Battery pack with connecting device
A battery pack for an electric or hybrid vehicle having battery connectors for connecting batteries in series and a battery connector are disclosed that reduces the risks of potential electric shocks during assembly, servicing and in emergency situation. The battery connector includes an interrupter having disconnect capabilities in the event of the vehicle being involved in a collision.
1. A battery pack for electric or hybrid vehicle having multiple batteries connected in series by battery connectors, each battery having a positive and a negative pole; each battery connector comprising: a pair of battery pole covers made of an electrically insulating material mounted onto battery poles of two adjacent batteries, each battery pole cover having a receptacle area, an aperture providing access to the battery pole and a fastener having a conductive portion trapped inside the receptacle area of the pole cover and an electrically insulating portion extending outside the receptacle area; a connect-disconnect safety device having a conductive element made of an electrically conductive material inserted into the receptacle area of the pole covers for electrically connecting the positive and negative pole of two adjacent batteries via the fastener of each pole cover, and an interrupter, a central portion of the conductive element passing through the interrupter, the interrupter including a pyrotechnic charge and a mechanical cutter adapted to cut the central portion of the conductive element in the event of the vehicle being involved in a collision, thereby disconnecting the series connection of the batteries.
2. A battery pack as defined in claim 1 , wherein the interrupter includes a housing made of an electrically insulating reinforced plastic material.
3. A battery pack as defined in claim 1 , wherein the mechanical cutter includes a wedge aligned with the central portion of the conductive component which is actuated by the pyrotechnic charge that cuts the central portion of the conductive element permanently in the event of a collision.
4. A battery pack as defined in claim 1 , further comprising an igniter that set off the pyrotechnic charge triggered by an electrical signal received from an electronic control unit (ECU) of the vehicle sensing a collision.
5. A battery pack as defined in claim 1 , wherein each fastener of the pair of fastener is positioned inside one of the battery pole covers, each fastener including a threaded portion made of metal and an electrically insulated portion made of a non-conductive material.
6. A battery pack as defined in claim 1 , wherein each battery pole cover includes a first portion adapted for mounting onto the battery pole and a second portion assembled onto the first portion to define the receptacle area.
7. A battery pack as defined in claim 1 , wherein each battery pole cover is made of an electrically insulating plastic.
8. A battery connector for connecting a plurality of batteries in series to form a battery pack, the battery connector comprising: a pair of battery pole covers made of an electrically insulating material for mounting onto battery poles of two adjacent batteries, each battery pole cover having a receptacle area, an aperture for providing access to the battery poles and a fastener having a conductive portion trapped inside the receptacle area of the pole cover and an electrically insulating portion; a connect-disconnect safety device having a conductive element made of an electrically conductive material inserted into the receptacle area of the pole covers for electrically connecting the positive and negative pole of the two adjacent batteries via the fastener of each pole cover, and an interrupter, a central portion of the conductive element passing through the interrupter; the interrupter including a pyrotechnic charge and a mechanical cutter adapted to cut the central portion of the conductive element in the event of the vehicle being involved in a collision, thereby disconnecting the series connection of the batteries.