Lithium ion power battery with bidirectional current collectors

Abstract

The invention discloses a lithium ion power battery with bidirectional current collectors, which comprises a battery case (1). A battery core electrode group (100) is arranged in the battery case (1). An anode current collector (31) and a cathode current collector (32) are fixedly arranged at the upper and lower ends of the battery core electrode group (100) respectively. Cylindrical terminal posts (300) are arranged at the left and right ends of each of the anode current collector (31) and the cathode current collector (32) respectively. Battery covers (2) are arranged on the outer surfaces of the anode current collector (31) and the cathode current collector (32). The lithium ion power battery with the bidirectional current collectors adopts bidirectionally led-out external current collector structures, realizes a shortest current path and uniform current density, has increased energy density, improved rate discharge performance and relatively better current collection effect, and can be widely applied in the field of traffic and transportation.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery manufacturing, in particular to a lithium ion power battery with a bidirectional current collector. 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...

AI Technical Summary

Problems solved by technology

In order to improve the high-current performance of the battery, the end-face laser welding of the circular lithium-ion power battery 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 manufacturing process of this structure is complex, the process control is relatively difficult, and failure factors affecting battery performance are prone to occur; while the square lithium-ion power battery has a complex internal structure and poor internal current collection effect, which is still far away from practical applications. long way

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