Battery assembly for secondary battery
A secondary battery and battery component technology, applied in secondary batteries, battery components, electrical components, etc., can solve the problems of lithium-ion secondary battery performance deterioration, inconvenient users, and laptop computers cannot work, etc.
Inactive Publication Date: 2004-06-02
MURATA MFG CO LTD
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Problems solved by technology
If the temperature of the lithium-ion secondary battery becomes 60°C or higher, the performance of the lithium-ion secondary battery will deteriorate
[0008] For example, if a user of a laptop computer or the like repeats heavy-load current discharge hundreds of times in a high-temperature atmosphere exceeding 35°C, the performance of the lithium-ion secondary battery deteriorates and the discharge capacity decreases by 20% or more
[0009] Conventionally, such a technique is well known that when the temperature of the lithium ion secondary battery becomes a temperature T1 such as 60° C. under discharge, the performance of the lithium ion secondary battery deteriorates, the discharge of the lithium ion secondary battery tends to be terminated, But when the discharge tends to be terminated at this temperature T1, the discharge will often be terminated, so the laptop will often fail to work, which is very inconvenient for the user
Method used
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no. 1 example 1
[0030] exist figure 1 and 2 , reference numeral 1 denotes a plastic case having flat, rectangular top surface 1a and bottom surface 1b, and six cylindrical lithium ion secondary batteries 2a, 2b, 2c, 2d, 2e, and 2f are housed in case 1 , each battery has a diameter of 18 mm, a length of 65 mm, and a discharge capacity of 1.8 Ah.
[0031] Every two of these six lithium ion secondary batteries 2a, 2b...2f are connected in parallel, and three pairs of such two batteries connected in parallel are connected in series, as image 3 shown. The positive and negative electrodes of the batteries connected in series are connected to the protective circuit 3 , and the external terminals 4 a and 4 b are drawn out from the protective circuit 3 . The protection circuit 3 has a protection function against overvoltage charging, overvoltage discharging, and overcurrent charging of the lithium ion secondary battery. In addition, the protection circuit 3 is necessary to prevent malfunction of ...
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In a battery pack including a plurality of secondary batteries within an outer case, any one of an adhesive, a gel filler, and a flat rubber sheet having a thermal conductivity of more than 0.4 W / mK (0.96x10-3 cal / cm.sec.° C.) is provided at a gap between the plurality of secondary batteries and the outer case.
Description
[0001] Cross References to Related Applications [0002] This application claims priority from Japanese Priority Document No. 2002-308797 filed in Japan Patent Office on October 23, 2002, which is incorporated herein by reference. technical field [0003] The present invention relates to a battery pack suitable for use in portable electronic devices such as laptop computers and the like. Background technique [0004] Generally, in a laptop computer, a battery pack including six cylindrical lithium-ion secondary batteries in a plastic case having a flat, rectangular top and bottom is employed as a power source. In a battery assembly including 6 cylindrical lithium ion secondary batteries in such a plastic case having flat, rectangular tops and bottoms, the part in which the lithium ion secondary batteries and the case are in direct contact is an elongated small In the region, air with poorer thermal conductivity exists in the gap between the lithium ion secondary battery and...
Claims
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IPC IPC(8): H01M2/02H01M2/08H01M2/10
CPCY02E60/12H01M2/1094H01M2/0277H01M2/0295H01M2/0272H01M2/0275Y02E60/10H01M50/1243H01M50/24H01M50/20H01M10/04H01M10/425H01M2220/30
Inventor 佐藤文哉
Owner MURATA MFG CO LTD