Low capacity nickel-hydrogen secondary battery and assembly method

Abstract

The invention discloses a low-capacity nickel-hydrogen secondary battery and an assembly method thereof. The low-capacity nickel-hydrogen secondary battery comprises a steel case and a polar group, wherein, the polar group consists of a positive electrode, a negative electrode and a membrane, and is characterized in that: a substrate is arranged at the bottom of the steel casing; the assembly method of the low-capacity battery comprises the following steps: (1). assembling the steel casing: the steel case is well placed in a material case regularly with the mouth upwards, the substrate is arranged on the steel casing and then the substrate is pushed to the bottom of the steel case by a tool; (2). assembling the rear end: a wound polar group is put into the steel casing where the substrate is placed in the step (1), and then groove rolling, glue coating, spot welding, alkali injection, and sealing and assembly procedures are performed; (3) high-temperature laying: the assembled battery in the step (2) is laid with the head part of the battery downwards at high temperature; (4) formation: the formation is performed after high-temperature laying in the step (3) for 48 hours. The assembly method is simple and convenient, and the low-capacity nickel-hydrogen secondary battery obtained by adopting the assembly method is characterized by low cost and good battery performance.

Description

technical field [0001] The invention relates to a nickel-hydrogen secondary battery and an assembly method, in particular to a low-capacity nickel-hydrogen secondary battery and an assembly method. Background technique [0002] Ni-MH battery is an alkaline rechargeable secondary battery that has been vigorously researched and developed both at home and abroad in recent years. Nowadays, it is widely used in communication and digital products, electric tools, instruments, toy model airplanes, electric vehicles and other fields. Its forms and requirements are becoming more and more diverse, and there are many factors that affect the performance of nickel-metal hydride batteries, including the base material of the positive / negative plate of the battery, the type of hydrogen storage alloy, the particle size of the active material, and the type and quantity of additives. As well as many aspects such as electrolyte, diaphragm, and chemical formation process. [0003] At present, ...

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Problems solved by technology

[0003] At present, there are two main solutions for the assembly of low-capacity batteries: 1. Increase the height of the electrode group by increasing the area of ​​the positive and negative electrodes; 2. Use long tabs for the positive and negative electrodes of low-capacity batteries; these two methods mainly have the following shortcomings : Option 1, the price of the base foamed nickel of the positive electrode sheet and the base copper mesh of the negative electrode sheet are not low, so the cost of the low-capacity battery is too high, which causes a waste of resources, and the tightness of the assembly is also greatly affected. Limits, the volume of the pole group is also prone to deformation. Under vibration conditions, the pole group shifts up and down and loosens, which has the potential for short circuit and explosion of the battery; scheme 2, increases the ohmic internal resistance and polarization internal resistance of the battery, reduces The battery rate discharge performance, the electrode expansion during the charge and discharge process is more obvious, and the overcharge and overdischarge performance of the battery is also greatly affected

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