Unlock instant, AI-driven research and patent intelligence for your innovation.

Battery

A technology for batteries and battery casings, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of increased heat generation and high resistivity of the negative lead, and achieve the effect of ensuring safety

Inactive Publication Date: 2011-03-02
PANASONIC CORP
View PDF2 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the resistivity of nickel is relatively large (6.84μΩ·m), when the output of the battery increases and a large current flows through the negative lead, the amount of heat generated on the negative lead increases.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Battery
  • Battery
  • Battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0060] figure 1 It is a cross-sectional view of a general wound cylindrical lithium ion secondary battery.

[0061]The wound cylindrical lithium ion secondary battery includes an electrode group 4 . The electrode group 4 has a positive electrode 1, a negative electrode 2 disposed opposite to the positive electrode 1, and a porous separator (porous insulating layer) 3 interposed between the positive electrode 1 and the negative electrode 2 and preventing the direct contact between the positive electrode 1 and the negative electrode 2. It is formed by winding the negative electrode 2 with the separator 3 interposed therebetween. Such an electrode group 4 is housed in an iron battery case 10 together with a non-aqueous electrolyte (not shown) having lithium ion conductivity. Inside the battery case 10 , the electrode group 4 is sandwiched between the upper insulating plate 7 and the lower insulating plate 8 , and the separator 3 is impregnated with a nonaqueous electrolyte. An...

Embodiment approach 2

[0096] In the battery of Embodiment 2, the resistance of the positive electrode lead 5 is higher than that of the negative electrode lead 6 .

[0097] Figure 6 It is a plan view showing a state where the positive electrode lead 5 is welded to the exposed portion 11 of the positive electrode current collector 1A in the present embodiment.

[0098] The positive electrode lead 5 in this embodiment is welded to the exposed portion 11 of the positive electrode current collector 1A at a position closer to the first side 11a of the positive electrode current collector 1A than in the prior art. In other words, the positive electrode lead 5 is welded to the exposed portion 11 of the positive electrode current collector 1A at a position closer to the first portion 5 a than in the prior art.

[0099] When an external short circuit occurs in the lithium ion secondary battery of this embodiment, heat is generated in the positive electrode lead 5 and the negative electrode lead 6 . It is...

Embodiment 1

[0111] (a) Preparation of positive electrode

[0112] 3 kg of lithium cobaltate (positive electrode active material), "#1320 (trade name)" (NMP (N-methylpyrrolidone) containing 12% by weight of PVDF) produced by Kureha Chemical Co., Ltd. : positive electrode binder) 1kg, acetylene black (conductive agent) 90g and an appropriate amount of NMP were stirred to prepare the positive electrode mixture slurry.

[0113] This positive electrode mixture slurry was applied to both surfaces of an aluminum foil (thickness: 15 μm: positive electrode current collector). At this time, the positive electrode mixture slurry was not applied to the portion of the aluminum foil where the positive electrode lead was to be welded (exposed portion of the positive electrode current collector). The positive electrode mixture slurry was dried to obtain a laminate in which the positive electrode mixture slurry was coated on both sides of the aluminum foil. This laminate was rolled with rolls to produce...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Areaaaaaaaaaaa
Thicknessaaaaaaaaaa
Widthaaaaaaaaaa
Login to View More

Abstract

A battery wherein an electrode group (4) and an electrolyte solution are both sealed in a battery case (10). In the electrode group (4), a positive electrode (1) and a negative electrode (2) are wound together or laminated with a separator (3) being interposed therebetween. At least one of the positive electrode (1) and the negative electrode (2) has a collector (2A) and an active material layer (2B), and an exposed portion (21) of the collector (2A) is electrically connected with a lead (6). The lead (6) is so arranged as to extend from the exposed portion (21) to the outside of the collector (2A) across a first side (21a), which is one side constituting the exposed portion (21), and welded to the exposed portion (21) at a position near the first side (21a).

Description

technical field [0001] The invention relates to a battery, in particular to a battery with lead wires. Background technique [0002] Generally, in a chemical battery such as a lithium ion secondary battery, an electrode group is housed in a metal case or a laminated sheet. In the electrode group, the positive electrode and the negative electrode are wound or stacked through a separator, and the separator has the function of isolating the positive electrode and the negative electrode from each other and retaining the electrolyte. The metal case or the laminated sheet is sealed by a sealing member. Such chemical batteries sometimes further have a positive electrode lead and a negative electrode lead. Next, taking a cylindrical battery and a prismatic battery as examples, an example of the structure of the positive electrode lead and the negative electrode lead of each battery is shown. [0003] In the cylindrical battery, the positive electrode lead extends from the positiv...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H01M2/26H01M10/40H01M50/534H01M50/536
CPCH01M4/661H01M10/0525H01M2/22Y02E60/122H01M10/0431H01M4/70Y02T10/7011H01M10/0587H01M2004/027H01M2/26Y02E60/10H01M50/528H01M50/534H01M50/536H01M50/543H01M50/531Y02T10/70
Inventor 藤川万乡横山智彦岛田干也
Owner PANASONIC CORP