Power storage system and cell protection method which protects the cell by both cutting from the cell pack and the cell pack from the system
First Claim
1. A power storage system provided with a secondary cell pack and further including a system protection unit having a system protection function that cuts the electrical connection between said secondary cell pack and the outside of said power storage system;
- wherein;
said secondary cell pack comprises a secondary cell and a cell protection unit having a cell protection function that cuts the electrical connection between said secondary cell and the outside of said secondary cell pack;
said cell protection unit monitors a state value that indicates the state of said secondary cell and controls execution of said system protection function and said cell protection function based on said state value;
said cell protection unit executes said system protection function or said cell protection function based on said state value when said state value diverges from a normal range that has been determined in advance;
when said state value diverges from said normal range, said cell protection unit executes said system protection function or said cell protection function based on change of said state value when said state value is within a warning range that is adjacent to said normal range, and executes said cell protection function when said state value is within a cell halt range that is adjacent to said warning range and is not within said normal range; and
when said state value is within said warning range, said cell protection unit predicts a halt postponement time that extends until protection of said secondary cell becomes necessary based on change of said state value, executes said system protection function when said halt postponement time is longer than a system halt delay time that was determined in advance, and executes said cell protection function when said halt postponement time is equal to or less than said system halt delay time.
3 Assignments
0 Petitions
Accused Products
Abstract
This power storage system is provided with a secondary cell pack and a system protection unit having a system protection function of cutting off the secondary cell pack from the outside of the power storage system. This secondary cell pack is provided with a secondary cell and a cell protection unit having a cell protection function of cutting off the secondary cell from the outside of the secondary cell pack. The cell protection unit further monitors a state value that indicates the state of the secondary cell and controls implementation of the system protection function and the cell protection function on the basis of the state value.
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Citations
8 Claims
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1. A power storage system provided with a secondary cell pack and further including a system protection unit having a system protection function that cuts the electrical connection between said secondary cell pack and the outside of said power storage system;
- wherein;
said secondary cell pack comprises a secondary cell and a cell protection unit having a cell protection function that cuts the electrical connection between said secondary cell and the outside of said secondary cell pack; said cell protection unit monitors a state value that indicates the state of said secondary cell and controls execution of said system protection function and said cell protection function based on said state value; said cell protection unit executes said system protection function or said cell protection function based on said state value when said state value diverges from a normal range that has been determined in advance; when said state value diverges from said normal range, said cell protection unit executes said system protection function or said cell protection function based on change of said state value when said state value is within a warning range that is adjacent to said normal range, and executes said cell protection function when said state value is within a cell halt range that is adjacent to said warning range and is not within said normal range; and when said state value is within said warning range, said cell protection unit predicts a halt postponement time that extends until protection of said secondary cell becomes necessary based on change of said state value, executes said system protection function when said halt postponement time is longer than a system halt delay time that was determined in advance, and executes said cell protection function when said halt postponement time is equal to or less than said system halt delay time. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- wherein;
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8. A cell protection method realized by a power storage system that is equipped with a secondary cell pack, comprising:
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monitoring a state value that indicates the state of said secondary cell; and based on said state value, controlling the execution of a system protection function that cuts the electrical connection between said secondary cell pack and the outside of said power storage system and a cell protection function that cuts off a secondary cell provided in said secondary cell pack from the outside of said secondary cell pack; wherein said system protection function or said cell protection function is executed based on said state value when said state value diverges from a normal range that has been determined in advance; wherein when said state value diverges from said normal range said system protection function or said cell protection function is executed based on change of said state value when said state value is within a warning range that is adjacent to said normal range, and said cell protection function is executed when said state value is within a cell halt range that is adjacent to said warning range and is not within said normal range; and wherein when said state value is within said warning range, predicting a halt postponement time that extends until protection of said secondary cell becomes necessary based on change of said state value, and executing said system protection function when said halt postponement time is longer than a system halt delay time that was determined in advance, and executing said cell protection function when said halt postponement time is equal to or less than said system hail delay time.
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Specification