SAFETY SENSOR MODULE WITH VEHICLE COMMUNICATION TO FIRST RESPONDERS

Abstract

A battery system for a vehicle includes a battery pack having a structure defining a chamber receiving a battery. A first sensor is mounted to the structure for sensing an operating condition within the chamber. A safety module is disposed outside of the chamber. The safety module processes signals received from the first sensor to identify if the operating condition defines an abnormal condition occurring within the chamber. The safety module sends a first safety module signal when the signals received from the first sensor indicate the abnormal condition is present within the chamber.

Claims

1. A battery system for a vehicle, comprising: a battery pack having a structure defining a chamber receiving a battery; a first sensor mounted to the structure for sensing an operating condition within the chamber; and a safety module disposed outside of the chamber, the safety module processing signals received from the first sensor to identify if the operating condition defines an abnormal condition occurring within the chamber, the safety module sending a first safety module signal when the signals received from the first sensor indicate the abnormal condition is present within the chamber.

2. The battery system for a vehicle of claim 1, wherein the structure includes a frame having an outer wall defining a portion of the chamber, and the first sensor is attached to the outer wall.

3. The battery system for a vehicle of claim 2, wherein the first sensor is a smoke sensor mounted to the outer wall.

4. The battery system for a vehicle of claim 2, wherein the first sensor is gas sensor mounted to the structure.

5. The battery system for a vehicle of claim 2, wherein the outer wall is attached to a vehicle.

6. The battery system for a vehicle of claim 1, wherein the structure includes a bottom wall and the first sensor defines a moisture sensor positioned on the bottom wall.

7. The battery system for a vehicle of claim 6, wherein the bottom wall includes a low point, with the moisture sensor positioned at the low point.

8. The battery system for a vehicle of claim 1, wherein: the battery includes multiple battery cells, the structure includes a cross beam defining a plurality of sub-chambers each receiving at least one of the multiple battery cells, and the first sensor defines multiple identical sensors having individual ones of the multiple identical sensors mounted in each of the sub-chambers.

9. The battery system for a vehicle of claim 1, further including a second sensor mounted within the chamber detecting an operating condition within the chamber different from the operating condition sensed by the first sensor, the safety module sending a second safety module signal when the signals received from the second sensor define abnormal conditions present within the chamber.

10. The battery system for a vehicle of claim 9, further including a third sensor mounted outside of the chamber detecting a condition of the structure, the safety module processing signals from the third sensor to identify if an abnormal condition of the structure is present.

11. The battery system for a vehicle of claim 10, wherein the third sensor is included with the safety module.

12. The battery system for a vehicle of claim 2, wherein the safety module is mounted to the outer wall.

13. A battery system for a vehicle, comprising: a battery pack having a structure defining a chamber receiving a battery; a first sensor mounted to the structure sensing conditions of the structure; and a safety module disposed outside of the chamber, the safety module processing signals received from the first sensor, the safety module sending a safety module signal when the signals received from the first sensor indicate an abnormal condition of the structure.

14. The battery system for a vehicle of claim 13, wherein the first sensor defines an accelerometer mounted to the structure.

15. The battery system for a vehicle of claim 13, wherein the first sensor defines a strain sensor mounted to the structure.

16. The battery system for a vehicle of claim 13, wherein: the structure defines a frame having an outer wall defining the chamber; and the first sensor defines an impact sensor mounted to the structure.

17. The battery system for a vehicle of claim 16, wherein the safety module is mounted to the outer wall.

18. The battery system for a vehicle of claim 13, further including a second sensor mounted within the chamber detecting a condition within the chamber, the safety module further processing signals received from the second sensor to identify if an abnormal condition exists within the chamber.

19. The battery system for a vehicle of claim 18, further including a third sensor mounted outside the chamber detecting a second condition of the structure, the safety module further processing signals received from the third sensor to identify if an abnormal condition exists for the structure.

20. The battery system for a vehicle of claim 19, wherein the safety module includes the third sensor.

Description

DRAWINGS

[0028] The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way.

[0029] FIG. 1 is rear left perspective view of an automobile vehicle having a battery pack safety system for a battery powered vehicle according to an exemplary embodiment;

[0030] FIG. 2 is a top left perspective view of a battery pack of the present disclosure;

[0031] FIG. 3 is a cross sectional top plan view taken at section 3 of FIG. 2;

[0032] FIG. 4 is a top perspective view of area 4 of FIG. 3;

[0033] FIG. 5 is a cross sectional top plan view similar to FIG. 3;

[0034] FIG. 6 is a top left perspective view of area 6 of FIG. 5;

[0035] FIG. 7 is a cross sectional front elevational view taken at section 7 of FIG. 6;

[0036] FIG. 8 is a cross sectional top plan view similar to FIG. 3;

[0037] FIG. 9 is a top left perspective view of area 9 of FIG. 8;

[0038] FIG. 10 is a cross sectional top plan view similar to FIG. 3;

[0039] FIG. 11 is a diagrammatic presentation of the battery pack safety system for a battery powered vehicle according to an exemplary embodiment;

[0040] FIG. 12 is a front perspective view of the vehicle of FIG. 1; and

[0041] FIG. 13 is a bottom perspective view of area 13 of FIG. 2.

DETAILED DESCRIPTION

[0042] The following description is merely exemplary in nature and is not intended to limit the present disclosure, application, or uses.

[0043] Referring to FIG. 1, a vehicle battery safety sensor system 10 is incorporated with with a battery unit or battery pack 12 mounted to a vehicle 14. The battery pack 12 provides an electrical charge as the sole power to propel the vehicle 14, or may provide supplemental power in addition to an engine (not shown).

[0044] Referring to FIG. 2 and again to FIG. 1, the vehicle battery safety sensor system 10 together with the battery pack 12 are supported using a structural unit or frame 16 made for example from one or more materials such as a metal including aluminum, or a combination of materials such as a metal and a polymeric material or a composite material. The frame 16 may provide one or more mounting flanges 18 to connect the frame 16 to structure of the vehicle 14. The vehicle battery safety sensor system 10 further includes a stranded energy discharge module 20 permitting battery cell discharge in the event of an accident, and a battery emergency response module 22 which can provide signals locally or remotely for a vehicle and a battery emergency condition. The vehicle battery safety sensor system 10 further includes a safety module 24 which will be described in greater detail below.

[0045] Referring to FIG. 3 and again to FIG. 2, the battery pack 12 includes at least one and according to several aspects multiple battery cells 26. Each successive pair of the battery cells 26 may be separated by a dividing barrier or cross beam 28. In further aspects, the battery cells 26 are not separated by cross beams, but are positioned in an open cell space, bay or chamber. According to several aspects, a battery leak methane gas sensor 29 can be provided within the battery pack 12 at a location conducive to sensing methane gas from any of the individual battery cells 26.

[0046] According to several aspects, the vehicle battery safety sensor system 10 provides at least one and according to several aspects multiple sensors connected to the frame 16 supporting the battery pack 12, including at least one impact sensor connected to one of the walls of the frame 16, or may include multiple impact sensors each connected to one or more of the walls of the frame 16, such as a first impact sensor 30, a second impact sensor 32, a third impact sensor 34 and a fourth impact sensor 36. According to several aspects, one impact sensor such as the first impact sensor 30 is mounted to one of the side walls. According to further aspects, one of the first, second, third, and fourth impact sensors 30, 32, 34, 36 is individually mounted to each one of the side walls of the battery pack 12, to provide sensed impact values for each side of the battery pack 12. An output from the impact sensor or sensors, such as from each of the first, second, third, and fourth impact sensors 30, 32, 34, 36 is communicated to the safety module 24. Each of the impact sensors may be provided in the form of an accelerometer or a strain gage.

[0047] According to several aspects, in lieu of the first, second, third, and fourth impact sensors 30, 32, 34, 36 being mounted to each of the side walls, a single impact sensor 37 is located in the safety module 24. The impact sensor 37 may be a micro-electro-mechanical-system (MEMS) digital output motion sensor such as but not limited to an ultra-low power, high performance 3-axis FEMTO Accelerometer.

[0048] According to several aspects, the one or more impact sensors provide an output signal in response to a predefined structural loading applied to the frame 16. For example, when multiple impact sensors are provided, an output signal from any single one of the impact sensors may indicate a localized impact and damage to the area of the frame 16 where that impact sensor is mounted. An output from the impact sensors can be cumulatively collected as well. For example, a first predefined cumulative level of strain or impact energy may trigger an impact sensor output signal indicating damage less than total may require repair to the frame 16. Similarly, a second predefined cumulative level of strain may trigger an impact sensor output signal indicating a failure of the frame 16 has occurred. An output signal from the impact sensor 37 located in the safety module 24 may provide a collective loading of the frame 16, or in general a collective displacement of the battery pack 12.

[0049] Referring to FIG. 4 and again to FIG. 3, each of the impact sensors such as the exemplary fourth impact sensor 36 may be mounted to an outer facing wall 39 of the frame 16. The impact sensors can also be positioned differently than shown and therefore about any desired position of the frame 16.

[0050] Referring to FIG. 5 and again to FIG. 2, the frame 16 of the battery pack 12 may include a single large battery cell bay or chamber, or may include multiple battery cell bays or chambers such as an exemplary battery cell bay 38 which may be bounded between successive cross beams 28, such as between cross beams 28(1), 28(2). In order to collect any fluid leakage that may occur from the battery cells, and also to collect any moisture such a water that may enter the battery pack 12, each of the battery cell bays 38 can include a low point 40. Moisture or battery fluid entering the battery cell bays 38 collects at each low point 40 and is sensed by a moisture sensor 42 such as a water or battery fluid sensor positioned at the low point 40. When fluid is present and triggers an output signal, the output signal from each of the multiple moisture sensors 42 is communicated to the safety module 24. If desired, a particular battery cell bay 38 wherein one of the moisture sensors 42 triggers may be identified by the vehicle battery safety sensor system 10 of the present disclosure. Flow direction arrows 44 indicate a general flow direction of fluid toward the moisture sensors 42 from one side of the frame 16, and oppositely directed flow arrows 45 indicate a general flow direction of fluid toward the moisture sensors 42 from an opposite side of the frame 16. Although the moisture sensors 42 are depicted positioned substantially in a central location of each of the battery cell bays 38, the low points 40, and therefore the position of the moisture sensors 42 can be moved toward either side of the frame 16 from those shown.

[0051] Referring to FIG. 6 and again to FIG. 5, each of the moisture sensors 42 can be a singular sensor, or according to several aspects can be provided as a double sensor 46 as shown. The use of double sensors 46 provides redundancy and an increased accuracy in the sensed moisture level.

[0052] Referring to FIG. 7 and again to FIGS. 5 and 6, a bottom wall 47 of the frame 16 can be curved or pitched downwardly from each of successive ones of the cross beams 28, such as between cross beams 28(1), 28(2) toward the centrally located low point 40. The low point 40 can also be positioned to the left or to the right of the low point 40 as shown in FIG. 7 as desired, as well as toward or away from the viewer. According to several aspects a single low point 40 can also be provided for the entire frame 16, with weep holes 49 allowing fluid flow though each of the cross beams 28 to allow all fluid to collect in the single low point 40, and with a common pitch of the battery pack 12 such as at a one degree downward angle that aids in the flow of liquid to the low point 40.

[0053] Referring to FIGS. 8 and 9, and again to FIGS. 2 and 3, the vehicle battery safety sensor system 10 can further include one or more smoke sensors 48. The smoke sensors 48 can detect heat or smoke, and can be mounted to an inside wall 50 of the frame 16, for example at opposing inside corners of the frame 16. The output signal from each of the multiple smoke sensors 48 is communicated to the safety module 24.

[0054] Referring to FIG. 10 and again to FIGS. 2 through 9, in addition to the above noted battery leak methane gas sensor 29, the one or more of the first, second, third, and fourth impact sensors 30, 32, 34, 36, the impact sensor 37, the moisture sensors 42, and the smoke sensors 48, the vehicle battery safety sensor system 10 can further include one or more of each of a combination fire and smoke sensor 52, at least one battery fluid leak sensor 54 and at least one accelerometer 56. The output signals from all of the sensors of the battery pack 12 are communicated to the safety module 24, with the impact sensor 37 already present in the safety module.

[0055] Referring to FIG. 11 and again to FIGS. 1 through 10, an exemplary diagram of the vehicle battery safety sensor system 10 of the present disclosure includes the safety module 24 in communication with all of the sensors. The safety module 24 may provide computational capability and therefore may include features such as a memory including an EEPROM 58. The safety module 24 receives the output signals from each of the multiple sensors such as the battery leak methane gas sensor 29, the first, second, third, and fourth impact sensors 30, 32, 34, 36, the impact sensor 37 located within the safety module 24, the moisture sensors 42, the battery fluid leak sensors 54, and the accelerometers 56 and coordinates an output signal indicating a condition of the battery pack 12 and the frame 16. The safety module 24 is in communication with a vehicle main computer such as an electronic control unit (ECU) 60 via a high speed CAN interface 62. A connector 64 is provided with the safety system 10 providing power and communication terminals, including a high speed CAN 66 and a low speed CAN 68 for communication with the ECU 60. A safety module power supply 70 is also connected via the connector 64 to a positive power terminal 72 and a ground terminal 74, thereby providing backup power for operation of the safety module 24 if power from the battery pack 12 is unavailable.

[0056] A warning module 76 is also in communication with the vehicle ECU 60, such that when a signal is forwarded by the safety module 24 to the vehicle ECU 60 the vehicle ECU 60 may energize any one or all of multiple different vehicle external warnings, including sounding of a vehicle horn or a separate sound emitting device in a pattern indicative of a condition of the battery pack 12 such as a rapid on-off sounding of the horn, flashing of either or both of the vehicle headlights or rear tail-lights in a pattern indicative of a condition of the battery pack 12 such as a predetermined on-off sequence, a remote signal sent via a wireless signal device, an internal message directed to the operator of the vehicle 14 such as a text message indicating the condition of the battery pack such as for example a smoke condition or structural damage to the frame 16, and the like can be initiated in the event of an output signal being transmitted from any one of the sensors of the vehicle battery safety sensor system 10. The warning module 76 is in communication with the safety module 24, such that the warning module 76 when initiated by a signal from the safety module 24 energizes a signaling device described in reference to FIG. 12 providing external vehicle indication of a status of the battery pack 12.

[0057] Referring to FIG. 12 and again to FIGS. 1 and 11, if the vehicle 14 is in an accident or damage occurs to the frame 16, the vehicle battery safety sensor system 10 using the safety module 24 forwards signals from the various sensors to the vehicle ECU 60, which determines based on a condition of the vehicle 14 whether to provide external visual indication of the vehicle condition to a first responder by energizing operation of a signaling device such as but not limited to vehicle lights 78 such as the headlights and taillights. A predetermined pattern of light operation such as for example by blinking three times can indicate smoke in the battery pack 12 or a battery fire, or by blinking four times can indicate a battery leak. The signaling device can also define an external audible indication of the vehicle condition which can be provided by operation of a sound emitting device or vehicle horn 80. A first responder can also provide a stranded energy discharge device 82 and an energy discharge cable 84 which may be used to discharge the stored energy charge of the battery pack 12. Signals from the safety module 24 can be transmitted even in the event that the power supply from the 12 VDC battery pack 12 is cut by a first responder in an emergency.

[0058] Referring to FIG. 13 and again to FIGS. 3 and 12, because it must be assumed the battery pack 12 holds a charge, the stranded energy discharge module 20 of the battery pack 12 includes a power discharge port 86 which can be connected to the multiple battery cells 26 of the battery pack 12 via a passage created through the frame 16. Energy from the multiple battery cells 26 of the battery pack 12 can be bled off to the energy discharge device 82 via the energy discharge cable 84 which is adapted to connect directly to the power discharge port 86.

[0059] A vehicle battery safety sensor system 10 including a safety module 24 of the present disclosure offers several advantages. These include the provision of multiple different types of sensors directly in or supported on the frame 16 of the battery pack 12, each communicating with the safety module 24 to centrally collect any sensor output signals. The sensors provide indication of the condition of the battery pack 12 both to the vehicle operator such as to a center stack or to a speedometer gage cluster, and to parties passing the vehicle 14 and to a first responder if the vehicle 14 is in an accident or is stranded. The safety module 24 of the present disclosure provides a unified collector for all of the sensor output signals for subsequent communication with the vehicle ECU.

[0060] A signal generated by any of the sensors of the present disclosure indicates an abnormal condition present within the chamber or bay 38 of the frame 16, or present in the structure defining the frame 16. The abnormal condition can therefore be smoke or gas, fire, a liquid present within the bay 38, structural deformation resulting from strain loading, and the like.

[0061] The description of the present disclosure is merely exemplary in nature and variations that do not depart from the gist of the present disclosure are intended to be within the scope of the present disclosure. Such variations are not to be regarded as a departure from the spirit and scope of the present disclosure.