Cell module for a battery of a motor vehicle and method for producing such a cell module
A cell module for a battery of a motor vehicle has a plurality of battery cells for storing electrical energy and a module frame which includes at least two pressure elements, between which the battery cells are arranged, and at least one tension rod which is loaded in tension. The tension rod is formed from a material and by which the pressure elements are clamped against each other via the battery cells. As a result, the battery cells are compressed, wherein the pressure plates are clamped against each other by the tension rod in such a manner that a yield strength or the 0.2% yield limit of the material of the tension rod is reached.
1. A cell module for a battery of a motor vehicle, comprising:
a plurality of battery cells that store electrical energy;
a module frame comprising at least two pressure elements and at least one tension rod, wherein
the plurality of battery cells are arranged between said two pressure elements,
the tension rod is loaded in tension and by which the two pressure elements are stressed against one another via the plurality of battery cells whereby the battery cells are clamped together, and
the two pressure elements are stressed against one another via the at least one tension rod such that a yield strength or 0.2% yield limit of a material of the tension rod is reached in a fully charged state of the plurality of battery cells.
2. The cell module as claimed in claim 1 , wherein the yield strength is an upper yield strength of the material.
3. The cell module as claimed in claim 1 , wherein one of the pressure elements is provided as a fixed bearing, the fixed bearing being fixable to a component of the battery.
4. The cell module as claimed in claim 3 , wherein the component is a housing of the battery.
5. The cell module as claimed in claim 3 , wherein the other pressure element is configured as a floating bearing displaceable relative to the component.
6. The cell module as claimed in claim 1 , wherein the tension rod is connected to the pressure elements in a materially-bonded manner.
7. The cell module as claimed in claim 1 , wherein the pressure elements are pressure plates.
8. A battery for a motor vehicle, said battery comprising at least one cell module as claimed in claim 1 .
9. A method for producing a cell module for a battery of a motor vehicle, the method comprising the steps of:
providing a plurality of battery cells for storing electrical energy;
providing a module frame that comprises at least two pressure elements and at least one tension rod that is formed from a material;
arranging the battery cells between the pressure elements;
stressing the pressure elements against one another via the plurality of battery cells by way of the tension rod, whereby the tension rod is placed under tension, wherein
the pressure elements are stressed against one another by the tension rod such that the material of the tension rod reaches a yield strength or a 0.2% yield limit in a fully charged state of the plurality of battery cells.
10. The method as claimed in claim 9 , wherein
the plurality of battery are pressed against one another by a compression device that differs from the module frame, and
in the state in which said plurality of battery cells are clamped together by the compression device, said plurality of battery cells are provided with the module frame, wherein the material of the tension rod reaches the yield strength or the 0.2% yield limit after the compression that is effected by the compression device is terminated.
11. The method as claimed in claim 10 , wherein
the tension rod is connected to the pressure elements in the state in which the plurality of battery cells are pressed together via the compression device.