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Title: Battery with recessed terminals and fuse
Description: Description:
BACKGROUND OF THE INVENTION The field of art to which this invention relates includes batteries, and more specifically batteries with current protection systems. Wet cell batteries are increasingly being used as portable sources of power in many applications. As such uses of batteries increase, efforts also are being made to protect the battery from misuse and make the battery safer to use. A common problem involved with the use of a battery is the grounding or short-circuiting of the current conductor leading from the battery to the device being powered. Thus, it is a principal object of my invention to provide protection in the event of grounding or short-circuiting of the cable. It is a further object of my invention to isolate the terminals to which the cable is connected from any strain resulting from tension applied to the cable. SUMMARY OF THE INVENTION In carrying out my invention in a preferred embodiment, there is provided a battery container with a cover. The cover includes a plurality of covered recesses connected by channels and a slot which communicates with one of the recesses. Terminals extend into two of the recesses. A two-conductor cable is connected to the terminals and extends out through the slot where it is held substantially in place due to a ninety degree bend in it caused by a member connected to the container and disposed in the slot. One of the conductors in the cable includes a replaceable fuse disposed in one of the recesses. The above and other objects, features and advantages of my invention will be more easily understood by persons skilled in the art when the detailed description is taken in conjunction with the drawing. BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a front quarter perspective view of a wet cell battery embodying my invention, FIG. 2 is a fragmentary front elevational view with the cap for the fuse recess in an open position, FIG. 3 is a fragmentary sectional view taken along line 3--3 of FIG. 1, FIG. 4 is a fragmentary plan view showing the terminal recesses and the fuse recess with the caps removed, FIG. 5 is a fragmentary sectional view taken along line 5--5 of FIG. 1, FIG. 6 is a fragmentary sectional view taken along line 6--6 of FIG. 1, FIG. 7 is an enlarged plan view of a terminal cap with attached member, FIG. 8 is a fragmentary end view showing the connection of the terminal cap and member of FIG. 7 to the battery case, FIG. 9 is a fragmentary sectional view taken along line 9--9 of FIG. 8, and FIG. 10 is a fragmentary sectional view taken along line 10--10 of FIG. 8 showing the position of the terminal cap and attached member just prior to connection of the cap to the battery cover. DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to the drawing, the reference numeral 20 denotes a wet cell battery of the lead acid type, although it will be apparent to persons skilled in the art that my invention is applicable to batteries other than the lead acid type. Battery 20 includes a case 22 which is made up of a container 24 to which a cover 26 is connected, preferably by heat sealing. Both container 24 and cover 26 preferably are polypropylene or other suitable acid-resistant plastics or materials. Container 24 has the shape of a parallelepiped and is divided into a plurality of cells 28 by cell walls 30 (best seen in FIG. 5). Disposed in each cell 28 is a pack 32 of interleaved positive and negative plates, like plates of one pack 32 being connected to like plates of a pack 32 in an adjacent cell 28 by means of an intercell connection such as described in U.S. Pat. No. 3,793,086. The negative plates of the pack in one end cell 28 are connected to a terminal post 34, as shown in FIG. 6. Similarly, the positive plates of pack 32 in the opposite end cell 28 are connected to a terminal post 36, as shown on FIG. 4. Each cell 28 is filled with dilute sulphuric acid or other suitable electrolyte sufficiently to cover the pack 32 of plates in the respective cell. Communication with the interior of each cell 28 is through an opening 38 (FIG. 6) in cover 26 which normally is closed by means of a removeable cover 40 which threadably engages opening 38. As is well known, lead acid batteries generate gases during operation, and so some provision must be made to vent these gases from the individual cells 28. In the present battery 20 this is accomplished by a series of vent members 42, one of which is disposed in each cell 28. Each vent member 42 includes an opening 44 which communicates the interior of cell 28 with the respective vent member 42. The various vent members 42 are interconnected by means of a manifold formed by a recess 46 in cover 26 and a cap 48 which covers recess 46. At one end of the manifold there is provided a passage 50 to which a flexible tube (not shown) may be conveniently attached in order to conduct the gases generated during operation of the battery away from the battery. Cover 26 includes a pair of recesses 52 and 54 into which the negative and positive terminal posts 34 and 36 extend, respectively, best shown in FIG. 4. Also provided in cover 26 is a recess 56 which is adapted to receive a fuse, as will be explained hereinafter. Running between recess 52 and recess 56 is a channel 58, and similarly a channel 60 runs between recess 54 and recess 56. Also, a slot 62 is cut in cover 26 between the outer edge thereof and recess 52. Slot 62 is aligned with a slot 64 cut in a flange 66 which extends outwardly from the side of container 24, best seen in FIGS. 8, 9 and 10. A pair of stops 68 integral with flange 66 and disposed adjacent each side of slot 64 are provided for a purpose to be explained shortly. Connected to terminal post 34 and 36 is a flexible two-conductor cable 70 provided with a suitable connector 72 at the end remote from the terminal post connections. Cable 70 includes an insulated conductor 74 which has a cast-on lead terminal ring 76 that is burned or welded to the lead terminal post 34 to provide an electrical connection between post 34 and conductor 74. It will be noted that terminal ring 76 is disposed within recess 52 and that conductor 74 runs from recess 52 out through slot 62. Similarly, cable 70 includes an insulated conductor 78 at one end of which there is a cast-on lead terminal ring 80 which is burned or welded to post 36 to provide an electrical connection between conductor 78 and terminal 36. Conductor 78 includes a fuse 82 which is disposed in recess 56 and removably held in place by a pair of spring clamp connectors 84. At this point it will be noted that terminal ring 80 is disposed within recess 54 and that conductor 78 extends from recess 54 through channel 60, recess 56, channel 58, recess 52 and slot 62 from which it emerges through slot 64, together with conductor 74 as cable 70. In the normal operation of battery 20 all of the recesses are covered by separate caps. Recess 54 is covered by a cap 86 which is connected to cover 26 by a plurality of pins (not shown) which extend from the bottom thereof and engage holes 88 in cover 26. Also, recess 56 is covered by a cap 90 which is connected to cover 26 by means of a plurality of pins 92 which project downwardly therefrom and engage suitable holes 94 in cover 26. Cap 90 is provided with a so-called "living hinge" at 96 which is formed by providing a reduced cross-sectional area at 96. Cover 90 is provided with a lock to hold it in the closed position shown in FIG. 3 by means of an inwardly extending flange portion 98 which engages a part of the bottom edge 100 of cover 26. Recess 52 is covered by cap 102 which is connected to cover 26 by a plurality of pins 104 and 106 which project downwardly therefrom and cooperate with a plurality of holes 108 and cover 26. Connected to cap 102 by a so-called "living hinge" 110 is a member 112 from which a pair of pins 114 extend at the end remote from hinge 110. Member 112 is arranged to be disposed in slots 62 and 64 with pins 114 engaging flange 66 and held by stops 68 so that the lower end of member 112 is pivotally anchored to container 24. With member 112 pivotally anchored to container 24 cap 122 is pivoted from the dotted outlined position shown in FIG. 9 to substantially the position shown in FIG. 10 where the edge 116 (FIG. 7) of cap 102 engages notches 118 in cover 26 adjacent each side of slot 62, as best seen in FIG. 10. Cap 102 is then pivoted further downwardly from the position shown in FIG. 10 to the solid line position shown in FIG. 9 where pins 104 and 106 engage holes 108. It will be noted that pins 106 are somewhat shorter than pins 104 in order to facilitate engagement with holes 108. When cap 102 is in the position shown in FIG. 9 member 112 is in the solid line position also shown in FIG. 9 and functions to interfere with cable 70 so that it is forced downwardly through slots 62 and 64, as shown, in a substantially ninety degree bend. As a consequence cable 70 is held substantially in place and any tension that is applied to cable 70, as might occur if someone were to attempt to carry battery 20 by cable 70, will be preventing, at least partially, from being transmitted to the connection between conductor 74 and lead ring 76. This is desirable because while the electrical integrity of the connection between lead ring 76 and conductor 74 may be good, the mechanical integrity may be poor with the result that if substantial tension applied to cable 70 is fully transmitted to the connection between conductor 74 and lead ring 76, it may fail. At this point it will be noted that I have provided a battery which is protected by a recessed and covered fuse and recessed and covered terminals and conductors so that if there is a short circuit or a ground to the exposed portion of cable 70, the battery will be protected by fuse 82. The above detailed description is intended to be illustrative only. My invention is subject to various modifications, changes and the like without departing from the scope and spirit of it. Consequently, the limits of my invention should be determined from the claims appended hereto. Other info: Inventors: Slautterback, Robert C. (Toledo, OH, US) Application Number: 586432 Filing Date: 1975-06-12 Publication_date: 1976-02-10 Assignee: Eltra Corporation (Toledo, OH) Primary Class(es): 429/7 429/179 Other Classes: US Patent Ref:
Other Refs: Primary Examiner: Walton, Donald L. Assistant Examiner: Attorney: Johnson; Robert H. |
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