Power lithium-ion battery with heat dissipation performance

Abstract

The invention discloses a power lithium-ion battery with heat dissipation performance, comprising a positive electrode pole piece, a negative electrode pole piece and an isolating membrane, wherein the positive electrode pole piece and the negative electrode pole piece comprise a current collector and an active material membrane coated on the current collector; the current collector is provided with a plurality of extending parts in an extending manner in the width direction; when the positive and negative electrode pole pieces and the isolation membrane coil to form battery cells, the extending parts arranged on the current collectors of the positive and negative electrodes are fixed together to respectively form positive and negative electrode tabs; the above battery cells are connected with the external circuit electrically through the positive and negative electrode tabs. In the lithium-ion battery with the above structure, the positive and negative electrode pole pieces are provided with tabs constituted by the plurality of the extending parts, thus greatly increasing the distributary capability during charge-discharge of great current of current collector tabs, and lowering internal resistance of the battery. When the battery emits heat, heat dissipation can be carried out through multiple extending parts of current collectors.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a power type lithium ion battery with heat dissipation performance. Background technique [0002] At present, many low-internal-resistance, high-power lithium-ion batteries adopt a structure in which stacked sheets or multiple wound cells are connected in parallel. The disadvantages of these structures are: the lamination structure reduces the internal resistance of the battery to a large extent, but the alignment between the positive and negative electrodes is very difficult, and the overall heat dissipation is poor; The battery structure in which multiple tabs are welded on the pole pieces and connected in parallel can only improve the internal resistance of the battery to a certain extent, but its high-power performance is still relatively poor, and the battery structure of each winding cell Consistency requirements are high, and processing efficiency is low. [0003] In view of this...

AI Technical Summary

Problems solved by technology

The disadvantages of these structures are: the lamination structure reduces the internal resistance of the battery to a large extent, but the alignment between the positive and negative electrodes is very difficult, and the overall heat dissipation is poor; The battery structure in which multiple tabs are welded on the pole piece and multiple tabs are connected in parallel can only improve the internal resistance of the battery to a certain extent, but its high power performance is still relatively poor, and the battery structure of each winding cell Consistency requirements are high, processing efficiency is low

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