CN213734672U - Power battery heating device, direct current charging pile and electric vehicle charging system - Google Patents
Power battery heating device, direct current charging pile and electric vehicle charging system Download PDFInfo
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- CN213734672U CN213734672U CN202022810042.5U CN202022810042U CN213734672U CN 213734672 U CN213734672 U CN 213734672U CN 202022810042 U CN202022810042 U CN 202022810042U CN 213734672 U CN213734672 U CN 213734672U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- 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
- Y02T90/16—Information or communication technologies improving the operation of electric vehicles
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Abstract
The utility model discloses a power battery heating device, direct current fill electric pile and electric vehicle charging system is applied to the direct current and fills electric pile, and power battery heating device includes: a DC output port; the input end of the bidirectional DC-DC circuit is connected with a charging and discharging capacitor in parallel, and the bidirectional DC-DC circuit is connected with a direct current output port; and the first controller is communicated and interacted with the second controller when the direct current output port is connected to the direct current charging port so as to judge whether the power battery has a heating requirement, and controls the bidirectional DC-DC circuit to work when the power battery has the heating requirement, so that energy exchange is carried out between the power battery and the charging and discharging capacitor, and the heating of the power battery is realized. Therefore, the power battery can be heated through the cooperation of the direct current output port, the bidirectional DC-DC circuit, the first controller and the second controller, and compared with the prior art, the power battery heating device can omit the arrangement of the PTC heating module, thereby reducing the cost of a vehicle and saving resources.
Description
Technical Field
The utility model belongs to the technical field of the vehicle and specifically relates to a power battery heating device, direct current fill electric pile and electric vehicle charging system are related to.
Background
In the related technology, a power battery is arranged on a vehicle, when the air temperature is low, a PTC (PTC heater-PTC heater) heating module is used for heating a circulating water channel of the whole vehicle, and heat is transferred to the power battery through the water channel, so that the power battery is heated. However, the use of the PTC heating module for heating the power battery increases the cost of the vehicle and may cause a waste of resources.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, an object of the present invention is to provide a power battery heating device, which can realize the heating of power battery, and compared with the prior art, can omit the arrangement of the PTC heating module, thereby reducing the cost of the vehicle and saving resources.
The utility model further provides a direct current fills electric pile.
The utility model discloses an electric vehicle charging system is further provided.
According to the utility model discloses a power battery heating device is applied to during the direct current fills electric pile, power battery heating device includes: the direct current output port is used for connecting a direct current charging port of the electric vehicle; the input end of the bidirectional DC-DC circuit is connected with a charging and discharging capacitor in parallel, the output end of the bidirectional DC-DC circuit is connected with the direct current output port, and the bidirectional DC-DC circuit is used for outputting direct current through the direct current output port so as to charge the power battery through the direct current charging port; the first controller is in communication interaction with a second controller of the electric vehicle when the direct current output port is connected to the direct current charging port to judge whether the power battery has a heating requirement or not, and controls the bidirectional DC-DC circuit to alternately perform reverse work and forward work when the power battery has the heating requirement, so that energy exchange is performed between the power battery and the charging and discharging capacitor, and the heating of the power battery is realized.
According to the utility model discloses a power battery heating device through direct current delivery outlet, two-way DC-DC circuit, first controller and second controller cooperation, can realize the heating to power battery, compares with prior art, can save arranging of PTC heating module to can reduce the cost of vehicle, also can save the resource.
In some examples of the present invention, when the bidirectional DC-DC circuit operates in reverse, the power battery charges the charge and discharge capacitor through the bidirectional DC-DC circuit; when the bidirectional DC-DC circuit works in the forward direction, the charging and discharging capacitor charges the power battery through the bidirectional DC-DC circuit.
In some examples of the present invention, the bidirectional DC-DC circuit adopts any one of a high voltage DC-DC of an interleaved LLC topology, an interleaved two-level full-bridge LLC in series, an interleaved two-level LLC in parallel, a three-level full-bridge phase-shift ZVS, a three-level full-bridge LLC, an interleaved two-level full-bridge phase-shift ZVZCS in series, and an interleaved two-level full-bridge phase-shift ZVZCS in parallel.
In some examples of the invention, the bidirectional DC-DC circuit comprises: a first direct current end of the DC-AC bidirectional conversion module is connected with one end of the charge and discharge capacitor, a second direct current end of the DC-AC bidirectional conversion module is connected with the other end of the charge and discharge capacitor, and the DC-AC bidirectional conversion module charges and discharges the charge and discharge capacitor under the control of the first controller; the first alternating current end, the second alternating current end and the third alternating current end of the three-phase filtering module are correspondingly connected with the three-phase alternating current end of the DC-AC bidirectional conversion module; the first ends of three-phase primary windings of the three-phase transformer are correspondingly connected with the fourth alternating current end, the fifth alternating current end and the sixth alternating current end of the three-phase filtering module, the second ends of the three-phase primary windings of the three-phase transformer are connected together, and the second ends of three-phase secondary windings of the three-phase transformer are connected together; the three-phase alternating current end of the AC-DC bidirectional conversion module is correspondingly connected with the first end of the three-phase secondary winding of the three-phase transformer, the first direct current end and the second direct current end of the AC-DC bidirectional conversion module are connected to the direct current output port, and the AC-DC bidirectional conversion module charges and discharges the power battery under the control of the first controller.
In some examples of the present invention, the DC-AC bidirectional conversion module includes first to sixth switching tubes, the first to sixth switching tubes constitute a three-phase inverter bridge, one end of the upper switching tube in the three-phase inverter bridge is connected together as a first DC end of the DC-AC bidirectional conversion module, the other end of the lower switching tube in the three-phase inverter bridge is connected together as a second DC end of the DC-AC bidirectional conversion module, and a node between the upper switching tube and the lower switching tube in the three-phase inverter bridge is a three-phase AC end of the DC-AC bidirectional conversion module.
In some examples of the present invention, the three-phase filter module comprises a first capacitor and a first inductor connected in series, a second capacitor and a second inductor connected in series, a third capacitor and a third inductor connected in series, one end of the first capacitor and the first inductor which are connected in series is used as a first alternating current end of the three-phase filtering module, the other end of the first capacitor and the first inductor which are connected in series is used as a fourth alternating current end of the three-phase filtering module, one end of the second capacitor and the second inductor which are connected in series is used as a second alternating current end of the three-phase filtering module, the other end of the second capacitor and the second inductor which are connected in series is used as a fifth alternating current end of the three-phase filter module, one end of the third capacitor and one end of the third inductor which are connected in series are used as a third alternating current end of the three-phase filtering module, and the other end of the third capacitor and the other end of the third inductor which are connected in series are used as a sixth alternating current end of the three-phase filtering module.
In some examples of the present invention, the AC-DC bidirectional conversion module includes seventh to twelfth switching tubes, the seventh to twelfth switching tubes constitute a three-phase rectifier bridge, one end of the upper switching tube in the three-phase rectifier bridge is connected together as a first DC end of the AC-DC bidirectional conversion module, the other end of the lower switching tube in the three-phase rectifier bridge is connected together as a second DC end of the AC-DC bidirectional conversion module, and a node between the upper switching tube and the lower switching tube in the three-phase rectifier bridge is used as a three-phase AC end of the AC-DC bidirectional conversion module.
In some examples of the invention, the second controller is a vehicle control unit or a battery manager.
According to the utility model discloses a direct current fills electric pile, including foretell power battery heating device.
According to the utility model discloses a direct current fills electric pile can realize the heating to power battery, compares with prior art, can save the arrangement of PTC heating module to can reduce the cost of vehicle, also can save the resource.
According to the utility model discloses an electric vehicle charging system, include: a power battery; according to the above power battery heating device, the power battery heating device is used for realizing heating of the power battery through energy exchange between the power battery and the charge-discharge capacitor when the power battery has a heating requirement.
According to the utility model discloses an electric vehicle charging system can realize the heating to power battery, compares with prior art, can save arranging of PTC heating module to can reduce the cost of vehicle, also can save the resource.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is an interaction diagram of a dc charging pile and a vehicle according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an internal structure of a dc charging pile according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a power cell heating device according to an embodiment of the present invention;
fig. 4 is an effect diagram of switching tube staggering 120 degrees according to the embodiment of the invention;
fig. 5 is a flow chart of energy charged by the power battery for charging and discharging the capacitor according to the embodiment of the present invention;
fig. 6 is a flow chart illustrating charging energy for a power battery by a power battery heating device according to an embodiment of the present invention.
Reference numerals:
a power battery heating device 100;
a DC output port 10;
a bidirectional DC-DC circuit 20;
charging and discharging a capacitor 201;
a DC-AC bidirectional conversion module 202; a first switching tube 2021; a second switching tube 2022; a third switching tube 2023; a fourth switching tube 2024; a fifth switching tube 2025; a sixth switching tube 2026;
a three-phase filtering module 203; a first ac terminal 2031; a second ac terminal 2032; a third ac terminal 2033; a fourth ac terminal 2034; a fifth ac terminal 2035; a sixth ac terminal 2036;
a three-phase transformer 204;
an AC-DC bidirectional conversion module 205; a seventh switching tube 2051; an eighth switching tube 2052; a ninth switching tube 2053; a tenth switching tube 2054; an eleventh switching tube 2055; a twelfth switching tube 2056;
a first capacitor 206; a first inductance 2061; a second capacitance 2063; a second inductance 2064; a third capacitance 2065; a third inductance 2066;
a first controller 30;
a direct current charging pile 200;
a dc charging port 300; a power battery 400; a second controller 500; a vehicle 600.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
A power battery heating apparatus 100 according to an embodiment of the present invention is described below with reference to fig. 1 to 6.
As shown in fig. 1-6, according to the utility model discloses a power battery heating device 100, power battery heating device 100 is applied to direct current and fills electric pile 200, and power battery heating device 100 includes: a direct current outlet 10, a first controller 30 and at least one bidirectional DC-DC circuit 20. Dc outlet 10 is connected to dc charging port 300 of electric vehicle 600. The input end of the bidirectional DC-DC circuit 20 is connected in parallel with a charging and discharging capacitor 201, the output end of the bidirectional DC-DC circuit 20 is connected with the direct current output port 10, and the bidirectional DC-DC circuit 20 is used for outputting direct current through the direct current output port 10, so that the power battery 400 can be charged through the direct current charging port 300. When the DC output port 10 is connected to the DC charging port 300, the first controller 30 performs communication interaction with the second controller 500 of the electric vehicle 600 to determine whether the power battery 400 has a heating requirement, and controls the bidirectional DC-DC circuit 20 to alternately perform reverse operation and forward operation when the power battery 400 has the heating requirement, so as to realize heating of the power battery 400 through energy exchange between the power battery 400 and the charging and discharging capacitor 201.
After the direct current output port 10 is in butt joint with the direct current charging port 300 of the electric vehicle 600, the first controller 30 and the second controller 500 perform low-voltage communication interaction through the CAN bus to judge whether the power battery 400 has a heating requirement, if the power battery 400 has the heating requirement, the first controller 30 controls the bidirectional DC-DC circuit 20 to work, at the moment, the bidirectional DC-DC circuit 20 alternately performs reverse work and forward work, energy CAN be exchanged between the power battery 400 and the charging and discharging capacitor 201 to realize charging and discharging work of the power battery 400, and in an energy exchange process, heat CAN be generated, so that the power battery 400 is heated. The arrangement enables the power battery 400 to be heated, and compared with the prior art, the arrangement of the PTC heating module can be omitted, the number of parts of the vehicle 600 can be reduced, the manufacturing cost of the vehicle 600 can be reduced, and resources can be saved. It should be noted that, when the bidirectional DC-DC circuit 20 alternately performs the reverse operation and the forward operation, the charging and discharging of the power battery 400 pack are realized according to the preset exchange frequency.
Therefore, the power battery 400 can be heated through the cooperation of the direct current output port 10, the bidirectional DC-DC circuit 20, the first controller 30 and the second controller 500, and compared with the prior art, the arrangement of the PTC heating module can be omitted, so that the cost of the vehicle 600 can be reduced, and resources can be saved.
In some embodiments of the present invention, when the bidirectional DC-DC circuit 20 works in reverse, the power battery 400 charges the charging/discharging capacitor 201 through the bidirectional DC-DC circuit 20, and when the bidirectional DC-DC circuit 20 works in forward, the charging/discharging capacitor 201 charges the power battery 400 through the bidirectional DC-DC circuit 20. When the bidirectional DC-DC circuit 20 works in the reverse direction, the power battery 400 charges the charge-discharge capacitor 201 through the bidirectional DC-DC circuit 20, when the power battery 400 discharges, the power battery 400 generates heat to heat the power battery 400, when the bidirectional DC-DC circuit 20 works in the forward direction, the charge-discharge capacitor 201 charges the power battery 400 through the bidirectional DC-DC circuit 20, and when the power battery 400 charges, heat is generated. Therefore, the line impedance generates heat by the repeated flow of energy, which can heat the power battery 400.
The utility model discloses an in some embodiments, two-way DC-DC circuit 20 can adopt the high pressure DC-DC of staggered LLC topology, two level full-bridge LLC of staggered series connection, two level LLC of staggered parallel connection, three level full-bridge phase shift ZVS, three level full-bridge LLC, two level full-bridge phase shift ZVZCS of staggered series connection and two level full-bridge phase shift ZVZCS of staggered parallel connection arbitrary one of them, so set up and to make two-way DC-DC circuit 20 can carry out reverse work and forward work in turn, can guarantee two-way DC-DC circuit 20's working property, thereby can make two-way DC-DC circuit 20's the form that sets up more suitable.
In some embodiments of the present invention, as shown in fig. 3, the bidirectional DC-DC circuit 20 may include: a DC-AC bidirectional conversion module 202, a three-phase filtering module 203, a three-phase transformer 204 and an AC-DC bidirectional conversion module 205. The first direct current end of the DC-AC bidirectional conversion module 202 is connected to one end of the charge/discharge capacitor 201, the second direct current end of the DC-AC bidirectional conversion module 202 is connected to the other end of the charge/discharge capacitor 201, the DC-AC bidirectional conversion module 202 charges/discharges the charge/discharge capacitor 201 under the control of the first controller 30, and it should be noted that when the power battery 400 charges the charge/discharge capacitor 201 through the bidirectional DC-DC circuit 20, the voltage of the charge/discharge capacitor 201 rises, as shown in fig. 4, with reference to the time t0, at this time, 1 phase and 3 are the same, then, phase 2 is turned off, the duration 1/6Ts, the time t1 is only 1 phase is turned on, phase 2 and 3 are turned off, the duration 1/6Ts, t2 is the same, when phase 1 phase and 2 are the same, phase 3 is turned off, the duration 1/6Ts, t3 is the time only 2 phase is turned on, phase 1 and phase 3 are off for 1/6Ts, and so on, to achieve the phase shift of 120 degrees.
Further, the first AC terminal 2031, the second AC terminal 2032, and the third AC terminal 2033 of the three-phase filtering module 203 are correspondingly connected to the three-phase AC terminal of the DC-AC bidirectional conversion module 202. First ends of three-phase primary windings of the three-phase transformer 204 are correspondingly connected with the fourth ac terminal 2034, the fifth ac terminal 2035 and the sixth ac terminal 2036 of the three-phase filtering module 203, second ends of three-phase primary windings of the three-phase transformer 204 are connected together, and second ends of three-phase secondary windings of the three-phase transformer 204 are connected together. The three-phase alternating current end of the AC-DC bidirectional conversion module 205 is correspondingly connected to the first end of the three-phase secondary winding of the three-phase transformer 204, the first direct current end and the second direct current end of the AC-DC bidirectional conversion module 205 are connected to the direct current output port 10, and the AC-DC bidirectional conversion module 205 charges and discharges the power battery 400 under the control of the first controller 30. The charging and discharging working effect of the charging and discharging capacitor 201 can be realized, and the charging and discharging working effect of the power battery 400 can also be realized, so that the power battery heating device 100 can be ensured to heat the power battery 400.
In some embodiments of the present invention, as shown in fig. 3, the DC-AC bidirectional conversion module 202 may include first to sixth switching tubes 2021 to 2026, the first to sixth switching tubes 2021 to 2026 constitute a three-phase inverter bridge, one end of an upper switching tube in the three-phase inverter bridge is connected together as a first DC end of the DC-AC bidirectional conversion module 202, the other end of a lower switching tube in the three-phase inverter bridge is connected together as a second DC end of the DC-AC bidirectional conversion module 202, and a node between the upper switching tube and the lower switching tube in the three-phase inverter bridge is used as a three-phase AC end of the DC-AC bidirectional conversion module 202. The first AC terminal 2031, the second AC terminal 2032, and the third AC terminal 2033 of the three-phase filtering module 203 are connected to the three-phase AC terminals of the DC-AC bidirectional conversion module 202 in a one-to-one correspondence, so that energy can flow between the DC-AC bidirectional conversion module 202 and the three-phase filtering module 203, and the operational reliability of the bidirectional DC-DC circuit 20 can be ensured.
In some embodiments of the present invention, as shown in fig. 3, the three-phase filtering module 203 may include a first capacitor 206 and a first inductor 2061 connected in series, a second capacitor 2063 and a second inductor 2064 connected in series, one end of the third capacitor 2065 and the third inductor 2066 connected in series, one end of the first capacitor 206 and the first inductor 2061 connected in series serves as a first ac end 2031 of the three-phase filtering module 203, the other end of the first capacitor 206 and the first inductor 2061 connected in series serves as a fourth ac end 2034 of the three-phase filtering module 203, one end of the second capacitor 2063 and the second inductor 2064 connected in series serves as a second ac end 2032 of the three-phase filtering module 203, the other end of the second capacitor 2063 and the second inductor 2064 connected in series serves as a fifth ac end 2035 of the three-phase filtering module 203, one end of the third capacitor 2065 and the third inductor 2066 connected in series serves as a third ac end 2033 of the three-phase filtering module 203, and the other end of the third capacitor 2065 and the third inductor 2066 connected in series serves as a sixth ac end 2036 of the three-phase filtering module 203. The arrangement enables the three-phase filter module 203 to be correctly connected between the DC-AC bidirectional conversion module 202 and the three-phase transformer 204, and can ensure that energy can flow among the DC-AC bidirectional conversion module 202, the three-phase filter module 203 and the three-phase transformer 204, thereby further ensuring the working reliability of the bidirectional DC-DC circuit 20.
In some embodiments of the present invention, as shown in fig. 3, the AC-DC bidirectional conversion module 205 may include a seventh switch tube 2051 to a twelfth switch tube 2056, the seventh switch tube 2051 to the twelfth switch tube 2056 form a three-phase rectifier bridge, one end of an upper switch tube in the three-phase rectifier bridge is connected together as a first DC end of the AC-DC bidirectional conversion module 205, the other end of a lower switch tube in the three-phase rectifier bridge is connected together as a second DC end of the AC-DC bidirectional conversion module 205, a node between the upper switch tube and the lower switch tube in the three-phase rectifier bridge is used as a three-phase AC end of the AC-DC bidirectional conversion module 205, and the three-phase AC end is connected to a first end of a three-phase secondary winding of the three-phase transformer 204 in a one-to-one correspondence. So configured, energy can flow between the AC-DC bi-directional conversion module 205 and the three-phase transformer 204.
In some embodiments of the present invention, the second controller 500 may be configured as a vehicle controller or a battery manager, so that the second controller 500 does not need to be separately configured to communicate with the first controller 30, and the number of parts of the vehicle can be prevented from being increased, thereby preventing the manufacturing cost of the vehicle 600 from being increased.
It should be noted that, a plurality of bidirectional DC-DC circuits 20 may be provided, a plurality of bidirectional DC-DC circuits 20 are provided in parallel, the bidirectional DC-DC circuits 20 are high-voltage bidirectional DC-DC circuits 20, energy of the power battery 400 and the charge-discharge capacitor 201 is exchanged through the bidirectional DC-DC circuits 20, a single bidirectional DC-DC circuit 2020KW is used for charging, and a plurality of bidirectional DC-DC circuits 20 are connected in parallel to realize high-power direct-current charging, so that the maximum power can reach 200 KW.
In the process of charging the charging and discharging capacitor 201 by the power battery 400, the seventh switch tube 2051, the eighth switch tube 2052, the ninth switch tube 2053, the tenth switch tube 2054, the eleventh switch tube 2055 and the twelfth switch tube 2056 are turned on, at this time, the seventh switch tube 2051, the eighth switch tube 2052, the ninth switch tube 2053, the tenth switch tube 2054, the eleventh switch tube 2055 and the twelfth switch tube 2056 are turned on according to a preset switching frequency, three-phase switches are staggered by 120 degrees, at this time, the voltage of the charging and discharging capacitor 201 rises, as shown in fig. 4, the phases are staggered, based on a time t0, at this time, the phases 1 and 3 are the same, the phase 2 is turned off, a duration 1/6Ts, a time t1 is a time only 1 phase is turned on, the phases 2 and 3 are turned off, a duration 1/6Ts, a time t2 is a time, the phases 1 and 2 are the same, the phase 3 is turned off, a duration 1/6 and t3 is a time only 2 is turned on, and a phase 3 is turned off, duration 1/6Ts, and so on, to achieve the phase shift of 120 degrees. Also, during this process, the switching of the bi-directional DC-DC circuit 20 is shown in fig. 5, with the arrows indicating the direction of energy flow.
During the process of charging the power battery 400 by the charging and discharging capacitor 201, the first switch tube 2021, the second switch tube 2022, the third switch tube 2023, the fourth switch tube 2024, the fifth switch tube 2025 and the sixth switch tube 2026 are turned on, at this time, the first switch tube 2021, the second switch tube 2022, the third switch tube 2023, the fourth switch tube 2024, the fifth switch tube 2025 and the sixth switch tube 2026 are turned on according to a preset switching frequency, the three-phase switching is staggered by 120 degrees, the staggering principle is shown in fig. 4, and during this process, the switching tube process of the bidirectional DC-DC circuit 20 is shown in fig. 6, and the arrow indicates the energy flowing direction.
According to the utility model discloses electric pile 200 is filled to direct current, including the power battery heating device 100 of above-mentioned embodiment, power battery heating device 100 sets up on electric pile 200 is filled to direct current, and electric pile 200 is filled to direct current can heat power battery 400, compares with prior art, can save the arrangement of PTC heating module to can reduce vehicle 600's cost, also can save the resource.
It should be noted that, when the direct-current charging pile 200 and the vehicle 600 are charged, after the direct-current output port 10 is in contact with the direct-current charging port 300 of the electric vehicle 600, the first controller 30 and the second controller 500 need to send messages to each other for confirmation, and after the vehicle 600 needs to be charged, the first controller 30 controls the bidirectional DC-DC circuit 20 to charge the power battery 400, which may also be understood that the direct-current charging pile 200 charges the power battery 400 of the vehicle 600. In the process that the direct current charging pile 200 charges the vehicle 600, the power grid provides alternating current for the direct current charging pile 200, and after the alternating current flows into the bidirectional DC-DC circuit 20, the bidirectional DC-DC circuit 20 converts the alternating current into direct current to be charged into the power battery 400 of the vehicle 600.
According to the utility model discloses electric vehicle charging system, power battery heating device 100 including power battery 400 and the above-mentioned embodiment, power battery heating device 100 is used for through the energy exchange between power battery 400 and the charge-discharge electric capacity 201 when power battery 400 has the heating demand, realizes power battery 400's heating, sets up like this and can heat power battery 400, compares with prior art, can save arranging of PTC heating module to can reduce vehicle 600's cost, also can save the resource.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. The utility model provides a power battery heating device which characterized in that, is applied to direct current and fills electric pile, power battery heating device includes:
the direct current output port is used for connecting a direct current charging port of the electric vehicle;
the input end of the bidirectional DC-DC circuit is connected with a charging and discharging capacitor in parallel, the output end of the bidirectional DC-DC circuit is connected with the direct current output port, and the bidirectional DC-DC circuit is used for outputting direct current through the direct current output port so as to charge the power battery through the direct current charging port;
the first controller is in communication interaction with a second controller of the electric vehicle when the direct current output port is connected to the direct current charging port to judge whether the power battery has a heating requirement or not, and controls the bidirectional DC-DC circuit to alternately perform reverse work and forward work when the power battery has the heating requirement, so that energy exchange is performed between the power battery and the charging and discharging capacitor, and the heating of the power battery is realized.
2. The power battery heating device of claim 1, wherein when the bidirectional DC-DC circuit operates in reverse, the power battery charges the charge-discharge capacitor through the bidirectional DC-DC circuit; when the bidirectional DC-DC circuit works in the forward direction, the charging and discharging capacitor charges the power battery through the bidirectional DC-DC circuit.
3. The power battery heating apparatus of claim 1 or 2, wherein the bidirectional DC-DC circuit employs any one of a high voltage DC-DC of an interleaved LLC topology, an interleaved series two-level full bridge LLC, an interleaved parallel two-level LLC, a three-level full bridge phase-shifted ZVS, a three-level full bridge LLC, an interleaved series two-level full bridge phase-shifted ZVZCS, and an interleaved parallel two-level full bridge phase-shifted ZVZCS.
4. The power battery heating apparatus of claim 3, wherein the bi-directional DC-DC circuit comprises:
a first direct current end of the DC-AC bidirectional conversion module is connected with one end of the charge and discharge capacitor, a second direct current end of the DC-AC bidirectional conversion module is connected with the other end of the charge and discharge capacitor, and the DC-AC bidirectional conversion module charges and discharges the charge and discharge capacitor under the control of the first controller;
the first alternating current end, the second alternating current end and the third alternating current end of the three-phase filtering module are correspondingly connected with the three-phase alternating current end of the DC-AC bidirectional conversion module;
the first ends of three-phase primary windings of the three-phase transformer are correspondingly connected with the fourth alternating current end, the fifth alternating current end and the sixth alternating current end of the three-phase filtering module, the second ends of the three-phase primary windings of the three-phase transformer are connected together, and the second ends of three-phase secondary windings of the three-phase transformer are connected together;
the three-phase alternating current end of the AC-DC bidirectional conversion module is correspondingly connected with the first end of the three-phase secondary winding of the three-phase transformer, the first direct current end and the second direct current end of the AC-DC bidirectional conversion module are connected to the direct current output port, and the AC-DC bidirectional conversion module charges and discharges the power battery under the control of the first controller.
5. The power battery heating device according to claim 4, wherein the DC-AC bidirectional conversion module comprises first to sixth switching tubes, the first to sixth switching tubes form a three-phase inverter bridge, one end of an upper switching tube in the three-phase inverter bridge is connected together to serve as a first direct-current end of the DC-AC bidirectional conversion module, the other end of a lower switching tube in the three-phase inverter bridge is connected together to serve as a second direct-current end of the DC-AC bidirectional conversion module, and a node between the upper switching tube and the lower switching tube in the three-phase inverter bridge serves as a three-phase alternating-current end of the DC-AC bidirectional conversion module.
6. The power battery heating apparatus of claim 4, wherein the three-phase filter module comprises a first capacitor and a first inductor connected in series, a second capacitor and a second inductor connected in series, a third capacitor and a third inductor connected in series, one end of the first capacitor and the first inductor which are connected in series is used as a first alternating current end of the three-phase filtering module, the other end of the first capacitor and the first inductor which are connected in series is used as a fourth alternating current end of the three-phase filtering module, one end of the second capacitor and the second inductor which are connected in series is used as a second alternating current end of the three-phase filtering module, the other end of the second capacitor and the second inductor which are connected in series is used as a fifth alternating current end of the three-phase filter module, one end of the third capacitor and one end of the third inductor which are connected in series are used as a third alternating current end of the three-phase filtering module, and the other end of the third capacitor and the other end of the third inductor which are connected in series are used as a sixth alternating current end of the three-phase filtering module.
7. The power battery heating device according to claim 4, wherein the AC-DC bidirectional conversion module comprises seventh to twelfth switching tubes, the seventh to twelfth switching tubes form a three-phase rectifier bridge, one end of an upper switching tube in the three-phase rectifier bridge is connected together to serve as a first direct-current end of the AC-DC bidirectional conversion module, the other end of a lower switching tube in the three-phase rectifier bridge is connected together to serve as a second direct-current end of the AC-DC bidirectional conversion module, and a node between the upper switching tube and the lower switching tube in the three-phase rectifier bridge serves as a three-phase alternating-current end of the AC-DC bidirectional conversion module.
8. The power battery heating apparatus of claim 1, wherein the second controller is a vehicle controller or a battery manager.
9. A dc charging post comprising a power cell heating apparatus according to any one of claims 1 to 8.
10. An electric vehicle charging system, comprising:
a power battery;
the power battery heating device of any one of claims 1-8, which is used for realizing heating of the power battery through energy exchange between the power battery and a charge-discharge capacitor when the power battery has a heating requirement.
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| CN202022810042.5U CN213734672U (en) | 2020-11-27 | 2020-11-27 | Power battery heating device, direct current charging pile and electric vehicle charging system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023133831A1 (en) * | 2022-01-14 | 2023-07-20 | 宁德时代新能源科技股份有限公司 | Dc/dc conversion circuit, power unit, charging pile, and charging and discharging heating method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023133831A1 (en) * | 2022-01-14 | 2023-07-20 | 宁德时代新能源科技股份有限公司 | Dc/dc conversion circuit, power unit, charging pile, and charging and discharging heating method |
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