Arrangement for Measuring a Single Cell in a Rechargeable Battery Pack and Rechargeable Battery Pack Comprising such an Arrangement
Inactive Publication Date: 2013-08-15
METABOWERKE
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Benefits of technology
The present invention aims to prevent the debalancing of the charge state of rechargeable battery pack cells caused by measuring the electrical potential on the plus pole of each cell. This is achieved by integrating an arrangement with a control device that can activate and deactivate a load to prevent non-uniform discharge of cells. The control device can activate and deactivate the load by using a microcontroller and a digital output to control a series circuit of a semiconductor switch and a resistor. This results in a more efficient and durable rechargeable battery pack.
Problems solved by technology
Over the course of time, this causes the individual cells to become differently charged as a result of the measuring cycles, which can lead to a debalancing of the charge state of the individual cells.
Particularly, and in the case where the rechargeable battery pack is neither discharged by a working load, such as an electric motor of an electrical device for example, nor charged by means of a charging circuit, this results in the fact that, due to the debalancing of the charge state of the individual cell as a result of the monitoring, a separate charging process is required to match the charging states of the individual cells to one another once more.
This in turn leads to an increased number of charging cycles and therefore to increased wear of the individual cells of the rechargeable battery pack.
Method used
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[0020]The known electrical device 11 which is shown in FIG. 3 has a series circuit 13 composed of a plurality of cells 14 as an energy source. In the example as shown, ten cells 14 which are connected in series, are provided. The number of cells 14 can, however, be varied as required. The minus pole of a first outer cell 14a, which is shown at the bottom of FIG. 3, is connected to a ground conductor 17 of the electrical device 11. The plus pole of a second outer cell 14b, of the series circuit 13, is connected to a supply voltage conductor 18 of the electrical device 11. The individual cells 14, 14a, and 14b are connected to one another by means of connecting branches 20, and wherein in each case, a connecting branch 20 connects the plus pole of a cell 14, and 14a to the minus pole of the respectively adjacent cell 14, and 14b. In the example as shown, the cells 14 are lithium ion rechargeable battery cells which have a nominal voltage of 4.1 V, so that the overall series circuit 13...
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An arrangement for measuring a single cell in a rechargeable battery pack is described, and which includes a plurality of cells coupled in a series circuit, and wherein adjacent cells are electrically coupled to a connecting branch, and a measuring device comprising a switch is provided, and which selectively electrically connects one connecting branch to a measuring input of the measuring device.
Description
RELATED PATENT DATA[0001]The present application claims priority from German Application Serial No. 10 2010 021 176.1 and which was filed on May 21, 2010; and PCT Application Serial No. PCT / EP2011 / 058138 and which was filed on May 19, 2011.[0002]The invention relates to an arrangement for measuring a single cell in a rechargeable battery pack, and wherein the rechargeable battery pack comprises a series circuit composed of a plurality of cells, and wherein further two adjacent cells are electrically connected to one another by means of a connecting branch, and wherein the arrangement has a measuring device and which further comprises a switching device, and which is equipped to selectively connect exactly one connecting branch to a measuring input of the measuring device. The invention also relates to a rechargeable battery pack which has such an arrangement.[0003]An arrangement for measuring a single cell having a switching device and a measuring device is generally known. With thi...
Claims
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Login to View More IPC IPC(8): G01R31/36
CPCG01R31/3658G01R31/3606H01M10/482H01M10/441G01R19/16542G01R31/396Y02E60/10G01R31/382
InventorWIESNER, BERNDBECK, TOBIAS
OwnerMETABOWERKE