Introduction

What is Li-ion battery BMS? Why does Energy storage lithium ion battery need BMS?

Why does a home battery storage system need a management system?
Lifep04 lithium battery is widely used in long-time standby remote monitoring instruments because of its high working voltage, small size, light weight, high energy density, no memory effect, no pollution, small self-discharge, and long cycle life. Compared with Ni-MH batteries, lithium-ion batteries are 30-40% lighter and have a 60% higher energy ratio. However, lifep04 lithium battery also has serious flaws, which can be summarized in the following two aspects:
(1) safety
Lithium-ion batteries are poor in safety and have defects such as explosions. In particular, lithium-ion batteries that use lithium cobalt oxide as the positive electrode material cannot be discharged under high current, and their safety is poor. In addition, overcharging or overdischarging almost all lithium-ion batteries will cause irreversible damage to the battery.
Lithium-ion batteries are also very sensitive to temperature: if the temperature is too high, the electrolyte may decompose, burn or even explode; if the temperature is too low, the performance of lithium-ion batteries will deteriorate significantly, affecting the normal use of equipment.
Due to the limitations of the lithium-ion battery manufacturing process, the internal resistance and capacity of each battery will vary. When multiple lithium-ion batteries are used in series, the charging and discharging rates of each battery are inconsistent, resulting in low battery capacity utilization. In view of this, in the actual use of lithium-ion batteries, a special protection system is required to monitor the health of the batteries, so as to manage the use of lithium-ion batteries.
(2) Maintainability
At low temperatures, capacity fade and power cannot be accurately predicted, which makes the equipment less maintainable. Long-term online instruments need to be replaced regularly, and remote monitoring equipment works in scattered locations, and the distance between each location is long, so the workload and cost of battery replacement are very high.
In order to reduce the maintenance workload and reduce maintenance costs, the lithium-ion battery management system must have an accurate power state estimation function, accurately grasp the power state of the lithium-ion battery, and perform battery replacement in a more targeted manner. At the same time, the lithium-ion battery management system should have lower power consumption to reduce maintenance frequency and extend battery life. Therefore, a reasonable design of the lithium-ion battery management system is of great significance to the maintenance of long-term continuous power supply remote monitoring instruments.

The BMS independently designed by Pcenersys has advanced technology:

Pcenersys battery security features:
1. Battery safety management: with reliable overcharge/overdischarge protection, overcurrent/overtemperature/low temperature protection, multi-level fault diagnosis protection;
2. High-voltage safety management: with high-voltage relay adhesion detection, high-voltage interlock detection with high anti-interference, advanced high-voltage insulation monitoring;
3. Possess the disconnection diagnosis function of the voltage and temperature acquisition line;
4. The battery voltage acquisition module has safety mechanisms such as circuit overcurrent and short circuit protection, and the circuit is more reliable;
5. With flexible configuration of 5~36 strings and 5~48 strings all-in-one machine, it is suitable for all kinds of mainstream methods in the industry;
Stable quality:
1. All components are selected from automotive grade components, with a high standard operating temperature range of -40°C~85°C;
2. Wider and more reliable temperature monitoring, the monitoring range can reach -40~125℃;
Conforms to standard specification:
1. Support charging national standard GBT20234-2015 and GBT27930-2015;
2. Support the requirements of product functional safety lifecycle management in the ISO26262 international safety standard;
3. Support CCP calibration protocol, UDS, OBD-ii diagnostic protocol.

Summarize: