CN215644609U

CN215644609U - Battery pole group and battery

Info

Publication number: CN215644609U
Application number: CN202121778125.9U
Authority: CN
Inventors: 耿华; 张相开; 南常争; 高阳阳; 孙光伟; 钱鑫
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2021-07-30
Filing date: 2021-07-30
Publication date: 2022-01-25
Anticipated expiration: 2031-07-30

Abstract

The utility model discloses a battery pole group and a battery, comprising: the pole piece, the pole piece is convoluteed to cylindric, and the pole piece has the unequal circle of coiling of a plurality of lengths, and the unequal circle of diameter can be convoluteed to a plurality of sections of coiling, has constructed a plurality of utmost point ears on the section of coiling, and a plurality of utmost point ears set gradually along the extending direction of the section of coiling, and a plurality of utmost point ears of the section of coiling can splice into the annular, and the side of two arbitrary adjacent utmost point ears can laminate each other. According to the embodiment of the utility model, the plurality of tabs are constructed on the winding section of the pole piece, the plurality of tabs of the winding section can be spliced into a ring, and the side edges of any two adjacent tabs can be mutually jointed, so that the tabs can be mutually jointed when the two ends of the battery pole group are kneaded and extruded, no gap or overlapping area exists between the tabs, metal scraps and dust are effectively reduced or even eliminated, and the electrolyte solution infiltration is facilitated.

Description

Battery pole group and battery

Technical Field

The utility model relates to the technical field of lithium batteries, in particular to a battery pole group and a battery.

Background

At present, lithium battery enterprises at home and abroad research the structural design of a circular full-lug in a full-force manner, the common design is that foil materials at the edges of positive and negative pole pieces are subjected to a blank reserving design, then the foil materials with enough length are reserved at the positive and negative ends of a pole group through winding equipment, and finally the foil materials at the two ends of the pole group are subjected to flat kneading extrusion, so that the pole group reaches a certain length. The method has the advantages of simple process, simple and easily-obtained equipment structure, controllable process and the like.

However, the above-mentioned method generates a large amount of metal scraps of the foil during the kneading and pressing of the electrode assembly, and although the problem can be improved by adding the negative pressure dust suction function, it is impossible to completely remove the metal scraps of the foil, which are the root cause of the high self-discharge of the lithium battery. And the larger metal chips are rubbed and pressed flatly, so that the risk of entering the interior of the pole group is caused, and great safety risk is caused. Secondly, the two ends of the electrode group after the flat kneading and extruding are covered by thick and compact metal foils, so that the difficulty of wetting the electrode plate and the diaphragm by the electrolyte is greatly increased, and the safety performance and the electrochemical performance are greatly influenced.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the utility model provides a battery pole group which can solve the problems that metal scraps are brought due to extrusion of a pole group foil, and the infiltration difficulty of electrolyte is high.

The utility model also aims to provide a battery to apply the battery pole group.

A battery pole group according to an embodiment of the present invention includes: the pole piece is wound into a cylindrical shape and provided with a plurality of winding sections with different lengths, the winding sections can be wound into circles with different diameters, a plurality of tabs are constructed on the winding sections and sequentially arranged along the extending direction of the winding sections, the tabs of the winding sections can be spliced into a ring shape, and the side edges of any two adjacent tabs can be mutually attached.

According to the battery pole group provided by the embodiment of the utility model, the plurality of tabs are constructed on the winding section of the pole piece, the plurality of tabs of the winding section can be spliced into a ring shape, and the side edges of any two adjacent tabs can be mutually attached, so that the tabs can be mutually attached when the two ends of the battery pole group are kneaded and extruded, no gap or overlapping area exists between the tabs, metal scraps and dust are effectively reduced or even eliminated, and the battery pole group is favorable for the infiltration of electrolyte.

In some embodiments, the tab has a top end and a bottom end, the bottom end is connected to the pole piece, and the length of the top end is less than the length of the bottom end.

In some embodiments, the tab is configured in a trapezoidal shape.

In some embodiments, the top ends of the tabs in different of the winding sections are of different lengths and the bottom ends of the tabs in different of the winding sections are of different lengths.

In some embodiments, in the direction from the outside to the inside of the cylindrical pole piece, the lengths of the top ends of the tabs and the lengths of the bottom ends of the tabs in the winding sections which are arranged in sequence decrease in sequence.

In some embodiments, the tabs are configured on the winding sections except for the winding sections near the center of the plurality of winding sections, and the winding sections at the center are wound to form a central hole.

In some embodiments, the two ends of each winding section are provided with marking holes.

In some embodiments, the pole piece and the tab are a single piece, and the tab is cut from the blank area of the pole piece.

In some embodiments, the width of the blank area of the pole piece is 6 to 8 mm.

A battery according to an embodiment of the present invention includes: the battery comprises a positive electrode group and a negative electrode group, wherein the positive electrode group and the negative electrode group are the battery pole groups.

According to the battery provided by the embodiment of the utility model, the positive electrode group and the negative electrode group formed by the battery electrode group are adopted, the generation of metal scraps and dust can be reduced when the electrode group is kneaded, flattened and extruded, the infiltration of electrolyte is easy to realize, and the safety risk of the battery is favorably reduced.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a top view of a battery pole set in an embodiment of the utility model;

FIG. 2 is a schematic diagram of a pole piece in an expanded state according to an embodiment of the present invention;

fig. 3 is an enlarged view of a tab in an embodiment of the present invention.

Reference numerals:

100. a battery pole group;

10. pole pieces; 101. a winding section; 102. marking the hole; 103. a blank area;

20. a tab; 201. a top end; 202. a bottom end.

30. A central bore.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, features defined as "first" and "second" may explicitly or implicitly include one or more of the features for distinguishing between descriptive features, non-sequential, non-trivial and non-trivial.

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 meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

A battery pole group 100 according to an embodiment of the present invention will be described with reference to fig. 1 and 2.

As shown in fig. 1 and 2, a battery pole group 100 according to an embodiment of the present invention includes: a pole piece 10.

The pole piece 10 is wound into a cylindrical shape, the pole piece 10 is provided with a plurality of winding sections 101 with different lengths, the winding sections 101 can be wound into circles with different diameters, a plurality of tabs 20 are constructed on the winding sections 101, the tabs 20 are sequentially arranged along the extending direction of the winding sections 101, the tabs 20 of the winding sections 101 can be spliced into a ring, and the side edges of any two adjacent tabs 20 can be attached to each other.

It can be understood that, this battery utmost point group 100 is as the utmost point group part of battery, both can be positive pole group, also can be negative pole group, pole piece 10 can be the foil, can wind into cylindricly, pole piece 10 need rub flat extrusion when coiling the end, rub flat extrusion, because it has a plurality of utmost point ear 20 to construct on the section 101 of rolling up, rub the side of two arbitrary adjacent in a plurality of utmost point ears 20 after flat extrusion and can laminate each other, guarantee not both not having the space and not having overlap region, make the degree of difficulty of laminating of the terminal surface of utmost point group lower, its terminal surface is more level and more smooth, show the welding degree of difficulty that reduces utmost point ear 20 and the probability that unusual scene appears, be difficult to produce utmost point ear 20 folding abnormality when the running roller of coiler is handled simultaneously, reducible metal piece and dust, reduce the safety risk of battery. Secondly, the overall thickness of the tab 20 is relatively thin, which is beneficial to the infiltration of electrolyte.

According to the battery pole group 100 provided by the embodiment of the utility model, the winding section 101 of the pole piece 10 is provided with the plurality of tabs 20, the tabs 20 of the winding section 101 can be spliced into a ring shape, and the side edges of any two adjacent tabs 20 can be mutually attached, so that the tabs 20 can be mutually attached when the two ends of the battery pole group 100 are flatly kneaded and extruded, no gap or overlapping area exists between the tabs, metal scraps and dust are effectively reduced or even eliminated, and the battery pole group 100 is favorable for the infiltration of electrolyte.

In some embodiments, as shown in fig. 3, the tab 20 has a top end 201 and a bottom end 202, the bottom end 202 is connected to the pole piece 10, and the length of the top end 201 is less than the length of the bottom end 202. That is, the tab 20 has two ends with different sizes, and the top end 201 is close to the center side of the cylindrical pole piece 10, so as to ensure that after the pole piece 10 is wound, the plurality of tabs 20 on each winding section 101 can be wound into a circle, and the side edges of the tabs 20 are attached to each other without gaps.

In some embodiments, as shown in fig. 3, the tabs 20 are configured to be trapezoidal, and after each winding section 101 is wound to be a circle, the trapezoidal side edge of each tab 20 can be attached to the trapezoidal side edges of two adjacent tabs 20, so that the tabs 20 are configured to be trapezoidal structures, which is simple to manufacture and beneficial to reducing the cost.

In another embodiment, the tabs 20 may also be configured in a fan shape, and both side edges of the fan shape may be attached to the fan-shaped side edges of two adjacent tabs 20, so as to ensure that there is no gap or overlapping area between the tabs 20.

In some embodiments, the top ends 201 of the pole ears 20 in different winding sections 101 are of different lengths and the bottom ends 202 of the pole ears 20 in different winding sections 101 are of different lengths. Because the diameters of the different winding sections 101 after winding are different, the more the winding sections are close to the center of the cylindrical pole piece 10, the smaller the diameter of the winding sections 101 after winding is, the different lengths of the top end 201 and the bottom end 202 of the pole lug 20 in the different winding sections 101 are set to be different, and the number of the pole lugs 20 on each winding section 101 can be adjusted, so that the better attaching effect of splicing the plurality of pole lugs 20 into a circular rear edge is ensured, and the seamless and non-overlapping area is more favorably realized. For example, the winding section 101 closer to the center of the cylindrical pole piece 10 has a shorter length, and the circle radius formed by the winding is smaller, if the winding section 101 is the same as the tab 20 of the winding section 101 on the outer ring side, the circular effect formed by splicing the plurality of tabs 20 is poor, and a gap is easy to occur, so that the lengths of the top end 201 and the bottom end 202 of the tab 20 in the winding section 101 closer to the center of the cylindrical pole piece 10 can be set to be smaller, so as to ensure that the attaching effect of the plurality of tabs 20 after splicing is better.

In some embodiments, the lengths of the top ends 201 of the tabs 20 and the lengths of the bottom ends 202 of the tabs 20 in the winding sections 101 sequentially arranged in the direction from the outside to the inside of the cylindrical pole piece 10 are sequentially reduced. It will be understood that the plurality of wound sections 101 of the pole piece 10 can be sequentially (in the left-to-right direction in fig. 2) written as: the first winding section and the second winding section … … are the Nth winding section, the first winding section winds the outermost circle of the pole group, and the lengths of the top end 201 and the bottom end 202 of the tab 20 decrease progressively from the first winding section to the Nth winding section.

For example, when a pole group with a diameter of 44mm is described, in the winding section 101 of the outermost ring, the length of the top end 201 of the tab 20 is 5.3mm, the length of the bottom end 202 is 6.0mm, and the height of the entire tab 20 is 6.0mm, in the winding section 101 at the inner ring radius of 6.0mm in the pole group, the length of the top end 201 of the corresponding tab 20 is 1.5mm, the length of the bottom end 202 is 3.0mm, and the height of the entire tab 20 is 6.0mm, and in the winding sections 101 between the outermost ring and the inner ring radius of 6.0mm in the pole group, the length of the top end 201 and the length of the bottom end 202 of the tab 20 are sequentially decreased. Specifically, the lengths of the top end 201 and the bottom end 202 of the tab 20 can be calculated by the diameter of each winding section 101 after winding.

In some embodiments, the tabs 20 are configured on the winding sections 101 except for the winding section 101 near the center of the plurality of winding sections 101, and the central winding section 101 is wound to form the central hole 30. With reference to the foregoing, the plurality of wound segments 101 of the pole piece 10 can be sequentially (from left to right in fig. 2) written as: the winding structure comprises a first winding section, an Nth winding section of a second winding section … … and a tab-free section, wherein the first winding section is wound to form the outermost circle of a pole group, and the part of the winding section 101 close to the center is the tab-free section.

That is to say, the partial winding section 101 near the center is an ear-free section, that is, no tab 20 is provided, so that the periphery of the central hole 30 after the partial winding section 101 is wound up is not covered by the tab 20, which is beneficial to the central tube insertion and the electrolyte infiltration, and secondly, a diaphragm is required to be provided on the central hole 30, and since the partial winding section 101 is an ear-free section, the diaphragm around the central hole 30 is not damaged, and metal debris is not generated around the central hole 30 in the process of pressing.

In some embodiments, the number of partially wound sections 101 near the center may be one, i.e., only one wound section 101 is not provided with a tab 20. Alternatively, the number of the partial coil sections 101 near the center may be two, in such a way as to ensure sufficient space around the center hole 30, which is more advantageous for avoiding metal chips. Of course, this is only an example, and the number of the partial winding sections 101 near the center can be specifically set according to the situation, and will not be described herein.

In some embodiments, as shown in fig. 2, the two ends of each winding segment 101 are provided with marking holes 102, the positions of the different winding segments 101 on the pole piece 10 can be easily known through the marking holes 102, the tab 20 can be conveniently arranged, and each winding segment 101 can be distinguished during winding.

In some embodiments, the pole piece 10 and the tab 20 are an integral piece, and the tab 20 is made by cutting a blank area 103 of the pole piece 10, that is, the pole piece 10 is made of a foil, a strip-shaped blank area 103 is reserved on the top of the foil, and the blank area 103 is cut by laser to obtain a plurality of tabs 20, without providing a winding section 101 of the tab 20, only the blank area 103 is cut completely.

In some embodiments, as shown in fig. 2, the width of the blank area 103 of the pole piece 10 is 6 to 8mm, and the blank area 103 in this range is set to obtain the tab 20 with the height required for the voltage-reduction.

One embodiment of the battery pole set 100 of the present invention is described below with reference to the drawings.

As shown in fig. 1 to 3, a battery pole group 100 includes: a pole piece 10.

The tab 20 is configured in a trapezoidal shape having a top end 201 and a bottom end 202, the bottom end 202 connecting the pole pieces 10, the length of the top end 201 being smaller than the length of the bottom end 202.

In the direction from the outside to the inside of the cylindrical pole piece 10, the lengths of the top ends 201 of the tabs 20 and the lengths of the bottom ends 202 of the tabs 20 in the winding sections 101 arranged in sequence decrease in sequence.

The tabs 20 are formed on the winding sections 101 except for the winding section 101 near the center of the plurality of winding sections 101, and the central winding section 101 is wound to form the central hole 30.

A marking hole 102 is provided between any adjacent two of the winding sections 101.

The pole piece 10 and the pole lug 20 are an integral piece, the pole lug 20 is cut from the blank area 103 of the pole piece 10, and the width of the blank area 103 of the pole piece 10 is 6-8 mm.

A battery according to an embodiment of the present invention includes: a positive electrode set and a negative electrode set, both of which are the battery pole set 100 described above. Wherein, the battery can be a round steel shell lithium battery.

According to the battery provided by the embodiment of the utility model, the positive electrode group and the negative electrode group formed by the battery pole group 100 are adopted, so that the generation of metal scraps and dust can be reduced when the pole groups are kneaded, flattened and extruded, the infiltration of electrolyte is easy to realize, and the safety risk of the battery is favorably reduced.

Other constructions, etc. and operations of the battery according to the embodiment of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.

In the description herein, references to the description of the terms "embodiment," "example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the utility model have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the utility model, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery pole pack (100), comprising:

the pole piece (10) is wound into a cylindrical shape, the pole piece (10) is provided with a plurality of winding sections (101) with different lengths, the winding sections (101) can be wound into circles with different diameters, a plurality of tabs (20) are constructed on the winding sections (101), the tabs (20) are sequentially arranged along the extending direction of the winding sections (101), the tabs (20) of the winding sections (101) can be spliced into a ring shape, and the side edges of any two adjacent tabs (20) can be mutually attached.

2. The battery pole group (100) of claim 1, wherein the tab (20) has a top end (201) and a bottom end (202), the bottom end (202) connecting the pole pieces (10), the top end (201) having a length less than the bottom end (202).

3. The battery pole group (100) of claim 2, wherein the tabs (20) are configured as trapezoids.

4. The battery pole group (100) of claim 2, wherein the top ends (201) of the tabs (20) in different winding sections (101) are unequal in length and the bottom ends (202) of the tabs (20) in different winding sections (101) are unequal in length.

5. The battery pole group (100) of claim 4, characterized in that in the direction from outside to inside of the cylindrical pole piece (10), the lengths of the top ends (201) of the tabs (20) and the lengths of the bottom ends (202) of the tabs (20) in the winding sections (101) arranged in sequence decrease in sequence.

6. The battery pole group (100) according to claim 1, wherein a part of the winding sections (101) except the winding section (101) near the center among the plurality of winding sections (101) is configured with the tab (20), and the winding section (101) at the center is wound to form a central hole.

7. The battery pole group (100) of claim 1, wherein both ends of each winding section (101) are provided with marking holes (102).

8. The battery pole group (100) according to claim 1, characterized in that the pole piece (10) and the tab (20) are in one piece, the tab (20) being cut from the blank area (103) of the pole piece (10).

9. The battery pole group (100) of claim 8, wherein the blank area (103) of the pole piece (10) has a width of 6 to 8 mm.

10. A battery, comprising: a positive electrode set and a negative electrode set, both of which are the battery pole set (100) according to any one of claims 1 to 9.