CN213845443U

CN213845443U - Composite diaphragm for winding type battery and winding type battery

Info

Publication number: CN213845443U
Application number: CN202021667212.2U
Authority: CN
Inventors: 赵梁栋; 王明煜; 徐松
Original assignee: Henan Chaoli New Energy Co ltd
Current assignee: Henan Chaoli New Energy Co ltd
Priority date: 2020-08-11
Filing date: 2020-08-11
Publication date: 2021-07-30
Anticipated expiration: 2030-08-11

Abstract

The utility model relates to a coiling formula battery is with compound diaphragm and coiling formula battery belongs to battery technical field. The utility model discloses a coiling formula is composite diaphragm for battery, including the diaphragm, the one end of diaphragm bonds there is the conductive foil material, the conductive foil material is metal foil material or graphite film or graphite alkene film. The utility model discloses a coiling formula is composite diaphragm for battery bonds in diaphragm one end and sets up electrically conductive foil, when preparing coiling formula battery, can make electrically conductive foil be in the outmost of electric core, utilizes electrically conductive foil to avoid ion and metal casing reaction on the negative pole piece on the one hand, and on the other hand can also protect the electrode material layer on the pole piece of laminating mutually with it and be difficult for droing. Moreover, when the winding type battery is processed, the composite diaphragm is convenient for the diaphragm and the conductive foil to be positioned.

Description

Composite diaphragm for winding type battery and winding type battery

Technical Field

The utility model relates to a coiling formula battery is with compound diaphragm and coiling formula battery belongs to battery technical field.

Background

The winding type cylindrical battery has an irreplaceable position in the battery market due to the unique shape and the highly mature manufacturing process, particularly, in the fields of civil consumer batteries and batteries for electric tools, the cylindrical winding type secondary battery occupies an important position in the market for a long time due to the unique advantages of the cylindrical winding type secondary battery, the battery core of the winding type battery sequentially comprises a pole piece (a positive pole piece or a negative pole piece), a diaphragm, a pole piece (a negative pole piece or a positive pole piece) and the diaphragm from inside to outside, and the stability of the battery core is high.

Wound cells typically employ a metal casing, such as a steel can. When the battery is designed, the negative plate is usually positioned on the outer side of the battery core, and the positive plate is positioned on the inner side of the negative plate. At this time, in order to avoid the reaction between the negative electrode material on the negative electrode sheet and the metal material of the battery case, a layer of separator is usually wound outside the battery cell. However, the porous structure of the membrane easily causes part of the ions to pass through the membrane to react with the metal shell.

SUMMERY OF THE UTILITY MODEL

The utility model provides a coiling formula battery is with compound diaphragm and coiling formula battery can reduce the ion on the negative pole piece and battery metal casing reaction.

The utility model adopts the technical scheme as follows:

the utility model provides a coiling formula is compound diaphragm for battery, includes the diaphragm, the one end bonding of diaphragm has the conductive foil material, the conductive foil material is metal foil material or graphite film or graphene film.

The diaphragm is provided with the sticky tape with the electrically conductive foil that corresponds the side of the tip that is close to each other, sticky tape one end bonds with the corresponding side that the diaphragm is close to the one end of electrically conductive foil, and the other end bonds with the corresponding side that the electrically conductive foil is close to the one end of diaphragm.

The diaphragm is provided with the binder layer with the side that corresponds of the tip that electrically conductive foil is close to each other, the one end of binder layer bonds with the side that corresponds that the diaphragm is close to the one end of electrically conductive foil, and the other end bonds with the side that corresponds that the electrically conductive foil is close to the one end of diaphragm, and the binder layer is kept away from the surface bonding of one side of diaphragm and is had the diaphragm material layer.

The terminal surface mutual butt of the corresponding tip of diaphragm and electrically conductive foil, the side that is close to the sticky tape of the one end that the diaphragm is close to electrically conductive foil and the side parallel and level that is close to the sticky tape of the one end that electrically conductive foil is close to the diaphragm.

The corresponding ends of the diaphragm and the conductive foil are mutually lapped.

The diaphragm is lapped with the corresponding end part of the conductive foil, and a binder layer is arranged between the lapped end parts of the diaphragm and the conductive foil.

The diaphragm is a single-layer diaphragm, a multi-layer co-extrusion diaphragm or a multi-layer composite diaphragm.

The utility model provides a coiling type battery, includes casing and the coiling type electricity core of setting in the casing, coiling type electricity core includes positive plate, negative pole piece, diaphragm, the diaphragm is above-mentioned arbitrary compound diaphragm, electrically conductive foil is located the outmost of coiling type electricity core.

The length of the conductive foil is larger than the perimeter of the winding type battery cell.

The coiled battery is a zinc-nickel secondary battery or a zinc-manganese secondary battery.

The utility model discloses a coiling formula is composite diaphragm for battery bonds in diaphragm one end and sets up electrically conductive foil, when preparing coiling formula battery, can make electrically conductive foil be in the outmost of electric core, utilizes electrically conductive foil to avoid ion and metal casing reaction on the negative pole piece on the one hand, and on the other hand can also protect the electrode material layer on the pole piece of laminating mutually with it and be difficult for droing. Moreover, when the winding type battery is processed, the composite diaphragm is convenient for the diaphragm and the conductive foil to be positioned.

Drawings

Fig. 1 is a schematic perspective view of a composite separator according to example 1;

FIG. 2 is a side view of the composite diaphragm of example 1;

fig. 3 is a schematic structural diagram of a cell of a wound battery according to embodiment 7.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects solved by the present invention easier to understand, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

Example 1

As shown in fig. 1-2, the composite diaphragm of the present embodiment includes a diaphragm 1, and one end of the diaphragm is connected to a conductive foil 2, which is a metal foil. Specifically, the thickness of the diaphragm is larger than that of the metal foil, and one end of the metal foil close to the diaphragm is abutted with one end of the diaphragm close to the metal foil. The end face of the metal foil at the end close to the diaphragm is perpendicular to the side surface of the metal foil, and the end face of the diaphragm at the end close to the metal foil is perpendicular to the side surface of the diaphragm. The end face of one end of the metal foil close to the diaphragm is attached to the end face of one end of the diaphragm close to the metal foil.

One surface (e.g., the upper surface) of the metal foil near the end of the separator is flush with one surface (the upper surface) of the separator near the end of the metal foil, and an adhesive tape 3 is attached to the flush surfaces. Specifically, one end of the adhesive tape is attached to the corresponding surface of one end of the corresponding metal foil, and the other end of the adhesive tape is attached to the corresponding surface of the diaphragm.

The diaphragm can be a single-layer diaphragm, a multi-layer co-extrusion diaphragm or a multi-layer composite diaphragm. Specifically, the single-layer diaphragm is a PP diaphragm, a PE diaphragm or a cellulose diaphragm, the multi-layer co-extrusion diaphragm is a PP-PE-PP co-extrusion diaphragm, and the multi-layer composite diaphragm is a PP-PE double-layer composite diaphragm, a PP-PE-PP three-layer composite diaphragm, a non-woven fabric-PP film three-layer composite film or a PP film-non-woven fabric-PP film three-layer composite film. The non-woven fabric is PP non-woven fabric, PE non-woven fabric or cellulose non-woven fabric, and the diaphragm can also be directly single-layer non-woven fabric, such as PP non-woven fabric or cellulose non-woven fabric.

The metal foil is a steel foil, a copper foil or a tin foil, and can also be a tinned copper foil, a copper-plated steel foil, a tinned steel foil or a copper-plated tinned steel foil, wherein the copper-plated tinned steel foil is formed by plating copper on one surface and plating tin on the other surface of the steel foil.

The tin-plated copper foil is obtained by plating tin on one surface or two surfaces of copper foil, and the obtained tin-plated copper foil comprises a copper layer and a tin layer coated on one surface or two surfaces of the copper layer. Accordingly, the other copper-plated steel foil, tin-plated steel foil, and copper-plated tin-plated steel foil have a structure similar to that of tin-plated copper foil.

The thicknesses of the diaphragm, the conductive foil and the adhesive tape can be selected according to requirements, preferably, the thickness of a single-layer diaphragm is 6 micrometers to 60 micrometers, the thickness of a multi-layer diaphragm is 30 micrometers to 1000 micrometers, the thickness of the conductive foil is 6 micrometers to 60 micrometers, and the thickness of the adhesive tape is 6 micrometers to 100 micrometers.

Example 2

This embodiment is different from embodiment 1 in that the thickness of the separator is equal to that of the metal foil.

Example 3

This embodiment differs from embodiment 1 in that the adhesive tape may be replaced with an adhesive layer and a separator layer bonded together, that is, an adhesive layer is provided on one side of the separator near one end of the metal foil and on the corresponding side of the metal foil near one end of the separator, a separator layer is provided on a surface of the adhesive layer remote from the separator and the metal foil, and a separator layer is bonded on a surface of the adhesive layer.

Example 4

This embodiment is different from embodiment 1 in that one end of the separator close to the metal foil is lapped on the metal foil, and an adhesive tape is adhered to the surface of the lapping portion, and the adhesive tape is still adhered to the side surface of one end of the separator at one end and the side surface of one end of the metal foil at the other end. In the overlapping portion, the adhesive tape, the separator, and the metal foil may be arranged in this order or in the direction from one side of the separator to the other side.

Example 5

This embodiment is different from embodiment 1 in that the separator is bonded to the corresponding end portion of the metal foil, that is, an adhesive layer is provided between the surface of the separator on the side close to the metal foil at the end close to the metal foil and the surface of the metal foil on the side close to the separator at the end close to the separator, so that the separator and the corresponding end portion of the metal foil are bonded together without using an adhesive tape.

Example 6

The present embodiment is different from embodiment 1 in that the conductive foil is a graphite film or a graphene film.

The copper foil can tightly wrap the whole outer ring, so that the contact between the zinc cathode and the steel shell is avoided, and the penetration of zinc ions and the reaction of the steel shell are prevented.

Example 7

As shown in fig. 3, the winding battery of the present embodiment is a winding zinc-nickel battery, and includes a cylindrical casing, a battery cell disposed in the casing, and an electrolyte, where the battery cell is a cylindrical winding battery cell. The battery core is formed by winding a positive plate 4, a negative plate 5 and a diaphragm, wherein the positive plate comprises a positive current collector and a positive material layer coated on two surfaces of the positive current collector, and the negative plate comprises a negative current collector and a negative material layer coated on two surfaces of the negative current collector. The separator was the composite separator in example 1 above.

Specifically, the composite diaphragm including the diaphragm and the metal foil is folded in half from the middle to form two diaphragm ends. And then clamping the negative plate in the middle of the folded diaphragm, and then overlapping a positive plate on the outer surface of the diaphragm on one side of the negative plate, wherein the diaphragm attached to the positive plate is the diaphragm end which is not connected with the metal foil. And then sequentially winding the positive plate, the diaphragm, the negative plate and the diaphragm from inside to outside to form the battery cell. In the electric core that makes, be in the outmost metal foil that is, metal foil is greater than the girth of electric core along the length direction's of diaphragm length ascending length for metal foil can wrap up electric core (the electric core that does not contain metal foil) completely a week. The outermost end of the negative plate is tightly attached to the inner surface of the metal foil, the inner surface of the negative plate is tightly attached with a diaphragm (the diaphragm end which is not connected with the metal foil), and the inner surface of the diaphragm end which is not connected with the metal foil is tightly attached with a positive plate. At this time, in the battery core, the adhesive tape at the joint of the diaphragm and the metal foil of the composite diaphragm may be located on the outer side or on the inner side.

Examples 8 to 12 differ from example 7 in that the composite separators of examples 2 to 6 were used, respectively.

Claims

1. A composite diaphragm for a coiled battery comprises a diaphragm and is characterized in that one end of the diaphragm is bonded with a conductive foil, and the conductive foil is a metal foil or a graphite film or a graphene film;

2. The composite separator for a wound battery according to claim 1, wherein the separator and the conductive foil are provided with adhesive layers on the sides corresponding to the ends close to each other, one end of each adhesive layer is bonded to the corresponding side of the separator close to the end of the conductive foil, the other end of each adhesive layer is bonded to the corresponding side of the conductive foil close to the end of the separator, and the surface of the adhesive layer away from the separator is bonded with the separator material layer.

3. The composite separator for a wound battery according to claim 2, wherein the end faces of the separator and the corresponding end portions of the conductive foil abut against each other, and the side face of the separator near the tape at the end of the conductive foil is flush with the side face of the conductive foil near the tape at the end of the separator.

4. A composite separator for a rolled battery as defined in claim 2, wherein the corresponding ends of the separator and the conductive foil are overlapped with each other.

5. The composite separator for a wound battery according to claim 1, wherein the ends of the separator corresponding to the conductive foil are overlapped with each other, and an adhesive layer is provided between the overlapped ends of the separator and the conductive foil.

6. The composite separator for a rolled battery according to claim 1, wherein the separator is a single-layer separator, a multi-layer co-extruded separator, or a multi-layer composite separator.

7. The utility model provides a coiling type battery, includes casing and the coiling type electric core of setting in the casing, coiling type electric core includes positive plate, negative pole piece, coiling type battery and uses compound diaphragm, and coiling type battery includes the diaphragm with compound diaphragm, the one end of diaphragm bonds there is the electrically conductive foil material, the electrically conductive foil material is metal foil material or graphite film or graphite alkene film, the electrically conductive foil material is located the outmost of coiling type electric core.

8. A wound battery according to claim 7, wherein the conductive foil has a length greater than the circumference of the wound cell.

9. A jelly-roll battery according to claim 7, wherein the jelly-roll battery is a zinc-nickel secondary battery or a zinc-manganese secondary battery.