Increase the use time? Dongguan New Energy's latest battery module black technology decryption

As one of the top high-tech enterprises in China, Dongguan New Energy has invested a lot of money and manpower in research and development in the field of lithium-ion batteries. Its technology level and sales volume take the lead nationwide, and it has broad market prospects in consumer electronics, electric vehicles, energy storage systems and other fields.

With the popularity of electric vehicles, the service life of batteries is directly related to the safety and stability of the transportation system. However, the service life of existing batteries is often not long enough, and the capacity will drop sharply with the increase in the number of charging times. For example, during the charging and discharging process of the widely used soft-pack lithium battery, the thickness of the battery cell becomes thicker, the battery capacity decays rapidly, and the cycle life of the entire battery is shortened. To solve this problem, gaps are usually reserved between the battery cells, but this structure will cause the overall structure of the battery module to be loose, which will also shorten the service life of the battery cell.

To this end, Dongguan New Energy applied for an invention patent called "Battery Module" on September 29, 2019 (application number: 201910933711.7), and the applicant was Dongguan New Energy Technology Co., Ltd.

Figure 1 Schematic diagram of the overall structure of the battery module

The present invention innovatively proposes a battery module, the structure of which is shown in FIG1 , including a battery cell 1, a battery cell holder 3, end plates 41, 42, a fixing member 5 and a plurality of buffer members. The plurality of battery cells of the battery module are stacked in sequence, usually in the form of a flat plate structure of different shapes, for storing energy, and the battery cell holder 3 may include a frame structure to cover the periphery of the battery cell 1 to prevent exposure, the end plates 41 and 42 clamp the battery cell holder and the battery cell, and the fixing member 5 is sleeved on the end plates 41 and 42.

Figure 2 Exploded view of the battery module

FIG2 is a schematic diagram of the battery module in FIG1 , in which a plurality of battery cells 1 are stacked and arranged, and a buffer 2 is placed between the battery cells, which can be elastically deformed to absorb the expansion when the battery cell 1 expands, and the buffer recovers when the battery cell contracts. When the battery is charged, the battery cell expands, and the buffer always provides a force of 0 to 1 MPa to the battery cell, which can not only effectively provide buffering for the battery cell, but also provide appropriate pressure to the battery cell. In the process of discharge, as the battery cell 1 contracts, the buffer 2 recovers due to elasticity, and still applies a certain pressure to the battery cell, so that the battery cell continues to maintain a compacted state. In this way, the overall cycle life of the battery module is significantly extended.

Figure 3 Schematic diagram of submodule decomposition

Referring to FIG3 , the submodule 300 decomposition structure of the battery module may include multiple units A, and a battery module may include multiple submodules 300. As mentioned above, a unit A includes a battery cell 1, a buffer 2 and a battery cell holder 3. The battery cell is installed in the frame of the battery cell holder. The buffer is located on one side of the battery cell and is separated from the battery cell 1 of another adjacent unit A. The battery module constructed in this way can form a "buffer/battery cell/buffer/battery cell/buffer...battery cell/buffer" structure, which is more conducive to battery charging and discharging. In order to provide a better buffering effect, the thickness of the buffer is about 0.15 times the thickness of the battery cell, and the width is 0.95 times the width of the battery cell.

The above is the main content of Dongguan New Energy Technology's patent on lithium battery modules. Starting from the overall structure of the battery, when not charged, the battery cell is under a certain pressure. The overall structure of the battery module is compact, that is, it is in a compressed state, while the battery cell is allowed to expand to a certain extent during charging. As the discharge progresses, the battery cell continues to shrink, causing the battery cell to still be under a certain pressure, so that the entire process remains compressed, which significantly extends the overall cycle life of the battery module.

The electrification of transportation is the trend of development in today's era, which has greatly promoted the development of lithium-ion batteries. I believe that Dongguan New Energy can take advantage of this opportunity and ride the wave in the battery field.