CN215119168U

CN215119168U - Battery with a battery cell

Info

Publication number: CN215119168U
Application number: CN202121130624.7U
Authority: CN
Inventors: 张璐璐
Original assignee: CALB Technology Co Ltd
Current assignee: Avic Innovation Technology Research Institute Jiangsu Co ltd
Priority date: 2021-05-25
Filing date: 2021-05-25
Publication date: 2021-12-10
Anticipated expiration: 2031-05-25

Abstract

The utility model belongs to the field of chemical power supply, in particular to a battery which comprises a battery cell body and a tab; the battery cell body comprises a pole piece, and the pole piece is connected with a pole lug; the tab comprises a first connecting part, a second connecting part and a bending part, the first connecting part is connected with the battery leading-out end, the second connecting part is connected with the battery cell body, and the bending part is connected with the first connecting part and the second connecting part; the tab is provided with a first insulation layer on the surface close to the cell body, and the first insulation layer extends from the joint of the tab and the tab to exceed all the tabs of the cell body along the leading-out direction of the tab and does not extend to the joint of the bending part and the first connecting part. The utility model discloses a set up the first insulation layer on the surface that is close to with electric core body at battery tab, can avoid being connected and the short circuit that leads to because the diaphragm is punctured the pole piece of the different polarity that leads to and the side electricity of utmost point ear to improve the security of battery.

Description

Battery with a battery cell

Technical Field

The utility model relates to a chemical power source technical field, concretely relates to battery.

Background

The size of the negative plate inside the existing battery generally exceeds that of the positive plate, the design has the risk that the negative plate punctures the diaphragm and is communicated with the lug of the positive plate, an insulating coating is usually arranged at the leading-out end part of the lug of the positive plate, the height of the insulating coating is generally close to the highest position of the negative plate, and the conduction of the positive plate and the negative plate is prevented. However, in the battery with the tabs led out from the same side, the tabs need to be bent to be electrically connected with the adapter sheet or the battery post, and after the tabs of the positive electrode sheet are bent, the risk of the membrane being punctured and the conduction of the negative electrode sheet exists, which causes the internal short circuit of the battery.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects, the utility model provides a battery can provide the security of battery.

The utility model provides a battery, which comprises a battery cell body and a lug; the battery cell body comprises a pole piece, and the pole piece is connected with the pole lug; the tab comprises a first connecting part, a second connecting part and a bent part, the first connecting part is connected with a battery leading-out end, the second connecting part is connected with the battery cell body, and the bent part is connected with the first connecting part and the second connecting part; the surface of the lug close to the cell body is provided with a first insulating layer, and the first insulating layer extends from the joint of the pole piece and the lug to exceed all pole pieces of the cell body along the leading-out direction of the lug and does not extend to the joint of the bending part and the first connecting part.

The embodiment of the utility model provides a through set up the first insulation layer on battery tab, the first insulation layer sets up on the surface that utmost point ear and electric core body are close to, and the first insulation layer is originated from the junction of pole piece and utmost point ear, and all pole pieces that the direction of drawing along utmost point ear extends beyond electric core body and do not extend to the junction of kink and first connecting portion, can avoid because the diaphragm is punctured the short circuit that leads to by the different polarity's that leads to pole piece and utmost point ear electricity connection to improve the security of battery.

Drawings

The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

Fig. 1 is a schematic diagram of a battery according to an embodiment of the present invention.

Fig. 2 is a schematic diagram of a battery according to another embodiment of the present invention.

Fig. 3 is a schematic diagram of a battery according to another embodiment of the present invention.

Wherein the reference numerals are as follows:

10: cell body

10 a: positive plate

10 b: negative plate

10 c: diaphragm

11: tab for fixing a terminal

111: first connecting part

112: a bent part

113: second connecting part

12: a first insulating layer

11 a: positive plate tab

11 b: negative pole piece tab

20: leading-out terminal

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. In the drawings, the thickness of regions and layers are exaggerated for clarity. The same reference numerals denote the same or similar structures in the drawings, and thus detailed descriptions thereof will be omitted.

The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that the invention may be practiced without one or more of the specific details, or with other methods, components, materials, and so forth. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring aspects of the invention.

In the description of the present invention, unless explicitly stated or limited otherwise, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The terms "connected," "secured," and the like are to be construed broadly and unless otherwise stated or indicated, and for example, "connected" may be a fixed connection, a removable connection, an integral connection, an electrical connection, or a signal connection; "connected" may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present disclosure can be understood by those skilled in the art as the case may be.

In an embodiment of the present invention, as shown in fig. 1, the battery includes a battery cell body 10 and a tab 11. The tab 11 is of a bent structure and is connected to the leading-out terminal 20. The terminals 20 may be a cover plate assembly, or may be connectors for connecting the tab 11 and the cover plate assembly. The cell body 10 includes a pole piece, and the pole piece is connected with the tab 11. The tab 11 includes a first connection portion 111, a second connection portion 113 and a bending portion 112, the first connection portion 111 is connected to the battery lead-out terminal 20, the second connection portion 113 is connected to the cell body 10, and the bending portion 112 connects the first connection portion 111 and the second connection portion 113. The tab 11 is provided with a first insulating layer 12 on a surface close to the cell body 10, and the first insulating layer 12 extends from a joint of the tab 11 and the pole piece beyond all the pole pieces of the cell body 10 along a leading-out direction of the tab 11 and does not extend to a joint of the bending portion 112 and the first connecting portion 111.

The utility model discloses well "the battery draws forth the end" and indicates the part that this battery is connected with outside other batteries or equipment electricity, and the battery draws forth the end and can be utmost point post, terminal, also can be for the switching piece of being connected with battery utmost point post, terminal electricity. The "surface of the tab close to the cell body" is the surface of the tab close to the cell relative to the other surface of the tab, and the thickness of the single tab is ignored here, that is, the surface of the tab is the two large surfaces opposite to the tab.

Fig. 2 shows the positive electrode tab 10a, the negative electrode tab 10b, and the separator 10c constituting the cell body 10. In general, the height of the positive electrode tab 10a in the battery cell 10 is smaller than that of the negative electrode tab 10b, and the height of the negative electrode tab 10b is smaller than that of the separator 10c, so that when the

tabs

11a and 11b are bent, the negative electrode tab 10b may pierce the separator 10c, and the

tabs

11a or 11b may contact with the

tabs

10b or 10a with different polarities, thereby causing a short circuit. To avoid this, the height of the first insulating layer 12 of the tab 11 on the surface close to the cell body 10 must at least exceed the height of all the pole pieces. As shown in fig. 2, the height of the first insulating layer 12 provided on the surface of the positive electrode tab 11a is at least higher than the height h. If the first insulating layer 12 is disposed on the surface of the negative electrode tab 11b, the first insulating layer 12 may be disposed on the negative electrode tab 11b to meet the above requirement since the negative electrode tab 11b exceeds the height of all the electrode tabs. Fig. 2 illustrates the positive electrode tab 10b having a height lower than that of the negative electrode tab 10b, and the inventive concept of the present invention is not intended to be limited thereto. The invention conception of the utility model is also suitable for the battery with the height of the negative plate lower than that of the positive plate.

In an alternative embodiment, as shown in fig. 3, the first insulating layer 12 extends to the connection of the bent portion 112 and the second connection portion 113 in the lead-out direction of the tab 11. This is to prevent the first insulating layer 12 at the bent portion from being under high tension and thus easily causing a dusting phenomenon at the bent portion, thereby affecting the performance and the service life of the battery.

The first insulating layer 12 is an insulating coating, and the insulating coating is a coating of one or more of polyvinylidene fluoride, polyethylene, alumina, or boehmite. When the insulating coating is formed of two or more of the above substances, the respective substances in the coating may be in any compounding ratio. The first insulating layer 12 may be formed on the surfaces of the tabs 11 in any suitable manner.

The thickness of the first insulating layer 12 is 10-40 μm. One skilled in the art can select an appropriate thickness depending on the particular choice of substance, such as, but not limited to, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, and the like.

In an alternative embodiment, the tab 11 provided with the first insulating layer 12 may be a positive tab 11, a negative tab 11, and the first insulating layer 12 may be provided on the surface of both the positive tab 11 and the negative tab 11.

In an alternative embodiment, the surface of the tab 11 away from the cell body 10 further includes a second insulating layer (not shown in the figure). Preferably, the second insulating layer is disposed on a tab of the pole piece with the lowest pole piece height in the battery cell, as shown in fig. 2, the second insulating layer is generally a positive pole piece tab 11 a. The second insulating layer is disposed on the surface of the positive electrode tab 11a far from the battery cell body 10, and the height of the second insulating layer at least exceeds the height of the negative electrode tab 10b, so as to avoid the battery short circuit caused by the contact between the negative electrode tab 10b and the positive electrode tab 11a after the diaphragm 10c is pierced. The second insulating layer is disposed on the positive electrode tab 11, and the second insulating layer extends from the joint of the electrode tab 11 and the electrode tab, and extends beyond the electrode tab of the cell body 10 along the leading-out direction of the electrode tab 11 and does not extend to the joint of the bending portion 112 and the first connecting portion 111.

Preferably, the second insulating layer extends to the joint of the bent portion 112 and the second connecting portion 113 along the leading direction of the tab 11, so as to prevent the insulating layer at the bent portion 112 from falling off due to large tension, and further affecting the performance and the service life of the battery.

Preferably, the first connection portion 111 and the second connection portion 113 are disposed substantially in parallel ("substantially parallel" means that an included angle between the first connection portion 111 and the second connection portion 113 is in a range of 0 to 10 °). Because the first connecting portion 111 and the second connecting portion 113 are difficult to be completely parallel in actual production, and the process implementation difficulty is high, an included angle between the first connecting portion 111 and the second connecting portion 113 is 0-10 degrees, and the first connecting portion 111 and the second connecting portion 113 are arranged substantially in parallel, so that the occupation of the inner space of the battery after the tab 11 is bent is reduced to the maximum extent, and the space utilization rate of the inner part of the battery is improved.

The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best understand the invention for and utilize the invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. The battery is characterized by comprising a battery core body and a lug;

the battery cell body comprises a pole piece, and the pole piece is connected with the pole lug;

the tab comprises a first connecting part, a second connecting part and a bent part, the first connecting part is connected with a battery leading-out end, the second connecting part is connected with the battery cell body, and the bent part is connected with the first connecting part and the second connecting part; the surface of the lug close to the cell body is provided with a first insulating layer, and the first insulating layer extends from the joint of the pole piece and the lug to exceed all pole pieces of the cell body along the leading-out direction of the lug and does not extend to the joint of the bending part and the first connecting part.

2. The battery according to claim 1, wherein the first insulating layer extends to a connection of the bent portion and the second connection portion in a lead-out direction of the tab.

3. The battery of claim 1 or 2, wherein the first insulating layer is an insulating coating, and the insulating coating is a polyvinylidene fluoride, polyethylene, alumina, or boehmite coating.

4. The battery of claim 3, wherein the first insulating layer has a thickness of 10-40 μm.

5. The battery according to claim 1 or 2, wherein the tab is a positive tab, the pole piece comprises a negative pole piece and a positive pole piece, and the length of the negative pole piece along the tab leading direction is greater than the length of the positive pole piece along the tab leading direction.

6. The battery of claim 5, further comprising a second insulating layer disposed on a surface of the positive tab away from the cell body, wherein the second insulating layer extends from a junction of the pole piece and the tab beyond all the pole pieces of the cell body along a leading direction of the tab.

7. The battery according to claim 6, wherein the second insulating layer extends to a connection point of the bent portion and the second connection portion in a direction in which the tab is drawn out.

8. The battery of claim 1 or 2, further comprising a second insulating layer located on another surface of the tab away from the cell, wherein the second insulating layer extends from a junction of the pole piece and the tab beyond all the pole pieces of the cell body in a leading direction of the tab.

9. The battery according to claim 8, wherein the second insulating layer extends to a connection point of the bent portion and the second connection portion in a direction in which the tab is drawn out.

10. The battery according to claim 1 or 2, wherein the first connection portion and the second connection portion are arranged substantially in parallel.