Control module connected to battery module
A control module is arranged side by side with a battery module. The control module includes a bus bar by which the battery module and an electric load are electrically connected to each other; a switch by which an electrical connection between the bus bar and the electric load is switched on and off; a current sensor by which a current of the bus bar is detected; and a shielding part. The current sensor detects current passing through the bus par by converting, to an electrical signal, a magnetic field generated by the current passing though the bus bar. The switch generates a magnetic field to switch over connections between the bus bar and the electric load based on the generated magnetic field. The shielding part is arranged between the current sensor and the switch.
1. A control module that is arranged side by side with a battery module including battery stacks in which a plurality of battery cells are arranged in a longitudinal direction that is orthogonal to a height direction ranging from an upper end surface on which electrodes of the battery cells are provided, to a lower end surface that is disposed at an opposite side of the upper end surface, the control module comprising:
a bus bar by which the battery module and an electric load are electrically connected to each other;
a case having a ceiling wall;
a switch by which an electrical connection between the battery module and the electric load via the bus bar is switched on and off, the switch being configured to generate a magnetic field to switch over connections between the bus bar and the electric load based on the generated magnetic field, the switch being disposed within the case, the switch including:
magnets which generate a magnetic force spatially bending a flow of a discharge current caused when an electric connection between the battery module and the electric load changes from an electrically connected state to an electrically disconnected state, the magnets being magnetized in a lateral direction that is orthogonal to the height direction and the longitudinal direction respectively, and the magnets being located on opposite sides of the bus bar in the lateral direction so that a magnetic flux generated by the magnets crosses the bus bar;
a first shielding part disposed within the case; and
a current sensor which is positionally arranged to be opposed to the magnets of the switch in the longitudinal direction, the current sensor being configured to detect current passing through the bus bar, the current sensor being disposed within the case, the current sensor including:
a magnetoelectric conversion element converting, into an electrical signal, the magnetic field in the longitudinal direction, and
a second shielding part which is positionally arranged to be opposed to the magnetoelectric conversion element in the height direction, the second shielding part suppressing the magnetic field in the height direction passing through the magnetoelectric conversion element,
wherein the first shielding part is arranged between the current sensor and the switch, extends from the ceiling wall of the case, is separated from the bus bar, and has a groove, with the bus bar passing through the groove.
2. The control module according to claim 1 , further comprising:
a control unit receiving the electrical signal from the current sensor to control the switchover of the switch; and
a connection terminal electrically connecting the current sensor and the control unit,
wherein the current sensor includes a connection portion connected with the connection terminal, the connection portion being located closer to the control unit than a connection portion of the switch is, the bus bar being connected with the connection portion of the switch.
3. The control module according to claim 2 , wherein
the bus bar has a first connection end connected to the electric load and a second connection end connected to the battery module, wherein the first connection end is located closer to the control unit than the second connection end is in the height direction;
the switch is provided in the bus bar connected to the second connection end; and
the current sensor is provided in the bus bar connected to the first connection end.
4. The control module according to claim 2 , wherein
the bus bar is located facing the upper side surface of the battery cell in the height direction and the control unit is located facing the lower side surface of the battery cell in the height direction; and
the switch is located between the bus bar and the control unit in the height direction.
5. The control module according to claim 1 , wherein
the battery module includes a plurality of the battery stacks and a plurality of battery-side ventilation holes through which wind flows to the plurality of the battery stacks; and
the case is arranged between two battery-side ventilation holes among the battery-side ventilation holes, the two battery-side ventilation holes being provided in a lateral direction perpendicular to both the longitudinal direction and the height direction.
6. The control module according to claim 1 , further comprising a mounting part containing a part or whole of the bus bar, the switch, the current sensor, and the first shielding part; wherein
the battery module is provided with a plurality of the battery stacks arranged in the lateral direction perpendicular to both the longitudinal and height directions;
the mounting part includes a plurality of control-side ventilation holes through which wind flows to the plurality of the battery stacks, the plurality of control-side ventilation holes being formed in a lateral direction perpendicular to both the longitudinal and height directions; and
a part or whole of the bus bar, the switch, the current sensor, and the first shielding part are arranged between two of the plurality of control-side ventilation holes which are present in the lateral direction.
7. The control module according to claim 6 , wherein
the mounting part includes input/output terminals through which power is inputted or outputted to or from the battery stack, and a notch for the bus bar;
wherein the notch is located to face the upper side surface of the battery cell in the height direction, and the control-side ventilation hole is located closer to the lower side surface to the battery cell than the notch is, in the height direction.
8. The control module according to claim 1 , further comprising:
a control unit receiving the electrical signal from the current sensor to control the switchover of the switch; and
a connection terminal electrically connecting the current sensor and the control unit,
wherein the current sensor includes a connection portion connected with the connection terminal, the connection portion being located closer to the control unit than a connection portion of the switch is, the bus bar being connected with the connection portion of the switch.
9. The control module according to claim 8 , wherein
the bus bar is located facing the upper side surface of the battery cell in the height direction and the control unit is located facing the lower side surface of the battery cell in the height direction; and
the switch is located between the bus bar and the control unit in the height direction.
10. The control module according to claim 8 , wherein
the bus bar has a first connection end connected to the electric load and a second connection end connected to the battery module, wherein the first connection end is located closer to the control unit than the second connection end is in the height direction;
the switch is provided in the bus bar connected to the second connection end; and
the current sensor is provided in the bus bar connected to the first connection end.
11. The control module according to claim 10 , wherein
the bus bar is located facing the upper side surface of the battery cell in the height direction and the control unit is located facing the lower side surface of the battery cell in the height direction; and
the switch is located between the bus bar and the control unit in the height direction.
12. The control module according to claim 8 ,
wherein the control module is arranged side by side with the battery module in the longitudinal direction, and is provided at an installation space under a seat of a vehicle including a generator as at least one of a power supply source and a power generation source.
13. A system mounted in a vehicle, the system comprising:
a battery module including battery stacks in which a plurality of battery cells are arranged in a longitudinal direction that is orthogonal to a height direction ranging from an upper end surface on which electrodes of the battery cells are provided, to a lower end surface that is disposed at an opposite side of the upper end surface; and
a control module that is arranged side by side with the battery module,
wherein the control module comprises
a bus bar by which the battery module and an electric load are electrically connected to each other;
a case having a ceiling wall;
a switch by which an electrical connection between the battery module and the electric load via the bus bar is switched on and off, the switch being configured to generate a magnetic field to switch over connections between the bus bar and the electric load based on the generated magnetic field, the switch being disposed within the case, the switch including:
magnets which generate a magnetic force spatially bending a flow of a discharge current caused when an electric connection between the battery module and the electric load changes from an electrically connected state to an electrically disconnected state, the magnets being magnetized in a lateral direction that is orthogonal to the height direction and the longitudinal direction respectively, and the magnets being located on opposite sides of the bus bar in the lateral direction so that a magnetic flux generated by the magnets crosses the bus bar;
a first shielding part disposed within the case; and
a current sensor which is positionally arranged to be opposed to the magnets of the switch in the longitudinal direction, the current sensor being configured to detect current passing through the bus bar, the current sensor including:
a magnetoelectric conversion element converting, into an electrical signal, the magnetic field in the longitudinal direction, and
a second shielding part which is positionally arranged to be opposed to the magnetoelectric conversion element in the height direction, the second shielding part suppressing the magnetic field in the height direction passing through the magnetoelectric conversion element,
wherein the first shielding part is arranged between the current sensor and the switch, extends from the ceiling wall of the case, is separated from the bus bar, and has a groove, with the bus bar passing through the groove.