FR2514951A1 - IMPROVED WATERPROOF BATTERY - Google Patents

Abstract

THIS BATTERY, INCLUDING AN EXTERNAL BOX 1 CONTAINING AN ELECTRODE ASSEMBLY 2 AND CONSTITUTING A TERMINAL OF ONE POLARITY, AND A METAL CLOSING COVER 3 TO CLOSE THIS BOX, A TERMINAL 8 OF ANOTHER POLARITY BEING INTRODUCED THROUGH THE INSULATING GASKETS 6, 7 IN A HOLE 4 SHAPED IN THE COVER 3, THIS COVER AND THE SAID GASKETS BEING HELD BETWEEN A METAL WASHER 11 ARRANGED ON A TAIL 10 protruding from the said terminal and a collar from the said terminal, present at least one protrusion OF ANNULAR SHAPE 5, 13 PRESSED INTO SAID INSULATING GASKETS 6, 7, THIS PROJECT BEING SHAPED ON ITS CLOSING COVER 3, ON THE SAID COLLAR 9 OF THE TERMINAL, AND OR ON THE SAID METAL WASHER, THUS ENSURING AN EXCELLENT WATERPROOFING.

Description

The present invention relates to a watertight battery

  che, having a high reinforced tightness.

  A conventional waterproof battery includes an external case

  ne (b) constituting a terminal of a polarity and containing an electrode assembly (a), a metallic cover (c) for closing, as shown in FIG. 1, and the battery, closed, is provided with an arrangement sealing which is

  realized by introducing a terminal (g) of another polari-

  tee in a hole (d) of the cover (c), through fittings

  IO insulating tures (e) and (f), and by enlarging and

  weaving an upper part of an external projection (h) of the terminal (g) between a metal washer (i) disposed on the external projection (h) and an internal flange (j) of the terminal (g), thus fixing between them the cover (c)

  and the insulating seals (e) and (f).

  However, in such a waterproof construction, a

  part (c ') near the hole (d) of the cover (c) is placed

  te so as to ensure planar contact with the respective insulating linings (e) and (f) Consequently, if the crimping force exerted on the terminal (g) is increased, it may be dispersed on the planar surface of the part (c ') so that an electrolyte disposed in the electrode assembly can leak as shown by

arrows in Fig 2.

  The present invention aims to solve this problem and

  provides in particular a waterproof battery having an agency-

  sealant with reinforced tightness and

  preventing unwanted electrolyte leakage.

  The invention relates to a battery which comprises an external case constituting a terminal of a polarity and containing the electrode assembly, and a metal cover for closing said case, and means for fixing the cover and insulating fittings. between a metal washer arranged on a tail projecting from a terminal pin and a collar of said terminal by introducing a pin forming a terminal of another

  polarity in a hole in the cover through the linings

  insulating tures According to the invention there is provided a

  pile in which at least one projection of annular form

  re pressed into said insulating linings is formed

  on the cover, on the collar of said pin for-

  mant terminal and / or on the metal washer.

  The cell according to the invention is characterized in that

  that an annular projection of simple shape is pre-

  IO view on at least part of the above three elements

  so as to be pressed into the insulating fittings.

  As a result, since the crimping force is not dispersed over the entire contact surface between the cover and the insulating linings and is centered on said annular projection, the properties

  seals are greatly improved to prevent

expensive electrolyte leakage.

  We use more particularly waterproof batteries

  by incorporating them into Ce- electrical accessories

  during, according to the invention, by preventing the leakage of the electrolyte, the life of the batteries is extended, undesirable contact faults between the batteries and the contacts of the electrical accessories are prevented

  as well as the corrosion of these accessories and the decrease

operation of these.

  In the accompanying drawings given solely by way of example

  ples: Fig 1 is a sectional view of a sealed cell of known type;

  Fig 2 is a section view on a larger scale

the of the waterproof part;

  Fig 3 is a sectional view of an embodiment

  sation of a battery according to the invention in which an annular projection is provided both on a

  bezel of a terminal of another polarity than the box

  tier and on the edge of a hole in a metal cover;

  Fig 4 is a perspective view with cutaway

  partial view of a terminal of a different polarity than the case, seen from below; Figures 5 to 7 are sectional views of the sealed parts of the various embodiments of batteries according to the invention in which an annular projection is provided on the edge of a hole in a metal cover Io closing the housing or in the vicinity of a hole in this cover;

  Fig 8 is a sectional view of a portion of étan-

  cheity of a battery according to another embodiment of the invention, in which an annular projection I 5 is provided on the collar of a terminal having a different polarity than the shoemaker;

  Fig 9 is a sectional view of a portion of étan-

  stack sheafness according to yet another embodiment

  in which an annular projection is

  provided only on a metal washer.

  The battery according to the invention is characterized in that at least one annular projection is provided on a metal cover closing the housing, on a

  collar of a terminal of another polarity than the bol-

  tier and / or on a metal washer.

  This annular projection is a projection

  circular continuous which is provided on a surface intended

  born to press an insulating gasket if we consider for example a metal closing cover, and it presents in section a configuration either at the top

  pointed or slightly rounded corner In addition, the height

  the protrusion is chosen appropriately so that this height is less than the thickness of the insulating lining In addition the protrusion can be

  formed by simple machining as will emerge from the

following cry.

  We will now describe different embodiments

  tion of the batteries according to the invention with reference to the

  not annexed. There is shown in Fig 3 a first arrangement

  characteristic of the battery according to the invention, in the-

  which the annular projection is provided in two

  of the three elements described above, this mode of realization

  IO sation comprising annular projections formed both on the flange of a terminal and on the edge of

  the opening of the metal closing cover, so

  çon that these projections extend in opposite directions, and there is shown in Fig 4 such a terminal, used for I 5 this battery In Fig 3 and 4, the reference 1 designates an external housing serving as terminal of a polarity, which includes the electrode assembly 2 and is covered by a closing cover 3, made of metal In this example,

  the edge of the boot 1 opening and the circumferential edge

  of the closing cover 3 are welded together

  using laser welding The iron cover 3

  meture has a central opening 4, and an annular projection directed upwards is formed on

  the edge of this opening A terminal 8 of another pola-

  rity is introduced into the opening 4 through upper and lower insulating linings 6 and 7 Terminal 8 has a flange 9 and is introduced into

  the opening 4 in such a way that the collar is so-

  killed outside, in this embodiment A round-

  of which 1 l of metal is disposed on a tail 10 projecting from the terminal 8 which extends downward through said opening 4 When the upper part of the tail 10 is crimped, the insulating fittings 6 and 7 arranged on the upper and lower parts of the circumference 12 of the opening 4 are held by

  the flange 9 and the washer 11 made of metal.

  In this embodiment, the fact that a projection

  13 of annular shape is also provided on the adhesive-

  rette 9, as shown in Fig 4, this projection

  sinks into the insulating packing 6 during crimping

  ge As a result, part 14 of the insulating packing 6

  which is located opposite the projection 13 of annular shape

  the air is strongly pressed on the cover 3 of

  IO closing by comparison with another party, preventing

  thus singing of leaks of liquid from the electrical assembly

  trode 2 along part 14 Because the projections

  13 and 5 of annular shape are pressed into the lining

  insulating structure 6, the leakage of liquid is prevented along the 5 5 of the two parts constituted by the projection 5 of

  annular shape and part 14, thus improving consider-

  sealingly the sealing In addition, it is possible to use, instead of the pin 8 forming a terminal, a pin forming a terminal comprising the flange at its lower end,

as shown in Fig 1 and 2.

  In addition, although the projections 5 and 13 of annular shape

  the space are provided both on the metal cover 3 for closing and the flange of a terminal 8 of another polarity, in the embodiment described above, these projections can be formed in an opposite manner both on the cover metallic closure 3 and the washer II in metal, or both on the flange of the terminal 8 of another polarity and on the washer 11 in metal. The insulating seals 6 and 7 are made of polyethylene, polypropylene, polyimide, silicone resin, fluorinated resin and others, which have a

  resistance to liquid electrolyte leakage, and pro-

  desired elasticity properties Physical properties such as elasticity, hardness and the like can be

  appropriately selected for batteries according to the in-

  vention These insulating pads can similarly be used in the following embodiments. As a battery according to the invention in which the annular projection is provided on one of the three elements described above, there will be described with reference to the appended drawings embodiments of IO batteries in which the annular projection is

  formed on the edge of the opening of the closing cover

  ture, or in the vicinity of this opening Figs 5 to 7

  are cross-sectional views of the seal parts

  suitability of these respective embodiments.

  I 5 Following the example of FIG 5, there is provided a projection 30 a of annular shape directed downwards on an edge 23 b of the opening of a cover 23 closing in

  using stamping or stamping techniques.

  When a part 28 projecting outwards from a

  terminal 27 with a different polarity of the cover is enlarged

  die and crimped, the annular projection 30 a is inserted into a lower insulating packing 25, thus preventing a leakage of liquid from the electrolyte of the assembly 21 to

through opening 24.

  The stack shown in Fig 6 has a projection

  has an annular shape which is arranged so as to extend

  dre upwards on the edge of an opening 33 b in an arrangement opposite to that shown in Fig 5 La

  projection 40 a of annular shape sinks into the lining

  re insulating upper 36 when crimping a pin

  37 forming a terminal, thus preventing leakage of the electrolyte.

  In a pile shown in Fig 7, a projection

  c of annular shape is provided on a part 43 a if-

  killed in the vicinity of an opening 44 of a closing cover 43 The projection 50 c is inserted into an insulating packing 45 during the crimping of a pin 47 forming

  terminal, preventing leakage of the electrolyte.

  The batteries according to the embodiments described have the advantage that the mechanical strength of the respective covers 23, 33 or 43 is increased + due to the presence of the projection 30 a, 40 a or 50 c of annular shape, respectively , and the fact that the projection is formed on the closure cover by

Io simple machining.

  In addition, several ring-shaped protrusions may

  can be formed on the closing cover The invention

  tion also includes an arrangement in which two annular protrusions for example are provided on

  I 5 a closing cover as shown in Fig 6 and 7.

  We will now describe with reference to Fig 8 which is a cross-sectional view of part

  sealing according to the invention, another embodiment of

  Lisation of a battery according to the invention in which the annular projection is formed only on the

  collar of the terminal pin.

  Referring to Fig 8, an annular projection 63

  is formed in a flange 59 of a terminal 58 of pola-

  rite opposite to the shoemaker, and sinks into an insulating lining 56 during crimping As a result, a part 64 of the insulating lining 56 located in front of the annular projection 63 is strongly pressed on a closing cover 53 relative to the other parts , thus preventing the electrolyte from leaking from the assembly 52 beyond the portion 64 In addition, the annular projection may be provided on one face of a metal washer 61 in contact with an insulating lining 57 instead of the

projection described above.

  Fig 9 is a sectional view of a cell according to yet another embodiment of the invention in

  which an annular projection 83 is provided only

  Lement on a metal washer 81.

  Finally, several annular protrusions can be formed on the collar of a terminal of another polarity than the shoemaker, and on the metal washer respectively. According to the invention as described above in IO in detail, the annular projection is provided on at least the metallic closure cover, the terminal collar of the opposite polarity and / or on the metal washer. , and the closing cover and the

  insulating seals are strongly pressed against each other

  I 5 be the others by inserting the projection into the insulating linings, thus preventing any leakage of electrolyte On

  as a result, it produces batteries with a -tightness-

very high.

Claims (4)

CLAIMS -   1. Battery of the type comprising an external case (1) comprising an electrode assembly (: 2) and constituting a terminal of a polarity, and a metal cover (3) of   closure to close said outer case (1), a terminal   ne (8) having another polarity, introduced through insulating linings (6, 7) into a hole (4) formed in said cover (3), this cover and said linings being held between a metal washer (11) disposed   on a tail (10) projecting from the terminal (8) and a collar   IO lerette (9) of said terminal, battery characterized in that it comprises at least one annular projection (5, 30 a, 40 a, 50 c, 13, 63, 83) pressed into said insulating linings, said projection being formed on the cover (3), on said collar (9) of the terminal (8)   I 5 and / or on said metal washer (81).   2. Battery according to claim 1, characterized in that said annular projections (5, 13, 63, 83,   a, 40 a, 50 c) are provided both on said collar-   te (9) of terminal (8) having the other polarity or on ladi-   the metal washer (81) and the edge of the hole in said cover   metal closing key or in the region near the edge of said cover hole, said annular projections   being directed in opposite directions towards each other.   3. Battery according to claim 1, characterized in that said annular projection (5, 30 a, 40 a, 50 c) is provided on the edge of said hole of the metal cover (3, 23, 33, 43) or on a part close to the edge of said hole. 4. Battery according to claim 1, characterized in that said annular projection (13, 63, 81) is formed on said flange of the terminal (8, 58) having   the other polarity or on said metal washer (81).