1.2V NiMH battery

Teaching 1.2V NiMH battery PACK assembly knowledge and technology

Lithium-ion 1.2V NiMH battery manufacturers teach lithium-ion 1.2V NiMH battery PACK assembly knowledge and technology. Under the background of the new national standard, the demand for lithium-ion batteries is increasing, and many lead-acid 1.2V NiMH battery companies have also launched lithium 1.2V NiMH battery products. The process of assembling lithium-ion 1.2V NiMH battery cells into groups is called PACK, which can be a single 1.2V NiMH battery or a series-parallel 1.2V NiMH battery module. The following lithium-ion 1.2V NiMH battery manufacturer will introduce the lithium-ion 1.2V NiMH battery PACK assembly knowledge and technology in detail.

PACK composition

PACK includes 1.2V NiMH battery packs, busbars, soft connections, protection boards, outer packaging, outputs (including connectors), barley paper, plastic brackets and other auxiliary materials. These items together constitute PACK.

PACK characteristics

① Lithium-ion 1.2V NiMH battery pack PACK requires batteries to have a high degree of consistency.

Lithium-ion 1.2V NiMH battery PACK is achieved in two ways. One is through laser welding or ultrasonic welding or pulse welding. This is a commonly used welding method. The advantage is good reliability, but it is not easy to replace. The second is through elastic metal sheet contact. The advantage is that no welding is required and the 1.2V NiMH battery is easy to replace. The disadvantage is that it may cause poor contact.

Lithium-ion 1.2V NiMH battery PACK assembly method

① Series-parallel composition: The 1.2V NiMH battery is composed of single cells connected in parallel and in series. Parallel connection increases capacity and the voltage remains unchanged. After series connection, the voltage doubles and the capacity remains unchanged. For example, a 3.6V/10Ah 1.2V NiMH battery is composed of a single N18650/2Ah connected in parallel 5 times. Parallel first and then series: The difference in internal resistance and uneven heat dissipation in parallel will affect the 1.2V NiMH battery cycle life after parallel connection. However, a single 1.2V NiMH battery fails and automatically exits. Except for the reduction in capacity, it does not affect the use after parallel connection. The parallel connection process is stricter. When a unit 1.2V NiMH battery in parallel is short-circuited, the current in the parallel circuit is very large, and fuse protection technology is usually added to prevent it. Series first and then parallel: According to the capacity of the entire 1.2V NiMH battery group, series connection is first carried out, such as 1/3 of the entire capacity, and then parallel connection is carried out, which reduces the probability of failure of large-capacity 1.2V NiMH battery packs.

② 1.2V NiMH battery cell requirements: Select the corresponding 1.2V NiMH battery cell according to your own design requirements. The batteries in parallel and series connection are required to be of the same type and model, and the difference in capacity, internal resistance and voltage value is not more than 2%. Generally speaking, after the 1.2V NiMH battery is connected in parallel and in series, the capacity loss is 2%-5%. The more batteries there are, the more capacity loss there is. Whether it is a soft-pack 1.2V NiMH battery or a cylindrical 1.2V NiMH battery, multiple strings must be combined. If the consistency is poor, it will affect the 1.2V NiMH battery capacity. The 1.2V NiMH battery with the lowest capacity in a group determines the capacity of the entire group of batteries. High current discharge performance is required. The starting current of the motor is 3 times the normal working current. Only by high current discharge can the motor power performance be improved. The 1.2V NiMH battery heat dissipation is required to be good. There are a large number of batteries, and the temperature rise of the batteries inside the 1.2V NiMH battery box is not easy to dissipate, resulting in uneven temperature between the batteries, different discharge characteristics, and long-term 1.2V NiMH battery performance degradation. The production process level is high. The 1.2V NiMH battery must be able to withstand the vibration impact of bumpy roads. High requirements are placed on the production process, especially the spot welding process. Test after welding to prevent false welding and desoldering.

The above is the basic knowledge of lithium-ion 1.2V NiMH battery packs PACK. In fact, there is still a lot for you to learn about 1.2V NiMH battery PACK. The demand for lithium-ion batteries is increasing, and many lead-acid 1.2V NiMH battery companies have also launched lithium 1.2V NiMH battery products. If lithium-ion 1.2V NiMH battery PACK companies want to develop, they must rely on more professional technology and better cost control capabilities than 1.2V NiMH battery manufacturers and vehicle manufacturers, as well as more professional automation equipment to achieve stable cooperation with vehicle manufacturers.

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