Lithium ion battery PACK technology is an important skill in the energy storage industry. Let's follow the editor to learn some basic knowledge of battery PACK. 01 Definition: Lithium ion battery pack, also known as battery module, is a manufacturing process for lithium-ion batteries, which means packaging, packaging, and assembly. It refers to the connection of multiple lithium-ion single cell groups in series, taking into account system mechanical strength, thermal management, BMS matching, and other issues. Official account - new energy battery pack technology - its important technology is reflected in the overall structure design, welding and processing process control, protection level, active thermal management system, etc. If two batteries are connected in series or parallel to form a specific shape according to customer requirements, it is called a PACK. The composition of the 02 battery pack includes several important parts, including individual battery modules, electrical systems, thermal management systems, cabinets, and BMS.
YTP280024A battery module? Battery module: If battery PACK is compared to a human body, then the module is the "heart" responsible for storing and releasing electrical energy.
Lithium titanate battery module? Electrical system: mainly composed of connecting copper strips, high-voltage wiring harnesses, low-voltage wiring harnesses, and electrical assurance devices. High voltage wiring harnesses can be seen as the "arteries" of battery packs, continuously delivering battery energy to the end load, while low voltage wiring harnesses can be seen as the "neural network" of battery packs, transmitting detection and control signals in real-time.
Energy storage high-voltage wiring harness? Thermal management system: There are mainly two types of thermal management systems: air cooling and liquid cooling, while liquid cooling can be divided into cold plate liquid cooling and immersion liquid cooling. The thermal management system is equivalent to installing an air conditioner on the battery pack.
There are various assembly types of air-cooled systems, with core components mainly including compressors, fans, heat exchangers, etc
Chint liquid cooled battery cluster
The energy storage liquid cooling temperature control system indicates that the battery will generate heat in discharge mode. To ensure that the battery operates at a reasonable ambient temperature and improve its cycle life, the system temperature difference is generally required to be ≤ 5 ℃.? Box body: mainly composed of a box body, a box cover plate, a metal bracket, a panel, and fixing screws, it can be regarded as the "skeleton" of a battery pack, playing a role in supporting, resisting mechanical impact, mechanical vibration, and environmental protection.
Battery pack box body? BMS: Battery management system can be seen as the "brain" of batteries. Mainly responsible for measuring parameters such as voltage, current, and temperature of batteries, as well as balancing functions. Official account - new energy battery pack technology - can transmit data to MES.
BYD 300A BMS control box
What are the characteristics of the Juwei BMS03 battery pack? PACK lithium battery packs require batteries to have a high degree of consistency (capacity, internal resistance, voltage, discharge curve, lifespan).? The cycle life of a battery pack pack is lower than that of a single battery.? Under limited conditions (including charging and discharging current, charging method, temperature, etc.)? What is the voltage and capacity of the lithium battery pack after it is packaged? There is a significant improvement and it must be protected by charging balance, temperature, voltage, and overcurrent monitoring.? The battery pack must meet the voltage and capacity requirements required by the design. What is the method for 04PACK? Series parallel composition: The battery module is composed of individual cells connected in parallel. Parallel connection increases capacity, voltage remains unchanged, and after series connection, voltage doubles while capacity remains unchanged. Official account - new energy battery pack technology, for example: 15 cells with a voltage of 3.2V are connected in series, which is 48V, and this is the series boost. For example, if a battery cell with a capacity of 50Ah is connected in parallel, it will have 100Ah, which is called parallel expansion.? Cell requirements: Select corresponding cells according to your own design requirements. The types and models of batteries in parallel and series should be consistent, and the differences in capacity, internal resistance, and voltage values should not exceed 2%. Both flexible packaging batteries and cylindrical batteries require multiple string combinations
PACK process: The battery PACK is achieved through two methods, one is through laser welding, ultrasonic welding, or pulse welding, which is a commonly used welding method. The advantage is good reliability, but it is not easy to replace.
Energy storage battery laser welding equipment
Pulse laser 2 is achieved through contact with elastic metal sheets, which has the advantages of no welding and easy battery replacement. The disadvantage is that it may lead to poor contact. Taking into account production yield, efficiency, and internal resistance of connection points, laser welding is currently the preferred choice for many battery manufacturers. 05 How to understand the technical parameters of battery PACK
entry name | parameter indicators |
composition | 1P24S |
rated capacity | 280Ah |
rated voltage | 76.8V |
rated energy | 21.504kWh |
maximum magnification | 0.5CP |
weight | 138±3kg |
Combination method: 1P24S Editor's interpretation: S represents series cells, P represents parallel cells, and 1P24S represents 24 series and 1 parallel. After series connection, the voltage doubles, and the rated voltage is 3.2 * 24=76.8V.? Rated capacity: 280Ah. Editor's interpretation: The rated capacity of a battery refers to the capacity of the battery to operate continuously for a long time under rated working conditions. The rated capacity C of a battery, in ampere hours (Ah), is the product of the discharge current in amperes (A) and the discharge time in hours (h). So 280Ah means discharging at a maximum rate of 0.5C, which can last for 2 hours.? Rated energy: 21.504kWh Editor's interpretation: Rated energy (Wh)=nominal capacity (Ah) * nominal voltage (V), so the total energy that a battery can release is related to both capacity and voltage.