to the battery unit with the larger voltage in the two battery units.
5. An equalizing circuit for a rechargeable battery, wherein the rechargeable battery comprises a plurality of battery cells;
the equalization circuit includes:
the light-emitting module is electrically connected with the rechargeable battery pack, detects that the voltage of the battery unit exceeds a second threshold voltage, and converts the electric energy of the battery unit into light energy;
a photovoltaic cell receiving the light energy and converting the light energy into electrical energy.
6. The equalizing circuit for a rechargeable battery according to claim 5, further comprising: the input end of the voltage conversion circuit is electrically connected with the output end of the photovoltaic cell, the output end of the voltage conversion circuit is electrically connected with the rechargeable battery, and the voltage of the output end of the photovoltaic cell is boosted by the voltage conversion circuit and is output to the rechargeable battery.
7. The equalizing circuit for rechargeable batteries according to claim 5, wherein the number of the light-emitting modules is multiple, and the light-emitting modules are electrically connected with the battery units in a one-to-one correspondence manner; the equalizing circuit for a rechargeable battery further includes: the light-emitting module comprises a control module, a voltage detection module and switch modules, wherein the switch modules are arranged in one-to-one correspondence with the light-emitting modules and comprise first ends, second ends and control ends;
the first end of the switch module is electrically connected with the first end of the corresponding light-emitting module, and the second end of the switch module and the second end of the corresponding light-emitting module are respectively electrically connected with the two ends of the corresponding first battery unit;
the voltage detection module is electrically connected with the plurality of battery units and is used for detecting the voltage at two ends of each battery unit;
the control module is electrically connected with the voltage detection module, the control module is also electrically connected with the control end of the switch module, and when the voltage detection module detects that the voltage of any battery unit exceeds a second threshold voltage, the control module controls the conduction of the first end and the second end of the switch module corresponding to the battery unit with the voltage exceeding the second threshold voltage.
8. A rechargeable battery system, comprising:
a rechargeable battery including a plurality of battery cells;
the equalizing circuit comprises a photovoltaic cell and a light-emitting module, the light-emitting module is electrically connected with the rechargeable battery, detects that the voltage difference of any two battery units exceeds a first threshold voltage, and converts the electric energy of the battery units into light energy;
the photovoltaic cell receives the light energy and converts the light energy into electrical energy.
9. A rechargeable battery system, comprising:
a rechargeable battery including a plurality of battery cells;
the equalizing circuit comprises a photovoltaic cell and a light-emitting module, the light-emitting module is electrically connected with the rechargeable battery, detects that the voltage of the battery unit exceeds a second threshold voltage, and converts the electric energy of the battery unit into light energy;
the photovoltaic cell receives the light energy and converts the light energy into electrical energy.
10. An electric vehicle, characterized by comprising: a motor driving circuit, a motor and a rechargeable battery system,
wherein the rechargeable battery system includes: the battery pack comprises a rechargeable battery and an equalizing circuit, wherein the rechargeable battery comprises a plurality of battery units;
the equalizing circuit comprises a photovoltaic cell and a light-emitting module, the light-emitting module is electrically connected with the rechargeable battery, the voltage difference of any two battery units is detected to exceed a first threshold voltage, and the light-emitting module converts the electric energy of the battery units into light energy; the photovoltaic cell receives the light energy and converts the light energy into electric energy;
the motor driving circuit is electrically connected with the rechargeable battery system and drives the motor.
CN202111111144.0A 2021-09-18 2021-09-18 Equalizing circuit for rechargeable battery, rechargeable battery system and electric vehicle Pending CN113725979A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114531756A (en) * 2021-12-31 2022-05-24 成都德鲁伊科技有限公司 Multifunctional photovoltaic module and intelligent wearable device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114531756A (en) * 2021-12-31 2022-05-24 成都德鲁伊科技有限公司 Multifunctional photovoltaic module and intelligent wearable device

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