CN215644698U

CN215644698U - Box-type large cylindrical battery cover plate structure

Info

Publication number: CN215644698U
Application number: CN202120524148.0U
Authority: CN
Inventors: 郭春泰; 陈保国; 李文文; 马华
Original assignee: Tianjin EV Energies Co Ltd
Current assignee: Tianjin EV Energies Co Ltd
Priority date: 2021-03-12
Filing date: 2021-03-12
Publication date: 2022-01-25
Anticipated expiration: 2031-03-12

Abstract

The utility model provides a box-type large cylindrical battery cover plate structure, which belongs to the field of power batteries and comprises a roll core, a shell and a cover plate assembly which are coaxially arranged, wherein the shell is of a cylindrical structure with an opening at the upper end; the upper end of the shell is closed and the roll core is fixed through the roller groove, or the concave convex point arranged at the upper end of the shell positions the roll core; the cover plate component is of a positive convex radian structure or an acicular pitted surface structure with convex points. The utility model increases the area of the winding core and the output electrode of the cover plate, increases the overcurrent capacity, reduces the leakage probability of the cylindrical battery and improves the quality.

Description

Box-type large cylindrical battery cover plate structure

Technical Field

The utility model belongs to the field of power batteries, relates to a lithium ion battery of a new energy automobile, and particularly relates to a box-type large cylindrical battery cover plate structure.

Background

The current commonly used cylindrical lithium ion battery structure is composed of a winding core (a welded pole lug), a cover plate, a cylindrical shell and other components, after a pole piece is coated, the pole lug is welded according to position definition, the pole piece is wound into the cylindrical winding core with the pole lug in a winding mode, the winding core is welded well through the pole lug and current collectors on the upper cover plate and the lower cover plate, and after the whole body is pushed into the cylindrical shell, a roller groove is formed in the top of the shell, so that the shell limits the up-and-down movement of the winding core; the cover plate and the shell are fixed together in a mechanical compression joint mode, and the shell and the cover plate are deformed through mechanical compression joint through elastic plastics to achieve a sealing effect;

the existing cylindrical lithium ion battery has the defects of complex structure, various types of parts, multiple assembly procedures and high consistency control difficulty, the existing structure is that a winding core is connected with an upper cover through a lug to output current, the overcurrent capacity of the cylindrical battery is limited due to the limitation of space and the smaller size of the lug, and the connection impedance of the battery is increased, so that the battery is seriously heated, and the cylindrical battery is influenced by the structure, the radial heat transfer rate of the cylinder is slower than the axial heat transfer rate, so that heat is gathered in the winding core and cannot be transferred out, and a heating safety accident is caused; through the elastic plastic between shell and the apron, the deformation after the mechanical crimping keeps sealed, in course of working and use, and is extremely unstable, often leads to the weeping.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problems of providing a box-type large cylindrical battery cover plate structure, increasing the areas of a winding core and an output electrode of a cover plate, increasing the overcurrent capacity, reducing the leakage probability of a cylindrical battery and improving the quality.

In order to solve the technical problems, the utility model adopts the technical scheme that: the box-type large cylindrical battery cover plate structure comprises a roll core, a shell and a cover plate assembly which are coaxially arranged, wherein the shell is of a cylindrical structure with an opening at the upper end, the roll core extends downwards into the shell to form a sealing structure, the cover plate assembly is matched with the opening at the upper end of the shell to form a sealing structure and is fixed with the roll core, and the roll core outputs electricity to the outside through the cover plate;

the upper end of the shell is closed and the roll core is fixed through the roller groove, or the concave convex point arranged at the upper end of the shell positions the roll core;

the cover plate component is of a positive convex radian structure or an acicular pitted surface structure with convex points.

Furthermore, the shell upper end is closed up and the outside is equipped with the roller slot, and the roller slot corresponds the recess on the apron subassembly, and shell top diameter is less than original shell diameter, and the apron subassembly forms knot formula lid structure, detains on the shell and the two interference fit.

Furthermore, the shell and the cover plate component are welded through laser welding, the welding position is the side seam of the shell and the cover plate, or the top of the shell and the top of the cover plate component are welded through penetration, and the shell and the cover plate component form a sealed cavity through laser welding.

Further, the upper end of the shell is provided with a plurality of concave convex points, the convex points are in contact positioning with the roll core, the convex points at the upper end are in interference fit with the cover plate assembly, and the shell and the cover plate assembly are in a laser welding structure.

Furthermore, the cover plate component is of a forward convex arc structure, conductive adhesive is arranged between the cover plate component and the roll core to form a permanent stable conductive structure, and the conductive structure on the cover plate component and the top lug plane of the roll core are connected together through laser welding.

Furthermore, the cover plate assembly is of a needle-shaped pitted surface structure with salient points, and the salient points are pressed into the roll-shaped conductive plane through external force after the cover plate assembly is installed in place to form a multi-electric-shock structure.

Further, the cover plate assembly comprises a pole column, an upper sealing gasket, a battery cover, an insulating sealing element, a battery inner pole column, a lower sealing gasket and a copper rivet which are connected into a whole and form a sealing structure, wherein the battery inner pole column and the pole piece are electrically connected through conductive adhesive, and the copper rivet is connected with the pole column of the electric core for outputting externally to form an electric connection path for outputting externally.

Furthermore, the pole and the battery inner pole are made of aluminum alloy, and the copper rivet is made of T2 red copper.

Further, the insulating sealing member is made of modified plastics, including but not limited to polyphenylene oxide and polypropylene.

Compared with the prior art, the utility model has the following advantages and positive effects.

The shell and the cover plate are welded together through laser welding, so that the probability of electrolyte leakage can be greatly reduced; the core electrode lug is increased by more than 10 times compared with the original structure, and can be designed according to different charging and discharging requirements; the applicability is relatively wide, the heat of the battery can be effectively transferred, and the control of the external heat management effect is facilitated; the cooperation of apron subassembly and shell is fixed a position the installation through mechanical assembly mode, and the assembly is simple, efficient with high costs low, and battery manufacturing process is simpler, high-efficient.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:

FIG. 1 is an exploded view of a box-type large cylindrical battery cover plate structure according to the present invention;

FIG. 2 is an exploded view of the cover plate assembly of the present invention;

FIG. 3 is a half sectional view of a lid plate of a pouch-type large cylindrical battery of the present invention;

FIG. 4 is a cross-sectional view of the cover plate assembly of the present invention in a forward convex configuration;

FIG. 5 is a top view of the cover plate assembly of the present invention in a forward convex configuration;

FIG. 6 is a cross-sectional view of a needle-like pitted surface with raised points of the cover plate assembly of the present invention;

FIG. 7 is a top view of a bumped needle-like pitted surface of the cover plate assembly of the present invention;

fig. 8 is an assembly view of the housing of the present invention in a roll trough configuration.

Reference numerals:

1. a cover plate assembly; 11. a pole column; 12. an upper sealing gasket; 13. a battery cover; 14. an insulating seal; 15. an inner pole of the battery; 16. a lower seal gasket; 17. copper rivets; 2. a negative electrode insulation sheet; 3. a winding core; 31. a conductive adhesive; 4. an anode insulating sheet; 5. a housing; 51. and (4) a roller groove.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The following detailed description of specific embodiments of the utility model refers to the accompanying drawings.

As shown in fig. 1 to 8, the cassette large cylindrical battery cover plate structure positions the winding core 3 and the shell 5 by the shell 5 closing and roll groove method for the winding core structure without the tab, and the structure mode is divided into the following two types.

Mode 1: after roll core 3 is packed into to shell 5, carry out whole binding off, make 5 top diameters of shell be less than original 5 diameter unidimensional of shell, apron subassembly 1 external diameter is unanimous with 5 external diameters of shell, the internal diameter is unanimous with the external diameter of roll groove 51, apron subassembly 1 forms a knot formula lid structure, detain on shell 5, form certain tight fit, interference fit promptly, and correspond the top recess on the apron subassembly 1, laser welding welds at last, the side seam crossing of shell 5 and apron subassembly 1 can be selected to the welding position, also can select shell 5 and the top of apron subassembly 1 to pierce through the welding, make shell 5 and apron subassembly 1 form a seal chamber through the laser welding mode.

Mode 2: after the core 3 is rolled up in the packing into of

shell

5, 5 dashes out the bump structure of being interrupted, and bump structural action is firstly fixed a position to rolling up core 3, secondly forms the tight fit with U type apron subassembly 1, through the slope mode of U type apron subassembly 1, makes the installation accomplish back shroud subassembly 1 and shell 5 and forms certain fastening structure, interference fit promptly, carries out laser welding at shell 5 and the cooperation of U type apron subassembly 1 top to form a seal chamber.

The connection structure of the cover plate component 1 and the winding core 3 has two forms, 1: the connecting structure of the cover plate component 1 can be a positive convex arc structure, the connecting structure is stressed and deformed by the pressure after installation to form 80% effective area contact, and an elastic conductive adhesive 3131 is arranged between the cover plate and the winding core 3 to form a permanent stable conductive structure; in addition, the conductive structure on the cover plate component 1 and the lug plane at the top of the winding core 3 can be connected together in a laser welding mode; 2: the connecting structure on the cover plate component 1 can be a needle-shaped pitted surface with salient points, and when the cover plate component 1 is installed in place, the needle-shaped salient points are pressed into the roll-shaped conductive plane through external force to form a multi-electric-shock structure.

The battery internal pole 15 is electrically connected with the pole piece on the winding core 3 through the conductive adhesive 31, and is connected with the pole 11 externally output by the battery core through the copper rivet 17 to form an electric connection path for external output; the pole 11, the upper sealing gasket 12, the battery cover 13, the insulating sealing member 14, the battery inner pole 15 and the lower sealing gasket 16 form a sealing structure on the battery cover through a copper rivet 17. The battery internal pole 15 is electrically connected with the pole piece through conductive adhesive, and is connected with the pole 11 externally output by the battery core through a copper rivet 17 to form an electric connection path for external output; the pole 11, the upper sealing gasket 12, the welding part 13, the insulating sealing part 14, the battery inner pole 15 and the lower sealing gasket 16 form the battery cover plate component 1 with a sealing structure through the copper rivet 17. The pole 11 and the battery inner pole 15 are made of aluminum alloy, the copper rivet 17 is made of T2 red copper, and the three components have good conductive capacity and low internal resistance, so that the battery has good electrical property. The insulating sealing element 14 is made of modified plastic, the material is polyphenylene oxide, polypropylene ethylene and glass fiber in a blending modification mode, the modified plastic has low shrinkage rate, the structural shape of parts can be guaranteed, and good sealing performance with a battery shell opening is guaranteed; the modified material resists electrolyte corrosion, the performance of the material does not decay after being soaked in the electrolyte for a long time, and the service life cycle use requirement of the battery is ensured; meanwhile, the modified plastic can have good electrical insulation performance; the thermal deformation temperature of the modified material is 120-140 ℃, and the service temperature requirement of the service life cycle of the battery is met; meanwhile, the flame retardant grade of UL90-V0 is met, the explosion-proof valve can be opened in the early stage of thermal runaway, and when the gas production rate is increased along with the aggravation of the thermal runaway, the whole plastic part 14 is melted, and an exhaust channel is increased.

The assembling process comprises the steps of coating, winding, shaping of tabs, entering a shell, rolling a groove, adding a cover plate, rolling, sealing and welding, and injecting liquid to complete assembling.

In the whole structure, the shell and the cover plate are welded together by laser welding, so that the probability of electrolyte leakage can be greatly reduced; the core electrode lug is increased by more than 10 times compared with the original structure, and can be designed according to different charging and discharging requirements; the applicability is relatively wide, the heat of the battery can be effectively transferred, and the control of the external heat management effect is facilitated; the cooperation of apron subassembly and shell is fixed a position the installation through mechanical assembly mode, and the assembly is simple, efficient with high costs low, and battery manufacturing process is simpler, high-efficient.

While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the utility model. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.

Claims

1. Box-type big cylinder battery cover plate structure, its characterized in that: the winding core is of a cylindrical structure with an opening at the upper end, the winding core extends downwards into the shell, the cover plate component is matched with the opening at the upper end of the shell to form a sealing structure and is fixed with the winding core, and the winding core outputs electricity to the outside through the cover plate;

2. The cassette large cylindrical battery cover plate structure according to claim 1, characterized in that: the shell upper end binding off and the outside are equipped with the roller slot, and the roller slot corresponds the recess on the apron subassembly, and shell top diameter is less than original shell diameter, and the apron subassembly forms knot formula lid structure, detains on the shell and the two interference fit.

3. The cassette large cylindrical battery cover plate structure according to claim 2, characterized in that: the shell and the cover plate component are welded through laser welding, the welding position is the side seam of the shell and the cover plate, or the shell and the top of the cover plate component are welded through penetration, and the shell and the cover plate component form a sealed cavity through laser welding.

4. The cassette large cylindrical battery cover plate structure according to claim 1, characterized in that: the shell upper end sets up the bump of a plurality of indents, and the bump is to rolling up the core contact location, bump and apron subassembly interference fit of upper end, and the shell passes through laser welding structure as an organic whole with the apron subassembly.

5. The cassette large cylindrical battery cover plate structure according to claim 1, characterized in that: the cover plate component is of a forward convex arc structure, conductive adhesive is arranged between the cover plate component and the roll core to form a permanent stable conductive structure, and the conductive structure on the cover plate component and the top lug plane of the roll core are connected together through laser welding.

6. The cassette large cylindrical battery cover plate structure according to claim 1, characterized in that: the cover plate assembly is of a needle-shaped pitted surface structure with salient points, and the salient points are pressed into the roll-shaped conductive plane through external force after the cover plate assembly is installed in place to form a multi-electric-shock structure.

7. The cassette large cylindrical battery cover plate structure according to claim 1, characterized in that: the cover plate assembly comprises a pole column, an upper sealing gasket, a battery cover, an insulating sealing element, a battery inner pole column, a lower sealing gasket and a copper rivet which are connected into a whole and form a sealing structure, wherein the battery inner pole column and the pole piece form electric connection through conductive adhesive, and are connected with the pole column of the external output of the battery core through the copper rivet to form an electric connection path of the external output.

8. The lid plate structure of the box-type large-column battery according to claim 7, wherein: the pole and the battery inner pole are made of aluminum alloy, and the copper rivet is made of T2 red copper.