CROSS-REFERENCE TO RELATED PATENT APPLICATIONS
The present application is a Continuation of International Application PCT/EP2008/008712, filed Oct. 15, 2008, which claims priority to German Application DE 10 2007 052 330.2, filed Oct. 31, 2007. The entire disclosures of International Application PCT/EP2008/008712 and German Application DE 10 2007 052 330.2 are incorporated herein by reference.
BACKGROUND
The invention relates to a round cell rechargeable battery.
EP 0 917 230 B1 discloses a rechargeable battery having a temperature-regulating apparatus.
DE 10 2004 005 364 A1 describes an electrochemical energy store.
DE 102 23 782 B4 discloses a battery having at least one electrochemical storage cell and a cooling device, through which a liquid cooling medium flows. The storage cells are held in openings in the cooling devices and make a force-fitting contact in places with in each case one outer surface, which is curved in a direction at right angles to the longitudinal axis of the storage cell. An expansion joint is provided in the areas of the force-fitting contact.
DE 10 2007 009 315 A1 discloses an apparatus for cooling electrical elements with conductor bodies which are in thermal contact with side surfaces of the electrical elements, in order to dissipate heat.
Heat dissipation is a problem in an electrical rechargeable battery with round cells. This problem is made worse because the cell cup is at an electrical potential.
The object of the present invention is therefore to provide an improved round cell rechargeable battery.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a perspective view of a round cell which is installed in a hexagonal housing.
FIG. 2 shows a perspective view with a number of round cells which are arranged adjacent to one another and are held in a respective housing.
FIG. 3 shows a plan view of the round cell arrangement from FIG. 2.
FIG. 4 shows an exploded view, in which the round cells which are arranged alongside one another are introduced from underneath into the cage formed by the zigzag-shaped output elements.
FIG. 5 shows a corresponding view, in which the round cells fitted to the respective housing are introduced from above into the cage formed by the zigzag-shaped output elements.
FIG. 6 shows a similar exploded view.
FIG. 7 shows a plan view of a housing with a round cell that has been introduced into it.
FIG. 8 shows a metallic output element which is produced from an extruded part and has curved outer walls to which the outer walls of the round cells are connected.
FIG. 9 shows an embodiment of a rechargeable battery in which the round cells are not inserted into a respective housing but into a holder which is formed by the output elements in conjunction with the round rods.
FIG. 10 shows a plan view of the rechargeable battery arrangement shown in FIG. 9.
FIG. 11 shows an exploded view of the rechargeable battery.
FIG. 12 shows an exploded view of the rechargeable battery.
FIG. 13 shows a plan view of the output element from FIG. 8.
FIG. 14 shows a different embodiment of a rechargeable battery, in which an output element extends integrally over preferably the entire length of the rechargeable battery.
FIG. 15 shows the output element of FIG. 14 in more detail.
FIG. 16 shows a plan view of the output element from FIG. 15.
FIG. 17 shows a plan view of the rechargeable battery in the assembled state.
FIG. 18 shows an exploded view.
DETAILED DESCRIPTION
The object is achieved by specifically shaped metallic output plates. The outer contact surface of the cups of the round cells or the contact surface of the output elements is or are also provided with an electrically insulating coating, for example with thermally conductive lacquer of specific plastic film. The insulating output elements can also be produced from a thermally conductive electrically insulating plastic. The thermally conductive plastic may, for example, be filled with ceramic. By way of example, boron nitride is suitable for use as a ceramic filling.
Tubes for the coolant are mounted in the output elements and may be formed, for example, from aluminum or steel.
The metallic output elements themselves may, for example, be formed from copper or aluminum heat sinks The use of extruded parts is particularly suitable.
All contact surfaces can be provided with a thermally conductive paste, a thermally conductive gel or a thermally conductive adhesive in order to improve the heat transfer. By way of example, the product Alphagel from the Geltec company (http://www.geltecco.jp/english/gel/app—03htm) or the product Keratherm® from the Kerafol company (http://kerafol.de) are suitable for this purpose.
The invention will be described in more detail in the following text with reference to the attached drawings.
FIG. 1 shows a perspective view of a round cell which is installed in a hexagonal housing 2 which has a cylindrical area for holding the round cell 1. The edges of the housing 2 are provided with grooves for holding output elements.
FIG. 2 shows a perspective view with a number of round cells 1 which are arranged adjacent to one another and are held in a respective housing 2. The output elements 3 which are in the form of a curved round rod can be seen. The round rod is curved such that it runs along a lower edge or upper edge to form a side edge, in order to merge at an upper edge or lower edge. The output elements 3 have a zigzag-shaped profile and are introduced into the grooves on the side edges of the housing 2.
FIG. 3 shows a plan view of the round cell arrangement from FIG. 2.
FIG. 4 shows an exploded view, in which the round cells 1 which are arranged alongside one another are introduced from underneath into the cage formed by the zigzag-shaped output elements 3.
FIG. 5 shows a corresponding view, in which the round cells 1 fitted to the respective housing 2 are introduced from above into the cage formed by the zigzag-shaped output elements.
FIG. 6 shows a similar exploded view.
FIG. 7 shows a plan view of a housing 2 with a round cell 1 that has been introduced into it. In addition to the pole connections 4a, 4b for the positive and negative poles, a degassing valve 5 is also provided, in a manner known per se.
FIG. 8 shows a metallic output element 6 which is produced from an extruded part and has curved outer walls to which the outer walls of the round cells 1 are connected. A hole for holding the output element 3, which is in the form of a rod, is located in the center of the output elements 6. Incisions 8 project radially from the holes into the output element 6, in order to achieve better cooling and flexibility.
FIG. 9 shows an embodiment of a rechargeable battery in which the round cells 1 are not inserted into a respective housing 2 but into a holder which is formed by the output elements 6 in conjunction with the round rods 3.
FIG. 10 shows a plan view of the rechargeable battery arrangement shown in FIG. 9.
FIG. 11 shows an exploded view of the rechargeable battery. This clearly shows how the round cells 1 are plugged into the round cell holders which are formed by the extruded output elements 6, which form a heat sink, and the round rod output elements 3 which pass through the output elements 6.
This can be seen even more clearly in the exploded view in FIG. 12.
FIG. 13 shows a plan view of the output element 6 from FIG. 8.
FIG. 14 shows a different embodiment of a rechargeable battery, in which an output element 9 extends integrally over preferably the entire length of the rechargeable battery and, for example as illustrated, holds 7 rechargeable batteries and corresponding partially circular walls for this purpose.
The embodiment of the output element 9 is shown in more detail in FIG. 15. The hole for holding the round rod output elements 3 and the incisions are comparable to the output elements 8 in the second embodiment.
FIG. 16 shows a plan view of the output element from FIG. 15.
FIG. 17 shows a plan view of the rechargeable battery in the assembled state.
FIG. 18 shows an exploded view.
Patent Application
20100266886
