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What is a battery pack? Power battery pack technology. Battery PACK generally refers to combination batteries. The battery pack can be achieved through two methods: laser welding, ultrasonic welding, or pulse welding. This is a commonly used welding method, which has the advantage of good reliability but is not easy to replace. The second is through contact with elastic metal sheets. With the increasing trend of division of labor in production, the power battery PACK industry is gradually starting and achieving rapid development.

What is a battery pack?

A battery pack generally refers to packaging, packaging, and assembly. For example, if two batteries are connected in series and form a specific shape according to customer requirements, we call it a pack. In the Pack industry, batteries that are not assembled for direct use are often referred to as battery cells, while finished batteries that are connected to PCM boards and have functions such as charge and discharge control are called batteries.

The PACK assembly process is a crucial step in the production of power battery packs, and its importance has become increasingly evident with the continuous expansion of the electric vehicle market. At present, power batteries for automobiles are mainly composed of the following systems: battery modules, battery management systems, thermal management systems, electrical and mechanical systems.

Battery PACK is currently mainly concentrated in lithium battery PACK factories, which have their own PACK structure design, PACK electronic design, and PACK production workshops. They can independently develop and design according to customer needs. After confirming the customer's customized requirements for PACK lithium batteries through battery solutions, battery specifications, and battery samples, they can be produced and processed by the PACK production line in the PACK workshop. After quality inspection is qualified, they can be shipped.

Introduction to Power Battery Pack Process

1. Assembly process

The assembly process of PACK is actually somewhat similar to the engine assembly process of traditional fuel vehicles. Connect the five major systems together through connectors such as bolts, nuts, ties, clamps, and wire harness nails to form an assembly.

2. Airtightness testing process

Power battery packs are generally installed under the seats or trunk of new energy vehicles, and are in direct contact with the outside world. Once high-voltage electricity comes into contact with water, you can imagine the consequences with common sense. Therefore, when new energy vehicles are involved in water, it is necessary for the battery pack to have good sealing.

3. Software flashing process

The component brushing process is to brush the BMS control strategy into the CMU and BMU of the BMS in the form of code, in order to collect battery status information data during battery testing and use, which is processed and analyzed by the electronic control unit. Then, based on the analysis results, control instructions are issued to the relevant functional modules in the system, and the information is ultimately transmitted to the outside world.

4. Electrical performance testing process

The electrical performance testing process is a testing process that must be carried out after the completion of the above three processes, i.e. before the product is taken offline. Including insulation testing, charging status testing, fast and slow charging tests, etc.

Development prospects of battery pack

The global power battery pack market is mainly monopolized by Japan, South Korea, and China, with their power battery production capacity accounting for over 95% of the world. According to the targets of cell energy density of 300Wh/kg and Pack energy density of 260Wh/kg, the integration efficiency of the Pack system needs to reach 85%, while the integration efficiency of current passenger car packs is generally around 65%. This means that the integration efficiency needs to be significantly improved to achieve the goal.

There are two feasible ways to improve the integration efficiency of a pack. Firstly, optimize the internal structural design of the pack, significantly reduce the number of components inside the pack, integrate more components and functions on the module and box, and thus reduce weight; Another approach is to use lightweight materials, such as using aluminum profiles or composite materials instead of high-strength steel, and using plastic parts instead of metal parts, which can also reduce weight.

As the main battery used in new energy vehicles, power batteries will usher in a golden development opportunity period driven by policies. The power battery pack industry will also have more development opportunities under the favorable situation of power batteries. Moreover, with the continuous updates and breakthroughs in technology, and the continuous innovation and exploration of business models, the power battery pack industry will also experience faster growth driven by new technologies and models.

Power battery PACK is relatively a technology intensive industry. In the next five years, the growth rate of the power battery PACK industry will remain at around 30%. By 2023, the global market size of power battery PACK will reach $186.3 billion.

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