Cylindrical secondary battery
A secondary battery and conductivity technology, which is applied in secondary battery manufacturing, lithium storage batteries, battery pack components, etc., can solve problems such as difficulty in ensuring safety, unreliable release of battery gas, and inability to reduce battery internal pressure, etc., to achieve Effect of ensuring safety and reducing internal pressure
Inactive Publication Date: 2008-05-28
HITACHI AUTOMOTIVE SYST LTD
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- Abstract
- Description
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AI Technical Summary
Problems solved by technology
[0006] However, when increasing the capacity of the battery, in the above-mentioned explosion-proof mechanism, when an external force accompanied by rapid deformation acts on the battery, as shown in FIG. Phenomena on Cap 1
In this case, the cracking of the cleavage groove 28 formed on the side of the upper cap 1 of the separator 22 is hindered by the upper cap 1, resulting in unreliable gas release from the battery.
Therefore, there is a problem that the internal pressure of the battery cannot be lowered, and it is difficult to ensure safety.
Method used
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Embodiment 1
[0046] As shown in Table 1, in Example 1, a diaphragm 2 in which the depth a of the cleavage groove 8a is 0.10mm, the depth b of the cleavage groove 18 is 0.30mm, and the depth c of the end of the cleavage groove 8b is 0.30mm is used to produce The upper cover 20 is used to manufacture the lithium ion secondary battery 30 .
Embodiment 2
[0048] As shown in Table 1, in Example 2, a diaphragm 2 with a depth a of cleavage groove 8a of 0.15mm, a depth b of cleavage groove 18 of 0.25mm, and an end depth c of cleavage groove 8b of 0.25mm was used to manufacture The upper cover 20 is used to manufacture the lithium ion secondary battery 30 .
Embodiment 3
[0050] As shown in Table 1, in Example 3, a diaphragm 2 in which the depth a of the cleavage groove 8a is 0.20mm, the depth b of the cleavage groove 18 is 0.10mm, and the depth c of the end of the cleavage groove 8b is 0.10mm is used to produce The upper cover 20 is used to manufacture the lithium ion secondary battery 30 .
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A cylindrical secondary battery where safety can be secured even when an external pressure accompanying rapid deformation of the battery acts on the battery is provided in a battery having a large capacity. A lithium ion secondary battery has a capacity of 14Ah, where an upper lid is fixed to a battery can which receives an electrode winding group therein. The upper lid includes a diaphragm (2) formed with a rupturing valve and an upper lid cap whose peripheral edge portion is fixed to a peripheral edge portion of the diaphragm (2). The rupturing valve includes a rupturing groove (8) with a V-shaped section formed on a surface of the diaphragm (2) positioned on the side of the upper lid cap and a rupturing groove (18) with a U-shaped section formed on a surface of the diaphragm (2) positioned on the side of the electrode winding group so as to correspond to the position of the rupturing groove (8). The diaphragm (2) is inverted due to internal pressure rising in the battery so that a current is cut off. When an external force accompanying rapid deformation of the battery acts on the battery, force acting on the diaphragm (2) tends to concentrate on the rupturing groove (18).
Description
technical field [0001] The present invention relates to a cylindrical secondary battery, in particular to a cylindrical secondary battery having a mechanism for turning over a diaphragm due to an increase in internal pressure to cut off current, and having a cleavage valve formed on the diaphragm. Background technique [0002] Conventionally, sealed cylindrical secondary batteries have been widely used in home appliances. Recently, among sealed cylindrical secondary batteries, lithium secondary batteries in particular have been widely used. In addition, lithium secondary batteries are being developed as in-vehicle power sources for electric vehicles (EV) and hybrid vehicles (HEV) due to their high energy density. [0003] However, when a closed cylindrical secondary battery falls into an overcharged state due to a failure of the charging device or the like, gas may be generated during decomposition of the electrolytic solution, and the internal pressure of the battery may ri...
Claims
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IPC IPC(8): H01M2/34H01M2/12H01M2/00H01M10/04H01M50/167
CPCY02E60/12H01M2/1241H01M2/022H01M2/345H01M10/052Y02T10/7011H01M2/0413Y02E60/10H01M50/107H01M50/171H01M50/3425H01M50/578Y02P70/50H01M50/167
Inventor 三谷贵之铃木克典
Owner HITACHI AUTOMOTIVE SYST LTD
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