Multi-group lithium battery information state monitoring method

Abstract

The invention relates to a multi-group lithium battery information state monitoring method, a BMS verification interface of a lithium battery is composed of an output OUT and an output IN, when the OUT is connected with an IN1, identification bit filling data of a specific ID data area is set to be 1, and it is indicated that the lithium battery is defined as a first lithium battery pack after being matched with a vehicle; after the OUT is connected with the IN2, the identification bit filling data of the specific ID data area is set to be 2, which means that the lithium battery is defined as a No.2 lithium battery pack after being matched with the vehicle, and so on; after the display unit receives an ID code sent by the BMS from the CAN bus, when the first byte is analyzed to be filled as 1b, the ID is sent by the first lithium battery pack BMS, the voltage, temperature and capacity information of an ID data field is analyzed, the position of the first lithium battery pack on a display interface is displayed, and when the first byte is analyzed to be filled as 2b, the ID is sent by the second lithium battery pack BMS. According to the invention, the load rate of the CAN bus of the vehicle is reduced, and the consistency of the states of the lithium batteries and the complexity that the display unit needs different display programs for each lithium battery are ensured.

Description

Technical Field

[0001] The invention relates to a monitoring method, and in particular to a method for monitoring the information status of multiple groups of lithium batteries. Background Art

[0002] The vehicle uses the CAN bus network to realize information exchange between various vehicle components. The lithium battery power management system (BMS) sends a specific ID (unique identification code) message to the display unit through the CAN bus. The display unit receives the ID message and displays the voltage, temperature, capacity and other information of the lithium battery after parsing. In order to ensure the uniformity of technical status, the specific ID message sent by the BMS is the same. When multiple BMS send the same ID message information through the CAN bus at the same time, the display unit cannot distinguish and parse the message information sent by each BMS, and thus cannot correctly display the voltage, temperature and capacity of each lithium battery. Summary of the invention

[0003] The purpose of the present invention is to develop a mutual verification method for a lithium battery power management system. When matching multiple groups of lithium batteries, the verification signal is identified through the verification interface of the lithium battery power management system. When different verification signals are identified, they are filled into the identification bits of a specific ID data area. Although the ID messages sent by different BMSs are the same, the data domain identification bits are different. The display unit parses the data identification bits, thereby correctly displaying information such as the voltage, temperature and capacity of each lithium battery.

[0004] The present invention is achieved by the following technical solutions:

[0005] A method for monitoring the information status of multiple groups of lithium batteries, wherein the BMS verification interface of the lithium battery is composed of an output OUT and an output IN. When OUT and IN1 are connected, the identification bit filling data of the specific ID data area is set to 1, indicating that the lithium battery is defined as a No. 1 lithium battery group after matching with the vehicle; when OUT and IN2 are connected, the identification bit filling data of the specific ID data area is set to 2, indicating that the lithium battery is defined as a No. 2 lithium battery group after matching with the vehicle, and so on.

[0006] When the display unit receives the ID code sent by the BMS from the CAN bus, if the first byte is parsed and filled with 1b, the ID is sent by the BMS for the No. 1 lithium battery pack. The voltage, temperature and capacity information of the ID data field are parsed and displayed at the No. 1 lithium battery pack position on the display interface. If the first byte is parsed and filled with 2b, the ID is sent by the BMS for the No. 2 lithium battery pack. The voltage, temperature and capacity information of the ID data field are parsed and displayed at the No. 2 lithium battery pack position on the display interface, and so on.

[0007] The meaning of the ID code sent by the BMS is customized, and the unused bytes and bits represent the identification bit, temperature, output voltage and battery capacity information respectively.

[0008] Customize the ID code to reserve byte and bit information.

[0009] The present invention can correctly display the voltage, temperature, capacity and other information of each group of lithium batteries through the verification interface identification function of the lithium battery BMS. In addition, each lithium battery BMS only needs to send the same ID, and each lithium battery BMS does not need to send a different ID, which greatly reduces the load rate of the vehicle CAN bus and ensures the consistency of the lithium battery status and the cumbersomeness of the display unit needing to display different display programs for each lithium battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the information status monitoring system of multiple groups of lithium batteries of the present invention. DETAILED DESCRIPTION

[0011] The present invention is a method for monitoring the information status of multiple groups of lithium batteries. The block diagram of the system for monitoring the information status of multiple groups of lithium batteries is as follows: Figure 1 shown.

[0012] The BMS verification interface of the lithium battery consists of output OUT and output IN. When OUT and IN1 are connected, the specific ID data area identification bit filling data is set to 1, indicating that the lithium battery is defined as a No. 1 lithium battery pack after matching the vehicle; when OUT and IN2 are connected, the specific ID data area identification bit filling data is set to 2, indicating that the lithium battery is defined as a No. 2 lithium battery pack after matching the vehicle, and so on. The specific ID message sent by the lithium battery BMS is shown in Table 1.

[0013] Table 1 Lithium battery BMS message

[0014]

[0015] The display interface of the display unit is shown in Table 2.

[0016] Table 2 Display unit display interface

[0017]

[0018]

[0019] Beneficial effects of the present invention:

[0020] 1. By verifying the information of the lithium battery BMS interface, the status information of each lithium battery can be correctly displayed while ensuring the consistency of the lithium battery technical status, that is, the program.

[0021] 2. When the lithium battery needs to be replaced, the status information of the lithium battery can be displayed on the display unit as long as the calibration interface is correctly connected, and there is no need to update or upgrade the display unit program.

Claims

1. A method for monitoring the information status of multiple groups of lithium batteries, characterized by: The BMS verification interface of the lithium battery consists of output OUT and output IN. When OUT and IN1 are connected, the identification bit filling data of the specific ID data area is set to 1, indicating that the lithium battery is defined as a No. 1 lithium battery pack after matching the vehicle; when OUT and IN2 are connected, the identification bit filling data of the specific ID data area is set to 2, indicating that the lithium battery is defined as a No. 2 lithium battery pack after matching the vehicle, and so on; When the display unit receives the ID code sent by the BMS from the CAN bus, if the first byte is parsed and filled with 1b, the ID is sent by the BMS for the No. 1 lithium battery pack. The voltage, temperature and capacity information of the ID data field are parsed and displayed at the No. 1 lithium battery pack position on the display interface. If the first byte is parsed and filled with 2b, the ID is sent by the BMS for the No. 2 lithium battery pack. The voltage, temperature and capacity information of the ID data field are parsed and displayed at the No. 2 lithium battery pack position on the display interface, and so on.

2. A method for monitoring the information status of multiple groups of lithium batteries according to claim 1, characterized in that: The meaning of the ID code sent by the BMS is customized, and the unused bytes and bits represent the identification bit, temperature, output voltage and battery capacity information respectively.

3. A method for monitoring the status of multiple lithium batteries according to claim 1, characterized in that: Customize the ID code to reserve byte and bit information.

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