JP3948932B2 - Collective battery end plate - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an end plate of an assembled battery.
[0002]
[Prior art]
Conventionally, as this type of assembled battery, a battery using a metal end plate has been proposed (for example, JP-A-11-120969). In this collective battery, a metal end plate is disposed at both stacked ends where a plurality of unit cells are stacked, and is restrained using a restraining band to constitute a battery pack.
[0003]
[Problems to be solved by the invention]
However, in such an assembled battery, the unit cell disposed near the end plate is easily affected by the outside air due to the high thermal conductivity of the metal, and the temperature of the unit cell is made uniform with other unit cells. It was difficult. Moreover, since it is difficult to form a flow path for the cooling medium between the end plate and the single cell, the single cell that contacts the end plate may be likely to be hotter than other single cells during charging and discharging. Furthermore, since the end plate is made of metal, the weight is increased.
[0004]
One object of the end plate of the assembled battery of the present invention is to reduce the influence of the outside air of the unit cells arranged in the vicinity of the end plate. Another object of the end plate of the assembled battery according to the present invention is to improve the cooling performance of the abutting unit cell. Furthermore, the end plate of the battery assembly of the present invention is one of the purposes for reducing the weight.
[0005]
[Means for solving the problems and their functions and effects]
The end plate of the assembled battery of the present invention has taken the following means in order to achieve at least a part of the above-described object.
[0006]
Collecting case battery end plate of the present invention is a end plate disposed in the stacking end of the set battery unit cells formed by laminating a plurality of heat insulating effect of the air on the back of the surface abutting the unit cells are stacked The gist of the present invention is that a rib for generating the above is formed.
[0007]
According to the end plate of the collector case battery of the present invention, the heat insulating effect of the air by the ribs, it is possible to reduce the outside air impact of unit cells arranged in the end plate near.
[0008]
In the end plate of the collector case battery according to the aspect of the invention, the rib may also be composed are formed in a cross shape. If it carries out like this, a rib can be formed easily.
[0012]
In the end plate of the collector case battery of the present invention including each of these embodiments may be composed are made of resin. If it carries out like this, the influence of the external air of the single cell arrange | positioned in the end plate vicinity by the heat insulation of resin can be reduced, and weight reduction can be achieved compared with what was formed with the metal.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described using examples. 1 is a perspective view of an end plate 20 of an assembled battery according to an embodiment of the present invention as viewed from the contact surface 22 side, and FIG. 2 is a non-contact view of the end plate 20 of the embodiment of FIG. 3 is a perspective view seen from the side of the surface 32, and FIG. 3 is a cross-sectional view showing an AA cross section of the end plate 20 of the embodiment of FIG.
[0017]
As shown in FIG. 3, the end plate 20 of the embodiment is disposed at both stacked ends of the assembled battery 5 formed by stacking a plurality of single cells 10 and is injection-molded with a resin mixed with glass fibers or the like. It is molded by. As shown in FIGS. 1 and 3, the surface of the contact surface 22 of the unit cell 10 is cooled in the same manner as the cooling air flow path 12 formed between the unit cells 10 when the unit cell 10 is contacted. A plurality of ribs 24 arranged in parallel at substantially equal intervals to form the air flow path 26 are formed, and as shown in FIGS. Cross-shaped ribs 34 forming 36 are formed on the entire surface.
[0018]
Moreover, the bolt attachment part 40a-40f which has the restraint holes 42a-42f which let the restraint bolt for restraining the laminated body formed by the several cell 10 is formed in the outer peripheral part of the end plate 20 of an Example. ing. FIG. 4 shows an enlarged cross-sectional view of the bolt mounting portion 40b. As shown in the figure, a constraining bolt 42 inserted into a hollow portion of the collar 50 is fitted with a collar collar 50 with a hook formed of a material having high rigidity, for example, a metal such as steel. The laminated body can be restrained by 52 and the restraining tube 54.
[0019]
According to the end plate 20 of the embodiment described above, since the end plate 20 is formed of resin, the influence of the outside air of the unit cell 10 disposed in the vicinity of the end plate 20, particularly in contact with the end plate 20 is reduced due to the heat insulating action of the resin. can do. Further, since the resin is lighter than the metal, the end plate 20 and the assembled battery 5 can be reduced in weight.
[0020]
Further, according to the end plate 20 of the embodiment, since the plurality of ribs 24 that form the cooling air flow paths 26 are formed on the contact surface 22, the cooling performance of the unit cell 10 that contacts the end plate 20 is improved. be able to.
[0021]
Further, according to the end plate 20 of the embodiment, since the cross-shaped ribs 34 are formed on the non-contact surface 32, the end plate 20 is disposed in the vicinity of the end plate 20 by the heat insulating action of the heat insulating portion 36 by air. The influence of the outside air of the unit cell 10 can be reduced.
[0022]
Further, according to the end plate 20 of the embodiment, since the metal collar 50 is attached to the restraining holes 42a to 42f, restraint by caulking is not required, and maintenance such as replacement of the unit cell 10 can be facilitated. it can.
[0023]
In the end plate 20 of the embodiment, the cross-shaped rib 34 that forms the heat insulating portion 36 by air is formed on the non-contact surface 32, but the shape other than the cross shape, for example, the cross-sectional shape of the heat insulating portion 36 is other than the rectangular shape. The ribs 36 may be formed so as to have a polygonal shape, a circular shape, an elliptical shape, or the like. Further, in the end plate 20 of the embodiment, the collar 50 is formed of metal, but may be formed of any material as long as it has strength to withstand restraint.
[0024]
In the end plate 20 of the embodiment, a plurality of ribs 24 that form cooling air flow paths 26 are formed on the contact surface 22, and a cross-shaped rib 34 that forms a heat insulating portion 36 by air on the non-contact surface 32. Although formed, a plurality of ribs 24 may not be formed on the contact surface 22, or a cross-shaped rib 34 may not be formed on the non-contact surface 32.
[0025]
In the end plate 20 of the embodiment, the collar 50 is attached to the restraining holes 42a to 42f, but the collar 50 may not be attached to the restraining holes 42a to 42f.
[0026]
In the end plate 20 of the embodiment, the heat insulating portion 36 by air is formed by the ribs 34. However, as shown in the end plate 120 of the modified example of FIG. It is good also as what arrange | positions the plate 135 to perform. Since this closed space forms a heat insulating part 136 having a higher heat insulating effect by air, the influence of the outside air of the unit cell 110 arranged in the vicinity of the end plate 120 can be further reduced. Moreover, since the plate 135 is disposed in contact with the rib 134, the strength of the end plate 120 can be further improved. In addition, if the metal and resin which have especially electroconductivity are used as a material of the plate 135, the radiation noise from the cell 110 can be interrupted | blocked and the influence given to the exterior can be suppressed.
[0027]
In the end plate 20 of the embodiment and the end plate 120 of the modified example, the heat insulating portion 36 is formed by the ribs 34, or the heat insulating portion 136 is formed by the ribs 134 and the plate 135. 6, the temperature of the end plate 220 may be controlled by filling a space (groove) between adjacent ribs 234 with a heat insulating member 237 (gel-like heat insulating agent or the like). Good. In this way, by managing the temperature of the end plate 220 in an appropriate state by the heat retaining member 237, the influence of the unit cell 210 from the outside air can be further reduced. Note that a plate 235 is disposed at the tip of the rib 234 so as to contact the tip of the rib 234 in order to hold the heat retaining member 237 in the space between the ribs 234. Of course, the plate 235 can improve the strength of the end plate 220 and can block radiation noise from the unit cell when a conductive metal or resin is used as a material. It is also preferable to actively manage the temperature of the end plate 220 by using a heater or the like instead of the heat retaining member 237 or together with the heat retaining member 237.
[0028]
The embodiments of the present invention have been described using the embodiments. However, the present invention is not limited to these embodiments, and can be implemented in various forms without departing from the gist of the present invention. Of course you get.
[Brief description of the drawings]
FIG. 1 is a perspective view of an end plate 20 of an assembled battery according to an embodiment of the present invention when viewed from the contact surface 22 side.
FIG. 2 is a perspective view of the end plate 20 of the embodiment as viewed from the non-contact surface 32 side.
3 is a cross-sectional view showing an AA cross section of the end plate 20 of the embodiment of FIG. 1; FIG.
FIG. 4 is an enlarged cross-sectional view showing an enlarged cross section of a bolt mounting portion 40b.
FIG. 5 is a cross-sectional view showing a cross section of an end plate 120 of an assembled battery according to a modification.
FIG. 6 is a cross-sectional view showing a cross section of an end plate 220 of a modified battery pack.
[Explanation of symbols]
5 collective battery 10, 110, 210 single cell, 12 cooling air flow path, 20, 120, 220 end plate, 22 contact surface, 24 rib, 26 cooling air flow path, 32 non-contact surface, 34, 134, 234 Rib, 135, 235 Plate, 36, 136 Heat insulation part, 40a-40f Bolt attachment part, 42a-42f Restraint hole, 50 collar, 52 Restraint bolt, 54 Restraint pipe, 237 Thermal insulation member.

Claims (3)

An end plate disposed at a stacking end of an assembled battery formed by stacking a plurality of unit cells,
An end plate in which ribs for generating heat insulation by air are formed on the back surface of the surface in contact with the stacked unit cells.   The end plate according to claim 1, wherein the rib is formed in a cross shape. The end plate according to claim 1 or 2 formed of resin.

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