CN209071490U - Tab with trapezoidal structure for ternary lithium ion battery - Google Patents

Abstract

The utility model discloses a utmost point ear that is used for ternary lithium ion battery to have trapezium structure, include: the battery comprises a battery body, N anode lugs and (N +1) cathode lugs; the N positive pole lugs are fixedly connected to the top of a positive pole piece of the battery body and are arranged at intervals to form a positive pole lug; the (N +1) negative pole lug pieces are fixedly connected to the top of the negative pole piece of the battery body, and the (N +1) negative pole lug pieces are arranged at intervals to form a negative pole lug together. The utility model discloses the battery is at the in-process of charge-discharge, and the heat that positive pole ear produced can be through the space effluvium between two arbitrary adjacent positive pole auricles, and the heat that negative pole ear produced can be through the space effluvium between two arbitrary adjacent negative pole auricles, is favorable to increasing the heat dissipation of positive pole ear when the battery overflows, is showing the temperature rise that reduces battery positive pole ear overcurrent.

Description

A tab with trapezoidal structure for ternary lithium ion battery

technical field

The utility model relates to the technical field of lithium ion batteries, in particular to a pole lug with a trapezoidal structure for a ternary lithium ion battery.

Background technique

The positive and negative active materials of lithium-ion batteries need to be coated on aluminum and copper current collectors, and connected to the battery poles and external circuits through the tabs. The size and shape of the tabs will affect the production of the battery during operation. Heat and temperature rise have significant effects.

The tabs of lithium-ion batteries are usually designed in a regular quadrilateral structure. The tabs of this structure cannot disperse the current when the current passes, resulting in high heat generation and high temperature at the tabs. However, for a high specific energy ternary lithium-ion battery, the current intensity during the charging and discharging process is large, and the conventional regular quadrilateral structure of the tab cannot meet the requirements of dispersing the current, resulting in heat generation and excessive temperature rise at the connection between the tab and the battery pole piece. high.

Utility model content

In order to solve the technical problems existing in the background technology, the present invention proposes a tab with a trapezoidal structure for a ternary lithium ion battery.

The utility model proposes a pole lug with a trapezoidal structure for a ternary lithium ion battery, comprising: a battery body, N positive pole lugs and (N+1) negative pole lugs;

N positive electrode tabs are fixedly connected to the top of the positive electrode tab of the battery body, and the N positive electrode tabs are arranged at intervals to form a positive tab; (N+1) negative electrode tabs are fixedly connected to the negative electrode of the battery body The top of the pole piece, and (N+1) negative pole tabs are arranged at intervals to form a negative pole tab.

Preferably, each positive electrode tab has a trapezoidal structure, and the lower bottom of the positive electrode tab is fixedly connected to the top of the positive electrode tab of the battery body.

Preferably, the length of the lower bottom of each positive electrode tab is 36 mm, the length of the upper bottom is 26 mm, the height is 25 mm, and the thickness is 10 um.

Preferably, the number of positive electrode tabs is 18-20.

Preferably, each negative electrode tab has a trapezoidal structure, and the lower bottom of the negative electrode tab is fixedly connected to the top of the negative electrode tab of the battery body.

Preferably, the length of the lower bottom of each negative electrode tab is 36mm, the length of the upper bottom is 26mm, the height is 25mm, and the thickness is 8um.

In the utility model, the proposed ternary lithium ion battery has a trapezoidal structure tab, the positive electrode tab is composed of N positive electrode tabs spaced apart, and the negative electrode tab is composed of (N+1) negative electrode tabs spaced apart In the process of charging and discharging the battery, the heat generated by the positive electrode tabs can be dissipated through the gap between any two adjacent positive electrode tabs, and the heat generated by the negative electrode tabs can pass through any adjacent two negative electrodes. The gap between the tabs is dissipated, which is beneficial to increase the heat dissipation of the positive and negative electrodes when the battery is overcurrent, and significantly reduce the temperature rise of the positive and negative electrodes of the battery overcurrent.

Description of drawings

FIG. 1 is a schematic structural diagram of a tab with a trapezoidal structure for a ternary lithium-ion battery proposed by the present invention.

Detailed ways

As shown in FIG. 1 , FIG. 1 is a schematic structural diagram of a tab with a trapezoidal structure for a ternary lithium ion battery proposed by the present invention.

Referring to FIG. 1 , a pole lug with a trapezoidal structure for a ternary lithium ion battery proposed by the present utility model includes: a battery body 1 , N positive pole tabs 2 and N+1 negative pole tabs 3 ;

N positive electrode tabs 2 are fixedly connected to the top of the positive electrode tab of the battery body 1, and N positive electrode tabs 2 are arranged at intervals to form a positive tab; N+1 negative electrode tabs 3 are fixedly connected to the battery body. 1 at the top of the negative pole piece, and N+1 negative pole tabs 3 are arranged at intervals to form a negative pole tab.

In the specific working process of the tabs with trapezoidal structure used in the ternary lithium-ion battery in this embodiment, one end of the N positive tabs is fixedly connected to the top of the positive pole piece of the battery body 1, and the other end is fixedly connected to the top of the battery cover plate. One end of the N+1 negative pole tabs 3 is fixedly connected to the top of the negative pole piece of the battery body 1, and the other end is fixedly connected to the pole of the battery cover plate, and the battery is charged and discharged after assembly.

In this embodiment, the proposed ternary lithium-ion battery has a trapezoidal structure tab, the positive tab is composed of N positive tabs 2 at intervals, and the negative tab is composed of N+1 negative tabs 3 In the process of charging and discharging the battery, the heat generated by the positive electrode tabs can be dissipated through the gap between any two adjacent positive electrode tabs 2, and the heat generated by the negative electrode tabs can pass through any adjacent two. The gaps between the negative electrode tabs 3 are dissipated, which is beneficial to increase the heat dissipation of the positive and negative electrodes when the battery is overcurrent, and significantly reduce the temperature rise of the positive and negative electrodes of the battery overcurrent.

In the specific embodiment, in order to reduce the impedance between the positive electrode tab 2 and the battery cover plate pole, reduce the temperature difference between the positive electrode tab 2 and the battery positive plate and the battery cover plate pole during operation, each The positive electrode tabs 2 are all trapezoidal structures, and the lower bottom of the positive electrode tab 2 is fixedly connected to the top of the positive electrode tab of the battery body 1 .

Further, in order to match the size of the battery cover plate, the length of the lower bottom of each positive electrode tab 2 is 36 mm, the length of the upper bottom is 26 mm, the height is 25 mm, and the thickness is 10 um.

Further, in order to match the capacity of the battery, the number of the positive electrode tabs 2 is 18-20.

Further, in order to reduce the impedance between the negative pole tab 3 and the battery cover plate pole, reduce the temperature difference between the negative pole tab 3 and the battery negative and positive pole pieces and the battery cover plate pole during operation, each negative pole The tabs 3 are all trapezoidal structures, and the lower bottom of the negative electrode tab 3 is fixedly connected to the top of the negative electrode of the battery body 1 .

Further, in order to match the size of the battery cover, the length of the lower bottom of each negative electrode tab 3 is 36mm, the length of the upper bottom is 26mm, the height is 25mm, and the thickness is 8um.

The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited to this. Equivalent replacement or modification of the new technical solution and its utility model concept shall be included within the protection scope of the present utility model.

Claims (6)

1. A pole lug with a trapezoidal structure for a ternary lithium ion battery, characterized in that it comprises: a battery body (1), N positive pole lugs (2) and (N+1) negative pole lugs (3); The N positive electrode tabs (2) are fixedly connected to the top of the positive electrode tab of the battery body (1), and the N positive electrode tabs (2) are arranged at intervals to form a positive tab; (N+1) negative electrodes The tabs (3) are fixedly connected to the top of the negative electrode tab of the battery body (1), and (N+1) negative tabs (3) are arranged at intervals to form a negative tab. 2. The tab for a ternary lithium-ion battery with a trapezoidal structure according to claim 1, wherein each positive tab (2) is a trapezoidal structure, and the lower part of the positive tab (2) has a trapezoidal structure. The bottom is fixedly connected with the top of the positive pole piece of the battery body (1). 3. The pole lug with trapezoidal structure for ternary lithium ion battery according to claim 2, characterized in that, the length of the bottom of each positive pole tab (2) is 36mm, the length of the upper bottom is 26mm, and the height is 36mm. It is 25mm and the thickness is 10um. 4 . The tab for ternary lithium ion battery with trapezoidal structure according to claim 1 , wherein the number of positive tabs ( 2 ) is 18-20. 5 . 5. The pole lug with a trapezoidal structure for a ternary lithium-ion battery according to claim 1, wherein each negative pole tab (3) is a trapezoidal structure, and the lower part of the negative pole tab (3) has a trapezoidal structure. The bottom is fixedly connected with the top of the negative pole piece of the battery body (1). 6. The pole lug with a trapezoidal structure for a ternary lithium ion battery according to claim 5, wherein the length of the lower bottom of each negative pole lug piece (3) is 36mm, the length of the upper bottom is 26mm, and the height It is 25mm and the thickness is 8um.