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Since last year, the "module free" battery pack has suddenly caught fire. The two domestic battery giants led the trend, and Ningde Times launched the "CTP (Cell To Pack)" battery pack; BYD offers blade batteries, which are directly grouped into battery packs without modules; Honeycomb Energy, a new battery company, also disclosed the CTP battery pack. In addition, some enterprises are also developing similar technologies.

The "module free" battery pack, as the name implies, is to directly integrate the cell into the battery pack.

According to the data provided by the enterprise, the "module free" battery pack can improve the volume utilization rate and reduce the cost of the battery pack.

Taking Ningde Times as an example, its CTP battery pack volume utilization rate has increased by 15% - 20%, the number of battery pack parts has decreased by 40%, the production efficiency has increased by 50%, and the energy density of the battery pack has increased by 10% - 15%, which can reach more than 200Wh/kg.

BYD launched a "blade battery" with lithium iron phosphate, which increased the system volume by 50%. In the view of industry insiders, this is also a typical "module free" battery pack.

The external publicity data of Honeycomb Energy is that compared with the traditional 590 module, the first generation of Honeycomb CTP reduces the number of parts by 24%, the second generation group efficiency increases by 5-10%, the space utilization rate increases by 5%, and the number of parts decreases by another 22%.

From the data point of view, the benefits of canceling the module are obvious, but will it bring new problems? Does the "no module" battery pack have no module structure? What are the similarities and differences of each technology route? What is the possible impact on the industry?

1. Is there a module in "no module"?

Every family says "no module". Is it true that there is no module?

For example, according to the patent CN 209658278 U of Ningde Times, its CTP battery pack has modules. According to the summary, Ningde Times battery pack contains more than two battery modules.

Source: Ningde Times Patent CN 209658278 U

BYD's "blade battery" consists of a battery pack, which is compatible with both modular and non-modular forms. In the module free mode, the cell itself undertakes part of the module functions, which increases the capacity, but also improves the space utilization rate and reduces the material and internal consumption; In the case of module, the module structure does not include the end plate and side plate, and is also improved compared with the traditional module.

From the perspective of many patents of BYD's "blade battery", first of all, the length of the battery cell is much longer than that of the general, and it is shaped like a blade. In BYD patent CN 110518174 A, the length is 400~2500mm.

Source: BYD patent CN 110518174 A Note: 100 is the cell, namely "blade battery"

Secondly, the "blade battery" has multiple poles in series. Compared with the cell composition module, it also improves the voltage and capacity, but reduces the shell and external installation structure, improves the space utilization rate, and ensures the overall capacity of the power battery pack; At the same time, it also reduces the use of external power connectors and reduces internal consumption.

Source: BYD Patent CN 110518174 A

Third, based on the "blade battery", it can be made into a non-module battery pack or a module battery pack. According to our analysis, the non-module battery pack is mainly used in passenger cars, and the module battery pack is mainly used in commercial vehicles.

Source: BYD patent CN110518156 A

Fourth, even for battery packs with modules, based on "blade battery", this module can save some structural parts compared with conventional modules, and also achieve the function of improving the volume energy density.

Source: BYD Patent CN 209389112 U

Honeycomb Energy's CTP battery pack patent CN 109728219 A describes a battery module. Honeycomb Energy makes the structure of the battery pack more compact by integrating the reinforcing beam and the end plate, and improves the strength and reduces the weight of the battery pack.

Source: Honeycomb Energy Patent CN 109728219 A

How are their modules different from traditional modules?

Generally speaking, the basic components of the battery module include: module control, battery monomer, conductive connector, plastic frame, cold plate, cooling pipe, pressing plate at both ends, and a set of fasteners that combine these components. In addition to the function of assembling the single cell and providing a certain pressure, the pressing plates at both ends sometimes also design the fixed structure of the module and the battery pack.

The battery packs of the above-mentioned enterprises only reduce the components of the battery module, such as the end plate and side plate, and make the battery module larger.

In the view of Mr. Zhang, the general manager of a battery system manufacturing enterprise, most of these "moduleless" battery packs are simple modules or large modules. The ultimate goal is to reduce the waste of battery pack space and reduce some redundant weight, so as to improve the energy density of the battery system.

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