Protective circuit and energy storage apparatus
AssigneeGS Yuasa International Ltd.
InventorsMasakatsu Fujimatsu, Kiyohiro Fujita, Shigeki Hattori, Akimasa Sugiura
Life of this patent
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Abstract
A protection circuit 60 is provided with: switches 61, 62 positioned on a power line PL of an electricity storage element 22 and a load 12; first protection elements 63, 64, 65 connected in parallel with the switches 61, 62 and absorbing surge caused when the switches 61, 62 open and cut off discharge current; and a second protection element 66 connected in parallel with the load and flowing, back to the load, the surge caused when the switches 61, 62 open and cut off the discharge current.
Claims13
An energy storage apparatus protective circuit comprising:
- a container provided with a pair of external terminals;
- an energy storage device housed in the container;
- and
- a protective circuit housed in the container and comprising:
- back-to-back connected FETs located on a power line from the energy storage device to the pair of external terminals;
- a first protective element that is connected in parallel to the FETs and absorbs a surge generated when the FETs are opened and discharge current is cut off;
- and
- a second protective element that is connected in parallel to a load, which is connected to the pair of external terminals and is outside the container, and returns the surge, which is generated when the FETs are opened and discharge current is cut off, to the load,
- wherein:
- the first protective element includes a plurality of the first protective elements including:
- a capacitor connected in parallel to the switch;
- and a Zener diode connected in parallel to the switch, and
- the energy storage apparatus has a rating of 12 volts.
An energy storage apparatus comprising:
- a container provided with a pair of external terminals;
- an energy storage device housed in the container;
- and
- a protective circuit housed in the container and comprising:
- back-to-back connected FETs located on a power line from the energy storage device to the pair of external terminals;
- a first protective element that is connected in parallel to the FETs and absorbs a surge generated when the FETs are opened and discharge current is cut off;
- and
- a second protective element that is connected in parallel to a load, which is connected to the pair of external terminals and is outside the container, and returns the surge, which is generated when the FETs are opened and discharge current is cut off, to the load,
- wherein the energy storage apparatus has a rating of 12 volts.
Dependencies are inferred from the claim text.