CN107579553B - Charging control method and device of battery management system - Google Patents
Charging control method and device of battery management system Download PDFInfo
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- CN107579553B CN107579553B CN201710686631.7A CN201710686631A CN107579553B CN 107579553 B CN107579553 B CN 107579553B CN 201710686631 A CN201710686631 A CN 201710686631A CN 107579553 B CN107579553 B CN 107579553B
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- 238000007600 charging Methods 0.000 title claims abstract description 82
- 238000000034 method Methods 0.000 title claims abstract description 50
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 60
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 60
- 238000010280 constant potential charging Methods 0.000 claims abstract description 24
- 238000001514 detection method Methods 0.000 claims description 31
- 238000009413 insulation Methods 0.000 claims description 17
- 238000010277 constant-current charging Methods 0.000 description 2
- 238000010281 constant-current constant-voltage charging Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
Classifications
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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
Abstract
The invention provides a charge control method of a battery management system, which comprises the following steps: the battery management unit receives the highest value of the single output voltage and the output current value, and intermittently charges the battery pack under the condition that the highest value of the single output voltage is larger than a first voltage threshold value or under the condition that the highest value of the single output voltage is smaller than the first voltage threshold value and the output current value is smaller than the first current threshold value; the battery management unit acquires an output current value and judges whether the output current value is smaller than a first current threshold value, and under the condition that the output current value is smaller than the first current threshold value, constant-voltage charging is carried out on the battery pack; the invention also provides a charging control device of the battery management system. The invention can control the charging of the lithium battery pack in the charging process of the lithium battery pack, ensures that the lithium battery pack is fully charged, and solves the problem that the full charge state is judged as the full charge state because the full charge is not easy to occur frequently.
Description
Technical Field
The invention relates to the technical field of high-end equipment of new energy automobiles, in particular to a charging control method and device of a battery management system.
Background
In the field of new energy automobiles, as a main energy source of electric automobiles, lithium battery packs have been widely used in recent years because of their advantages of portability, larger capacity, good cycle performance, long service life, and the like. Since lithium batteries for electric vehicles have a high voltage and a large capacity, and the number of single batteries connected in series in the battery packs is large, the batteries are generally managed by a battery management system (abbreviated as "BMS"). When the lithium battery pack is charged, the battery management system also performs charging management on the lithium battery pack.
Currently, a conventional charging method for lithium battery packs is a constant-current constant-voltage charging method (abbreviated as "CC-CV"). The charging method is to charge by a constant current until the battery voltage reaches the off-voltage, and then to charge by a constant voltage until the off-current. When a conventional charging method is used for charging a lithium battery pack, the phenomenon that the lithium battery pack is judged to be in a full charge state instead of full charge is often easy to occur, so that the problem that the electric quantity of the lithium battery pack cannot be full is caused; meanwhile, the conventional charging method is adopted to easily cause overcharging of the lithium battery pack, so that the single lithium battery in the lithium battery pack is easily damaged by overcharging, and the cycle service life of the single lithium battery is shortened. As shown in fig. 1, fig. 1 is a flowchart of a charging control method according to the prior art, when a lithium battery pack is charged by adopting the prior art, if the highest voltage of a single lithium battery in the lithium battery pack reaches a cut-off voltage value, the charging needs to be ended because of the need of preventing overcharge, and at this time, the lithium battery pack tends to be under-charged; therefore, when the constant-current and constant-voltage charging method is adopted to charge the lithium battery pack, how to control the charging through the battery management system, ensure that the lithium battery pack is fully charged, and prevent the lithium battery pack from being overcharged, and meanwhile, how to ensure that the lithium battery pack reaches a fully charged state is a problem to be solved at present.
Disclosure of Invention
The invention provides a charging control method and a device of a battery management system, which can control the charging of a lithium battery pack in the charging process of the lithium battery pack, ensure that the lithium battery pack is fully charged, and solve the problem that the full charge state is judged as the full charge state instead of the full charge easily frequently occurs; meanwhile, when the lithium battery pack is prevented from being overcharged, the lithium battery pack is guaranteed to reach a full charge state, the single lithium battery is prevented from being damaged, the cycle service life of the single lithium battery is prolonged, and meanwhile the lithium battery pack is guaranteed to reach the full charge state.
The technical scheme of the invention is as follows:
a charge control method of a battery management system, the method comprising:
after constant voltage charging is performed, the battery management unit receives a single output voltage highest value of a single battery in the battery pack detected by the battery detection unit and an output current value in the battery pack detected by the insulation detection unit, judges whether the single output voltage highest value is larger than a first voltage threshold value and judges whether the output current value is smaller than the first current threshold value within a first preset time, and the battery pack is intermittently charged by controlling the charger under the condition that the single output voltage highest value is larger than the first voltage threshold value or under the condition that the single output voltage highest value is smaller than the first voltage threshold value and the output current value is smaller than the first current threshold value;
in the intermittent charging process, the battery management unit acquires an output current value and judges whether the output current value is smaller than a first current threshold value, and under the condition that the output current value is smaller than the first current threshold value, the intermittent charging is finished by controlling the charger and constant-voltage charging is continuously carried out on the battery pack.
Further, in the intermittent charging process, after the battery management unit obtains the output current value and determines whether the output current value is smaller than the first current threshold, the method further includes:
under the condition that the output current value is larger than the first current threshold value, the battery management unit obtains the single output voltage value of the single battery in the battery pack, sets the current charging voltage value as the current single battery output voltage value, and controls the charger to finish intermittent charging and continuously perform constant voltage charging on the battery pack.
Further, in the constant voltage charging process, the battery management unit obtains the highest value of the single output voltage of the single battery in the battery pack and judges whether the highest value of the single output voltage is larger than the cut-off voltage, and under the condition that the highest value of the single output voltage is larger than the cut-off voltage, the battery pack is stopped being charged by controlling the charger.
Further, in the intermittent charging process, the battery management unit acquires the highest value of the single output voltage of the single battery in the battery pack and judges whether the highest value of the single output voltage is larger than the cut-off voltage, and under the condition that the highest value of the single output voltage is larger than the cut-off voltage, the battery pack is stopped being charged by controlling the charger.
Further, after judging whether the highest value of the single output voltage is greater than the first voltage threshold and judging whether the output current value is less than the first current threshold in the first preset time, the method further comprises:
and under the condition that the highest value of the single output voltage is smaller than the first voltage threshold value and the output current value is larger than the first current threshold value, continuously keeping constant-voltage charging on the battery pack.
Further, the charging mode of the battery management unit for intermittently charging the battery pack by controlling the charger is as follows:
the battery management unit circularly performs the following charging process by controlling the charger: and stopping charging the battery pack in the second preset time, and charging at a lower charging voltage than that in constant voltage charging in the third preset time.
Further, the third preset time is shorter than the second preset time.
Further, before the battery management unit intermittently charges the battery pack by controlling the charger, the battery management unit further includes:
the battery management unit corrects the current battery capacity to the actual total capacity of the battery.
The invention also provides a charging control device of the lithium battery pack, one or more battery packs connected in series between the total positive electrode and the total negative electrode of the lithium battery pack are arranged in the lithium battery pack, the charging control device comprises a battery management system arranged in a battery pack box body, the battery management system comprises a battery management unit connected to a whole vehicle communication interface through CAN communication, a battery detection unit connected with the battery packs through a collecting equalization line and connected with the battery management unit through CAN communication, an insulation detection unit connected between the total positive electrode and the total negative electrode of the lithium battery pack through a collecting signal line and connected with the battery management unit through CAN communication, the charging control device further comprises a vehicle-mounted charger connected between the total positive electrode and the total negative electrode of the lithium battery pack and connected with the battery management unit through CAN communication, and a shunt connected with the battery packs in series, and the insulation detection unit is connected with the shunt in parallel through the collecting signal line.
The battery detection unit is used for detecting a single output voltage value of a single battery in the battery pack.
The insulation detection unit is used for detecting an output current value in the battery pack.
The battery management unit is used for receiving the highest value of the single output voltage of the single battery in the battery pack detected by the battery detection unit and the output current value in the battery pack detected by the insulation detection unit, judging whether the highest value of the single output voltage is larger than a first voltage threshold value or not and judging whether the output current value is smaller than the first current threshold value or not in a first preset time, and carrying out intermittent charging on the battery pack by controlling the vehicle-mounted charger under the condition that the highest value of the single output voltage is larger than the first voltage threshold value or under the condition that the highest value of the single output voltage is smaller than the first voltage threshold value and the output current value is smaller than the first current threshold value; and the vehicle-mounted charger is further used for obtaining an output current value after intermittent charging and judging whether the output current value is smaller than a first current threshold value, and under the condition that the output current value is smaller than the first current threshold value, the vehicle-mounted charger is controlled to finish intermittent charging and continuously perform constant-voltage charging on the battery pack.
The charging control device also comprises a fuse connected in series with the battery pack and a main negative relay.
The working principle of the invention is as follows:
the battery management unit receives a single output voltage value of a single battery in the battery pack detected by the battery detection unit and an output current value in the battery pack detected by the insulation detection unit, and when the single output voltage maximum value of the single battery in the battery pack is larger than a first voltage threshold value or when the single output voltage maximum value is smaller than the first voltage threshold value and the output current value is smaller than the first current threshold value, the battery management unit controls the charger to intermittently charge the battery pack, and the battery pack is repeatedly cycled; after intermittent charging, the battery management unit continuously receives the output current value of the battery pack detected by the insulation detection unit, and when the output current value is smaller than a first current threshold value, the battery pack is subjected to constant-voltage charging by the charger again under control of the charger until the single output voltage value of the single battery of the lithium battery pack reaches a cut-off voltage, and charging is finished.
The invention has the beneficial effects that:
1. the invention improves the conventional constant-current constant-voltage charging method, and can control the charging of the lithium battery pack through the battery management system, thereby ensuring the full charge of the lithium battery pack and solving the problem that the full charge state is judged as the full charge state because the full charge is not easy to occur frequently;
2. the invention prevents the lithium battery pack from being overcharged, ensures that the lithium battery pack reaches a full charge state, avoids the damage of the single lithium battery, prolongs the cycle service life of the single lithium battery, and simultaneously ensures that the lithium battery pack reaches the full charge state.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a flow chart of a charge control method according to the prior art;
fig. 2 is a flowchart of a charge control method of the battery management system according to an embodiment of the present invention;
fig. 3 is a flowchart of an intermittent charging method according to an embodiment of the present invention;
fig. 4 is an electrical connection diagram of the charge control device according to the embodiment of the present invention.
Detailed Description
Embodiments of the invention are described in detail below with reference to the attached drawings, but the invention can be implemented in a number of different ways, which are defined and covered by the claims.
Examples
A charge control method of a battery management system, see fig. 1, the method comprising:
s100: preparation: the battery management system sets a charging voltage and a charging current;
s101: constant-current and constant-voltage charging is carried out on the lithium battery pack;
s102: the battery management unit receives the highest value of the single output voltage of the single battery in the battery pack detected by the battery detection unit and the output current value in the battery pack detected by the insulation detection unit;
s103: the battery management unit judges whether the highest value of the single output voltage is larger than a first voltage threshold, and enters S105 when the highest value of the single output voltage is larger than the first voltage threshold, and enters S104 when the highest value of the single output voltage is smaller than the first voltage threshold;
s104: judging whether the output current value is smaller than a first current threshold value in a first preset time, entering S105 when the output current value is smaller than the first current threshold value in the first preset time, and returning to S101 when the output current value is larger than the first current threshold value in the first preset time;
s105: the battery management unit controls the charger to intermittently charge the battery pack;
s106: the battery management unit acquires the output current value and judges whether the output current value is smaller than a first current threshold value, and returns to S101 under the condition that the output current value is smaller than the first current threshold value; if the output current value is greater than the first current threshold value, the process advances to S107;
s107: the battery management unit obtains a single output voltage value of a single battery in the battery pack, sets the current charging voltage value as the current single battery output voltage value, and returns to S101;
s108: the battery management unit receives the highest value of the single output voltage of the single battery in the battery pack detected by the battery detection unit again, and when the highest value of the single output voltage is judged to be larger than the cut-off voltage, charging is ended.
The intermittent charging method of step S105 includes:
s201: the battery management unit corrects the current battery capacity to the actual total capacity of the battery;
s202: stopping charging the battery pack within a second preset time;
s203: charging is performed at a charging voltage lower than that at the time of constant voltage charging for a third preset time.
Wherein the third preset time is shorter than the second preset time.
Through the charge control method, the problem that the full charge state is judged because the full charge state is not always easy to occur is solved, the lithium battery pack is prevented from being overcharged, the lithium battery pack is ensured to reach the full charge state, the single lithium battery is prevented from being damaged, the cycle service life of the single lithium battery is prolonged, and the lithium battery pack is ensured to reach the full charge state.
As shown in fig. 4, a charging control device of a lithium battery pack is provided with one or more battery packs connected in series between a total positive electrode and a total negative electrode of the lithium battery pack, the battery packs comprise a battery pack 1, a battery pack 2, a battery pack 3 and a battery pack 4, the charging control device comprises a battery management system arranged in a battery pack box body, the battery management system comprises a battery management unit 5 connected on a whole vehicle communication interface through CAN communication, a battery detection unit 6 connected with the battery pack through a collecting equalization line and connected with the battery management unit 5 through CAN communication, and an insulation detection unit 7 connected between the total positive electrode and the total negative electrode of the lithium battery pack through a collecting signal line and connected with the battery management unit through CAN communication, the charging control device further comprises an on-vehicle charger 11 connected between the total positive electrode and the total negative electrode of the lithium battery pack and connected with the battery management unit through CAN communication, and a shunt 9 connected with the battery pack in series, and the insulation detection unit 7 is further connected with the shunt 9 in parallel through the collecting signal line.
The battery detection unit 6 is used for detecting a single output voltage value of a single battery in the battery pack; the insulation detection unit 7 is used for detecting an output current value in the battery pack; the battery management unit 5 is configured to receive a highest value of a single output voltage from a single battery in the battery pack detected by the battery detection unit 6 and an output current value in the battery pack detected by the insulation detection unit 7, determine whether the highest value of the single output voltage is greater than a first voltage threshold and determine whether the output current value is less than the first current threshold within a first preset time, and perform intermittent charging on the battery pack by controlling the vehicle-mounted charger 11 when the highest value of the single output voltage is greater than the first voltage threshold or when the highest value of the single output voltage is less than the first voltage threshold and the output current value is less than the first current threshold; and the method is also used for acquiring an output current value and judging whether the output current value is smaller than a first current threshold value after intermittent charging, and under the condition that the output current value is smaller than the first current threshold value, the vehicle-mounted charger 11 is controlled to finish intermittent charging and continuously perform constant-voltage charging on the battery pack.
Preferably, the charge control device further comprises a fuse 8 in series with the battery pack and a main negative relay 10.
Preferably, the battery management unit 5 is further configured to continue to keep the constant voltage charging of the battery pack in a case where the highest value of the cell output voltage is smaller than the first voltage threshold value and the output current value is larger than the first current threshold value.
Preferably, after the intermittent charging, the battery management unit 5 is further configured to obtain an output current value, and in a case where the output current value is greater than the first current threshold value, obtain a cell output voltage value of a cell in the battery pack and set the current charging voltage value to the current cell output voltage value, and end the intermittent charging and continue to perform constant voltage charging on the battery pack by controlling the vehicle-mounted charger 11.
Preferably, in the constant voltage charging process, the battery management unit 5 is further configured to obtain a highest value of a cell output voltage of a cell in the battery pack and determine whether the highest value of the cell output voltage is greater than a cut-off voltage, and stop charging the battery pack by controlling the vehicle-mounted charger when the highest value of the cell output voltage is greater than the cut-off voltage.
Preferably, the intermittent charging mode is as follows:
the battery management unit 5 circularly performs the following charging process by controlling the vehicle-mounted charger 11: stopping charging the battery pack within a second preset time, and charging at a charging voltage lower than that at the time of constant voltage charging within a third preset time; wherein the third preset time is shorter than the second preset time.
Preferably, the battery management unit 5 is further configured to correct the current battery capacity to the actual total battery capacity before the battery pack is intermittently charged by controlling the in-vehicle charger 11.
Claims (10)
1. A charge control method of a battery management system, the method comprising:
after constant voltage charging is performed, the battery management unit receives a single output voltage highest value of a single battery in the battery pack detected by the battery detection unit and an output current value in the battery pack detected by the insulation detection unit, judges whether the single output voltage highest value is larger than a first voltage threshold value and judges whether the output current value is smaller than the first current threshold value within a first preset time, and the battery pack is intermittently charged by controlling the charger under the condition that the single output voltage highest value is larger than the first voltage threshold value or under the condition that the single output voltage highest value is smaller than the first voltage threshold value and the output current value is smaller than the first current threshold value;
in the intermittent charging process, the battery management unit acquires an output current value and judges whether the output current value is smaller than a first current threshold value, and under the condition that the output current value is smaller than the first current threshold value, the intermittent charging is finished by controlling the charger and constant-voltage charging is continuously carried out on the battery pack.
2. A charge control method of a battery management system according to claim 1, wherein,
in the intermittent charging process, after the battery management unit obtains the output current value and determines whether the output current value is smaller than the first current threshold, the method further comprises:
under the condition that the output current value is larger than the first current threshold value, the battery management unit obtains the single output voltage value of the single battery in the battery pack, sets the current charging voltage value as the current single battery output voltage value, and controls the charger to finish intermittent charging and continuously perform constant voltage charging on the battery pack.
3. A charge control method of a battery management system according to claim 1, wherein,
in the constant voltage charging process, the battery management unit acquires the highest value of the single output voltage of the single battery in the battery pack and judges whether the highest value of the single output voltage is larger than the cut-off voltage, and under the condition that the highest value of the single output voltage is larger than the cut-off voltage, the battery pack is stopped being charged by controlling the charger.
4. A charge control method of a battery management system according to claim 1 or 2, wherein,
in the intermittent charging process, the battery management unit acquires the highest value of the single output voltage of the single battery in the battery pack and judges whether the highest value of the single output voltage is larger than the cut-off voltage, and under the condition that the highest value of the single output voltage is larger than the cut-off voltage, the battery pack is stopped being charged by controlling the charger.
5. A charge control method of a battery management system according to claim 1, wherein,
judging whether the highest value of the single output voltage is larger than a first voltage threshold value or not, and judging whether the output current value is smaller than the first current threshold value or not in a first preset time, further comprises:
and under the condition that the highest value of the single output voltage is smaller than the first voltage threshold value and the output current value is larger than the first current threshold value, continuously keeping constant-voltage charging on the battery pack.
6. The method for controlling charging of a battery management system according to claim 1, wherein the charging mode of the battery management unit for intermittently charging the battery pack by controlling the charger is as follows:
the battery management unit circularly performs the following charging process by controlling the charger: and stopping charging the battery pack in the second preset time, and charging at a lower charging voltage than that in constant voltage charging in the third preset time.
7. The method for controlling charge of a battery management system according to claim 6, wherein,
the third preset time is shorter than the second preset time.
8. A charge control method of a battery management system according to claim 1, wherein,
before the battery management unit intermittently charges the battery pack by controlling the charger, the battery management unit further comprises:
the battery management unit corrects the current battery capacity to the actual total capacity of the battery.
9. The utility model provides a charge control device of lithium cell package, be provided with one or more group battery of establishing ties between lithium cell package total positive pole and total negative pole in the lithium cell package, this charge control device is including setting up the battery management system in the battery package box, its characterized in that:
the battery management system comprises a battery management unit connected to a whole vehicle communication interface through CAN communication, a battery detection unit connected with a battery pack through a collection equalization line and connected with the battery management unit through CAN communication, and an insulation detection unit connected between the total positive pole and the total negative pole of the lithium battery pack through a collection signal line and connected with the battery management unit through CAN communication, wherein the charging control device also comprises a vehicle-mounted charger connected between the total positive pole and the total negative pole of the lithium battery pack and connected with the battery management unit through CAN communication, and a shunt connected with the battery pack in series, and the insulation detection unit is also connected with the shunt in parallel through the collection signal line;
the battery detection unit is used for detecting a single output voltage value of a single battery in the battery pack;
the insulation detection unit is used for detecting an output current value in the battery pack;
the battery management unit is used for receiving the highest value of the single output voltage of the single battery in the battery pack detected by the battery detection unit and the output current value in the battery pack detected by the insulation detection unit, judging whether the highest value of the single output voltage is larger than a first voltage threshold value and judging whether the output current value is smaller than the first current threshold value in a first preset time, and carrying out intermittent charging on the battery pack by controlling the vehicle-mounted charger under the condition that the highest value of the single output voltage is larger than the first voltage threshold value or under the condition that the highest value of the single output voltage is smaller than the first voltage threshold value and the output current value is smaller than the first current threshold value; and the vehicle-mounted charger is further used for obtaining an output current value after intermittent charging and judging whether the output current value is smaller than a first current threshold value, and under the condition that the output current value is smaller than the first current threshold value, the vehicle-mounted charger is controlled to finish intermittent charging and continuously perform constant-voltage charging on the battery pack.
10. The charge control device of a lithium battery pack according to claim 9, wherein: the charging control device also comprises a fuse connected with the battery pack in series and a main negative relay.
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| CN108879816A (en) * | 2018-06-05 | 2018-11-23 | 杭州奥能电源设备有限公司 | A kind of charge control method based on lithium battery characteristic |
| CN109450013A (en) * | 2018-10-22 | 2019-03-08 | 中国联合网络通信集团有限公司 | A kind of management method and device of base station battery |
| CN114683874A (en) * | 2020-12-25 | 2022-07-01 | 苏州宝时得电动工具有限公司 | Automatic working system, charging station and charging control method |
| CN113851745A (en) * | 2021-09-29 | 2021-12-28 | 东莞新能安科技有限公司 | Battery cell charging control method, battery pack and parallel operation system |
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| CN105024411A (en) * | 2014-04-17 | 2015-11-04 | 中国科学院沈阳自动化研究所 | Intelligent power lithium ion battery management system and charging control method |
| CN106816659A (en) * | 2015-11-30 | 2017-06-09 | 南京德朔实业有限公司 | Charging method and the charger using the method |
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