Battery pack

A technology for battery packs and single cells, applied in battery electrodes, battery pack components, battery boxes/coatings, etc., can solve the problems of positive electrode thermal stability decline, lithium deintercalation, etc., and achieve simplified charge and discharge control and large tolerance , to ensure the effect of thermal stability

Inactive Publication Date: 2011-04-20
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In such a battery, if the battery is overcharged due to failure of the control device, etc., lithium will be further deintercalated, and the thermal stability of the positive electrode may be significantly reduced.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0148] The first cell (battery P1 ) and the second cell (battery Q1 ) were manufactured in the following procedure.

[0149] (A) Fabrication of battery P1

[0150] (1) Production of positive electrode

[0151] [Ni 1 / 3 mn 1 / 3 co 1 / 3 ](OH) 2 with LiOH·H 2 O After thorough mixing, form the mixture into granules. In the atmosphere, the particles were calcined at 1000 °C for 6 hours to obtain LiNi as the positive electrode active material 1 / 3 mn 1 / 3 co 1 / 3 o 2 .

[0152] Add N-methyl-2-pyrrolidine in the mixture of 88 parts by weight of positive electrode active material, 6 parts by weight of acetylene black as conductive material and 6 parts by weight of polyvinylidene fluoride (PVdF) as binder Ketone (NMP) to obtain positive electrode slurry. This positive electrode slurry was coated on a positive electrode current collector made of aluminum foil. After coating, it was dried at 100° C. for 30 minutes, and then dried at 85° C. for 14 hours under vacuum to obtain a pos...

Embodiment 2

[0176] Artificial graphite is used as the negative active material, the thicknesses of the positive and negative electrodes are set to 0.140mm and 0.175mm respectively, and the densities of the positive and negative electrodes are set to 2.88g / cm 3 and 1.2g / cm 3 . The ratio (Q(p) / Q(n)) of the positive electrode capacity to the negative electrode capacity was 0.94. Copper foil was used as the negative electrode current collector. Except for the above, a battery P2 (first cell) was produced by the same method as the battery P1 of Example 1.

[0177] Artificial graphite is used as the negative active material, the thicknesses of the positive and negative electrodes are set to 0.150mm and 0.109mm respectively, and the densities of the positive and negative electrodes are set to 2.60g / cm 3 and 1.2g / cm 3 . The ratio (Q(p) / Q(n)) of the positive electrode capacity to the negative electrode capacity was 0.94. Copper foil was used as the negative electrode current collector. A ba...

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Abstract

Disclosed is a battery pack formed by combining two types of secondary batteries that have different battery characteristics (charge voltage behavior) and that is equipped with a positive electrode, a negative electrode, a separator provided between the positive and negative electrodes, and a non-aqueous electrolyte. That is, the present invention relates to a battery pack in which at least one first single cell and at least one second single cell are electrically connected in series. The second single cell exhibits greater variation in the charge voltage at the end of the charging period and has greater battery capacity than the first single cell. In this way, a battery pack that has excellent long-term reliability that can safely prevent overcharging can be obtained.

Description

technical field [0001] The present invention relates to a battery pack using a plurality of single cells. Background technique [0002] Conventionally, lead-acid batteries having excellent high-rate discharge characteristics have been widely used as starting batteries for automobiles and backup power sources for various industries and businesses. In addition, application in EV (electric vehicle) or HEV (hybrid electric vehicle) is also being studied. [0003] However, in recent years, green nickel-metal hydride batteries or lithium-ion secondary batteries, which have higher energy density than lead batteries and do not use lead, have been used as backup power sources in order to reduce the size of the power supply and reduce the environmental load. Non-aqueous electrolyte secondary battery. [0004] Lead storage batteries are still widely used as batteries for starting automobile engines, but lithium-ion secondary batteries have been studied as a power supply for idling br...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/10H01M4/48H01M4/50H01M4/52H01M4/58H01M4/66H01M4/485H01M4/505H01M4/525H01M10/052H01M50/119
CPCY02E60/122H01M4/485H01M4/5825H01M2/0275H01M4/505H01M2/1016H01M4/661H01M2/0267H01M2004/021H01M4/525Y02E60/10H01M50/119H01M50/20H01M4/48H01M4/58H01M4/66
Inventor 名仓健祐
Owner PANASONIC CORP
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