CN212113882U

CN212113882U - Battery pole piece and battery

Info

Publication number: CN212113882U
Application number: CN202021235563.6U
Authority: CN
Inventors: 李瑞杰; 王磊; 黄海强; 陈少杰; 周龙捷
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2020-06-29
Filing date: 2020-06-29
Publication date: 2020-12-08
Anticipated expiration: 2030-06-29

Abstract

The utility model relates to a battery technology field discloses a battery pole piece and battery, battery pole piece include the first mass flow body and set up in the first electrode material layer of the first mass flow body, battery pole piece still including set up in the intraformational protection part of first electrode material, protection part set up to supply can with the burr of the second mass flow body of the pole piece of battery pole piece opposition inserts. This battery pole piece has the burr male guard portion of the second mass flow body that supplies the pole piece that can oppose with battery pole piece, and the burr on the second mass flow body of pole piece can not the disect insertion first electrode material layer, greatly reduced the risk that the short circuit appears in the battery. Through set up above-mentioned battery pole piece in the battery, reducible battery inserts the short circuit phenomenon that negative material layer arouses because of the burr on the anodal mass flow body, has improved the safety in utilization of battery.

Description

Battery pole piece and battery

Technical Field

The utility model relates to a battery technology field specifically relates to a battery pole piece and battery.

Background

The battery pole piece is an important component of the battery. Taking a solid-state battery as an example, the solid-state battery is a battery using a solid electrode and a solid electrolyte, the solid electrolyte is used for separating the positive electrode and the negative electrode of the battery, burrs are easily generated at the edges of a pole piece in the cutting process, and the burrs easily pierce the solid electrolyte, so that the short circuit of the battery is caused. At present, the edge of the current collector of the battery pole piece is mainly provided with a frame to prevent the piercing of burrs.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a battery pole piece, this battery pole piece have the burr male protection portion of the second mass flow body that supplies the pole piece that can oppose with battery pole piece.

In order to achieve the above object, the present invention provides a battery pole piece, the battery pole piece includes the first mass flow body and set up in the first electrode material layer of the first mass flow body, the battery pole piece is still including set up in the intraformational guard portion of first electrode material, the guard portion set up to supply can with the burr of the second mass flow body of the pole piece that the battery pole piece is oppositional inserts.

Above-mentioned technical scheme is through setting up the guard portion in first electrode material layer to can supply to insert with the burr of the second mass flow body of the pole piece that the battery pole piece is relative, from this, burr on the second mass flow body of pole piece can not the disect insertion first electrode material layer, greatly reduced the risk that the short circuit appears in the battery.

Preferably, a first surface of the first electrode material layer facing away from the first current collector is provided with a groove capable of accommodating the protective part.

Preferably, the groove has a ring shape, the protector has a ring shape, and the protector is fitted with the groove.

Preferably, the protective part is an electrolyte body.

Preferably, the battery pole piece comprises an electrolyte layer covering the first electrode material layer.

Preferably, the electrolyte layer and the guard are formed as an integral structure; and/or

The electrolyte layer extends beyond the first electrode material layer.

Preferably, the area of the guard defined in the width direction of the guard is for the projection of the respective edge portion of the pole piece to fall into.

Preferably, the groove width of the groove is 0.01mm-3 mm.

Preferably, the battery pole piece is a negative pole piece, and the pole piece is a positive pole piece; and/or

The edges of the battery pole pieces extend beyond the edges of the pole pieces.

The utility model discloses the second aspect provides a battery, be provided with in the battery the utility model provides a battery pole piece. Through setting up in the battery the utility model provides a battery pole piece, reducible battery inserts the short circuit phenomenon that the negative material layer arouses because of the burr on the anodal mass flow body, has improved the safety in utilization of battery.

Drawings

FIG. 1 is a schematic cross-sectional view of a battery assembled by battery pole pieces according to a preferred embodiment of the present invention;

fig. 2a to fig. 2e are schematic diagrams of a process for preparing a battery according to a preferred embodiment of the present invention.

Description of the reference numerals

10-a battery pole piece; 12-a first current collector; 14-a first electrode material layer; 140-a groove; 16-a guard; 18-an electrolyte layer; 20-pole piece; 22-a second current collector; 24-a layer of a second electrode material; 40 a-a first tab; 40 b-a second tab; 60-battery.

Detailed Description

In the present invention, the use of directional terms such as "upper, lower, left and right" in the absence of a contrary explanation generally means that the directions shown in the drawings and the practical application are understood, and "inner and outer" mean inner and outer of the outline of the component.

The utility model provides a battery pole piece, as shown in fig. 1, battery pole piece 10 includes first mass flow body 12 and sets up in the first electrode material layer 14 of first mass flow body 12, and battery pole piece 10 is still including setting up the protection portion 16 in first electrode material layer 14, and protection portion 16 sets up to supply and inserts with the burr of the second mass flow body 22 of the pole piece 20 that battery pole piece 10 was just relative. By providing the guard portion 16 in the first electrode material layer 14, the burr of the second current collector 22 of the pole piece 20 opposite to the battery pole piece 10 can be inserted, and thus the burr on the second current collector 22 of the pole piece 20 cannot be directly inserted into the first electrode material layer 14, so that the risk of short circuit of the battery 60 is greatly reduced. The material of the protective part 16 may be selected according to actual requirements as long as the performance of the battery 60 is not affected, and preferably, the protective part 16 may be an electrolyte body, that is, the protective part 16 may be made of an electrolyte material, and further preferably, the protective part 16 may be an inorganic solid electrolyte body, that is, the protective part 16 may be made of an inorganic solid electrolyte material, such as a sulfide solid electrolyte, where the electrolyte material and the inorganic solid electrolyte material are well known to those skilled in the art and will not be described herein again.

It should be noted that the battery 60 may include a battery pole piece 10 and a pole piece 20 opposite to the battery pole piece 10, wherein the pole piece 20 includes a second current collector 22 and a second electrode material layer 24 disposed on the second current collector 22, and the second electrode material layer 24 is opposite to the first electrode material layer 14. Since the pole piece 20 generates burrs substantially perpendicular to the first electrode material layer 14 during cutting, the burrs easily pierce the first electrode material layer 14, which may cause short circuit of the battery 60, and therefore, the burrs can be inserted into the protective portion 16 by providing the protective portion 16, and the burrs are prevented from being directly inserted into the first electrode material layer 14. The battery pole piece 10 can be a negative pole piece, and the pole piece 20 can be a positive pole piece, that is, the protection part 16 can be preferably arranged on the negative pole piece, so that the performance of the battery 60 can be basically not influenced; the first current collector 12 may be one selected from a stainless steel piece, an aluminum piece, and a copper piece, and the first electrode material layer 14 may be a negative electrode material layer, which is well known to those skilled in the art and will not be described herein; the electrode sheet 20 may be a positive electrode sheet, wherein the second current collector 22 may be one selected from a stainless steel piece, an aluminum piece, and a copper piece, and the second electrode material layer 24 may be a positive electrode material layer, which is well known to those skilled in the art and will not be described herein.

The edge of the battery pole piece 10 can extend beyond the edge of the pole piece 20, that is, the size of the battery pole piece 10 is larger than that of the pole piece 20, so that the design standard of the battery 60 is met, and when the battery pole piece 10 is a negative pole piece and the pole piece 20 is a positive pole piece, the edge of the battery pole piece 10 extends beyond the edge of the pole piece 20, and the preparation cost of the battery 60 can be reduced.

Of course, a guard may also be provided in the second electrode material layer 24 of the electrode sheet 20 as the positive electrode, which guard may be inserted by burrs on the first current collector 12 of the battery electrode sheet 10.

To facilitate the provision of the guard 16, a recess 140 may be provided in a first face of the first electrode material layer 14 facing away from the first current collector 12 to accommodate the guard 16. Specifically, after the first battery material layer 14 is molded, the desired groove 140 may be formed on the first battery material layer 14. Preferably, a surface of the guard 16 facing away from the first current collector 12 may be flush with a surface of the first electrode material layer 14 facing away from the first current collector 12.

As shown in fig. 2c, the groove 140 may have a ring shape, the guard 16 may also have a ring shape, and the guard 16 may cooperate with the groove 140. Specifically, the material liquid constituting the protective portion 16 may be filled in the groove 140, and after the material liquid is dried, the protective portion 16 may be formed. Among them, the groove width of the groove 140 may preferably be 0.01mm to 3mm, further preferably, the groove width of the groove 140 may preferably be 0.3mm to 2mm, and still further preferably, the groove width of the groove 140 may preferably be 1mm to 1.5 mm.

The area of the guard 16 defined in the width direction of the guard 16 is provided for the projection of the corresponding edge portion of the pole piece 20 to fall into, so that the burr on the second current collector 22 of the pole piece 20 can be substantially inserted into the guard 16, thereby serving as a good guard, so that the first electrode material layer 14 is not easily pierced by the burr. It will be appreciated that the projection of the edge portion of the pole piece 20 may fall within the area defined by the portion of the guard 16 adjacent to the edge portion. In addition, since the edge portions of the pole piece 20 may be substantially perpendicular to the first battery material layer 14, providing the guard 16 in an area defined in the width direction of the guard 16 for a projection of the corresponding edge portion of the pole piece 20 to fall into may facilitate insertion of burrs on the second current collector 22 of the pole piece 20. Note that the width of the guard 16 can be understood as a distance of the guard 16 in the horizontal direction.

The battery plate 10 may include an electrolyte layer 18 covering the first electrode material layer 14, and it is understood that the electrolyte layer 18 is provided, and the battery 60 may be a solid-state battery, and during the process of preparing the battery plate 10, the electrolyte solution constituting the electrolyte layer 18 may be covered on the first surface of the first electrode material layer 14 away from the first current collector 12, and after the electrolyte solution is dried, the electrolyte layer 18 is formed. Electrolyte layer 18 may be formed of an electrolyte material, and further preferably, electrolyte layer 18 may be an inorganic solid electrolyte such as a sulfide solid state electrolyte, that is, electrolyte layer 18 may be formed of an inorganic solid electrolyte material, wherein the electrolyte material and the inorganic solid electrolyte material are well known to those skilled in the art and will not be described herein.

In order to facilitate the preparation of the battery pole piece 10 and further reduce the influence of the protective part 16 on the performance of the battery 60, the electrolyte layer 18 and the protective part 16 may be formed into an integrated structure, and it can be understood that, in the preparation process, the electrolyte solution may be coated on the surface of the first electrode material layer 14, the electrolyte solution is filled in the groove 140, and after the electrolyte solution is dried, the integrated structure of the electrolyte layer 18 and the protective part 16 may be formed. Wherein the electrolyte layer 18 may extend beyond the first electrode material layer 14, such that the performance of the battery 60 may be ensured.

The utility model also provides a battery is provided with in the battery 60 the utility model provides a battery pole piece 10. Through setting up in battery 60 the utility model provides a battery pole piece 10, reducible battery 60 has improved battery 60's safety in utilization because of the burr on the anodal mass flow body inserts the short circuit phenomenon that the negative material layer arouses.

The process of making the battery 60 will be further described with reference to fig. 2 a-2 e.

Step S10: as shown in fig. 2a, 2c and 2d, a negative electrode slurry containing a first electrode material is coated on the first current collector 12, a first electrode material layer 14 is formed after the negative electrode slurry is dried, and then, a first tab 40a is cut and attached; then, forming a ring-shaped groove 140 on the surface of the first electrode material layer 14, coating a feed liquid containing a sulfide solid electrolyte material on the surface of the first electrode material layer 14, and after the feed liquid is dried, forming an integrated structure of the protective part 16 and the electrolyte layer 18, thereby obtaining the battery pole piece 10, namely a negative pole piece, wherein the first current collector 12 is a stainless steel piece, and the negative pole slurry comprises a binder, a conductive agent and a negative active material;

step S20: as shown in fig. 2b, coating a positive electrode slurry containing a second electrode material on the second current collector 22, forming a second electrode material layer 24 after the positive electrode slurry is dried, and then cutting and attaching a second tab 40b, thereby obtaining a pole piece 20, i.e., a positive electrode pole piece, wherein the second current collector 22 is a stainless steel piece, the positive electrode slurry comprises a binder, a conductive agent and a positive active material, and the size of the pole piece 20 is smaller than that of the battery pole piece 10;

step S30: as shown in fig. 2e, the battery pole piece 10 obtained in the step S10 and the pole piece 20 obtained in the step S20 are opposed to each other, and a projection of an edge portion of the pole piece 20 is made to fall within an area defined in a width direction of the protector 16 by a portion of the protector 16 near the edge portion, thereby obtaining the battery 60.

The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited thereto. The technical idea of the utility model within the scope, can be right the utility model discloses a technical scheme carries out multiple simple variant, makes up with any suitable mode including each concrete technical feature. In order to avoid unnecessary repetition, the present invention does not separately describe various possible combinations. These simple variations and combinations should also be considered as disclosed in the present invention, all falling within the scope of protection of the present invention.

Claims

1. The battery pole piece is characterized in that the battery pole piece (10) comprises a first current collector (12) and a first electrode material layer (14) arranged on the first current collector (12), the battery pole piece (10) further comprises a protection part (16) arranged in the first electrode material layer (14), and the protection part (16) is arranged to be inserted with burrs of a second current collector (22) of a pole piece (20) opposite to the battery pole piece (10).

2. The battery pole piece according to claim 1, characterized in that a first face of the first electrode material layer (14) facing away from the first current collector (12) is provided with a recess (140) capable of accommodating the guard (16).

3. The battery pole piece according to claim 2, characterized in that the groove (140) is ring-shaped, the guard (16) is ring-shaped, and the guard (16) cooperates with the groove (140).

4. The battery pole piece according to claim 2, characterized in that the guard (16) is an electrolyte body.

5. The battery pole piece according to claim 4, characterized in that the battery pole piece (10) comprises an electrolyte layer (18) covering the first electrode material layer (14).

6. The battery pole piece according to claim 5, characterized in that the electrolyte layer (18) is formed as an integral structure with the guard (16); and/or

The electrolyte layer (18) extends beyond the first electrode material layer (14).

7. The battery pole piece of claim 2, wherein the groove (140) has a groove width of 0.01mm to 3 mm.

8. The battery pole piece according to claim 2, characterized in that the area of the guard (16) defined in the width direction of the guard (16) is intended for the projection of the respective edge portion of the pole piece (20) to fall into.

9. The battery pole piece according to any one of claims 1 to 8, characterized in that the battery pole piece (10) is a negative pole piece and the pole piece (20) is a positive pole piece; and/or

The edges of the battery pole piece (10) extend beyond the edges of the pole piece (20).

10. A battery, characterized in that a battery pole piece (10) according to any one of claims 1-9 is provided in the battery (60).