CN201349035Y

CN201349035Y - Secondary battery

Info

Publication number: CN201349035Y
Application number: CNU2009201292001U
Authority: CN
Inventors: 伦玉华
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2009-01-12
Filing date: 2009-01-12
Publication date: 2009-11-18
Anticipated expiration: 2019-01-12

Abstract

The utility model discloses a secondary battery, which comprises a battery casing, a seal ring, a cover cap, an electrode assembly, and an electrolyte. The electrode assembly is prepared from a positive electrode, a diaphragm and a negative electrode, is installed inside the battery casing and is soaked in the electrolyte, the electrode assembly is sealed with the battery casing via the cover cap and the seal ring, and a first electrode lug and a second electrode lug are led out from the electrode assembly; the seal ring consists of a columnar side wall, a ring-shaped boss and a round ring for preventing short circuit; the ring-shaped boss is hollow, the round ring is arranged inside the ring-shaped boss and is connected with the lower end of the ring-shaped boss, and the upper end of the ring-shaped boss is connected with the columnar side wall together; the first electrode lug passes through the space of the round ring and is connected with the cover cap; and the second electrode lug is connected with the battery casing. The battery seal ring of the secondary battery adopts a novel structure in which the round ring is additionally arranged to effectively reduce the short circuit ratio of the secondary battery. The secondary battery provided by the utility model has a simple structure and is convenient for processing.

Description

A kind of secondary cell

Technical field

The utility model relates to battery, more particularly, relates to a kind of secondary cell.

Background technology

Sealing ring is the major issue of battery quality; battery is made flow process and is in the battery assembling process: volume battery-put face pad-jet-bedding to put the oil-fluid injection-put sealing ring-spot welding block-by cap-seal etc.; usually the problem of ring structure can occur and influence production putting the sealing ring operation; in actual production, the rate of finished products influence that the difference of ring structure form is made battery is very big.

At present, existing cell sealing coil structures is single, and among production process, the battery short circuit fraction defective is very high after sealing especially, thereby the battery rate of finished products is very low.

The utility model content

Inventor of the present utility model finds to cause battery pole ear and battery container short circuit easily owing to the reason of common batteries ring structure, thereby influences the battery rate of finished products through repeatedly research and experiment.

The purpose of this utility model is to overcome traditional secondary battery seal ring structural reason and causes the defective of battery pole ear and battery container short circuit, and a kind of new secondary cell sealing ring is provided, thereby improves the rate of finished products of secondary cell.

The utility model provides a kind of secondary cell, comprises battery case, sealing ring, block, and the electrode group, electrolyte,

Wherein, the electrode group is by positive pole, barrier film, and negative pole is reeled and is made, and electrode is assembled in the battery case and for electrolyte soaks, the electrode group is by block, and sealing ring and battery case seal, and described electrode group leads to first lug and second lug;

It is characterized in that: described sealing ring comprises cylindrical side wall, annular boss and the annulus that prevents short circuit; Annular boss is a hollow form, and described annulus is connected in annular boss and with the annular boss lower end, and annular boss upper end and cylindrical side wall connect as one;

Described first lug passes the space on the described annulus, and is connected with block; Described second lug is connected with battery case.

The utility model provides a kind of secondary cell, and the battery seal ring of this secondary cell adopts new structure, has promptly increased by an annulus, and the design of this annulus has effectively reduced the secondary cell short circuit ratio, and the utility model is simple in structure, and is easy to process.

Description of drawings

A kind of secondary cell that Fig. 1 provides for the utility model partly cut open structural representation;

Fig. 2 is that cut-away view is amplified in the part of Fig. 1;

The floor map of a kind of battery seal ring of a kind of secondary cell that Fig. 3 the utility model provides;

Fig. 4 is the cut-away view of Fig. 3;

The stereogram of a kind of battery seal ring of a kind of secondary cell that Fig. 5 the utility model provides;

The generalized section of second kind of battery seal ring of a kind of secondary cell that Fig. 6 the utility model provides;

The comparative graph of Fig. 7 the utility model embodiment and Comparative Examples.

Embodiment

Describe the utility model in detail below in conjunction with accompanying drawing.

See figures.1.and.2, the utility model provides a kind of secondary cell, comprises battery case 1, sealing ring 2, block 3; The electrode group, the electrolyte (not shown),

Wherein, the electrode group is by positive pole 5, barrier film 4, negative pole 6 is reeled and is made, and electrode is assembled in the battery case 1 and for electrolyte soaks, the electrode group is by block 3, sealing ring 2 and battery case 1 sealing, described electrode group leads to first lug 7 and the second lug (not shown);

As Fig. 3, Fig. 4 and shown in Figure 5, described sealing ring 3 comprises cylindrical side wall 21, annular boss 22 and the annulus 23 that prevents short circuit; Annular boss 22 is a hollow form, and with convenient follow-up production assembling, described annulus 23 is connected in annular boss 22 and with annular boss 22 lower ends, and annular boss 22 upper ends and cylindrical side wall 21 connect as one;

Described first lug 7 passes the space on the described annulus, and is connected with block 3, and described second lug is connected with battery case 1.

The method preparation that the sealing ring 2 that the utility model provides can adopt mechanical field to know arbitrarily; Such as injection mo(u)lding, the material of sealing ring 2 is generally selected megohmite insulant for use, such as plastics, and anti-bakelite etc.

The thickness of described sealing ring 2 can be decided according to the kind and the preparation needs of battery.

The annulus 23 that sealing ring 2 comprises as Fig. 3 and Fig. 4, is being put into battery when sealing ring 2, and the insulation property of sealing ring 2 prevent battery short circuit.

Described annulus 23 and convex annular can also be provided with the tie point (not shown) between 22 lower ends, and described tie point is more than 2; Being provided with of tie point can solve the insulation effect that sealing ring 2 plays well in Battery Pole Core, and can prevent first lug, 7 contact battery cases 1, plays a protective role; The size of tie point and shape can determine that the position of tie point also can be determined by the size of annulus 23 according to the requirement of battery seal ring 2.

Pass space on the described annulus for first lug 7, if first lug 7 is positive pole ears, second lug is a negative lug so, and the positive pole ear of battery can pass this space and be connected with battery cap 3, and negative lug can be connected with battery container 1; If first lug 7 is negative lug, second lug is a positive pole ear so, and the negative lug of battery can be passed this space and is connected with battery cap 3, and positive pole ear can be connected with battery container 1; Annulus 23 is simple in structure, and convenient first lug 7 is located and passed, and the battery assembling is more convenient, and first lug 7 is not easy and 1 short circuit of battery case; In addition, what the spatial area that first lug 7 passes should be with first lug 7 is big or small suitable, can make first lug, 7 location more accurate, and first lug 7 is not easy when bending or twisting and 1 of battery container is short-circuited.

The thickness of battery annulus 23 is the 0.1-0.24 millimeter, preferred 0.2 millimeter, can determine according to the requirement of battery itself.

The inner surface centre section of the cylindrical side wall 21 of sealing ring 2 is an inverted cone-shaped structure, as Fig. 6, wherein, the top thickness of cylindrical side wall 21 is than the big 0.03-0.07 millimeter of bottom thickness, preferred 0.05 millimeter, sealing ring 2 diameter differences according to the different model battery are selected, and lower sidewall has one section for straight wall, and the thickness of this segment length and battery cap 3 is close.When making battery, to block a shot and 3 nestedly advance sealing ring 2, because sealing ring 2 sidewalls are inverted cone-shaped structure, the inverted cone-shaped structure of block 3 sealed circles 2 is tightly blocked, even the variation of the accessory of battery does not have block yet and 3 drops, 7 pairs of blocks 3 of first lug have bounce when battery seal, but inverted cone-shaped structure can effectively guarantee to block a shot and 3 can not eject from sealing ring 2, thereby the battery seal of stopping is bad, has reduced the leakage problem of finished product battery later stage operation.

A kind of secondary cell manufacture method of the present utility model: the utility model is an example with ni-mh/nickel-cadmium cell;

Sealing ring is made: can adopt various non-conducting material well known in the art to make, expect as PA66-1300S; Can determine according to battery size; Battery seal ring described in the utility model can wholely be made, and is used for the integrated through injection molding moulding.

Battery is made:

Make pole piece: produce nickel positive pole, cadmium cathode with general method;

Reel: will produce nickel positive pole, cadmium cathode and barrier film combine, and reel with half-automatic winder and to make pole piece;

Dress shell: in coiling is packed cylinder type nickel plating box hat into;

Put the oil: put the oil with nickel plating box hat jet-bedding and with inwall on the box hat, can make the better tightness of battery like this, and can prevent battery leakage;

Annotate alkali lye: will inject alkali lye in the semi-finished product under the above-mentioned operation;

Put sealing ring: the sealing ring that will produce is placed in the battery case; In the present embodiment promptly, first lug is a positive pole ear, and the positive pole ear of battery passes the space on the sealing ring; And the positive pole ear of battery is connected with battery cap spot welding, and negative pole is connected with battery container;

By blocking a shot: block is pressed in the respective battery;

Seal: battery is sealed with automatic sealing;

Subsequent handling: comprise the charging of battery, detect that packing etc. is finished battery and made.

According to secondary cell provided by the utility model, also comprise other necessary assembly that battery pack is required, and the assembly method of battery pack is conventionally known to one of skill in the art, do not repeat them here.

Embodiment 1:

The making of sealing ring 2, the method preparation of described sealing ring 2 usefulness injection mouldings, present embodiment 1 adopts the annulus thickness of sealing ring 2 to select 0.2 millimeter.

Battery is made: combine with general nickel positive pole, cadmium cathode and barrier film, in coiling is packed cylinder type nickel plating box hat into, the electrode group leads to first lug 7 and second lug, first lug 7 is a positive pole ear, and second lug is a negative lug, and the positive pole ear of battery passes sealing ring 2 and is connected with battery cap 3, negative lug is connected with battery container 1, install sealing ring 2, inject alkali lye, follow-up operations such as charging; Adopt above-mentioned sealing ring, and the capacity of producing is certain Sc type battery, this battery is designated as A1; Finishing battery makes.

Embodiment 2:

The making of sealing ring 2, the method preparation of described sealing ring 2 usefulness injection mouldings, present embodiment 2 adopts the annulus thickness of sealing ring 2 to select 0.25 millimeter.

Battery is made: combine with general nickel positive pole, cadmium cathode and barrier film, in coiling is packed cylinder type nickel plating box hat into, the electrode group leads to first lug 7 and second lug, first lug 7 is a positive pole ear, and second lug is a negative lug, and the positive pole ear of battery passes lug and passes the hole and be connected with battery cap 3, negative lug is connected with battery container 1, install sealing ring 2, inject alkali lye, follow-up operations such as charging; Adopt above-mentioned sealing ring 2, and the capacity of producing is certain Sc type battery, this battery is designated as A2.

Embodiment 3:

The making of sealing ring 2, as shown in Figure 6, the preparation of the method for described sealing ring 2 usefulness injection mouldings, present embodiment 1 adopts the annulus thickness of sealing ring 2 to select 0.2 millimeter, and adopt inverted cone-shaped structure on the cylindrical side wall of sealing ring 2, the top thickness of cylindrical side wall is bigger 0.05 millimeter than bottom thickness.

Battery is made: combine with general nickel positive pole, cadmium cathode and barrier film, in coiling is packed cylinder type nickel plating box hat into, the electrode group leads to first lug 7 and second lug, first lug 7 is a positive pole ear, and second lug is a negative lug, and the positive pole ear of battery passes sealing ring 2 and is connected with battery cap 3, negative lug is connected with battery container 1, install sealing ring 2, inject alkali lye, follow-up operations such as charging; Adopt above-mentioned sealing ring 2, and the capacity of producing is certain Sc type battery, this battery is designated as A3.

Comparative example:

According to prior art, comparative example adopts general sealing ring.

Battery is made: combine with general nickel positive pole, cadmium cathode and barrier film, in coiling is packed cylinder type nickel plating box hat into, inject alkali lye, adopt general sealing ring, and the capacity of producing is certain Sc type battery that this battery is remembered A4.

As seen from Figure 7, make 10000 batteries according to same material and method, adopt the battery A3 of ring structure of the present utility model, the finished product fraction defective of A2, A1 obviously reduces, because the variation of ring structure of the present utility model, the design of this annulus 23 is provided with like this and has reduced the battery short circuit rate, and has improved the rate of finished products of battery.

The embodiment of the above is a better embodiment of the present utility model, is not to limit concrete practical range of the present utility model with this, and the equivalence that all shapes according to the utility model, structure are done changes all in protection range of the present utility model.

Although carefully described the utility model with reference to its specific execution mode, but it will be understood to those of skill in the art that, under the prerequisite of the spirit and scope of the present utility model that do not deviate from the claims qualification, can make various changes in form and details.

Claims

1. a secondary cell comprises battery case, sealing ring, block, and the electrode group, electrolyte,

2. secondary cell as claimed in claim 1 is characterized in that: the thickness of described annulus is the 0.1-0.24 millimeter.

3. secondary cell as claimed in claim 1 is characterized in that: the inner surface centre section of described cylindrical side wall is an inverted cone-shaped structure.

4. secondary cell as claimed in claim 3 is characterized in that: the top thickness of described cylindrical side wall is than the big 0.03-0.07 millimeter of bottom thickness.