CN211252276U - Charge-discharge control system of large-capacity lithium battery pack - Google Patents

Charge-discharge control system of large-capacity lithium battery pack Download PDF

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Publication number
CN211252276U
CN211252276U CN201922087826.7U CN201922087826U CN211252276U CN 211252276 U CN211252276 U CN 211252276U CN 201922087826 U CN201922087826 U CN 201922087826U CN 211252276 U CN211252276 U CN 211252276U
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battery pack
charging
relay
interface
discharging
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CN201922087826.7U
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崔爱龙
江博
张�杰
张华俊
张军
代志家
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Anhui Heli Co Ltd
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Anhui Heli Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/70Energy storage systems for electromobility, e.g. batteries

Abstract

The utility model provides a large capacity lithium cell group charge-discharge control system, including whole car control input loop, high-voltage box and by the large capacity group battery that at least two group battery modules are parallelly connected, high-voltage box inside is equipped with main control unit, DC-DC power module, the outer end of high-voltage box is equipped with charging interface and discharge interface, DC-DC power module is controlled by whole car control input loop and supplies power for main control unit; 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 DC-DC power supply module and the finished automobile control input loop through the first discharging relay and the battery pack 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

Charge-discharge control system of large-capacity lithium battery pack
Technical Field
The utility model relates to a lithium cell technical field, concretely relates to large capacity lithium cell group charge-discharge control system.
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.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a large capacity group battery charge-discharge control system carries out the interface that charges more through the relay and charges, has increased the charging current of large capacity lithium cell group to avoid the heat loss problem that heavy current charging brought effectively, realized that large multiplying power of large capacity group battery charges.
The technical scheme of the utility model as follows:
a charge-discharge control system of a high-capacity lithium battery pack comprises a finished automobile control input loop, a high-voltage box and the 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 inside the high-voltage box, the outer end of the high-voltage box is provided with a charge interface and a discharge interface, and the number of the charge 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 whole vehicle control input loop in the system is a control system of the vehicle, and is connected with the large-capacity battery pack of the utility model to send control signals to the DC-DC power module and the main controller.
The utility model discloses an on the basis of a plurality of the same group battery parallel connection become the group battery module, through basic information such as the voltage of battery management system collection group battery module, electric current, control carries out the interface that charges more through the relay by the parallelly connected large capacity lithium cell group of constituteing of a plurality of the same group battery modules and charges. 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 utility model can realize the random arrangement of the large-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 schematic structural diagram 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 charge-discharge control system of a high-capacity lithium battery pack comprises a finished automobile control input loop 1, a high-voltage box 2 and the 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.
The working process is as follows:
(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 (3)

1. The utility model provides a large capacity lithium cell group charge-discharge control system, includes whole car control input circuit, high-voltage box 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. The charge and discharge control system for a high capacity lithium battery pack according to 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. The charge and discharge control system for a high capacity lithium battery pack according to 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.
CN201922087826.7U 2019-11-26 2019-11-26 Charge-discharge control system of large-capacity lithium battery pack Active CN211252276U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110843599A (en) * 2019-11-26 2020-02-28 安徽合力股份有限公司 High-capacity lithium battery pack charging and discharging control system and control method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110843599A (en) * 2019-11-26 2020-02-28 安徽合力股份有限公司 High-capacity lithium battery pack charging and discharging control system and control method thereof

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