| Type: | Development Board |
|---|---|
| Certification: | None |
| Demo Board Type: | Arm |
| Trademark: | Waveshare |
| Origin: | China, Mainland China |
| Customization: |
|---|
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The price of this product will be adjusted on January 1, 2022 due to the serious shortage of chips in the market and the increase in the price of production and R&D labor costs. Sorry for the inconvenience
The company solemnly declares that:
The program circuit of this product is only for learning and project reference. Without the company's permission, it is not allowed to resell materials, commercial use or any other use. The company has applied for intellectual property rights, and will be held accountable for any infringement
Video sharing: play/u/2208399750138/p/1/e/6/t/1/325333807743.mp4
Some buyers say the price is high. Why?
1. This BMS battery management is a four layer control board designed based on the vehicle specifications. Except for CPU, other chips are mainly based on the vehicle specifications. PCB board printing+chip procurement+welding production cycle is long and costly
2. The R&D process includes circuit design, PCB design, proofing, welding, hardware debugging, software low-level driver writing and debugging (read each chip manual and protocol), application layer writing and protocol formulation, upper computer design, etc., which requires high human resources and time, and the R&D cost will naturally be high
3. Value evaluation: one software engineer and one hardware engineer with at least ten years of work experience, each person has accumulated three months of development time, and the cost can be calculated according to the market value
4. This package is for the sale of design and development plans. If your company develops from scratch, draws circuit boards, welds and debugs, writes software bottom and application layers, debugs the environment, and develops the upper computer, it is difficult for two people to complete it in three months, and this cost is not worth mentioning compared with the price of more than 3000 Excuse me, is it expensive?
Note: Since LTC6811 is out of stock, subsequent BMS boards use LTC6804 chips, and the performance of the two chips is almost the same
STM32F407+LTC6811 Lithium Battery Management System
Package 1: BMS control board SLMC602+analog battery board+Chuangxin Technology CAN card+DCDC power supply+shunt
Package 2: BMS control board SLMC602+analog battery board+Chuangxin Technology CAN card+DCDC power supply+shunt+J-Link simulator
Package 3: BMS control board SLMC602+Chuangxin Technology CAN card+DCDC power supply+battery box board
Package 4: BMS control board SLMC602+Chuangxin Technology CAN card+DCDC power supply+J-Link emulator+battery box board
Package 5: BMS control board SLMC602+analog battery board+Chuangxin Technology CAN card+DCDC power supply+shunt+J-Link emulator+IOT Internet of Things module
Package 6: BMS control board SLMC602+Chuangxin Technology CAN card+DCDC power supply+J-Link emulator+battery box board+IOT Internet of Things module
Delivery materials: circuit diagram (PDF)+program source code+upper computer execution program+communication protocol+SLMC602 board sub manual+each chip manual+others
The original code of the upper computer of CAN communication will be presented after the praise of five stars+cross and above with pictures
Must read before buying:
1. As this kit contains specific knowledge value information, once sold, it will not provide return and refund services
2. The price of our development board kit is not negotiable
3. The information, source code and circuit diagram of our store are not sold separately. The existing packages can be selected. Customers are not allowed to match the packages at will
4. This BMS battery management kit is recommended to have some experimental applications based on SCM, circuit and C language programming. There is no doubt that the new energy BMS battery management R&D engineers in the market are highly paid
5. We will debug and distribute the kit only after the order is placed, so it should be delivered within 3 days after payment
6. This program circuit is only for learning and project reference. The company has applied for the intellectual property certificate for reselling materials, commercial use and any other use without the company's permission. The company will be held responsible for any infringement
1. Introduction
This reference design is a lithium battery management system based on the single voltage acquisition chip of LINLITE LTC6811, with a single voltage acquisition accuracy of up to 16 bits and a maximum measurement error of 1.2mV. A single chip can monitor up to 12 strings of cells at the same time. This design uses two LTC6811 chips connected via the isos interface in daisy chain mode, which can manage up to 24 strings of cells at the same time. The system uses the main control chip of the Cortex-M4 core with high-speed computing and processing capability of STM32F407. The total battery voltage, The total current uses a 24 bit high precision AD acquisition chip Two channels of CAN communication, one channel of isolated CAN can be used for communication between VCUs, and the other channel of non isolated CAN can be used for communication with the charger. Through this channel of CAN, the BMS internal data (single voltage, total voltage, total current, temperature, alarm, etc.) is sent to the PC upper computer It also has two RS485 communication channels, one of which is used for the communication between IoT modules. It can send the BMS internal data to the network, which can monitor the working status of the battery pack remotely in real time. The system has five relay control loops (discharge, charge, pre charge, heating, fan)
2. Scope of application
1. Engineering vehicles (24V 48V 60V 80V system)
2. Low voltage energy storage system (24V 48V 60V 80V energy storage system)
3. UPS lithium battery pack
3. Features
3.1 Two pieces of LTC6811 are connected, and up to 24 strings of electric cells are monitored at the same time (accuracy: 2mV)
3.2 Two CAM communications (one with VCU and one with charger
3.3 It has five relay control circuits
3.4 Support 100mA battery equalizing current
3.5 Six channel temperature acquisition
3.6 24 bit AD chip is used for total voltage and current (accuracy less than 1%)
4. System design
4.1 System diagram
As shown in the figure above, the grey part is the BMS control management system The main control adopts the high-speed ARM series STM32F407 chip, and reads and controls two LTC6811 chips connected by daisy chain in the isolated 4-wire SPI communication mode It can manage up to 24 series of cells and has the equalization function, which can start equalization when the voltage of each series of cells is high, so that the residual capacity of each cell is close to the same. The total voltage and current are collected and calculated using a 24 bit AD chip. The shunt is configured with a resistance of 0.0005 ohms by default. In addition, it includes five relay controls (discharge, charge, pre charge, heating, fan, etc.) The system uses isolated and non isolated CAN communication to communicate with VCU and PC, and sends the internal data of BMS to the vehicle or PC
4.2 Battery management chip
LTC6811 car gauge chip of Lalealt is used for battery unit monitoring to read battery status in isolated SPI communication mode. The chip features are as follows
It can measure up to 12 batteries in series;
The maximum measurement error is 1.2mV;
Stackable architecture, built-in isoSPI ™ Interface;
1Mb isolated serial communication;
Available at 290 μ Complete the measurement of all batteries in the system within s;
16 bit with programmable third-order noise filter ΔΣ ADC;
5 general digital I/O or analog inputs;
With temperature sensor interface input;
four μ A Sleep mode power current;
Design the system according to ISO26262 standard;
4.3 CPU master chip
STM32F407 of STM32F407, a Cortex with operating frequency up to 168 MHz and 32 bits, is selected as the main controller ™- M4 core (with floating point unit) is a high-speed, high-performance chip
512KB~1MB Flash and 192KB SRAM
Supports FPU (floating point operation) and DSP instructions
3 12 bit ADs [up to 24 external test channels]
Two 12 bit DAs
3-way I2C communication peripheral
6-channel UART serial communication
3-way 4-wire SPI communication
2-way CAN2.0 communication
Three low power consumption modes: sleep, stop and standby
4.4 24 bit AD total voltage and current detection chip
The 24 bit ADI chip is used to detect the total voltage and current of the battery pack. The chip has a voltage acquisition channel and a current acquisition channel
4.5 Isolated CAN chip
The isolation CAN communication chip uses the vehicle specification TJA1052I, which is a high-speed CAN transceiver. The transceiver provides a controller area network (CAN) protocol controller and a physical two-wire CAN bus between electrically isolated interfaces. It is specially designed for electric vehicles (EVs) and hybrid electric vehicles (HEVs)
4.6 Non isolated CAN chip
The isolation CAN communication chip uses the vehicle gauge TJA1040, which is a high-speed (up to 1Mbit) CAN transceiver, mainly used for differential transmission and reception of data for the automotive industry
4.7 RS485 communication chip
4.8 EEPROM chip
The system uses 512M EEPROM memory chip to store the data after the BMS system is powered down
5. Interface description
5.1 J1 power interface (POWER interface)
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