Over view Battery Pack Charger	Module Design and Assembly In initial designing stage, while considering the shape of a battery module, please make sure the battery module inserted space and method in the equipment. Also, please take it into consideration the heat dissipation approaches during fast charging, Basic shapes of battery modules are shown in Fig. 18. Basic shapes of battery modules   Model A Model 2A Model B Model 2B Appearance Series A: cells are assembled into close vertical rows from one to five, connected by spot welding nickel sheets and then packaged with a shrinkage tube. Series B: cells are assembled into close parallel rows form one to five, connected by spot welding the nickel sheets and then packaged with a shrinkage tube. Protective Components and Devises In designing of battery modules, please fully understand and consider possible abnormality of the charger and possible external short circuit of the battery module, before selecting the protective components. Protective components recommended by YUASA Company are shown in Fig.19. It is also necessary to consider the discharge condition and ambient temperature when selecting the protective components. 1. Temperature switch 2. PTC (Positive temperature coefficient heat-sensitive resistance) 3. NTC (Negative temperature coefficient heat-sensitive resistance) Protective components of battery modules Short circuit, Over-current protection Temperature examination Remark Both temperature protector and fuse are used Heat sensitive resistance: Cut off charge and discharge beyond recommended temperature Select protective components and devices, according to the charge and discharge conditions. You may increase and reduce protective devices at different conditions. Both temperature protector and PTC are used ※ Temperature protector and PTC (Positive Temperature Coefficient) have recovering function and fuse is non-recovered. Additional Description on Module Assembly (1)Each cell within a battery module is connected with another by spot welding. The reason of selecting nickel sheet is the low resistance of nickel, without increasing much total resistance. In spot welding process, be care not to break the nickel sheet with over-current, or unstable welding site caused by too low current. If the thickness is more than 2mm, the nickel sheet should be processed into special shape, insuring the quality of spot welding. (2) In designing outside containers of battery modules, heat and gas releasing holes should be arranged, because heat and gas may be generated during batteries operation. If the temperature is too high, the cycle life and other performances of batteries shall be affected greatly. << Back
	about us | product | core competence | news | inquiry | contact us All rights are reserved by YUASA (Tianjin) Technology Ltd. 2004