METHOD FOR DETECTION OF SHORT CIRCUITS WITHIN AN ENERGY STORAGE DEVICE

摘要

A method for detecting a short circuit within an energy store. The method includeds registering a current which flows through the energy store, registering a first voltage which is made available by the energy store at a first time, registering a second voltage which is made available by the energy store at a second time following the first time, determining whether the energy store is in a state of charge, a discharge state or in an open-circuit state, executing a first detection step when the energy store is in an open-circuit state, a second detection step when the energy store is in a state of charge, and a third detection step when the energy store is in a discharged state, and determining whether a short circuit is present based on the first and second voltage.

主权项

1. A method for detecting a short circuit within an energy store, the method comprising:
registering a current (IC) which flows through the energy store, registering a first voltage (Un-1) which is made available by the energy store at a first time (tn-1), registering a second voltage (Un) which is made available by the energy store at a second time (tn) following the first time (tn-1), determining whether the energy store is in a state of charge, a discharge state or in an open-circuit state, on the basis of the registered first current (IC), executing a first, second or third detection step on the basis of the determined state of charge, wherein in the first detection step, which is executed when the energy store is in the open-circuit state, a short circuit is detected as being present if the second voltage (Un) is lower than the first voltage (Un-1) minus a first constant (ε1), in the second detection step, which is executed when the energy store is in a state of charge, a short circuit is detected as being present if the second voltage (Un) is lower than the first voltage (Un-1), and in the third detection step, which is executed when the energy store is in the discharge state, a short circuit is detected as being present if the second voltage (Un) is lower than the first voltage (Un-1) minus a differential voltage (ΔU).