CN112895980B - New energy automobile low-temperature charging method and device - Google Patents
New energy automobile low-temperature charging method and device Download PDFInfo
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- CN112895980B CN112895980B CN201911134375.6A CN201911134375A CN112895980B CN 112895980 B CN112895980 B CN 112895980B CN 201911134375 A CN201911134375 A CN 201911134375A CN 112895980 B CN112895980 B CN 112895980B
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 238000001514 detection method Methods 0.000 claims description 7
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 4
- 229910052744 lithium Inorganic materials 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
- B60L58/25—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by controlling the electric load
-
- 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
-
- 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
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
- B60L2240/545—Temperature
-
- 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
- Y02T90/14—Plug-in electric vehicles
Abstract
The invention relates to the field of new energy automobiles, and provides a new energy automobile low-temperature charging method and device and a new energy automobile. The new energy automobile comprises a load for heating a battery pack of the new energy automobile, and the method comprises the following steps: detecting the temperature of the battery pack; when the temperature of the battery pack is detected to be smaller than a preset value, controlling the load to be started; and controlling the battery pack charging equipment to output a first current until the battery pack temperature is detected to be greater than or equal to a preset value, and controlling the battery pack charging equipment to output a second current to normally charge the battery pack, wherein the first current is smaller than the consumption current of the load and smaller than the second current. The invention can reduce the operation load and the development cost.
Description
Technical Field
The invention relates to the technical field of new energy automobiles, in particular to a low-temperature charging method and device for a new energy automobile.
Background
The current new energy vehicles, especially pure electric vehicles, have a battery pack charging function. However, currently, a lithium battery is mostly adopted as a power battery for a new energy automobile, and the lithium battery cannot be charged at a low temperature (for example, below-20 ℃), otherwise, the service life of the battery is affected, and even fire and explosion may be caused.
At present, a mode of opening a relay of a battery pack during low-temperature charging is adopted, so that current is prevented from flowing into the battery, and after the temperature reaches a chargeable temperature, the relay of the battery pack is closed and charging is started. However, the method needs to additionally consider the up-down current flow of the relay and the interaction logic of the up-down current flow, and the operation load of the whole vehicle controller is large.
Disclosure of Invention
In view of the above, the present invention aims to provide a low-temperature charging method for a new energy automobile, so as to reduce the operation load and the development cost.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
a new energy vehicle low temperature charging method, the new energy vehicle including a load for heating a battery pack of the new energy vehicle, the method comprising: detecting the temperature of the battery pack; when the temperature of the battery pack is detected to be smaller than a preset value, controlling the load to be started; and controlling the battery pack charging equipment to output a first current until the battery pack temperature is detected to be greater than or equal to a preset value, and controlling the battery pack charging equipment to output a second current to normally charge the battery pack, wherein the first current is smaller than the consumption current of the load and smaller than the second current.
Further, before detecting the temperature of the battery pack, the method further includes: and controlling the new energy automobile to be electrified, and controlling the battery pack charging equipment not to output current.
Further, after detecting the temperature of the battery pack, the method further comprises: and when the temperature of the battery pack is detected to be greater than or equal to a preset value, controlling the battery pack charging equipment to output the second current so as to normally charge the battery pack.
Further, the load includes a heater and a high-low voltage converter.
Further, the second current is also used for consumption by the load.
Compared with the prior art, the low-temperature charging method for the new energy automobile has the following advantages:
by switching on the load for heating the battery pack at a low temperature (i.e., the temperature of the battery pack is less than a preset value) and causing the battery pack charging device to output a first current less than the current consumed by the load until the temperature of the battery pack is greater than or equal to the preset value, the battery pack can be micro-discharged at the low temperature, thereby avoiding charging the battery pack. The invention does not need to control the relay of the battery pack, reduces the operation load and reduces the development cost.
Another object of the present invention is to provide a low-temperature charging device for a new energy automobile, so as to reduce the operation load and the development cost.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
a new energy automobile low temperature charging apparatus, the new energy automobile including a load for heating a battery pack of the new energy automobile, the apparatus comprising: the battery pack temperature detection device comprises a detection unit and a control unit, wherein the detection unit is used for detecting the temperature of the battery pack; the control unit is used for controlling the load to be started when detecting that the temperature of the battery pack is smaller than a preset value; the control unit is further used for controlling the battery pack charging device to output a first current until the temperature of the battery pack is detected to be greater than or equal to a preset value, and controlling the battery pack charging device to output a second current to normally charge the battery pack, wherein the first current is smaller than the consumption current of the load and smaller than the second current.
Further, before detecting the temperature of the battery pack, the control unit is further configured to: and controlling the new energy automobile to be electrified, and controlling the battery pack charging equipment not to output current.
Further, after detecting the temperature of the battery pack, the control unit is further configured to: and when the temperature of the battery pack is detected to be greater than or equal to a preset value, controlling the battery pack charging equipment to output the second current so as to normally charge the battery pack.
Further, the load includes a heater and a high-low voltage converter.
The low-temperature charging device of the new energy automobile has the same advantages as the low-temperature charging method of the new energy automobile compared with the prior art, and the low-temperature charging device and the low-temperature charging method of the new energy automobile are not described in detail herein.
Another object of the present invention is to provide a new energy automobile, so as to reduce the operation load and the development cost.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
a new energy vehicle comprising the new energy vehicle low temperature charging device described above.
The low-temperature charging method for the new energy automobile has the same advantages as the low-temperature charging method for the new energy automobile compared with the prior art, and the low-temperature charging method for the new energy automobile is not described in detail herein.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention, illustrate and explain the invention and are not to be construed as limiting the invention.
In the drawings:
FIG. 1 is a flow chart of a method for charging a new energy automobile at low temperature according to an embodiment of the invention;
FIG. 2 is a schematic diagram of current flow during low-temperature heating of a new energy automobile according to an embodiment of the present invention;
FIG. 3 is a flow chart of a method for low-temperature charging of a new energy automobile according to another embodiment of the present invention;
fig. 4 is a block diagram of a low-temperature charging device for a new energy automobile according to an embodiment of the invention.
Reference numerals illustrate:
1. detection unit 2 control unit
Detailed Description
In addition, the embodiments of the present invention and the features of the embodiments may be combined with each other without collision.
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Fig. 1 is a flowchart of a low-temperature charging method for a new energy automobile according to an embodiment of the invention. As shown in fig. 1, the new energy automobile includes a load for heating a battery pack of the new energy automobile, and the method includes:
step S11, detecting the temperature of the battery pack;
particularly, a new energy automobile, especially an electric automobile, uses a lithium battery, and the temperature of the lithium battery is below a preset value (typically-20 ℃) and cannot be charged, so that the embodiment of the invention firstly detects the temperature of the battery pack to determine what control mode to use.
Step S12, when the temperature of the battery pack is detected to be smaller than a preset value, controlling the load to be started;
specifically, as shown above, the preset value may preferably be-20 ℃, and the load may include a heater to heat the battery pack and a high-low voltage converter (DC-DC) for high-low voltage conversion of the heater. Since the battery pack cannot be charged when the temperature of the battery pack is less than the preset value, the battery management system (Battery Management System, BMS) may first start the load to heat the battery pack when it is detected that the temperature of the battery pack is less than the preset value.
And S13, controlling the battery pack charging equipment to output a first current until the battery pack temperature is detected to be greater than or equal to a preset value, and controlling the battery pack charging equipment to output a second current to normally charge the battery pack, wherein the first current is smaller than the consumption current of the load.
Specifically, the load needs to be powered during operation, and the charging device can be used for supplying power, for example, a vehicle-mounted charger (OBC) can be used. Since the temperature of the battery pack can be discharged even below a preset value, the hybrid vehicle controller (Hybrid Control Unit, HCU) only controls the charging device to output a first current smaller than the consumption current of the load during the heating of the battery pack, so that the battery pack can be subjected to micro-discharge for the load, and the current can be prevented from flowing into the battery pack. As shown in fig. 2, for example, the first current output from the charger is made 1A smaller than the current consumed by the load, and the middle part of the two lines is supplemented by discharging 1A from the battery pack to reach the current required to be consumed by the load.
When the temperature of the battery pack reaches a preset value and can be charged, the OBC is controlled to output a second current which is larger than the first current (the second current is the current which can be consumed by a load and is used for charging the battery pack), so that the battery pack is charged normally. At this time, the load may not be turned off and the battery pack may continue to be heated.
Fig. 3 is a flowchart of a low-temperature charging method for a new energy automobile according to another embodiment of the present invention. As shown in fig. 3, the method includes:
step S31, controlling the new energy automobile to be electrified, and controlling the battery pack charging equipment not to output current;
specifically, the embodiment provides a more complete low-temperature charging process of the new energy automobile. Firstly, the new energy automobile is powered on normally, and after the power on is completed, the battery pack charging equipment is controlled to temporarily not output current, so that the current is prevented from flowing into the battery pack when the temperature of the battery pack is lower than a preset value.
Step S32, detecting the temperature of the battery pack;
step S33, judging whether the temperature of the battery pack is smaller than a preset value;
step S34, when the temperature of the battery pack is detected to be smaller than a preset value, controlling the load to be started;
and step S35, controlling the battery pack charging equipment to output a first current until the battery pack temperature is detected to be greater than or equal to a preset value, and controlling the battery pack charging equipment to output a second current to normally charge the battery pack, wherein the first current is smaller than the consumption current of the load.
Specifically, in step S32-step S35, after the battery pack charging apparatus is controlled to output the first current, the temperature of the battery pack is re-detected (the load heats the battery pack at this time, the temperature of the battery pack gradually increases), if the temperature of the battery pack is still less than the preset value, the first current is kept to be output, and then the temperature of the battery pack is continuously detected until the temperature of the battery pack is greater than or equal to the preset value, the battery pack charging apparatus is controlled to output the second current. Other portions of the embodiments in the steps S32 to S35 are similar to those described above, and will not be described here again.
And step S36, when the temperature of the battery pack is detected to be greater than or equal to a preset value, controlling the battery pack charging equipment to output the second current so as to normally charge the battery pack.
Specifically, if after step S33, when it is directly determined that the temperature of the battery pack is equal to or greater than the preset value, it is indicated that the battery pack may be directly charged, the battery pack charging device may be directly controlled to output the second current to directly perform normal charging without waiting for the load to be turned on.
Fig. 4 is a block diagram of a low-temperature charging device for a new energy automobile according to an embodiment of the invention. As shown in fig. 4, the new energy automobile includes a load for heating a battery pack of the new energy automobile, and the apparatus includes: a detection unit 1 and a control unit 2, wherein the detection unit 1 is used for detecting the temperature of the battery pack; the control unit 2 is used for controlling the load to be started when detecting that the temperature of the battery pack is smaller than a preset value; the control unit 2 is further configured to control the battery pack charging device to output a first current until the temperature of the battery pack is detected to be greater than or equal to a preset value, and control the battery pack charging device to output a second current to normally charge the battery pack, where the first current is less than a consumption current of the load and less than the second current.
Further, before detecting the temperature of the battery pack, the control unit 2 is further configured to: and controlling the new energy automobile to be electrified, and controlling the battery pack charging equipment not to output current.
Further, after detecting the temperature of the battery pack, the control unit 2 is further configured to: and when the temperature of the battery pack is detected to be greater than or equal to a preset value, controlling the battery pack charging equipment to output the second current so as to normally charge the battery pack.
Further, the load includes a heater and a high-low voltage converter.
The low-temperature charging device of the new energy automobile is similar to the embodiment of the low-temperature charging method of the new energy automobile, and is not described herein.
The embodiment of the invention also provides a new energy automobile, which comprises the new energy automobile low-temperature charging device.
By switching on the load for heating the battery pack at a low temperature (i.e., the temperature of the battery pack is less than a preset value) and causing the battery pack charging device to output a first current less than the current consumed by the load until the temperature of the battery pack is greater than or equal to the preset value, the battery pack can be micro-discharged at the low temperature, thereby avoiding charging the battery pack. The invention does not need to control the relay of the battery pack, reduces the operation load and reduces the development cost.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (7)
1. A new energy vehicle low temperature charging method, wherein the new energy vehicle includes a load for heating a battery pack of the new energy vehicle, the method comprising:
detecting the temperature of the battery pack;
when the temperature of the battery pack is detected to be smaller than a preset value, controlling the load to be started;
controlling a battery pack charging device to output a first current until detecting that the temperature of the battery pack is greater than or equal to a preset value, and controlling the battery pack charging device to output a second current to normally charge the battery pack, wherein the first current is smaller than the consumption current of the load and smaller than the second current, and the second current is also used for being consumed by the load;
wherein after detecting the temperature of the battery pack, the method further comprises:
and when the temperature of the battery pack is detected to be greater than or equal to a preset value, controlling the battery pack charging equipment to output the second current so as to normally charge the battery pack.
2. The method for low-temperature charging of a new energy vehicle according to claim 1, further comprising, prior to detecting the temperature of the battery pack:
and controlling the new energy automobile to be electrified, and controlling the battery pack charging equipment not to output current.
3. The method for low-temperature charging a new energy vehicle according to claim 1, wherein the load includes a heater and a high-low voltage converter.
4. A new energy automobile low temperature charging device, characterized in that the new energy automobile comprises a load for heating a battery pack of the new energy automobile, the device comprising:
the detecting unit and the control unit, wherein,
the detection unit is used for detecting the temperature of the battery pack;
the control unit is used for controlling the load to be started when detecting that the temperature of the battery pack is smaller than a preset value;
the control unit is further configured to control the battery pack charging device to output a first current until the temperature of the battery pack is detected to be greater than or equal to a preset value, and control the battery pack charging device to output a second current to normally charge the battery pack, where the first current is smaller than a consumption current of the load and smaller than the second current, and the second current is further used for the load to consume;
wherein after detecting the temperature of the battery pack, the control unit is further configured to: and when the temperature of the battery pack is detected to be greater than or equal to a preset value, controlling the battery pack charging equipment to output the second current so as to normally charge the battery pack.
5. The low-temperature charging device of claim 4, wherein the control unit is further configured to, prior to detecting the temperature of the battery pack:
and controlling the new energy automobile to be electrified, and controlling the battery pack charging equipment not to output current.
6. The low-temperature charging apparatus of a new energy automobile according to claim 4, wherein the load includes a heater and a high-low voltage converter.
7. A new energy vehicle, characterized in that the new energy vehicle comprises a new energy vehicle low-temperature charging device according to any one of claims 4-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911134375.6A CN112895980B (en) | 2019-11-19 | 2019-11-19 | New energy automobile low-temperature charging method and device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911134375.6A CN112895980B (en) | 2019-11-19 | 2019-11-19 | New energy automobile low-temperature charging method and device |
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| Publication Number | Publication Date |
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| CN112895980A CN112895980A (en) | 2021-06-04 |
| CN112895980B true CN112895980B (en) | 2023-12-15 |
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| CN201911134375.6A Active CN112895980B (en) | 2019-11-19 | 2019-11-19 | New energy automobile low-temperature charging method and device |
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| US8901885B2 (en) * | 2012-03-09 | 2014-12-02 | Tesla Motors, Inc. | Low temperature fast charge |
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| CN103326405A (en) * | 2012-03-20 | 2013-09-25 | 上海大众汽车有限公司 | Method and device for heating and charging electric vehicle at low temperature |
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| CN112895980A (en) | 2021-06-04 |
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