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Secondary battery with high-ratio discharge characteristics and production method of secondary battery

A high-rate discharge, secondary battery technology, applied in secondary battery manufacturing, battery pack components, circuits, etc. The effect of low connection resistance and good high-rate discharge performance

Active Publication Date: 2013-01-16
宇恒电池股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual production, the applicant found that the shallow spot welding depth and the small number of welding points cannot obtain better high-rate discharge performance of the secondary battery.

Method used

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  • Secondary battery with high-ratio discharge characteristics and production method of secondary battery
  • Secondary battery with high-ratio discharge characteristics and production method of secondary battery
  • Secondary battery with high-ratio discharge characteristics and production method of secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] SC-type Ni-MH battery with a nominal battery capacity of 2500mAh is used. There are 3 tabs connected between the positive plate and the cap. The distance between the tabs is 6.0mm. The spot welding depth of the positive plate is 0.5mm. The material of the tabs is pure nickel strip. , the size is: width 3.5mm, thickness 0.10mm, the number of spot welding points of the positive tab is 1 point, and the battery internal resistance of this battery is 25mΩ. When the battery is discharged under the discharge current conditions of 0.2 rate (0.5 amps), 1 rate (2.5 amps), and 20 rate (50 amps), the 0.2 rate discharge capacity can reach 65% of the nominal capacity, and the 1 rate discharge capacity can reach the nominal capacity. 49% of the capacity, and the 20-rate discharge capacity is zero.

[0039] A method for preparing the above-mentioned secondary battery with high rate discharge characteristics, the method comprises the following steps:

[0040] 1) According to the number...

Embodiment 2

[0054] SC-type Ni-MH battery with a nominal capacity of 2500mAh is used. There are 3 lugs connecting the positive plate and the cap. The distance between the tabs is 6.0mm. The spot welding depth of the positive plate is 1.0mm. The material of the tabs is pure nickel strip. , the size is: width 3.5mm, thickness 0.10mm, the number of spot welding points of the positive tab is 2 points, and the battery internal resistance of this battery is 21mΩ. The battery is discharged under the discharge current conditions of 0.2 rate (0.5 ampere), 1 rate (2.5 ampere), and 20 rate (50 ampere). The 0.2 rate discharge capacity can reach 69% of the nominal capacity, the 1 rate discharge capacity can reach 55% of the nominal capacity, and the 20 rate discharge capacity is zero.

[0055] The preparation method of the above secondary battery is shown in Example 1.

Embodiment 3

[0057] SC-type Ni-MH battery with a nominal battery capacity of 2500mAh is used. There are 3 tabs connected between the positive plate and the cap. The distance between the tabs is 6.0mm. The spot welding depth of the positive plate is 1.5mm. The material of the tabs is pure nickel strip. , the size is: width 3.5mm, thickness 0.10mm, the number of spot welding points of the positive tab is 3 points, and the battery internal resistance of this battery is 18mΩ. The battery is discharged under the discharge current conditions of 0.2 rate (0.5 ampere), 1 rate (2.5 ampere), and 20 rate (50 ampere). The 0.2 rate discharge capacity can reach 86% of the nominal capacity, the 1 rate discharge capacity can reach 67% of the nominal capacity, and the 20 rate discharge capacity is zero.

[0058] The preparation method of the above secondary battery is shown in Example 1.

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Abstract

The invention relates to a secondary battery, in particular to a secondary battery with high-ratio discharge characteristics and a production method of the secondary battery. The secondary battery with the high-ratio discharge characteristics comprises a positive pole and a battery shell, a negative electrode plate, a diaphragm and a positive electrode plate are arranged in the battery shell, one or more lugs are welded on the positive electrode plate in a spot manner and are connected with the positive pole, spot welding depth of the lugs on the positive electrode plate is required to be larger than or equal to 2mm, and the spot number of the lugs welded on the positive electrode plate in a spot manner is required to be larger than or equal to 4. The secondary battery has the advantages that spot welding contact surfaces of the lugs and the positive electrode plate sufficiently contact, connection resistance of the positive electrode plate and the lugs is low, and high-ratio discharge performance of the secondary battery can be well realized.

Description

technical field [0001] The invention relates to a secondary battery, in particular to a secondary battery with high-rate discharge characteristics and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of electronic equipment and its development towards portability and cordless, electronic equipment that uses secondary batteries has put forward more and more stringent requirements for secondary batteries, especially for the high rate of secondary batteries. Higher requirements, even some electronic equipment require the discharge rate of the secondary battery to be as high as 50C. How to improve the high-rate discharge characteristics of secondary batteries has become one of the current research focuses of secondary batteries. Numerous experts at home and abroad are devoted to how to further improve the high-current discharge performance of the positive nickel or negative electrode alloy of the secondary battery, in order...

Claims

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Application Information

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IPC IPC(8): H01M2/26H01M10/04
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 王白浪高明霞刘永锋陈靖冯冉
Owner 宇恒电池股份有限公司
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