CN201041821Y

CN201041821Y - An encapsulation structure for soft electric core lithium battery

Info

Publication number: CN201041821Y
Application number: CNU2007200508669U
Authority: CN
Inventors: 陶育松; 姜香丽; 林斌; 阮旭松; 陈敏
Original assignee: Huizhou Desay Battery Co Ltd
Current assignee: Huizhou Desay Battery Co Ltd
Priority date: 2007-04-23
Filing date: 2007-04-23
Publication date: 2008-03-26
Anticipated expiration: 2017-04-23

Abstract

The utility model relates to the technical field of a lithium battery, in particular to the improvement of a soft electric-core lithium battery package structure. A shell body is enclosed outside of the soft electric core, a protection board that is connected with a tab of the electric core is arranged inside the shell body, the shell body consists of a metal face cover and a metal bottom cover, which are buckled with each other. The bodies of the face cover and the bottom cover are thin-typed trough-shaped bodies that are punched with the metal sheet, the front end surface of the face cover and the bottom end part that is connected with the front end surface of the face cover are L-shaped plastic bodies in the way of injection molding, the rear end surface of the bottom cover is formed a plastic end surface through the injection molding, the front end surface of the face cover wraps the front end surface of the bottom cover, and the rear end surface of the face cover is wrapped by the rear end surface of the bottom cover. The utility model adopts the metal shell to pack the soft electric core, therefore, the electric core packed by the metal shell is thicker than the electric core packed by the conventional plastic shell under the condition of making the battery in the same thickness, the capacity of the battery is effectively increased and the abrasion-resistant ability and the impact-resistant ability of the metal shell are high; at the same time, the damage of the electric core caused by the damage of the plastic shell is effectively prevented.

Description

A kind of encapsulating structure of soft electric core lithium battery

Technical field

The utility model relates to technical field of lithium batteries, is specifically related to the improvement of the lithium battery encapsulating structure of soft electric core.

Background technology

Along with the development of lithium-ion electric pool technology, its cost performance improves constantly, and causes lithium battery by all trades and professions extensive use.Nearly one or two years,, had higher requirement in the aspects such as encapsulation of capacity, charge-discharge performance and the battery battery core of lithium battery along with the develop rapidly of mechanics of communication.

When lithium battery uses generally speaking also will by battery case or similarly the installation position install, and compress mechanism by spring etc. and position and be electrically connected, this just needs built-in battery have higher rigidity.At present, the lithium battery packing forms of soft electric core adopts plastic shell more, and pass through electric core injection mo(u)lding is encapsulated.The glue housing battery of injection moulding encapsulation not only forms burr easily, and molten resin material can damage the interior battery of housing, because for hot and pressure, battery may be flimsy inner member when battery in the metal die contact during injection moulding.Moreover because the requirement of plastic mould moulding has limited the thickness of glue shell, if thickness is just very difficult and be difficult to ensure the safety of electric core less than 0.35 millimeter shaping, this reduces package thickness with lithium battery in the industry as far as possible, it is inconsistent with this idea that improves capacity to wish, but does not all have solution preferably always.

The utility model content

Problem to be solved in the utility model provides a kind of thin metal-packaged shell that has, and can improve the encapsulating structure of the soft core lithium battery of battery capacity.

For solving the problems of the technologies described above, the technical scheme that the utility model is realized is:

Design a kind of encapsulating structure of soft core lithium battery, comprise soft electric core, soft electric core has the housing encapsulation outward, also is packaged with the baffle that connects with cell polar ear in the housing, and described housing is fastened by metal covering lid and bottom lid and forms.

Cover, bottom body are for to strike out slim groove shape body by sheet metal in the such scheme, the front end face of cover and the cover bottom end injection moulding that is connected with the cover front end face form L shaped plastic body, the rear end face of bottom forms the plastic cement end face by injection moulding, cover front end face inclusion is lived the bottom front end face, and the cover rear end face is by bottom rear end face inclusion.

For the ease of the location between bottom, the cover, the side of cover, bottom is provided with the locking edge of projection, and the bottom rear end face is provided with the draw-in groove that can engage the protecgulum rear end face, is provided with the shell fragment of projection in the draw-in groove.

The L shaped plastic body that is positioned at the cover bottom surface is provided with the through hole that can expose lead-out terminal on the baffle, also is injected with the positioning rubber column that is used for fixing baffle on the L shaped plastic body of through hole both sides.

Further improvement as such scheme has hole for injecting glue on the rear end face of bottom, and has the end face hole for injecting glue on the cover front end face, perhaps is provided with the bottom surface hole for injecting glue in the end, bottom bottom surface near the bottom front end face.

The utility model compared with prior art has following advantage:

The utility model adopts the housing of metal stainless steel substrates to encapsulate soft electric core, make under the situation of making the same thickness battery, the electric core of sheet metal encapsulation is thicker than the electric core thickness of conventional plastic cement shell encapsulation, the capacity of battery is increased effectively, metal shell resistance to wears and the impact resistance height, has avoided the plastic shell cracky effectively and the electric core that causes damages.

Description of drawings

Fig. 1 is the exploded perspective view of utility model; Fig. 2 is the structural representation of cover among Fig. 1;

Fig. 3 is the reverse side structural representation of Fig. 2 cover; Fig. 4 is the structural representation of bottom among Fig. 1;

Fig. 5 is the reverse side structural representation of Fig. 4 bottom;

Specific embodiments

The utility model is described in further detail below by specific embodiment:

Referring to Fig. 1～5, a kind of encapsulating structure of soft core lithium battery, soft electric core 4 front ends are connected with the baffle that cell polar ear connects, electric core with and the housing encapsulation made by the super thin metal sheet of baffle.The relative plastic casing of housing that the super thin metal sheet is made can make the battery attenuation.

Metal shell is fastened by cover and bottom and forms in the present embodiment, cover 1, bottom 5 are the slim groove shape bodies that formed by the punching press of stainless steel metal sheet, the front end face 10 of cover and 17 ends, cover bottom surface that are connected with the cover front end face are plastic bodies, this plastic body is L shaped plastic body 11, and L shaped plastic body is by forming the injection moulding of stainless steel cover body.The L shaped plastic body that is positioned on the cover bottom surface is provided with through hole 12, should by with electric core baffle on the lead-out terminal sizableness so that expose lead-out terminal on the baffle.Also be injected with two positioning rubber columns 13 on the L shaped plastic body of through hole both sides, the glue post is used for fixing baffle here.The baffle of electricity core directly is fixed on the bottom surface of cover, and electric core lead-out terminal is drawn from cover bottom surface through hole can further make the attenuation of electric core shell body.

When cover and bottom fastening, the locking edge 8 of cover lateral projections stretches into the side of bottom, and the locking edge of projection then stretches in the side of cover on the bottom side, forms the syndeton of the gesture of fastening mutually.After cover, bottom fastened simultaneously, the front end face 55 of bottom was by 10 obvolvents of cover front end face, and the rear end face 51 of bottom then is the rear end face 16 of obvolvent cover.The rear end face 51 of bottom also is the plastic cement end face that forms by to the injection moulding of stainless steel bottom body, in order to make bottom rear end face more firm to the rear end face obvolvent of cover, but on bottom rear end face inwall, also be provided with the draw-in groove 7 of snap-latch surface cover back-end face, when the cover bottom fastens the cover rear end face is inserted in the draw-in groove of bottom rear end face, and by in the draw-in groove be provided with the projection shell fragment block the rear end face of cover, thereby make fastening more firm.Draw-in groove is arranged on the bottom rear end face in the present embodiment, according to actual needs draw-in groove can be set also on the front end face of cover.

For further fixing, can on the front end face of cover, offer end face hole for injecting glue 15, the bottom front end face is opened and also is provided with aperture, and the cover bottom can inject colloid by hole for injecting glue after fastening, and the aperture that colloid flows to the bottom front end face makes more firm the combining of cover bottom.Certainly, after cover, bottom fasten, when the cover front end face is not opened hole for injecting glue, also can promptly near the position of bottom front end face bottom surface hole for injecting glue 54 be set at bottom bottom surface 56 front ends, injecting glue also can make the cover bottom fix thus.

Also have hole for injecting glue 53 on the rear end face of same bottom, and also have aperture on the rear end face 16 of cover, after the stainless steel substrates rear end face of cover inserts the draw-in groove of bottom rear end face, further make the combination of rear end face of cover, bottom more firm by injecting glue.

The utility model adopts the stainless steel substrates housing to encapsulate electric core, makes encapsulating housing thickness reduce, thereby can improve the capacity of battery.The metal shell that encapsulates in the practical application also can be other sheet metals such as aluminium flake.

The utility model is claimed to be the structure of metal shell encapsulation lithium battery; the injection moulding plastic body being convenient to encapsulate respectively on cover, the bottom; the plastic body of practical application injection moulding can be the front and back end that is injection-moulded in cover fully, also can be the front and back end that is injection-moulded in bottom.And under the not high situation of requirement of strength, the draw-in groove of the plastic body setting of bottom rear end face and the locking edge of cover bottom also can omit, thereby simplify the structure of cover, bottom.

Claims

1. the encapsulating structure of a soft electric core lithium battery; comprise soft electric core (4); soft electric core has the housing encapsulation outward, also is packaged with the baffle that connects with cell polar ear in the housing, and it is characterized in that: described housing is fastened and connected by metal cover (1) and bottom (5) and forms.

2. according to the encapsulating structure of the described soft electric core lithium battery of claim 1, it is characterized in that: described cover (1), bottom (4) body are for to strike out slim groove shape body by sheet metal, the front end face of cover and cover bottom surface (17) the end injection moulding that is connected with the cover front end face form L shaped plastic body (11), the rear end face of bottom (51) is the plastic cement end face that forms by injection moulding, cover front end face (10) inclusion is lived bottom front end face (55), and cover rear end face (16) is by bottom rear end face (51) inclusion.

3. according to the encapsulating structure of the described soft electric core lithium battery of claim 2, it is characterized in that: the side of described cover, bottom is provided with the locking edge of projection, and the bottom rear end face is provided with the draw-in groove (7) that can engage the protecgulum rear end face.

4. according to the encapsulating structure of the described soft electric core lithium battery of claim 3, it is characterized in that: the shell fragment that is provided with projection in the draw-in groove of described bonnet rear end face.

5. according to the encapsulating structure of the described soft electric core lithium battery of claim 4; it is characterized in that: the L shaped plastic body that is positioned at cover bottom surface (17) is provided with the through hole (12) that can expose lead-out terminal on the baffle, also is injected with the positioning rubber column (13) that is used for fixing baffle on the L shaped plastic body of through hole both sides.

6. according to the encapsulating structure of the described soft electric core lithium battery of claim 5, it is characterized in that: have hole for injecting glue (53) on the rear end face of described bottom (51).

7. according to the encapsulating structure of the described soft electric core lithium battery of claim 6, it is characterized in that: the front end place, bottom bottom surface (56) near the bottom front end face is provided with bottom surface hole for injecting glue (54).

8. according to the encapsulating structure of the described soft electric core lithium battery of claim 6, it is characterized in that: offer on the described cover front end face and have end face hole for injecting glue (15).