Protection circuit for battery module
AssigneeStl Technology Co., Ltd.
InventorsWen-Fan Chang, Chun-Chieh Li, Jung-Nan Chien
Life of this patent
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Abstract
The present invention provides a protection circuit applied to a battery module, which includes a self-control protector, a switch element and a voltage clamping loop; the self-control protector includes a fuse unit and a heater; when the switch element receives a control signal, the switch element will be turned on; when the switch element is turned on, the voltage clamping loop provides a clamp voltage to clamp a working current passing through the self-control protector within a current range where the fuse unit can be blown; and as such, the fuse unit of the self-control protector will be blown by the working current heating the heater.
Claims9
A protection circuit applied to a battery module, the battery module comprising a plurality of battery cells strung together, the protection circuit comprising:
- a self-control protector, comprising a fuse unit and a heater, wherein the fuse unit is connected to a power positive terminal of the battery module, and the heater is provided with one end connected to the fuse unit;
- a switch element, when the switch element receives a control signal, the switch element will be turned on;
- and
- a voltage clamping loop, connected to the battery module, the self-control protector, and the switch element, wherein the voltage clamping loop comprises:
- a first voltage dividing element, provided with one end connected to the power positive terminal of the battery module, and provided with other end connected to a first node;
- a second voltage dividing element, provided with one end connected to the first node, and provided with other end connected to a power negative electrode of the battery module via the switch element;
- a voltage clamping element, connected with the first voltage dividing element in parallel;
- and
- a power transistor, comprising a first terminal, a second terminal and a control terminal, wherein the first terminal of the power transistor is connected to the power negative electrode of the battery module, the second terminal of the power transistor is connected to other end of the heater, and the control terminal of the power transistor is connected to the first node;
- wherein the voltage clamping loop forms a clamp voltage when the switch element is turned on, the clamp voltage clamps a working current passing through the self-control protector within a current range where the fuse unit is blown, such that the fuse unit of the self-control protector is blown by the working current heating the heater;
- wherein when the switch element is turned on, the voltage clamping loop forms the clamp voltage between the power positive electrode of the battery module and the control terminal of the power transistor.
Dependencies are inferred from the claim text.