JP2009026711A - Storage battery equipped with monoblock battery case - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a storage battery equipped with a monoblock battery case in which there is no fluid leakage when the electrolytic solution is injected and in the case it is mounted on a vehicle and running or the like. <P>SOLUTION: Lower parts of respective barrier ribs 3 in the battery case 1 are descended downward bifurcated in two branches and formed into two-fold swollen barrier ribs 3a, 3a continuously connected to the battery case bottom wall, while on both side-faces of the upper part of the barrier ribs 3, a plurality stripes of vertical ribs 5, 5, ... are arranged and installed leaving spacings in its width direction, and vertical recessed grooves 6 are formed between the vertical ribs 5, 5, the lower parts of the both end faces of the electrode plate group 7 housed in the respective cell rooms 2 are pinched by the swollen barrier ribs 3a, 3a via the opposite swollen barrier ribs 3a, 3a or the vertical ribs 5, 5, and its upper parts are pinched by the opposite vertical ribs 5, 5, ... and 5, 5, .... <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a storage battery including a monoblock battery case.

Storage batteries, in particular, vehicle storage batteries for automobiles and motorcycles, etc., are divided into a plurality of cell chambers by a plurality of partition walls inside a monoblock battery case, and a group of electrode plates each having a strap and an intermediate pole column in each cell chamber The adjacent electrode plates are connected by welding between the opposite intermediate pole columns via the partition wall, positive from both ends, and the negative electrode column is positive through a lid that is gas-liquid tightly attached to the battery case. In addition, a negative terminal is used, and a certain amount of electrolyte is injected into each cell chamber. In recent years, the weight saving of this type of vehicle storage battery has been promoted, and the thickness of the electrode plate has been reduced. Yes. However, on the other hand, the size of the storage battery, that is, the outer dimension of the battery case is determined by regulations from the viewpoint of attachment to a vehicle. Therefore, when the electrode plate group assembled by stacking the electrode plates with a reduced thickness through the separator is accommodated in the cell chamber, a space is formed between both end surfaces in the stacking direction of the electrode plate group and the opposing partition walls of the cell chamber. And the electrode plate group cannot be clamped and fixed by the partition walls. In order to solve this problem, the following Patent Document 1 states that “a monoblock battery having a depth substantially corresponding to the height of the electrode plate and having a recess opened between the cells in the bottom of the battery case. A storage battery having a tank has been proposed.
Thus, according to this proposal, by providing the above-described concave portion between the cells of the monoblock, the weight can be reduced without changing the external dimensions. Thus, the “recess opening in the bottom of the battery case” specifically refers to the height of the electrode plate of the electrode plate group accommodated in the cell chamber, that is, the partition wall defining the cell chamber, that is, A double bulge that hangs down bifurcated from a height approximately equivalent to the height of the electrode plate group consisting of a laminate of positive and negative electrodes laminated via separators and is connected to the bottom wall of the battery case It can be seen from the description of the specification and the drawings that it is formed between the partition walls.
Japanese Utility Model Publication No. 52-108542

However, it has been found that when a storage battery is manufactured using the block battery case disclosed in Patent Document 1, the following disadvantages are brought about.
When injecting a predetermined amount of electrolyte into each cell chamber, it is often seen that the injected electrolyte leaks to the outside if it is quickly injected. Time consuming and poor work efficiency. The cause was that the pole columns on both end faces of the electrode plate group were sandwiched between opposing bulging partitions that were approximately the same height as the electrode plates, so that when a predetermined amount of electrolyte was rapidly injected, it was injected This is probably because the electrolytic solution does not quickly penetrate into the electrode plate group, stays in the upper space of the electrode plate group, and eventually overflows from the liquid injection port. Therefore, even after the injection, the electrolyte that often stays on the electrode plate group leaks out in the charging operation immediately after the injection, or when the storage battery is mounted on the vehicle and travels. It was confirmed that liquid leakage from the
An object of the present invention is to provide a storage battery including a monoblock battery case that solves such a conventional problem and prevents liquid leakage as described above.

According to the present invention, as described in claim 1, the lower part of each partition wall in the battery case is formed as a double bulging partition wall that is branched and dropped into two branches and connected to the bottom wall of the battery case, while the upper part of the partition wall A plurality of vertical ribs projecting to the same surface position as the bulging partition wall surface, or projecting from the bulging partition wall surface and suspended from both side surfaces of the bulging partition surface. A plurality of vertical ribs combined with an output partition wall, and a vertical concave groove is formed between the vertical ribs, and the bulging partition wall faces the lower portions of both end faces of the electrode plate group accommodated in each cell chamber Or it exists in the storage battery provided with the monoblock battery case characterized by being clamped by this bulging partition via a vertical rib, and having the upper part clamped by this opposing vertical rib.
Further, according to the present invention, as described in claim 2, in the present invention, both end walls in the stacking direction of the electrode plate group of the battery case are substantially equal to the height of the electrode plate group accommodated in the cell chambers at both ends. In the wall corresponding to the height, it is formed on the end wall bent and bulged inward, and a plurality of vertical grooves are formed on the inner surface of the bulged end wall at a predetermined interval in the width direction. It exists in the storage battery provided with the monoblock battery case characterized by the above.

According to the invention of claim 1, when the electrode plate group formed by laminating the thin positive and negative electrode plates with the separator interposed therebetween is accommodated in each cell chamber, the lower portions of the electrode plates on both end faces face the bulges facing each other. Since it is sandwiched between the bulging partition walls via the partition walls or the vertical ribs, and the upper part is sandwiched between the opposing vertical ribs, the electrode plate group can be fixed and the lightweight storage battery without changing the outer dimensions of the battery case In addition, when the electrolyte solution is injected into each intermediate cell chamber, the injected electrolyte solution is formed in a plurality of concave grooves formed between a plurality of vertical ribs pressed against both end faces of the electrode plate group. It flows down inside and penetrates into the electrode plate group from both sides, so that the electrolyte stays in the upper space of the electrode plate group and does not overflow to the outside. Further, when injecting the electrolyte into the cell chambers at both ends, the injected electrolyte flows down in the respective recessed grooves formed between the vertical ribs pressed against one end surface of the electrode plate group, and the electrode plate group As the electrolyte permeates from one side of the electrode plate, the electrolyte stays in the upper space of the electrode plate group and does not overflow to the outside. Can be completed quickly and smoothly, and the injection work efficiency can be improved. The electrolyte solution can be prevented from leaking when the battery is immediately charged after the injection or when the battery is mounted and traveled.
According to the invention of claim 2, not only can the electrode plates accommodated in the cell chambers at both ends of the battery case be sandwiched, but also the electrolyte injected into the cell chambers at both ends of the battery case is Each vertical groove formed on the bulging end wall pressed against the other side of the electrode plate group, in addition to flowing down the respective concave grooves between the vertical ribs pressed against one side surface of the group and penetrating from one side of the electrode plate group Since it flows down the concave groove and permeates from the other side of the electrode plate group, the effect of preventing leakage of the electrolyte during the injection of the electrolyte is increased.

An example of an embodiment of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a plan view of an example of a monoblock battery case of the present invention, FIG. 2 is a partially cut side view thereof, FIG. 3 is a bottom view thereof, and FIG.
In the drawing, A indicates a monoblock battery case produced by injection molding a synthetic resin such as polypropylene resin. The monoblock battery case A is composed of the battery case 1 having a rectangular quadrangular wall and five partition walls 3, 3,... Partitioning the inside into six cell chambers 2, 2,. It is the same structure as the conventional monoblock battery case. According to the present invention, the lower part of each partition wall 3 is formed into double bulged partition walls 3a, 3a that are branched and inclined bifurcatedly and then dropped and connected to the battery case bottom wall 1b. Accordingly, a recess 4 is formed between the double bulging partition walls 3a and 3a so as to open in the bottom of the battery case. Thus, the cross-sectional shape of each bulging partition wall 3a is formed to have a vertical wall surface 3a1 and an inclined wall surface 3a2.
The recesses 4, 4,... That open to the five bottom surfaces corresponding to the five partition walls 3, 3,... May be formed in one longitudinal recess over substantially the entire length in the width direction of the bottom surface. In order to reinforce the battery case 1, as shown in FIG. 3, the battery case 1 was divided into two parts by a dividing wall 1c at the center in the width direction of the bottom surface.
On the other hand, on both side surfaces of the upper part of each partition wall 3, a plurality of vertical ribs 5, 5,... Vertical grooves 6, 6,... Are formed between 5 and 5.
Thus, when the protruding degree of each vertical rib 5 is the same as the vertical wall surface 3a1 of the bulging partition wall 3a, a thin positive electrode plate and negative electrode plate are stacked in each cell chamber 2 via a separator. When the electrode plate group 7 is inserted, the lower part of both end faces of the positive electrode plate 7 is sandwiched by the opposed bulging partition walls 3a, 3a, and the upper part is sandwiched by the opposing vertical ribs 5, 5, The entire electrode plate group can be obtained a storage battery stably and securely housed in each cell chamber 2.

Further, the projecting degree of each vertical rib 5 may be made to project from the projecting degree of the vertical wall surface 3a1 of the bulging partition wall 3a and be dropped, and the hanging part may be combined with the bulging partition wall 3a. .
More specifically, in the example shown in the figure, the bulging partition wall 3a is slightly protruded by about 0.1 mm from the vertical wall surface 3a1 to substantially the same icicle position as the vertical wall surface 3a1 and is suspended, and the hanging part is the bulging partition wall. 3a is a vertical rib 5 that is integrated with the vertical wall surface 3a1 of the cell 3a and that reaches the bottom surface of the cell chamber 2. Thus, the insertion resistance when the electrode plate group 7 formed by laminating the thin positive electrode plate and the negative electrode plate through the separator in each cell chamber 2 is reduced, and the both end surfaces of the electrode plate group 7 are reduced. The lower part is sandwiched between the bulging partitions 3a1 and 3a1 via the opposing vertical ribs 5, and the upper part is sandwiched between the opposing vertical ribs 5 and 5, so that the electrode plate group 7 is stably and robustly placed in each cell chamber 2. A housed storage battery is obtained.

  In the illustrated example, the total height of the height of the bulging partition wall 3a and the height of the vertical rib 5 is slightly higher than the height of the electrode plate group accommodated in the cell chamber 2 in advance. Set to. In the present invention, “the lower part of the partition wall 3” means a height portion from the bottom surface of the cell chamber 2 that is lower than the height of the electrode plate group accommodated in the cell chamber. This means that the upper end of the bulging partition wall 3a provided at the lower part of the partition wall 3 is at a position lower than the height of the electrode plate group, and thus the vertical rib 5 provided on the upper side surface of the bulging partition wall 3a is This means that the upper end of the electrode plate group is provided so as to be at least approximately the same height as the upper end of the electrode plate group, that is, at least approximately the same height as the upper ends of the electrode plates on both end faces of the electrode plate group.

  Further, the both end walls 1a, 1a of the battery case 1 correspond to a height substantially equal to the height of the electrode plate group accommodated in the cell chambers 2, 2 at both ends, and press contact the end surfaces thereof. It was formed on a bulging end wall that was bent and bulged inward so that a suitable vertical wall surface was formed. In the illustrated example, each of the bulging end walls 1a, 1a is provided with a vertical groove 9 that extends from the upper end to the bottom surface of the cell chamber 2 with a certain interval in the width direction on the inner surface thereof. A rib 10 that press-contacts the end face of the electrode plate group 7 was formed between adjacent vertical concave grooves 9 and 9. Thus, when the electrode plate group is inserted into each cell chamber 2 at both ends thereof, both end surfaces of the electrode plate group are vertically arranged on the bulging partition wall 3a at the lower side of the inner partition wall 3 and the side surface at the upper side thereof. Are sandwiched between the ribs 5, 5,... And the ribs 10, 10,... Of the bulging end wall 1a, and the vertical grooves 9, 9,.

  Thus, when the electrode plate group 7 is accommodated in each cell chamber 2 of the monoblock battery case A configured as described above as indicated by phantom lines, it is held and fixed in the cell chamber 2 as described above. In each partition wall 3 partitioning the cell chambers 2, 2,..., Vertical ribs 5 and 5 are arranged in the width direction on both side surfaces of the upper portion 3b. Between the both end faces of the inserted electrode plate group 7 and the vertical ribs 5, 5,... Pressed against this, an electrolyte inflow passage is formed by the vertical grooves 6, 6,. Become. In addition, one end face of both end faces of the electrode plate group 7 accommodated in each cell chamber 2 at both ends of the battery case 1 is between the vertical ribs 5, 5,. An electrolyte inflow passage is formed by 6,.

  As described above, after the electrode plate group 7 is incorporated in the monoblock battery case A of the present invention, the intermediate electrode column rising from the positive and negative straps of the electrode plate groups 7 and 7 adjacent to each other is celled by a conventional method. Welding each other through through-holes for inter-connection 8, 8, ..., connecting them in series, and applying a lid (not shown) to the monoblock battery case A in a gas-liquid tight manner, and at the same time, providing it to the electrode plates at both ends The positive and negative poles are inserted and protruded outside through the lid insertion holes, and a predetermined amount of electrolyte is injected from the injection port provided in the lid corresponding to each cell chamber 2, and then a liquid stopper is applied. And a storage battery.

  In the monoblock battery case A of the present invention, when a predetermined amount of electrolyte is injected into each cell chamber 2, the electrolyte injected into the intermediate cell chambers 2, 2,. It flows down the electrolyte inflow passages on both sides of the group 7 and penetrates into the electrode plate group 7 from both sides, so that a predetermined amount of electrolyte solution stays in the upper space of the electrode plate group 7 and does not overflow to the outside. Can be smoothly and quickly performed, and the problem of leakage of the electrolyte in the conventional monoblock battery can be solved. In this case, as described above, when the vertical ribs 5, 5,... Are joined down to the vertical wall surface 3a1 of the bulging partition wall 3a, an electrolyte injection passage is provided between the vertical ribs 5, 5,. Since it is formed, the effect of preventing liquid leakage is further improved. Further, the electrolyte injected into each cell chamber 2 at both ends is an electrolyte formed between the vertical ribs 5, 5,... Disposed on the respective partition walls 3 in pressure contact with the inner end face of the electrode plate group 7. It flows down the inflow passage, penetrates into the electrode plate group 7 from one side, and can smoothly and quickly inject a predetermined amount of electrolyte without staying above the electrode plate group 7. Liquid leakage can be prevented. In addition, there is no leakage of electrolyte even if the battery is charged immediately after the completion of injection into the manufactured storage battery. Furthermore, even when the storage battery is mounted on an automobile or motorcycle and running, no leakage of the electrolyte is observed. There wasn't.

  In the above-described monoblock battery case of the present invention, each of the bulging partitions 3a is formed on the inclined surface 3a2 that faces downward as it reaches the inside of the cell chamber 2, as described above. In addition, the upper end surface of each vertical rib 5 is similarly formed in a downward inclined surface 5a as it goes inward of the cell chamber 2, thereby promoting the permeation action to the electrode plate group 7 due to the flow of the electrolyte. can do.

  In addition, on the vertical wall surfaces of the respective bulging end walls 1a, 1a of the battery case 1 of the monoblock battery case A, there are a plurality of strips that are spaced in the width direction and open from the upper end to the lower end, In the embodiment, five vertical concave grooves 9, 9,... Are formed, and when the above-mentioned electrode plate group is inserted into each cell chamber 2 at both ends thereof, the electrode plate group 7 in pressure contact with the bulging end wall 1a. It is preferable to form an electrolyte inflow passage by these vertical concave grooves 9, 9,. As a result, the electrolyte injected into the cell chambers 2 and 2 at both ends can be deeply flown into the electrolyte inflow passage, and thus penetrates the entire length of the electrode plate to one end face of the electrode plate group facing it. Thus, the electrolyte solution injection operation can be performed more quickly, and the electrolyte solution leakage preventing effect can be improved.

Next, more specific examples of the monoblock battery case of the present invention will be described.
Examples Specific examples of dimensions of the monoblock battery case A of the present invention will be described in detail below.
The height of the four peripheral walls of the battery case 1 is about 70 mm, the height of each partition wall 3 partitioning the battery case 1 into cell chambers 2, 2,... Is about 70 mm, and the five partition walls 3, 3,. In addition, a trapezoidal protruding wall that protrudes about 5 mm above the battery case 1 is provided above the side having the through holes 8 for connecting the intermediate poles alternately disposed on the left and right sides. The height of each bifurcated partition wall 3a formed at the bottom of each partition wall 3 is about 25 mm from the bottom surface of the cell chamber 2, the height of the vertical wall surface 3a1 is about 20 mm, and the height of the inclined wall surface 3a2 is The depth of the recess 4 opened at the bottom of the battery case was about 20 mm, and the opening width was about 5 mm. The height of each vertical rib 5 protruding on both sides of the upper part 3b of the partition wall 3 is about 30 mm, of which the height of the vertical surface is about 25 mm, the height of the inclined surface 5a at the upper end is about 5 mm, and the partition wall 3 In the example shown in the figure, the degree of protrusion from the side surface of the bulging partition wall 3a is about 3 mm protruding about 0.1 mm from the vertical wall surface 3a1, its width is about 5 mm, and the width between the above vertical ribs 5 and 5 is 5 mm. A vertical groove 6 was formed. The height from the bottom surface of the cell chamber 2 of the vertical rib 5 to the vertical surface of the vertical vertical rib 5 in the illustrated embodiment is about 30 mm, and thus the height to be accommodated in each cell chamber 2. When the electrode plate group 7 having a thickness of about 52 mm and a thickness of about 10 mm in the stacking direction was accommodated, the electrode plate group 7 protruded about 2 mm above the upper end of the vertical surface of the vertical rib 5. Further, the width between the opposing vertical ribs 5 and 5 in each cell chamber 2 in the middle of the battery case 1 is pressed against the electrode plates on both end faces of the electrode plate group 7 to be held and fixed. About 5mm, which is suitable for Further, the end walls 1a and 1a at both ends of the battery case 1 are bulged inward at positions corresponding to the upper ends of the vertical ribs 5 of the partition wall 3 and have a vertical inner wall height of about 55 mm. 1a, and sandwiching the electrode plate group 7 between the vertical inner surface of each bulging end wall 1a having a height of about 50 mm and the respective vertical ribs 5 disposed on the inner partition wall 3 opposed thereto. The cell chambers 2 and 2 at both ends were configured to have a suitable width of about 10 mm. Also, each vertical groove 9 recessed in the vertical inner surface of the bulging end wall 1a is about 5 mm wide and about 0.5 mm deep, and the interval between the adjacent vertical groove 9 and 9 is about 3 mm, The width of the rib 10 that presses the end face of the electrode plate group 7 formed between the vertical grooves 9 and 9 is about 3 mm.

  In forming the partition wall that swells into the fork of the monoblock battery case A, the depth of the concave portion 4 opened in the bottom surface is relatively shallow, such as about 20 mm, so that there is no deformation of the core portion of the forming mold, It can be molded with good yield, and if the depth is about 30 mm, for example, the length of the core will also become longer, deformation will occur, and yield will tend to deteriorate, so the depth should be limited to about 25 mm Was found to be preferable.

  In the monoblock battery case A configured in this manner, a large number of electrode plate groups 7 are prepared by alternately laminating one thin positive electrode plate and two thin negative electrode plates with a separator interposed therebetween. The electrode plate group 7 includes a strap at the ear of the electrode plate, an intermediate cell chamber having an intermediate electrode column for inter-cell connection, and a cell chamber at both ends having a positive electrode column and a negative electrode column at the strap. And the adjacent intermediate pole columns are welded via the intermediate pole column connecting through holes 8 of the partition walls and connected in series, and then connected to the monoblock battery case A. A lid provided with positive and negative electrode column insertion holes was applied in a gas-liquid tight manner through the positive and negative electrode columns, and then a certain amount of electrolyte was rapidly injected into each cell chamber through the liquid injection port. In this injection work, the injection work could be completed without any overflow of the electrolyte. Next, each liquid inlet of the lid was closed with a liquid stopper having an exhaust hole to produce a lead-acid battery for a motorcycle.

Conventional Example According to the conventional Patent Document 1, the height of the recess, that is, the height of the bulging partition that branches into two branches, is approximately 54 mm in height that is approximately equal to the height of the electrode plate group accommodated in the cell chamber. (Corresponding to the height of the upper end of the rib in the above embodiment), and on the inner surfaces of the bulging end walls at both ends of the battery case, except that the concave grooves of the present invention are formed on the entire flat vertical surface. A monoblock battery case having the same configuration as that of the example was formed, and the same constant amount of electrolytic solution was gradually poured into each cell chamber over time using the same as in the above example. (Injecting at the same rate as the example often overflowed from the spout). Thus, a lead-acid battery for a motorcycle was manufactured in the same manner as in the example.

Comparative test Furthermore, for the storage battery of the above example and the conventional storage battery, after injecting the electrolyte solution, let the following 1CA charging current flow after standing for 5 minutes, and whether there is liquid leakage from the exhaust hole of the liquid plug I investigated.
As a result, liquid leakage was confirmed in the conventional storage battery immediately after the start of charging. On the other hand, the storage battery of the present invention showed no liquid leakage even after 1 hour from the start of charging.
Furthermore, using the conventional monoblock battery case and the monoblock battery case of the example, each of the instant storage batteries was manufactured, the electrolyte was injected, and the battery was mounted on a motorcycle and ran for 15 minutes. As a result, leakage of the electrolyte from the conventional storage battery was observed. On the other hand, no liquid leakage was observed from the storage battery of the present invention.
As is clear from the above, the storage battery using the monoblock battery case of the present invention can rapidly inject the electrolyte solution, and the liquid can be charged even if the next charging operation is performed immediately after the injection. Is not leaking, and it is of great industrial utility as a vehicular storage battery.

The top view of the monoblock battery case for storage batteries of an example of implementation of this invention. FIG. 2 is a cross-sectional view taken along the line II in FIG. The bottom view of the battery case. FIG. 2 is a sectional view taken along line II-II in FIG.

Explanation of symbols

1 battery case
1a The bulging end wall of the battery case
2 cell room
3 Bulkhead
3a Swelling bulkhead
5 Vertical rib
6 Vertical groove
7 plate group
9 Vertical groove on the inner surface of the bulging end wall
10 ridges
A Monoblock battery case of the present invention

Claims (2)

  The lower part of each partition wall in the battery case is formed into a double bulging partition wall that branches and hangs down into two branches and is connected to the bottom wall of the battery case. A plurality of vertical ribs protruding to the same surface position as the surface of the bulging partition wall or a plurality of vertical ribs protruding from the surface of the bulging partition wall and suspended, and the hanging portion united with the bulging partition wall. And a vertical concave groove is formed between the vertical ribs, and the lower portions of both end faces of the electrode plate group accommodated in each cell chamber are sandwiched by the opposed bulging partition walls or the bulging partition walls via the vertical ribs. And a storage battery having a monoblock battery case characterized in that the upper part is sandwiched between the opposing vertical ribs.   End walls that are bent and bulged inward at both end walls in the stacking direction of the electrode plate group of the battery case at a wall portion corresponding to a height substantially equal to the height of the electrode plate group accommodated in the cell chambers at both ends The monoblock battery case according to claim 1, wherein a plurality of vertical grooves are formed on the inner surface of the bulging end wall at a predetermined interval in the width direction. Storage battery.

Images