What to buy? cells? Battery modules? or Packs?

Cells, batteries modules and battery pack are different forms of batteries at different application stages. Multiple cells packaged together to form a module. With a BMS installed, multiple modules can form a pack.

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Cells, modules or packs, the choice shall be made upon the end users' specific applications.

Let's take an example as reference, the battery modules can support, fix and protect the cells. And the modular design is convenient for transportation. 

In some situations, battery modules can be more cost-effective, such as forklift power systems. Due to long-time transportation and higher cost caused by "extra weight" (to maintain the lifting weight and balance of forklifts since lithium batteries are far lighter than lead-acid batteries), some industrial battery wholesalers or end users would like to choose the modules instead of all-in-one packs. 

Jetspower as a one-stop supplier, manufactures cells, modules, packs and provides customers with terrific technical solutions. Its VDA355, VDA590, and custom prismatic modules, greatly fill in the gaps of this area.

Normally, if you want to get a custom battery module solution, you might have to offer the data in the list as below:

     Voltage

                            ?

     Current

                            ?

Contact us to discuss your requirements of vda battery. Our experienced sales team can help you identify the options that best suit your needs.

     Parallel or seires?

                            ?

And if you have no idea about the module design, it's okay to just give your pack design, technicians will work out a best solution in accordance with your pack design.

With the formulation of relevant standards and specifications for power lithium-ion battery systems and promoting the development of technology, the market has higher and higher requirements for the specific energy of power lithium-ion battery systems, and the application of lightweight in power lithium-ion battery systems is also imminent. In the lightweight design of the battery pack, there are two directions: one is the system level; the other is the detailed design level.

The lightweight design of PACK, whether it is chatting with friends or similar articles, is concentrated in a certain area, either the application of new materials or the new way of grouping. The power lithium-ion battery PACK is a highly integrated, refined, and high-safety vehicle energy storage system. We should also systematically and comprehensively analyze a technical problem.

Before analyzing, let me tell two stories:

Story 1: The specific energy of a certain family's battery is only about 138Wh/kg, and the specific energy of PACK can be more than 116Wh/kg, why now the batteries are more than 150Wh/kg, you can only achieve more than 100Wh/kg A little bit?

Story 2: A domestic car and a joint venture car are doing benchmarking analysis. The parameters and performance of each part are listed. It is found that each part is better than the joint venture car, but the performance of the whole vehicle is worse than that of the joint venture car of the same level. &#;

From the above two stories, we can find that the single highlight of the product does not represent the overall performance of the product; the lightweight of PACK is also the same, we want the entire product to be lightweight, not a certain point.

Following the rhythm at the beginning of the article, the lightweight of PACK has two directions: system level and detailed design level.

Let's analyze it from the lightweight design at the system level. The lightweight design at the system level is a directional design. Only when the front direction is right, the back will not go back; in this, the selection of the battery cell is a very important aspect. Cells of different systems and sizes , And the power lithium-ion battery system has a matching problem.

The first is the matching of system parameters: one more point is too much, one less point is not enough. Under the premise of satisfying the function, no manufacturer will be willing to spend more money; assuming that the customer wants 138.2KWh, this power can just meet a certain bus 250KM The design mileage is not up to the standard (when it is close to the energy); and if you configure more than 150Kwh for your customers, some of the customers are unwilling to spend more money.

The second is the matching of the overall arrangement, which can be understood as a combination of parts to be straightforward. Take the recommended size of the standard box (*630*215~245mm) as an example. The design of the standard box is based on the VDA size cell. The matching degree between the VDA size cell and the standard box should be considered optimal. The specific energy of the cell is about 138Wh/kg, and the specific energy of the PACK can be more than 115Wh/kg, and the group efficiency is close to 85%.

Using non-VDA size batteries to design a standard box, even if the specific energy of the battery may reach 145Wh/kg, but the matching degree of the battery and the standard box is poor, the specific energy of the PACK is more than 115Wh/kg. Very difficult. For example: the projection area of a battery cell is the same as the VDA size, but the height dimension is very different. The height advantage of the standard box cannot be used. Even if the specific energy of the battery cell is close to 150Wh/kg, the specific energy of the PACK is 115Wh/kg. It takes a lot of energy to achieve.

If you want to learn more, please visit our website group battery.