How does the power battery system effectively stabilize the network?
[Guide]Power battery is one of the core components of new energy vehicles, and its safety and stability are very important to the power performance of electric vehicles. CAN-bus communication plays an important role in it. So, how to efficiently and stably realize the CAN-bus networking of the power battery system?
In response to the national goal of “carbon neutrality” and “carbon peaking”, new energy electric vehicles are bound to be the general trend, and major car companies are in full swing, resulting in the current “a hundred schools of thought” scene. With the rapid development of my country’s new energy vehicle market, as its core component, power batteries have a growing demand gap. By 2025, the global annual sales of new energy vehicles will exceed 15 million, and the demand for power batteries will exceed 900GWh. The power battery field has become a battleground for major battery manufacturers.
(The picture comes from the Internet)
Friends in the automotive-related industries all know that CAN bus is the bus standard for communication between automotive Electronic control units. Now almost all automobile manufacturers are choosing to use CAN bus communication. The essential power battery on new energy vehicles is also connected to the vehicle CAN/CANFD network through the CAN/CANFD network.
The power battery pack is a battery module composed of multiple single cells in series. Due to the inconsistency of the capacity of a single battery in the power battery pack, the battery pack will be out of balance after several charge and discharge cycles. In order to better realize the battery of the power battery pack Real-time monitoring of physical parameters, battery status estimation, online diagnosis and early warning, charge and discharge and pre-charge control, balance management and thermal management, etc., require unified management by the BMS battery management system.
Can-bus networking scheme for power battery pack system
The power battery used in new energy vehicles has a higher voltage, and its output voltage usually reaches 300V, or even as high as 600V. The CAN bus in the BMS battery management system has a huge communication combination, and there is a certain voltage difference between different battery pack subsystems. The BMS of each battery pack uses the battery pack ground as the system reference ground for battery pack data sampling. The ground potential is different, and the connection between each other will cause great signal interference. Through the traditional CAN twisted pair networking, the electrical connection wires are bundled, and there is a high probability that communication failures will occur due to interference.
In response to the above-mentioned problems, ZHIYUAN Electronics has proposed an effective solution.
Industry users can use CANWIFI-200T WIFI to CAN device for interconnection, or use CANSwitch-AF2S2 fiber to CAN device for interconnection.
Among them, optical fiber is the most reliable communication method with anti-interference ability, and the optical fiber interface completely isolates any interference.
High-performance WiFi to CANFD device-CANFDWIFI-100U
The CANFDWIFI-100U product integrates a high-speed 528MHz main frequency M7 core processor, and internally integrates a CAN(FD) interface with a maximum baud rate of 5Mbps, a 10M/100M adaptive Ethernet interface and a 2.4G/5G WiFi The interface supports multiple working modes such as TCP Server, TCP Client, and UDP. Users can flexibly choose TCP Sever/TCP Client/UDP working mode and topological structure according to their needs. The configuration software can complete the required parameter settings.
● The perfect combination of high-speed CANFD and high-speed 5.8GHz WiFi
CANFDWIFI-100U integrates 2.4G, 5G WLAN interfaces, conforms to IEEE 802.11a/b/g/n/ac standards, and can flexibly select AP/Station mode to complete the interconnection and intercommunication of CAN FD network and WiFi network.
● Support AP/Station mode to meet a variety of application scenarios
By separately built-in CANFDWIFI-100U converters to complete the handshake matching, users can flexibly select the AP/Station mode to access the network as a hotspot/client.
● Support high-speed CANFD, compatible with CAN2.0A/B
The CANFDWIFI-100U product supports the ISO/Bosch CAN FD standard and is compatible with CAN2.0A/B mode transmission and reception. The data domain baud rate can be configured to 5Mbps, and the data length can be configured to 64 bytes. It can provide more than CAN2.0A/ B 40 times higher data load provides faster control and data channels for automotive electronics, rail transit, and medical electronics applications.
● Small size, excellent performance
The high-performance WiFi to CAN FD device is exquisite and small in size, which is convenient for users to easily implement device integration and complete the expansion of CAN network. As shown in Figure 8, the longest length of the device is approximately 3.3 times that of a dollar coin.
● TCP keep-alive mechanism makes the connection more reliable
The TCP Server/Client mode connection has a built-in TCP keep-alive mechanism to ensure that the TCP connection is reliable. After the network is disconnected, it will automatically reconnect and establish a TCP connection stably.
● Black and white list mode effectively reduces the load
The configuration tool supports efficient filtering of each channel, and users can flexibly set black and white lists according to the required messages to achieve efficient use of data.
For a detailed introduction of CANFDWIFI-100U, please click the link: https://www.zlg.cn/can/can/product/id/260.html
ZLG Zhiyuan Electronics has rich experience in power battery testing, networking, and recycling. It has also proposed various solutions to help the industry process of the power battery industry. For more details, please follow the official account of “ZLG Zhiyuan Electronics” for more details. More industry CAN/CANFD bus solutions.
Source: ZLG Zhiyuan Electronics
The Links: EL552256-Q1 CS8900A-CQZ