Lithium battery system for industrial electric vehicle

Abstract

The utility model provides a lithium battery system for an industrial electric car, which comprises a battery cell unit formed by connecting a plurality of lithium batteries in series; the CELL acquisition system is used for acquiring operation data of all lithium batteries; the BMS battery controller is in communication connection with the CELL acquisition system; the BMS battery controller comprises a charging / discharging control module, the charging / discharging state of the lithium battery is switched by controlling closing / opening of a relay, the relay is cut off when the lithium battery breaks down, and output of the lithium battery is stopped. The battery cell acquisition module is used for acquiring operation data of the BMS battery controller and the lithium battery through a sensor; the storage module is internally provided with a storage unit and is used for recording operation data of the lithium battery; the communication module is internally provided with a remote communication module and is used for transmitting operation data of the lithium battery to a remote terminal; according to the utility model, the daisy chain communication technology is adopted, the use of components is reduced, the cost is reduced, and the communication efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to industrial electric car lithium battery technical field especially relates to a lithium battery system for industrial electric car. BACKGROUND

[0002] At present, daisy chain cell sampling scheme architecture is mostly used in electric vehicle field, and has not been applied to industrial electric car lithium battery.

[0003] In daisy chain communication, the wiring scheme of connecting devices through cable makes only adjacent devices can directly communicate, reduces hardware components such as CAN transceiver and MCU, realizes cost reduction and communication efficiency improvement, in addition, the topology structure of daisy chain allows the microcontroller on the mainboard to communicate with the sampling chip on the slave board through SPI communication interface, reduces the number of MCUs on the mainboard and slave board.

[0004] If daisy chain communication technology can be applied in industrial electric car lithium battery, it has important significance for improving the use efficiency and safety of lithium battery. SUMMARY

[0005] The utility model discloses a lithium battery system for industrial electric car.

[0006] In order to realize the above-mentioned purpose, the technical scheme of the utility model is:

[0007] A lithium battery system for industrial electric car, characterized by comprising

[0008] Battery cell unit, which is composed of a plurality of lithium batteries in series;

[0009] CELL collection system, which collects the operation data of all lithium batteries;

[0010] BMS battery controller, which is in communication connection with the CELL collection system;

[0011] The BMS battery controller comprises

[0012] Charge / discharge control module, which switches the charge / discharge state of lithium battery by controlling the closing / opening of relay, cuts off the relay and stops the output of lithium battery when lithium battery fails;

[0013] Cell collection module, which collects the operation data of BMS battery controller and lithium battery through sensor;

[0014] Storage module, which has built-in storage unit and records the operation data of lithium battery;

[0015] Communication module, which has built-in remote communication module and transmits the operation data of lithium battery to remote terminal.

[0016] Further, the battery cell acquisition module comprises a voltage acquisition module, a current acquisition module and a temperature acquisition module, and the voltage, current and temperature data of the BMS battery controller and the lithium battery are acquired through the voltage acquisition module, the current acquisition module and the temperature acquisition module.

[0017] Further, the CELL acquisition system is connected with the BMS battery controller through an SPI communication protocol.

[0018] Further, the CELL acquisition system is installed on a battery cell sampling CELL expansion board, the BMS battery controller is installed on a BMS main control board, and the battery cell sampling CELL expansion board and the BMS main control board are connected through a quick connector.

[0019] The daisy chain communication technology is adopted in the BMS management system, which is an effective battery cell acquisition scheme, can reduce the use of components, and realizes cost reduction and communication efficiency improvement. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a circuit structure diagram of the utility model;

[0021] Figure 2 It is a battery cell unit communication logic diagram of the utility model;

[0022] Figure 3 It is a BMS battery controller structure diagram of the utility model.

[0023] Reference signs:

[0024] 1 CELL acquisition system, 2 BMS battery controller,

[0025] 21 charge control module, 22 discharge control module, 23 storage module, 24 communication module,

[0026] 25 voltage acquisition module, 26 current acquisition module, 27 temperature acquisition module. DETAILED DESCRIPTION

[0027] The technical scheme of the utility model will be described clearly and completely in combination with the drawings. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0028] The embodiment discloses a lithium battery system for industrial electric cars, which comprises a BMS battery controller and a battery cell sampling CELL expansion board. Figure 1As shown, including battery cell unit, CELL collection system 1 and BMS battery controller 2.

[0029] The battery cell unit adopts an independent 58V battery pack structure, which is composed of 18 series of lithium iron phosphate batteries. The battery pack collects the running data of all lithium batteries through an external independent CELL collection system 1. The battery cell unit transmits the data to the master control unit through the SPI communication mode. The communication logic is as shown in Figure 2 .

[0030] The battery cell unit adopts the operation mode of BMS master control through the SPI communication protocol. The BMS master control integrates voltage, current and temperature related data collection, lithium battery pack charging and discharging control, running data storage and remote interactive communication. See Figure 3 .

[0031] The BMS battery controller 2 includes a cell collection module, a charging control module 21, a discharging control module 22, a storage module 23 and a communication module 24. The cell collection module collects the running data of the BMS battery controller 2 and the lithium battery through sensors, providing data support for the SOC and SOH calculation of the lithium battery.

[0032] The cell collection module includes a voltage collection module 25, a current collection module 26 and a temperature collection module 27. The voltage, current and temperature data of the BMS battery controller 2 and the lithium battery are collected through the voltage collection module 25, the current collection module 26 and the temperature collection module 27.

[0033] The BMS battery controller 2 includes a charging control module 21 and a discharging control module 22. The charging control module 21 and the discharging control module 22 switch the charging / discharging state of the lithium battery by controlling the closing / opening of the relay. When the lithium battery fails, the relay is cut off to stop the output of the lithium battery to protect the lithium battery.

[0034] The storage module 23 has a built-in storage unit. The storage unit records the running data of the lithium battery. When in use, the running data of the lithium battery can be restored through external equipment to achieve the purpose of lithium battery running data analysis and fault analysis.

[0035] The communication module 24 has a built-in remote communication module 24. The running data of the lithium battery is transmitted to the remote terminal. When in use, the running data of the lithium battery can be monitored in real time in the background to ensure the safe operation of the lithium battery.

[0036] The battery cell unit and the BMS battery controller 2 of the embodiment are separated and independent. The battery cell unit adopts a cell sampling CELL expansion board, and the BMS battery controller 2 adopts a BMS master control board. The cell sampling CELL expansion board and the BMS master control board are connected through a quick connector, which is convenient for installation and disassembly.

[0037] The single cell sampling CELL expansion board can support the monitoring of 24S single battery voltage and the detection of 12 temperature points, and supports a 2-wire SPI communication protocol; the single BMS master control board can support the monitoring of 12S battery voltage and the detection of 6 temperature points, and supports a 2-wire SPI communication protocol; according to specific voltage requirements and use scenarios, the number of cell sampling CELL expansion boards can be reduced or increased.

[0038] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A lithium battery system for industrial electric vehicles, characterized by, Comprising Battery cell units, composed of several lithium batteries in series; CELL collection system (1), collecting the operation data of all lithium batteries; BMS battery controller (2), in communication connection with CELL collection system (1); The BMS battery controller (2) comprises Charge / discharge control module, switching the charge / discharge state of lithium batteries by controlling the closing / opening of relays, cutting off the relays and stopping the output of lithium batteries when faults occur; Cell collection module, collecting the operation data of BMS battery controller (2) and lithium batteries through sensors; Storage module (23), with built-in storage unit, recording the operation data of lithium batteries; Communication module (24), with built-in remote communication module, transmitting the operation data of lithium batteries to remote terminals.

2. The lithium battery system for industrial electric vehicles according to claim 1, characterized in that, The cell collection module comprises voltage collection module (25), current collection module (26) and temperature collection module (27), collecting the voltage, current and temperature data of BMS battery controller (2) and lithium batteries through the voltage collection module (25), current collection module (26) and temperature collection module (27).

3. The lithium battery system for industrial electric vehicles according to claim 1, characterized in that, The CELL collection system (1) is in communication connection with BMS battery controller (2) through SPI communication protocol.

4. The lithium battery system for industrial electric vehicles according to claim 1 or 3, characterized by The CELL collection system (1) is installed on the cell sampling CELL expansion board, the BMS battery controller (2) is installed on the BMS main control board, and the cell sampling CELL expansion board and the BMS main control board are connected through a quick connector.

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