CN2491966Y

CN2491966Y - Column secondary battery

Info

Publication number: CN2491966Y
Application number: CN 01242474
Authority: CN
Inventors: 王传福; 孙一藻; 高海
Original assignee: Shenzhen BYD Industrial Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2001-07-04
Filing date: 2001-07-04
Publication date: 2002-05-15
Anticipated expiration: 2011-07-04

Abstract

The utility model relates to a column-shaped secondary battery, wherein a battery shell is a circular inner projecting step formed by the non-notching procedure, seals of a combined capping and the battery shell are fixed by the laser welding sealing in place of the flanging sealing. The combined capping further comprises an upper capping, an explosion-proof ball, rivets, a sealing ring, and a bottom capping, and the improved battery capacity is promoted by 5 percent, while the battery leaking rate is reduced by 3 percent or so, and the notching procedure is saved simultaneously.

Description

Column secondary battery

The utility model relates to a kind of column secondary battery, more particularly relates to hermetically-sealed construction wherein, comprises combination cover cap and seals.

Conventional cylindrical battery generally comprises battery case, combination cover cap, be encapsulated in wherein cylindrical electric core and the electrolyte made by positive pole, barrier film, the stacked coiling of negative pole.Wherein, combination cover cap generally comprises the annular loam cake of crown cap, the annular bottom and the quilt cover of central part perforate is pressed in the rubber bodies that is used for the perforate of center seal portion in the cap of top, make annular loam cake, annular bottom integrated by welding, promptly make the combination cover cap that conventional cylindrical battery is used; The course of processing of battery case generally comprises the cylinder box hat of making an end opening by mechanical stamping, carries out electronickelling and handles, and obtains the nickel plating box hat; Box hat put into by cylindrical electric core after the jet-bedding operation makes box hat form ring-type convex step, and combination cover cap places the convex step and seals fixing through flange sealing machine flange through seal washer.In above-mentioned cylindrical batteries and preparation process, part comes with some shortcomings: the flange that (1) flange sealing process produces makes the dischargeable capacity of battery less than normal, causes battery capacity on the low side; (2) the jet-bedding operation tends to destroy the battery case nickel coating, makes it to come off, loosens, and especially for alkaline battery, causes battery case to be corroded by electrolyte; (3) seal washer can rupture through the flange sealing process, and the liquid that produces electrolysis leaks, and alkaline battery is commonly called as " climbing alkali " phenomenon.

The purpose of this utility model be for overcome above-mentioned conventional batteries dischargeable capacity less than normal, omit the jet-bedding operation, prevent or reduce electrolyte corrosion cell shell and " climbing alkali " and a kind of column secondary battery is provided.

Column secondary battery of the present utility model, comprise battery case, combination cover cap, be encapsulated in wherein cylindrical electric core and the electrolyte made by positive pole, barrier film, the stacked coiling of negative pole, it is characterized in that: described battery case does not have the ring-type convex step that the jet-bedding operation forms, and sealing in the laser welding sealing mode of combination cover cap and battery case replaces the flange sealing mode to fix;

Described combination cover cap further comprises cap, explosion-proof ball, rivet, sealing ring, bottom, and compound mode is described below:

Bottom is designed to the center drilling of the recessed inwards and depression in upper and lower two surfaces of core, utilize injection moulding or other usual manner to form the sealing ring of less perforate in depression and aperture portion, there is the rivet of littler perforate to insert the sealing ring perforate design, rivet external diameter and sealing ring perforate pore size adapt, riveting makes rivet, sealing ring, bottom form a close body, sealing rivet perforate after the last cap compression of explosion-proof ball through exhaust outlet is arranged, last cap and rivet head welding are fixing; Described combination cover cap can also comprise gland, is fixed in the sealing ring lower surface by rivet.

The column secondary battery battery capacity of the present utility model 50mAh that on average risen promptly improves 5%, and it is about 3% that the battery leakage rate descends, and also omits the jet-bedding operation simultaneously.

Fig. 1 is a column secondary battery profile of the present utility model;

Fig. 2 is the utility model column secondary battery combination cover cap profile.

Below in conjunction with accompanying drawing the utility model is elaborated:

The reference numeral explanation:

1-battery case, the cylindrical electric core of 2-, 3-combination cover cap (not indicating among the figure), 4-laser welding sealing, the last cap of 31-, 32-explosion-proof ball, 33-rivet, 34-sealing ring, 35-bottom, the 36-gland

Embodiment 1:

As shown in Figure 2, make the ring external diameter 13.5mm of the bottom 35 of combination cover cap 3, on the core, the following cambered inwards fovea superior 8.5mm in two surfaces, the center drilling internal diameter 3.6mm of recessed 7.5mm and depression, utilize injection moulding or other usual manner to form the sealing ring 34 of perforate internal diameter 2.8mm in depression and aperture portion, sealing ring 34 lower surface additional ring external diameter 7.0mm, the gland of perforate internal diameter 2.8mm, with perforate internal diameter 1.8mm, the rivet 33 of high 3.0mm inserts sealing ring 34 perforates, riveting makes rivet 33, sealing ring 34, bottom 35, gland 36 forms a close body, long 2.8mm * diameter 2.5mm explosion-proof ball 32 is had exhaust outlet, external loop diameter 8.0mm, cap footpath 4.8mm, last cap 31 compressions 50% back sealing rivet 33 perforates of high footpath 1.8mm, last cap 31 is fixing with the welding of rivet 33 heads;

Test combination cover cap air-tightness: the combination cover cap and the open cell shell welded seal that will have the said structure of liquid injection port, but liquid injection port is tightly connected with the gas circuit that has the step-less adjustment air pressure size of pressure gauge, feed gases at high pressure, ascendingly (be set at 20kg/cm ²) be adjusted to and make battery case distortion, not having rises splits disappointingly, shows good airproof performance; Average explosion-proof pressure is 32-40kg/cm ²

As shown in Figure 1, be example with AA type battery, make long 48.0mm * overall diameter 13.9mm * wall thickness 0.3mm and open-topped cylindrical nickel plating battery steel shell 1, make cylindrical nickel-cadmium cell electricity core 2 with the method for routine, its aspect ratio routine has improved 1.6mm; With electric core 2 battery case 1 of packing into, positive terminal is connected with the gland 36 of combination cover cap 3, negative terminal contacts with the inwall of battery case 1, injects electrolyte, with combination cover cap 3 and battery case 1 sealing, promptly makes cylindrical nickel-cadmium cell in the laser welding mode.Make as above 100 on battery, volume test shows, the battery capacity 50mAh that on average risen promptly improves 5%; To its charging 10 minutes, interior pressure was about 1Mpa, places 12 hours, detects 0 of leakage number of batteries with phthalein phenol with 50mA, and the conventional cylindrical nickel-cadmium cell leakage of making about 3%; With above-mentioned battery overcharge and explosive test, meet relevant safety standard requirement.

Preferred embodiment of the utility model has been described above in conjunction with the accompanying drawings.But, should be clear and definite, the embodiment that the utility model is not limited to narrate above, person skilled in art can make various modifications and replace and also belong to the utility model under the situation that does not depart from the spirit or scope that the appended every claim of the utility model defines.

Claims

1. column secondary battery, comprise battery case (1), combination cover cap (3), be encapsulated in wherein cylindrical electric core (2) and the electrolyte made by positive pole, barrier film, the stacked coiling of negative pole, it is characterized in that: the ring-type convex step that the no jet-bedding operation of described battery case (1) forms, combination cover cap (3) replaces the flange sealing mode to fix with seal (4) of battery case (1) in the laser welding sealing mode.

2. column secondary battery according to claim 1, it is characterized in that: described combination cover cap (3) comprises cap (31), explosion-proof ball (32), rivet (33), sealing ring (34), bottom (35), compound mode is described below: bottom (35) be designed to core on, following two surfaces recessed inwards and the depression center drilling, utilize injection moulding or other usual manner to form the sealing ring (34) of less perforate in depression and aperture portion, there is the rivet (33) of littler perforate to insert sealing ring (34) perforate design, rivet (33) external diameter and sealing ring (34) perforate pore size adapt, riveting makes rivet (33), sealing ring (34), bottom (35) forms a close body, sealing rivet (33) perforate after last cap (31) compression of explosion-proof ball (32) through exhaust outlet is arranged, last cap (31) is fixing with the welding of rivet (33) head.

3. column secondary battery according to claim 2 is characterized in that: described combination cover cap (3) also comprises gland (36), is fixed in sealing ring (34) lower surface by rivet (33).