Square lithium-ion power battery

Abstract

The invention discloses a square lithium-ion power battery which comprises a battery case (2). A plurality of longitudinally distributed pole groups (6) are arranged in the battery case (2), and the upper end and the lower end of each pole group (6) are respectively and fixedly provided with a positive terminal (41) and a negative terminal (42). The top of the positive terminal (41) is sheathed with a hollow insulating seal ring (3), a hollow battery cover (1) is arranged above the insulating seal ring (3), and the top of the positive terminal (41) penetrates through the insulating seal ring (3) and the battery cover (1) and protrudes out from the upper surface of the battery cover (1). The square lithium-ion power battery has simple battery structure and good current-collecting performance by adopting the current-collecting structure formed by connecting a plurality of pole groups in parallel in the battery, the overall performance of the square lithium-ion power battery is improved, the safety performance of the battery is ensured, and the market application range of products of battery manufacturers is expanded. Thus, the invention has important production practice significance.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery manufacturing, in particular to a square lithium ion power battery. Background technique [0002] At present, compared with other types of batteries such as lead-acid and nickel-cadmium, lithium-ion batteries have many advantages such as large specific capacity, high working voltage, fast charging speed, wide working temperature range, long cycle life, small size and light weight. It has been widely used in mobile phones, notebook computers, electric tools and other fields, and its application range is becoming wider and wider. [0003] With the expansion of the use of lithium-ion batteries, we are used to calling the chemical power sources used in power supply systems power batteries, such as power tools, electric vehicles and other fields, the conditions of use of power batteries are complex, and batteries are also required to have more High capacity performance and power performan...

AI Technical Summary

Problems solved by technology

In order to improve the high current performance of the battery, the end face laser welding is generally used to improve the electrochemical performance of the battery, and in order to achieve a higher capacity of the single battery, a very long pole piece winding is applied. The battery of this structure The manufacturing process is complex, the process control is relatively difficult, and failure factors that affect battery performance are prone to occur. However, the internal structure of the square battery is complex, and the internal current collection effect is poor. There is still a long way to go before the actual application.

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