Single battery, power battery pack and vehicle

Abstract

The invention discloses a single battery, a power battery pack and a vehicle. The single battery comprises a shell and a pole core positioned in the shell; the shell is provided with a plurality of surfaces; at least two electrode terminals which are electrically connected with the pole core, extend out of the shell and are used for leading out currents are arranged on the at least two surfaces; at least two electrode terminals are arranged on each surface; tabs and pole pieces are arranged on the pole core; the electrode terminals are electrically connected with the pole pieces through the tabs; and H1 / H2 is greater than or equal to 35% and less than or equal to 45%, wherein H1 is the width of each tab, and H2 is the width of each pole piece. According to the single battery disclosed by an embodiment of the invention, when the multiple pairs of positive and negative electrode terminals are connected, a current conduction path can be shortened, the over-current is increased, and the impedance is reduced; the structural design of the single battery is more accordant with the standardization requirements; and the universality is better.

Description

Technical field [0001] The present application relates to the technical field of vehicle manufacturing, in particular to a single battery, a power battery pack having the single battery, and a vehicle having the power battery pack. Background technique [0002] In recent years, with the vigorous development of new energy vehicles, the performance requirements of on-board batteries have also increased. Among them, the Ministry of Industry and Information Technology, the National Development and Reform Commission, and the Ministry of Science and Technology jointly issued the "Medium and Long-term Development Plan for the Automobile Industry" to clarify the goal of China's power battery. By 2020, the specific energy of lithium-ion power batteries will exceed 300Wh / kg; The energy is striving to reach 260Wh / kg; the cost is less than 1 yuan / Wh; the operating environment is from minus 30°C to 55°C; with 3C charging capability, and strive to achieve 350Wh / kg of single battery by 2025. [...

AI Technical Summary

Problems solved by technology

However, if the size of the battery is too large, the current will be transmitted to the tab side through the current collector and then drawn out through the tab, which will make the current collection path inside the battery pole piece near the end side too long, and the internal resistance will increase, thus affecting the high current of the power battery. Charge and discharge performance, safety performance, etc.

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