Method for manufacturing nickel-metal hydride secondary battery
A technology of secondary battery and manufacturing method, which is applied in the direction of secondary battery, alkaline storage battery, nickel storage battery, etc., can solve the problems of low activity of hydrogen storage alloy and reduced initial output power, etc.
Pending Publication Date: 2020-12-22
PANASONIC EV ENERGY CO LTD
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Problems solved by technology
[0003] In such a nickel-metal hydride secondary battery, the activity of the hydrogen storage alloy immediately after battery assembly is low, and the initial output tends to decrease.
Method used
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Embodiment Construction
[0042] refer to Figure 1 to Figure 9 , an embodiment of a nickel-hydrogen secondary battery manufactured by a method for manufacturing a nickel-hydrogen secondary battery will be described.
[0043] Such as figure 1 As shown, the nickel-hydrogen secondary battery is a sealed battery and is used as a power source for vehicles such as electric vehicles and hybrid vehicles. As a nickel-metal hydride secondary battery mounted on a vehicle, in order to obtain a required power capacity, there is known a rectangular sealed secondary battery composed of a battery module 11 in which a plurality of single cells 30 are electrically connected in series. formed by connection.
[0044] The battery module 11 has an integrated battery case 10 as a rectangular parallelepiped battery case, and the integrated battery case consists of a rectangular case 13 capable of accommodating a plurality of single cells 30 and a cover sealing the opening 16 of the rectangular case 13 . 14 poses. In addi...
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Provided is a method for manufacturing a nickel-metal hydride secondary battery, whereby it is possible to appropriately activate the battery. This method for manufacturing a nickel-metal hydride secondary battery includes an activation step in which an active material of a polar plate group is activated by charging and discharging after the polar plate group and an alkaline electrolyte are accommodated in a battery case of the nickel-metal hydride secondary battery. The activation step includes an activation charging step having at least one charge rest period before or during the start of charging. The upper limit value of the charging rate in the activation charging step is set to a charging rate at which the pressure of the gas generated by overcharging does not open the exhaust valveof the battery case. The total length of at least one charge rest period is set to a period in which the temperature of the nickel-metal hydride secondary battery is equal to or less than a predetermined temperature when the charging rate of the activation charging step is within a high charging range.
Description
technical field [0001] The present invention relates to a method for manufacturing a nickel-hydrogen secondary battery. Background technique [0002] Generally, nickel-metal hydride secondary batteries, which are secondary batteries with high energy density and excellent reliability, are widely used as power sources for portable devices, portable devices, and the like, and as power sources for electric vehicles or hybrid vehicles. A nickel-metal hydride secondary battery is composed of a positive electrode mainly composed of nickel hydroxide, a negative electrode mainly composed of a hydrogen-absorbing alloy, and an alkaline electrolyte. [0003] In such a nickel-metal hydride secondary battery, the activity of the hydrogen storage alloy immediately after battery assembly is low, and the initial output tends to decrease. Therefore, a technique of activating a hydrogen storage alloy has been proposed (for example, see Patent Document 1). [0004] In the technology described...
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IPC IPC(8): H01M10/28H01M10/30H01M4/26H01M4/32
CPCH01M10/28H01M10/281H01M10/286H01M10/287H01M10/288H01M10/30H01M4/26H01M4/32Y02E60/10Y02P70/50
Inventor 室田洋辅久保贵之木庭大辅前刀勇贵中野和城榎岛大介
Owner PANASONIC EV ENERGY CO LTD