SI8212842A8 - Casing for accumulator batteries for industry use - Google Patents

Description

KDCHI FOR INDUSTRIAL ACCUMULATOR BATTERIES

CBIAST TECHNIQUES

The invention 'broadly' falls within the scope of means for the direct conversion of chemical energy into electrical energy - the battery and its structural parts. The invention particularly relates to the construction of a battery housing made of thermoplastic material, applicable to industrial rechargeable batteries, which are specifically used for electric traction. According to the International Patent Classification, the invention belongs to code H 01M 2/02.

TECHNICAL PROBLEM

The technical problem to be solved is to increase the energy potential of the battery by increasing the volume of the electrolyte without altering the outer dimensions of the housing, while avoiding the defocusing of the walls of the housing under the influence of the hydrostatic pressure of the electrolyte.

BACKGROUND OF THE INVENTION

Rechargeable batteries for industrial use (electric traction, etc.) are manufactured with prescribed external ones. dimensions according to international standards. If an increase in the electric capacity of a rechargeable battery is to be increased by increasing the usable volume occupied by the electrolyte, this must be achieved by maintaining the gender dimension determined by international regulations.

One of the ways they can achieve an increase in the volume of electrolytes within the established dimensions is to reduce the thickness of the walls of the casing of the rechargeable batteries.

However, this thickness can only be reduced to a certain extent dictated by the resistance of the applied material, below which the hydrolytic pressure of the electrolyte causes deformation of the casing walls.

In addition, it must be avoided that the connection between the side walls of the housing and the battery cover leads to protruding profiles, since in any case, any reduction in wall thickness would be useless.

According to U.S. Pat. No. 3,993,507 of November 23, 1976, which relates to long battery housing enclosures, in order to avoid deformation of the enclosure walls, a plurality of external transverse rib discharges are provided for each enclosure. These ribs receive a load due to the hydrostatic pressure of the electrolyte. In this case, since the ribs extend along the outer side of the housing, it is necessary to stay within the limits of certain international standards, which inevitably leads to a reduction of the useful volume of electrolytes in the battery.

With regard to the connection between the lid-1 housing and the housing. ^ To avoid increasing the overall dimensions of the housing, the known technique provides for welding from the upper side of the angular joint between the cover made with straight edges, and the corresponding edges of the sides of the housing.

This method of welding leads to the formation of an outer seam, which must be machined by partial removal of the material / hako himse-other -ntar of the standard overall dimensions.

However, this procedure has two disadvantages. The first disadvantage is that the subsequent stitching operation is an additional cost in production. Another disadvantage is that with this treatment of the seam of the stripped material, the air bubbles remaining in the material itself can open, which can compromise the tightness of the joint of the lid and the housing. Also, the leakage of -leakage -electrolyte is due to the porosity of the seam. This makes it difficult to automatically recharge the electrolyte, ie. automatic control of the electrolyte level based on the drop or increase in the battery pressure during the operation itself.

GPIS TECHNICAL PROBLEM SOLUTIONS

The object of the present invention is the housing of an industrial rechargeable battery, made of thermoplastic mass, which with unchanged overall dimensions has an increased electrolyte barrier.

An important feature of the invention is that it is impossible to deform the thin walls of the casing, which is even more severe due to the increased hydrostatic pressure of the electrolyte, especially for large-size batteries.

Another objective has been achieved, namely that the casting of the housing, thanks to each special shape, can be cut to different standard dimensions after the casting, so that batteries of different capacities can be produced from one casted semi-finished product.

A particular object of the invention is to subsequently weld welds

3.

the connection between the lid and the body of the housing is guaranteed to the guarantor, and is made within the permissible overall outer dimensions of the housing.

In the description that follows, the invention is de tally described in one embodiment and with reference to the attached plan, to the following:

- Figure 1 shows the gender and appearance of the battery housing according to the invention, given in axonanetry;

- Figure 2 shows an enlarged detail of the joint of the cover and the body of the housing, given in cross-section;

- Figure 3 shows in cross-section an enlarged detail of the casing portion of the casting of the housing after casting, and before the final seating arrangement;

- Figure 4 shows the detail of the joint of the lid and the body of the case, in the case of a case of reduced height; .

- Figure 5 shows a detail of the housing of Figure 1 given in cross-sectional view;

- Figures 6 and 7 show the possible deformations of the cross-section of the housing.

Figure 1 shows the gender and appearance of a parallel-piped cast-iron battery case made of tenmoplastic material (usually of rropylene). a blow mold in the mold. The housing consists of a body 1 and a cover 11, which are welded together in a later manner. The vertical walls of the body of the 1 casing are made with horizontal ribs all over, so that in the cross section there is a so-called. an outlined profile, partly shown in Figure 5. The outer profile on the outer surface of the vertical walls of the housing is manifested in the form of strip recesses, denoted by 2,3,4,5,6,7 and 14. The thickness S of the walls is constant, ie. the vertical walls of the body 1 of the case have the same thickness S and at the points of the recesses, which are imprinted at a depth of 1-2 nm relative to the outer contour. Such profiling of the vertical walls achieves a rigidity which is sufficient to prevent the deformation of the housing due to the hydrostatic pressure of the electrolyte. Ϊ

The indicated recesses are furthermore arranged at different heights corresponding to the standard heights of the finished housings, so that, if _; this is necessary, possibly by crossing the body of the casting along the corresponding horizontal recess to obtain a housing of the desired height, which corresponds to the standard designed dimensions'. The recessed recesses also serve as a guide when installing and placing the accu- lator in the appropriate frames (frames) in which it has a fixed attachment.

As seen in Figures 2,3 and 5, the upper end of the housing of the housing is particularly stepped. In Fig. 3 two steps, marked by 8 and S) are noticeable. After casting, by cutting along plane A-A, step 8 is removed so that up to 4.

the upper edge of the vertical walls of the housing, which is enlarged surface, is at the front. The width of this edge is equal to the sum of the thickness S of the wall and the thickness of the step 8. Thus, the upper edge of the housing wall thus obtained represents the surface marked with 10, which is inserted by the cover 11 (Figure 2). Surface 10 is at the same time the surface on which the cover 11 is welded. It is noticeable that this design of the bulky part of the housing has created a larger welding surface, which provides a connection of a higher degree of safety between the body 1 of the housing and the cover 11. This is especially necessary for larger acculators. of a dimension exceeding 500 nrn in height.

It is also apparent from Figure 2 that the seam of the welding of the lid 11 and the body 1 of the housing will form in zones 12 and 13, along the entire surface 10. The zones 12 and 13 are located within the outer dimensions of the housing which remain intact, and therefore subsequent seam reversal required.

The depth of the step 9 is selected over the thickness of the wall of the lid 11, so that the folded ends of the lid 11 do not retract the standard dimensions of the housing, but can be housed in a space limited by the outer knnfnrm of the housing 1 of the depth of the steps 9.

In Fig. 5, which is a partial cross-section of the bulky part of the body 1 of the housing, a recess 14 is shown to provide reinforcement at the end of the housing. This reinforcement avoids the deformation of the housing which may occur in the upper part of the housing due to the efforts of the molding process, which preserves release after cutting along the & -A plane. This deformation of the housing is shown schematically in Figure 6, while Figure 7 shows the deformation of the housing which places us under the printed electrolyte. It is a characteristic of enclosures without shallow recesses horizontally arranged in circumference, shown in Figure 1.

Figure 4 shows the junction of the body 1 of the housing and the holder 11, which provides a sufficient degree of security when applied to shorter battery packs. The battery casing is formed by cutting the casing outlet along, for example, recesses 2, at a suitable height, giving the same casing the required lower standard height. In the σναη case, since there is no double step, it is possible to use only that surface for welding «that is given by the thickness of the casing wall, but which 'is sufficient to Provide sin ur nasal adhesion. As in the case of σναη, the weld seam formed by the r is bent, however, the contact surface between the cover 11 and the body of the hub is somewhat increased.

Battery housings profiled according to the invention ϊη £: the indicated method, * obtained by casting a method of storing thermoplastic mass, Chase - in the characteristic case, a thickness S of vertical walls of about 2.0 mm. At the same

5.

in the typical case, an unprofiled housing made by injection molding would have a wall thickness of about 3.5 mn, and at the same external dimensions. As the recess depth-2-7,1-4 is 1.5-2 mn, the total thickness-SE profile of the wall (minimum thickness required for casings of different sizes) is 3.5-4 mn. This means that, according to the invention, at the same outer dimensions of the housing, the same is achieved in the recess zones. or just a little less and electrolyte constipation compared to the classic non-Jewish Jews solution. At the same time, in the zones of the ribs (eg ribs 15.16 in Fig. 5), which are distributed between the recesses along the entire height of the housing, - a noticeable increase in the closed np elpktml -ita is achieved, thus reducing the total wall thickness in these zones, by about 1.5 mn. By comparing two enclosures of the same standard external dimensions (196 x 63 x 400), one of which is made of the breast; 295 ml, which increases the electrolyte constipation by about 8% —This electrolyte constipation increases the battery capacity by about 4-6%. An increased volume was achieved with a constant wall thickness of about 2 mn, with 6 recesses on the vertical walls, with a recess width of about 10 mn and a depth of 1.5 mn.

SIOCCHIEPO OLIMPIO

Montoroso Vicentino, Vicenza, Italy

Representative, st ·. λ

Vlajkf - »! <*. Evi λ ^; '· «-Λ,«''ir,<·.'·''

P - 2842/82

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NAVCD ON THE BEST WAY TO PREVIOUS UPCESS OUTPUT

The case for industrial rechargeable batteries according to the invention is made. se. liven j en, the process of blowing a thermoplastic race n mold. Tons do not require special guidance or knowledge, except those of the average expert in the field.

Suitable material but copolymers of propylene-or-polyethylene- It is desirable to use semi-automatic devices with 3-6 rotary molds. The thickness of the vertical walls of the casing should not be more than 2.0 m, the number of horizontal recesses depends on the height of the casing., - and -crossing to. The recess width is usually about 10 nm and the depth is about 1.5 nm.

iQ ΩΤ.ΤΜΡΤΩ, Mnntornso Vicentii

Claims (3)

PATENT REQUIREMENTS 1. Housing for industrial rechargeable batteries, with thin Jews, cast by a process of storing a polyethylene or polypropylenephase n mold, namely, which is a folded vertical wall of the lid (11) housed in a space limited by the width of the steps (9) of the body (1) without extending beyond the outer contour of the body (1) of the housing, the zones (12,13) of the collateral seams being within the outer dimensions of the housing, wherein the width of the surface (10) of the cover (11) to the body (1) of the housing because of the thickness (S) of the vertical walls of the body (1) for the height of the steps (8), and that shallow recesses (2,3,4,5,6,7) for stiffening are arranged according to the circumference of the body at standard heights. Casing according to claim 1, characterized in that a recess (14) for stiffening is provided on the upper part of the casing body (1), below the bulging portion (15). 3. The housing according to claim 1 and a variant embodiment, characterized in that the cover (11) is welded to the upper edge of the vertical body walls (1) of the housing in the recess zone (2,3,4,5,6,7).