CN111169324A - Lithium battery system, control method of lithium battery system and vehicle - Google Patents
Lithium battery system, control method of lithium battery system and vehicle Download PDFInfo
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- CN111169324A CN111169324A CN201911424979.4A CN201911424979A CN111169324A CN 111169324 A CN111169324 A CN 111169324A CN 201911424979 A CN201911424979 A CN 201911424979A CN 111169324 A CN111169324 A CN 111169324A
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- 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
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- 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
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
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- 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
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
- B60L58/27—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by heating
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- 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
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- 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
- B60L2240/549—Current
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Secondary Cells (AREA)
Abstract
The invention belongs to the technical field of automobiles, and particularly relates to a lithium battery system, a control method of a lithium battery and a vehicle. The lithium battery system is used for a vehicle, and comprises: the energy dissipation unit is connected with the lithium battery pack in parallel and used for providing power for a vehicle, the heating unit is connected with the lithium battery pack and the energy dissipation unit in parallel, the battery management unit is electrically connected with the energy dissipation unit and the control switch and used for monitoring the temperature of the lithium battery system, the current of the lithium battery system and calculating the electric quantity state of the lithium battery pack, and the battery management unit can control the energy dissipation unit and the heating unit to be turned on or turned off through the control switch. The lithium battery system provided by the invention adopts the battery management unit to detect, control and recover the feedback current of the vehicle, thereby ensuring the safety of the battery system and the whole vehicle and realizing the efficient utilization of energy.
Description
Technical Field
The invention belongs to the technical field of automobiles, and particularly relates to a lithium battery system, a control system of a lithium battery and a vehicle.
Background
This section provides background information related to the present disclosure only and is not necessarily prior art.
At present, a lithium battery system is adopted as a power source of a vehicle, the vehicle does not have a vehicle controller or is not communicated with the battery system, and when a battery management unit in the battery system detects that a feedback current exceeds a maximum feedback current which is allowed to be received by the battery system at present, if a main power supply loop is cut off, the vehicle is out of control; if the battery is not cut off, the battery is easy to generate short circuit or overcharge in long-term use, and the battery is easy to catch fire or explode in serious cases.
Disclosure of Invention
The invention aims to at least solve the problem of imperfect function of controlling the feedback current by a lithium battery vehicle in the prior art, and the aim is realized by the following technical scheme:
a first aspect of the present invention provides a lithium battery system for a vehicle, including:
a lithium battery pack for providing power to the vehicle;
the first control switch is connected in series with one end of the lithium battery pack and used for controlling the on-off of the lithium battery pack;
the heating unit is connected with the lithium battery pack in parallel and used for heating the lithium battery pack;
the second control switch is connected in series with one end of the heating unit and used for controlling the heating unit to be turned on or off;
an energy dissipation unit connected in parallel with both the lithium battery pack and the heating unit, the energy dissipation unit comprising a load device;
the third control switch is connected in series with one end of the energy dissipation unit and used for controlling the energy dissipation unit to be switched on or switched off;
the battery management unit is electrically connected with the energy dissipation unit, the second control switch and the third control switch, and the battery management unit controls the second control switch and/or the third control switch to be switched on or off according to the temperature of the lithium battery pack, the current of the lithium battery pack and the residual electric quantity of the lithium battery pack.
According to the lithium battery system, the disconnection or the connection of the second control switch and/or the third control switch is controlled by combining the temperature of the lithium battery pack, the current of the lithium battery system and the residual electric quantity of the lithium battery pack, the lithium battery pack is heated under the condition that the second control switch is connected, the energy dissipation unit is discharged under the condition that the third control switch is connected, so that the feedback current is fully recycled, the heating power is maximized under the condition that the second control switch and the third control switch are simultaneously connected, and the lithium battery pack is ensured to normally charge a vehicle under the condition that the second control switch and the third control switch are simultaneously connected, so that the safety of the lithium battery system and the whole vehicle is ensured, and the efficient utilization of energy is realized.
In addition, the lithium battery system according to the invention may also have the following additional features:
in some embodiments of the present invention, the load device is a power adjustable load device, and the battery management unit is electrically connected to the load device and controls real-time power of the load device.
In some embodiments of the present invention, the lithium battery system further includes a current detection device connected in series with the lithium battery pack, the current detection device is electrically connected to the battery management unit, and the current detection device is configured to detect a current of the lithium battery system.
In some embodiments of the invention, the lithium battery system further includes a fourth control switch, the fourth control switch is connected in series to the other end of the lithium battery pack, the first control switch, the lithium battery pack and the fourth control switch form a first loop, the heating unit and the second control switch form a second loop, the energy dissipation unit and the third control switch form a third loop, and the first loop, the second loop and the third loop are connected in parallel.
A second aspect of the present invention provides a method for controlling a lithium battery system, the method being implemented by the lithium battery system provided in the first aspect of the present invention, the method for controlling the lithium battery system including the steps of:
receiving the received temperature of the lithium battery pack, the current of the lithium battery pack and calculating the residual electric quantity of the lithium battery pack;
judging whether the received current of the lithium battery pack is feedback current or not;
disconnecting the second and third control switches and switches within the energy dissipation unit based on the received lithium battery pack current not being a feedback current;
judging whether the received temperature of the lithium battery pack and the received current of the lithium battery pack meet a first condition according to the result that the current of the lithium battery pack is feedback current, wherein the first condition is that the received temperature of the lithium battery pack is less than or equal to the lowest temperature of the feed current which can be received by a lithium battery system, and the absolute value of the received current of the lithium battery pack is less than or equal to the working current of the heating unit at the temperature of the lithium battery pack;
and closing the second control switch according to the result that the received temperature of the lithium battery pack and the received current of the lithium battery pack meet the first condition.
According to the control method of the lithium battery system provided by the second aspect of the invention, whether the current of the lithium battery system is the feedback current is judged by receiving the collected lithium battery pack current, the heating unit is started by closing the second control switch in combination with the received temperature of the lithium battery pack and the calculated residual electric quantity of the lithium battery pack, so that the lithium battery pack is heated, the feedback current is utilized, and the efficient utilization of energy is realized under the condition of ensuring the safety of the lithium battery system and the whole vehicle.
In some embodiments of the present invention, the control method of the lithium battery system further comprises the steps of:
judging whether the received temperature of the lithium battery pack and the received current of the lithium battery pack meet a second condition according to the result that the received temperature of the lithium battery pack and the received current of the lithium battery pack do not meet the first condition, wherein the second condition is that the received temperature of the lithium battery pack is less than or equal to the lowest temperature at which a lithium battery system can receive the feedback current and the absolute value of the received current of the lithium battery pack is greater than the working current of the heating unit at the temperature of the lithium battery pack;
and according to the result that the received lithium battery pack temperature and the received lithium battery pack current meet a second condition, closing the second control switch and the third control switch and adjusting the real-time power of the energy dissipation unit.
In some embodiments of the present invention, the control method of the lithium battery system further comprises the steps of:
judging whether the received temperature of the lithium battery pack and the received current of the lithium battery pack meet a third condition according to the result that the received temperature of the lithium battery pack and the received current of the lithium battery pack do not meet the second condition, wherein the third condition is that the received temperature of the lithium battery pack is higher than the lowest temperature of the feed current which can be received back by the lithium battery system and is lower than the highest temperature of the feed current which can be received back by the lithium battery system, and the received current of the lithium battery pack is not higher than the currently allowed maximum feedback current of the lithium battery pack;
and returning to the step of receiving the temperature of the lithium battery pack, the current of the lithium battery pack and the residual electric quantity of the lithium battery pack according to the result that the received temperature of the lithium battery pack and the received current of the lithium battery pack meet the third condition.
In some embodiments of the present invention, the control method of the lithium battery system further comprises the steps of:
and closing the third control switch and adjusting the real-time power of the energy dissipation unit according to the result that the received temperature of the lithium battery pack and the received current of the lithium battery pack do not meet the third condition.
In some embodiments of the present invention, the step of determining whether the received current of the lithium battery pack is a feedback current comprises: and if the current of the lithium battery pack is less than 0, judging that the current of the lithium battery pack is feedback current.
A third aspect of the invention proposes a vehicle comprising a lithium battery system for providing power to the vehicle, the lithium battery system comprising a battery management unit for performing the method for controlling the lithium battery system proposed in the second aspect of the invention.
The lithium battery engine provided by the third aspect of the present invention has the same beneficial effects as the lithium battery system provided by the first aspect of the present invention, and details are not repeated herein.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like parts are designated by like reference numerals throughout the drawings. In the drawings:
FIG. 1 schematically illustrates a system configuration according to an embodiment of the invention;
FIG. 2 schematically shows a flow diagram of a control method according to an embodiment of the invention;
the reference symbols in the drawings denote the following:
100: lithium battery system, 10: lithium battery group, 11: first control switch, 12: the fourth control unit 13: current detection device, 20: heating unit, 21: second control switch, 30: energy dissipation unit, 31: third control switch, 40: a battery management unit;
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless specifically identified as an order of performance. It should also be understood that additional or alternative steps may be used.
Although the terms, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, an element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
For convenience of description, spatially relative terms, such as "inner", "outer", "lower", "below", "upper", "above", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" can include both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
As shown in fig. 1, a first aspect of the present invention provides a lithium battery system 100 for a vehicle, including:
the lithium battery pack 10, the lithium battery pack 10 is used for providing power for the vehicle;
the first control switch 11 is connected in series with one end of the lithium battery pack 10, and is used for controlling the on-off of the lithium battery pack 10;
a heating unit 20 connected in parallel with the lithium battery pack 10, the heating unit 20 being configured to heat the lithium battery pack 10;
the second control switch 21, the second control switch 21 is connected in series to one end of the heating unit 20, and is used for controlling the heating unit 20 to be turned on or turned off;
an energy dissipation unit 30 connected in parallel to both the lithium battery pack 10 and the heating unit 20, the energy dissipation unit 30 including a load device;
a third control switch 31, wherein the third control switch 31 is connected in series to one end of the energy dissipation unit 30, and is used for controlling the energy dissipation unit 30 to be turned on or turned off;
and a battery management unit 40, wherein the battery management unit 40 is electrically connected with the lithium battery pack 10, the energy dissipation unit 30 and the heating unit 20, and the battery management unit 40 controls the second control switch 21 and/or the third control switch 31 to be opened or closed according to the temperature of the lithium battery pack 10, the current of the lithium battery pack 10 and the remaining power of the lithium battery pack 10.
According to the lithium battery system 100 provided by the invention, the opening or closing of the second control switch 21 and/or the third control switch 31 is controlled by combining the temperature of the lithium battery pack, the current of the lithium battery system and the residual capacity of the lithium battery pack, the lithium battery pack 10 is heated under the condition that the second control switch 21 is closed, the energy dissipation unit 30 is discharged under the condition that the third control switch is closed 31, so that the feedback current is fully recycled, the heating power is maximized under the condition that the second control switch 21 and the third control switch 31 are simultaneously closed, and the lithium battery pack 10 is ensured to normally charge the vehicle under the condition that the second control switch 21 and the third control switch 31 are simultaneously opened, so that the safety of the lithium battery system 100 and the whole vehicle is ensured, and the efficient utilization of energy is realized.
In some embodiments of the present invention, the load device is a power adjustable load device, and the battery management unit 40 is electrically connected to the load device and controls the real-time power of the load device. The load is discharged when the feedback current exceeds the recovery upper limit by adjusting the power of the load device in real time, so that the maximization of the heating power of the heating unit 20 is ensured, and the sufficient recovery and utilization of the feedback current are realized.
In some embodiments of the present invention, the lithium battery system 100 further includes a current detection device 13 connected in series with the lithium battery pack 10, the current detection device 13 is electrically connected to the battery management unit 40, and the current detection device 13 is used for detecting the current of the lithium battery system 100. The current detection device 13 is provided to detect the current of the lithium battery system 100.
In some embodiments of the present invention, the lithium battery system 100 further includes a fourth control switch 12, the fourth control switch 12 is connected in series to the other end of the lithium battery pack 10, the first control switch 11, the lithium battery pack 10 and the fourth control switch 12 form a first loop, the heating unit 20 and the second control switch 21 form a second loop, the energy dissipation unit 30 and the third control switch 31 form a third loop, and the first loop, the second loop and the third loop are connected in parallel. The on or off of the lithium battery system 100 is realized by setting the on or off of the fourth control switch 12, so that the safety of the battery system and the whole vehicle is ensured.
A second aspect of the present invention provides a control method for a lithium battery system 100, where the control method for the lithium battery system 100 is implemented according to the lithium battery system 100 provided by the first aspect of the present invention, and the control method for the lithium battery system 100 includes the following steps:
receiving the acquired temperature T of the lithium battery pack 10, the current I of the lithium battery pack 10 and the residual electric quantity of the lithium battery pack 10;
judging whether the received current I of the lithium battery pack 10 is feedback current;
according to the received result that the current I of the lithium battery pack 10 is not the feedback current, the switches in the second control switch 21 and the third control switch 31 and the energy dissipation unit 30 are turned off;
judging whether the received temperature T of the lithium battery pack 10 and the received current I of the lithium battery pack 10 meet a first condition according to the result that the current I of the lithium battery pack 10 is feedback current, wherein the first condition is that the received temperature T of the lithium battery pack 10 is less than or equal to the lowest temperature T of the feed current which can be received back by the lithium battery system 1001And the absolute value of the received current I of the lithium battery pack 10 is less than or equal to the working current of the heating unit 20 at the temperature T of the lithium battery pack 10;
the second control switch 21 is closed as a result of the received temperature T of the lithium battery pack 10 and the received current I of the lithium battery pack 10 satisfying the first condition. The control method of the lithium battery system 100 according to the second aspect of the present invention determines whether the current I of the lithium battery pack 10 is a feedback current by receiving the collected temperature T of the lithium battery pack 10, the current of the lithium battery pack 10, and the remaining power of the lithium battery pack 10, and when the temperature T of the lithium battery pack 10 detected by the battery management unit 40 is less than or equal to the lowest temperature T of the feed current that the lithium battery system 100 can receive and receive1And the absolute value of the received current I of the lithium battery pack 10 is less than or equal to the working current I of the heating unit 20 at the temperature T of the lithium battery pack 101When the second control switch 21 is closed, the heating unit 20 is turned on, and the lithium battery pack 10 is heated to recover and utilize the feedback current energy. Under the condition of ensuring the safety of the lithium battery system 100 and the whole vehicle, the efficient utilization of energy is realized.
In some embodiments of the present invention, the control method of the lithium battery system 100 further comprises the steps of:
judging whether the received temperature T of the lithium battery pack 10 and the received current of the lithium battery pack 10 meet a second condition according to the result that the received temperature T of the lithium battery pack 10 and the received current of the lithium battery pack 10 do not meet the first condition, wherein the second condition is that the received temperature T of the lithium battery pack 10 is less than or equal to the lowest temperature T at which the lithium battery system 100 can receive the feedback current1And the absolute value of the received current of the lithium battery pack 10 is greater than the working current of the heating unit 20 at the temperature T of the lithium battery pack 10;
as a result of the received temperature T of the lithium battery pack 10 and the received current of the lithium battery pack 10 satisfying the second condition, the second control switch 21 and the third control switch 31 are closed and the real-time power of the energy dissipation unit 30 is adjusted.
When the battery management unit 40 monitors that the temperature T of the lithium battery pack 10 is less than or equal to the minimum temperature T of the power supply current receivable by the lithium battery system 1001And the absolute value of the received current of the lithium battery pack 10 is greater than the working current of the heating unit 20 at the temperature T of the lithium battery pack 10, the heating unit 20 and the energy dissipation unit 30 are turned on and adjusted, and the maximization of the heating power of the heating unit 20 is ensured by adjusting the real-time power of the energy dissipation unit 30; when the received temperature T of the lithium battery pack 10 is greater than the lowest temperature T1 of the power feed current which can be received back by the lithium battery system 100 and is less than the highest temperature T of the power feed current which can be received back by the lithium battery system 1002And the received current of the lithium battery pack 10 is not more than the currently allowed maximum feedback current I of the lithium battery pack 102And returning to the step of receiving the temperature T of the lithium battery pack 10, the current of the lithium battery pack 10 and the residual electric quantity of the lithium battery pack 10. The safety of a battery system and the whole vehicle is ensured, and the efficient utilization of energy is realized.
In some embodiments of the present invention, the control method of the lithium battery system 100 further comprises the steps of:
judging whether the received temperature T of the lithium battery pack 10 and the received current of the lithium battery pack 10 meet a third condition according to the result that the received temperature T of the lithium battery pack 10 and the received current of the lithium battery pack 10 do not meet the second condition, wherein the third condition is that the received temperature T of the lithium battery pack 10 is greater than the receiving current of the lithium battery system 100Minimum temperature T of1And is less than the maximum temperature T of the power supply current receivable by the lithium battery system 1002And the received current of the lithium battery pack 10 is not more than the currently allowed maximum feedback current I of the lithium battery pack 102；
And returning to the step of receiving the temperature T of the lithium battery pack 10, the current of the lithium battery pack 10 and the residual electric quantity of the lithium battery pack 10 according to the result that the received temperature T of the lithium battery pack 10 and the received current of the lithium battery pack 10 meet the third condition. The battery management unit 40 continues to monitor the system temperature current without turning on the heating unit 20 and the energy dissipation unit 30 when the feedback current satisfies the recovery condition.
In some embodiments of the present invention, the control method of the lithium battery system 100 further comprises the steps of:
according to the result that the received temperature T of the lithium battery pack 10 and the received current of the lithium battery pack 10 do not satisfy the third condition, the third control switch 31 is closed and the real-time power of the energy dissipation unit 30 is adjusted. The feedback current is fully recycled by adjusting the real-time power of the energy dissipation unit 30 to discharge when the feedback current exceeds the upper recycling limit.
In some embodiments of the present invention, the step of determining whether the received current of the lithium battery pack 10 is the feedback current comprises: and if the current of the lithium battery pack 10 is less than 0, judging that the current of the lithium battery pack 10 is feedback current. The recycling of the feedback current is realized by controlling the heating unit 20 and the energy dissipation unit by judging whether the current of the lithium battery pack 10 is the feedback current.
A third aspect of the present invention proposes a vehicle, comprising a lithium battery system 100, the lithium battery system 100 being configured to provide power for the vehicle, the lithium battery system 100 comprising a battery management unit 40, the battery management unit 40 being configured to perform the method for controlling the lithium battery system 100 as proposed by the second aspect of the present invention.
The lithium battery engine according to the third aspect of the present invention has the same advantages as the control method of the lithium battery system 100 according to the second aspect of the present invention, and details thereof are not repeated herein.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A lithium battery system for a vehicle, comprising:
a lithium battery pack for providing power to the vehicle;
the first control switch is connected in series with one end of the lithium battery pack and used for controlling the on-off of the lithium battery pack;
the heating unit is connected with the lithium battery pack in parallel and used for heating the lithium battery pack;
the second control switch is connected in series with one end of the heating unit and used for controlling the heating unit to be turned on or off;
an energy dissipation unit connected in parallel with both the lithium battery pack and the heating unit, the energy dissipation unit comprising a load device;
the third control switch is connected in series with one end of the energy dissipation unit and used for controlling the energy dissipation unit to be switched on or switched off;
the battery management unit is electrically connected with the energy dissipation unit, the second control switch and the third control switch, and the battery management unit controls the second control switch and/or the third control switch to be switched on or off according to the temperature of the lithium battery pack, the current of the lithium battery pack and the residual electric quantity of the lithium battery pack.
2. The lithium battery system as claimed in claim 1, wherein the load device is a power adjustable load device, and the battery management unit is electrically connected to the load device and controls real-time power of the load device.
3. The lithium battery system of claim 1, further comprising a current sensing device in series with the lithium battery pack, the current sensing device being electrically coupled to the battery management unit, the current sensing device being configured to sense a current of the lithium battery system.
4. The lithium battery system of claim 3, further comprising a fourth control switch connected in series to the other end of the lithium battery pack, wherein the first control switch, the lithium battery pack, and the fourth control switch form a first loop, the heating unit and the second control switch form a second loop, the energy dissipation unit and the third control switch form a third loop, and the first loop, the second loop, and the third loop are connected in parallel.
5. A control method of a lithium battery system, characterized in that the control method of the lithium battery system is implemented according to the lithium battery system of any one of claims 1 to 4, the control method of the lithium battery system comprising the steps of:
receiving the acquired temperature of the lithium battery pack and the current of the lithium battery pack and calculating the residual electric quantity of the lithium battery pack;
judging whether the received current of the lithium battery pack is feedback current or not;
disconnecting the second and third control switches and switches within the energy dissipation unit based on the received lithium battery pack current not being a feedback current;
judging whether the received temperature of the lithium battery pack and the received current of the lithium battery pack meet a first condition according to the result that the current of the lithium battery pack is feedback current, wherein the first condition is that the received temperature of the lithium battery pack is less than or equal to the lowest temperature of the feed current which can be received by a lithium battery system, and the absolute value of the received current of the lithium battery pack is less than or equal to the working current of the heating unit at the temperature of the lithium battery pack;
and closing the second control switch according to the result that the received temperature and current of the lithium battery pack meet the first condition.
6. The method for controlling a lithium battery system according to claim 5, further comprising the steps of:
judging whether the received lithium battery pack temperature and the received lithium battery pack current meet a second condition according to the result that the received lithium battery pack temperature and the received lithium battery pack current do not meet the first condition, wherein the second condition is that the received lithium battery pack temperature is less than or equal to the lowest temperature at which a lithium battery system can receive a feedback current, and the absolute value of the received lithium battery pack current is greater than the working current of the heating unit at the temperature of the lithium battery pack;
and according to the received result that the temperature and the current of the lithium battery pack meet a second condition, closing the second control switch and the third control switch and adjusting the real-time power of the energy dissipation unit.
7. The method for controlling a lithium battery system according to claim 6, further comprising the steps of:
judging whether the received temperature of the lithium battery pack and the received current of the lithium battery pack meet a third condition according to the result that the received temperature of the lithium battery pack and the received current of the lithium battery pack do not meet the second condition, wherein the third condition is that the received temperature of the lithium battery pack is higher than the lowest temperature of the feed current which can be received back by the lithium battery system and is lower than the highest temperature of the feed current which can be received back by the lithium battery system, and the received current of the lithium battery pack is not higher than the currently allowed maximum feedback current of the lithium battery pack;
and returning to the step of receiving the temperature of the lithium battery pack, the current of the lithium battery pack and the residual electric quantity of the lithium battery pack according to the result that the received temperature of the lithium battery pack and the received current of the lithium battery pack meet the third condition.
8. The method for controlling a lithium battery system according to claim 7, further comprising the steps of:
and closing the third control switch and adjusting the real-time power of the energy dissipation unit according to the result that the received temperature of the lithium battery pack and the received current of the lithium battery pack do not meet the third condition.
9. A method of controlling a lithium battery system according to any of claims 5 to 8, wherein the step of determining whether the received lithium battery current is a feedback current comprises: and if the current of the lithium battery pack is less than 0, judging that the current of the lithium battery pack is feedback current.
10. A vehicle, characterized by comprising a lithium battery system for providing power to the vehicle, the lithium battery system comprising a battery management unit for performing the method of controlling the lithium battery system according to any one of claims 6 to 9.
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| EP4064420A4 (en) * | 2020-09-27 | 2023-07-26 | Zoomlion Intelligent Access Machinery Co., Ltd. | Lithium battery system and overhead working truck |
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