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Composition of battery cell system
Battery Pack Technology Roadmap
Battery Pack
At present, the battery packs used for household energy storage are mainly lithium iron phosphate batteries, which are mainly composed of: battery cells BMS、 Composed of shell, Fuse, etc
Battery Pack
1. Cell
A battery cell is an important component of a battery system, usually referring to a single electrochemical cell containing positive and negative electrodes, and is generally not used directly.
The material of the battery cell is the gene of the battery, that is, what kind of performance the battery has, and the material of the battery cell plays a fundamental role;
At present, lithium-ion batteries are widely used, mainly including lithium iron phosphate and ternary lithium. Lithium ion batteries are mainly composed of positive electrode materials, negative electrode materials
Composed of electrolyte, diaphragm, and casing.
Battery Pack
1. Cell
The common types of battery cells for household energy storage currently include：
In household energy storage systems, square aluminum shell cells are the most widely used, followed by soft packs, and finally cylindrical cells;
Overcharging of soft pack battery cells can easily cause swelling. In addition to special requirements for appearance design, such as thickness requirements for battery packs, square aluminum shells are generally used;
Cylindrical battery cells are generally designed with high magnification, and are mostly used in power applications or high magnification energy storage scenarios;
2. BMS
BMS (Battery Management System), commonly known as battery nanny or battery manager, is a device that cooperates with monitoring the status of energy storage batteries and forms a battery pack together with the battery cells.
Its main functions are as follows:
BMS measures the basic parameters of the battery, including voltage, current, temperature, etc., to prevent overcharging and overdischarging of the battery and extend its service life.
Analyze the state of charge (SOC) and state of health (SOH) of the battery, and promptly report any abnormal information
BMS is mainly divided into two types: low voltage and high voltage
Low voltage BMS, suitable for low-voltage battery packs, with battery packs connected in parallel. BMS is a single level architecture;
High voltage BMS is suitable for high-voltage battery packs. The capacity relationship between battery packs is in series, and BMS is a two-level architecture, divided into two parts: slave control and master control;
Composition of battery system
The battery system is divided into two types: low-voltage system and high-voltage system:
Low voltage battery system: Residential low-voltage energy storage system refers to an energy storage system with a battery voltage range of 40-60V, which is connected in parallel to an inverter by several batteries;
High voltage battery system: The Residential high-voltage energy storage system battery cluster adopts a two-level architecture, consisting of several battery modules connected in series through a high-voltage control box for output. The voltage range is generally 85-800V, and the battery cluster output is connected to the inverter;
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The installation and commissioning of this equipment shall be carried out by professional electrical maintenance personne
