CN201887117U

CN201887117U - Flat cell

Info

Publication number: CN201887117U
Application number: CN2010206431484U
Authority: CN
Inventors: 李亚德; 祝媛; 袁中直; 刘金成
Original assignee: Eve Energy Co Ltd
Current assignee: Eve Energy Co Ltd
Priority date: 2010-11-25
Filing date: 2010-11-25
Publication date: 2011-06-29
Anticipated expiration: 2020-11-25

Abstract

The utility model relates to a flat cell, in particular to a flat lithium cell. The flat cell comprises a flat cell shell and a cover body welded together with the cell shell, wherein the cell shell comprises an upper wall, a lower wall opposite to the upper wall, and a side wall connecting the upper wall and the lower wall; and strengthening ribs substantially parallel to the cover body are arranged on both the upper wall and the lower wall of the cell shell. In the flat cell provided by the utility model, as the strengthening ribs substantially parallel to the cover body of the cell are arranged on both the upper wall and the lower wall of the flat cell shell, the strength of both the upper wall and the lower wall with larger areas is increased; and when the internal pressure of the cell is increased, the stress of the cell shell is uniform, and ballooning generated on both the upper wall and the lower wall and ballooning generated on the side wall are more consistent, so that the seam crossing of the cell shell and the cover body is uniformly stressed and has low probability of cracks, and the security of the cell is increased. The flat cell provided by the utility model can be applied to equipment demanding more on security of cells, such as implantable medical equipment.

Description

A kind of flat cell

Technical field

The utility model relates to lithium battery, and particularly a kind of profile is the lithium battery of flat.

Background technology

For safety, the housing of lithium battery generally all adopts all-sealed structure, and this causes lithium battery gas that produces in the process of using can't discharge battery container.Of long duration, battery container just slight bulging can occur.Be the lithium battery of flat for profile, bulging generally appears at the bigger upper wall and the lower wall (flat horizontal surface) of area of battery container, makes the seam crossing discontinuity of housing and lid.When the bulging phenomenon was serious, the seam crossing of upper wall or lower wall and lid can break, and causes leakage.

The utility model content

Technical problem to be solved in the utility model provides a kind of flat cell of architecture advances, when inner pressure of battery increases, and battery container stressed comparatively even.

The technical solution of the utility model is: a kind of flat cell comprises the battery container of flat and the lid that welds together with battery container.Described battery container comprises upper wall, the lower wall relative with upper wall, and the sidewall that connects described upper wall and lower wall.Be provided with on the upper wall of described battery container and the lower wall and the parallel reinforcement of described lid cardinal principle.

Described flat cell is the shape of a hoof substantially, and the material of described battery container and lid is a metal, to increase battery security.For simplifying technology, described reinforcement is stamped recess or the projection that forms on described upper wall and the lower wall.On the described lid pole is set, described pole is fixed on the described lid by insulating material.Described pole comprises the metal bar that two radicles weld together.First metal bar is connected with battery battery core and is fixed on the described lid by described insulating material, and the outer surface of second metal bar is gold-plated, is used for linking to each other with power consumption equipment.The electric core of described flat cell comprises two positive poles that are oppositely arranged, two negative poles between described positive pole, two group of first collector between described negative pole, second collector between described first collector, and be wrapped in the barrier film that is used to isolate described positive pole and negative pole and negative pole and battery container and lid outside the described negative pole.Described pole is fixedlyed connected with second collector.Described second collector is the nickel sheet, has through hole on it symmetrically, and the position of middle corresponding described pole is provided with a groove that is used to accommodate described pole; Described first collector is a steel mesh, and described every group first collector comprises two currect collecting nets, is separately fixed at described groove both sides.Described pole is with insulating sleeve from described lid to the position second collector, prevents battery short circuit.Be to increase insulation effect, described barrier film comprises diaphragm case and two-layerly is used to hide described diaphragm case to form the epiphragma of enclosure space.Described first epiphragma is arranged between second epiphragma and the lid, is polytetrafluoroethylene film, and described second epiphragma is the glass fibre film.Described just very carbon plate, described negative pole are the lithium sheet.

The utility model has following remarkable result compared to existing technology:

Be provided with on the upper wall of flat cell housing of the present utility model and the lower wall and the parallel reinforcement of battery lid cardinal principle, the bigger upper wall of area and the intensity of lower wall have been increased, battery container is stressed more even when inner pressure of battery increases, the bulging phenomenon that occurs in upper wall and lower wall is more consistent with the bulging phenomenon that occurs in sidewall, thereby the seam crossing of battery container and lid is stressed evenly, be not prone to and break, increased the fail safe of battery.This flat cell can be applicable to equipment that battery security is had relatively high expectations, for example implantable medical device.

Description of drawings

Fig. 1 is that the master of flat cell among the embodiment looks schematic diagram.

Fig. 2 is the decomposing schematic representation of flat cell among the embodiment.

Embodiment

Describe in further detail below in conjunction with specific embodiment and accompanying drawing structural principle the utility model flat cell.

As depicted in figs. 1 and 2, the flat cell 800 of the utility model one embodiment comprises and is horseshoe-shaped housing 10 substantially, the lid 30 that interlocks and be tightly connected with housing 10, and place electric core (not shown) in the confined space that housing 10 and lid 30 form.Housing 10 is flat, comprises upper wall 11, the lower wall 12 relative with upper wall 11, and the sidewall 13 that connects upper wall 11 and lower wall 12.Upper wall 11 and lower wall 12 form the flat horizontal surface of flat cell 800, and area is bigger.Each wall of battery is stressed evenly when inner pressure of battery is increased, and be provided with on the housing 10 and the parallel reinforcement 111 of lid 30 cardinal principles, and the end of reinforcement 111 does not join with sidewall 13.

In the present embodiment, flat cell 800 is a lithium primary battery, for example the primary cell of lithium/thinly chloride (Li/SOCl2), lithium/chlorosulfuric acid (Li/SO2C12), lithium/sulfur dioxide (Li/SO2), lithium/manganese dioxide (Li/MnO2), lithium/iron disulfide (Li/FeS2) and lithium/sulphur chemical systems such as (Li/S).Battery container 10 and lid 30 adopt have certain intensity and not with the metal material of electrolyte generation chemical reaction, as metal or alloy such as stainless steel, carbon steels.Groove or the projection of reinforcement 111 for being stamped to form on upper wall 11 and the lower wall 12.Certainly, reinforcement 111 also can be the bonding jumper that is welded on upper wall 11 and the lower wall 12.

Lid 30 is rectangular substantially, and its mode by welding links to each other with housing 10.Lid 30 is provided with pole 31.Pole 31 is by insulating material, and for example glass insulator is fixed on lid 30 middle parts.Pole 31 comprises two sections metal bars that join.First metal bar 311 is connected with battery battery core and is fixed on the lid 30 by above-mentioned insulating material.The material of first metal bar 311 is identical with the material of housing 10 and lid 30.Second metal bar 312 is positioned at lid 30 outsides, adopts conductivity and last tin preferred metal material, to link to each other with power consumption equipment better.In the utility model, second metal bar, 312 outer surfaces are gold-plated, can effectively improve the electric connection with power consumption equipment.

Battery battery core comprises two positive poles 51 that are oppositely arranged, two negative poles 52 between anodal 51, two group of first collector 53 between negative pole 52, second collector 54 between two group of first collector 53, be wrapped in outside negative pole 52, first collector 53 and second collector 54, be used to isolate anodal 51 and the barrier film of negative pole 52 and negative pole 52 and battery container 10 and lid 30, and the electrolyte (not shown) that soaks into said elements.In the present embodiment, anodal 51 is carbon plate.Anodal 51 are roughness, to increase the cell reaction area.Negative pole 52 is the lithium sheet.First collector 53 is a steel mesh, and every group first collector 53 comprises two steel meshes.Second collector 54 is the nickel sheet, has through hole on it symmetrically, and the position of middle corresponding pole 31 is provided with a groove 542 that is used to accommodate pole 31.Above-mentioned two steel meshes are separately fixed at groove 542 both sides, are used to improve caking property, the order of contact of lithium sheet and steel mesh, improve battery performance.

Barrier film comprises diaphragm case 551 and two-layerly is used to hide diaphragm case 551 to form first epiphragma 553 and second epiphragma 555 of enclosure space.Diaphragm case 551 is for having the body of an opening and host cavity, can prevent effectively that the barrier film displacement from causing negative pole 52 and positive pole 51 to contact with housing 10 and causing battery short circuit.First epiphragma 553 is arranged between second epiphragma 555 and the lid 30, is polytetrafluoroethylene film.Second epiphragma is the glass fibre film.

Pole 31 passes the wall that forms groove 542 on first epiphragma 553 and second epiphragma 555 and second collector 54 and welds together.Cause battery short circuit for preventing that pole 31 from contacting with anodal 51 or housing 10, pole 31 is with insulating sleeve (not indicating) from the position lid 30 to second collectors 54.

To sum up, the utility model is by being provided with and the parallel reinforcement of battery lid cardinal principle on the upper wall of the housing of flat cell and lower wall, increased the intensity of upper wall and lower wall, thereby the seam crossing of battery container and lid is stressed evenly when inner pressure of battery increases, be not prone to and break, increased the fail safe of battery.The design of electricity core also improves battery performance and effectively prevents battery short circuit from a plurality of details, makes flat cell of the present utility model can be applicable to the various device that battery security is had relatively high expectations, for example implantable medical device.

Understandable, among other embodiment, the flat cell profile can be other shapes according to the different designs of applied environment, for example rectangular the or triangle of cardinal principle.Among other embodiment, flat cell 800 also can be that profile is battery flat, that belong to other chemical systems.

The above embodiment has only expressed execution mode of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model claim.Should be pointed out that for the person of ordinary skill of the art under the prerequisite that does not break away from the utility model design, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.

Claims

1. flat cell, comprise the battery container of flat and the lid that is connected with battery container, described battery container comprises upper wall, the lower wall relative with upper wall, and the sidewall that connects described upper wall and lower wall, it is characterized in that: be provided with on the upper wall of described battery container and the lower wall and the parallel reinforcement of described lid cardinal principle.

2. flat cell according to claim 1 is characterized in that, described reinforcement is groove or the projection on described upper wall and the lower wall.

3. flat cell according to claim 2 is characterized in that described flat cell is the shape of a hoof substantially, and the material of described battery container and lid is a metal, and described reinforcement is stamped recess or the projection that forms on described upper wall and the lower wall.

4. flat cell according to claim 3 is characterized in that, on the described lid pole is set, and described pole is fixed on the described lid by insulating material.

5. flat cell according to claim 4, it is characterized in that described pole comprises the metal bar that two radicles weld together, first metal bar is connected with battery battery core and is fixed on the lid by described insulating material, the outer surface of second metal bar is gold-plated, is used for linking to each other with power consumption equipment.

6. flat cell according to claim 4, it is characterized in that, the electric core of described flat cell comprises two positive poles that are oppositely arranged, two negative poles between described positive pole, two group of first collector between described negative pole, second collector between described first collector, and be wrapped in the barrier film that is used to isolate described positive pole and negative pole and negative pole and battery container and lid outside the described negative pole, described pole is fixedlyed connected with second collector.

7. flat cell according to claim 6 is characterized in that, described second collector is the nickel sheet, has through hole on it symmetrically, and the position of middle corresponding described pole is provided with a groove that is used to accommodate described pole; Described first collector is a steel mesh, and described every group first collector comprises two currect collecting nets, is separately fixed at described groove both sides.

8. flat cell according to claim 7 is characterized in that, described pole is with insulating sleeve from described lid to the position second collector.

9. flat cell according to claim 8, it is characterized in that, described barrier film comprises diaphragm case and two-layerly is used to hide described diaphragm case to form the epiphragma of enclosure space, described first epiphragma is arranged between second epiphragma and the lid, be polytetrafluoroethylene film, described second epiphragma is the glass fibre film.

10. flat cell according to claim 9 is characterized in that, described just very carbon plate, described negative pole are the lithium sheet.