What is the new energy battery CTP technology?

Column:Industry News Time:2020-07-13
Recently, new energy battery CTP technology appears more and more frequently in the media.

Recently, new energy battery CTP technology appears more and more frequently in the media, mainly introducing new energy vehicle power technology, but for those who do not understand new energy batteries, what exactly is battery CTP technology?

There are two main technical routes for new energy battery CTP technology: CTP is the English abbreviation of Cell to PACK, which is the direct integration of batteries into battery packs, thus eliminating the need for intermediate modules. At present, CTP has two technical routes. One is to use a completely module-free method, and the other is to replace a small module with a large module.

The battery packs mounted on general electric vehicles are assembled from cells (Cells) into modules (Module), and then the modules are installed in the battery packs (Pack) to form a three-level "cell-module-battery pack" Assembly mode.

The more popular blade battery technology recently launched by BYD is the representative of a completely module-free technical solution. It consists of large batteries with a length of more than 0.6 meters, arranged together in an array, and inserted into the battery like a "blade". Inside the bag. Therefore, it is also called a "blade battery", so that the volume of the battery increases by 50%, the cost is reduced by 30%, and the cruising range reaches 600km, the battery will adopt the CTP method.

Another way to realize the new energy battery CTP technology is to replace the previous small module with a large module, instead of completely removing the module, but removing the side panel of the previous small module and connecting it with a cable tie to connect the module To be bigger, representative companies include Tesla, CATL, Honeycomb Energy, etc. The main highlight is the use of a sleeve connection between the module and the module to close together, and at the same time, there is a fixing device under the sleeve to connect with the whole vehicle, so that the entire module simplifies the structure and also achieves light weight.

From the above analysis, it can be seen that the new energy battery CTP technology is not a very advanced technology. It is nothing more than the use of large batteries and large modules, which mainly optimize the internal connection of the battery pack, eliminating the need for intermediate processes. Components, thereby simplifying the assembly process and flow.

Advantages and disadvantages of new energy battery CTP technology

The new energy battery CTP technology can save or reduce the end plate, side plate and the screws used to fix the module of the assembled module and other fasteners, which can improve the volume utilization rate. Due to the reduction of parts and components, the weight is reduced, so the mass energy density can also be improved, and the cruising range of the vehicle can also be improved.

As the battery assembly process is simpler, manpower, material resources, and other manufacturing costs are saved, and the cost of parts and components is reduced, the cost of the battery pack will also be reduced.

However, new energy battery CTP technology cancels the module link, which will also bring many risks.

The new energy battery CTP technology has higher requirements for the consistency of the cell. The deformation of the cell due to charging and discharging expansion and the deterioration of the heat dissipation performance need to be considered at the level of the entire battery pack.

The module is cancelled, and the protection at the module level from thermal runaway of the battery cell is also cancelled; at the same time, the corresponding BMS sampling and control strategy also needs to be changed.

In addition, the new energy battery CTP technology, once a single battery cell fails, it will involve the replacement of the entire battery pack instead of just replacing a certain module before, and the maintenance cost will increase significantly.