Built-in battery pack for mobile communication terminal and method of manufacturing the same

Abstract

The invention relates to a built-in battery pack for mobile communication terminal and a method of manufacturing the same; for the anode / cathode terminal of the battery pack, the invention does not soldering but uses precise spot welding mode to weld the anode / cathode nickel sheets of PCM and one side connecting portion of PTC, which simplifies the product structure and operating procedures and reduces the badness caused by soldering. The battery pack comprises a battery unit formed with an anode terminal and a cathode terminal at the upper side for charging and discharging; PTC, when mounting, one side connecting portion of bimetal function located at the upper part of the cathode terminal of the battery pack; PCM, the anode and cathode nickel sheets provided at the lower side by surface assemble in raised manner and spot welded one the other side connecting portion of the PTC and the anode terminal of the battery pack formed with corresponding spot welding holes on the upper side; a top cover combined in the upper side of the battery pack and penetrated with corresponding external connecting hole for exposing the external connecting terminal formed on the upper side of the PCM; a bottom cover combined in the lower side of the battery unit; a packing label for packing the battery pack.

Description

technical field [0001] The present invention relates to a built-in battery pack for mobile communication terminals in which battery unit constituent parts are welded together only by spot welding, and more particularly relates to a battery pack that does not use Soldering and only using spot welding can easily and easily weld the anode / cathode nickel sheet combined with PCM (overcharge protection circuit module) and one side connection part of PTC (overcurrent protection element), thus greatly simplifying the product structure and operation A built-in battery pack for mobile communication terminals and a manufacturing method thereof, which structurally reduce the defective rate of products caused by soldering. Background technique [0002] Recently, with the popularization of mobile communication terminals, various battery products have appeared. Compared with external battery packs, built-in battery packs are more popular. With the gradual miniaturization and thinning of m...

AI Technical Summary

Problems solved by technology

[0004] In particular, for PCM950, the cathode nickel sheet 941 and the anode nickel sheet 942 that are electrically connected to the cathode terminal 901 of the battery cell 900 and one side connection portion of the PTC 920 respectively are soldered and combined by independent soldering. Due to the characteristics of soldering, it is difficult to perform accurate soldering operations, and the unheated circuit may be defective due to soldering heat.

[0005] That is, in this battery pack product manufacturing method, the anode nickel sheet and the cathode nickel sheet as the anode and cathode terminals are welded on the PCM (protection circuit module) by manual soldering, so the work efficiency is low, not strong enough, and lacks Component assembly space required for surface mount technology (SMT: SurfaceMount Technology)

[0006] In addition, in addition to the welding of the anode and cathode nickel sheets 942 and 941 in PCM950, it is also necessary to spot weld the anode and cathode terminals 902 and 901 of the battery cell. In this way, the welding operation of the components needs to be paralleled with tin with a high failure rate. Two welding methods, welding and spot welding with a relatively low failure rate, lead to complicated product structure and manufacturing process, which eventually lead to an increase in working hours and a rise in product prices, and increase the failure rate of the product itself structurally.

[0007] In addition, in the existing built-in battery pack, the anode terminal 902 and the cathode terminal 901 formed on the upper side of the battery unit 900 are usually spot-welded with the composite metal 910 and the bimetal insert forming blocks 921, 922 respectively. The PCM guide block 930 is bonded and fixed with a common adhesive above. The method (structure) of the top cover 960 of this battery cell is very complicated in its manufacturing process and combination structure, and it is necessary to have a PCM guide block 930 with a complicated shape. And the top cover, etc. are precisely formed, so it is labor-intensive and time-consuming, and the cost is high

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