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Cylindrical lithium ion battery pack and combination method thereof

A lithium-ion battery pack and combination method technology, applied in battery pack components, cell structure combination, secondary battery repair/maintenance, etc., can solve problems such as restricting battery pack development and market application, and achieve non-destructive recycling , Reliable and effective connection, Eliminate the effect of spot welding process

Inactive Publication Date: 2014-04-30
TIANJIN XIANZHONG SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These problems have become common problems in the industry, restricting the development and market application of battery packs

Method used

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  • Cylindrical lithium ion battery pack and combination method thereof
  • Cylindrical lithium ion battery pack and combination method thereof
  • Cylindrical lithium ion battery pack and combination method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] A cylindrical lithium-ion battery pack, comprising a steel shell battery 1 , a connecting metal strip 2 , a powerful magnet 3 , and an overcharge prevention diode 4 . The connecting metal strip 2 is a nickel strip or a nickel-plated steel strip, and the powerful magnet 3 is a rare earth permanent magnet. The anti-overcharge diode 4 is an avalanche diode with conduction characteristics higher than the threshold voltage. The connecting metal strip 2 is connected between the electrodes of the steel shell battery 1 by a powerful magnet 3, and the anti-overcharge diode 4 is welded on the connecting metal strip 2. The steel shell battery 1 is a combined connection structure for increasing the capacity in parallel and increasing the voltage of the battery pack in series.

Embodiment 2

[0034] A 36V10Ah battery pack structure and its combination method.

[0035] In this embodiment, 18650 batteries with ternary cathode materials are selected for combination. The capacity of the single battery is 2000mAh. In order to achieve the specification of 36V10Ah, a structure of 5 and 10 strings is required. The operation procedure is as follows: First, connect five 18650 batteries in parallel to form a 10Ah single battery pack, place nickel strips on both sides, and press them tightly with magnets. The anti-overcharge diode 4 is welded, and then 10 groups of single battery packs are connected in series to obtain the 36V10Ah battery pack of the present invention. The assembled outline drawing is attached image 3 shown.

Embodiment 3

[0037] A 48V20Ah battery pack structure and its combination method.

[0038] In this embodiment, a 26650 battery made of lithium iron phosphate cathode material is selected for combination. The capacity of the single battery is 3200mAh. In order to achieve the specification of 48V20Ah, a structure of 7 and 16 strings is required. The operation procedure is as follows: First, connect seven 26650 batteries in parallel to form a 20Ah single battery pack, place nickel-plated steel strips on both sides, and press them tightly with magnets. The anti-overcharge diode 4, and then 16 groups of single battery packs are connected in series to obtain the 48V20Ah battery pack of the present invention.

[0039] This embodiment has the advantages of simple structure, high reliability, good stability, safety and effectiveness, and overcharging prevention; the combination method has the advantages of completely eliminating the spot welding process, realizing reliable and effective connection...

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Abstract

The invention relates to a cylindrical lithium ion battery pack and a combination method thereof, belonging to the technical field of lithium ion batteries. The cylindrical lithium ion battery pack comprises steel shell batteries (1), connection metal belts (2), strong magnets (3) and overcharge-resistant diodes (4), wherein the connection metal belts (2) are connected between electrodes of the steel shell battery (1) by the strong magnets (3), and the overcharge-resistant diodes (4) are welded on the connection metal belts (2). The combination method of the cylindrical lithium ion battery pack comprises the following steps: (1) a single battery pack is formed by parallel connection, i.e. single cylindrical lithium ion batteries are connected in parallel to form a single battery pack, the single battery pack is pressed using the strong magnet after the connection metal belts are arranged at two edges, and the overcharge-resistant diodes are welded on the connection metal belts; (2) a battery pack is formed by the series connection of the single battery packs, i.e. the single battery packs are connected in series to form the cylindrical lithium ion battery pack. The cylindrical lithium ion battery pack and the combination method thereof have the advantages of simple structure, safety, reliability, good stability, overcharge prevention and the like, and the electrode terminals of the steel shell battery are in reliable and effective connection.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, in particular to a cylindrical lithium-ion battery pack and an assembly method thereof. Background technique [0002] At present, lithium-ion batteries have relatively high specific energy and specific power, and are the preferred new energy technology for power batteries in the 21st century. In order to achieve large-capacity, high-voltage battery pack specifications, generally batteries need to be combined in parallel and in series, and the battery management system is used to manage the batteries to prevent overcharging and over-discharging of single batteries. [0003] Cylindrical steel-case batteries have greater rigidity, pressure resistance, and deformation resistance, and their mechanical strength is significantly better than aluminum-case batteries, plastic-case batteries, and soft-pack batteries. In addition, steel shell batteries are easy to realize fully automated produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/20H01M50/516
CPCH01M10/425H01M50/502Y02E60/10
Inventor 梁广川
Owner TIANJIN XIANZHONG SCI & TECH
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