Lithium ion battery module and battery pack

Abstract

The invention provides a lithium ion battery module and a battery pack. The lithium ion battery module comprises a plurality of battery module units which are connected in series, wherein each moduleunit comprises a plurality of single batteries and a current collection bar, the single batteries are connected in parallel by the current collection bar, the current collection bar comprises positivewelding sheets, an elastic sheet structure and a support structure, the positive welding sheets are welded with positive electrodes of the single batteries, negative electrodes of the single batteries are crimped by the elastic sheet structure, and the support structure is used for positioning and supporting the single batteries. In the lithium ion battery module and the battery pack, provided bythe invention, the multi-functional current collection bar is employed, the lithium ion battery module is light in mass, and the mass energy density of the battery module is improved; each single battery is rapidly integrated by an elastic sheet crimping mode, the assembly efficiency is improved, and the disassembly and the recycling of the lithium ion battery are convenient; and a weak connection structure of a welding sink position of the positive electrode of the current collection bar has an effect of fuse protection when the single batteries are circuit-shorted, and the safety of the battery module and the battery pack are improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery assembly, in particular to a lithium-ion battery module and a battery pack. Background technique [0002] In recent years, with environmental pollution and the danger of fossil energy, the public and government departments have been continuously promoting new energy, especially the application of new energy lithium-ion batteries, which has attracted much attention. All countries have introduced a large number of relevant policies for new energy power lithium-ion batteries. [0003] Lithium-ion battery is a secondary battery (rechargeable battery) that mainly relies on the movement of lithium ions between the positive and negative electrodes to work. During the charging and discharging process, Li+ intercalates and deintercalates back and forth between the two electrodes: when charging, Li+ is deintercalated from the positive electrode, intercalated into the negative electrode through ...

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Problems solved by technology

[0004] Since 2016, China's new energy market's policy orientation for new energy, especially the national standard policy for power lithium-ion batteries used in the field of new energy vehicles has been introduced in full swing. The relevant policy orientation is obvious, and all orientations point to: 1. Energy density must be Continuous improvement; 2. The battery must have the ability to recycle and cascade utilization; 3. Ensure the safety of the battery application process; The above three points are not considered enough

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