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Differential pitch pole piece and power battery adopting same

A power battery and pole piece technology, which is applied in the direction of secondary batteries, battery pack parts, non-aqueous electrolyte battery electrodes, etc., can solve the problems of large volume of elliptical batteries, difficulty in product quality control, and reduction of current impedance, etc., to achieve internal resistance Effect of small size, volume reduction and quality improvement

Inactive Publication Date: 2012-07-04
ZHEJIANG XINGHAI ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The tabs in the current production of power batteries are generally welded together with metal strips and pole pieces. Welding requires a lot of welding equipment, and it is common for the tabs to break during the welding process, and occasional false welding is also very common. Difficult to control, therefore, the product of this welded structure not only has complicated process, low production efficiency, but also has large current impedance, and the product quality is difficult to control. Therefore, the applicant proposed a patent number of 201020184982.1 on May 7, 2010, The name is a patent application for an elliptical power lithium-ion battery. The power battery includes a housing, a housing upper cover, and a housing bottom cover. The housing is provided with a winding core, and the housing upper cover is provided with a positive electrode The upper end of the winding core is provided with a negative electrode current collector corresponding to the negative electrode column, and the lower end of the winding core is provided with a positive electrode current collector corresponding to the positive electrode column. The production process of the oval power battery with this improved structure The process is simple, the production efficiency is obviously improved, and the current impedance during discharge can be reduced, which has a good effect. However, this structure is to set a negative current collector corresponding to the negative pole at the upper end of the winding core, and set a negative current collector at the lower end of the winding core. The positive current collector corresponding to the positive pole is set, and the negative current collector and the positive current collector are respectively connected to the negative pole and the positive pole through the negative connecting piece and the positive connecting piece. The current collection at the lower end takes up a lot of space, which makes the elliptical battery very large, which affects its application in many fields. Moreover, after the current collection at the lower end, it still needs to be led out to the pole at the upper end, and the structure is more complicated. To a certain extent, the volume is increased. Although the positive and negative poles of some batteries are located at both ends of the winding core, the applicability of this battery to the application environment is poor, and the application field is very limited, and the battery is not suitable for specific products. Inconvenient to install

Method used

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  • Differential pitch pole piece and power battery adopting same
  • Differential pitch pole piece and power battery adopting same
  • Differential pitch pole piece and power battery adopting same

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Such as figure 1 , 2 As shown, the differential pitch pole piece used for power batteries includes a coated part and an uncoated part above the coated part. The uncoated part is punched at intervals to form several protrusions. The widths are equal, and the distance between two adjacent protrusions increases from front to back to form a single-difference pitch structure, and the distance between two adjacent protrusions increases sequentially in an arithmetic sequence. The thicknesses of a diaphragm, the negative plate, and the second diaphragm are respectively r1, r2, r3, and r4, and the tolerance of the arithmetic sequence is 2kπ(r1+r2+r3+r4), wherein, k≥1, in a theoretical state, When fully fitting and winding, k should be equal to 1. In the actual winding process, due to the difference in tightness, k will be slightly greater than 1. Of course, in order to ensure the effect of winding, the range of adjustment coefficient k is generally 1≤k ≤1.2. After winding the...

Embodiment 2

[0023] Such as image 3 , 4As shown, the pole pieces with different pitches for power batteries include coated parts and uncoated parts. The uncoated parts are punched at intervals to form several protrusions. The distance between the protruding parts increases sequentially from front to back to form a double-difference pitch structure, and the distance between the first group of spaced protruding parts increases sequentially in the first arithmetic sequence, and the distance between the second group of spaced protruding parts The spacing of the interval increases in turn into the second arithmetic sequence, and the thicknesses of the positive plate, the first diaphragm, the negative plate, and the second diaphragm are respectively r1, r2, r3, r4, and the first arithmetic sequence and the second arithmetic sequence The tolerances are all kπ(r1+r2+r3+r4), where k≥1, under theoretical conditions, k should be equal to 1 when fully fitted and wound. In the actual winding process,...

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Abstract

The invention discloses a differential pitch pole piece and a power battery adopting the same, wherein the power battery comprises a battery cell, a positioning cover, an aluminium cover and a shell, the battery cell is arranged in the shell, the positioning cover is arranged above the battery cell, the aluminium cover is arranged above the positioning cover and is fixedly connected with the shell, the battery cell comprises a positive pole piece, a first membrane, a negative pole piece and a second membrane, both the positive and the negative pole pieces are differential pitch pole pieces, each differential pitch pole piece comprises a coating part and a non-coating part which is positioned above the coating part, the non-coating parts are punched at intervals to form a plurality of projecting parts, the widths of the projecting parts are the same, pitches between every two adjacent projecting parts are sequentially increased from front to back for forming a single differential pitch structure, or the pitches between every two spaced projecting parts are sequentially increased from front to back for forming a double-differential pitch structure, after the whole differential pitch pole pieces are wound, all the projecting parts are superposed with one another to form a pole lug, and the positive pole piece, the first membrane, the negative pole piece and the second membrane are stacked orderly to be wound into the battery cell. In the invention, the structure and the technology are simplified, the volume is reduced, and the quality of the power battery is improved.

Description

【Technical field】 [0001] The invention relates to a pole piece with a different pitch and a power battery using the pole piece with a different pitch. 【Background technique】 [0002] The tabs in the current production of power batteries are generally welded together with metal strips and pole pieces. Welding requires a lot of welding equipment, and it is common for the tabs to break during the welding process, and occasional false welding is also very common. Difficult to control, therefore, the product of this welded structure not only has complicated process, low production efficiency, but also has large current impedance, and the product quality is difficult to control. Therefore, the applicant proposed a patent number of 201020184982.1 on May 7, 2010, The name is a patent application for an elliptical power lithium-ion battery. The power battery includes a housing, a housing upper cover, and a housing bottom cover. The housing is provided with a winding core, and the hou...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M2/26H01M10/0587
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 徐敖奎王枭峰
Owner ZHEJIANG XINGHAI ENERGY TECH
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