CN110843599A - High-capacity lithium battery pack charging and discharging control system and control method thereof - Google Patents
High-capacity lithium battery pack charging and discharging control system and control method thereof Download PDFInfo
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- CN110843599A CN110843599A CN201911176881.1A CN201911176881A CN110843599A CN 110843599 A CN110843599 A CN 110843599A CN 201911176881 A CN201911176881 A CN 201911176881A CN 110843599 A CN110843599 A CN 110843599A
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- 238000007599 discharging Methods 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 11
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title description 12
- 229910052744 lithium Inorganic materials 0.000 title description 12
- 238000004891 communication Methods 0.000 claims description 13
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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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
-
- 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
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/16—Information or communication technologies improving the operation of electric vehicles
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- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides a high-capacity battery pack charge-discharge control system and a control method thereof, wherein the high-capacity battery pack comprises a finished automobile control input loop, a high-voltage box and a high-capacity battery pack formed by connecting at least two battery pack modules in parallel, a main controller and a DC-DC power supply module are arranged in the high-voltage box, a charging interface and a discharging interface are arranged at the outer end of the high-voltage box, and the DC-DC power supply module is controlled by the finished automobile control input loop to supply power to the main controller; the positive electrode of the charging interface is connected with the finished automobile control input loop through the charging relay, the battery pack module and the DC-DC power supply module in sequence, and the positive electrode of the discharging interface is connected with the finished automobile control input loop through the first discharging relay, the battery pack module and the DC-DC power supply module in sequence; and the negative electrodes of the charging interface and the discharging interface are connected with the DC-DC power supply module. The random arrangement of the large-capacity battery pack effectively saves the space of the whole vehicle, can meet the requirement that multiple chargers charge the battery pack simultaneously, greatly improves the charging current and reduces the charging time.
Description
Technical Field
The invention relates to the technical field of lithium batteries, in particular to a high-capacity battery pack charging and discharging control system and a control method thereof.
Background
With the attention of people on the environment, new energy is rapidly developed in various industries, general industrial vehicles have flexible steering characteristics, the whole vehicle structure is compact, and a battery pack with larger capacity is difficult to configure. In addition, even after a large-capacity battery pack is arranged, the problem of large-current charging cannot be effectively solved, so that the vehicle with the large-capacity battery pack has long charging time, is easy to connect wrong charging interfaces, and causes performance damage to the battery pack.
Disclosure of Invention
The invention aims to provide a high-capacity battery pack charging and discharging control system and a control method thereof.
The technical scheme of the invention is as follows:
a high-capacity battery pack charging and discharging control system comprises a finished automobile control input loop, a high-voltage box and a high-capacity battery pack formed by connecting at least two battery pack modules in parallel, wherein a main controller and a DC-DC power supply module are arranged in the high-voltage box, the outer end of the high-voltage box is provided with a charging interface and a discharging interface, and the number of the charging interfaces corresponds to the number of the battery pack modules one by one; the DC-DC power supply module is controlled by a finished automobile control input loop to supply power to the main controller;
the positive electrode of the charging interface is connected with the finished automobile control input loop through the charging relay, the battery pack module and the DC-DC power supply module in sequence, and the positive electrode of the discharging interface is connected with the finished automobile control input loop through the first discharging relay, the battery pack module and the DC-DC power supply module in sequence; the negative electrode of the charging interface and the negative electrode of the discharging interface are connected with the DC-DC power supply module; the main controller is connected with the high-capacity battery pack through a CAN communication line, and a normally closed relay is connected in series on the control input loop of the whole vehicle; and the charging relay, the first discharging relay and the normally closed relay are all connected with the signal end of the main controller.
In a further scheme, the battery pack module comprises a battery pack and a slave controller, the battery pack is connected to two ends of the DC-DC power supply module in parallel, and a fuse and a current sensor are connected between the battery pack and the DC-DC power supply module in series; the slave controller is connected with a signal end of a second discharging relay, and an output end of the second discharging relay is connected with a positive electrode of the charging interface through the charging relay.
According to the further scheme, the battery pack modules are connected through CAN communication lines, the charging interfaces are connected through CAN communication lines, and the main controller is connected with the slave controllers and the charging interfaces through CAN communication lines.
The control input loop of the whole vehicle in the system is a control system of the vehicle, and the control input loop is connected with the high-capacity battery pack of the invention and used for sending control signals to the DC-DC power module and the main controller.
Another object of the present invention is to provide a control method of a charge and discharge control system for a large-capacity battery pack, comprising the steps of:
(1) the charging interface is connected with a charger, the main controller works, whether the battery pack module meets the charging permission condition or not is judged after self-checking, and if the battery pack module does not meet the charging permission condition, all charging relays are controlled to be disconnected; if the charging permission condition is met, the first discharging relay is switched off, and when the switching-off time t1 of the first discharging relay is 3-5 seconds, the charging relay is pulled in to charge the battery pack module;
(2) after the charging end condition is met or a finished vehicle message is received, continuously monitoring the charging current of the battery pack module after 5 seconds, and when the current value A of the battery pack detected by the current sensor is smaller than a preset threshold value 5A, disconnecting the charging relay to stop charging; if the current value A is larger than the preset threshold value 5A and current still exists within 10 seconds, the main controller disconnects the charging relay to stop charging;
(3) the whole vehicle control input loop drives the main controller to work, the main controller judges whether the battery pack module is in a discharging mode or not, if the battery pack module is not in the discharging mode and the second relay is attracted, the main controller detects the voltage difference of the battery pack, and when the voltage difference is 5-10V, the charging relay is attracted to charge; otherwise, stopping charging;
(4) if the battery pack module is in a discharging mode, all the charging relays are disconnected, the judgment of discharging permission conditions is entered, and if the discharging permission conditions are not met, the normally-closed relays are disconnected; and if the discharging permission condition is met, closing the second discharging relay, detecting the voltage difference of the battery pack from the controller, and attracting the first discharging relay to discharge when the voltage difference is 5-10V.
In a further scheme, the charge permission condition in the step (1) refers to that the charging interface is normally connected with the charger, the charger is normally communicated with the main controller, and the battery pack has no charging ending command.
In a further scheme, the discharging permission condition in the step (4) refers to that the charging interface is not connected with a charger, the charging relay is disconnected and the battery pack works normally.
The invention is based on a battery pack module formed by connecting a plurality of same battery packs in parallel, acquires basic information such as voltage, current and the like of the battery pack module through a battery management system, and controls a high-capacity lithium battery pack formed by connecting a plurality of same battery pack modules in parallel to charge through a relay. In the multi-charging-interface charging mode, under the condition that the current of the battery pack module is not increased, the charging current of the high-capacity lithium battery pack is increased, the problem of heat loss caused by large-current charging is effectively solved, and the high-rate charging of the high-capacity lithium battery pack is realized; in addition, the high-capacity lithium battery pack can control partial battery pack work in a segmented implementation mode, and the problem of discharge capacity reduction caused by parallel connection of multiple battery packs is effectively solved.
So compare with conventional technology fork truck: the invention can realize the random arrangement of the high-capacity battery pack and effectively save the space of the whole vehicle; the external high-voltage box is arranged, so that the maintenance is convenient. In addition, the system can meet the requirement that multiple chargers charge the batteries simultaneously, greatly improves the charging current and reduces the charging time.
Drawings
FIG. 1 is a diagram of a control system of the present invention.
Detailed Description
As shown in fig. 1, a large-capacity battery pack in which two battery modules 4 are connected in parallel via a CAN communication line 3 is described as follows:
a high-capacity battery pack charging and discharging control system comprises a whole vehicle control input loop 1, a high-voltage box 2 and a high-capacity battery pack formed by connecting two battery pack modules 4 in parallel, wherein a main controller W1 and a DC-DC power supply module are arranged inside the high-voltage box 2, and two charging interfaces 5 and a discharging interface 6 are arranged at the outer end of the high-voltage box 2; the DC-DC power supply module is controlled by a whole vehicle control input loop to supply power to the main controller W1;
the positive electrode of the charging interface 5 is connected with a finished automobile control input loop through a charging relay K2 (or K3), a battery pack module and a DC-DC power supply module in sequence, and the positive electrode of the discharging interface 6 is connected with a finished automobile control input loop through a first discharging relay K4, two battery pack modules and a DC-DC power supply module in sequence; the negative electrode of the charging interface and the negative electrode of the discharging interface are connected with the DC-DC power supply module; the main controller W1 is connected with a high-capacity battery pack through a CAN communication line 3, and a normally closed relay K1 is connected in series on the control input loop of the whole vehicle; and the charging relay K2/K3, the first discharging relay K4 and the normally closed relay K1 are all connected with the signal end of the main controller W1.
Further, the battery pack module 4 comprises a battery pack C1/C2 and a slave controller W2/W3, wherein the battery pack C1/C2 is connected in parallel at two ends of the DC-DC power module, and a fuse F1/F2 and a current sensor P1/P2 are connected in series between the battery pack C1/C2 and the DC-DC power module; the slave controller W2/W3 is connected with signal ends of a second discharging relay K5/K6, and the output end of the second discharging relay K5/K6 is connected with the anodes of the two charging interfaces 5 through a charging relay K3/K3 respectively.
Further, the battery pack modules are connected through a CAN communication line 3, the charging interfaces 5 are connected through CAN communication lines, and the main controller W1 is connected with the slave controller W2/W3 and the main controller W1 is connected with the charging interfaces 5 through CAN communication lines 3.
The system mainly realizes the high-rate charging of a high-capacity lithium battery multi-charger, the main control module in the high-voltage box controls the safe charging, and meanwhile, the problem of high-rate charging temperature rise of the battery is effectively solved.
Example 2:
the control method of the large-capacity battery pack charge-discharge control system arranged as in embodiment 1, comprising the steps of:
(1) the charging interface is connected with a charger, the main controller works, whether the battery pack module meets the charging permission condition or not is judged after self-checking, and if the battery pack module does not meet the charging permission condition, all charging relays are controlled to be disconnected; if the charging permission condition is met, the first discharging relay is switched off, and when the switching-off time of the first discharging relay is 3-5 seconds, the charging relay is pulled in to charge the battery pack module;
this is to prevent the discharge interface from being charged during charging, and therefore, the first discharge relay is required to be turned off during charging. Therefore, the state of the first discharging relay needs to be judged before charging, and the charging can be carried out after the off time of the first discharging relay reaches 3-5 seconds.
(2) After the charging end condition is met or a finished vehicle message is received, continuously monitoring the charging current of the battery pack module after 5 seconds, and when the current value A of the battery pack detected by the current sensor is smaller than a preset threshold value 5A, disconnecting the charging relay to stop charging; if the current value A is larger than the preset threshold value 5A and current still exists within 10 seconds, the main controller disconnects the charging relay to stop charging;
after the charging end condition is met or a finished vehicle message is received, the main controller communicates with the charger and sends a charging end command, and after the charger executes the charging end command, the power module in the charger needs 1 second to reduce the current from 400A to 0A; in order to ensure that the detection is normal, it is determined whether a charging current is present on the battery module 5 seconds after the charging command is ended.
(3) The whole vehicle control input loop drives the main controller to work, the main controller judges whether the battery pack module is in a discharging mode or not, if the battery pack module is not in the discharging mode and the second relay is attracted, the main controller detects the voltage difference of the battery pack, and when the voltage difference is 5-10V, the charging relay is attracted to charge; otherwise, stopping charging;
(4) if the battery pack module is in a discharging mode, all the charging relays are disconnected, the judgment of discharging permission conditions is entered, and if the discharging permission conditions are not met, the normally-closed relays are disconnected; and if the discharging permission condition is met, closing the second discharging relay, detecting the voltage difference of the battery pack from the controller, and attracting the first discharging relay to discharge when the voltage difference is 5-10V.
The charging permission conditions refer to that the charging interface is normally connected with the charger, the charger is normally communicated with the main controller, and the battery pack has no charging ending command.
The discharge permission condition refers to that the charging interface is not connected with the charger, the charging relay is disconnected and the battery pack works normally.
And controlling a high-capacity lithium battery pack formed by connecting a plurality of same battery pack modules in parallel to charge through a relay with a plurality of charging interfaces. In the multi-charging-interface charging mode, under the condition that the current of the battery pack module is not increased, the charging current of the high-capacity lithium battery pack is increased, the problem of heat loss caused by large-current charging is effectively solved, and the high-rate charging of the high-capacity lithium battery pack is realized; in addition, the high-capacity lithium battery pack can control partial battery pack work in a segmented implementation mode, and the problem of discharge capacity reduction caused by parallel connection of multiple battery packs is effectively solved.
Claims (6)
1. The utility model provides a large capacity group battery charge-discharge control system, includes whole car control input circuit, high-pressure tank and the large capacity group battery of being parallelly connected by two at least group battery modules, its characterized in that: the high-voltage box is internally provided with a main controller and a DC-DC power supply module, the outer end of the high-voltage box is provided with a charging interface and a discharging interface, and the number of the charging interfaces corresponds to the number of the battery pack modules one by one; the DC-DC power supply module is controlled by a finished automobile control input loop to supply power to the main controller;
the positive electrode of the charging interface is connected with the finished automobile control input loop through the charging relay, the battery pack module and the DC-DC power supply module in sequence, and the positive electrode of the discharging interface is connected with the finished automobile control input loop through the first discharging relay, the battery pack module and the DC-DC power supply module in sequence; the negative electrode of the charging interface and the negative electrode of the discharging interface are connected with the DC-DC power supply module; the main controller is connected with the high-capacity battery pack through a CAN communication line, and a normally closed relay is connected in series on the control input loop of the whole vehicle; and the charging relay, the first discharging relay and the normally closed relay are all connected with the signal end of the main controller.
2. A large capacity battery pack charge and discharge control system as claimed in claim 1, wherein: the battery pack module comprises a battery pack and a slave controller, the battery pack is connected to two ends of the DC-DC power supply module in parallel, and a fuse and a current sensor are connected between the battery pack and the DC-DC power supply module in series; the slave controller is connected with a signal end of a second discharging relay, and an output end of the second discharging relay is connected with a positive electrode of the charging interface through the charging relay.
3. A large capacity battery pack charge and discharge control system as claimed in claim 1, wherein: the battery pack modules are connected through CAN communication lines, the charging interfaces are connected through CAN communication lines, and the main controller is connected with the slave controllers and the charging interfaces through CAN communication lines.
4. A control method of a charge and discharge control system for a large capacity battery pack according to claim 1, characterized in that: the method comprises the following steps:
(1) the charging interface is connected with a charger, the main controller works, whether the battery pack module meets the charging permission condition or not is judged after self-checking, and if the battery pack module does not meet the charging permission condition, all charging relays are controlled to be disconnected; if the charging permission condition is met, the first discharging relay is switched off, and when the switching-off time of the first discharging relay is 3-5 seconds, the charging relay is pulled in to charge the battery pack module;
(2) after the charging end condition is met or a finished vehicle message is received, continuously monitoring the charging current of the battery pack module after 5 seconds, and when the current value A of the battery pack detected by the current sensor is smaller than a preset threshold value 5A, disconnecting the charging relay to stop charging; if the current value A is larger than the preset threshold value 5A and current still exists within 10 seconds, the main controller disconnects the charging relay to stop charging;
(3) the whole vehicle control input loop drives the main controller to work, the main controller judges whether the battery pack module is in a discharging mode or not, if the battery pack module is not in the discharging mode and the second relay is attracted, the main controller detects the voltage difference of the battery pack, and when the voltage difference is 5-10V, the charging relay is attracted to charge; otherwise, stopping charging;
(4) if the battery pack module is in a discharging mode, all the charging relays are disconnected, the judgment of discharging permission conditions is entered, and if the discharging permission conditions are not met, the normally-closed relays are disconnected; and if the discharging permission condition is met, closing the second discharging relay, detecting the voltage difference of the battery pack from the controller, and attracting the first discharging relay to discharge when the voltage difference is 5-10V.
5. The control method according to claim 4, characterized in that: the charging permission condition in the step (1) refers to that the charging interface is normally connected with the charger, the charger is normally communicated with the main controller, and the battery pack has no charging finishing command.
6. The control method according to claim 4, characterized in that: and (4) the discharging permission condition refers to that the charging interface is not connected with a charger, the charging relay is disconnected and the battery pack works normally.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911176881.1A CN110843599A (en) | 2019-11-26 | 2019-11-26 | High-capacity lithium battery pack charging and discharging control system and control method thereof |
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| CN201911176881.1A CN110843599A (en) | 2019-11-26 | 2019-11-26 | High-capacity lithium battery pack charging and discharging control system and control method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112737013A (en) * | 2020-12-18 | 2021-04-30 | 中国科学院青岛生物能源与过程研究所 | Multi-power-supply system and operation method thereof |
| CN114243832A (en) * | 2021-12-14 | 2022-03-25 | 青岛特来电新能源科技有限公司 | Charging system and charging device |
| CN115001070A (en) * | 2022-05-17 | 2022-09-02 | 珠海科创电力电子有限公司 | Energy management system of single PCS sharing multi-battery cluster |
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Application publication date: 20200228 |