CN216213627U

CN216213627U - Thin battery

Info

Publication number: CN216213627U
Application number: CN202122731233.7U
Authority: CN
Inventors: 谢庆富; 徐志锋; 真义超; 刘国镇; 陈裕敏; 周旭
Original assignee: Shenzhen Jingfu Technology Co ltd
Current assignee: Shenzhen Jingfu Technology Co ltd
Priority date: 2021-11-09
Filing date: 2021-11-09
Publication date: 2022-04-05
Anticipated expiration: 2031-11-09

Abstract

The utility model provides a thin battery, which comprises a lower packaging layer and an upper packaging layer which are oppositely arranged, wherein a positive collector electrode layer is laid on the upper surface of the lower packaging layer; a cathode collector layer is laid on the lower surface of the upper packaging layer; the battery diaphragm separates positive collector electrode layer and negative collector electrode layer and establishes and follow go up the encapsulation layer with the horizontal wave setting that is of encapsulation layer down, the battery diaphragm with positive collector electrode layer with negative collector electrode layer all does not contradict, positive collector electrode layer with be equipped with the positive pole between the battery diaphragm, negative collector electrode layer with be equipped with the negative pole between the battery diaphragm, positive pole with the negative pole is in go up the encapsulation layer with horizontal edge of encapsulation layer is around the battery diaphragm sets up in turn. The utility model achieves the purpose of improving the battery performance by increasing the contact interfaces between the anode and the battery diaphragm and between the cathode and the battery diaphragm in the unit volume of the battery.

Description

Thin battery

Technical Field

The utility model relates to the field of batteries, in particular to a thin battery.

Background

Traditional thin battery adopts the stacked structure usually, piles up the form in proper order by first substrate layer/first mass flow body/anodal diaphragm/negative pole/second substrate layer, the negative pole can directly select for use the zinc foil, also can select for use the stacked structure of "zinciferous negative pole thick liquids layer/second collecting electrode", thin battery still includes anodal utmost point ear and negative pole utmost point ear, just, negative pole utmost point ear is the strip usually, the one end of anodal utmost point ear with anodal collecting electrode fixed connection, the other end extend to the outside of first substrate layer is used for being connected with the anodal electricity of power consumption utensil, the one end of negative pole utmost point ear with zinc foil or second collecting electrode fixed connection, the other end extend to the outside of second substrate layer is used for being connected with the negative pole electricity of power consumption utensil.

The positive pole and the negative pole of current thin battery are the plate structure, just anodal orientation diaphragm one side with the negative pole towards the diaphragm one side all is the plane, the diaphragm tiling clamp is located the positive pole with play the effect of keeping apart just, the negative pole avoids the short circuit between the negative pole. Electrolyte is filled among the positive electrode, the diaphragm and the negative electrode in the battery, the electrolyte is a carrier for ion transmission during electrochemical reaction, and the diaphragm generally has good electrolyte absorption capacity, so that the diaphragm can maintain necessary electrolyte during electrochemical reaction, and an ion transmission channel is formed between the positive electrode and the negative electrode.

At present, the means for improving the performance of the battery are mostly focused on the optimization of the formulas and the manufacturing processes of the positive electrode, the negative electrode and the electrolyte. However, these optimization methods have limited improvement in battery performance. With the rapid development of the electronic product industry, higher and higher requirements are put forward on the performance of the battery, and particularly, the thin battery is not suitable for electric appliances with larger current due to smaller volume and smaller discharge current, so that the improvement of the performance (such as discharge current) of the battery is particularly important.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a thin battery, which achieves the aim of improving the battery performance by increasing the contact interface between a positive electrode and a battery diaphragm and between a negative electrode and the battery diaphragm in a unit volume battery.

A thin battery comprises a lower packaging layer and an upper packaging layer which are oppositely arranged, wherein a positive collector electrode layer is laid on the upper surface of the lower packaging layer, and a positive electrode is laid on the upper surface of the positive collector electrode layer; a negative collector layer is laid on the lower surface of the upper packaging layer, and a negative electrode is laid on the lower surface of the negative collector layer; the battery diaphragm separates positive collector electrode layer and negative collector electrode layer and establishes and follow go up the encapsulation layer with the horizontal wave setting that is of encapsulation layer down, the battery diaphragm with positive collector electrode layer with negative collector electrode layer all does not contradict, positive collector electrode layer with be equipped with the positive pole between the battery diaphragm, negative collector electrode layer with be equipped with the negative pole between the battery diaphragm, positive pole with the negative pole is in go up the encapsulation layer with horizontal edge of encapsulation layer is around the battery diaphragm sets up in turn.

The thin battery increases the contact interface between the positive electrode and the battery diaphragm and between the negative electrode and the battery diaphragm in the unit volume of the battery, improves the load capacity and the discharge performance of the battery, and is beneficial to improving the performance of the battery.

Preferably, the positive electrode fills a space between the battery separator and the positive electrode collector layer.

Preferably, the positive electrode is a one-piece type, and the positive electrode is composed of a positive electrode body and at least one positive electrode protruding part formed by upwards extending the positive electrode body. Furthermore, the number of the positive electrode convex parts is more than or equal to 2, and the positive electrode convex parts are mutually parallel and are uniformly distributed at intervals.

Preferably, the negative electrode fills a space between the battery separator and the negative electrode collector layer.

Preferably, the negative electrode is a one-piece type, and the negative electrode is composed of a negative electrode body and at least one negative electrode protruding part formed by extending the negative electrode body downwards. Furthermore, the number of the negative electrode protruding parts is more than or equal to 2, and the negative electrode protruding parts are mutually parallel and are uniformly distributed at intervals.

Preferably, the battery diaphragm is in a sine wave shape, a square wave shape, a triangular wave shape or the like.

The thin battery further comprises a positive electrode lug, one end of the positive electrode lug is fixedly connected with the positive electrode collector layer, and the other end of the positive electrode lug extends out of the lower packaging layer. Preferably, the positive electrode tab is a metal sheet, and the positive electrode tab and the wet positive electrode collector layer are directly contacted face to face for adhesion and fixation. The positive electrode lug of the metal sheet is adopted to replace the existing carbonaceous positive electrode lug (the positive electrode lug extends outwards from the positive electrode collector layer to the outside of the lower packaging layer to serve as the carbonaceous positive electrode lug), the positive electrode lug can bear larger drawing force, and meanwhile, the connection mode of the positive electrode lug and an external circuit is more (such as conductive adhesive, riveting, welding and the like); the positive electrode tab is directly contacted with the wet positive electrode collector layer in a face-to-face manner for pasting and fixing, the positive electrode tab is directly attached to the positive electrode collector layer in a face-to-face manner, the positive electrode tab is tightly attached to the positive electrode collector layer, contact resistance is low, and battery performance is improved; meanwhile, the problems of unstable contact impedance, difficult welding and low connection efficiency with an electric appliance caused by riveting do not exist.

The thin battery further comprises a negative electrode lug, one end of the negative electrode lug is fixedly connected with the negative electrode collector layer, and the other end of the negative electrode lug extends out of the upper packaging layer. Furthermore, the negative electrode tab is a metal sheet, and the negative electrode tab is directly contacted with the wet negative electrode collector layer in a face-to-face manner to be pasted and fixed. The utility model adopts the negative pole lug of the metal sheet to replace the prior carbonaceous negative pole lug (the negative pole lug extends outwards from the negative pole collector layer to the outside of the upper packaging layer to be taken as the carbonaceous negative pole lug), the negative pole lug can bear larger drawing force, and meanwhile, the connection mode of the negative pole lug and an external circuit is more; moreover, the negative electrode tab and the negative electrode collector layer are tightly attached, so that the contact impedance is low, and the battery performance is improved; meanwhile, the problems of unstable contact impedance, difficult welding and low connection efficiency with an electric appliance caused by riveting do not exist.

And the lower packaging layer is bonded and sealed with the upper packaging layer through a cementing layer. Preferably, the positive collector layer and the positive electrode tab are clamped between the cementing layer and the upper packaging layer, and the positive electrode tab is not easy to tear off. Preferably, the negative collector layer and the negative electrode tab are clamped between the cementing layer and the upper packaging layer, and the negative electrode tab is not easy to tear off.

In the specific implementation process, the lower packaging layer and the upper packaging layer are both made of a PET film, a PVC film, a PE film or a composite film. The positive collector layer and the negative collector layer are both carbon slurry layers or silver slurry layers or carbon-containing mixed slurry layers. The positive electrode lug and the negative electrode lug are both made of aluminum foil, nickel foil or copper foil. The battery diaphragm adopts coated paper or a porous polymer film and the like.

Drawings

Fig. 1 is a schematic sectional structure view of a thin battery of the present invention.

Detailed Description

The preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings:

as shown in fig. 1, a thin battery includes a lower packaging layer 10 and an upper packaging layer 20 which are oppositely arranged, an anode collector layer 30 is laid on the upper surface of the lower packaging layer 20, and an anode 40 is further laid on the upper surface of the anode collector layer 30; a negative collector layer 50 is laid on the lower surface of the upper packaging layer 20, and a negative electrode 60 is further laid on the lower surface of the negative collector layer 50; a battery diaphragm 70 separates the positive collector layer 30 from the negative collector layer 50 and is arranged along the transverse direction of the upper packaging layer 10 and the lower packaging layer 20 in a wave shape, the battery diaphragm 70 is not interfered with the positive collector layer 30 and the negative collector layer 50, a positive electrode 40 is arranged between the positive collector layer 30 and the battery diaphragm 70, a negative electrode 60 is arranged between the negative collector layer 50 and the battery diaphragm 70, and the positive electrode 40 and the negative electrode 60 are arranged along the battery diaphragm 70 in a left-right alternating manner on the transverse direction of the upper packaging layer 10 and the lower packaging layer 20.

The thin battery of the utility model increases the contact interface between the anode 40 and the battery diaphragm 70 and between the cathode 60 and the battery diaphragm 70 in the unit volume battery, improves the battery load capacity and the battery discharge performance, and is beneficial to improving the battery performance.

Preferably, as shown in fig. 1, the positive electrode 40 fills the space between the battery separator 70 and the positive electrode collector layer 30.

Preferably, as shown in fig. 1, the positive electrode 40 is a single piece, and the positive electrode 40 is composed of a positive electrode body 41 and at least one positive electrode protruding part 42 formed by extending the positive electrode body 41 upward. Further, as shown in fig. 1, the number of the positive electrode protrusions 42 is greater than or equal to 2, and the positive electrode protrusions 42 are parallel to each other and are uniformly distributed at intervals.

Preferably, as shown in fig. 1, the negative electrode 60 fills the space between the battery separator 70 and the negative electrode collector layer 50.

Preferably, as shown in fig. 1, the negative electrode 60 is a single piece, and the negative electrode 60 is composed of a negative electrode body 61 and at least one negative electrode protrusion 62 formed by extending the negative electrode body 61 downward. Furthermore, the number of the negative electrode convex parts 62 is more than or equal to 2, and the negative electrode convex parts 62 are mutually parallel and are uniformly distributed at intervals.

As shown in fig. 1, the thin battery further includes a positive electrode tab 80, one end of the positive electrode tab 80 is fixedly connected to the positive electrode collector layer 30, and the other end of the positive electrode tab 80 extends out of the lower packaging layer 10. Of course, the present invention can also be used as the positive electrode tab 80 extending from the positive electrode collector layer 30 to the outside of the lower package layer 10. Preferably, as shown in fig. 1, the positive electrode tab 80 is a metal sheet, and the positive electrode tab 80 and the wet positive electrode collector layer 30 are directly bonded and fixed in face-to-face contact. During manufacturing, a wet positive collector layer 30 (also called as a "conductive slurry layer") is printed on the upper surface of the lower packaging layer 10, then, when the positive collector layer 30 is in a wet state, the positive tab 80 is placed on the positive collector layer 30, one surface of the positive collector layer 30 is attached to the lower packaging layer 10 by virtue of the adhesive force of the wet positive collector layer 30, the other surface of the positive collector layer 30 is uniformly bonded with the positive tab 80, and then drying and curing are performed, so that the lower packaging layer 10, the positive collector layer 30 and the positive tab 80 are uniformly and firmly fixed and bonded together. Meanwhile, a segment of the positive electrode tab 80 that does not overlap with the positive electrode collector layer 30 extends outward to the outside of the lower encapsulation layer 10 and is used for circuit connection with an electrical appliance. The applicant tested the connection firmness of the positive electrode tab 80 by grasping the outer end of the positive electrode tab 80 by hand and horizontally pulling the positive electrode tab 80 outward, and found that: even if the outer end of the positive electrode tab 80 is pulled apart, the segment 81 of the positive electrode tab that overlaps the positive electrode collector layer 30 is still firmly connected to the positive electrode collector layer 30. Of course, the positive electrode tab 80 of the present invention can also be fixedly connected to the positive electrode collector layer 30 by means of conductive adhesive or riveting.

As shown in fig. 1, the thin battery further includes a negative electrode tab 90, one end of the negative electrode tab 90 is fixedly connected to the negative electrode collector layer 50, and the other end of the negative electrode tab 90 extends out of the upper packaging layer 20. Of course, the present invention can also be used as the negative electrode tab 90 extending from the negative electrode collector layer 50 to the outside of the upper packaging layer 20. Further, as shown in fig. 1, the negative electrode tab 90 is a metal sheet, and the negative electrode tab 90 and the wet negative electrode collector layer 50 are directly contacted with each other in a face-to-face manner for fixation. The applicant tested the firmness of connection of the negative electrode tab 90 by grasping the outer end of the negative electrode tab 90 by hand and pulling the negative electrode tab 90 horizontally outward, and found that: even if the outer end of the negative electrode tab 90 is pulled and broken, the segment 91 of the negative electrode tab that overlaps the negative electrode collector layer 50 is still firmly connected to the negative electrode collector layer 50. Of course, the negative electrode tab 90 of the present invention can also be fixedly connected to the negative electrode collector layer 50 by means of conductive adhesive or riveting.

As shown in fig. 1, the lower and upper sealing layers 10 and 20 are bonded and sealed by a bonding layer 100. Preferably, as shown in fig. 1, the positive collector layer 50 and the positive tab 80 are sandwiched between the glue layer 100 and the upper package layer 10, and the positive tab 80 is not easily torn off. Preferably, as shown in fig. 1, the negative collector layer 50 and the negative tab 90 are sandwiched between the glue layer 100 and the upper packaging layer 20, and the negative tab 90 is not easily torn off. Of course, the positive electrode tab 80 and the negative electrode tab 90 may be located outside the glue layer 100, and at this time, the positive electrode tab 80 and the negative electrode tab 90 have a large pulling force, but are easily torn off.

In a specific implementation process, the lower encapsulation layer 10 and the upper encapsulation layer 20 both adopt a PET film, a PVC film, a PE film or a composite film. The positive collector layer 30 and the negative collector layer 50 both use a carbon paste layer or a silver paste layer or a carbon-containing mixed paste layer. The positive electrode tab 80 and the negative electrode tab 90 are both made of aluminum foil, nickel foil or copper foil. The battery separator 70 is made of coated paper or a porous polymer film.

Claims

1. A thin battery comprises a lower packaging layer and an upper packaging layer which are oppositely arranged, wherein a positive collector electrode layer is laid on the upper surface of the lower packaging layer; a cathode collector layer is laid on the lower surface of the upper packaging layer; the method is characterized in that: the battery diaphragm separates positive collector electrode layer and negative collector electrode layer and establishes and follow go up the encapsulation layer with the horizontal wave setting that is of encapsulation layer down, the battery diaphragm with positive collector electrode layer with negative collector electrode layer all does not contradict, positive collector electrode layer with be equipped with the positive pole between the battery diaphragm, negative collector electrode layer with be equipped with the negative pole between the battery diaphragm, positive pole with the negative pole is in go up the encapsulation layer with horizontal edge of encapsulation layer is around the battery diaphragm sets up in turn.

2. A thin battery as defined in claim 1, wherein: the positive electrode fills a space between the battery separator and the positive electrode collector layer.

3. A thin battery as defined in claim 1, wherein: the positive pole is a piece, and the positive pole is composed of a positive pole body and at least one positive pole protruding part formed by upwards extending the positive pole body.

4. A thin battery as defined in claim 3, wherein: the number of the positive electrode convex parts is more than or equal to 2, and the positive electrode convex parts are mutually parallel and are uniformly distributed at intervals.

5. A thin battery as defined in claim 1, wherein: the negative electrode fills a space between the battery separator and the negative electrode collector layer.

6. A thin battery as defined in claim 1, wherein: the negative electrode is in a piece type and consists of a negative electrode body and at least one negative electrode lug boss formed by downwards extending the negative electrode body.

7. A thin battery as defined in claim 6, wherein: the number of the negative electrode protruding parts is more than or equal to 2, and the negative electrode protruding parts are mutually parallel and are uniformly distributed at intervals.

8. A thin battery as defined in claim 1, wherein: the battery diaphragm is in a sine wave shape, a square wave shape or a triangular wave shape.

9. A thin battery as defined in claim 1, wherein: the thin battery also comprises a positive electrode lug and a negative electrode lug, wherein one end of the positive electrode lug is fixedly connected with the positive electrode collector layer, and the other end of the positive electrode lug extends out of the lower packaging layer; the positive electrode lug is a metal sheet, and the positive electrode lug is directly contacted with the wet positive electrode collector layer in a face-to-face manner to be pasted and fixed; one end of the negative electrode tab is fixedly connected with the negative electrode collector layer, and the other end of the negative electrode tab extends out of the upper packaging layer; the negative electrode tab is a metal sheet, and the negative electrode tab is directly contacted with the wet negative electrode collector layer in a face-to-face manner to be pasted and fixed.

10. A thin battery as defined in claim 9, wherein: the lower packaging layer is bonded and sealed through a cementing layer between the upper packaging layers, the positive collector electrode layer and the positive pole lug are clamped between the cementing layer and the upper packaging layers, and the negative collector electrode layer and the negative pole lug are also clamped between the cementing layer and the upper packaging layers.