Battery management system for accumulators of a semi-modular element
AssigneeLimatech
InventorsLuc POUYADOU, Maxime DI MEGLIO, Florence ROBIN
Life of this patent
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Abstract
The present invention relates to a system for managing accumulator batteries (BMS) of a semi-modular element comprising a plurality of lithium cell elements connected in series to form a line, and comprising at least two parallel lines constituting the semi-modular element, and at least one detection circuit characterized in that the detection circuit comprises at least one discharge or short-circuit detection device and at least one device for monitoring the voltage and temperature of at least one, and preferably all, of the cell elements, the detection circuit controlling a circuit breaker device comprising one switching device per line.
Claims16
Battery management system (BMS, 3) for accumulators of a semi-modular element comprising a plurality of lithium cell elements (20) connected in series to form a line, said battery management system for accumulators comprising at least two serial lines connected in parallel constituting the semi-modular element, and at least one detection circuit, characterized in that the detection circuit comprises at least one discharge or short-circuit detection device and at least one device for monitoring the voltage and temperature of a cell element, the detection circuit controlling a circuit breaker device comprising at least one switching device (11) per line, preferably only one per line, and connected on the one hand to the negative or positive pole of each set of cell elements (20) or each battery and on the other hand to the positive or negative terminal, respectively, of the battery, the switching device (11) comprising, for each line, a load breaking device, a discharge breaking device, and electronic components limiting the current at the load, preferably only at the load, and said load breaking device comprising at least two, preferably only two, MOSFETs (M1, M2) per line;
- a first MOSFET (M1) performing a circuit break in the event of discharge below a threshold or during a short circuit, a second MOSFET (M2) performing a load break in the event of voltage or temperature overshoot of an element of said circuit, the electronic components such as a set of diodes, resistors, capacitors, for example around the second MOSFET (M2), performing a current limitation at the load.
Battery management system (BMS, 3) for accumulators of a semi-modular element according to one of the preceding claims, wherein the detection circuit comprises one or more of the following functionalities:
- Cell voltage balancing;
- Detection of excessively low voltage and open circuit
- Detection, by a voltage measurement circuit, of short-circuit, deep discharge and overcurrent to trigger the disconnection of a group of cells by opening the circuit
- Detection of excessively high voltage of one of the battery cells and opening of the circuit.
High-current, semi-modular, series and parallel battery pack (1) consisting of lithium accumulator cells of the same characteristics connected in series to form a line by connections in a given direction S corresponding to the direction of the high currents to obtain the necessary voltage, and intended to be able to be associated in parallel with another line of accumulator cells, said pack comprising a management system (3) according to one of the preceding claims, and characterized in that:
- a pair of upper (71) and lower (72) bezels that delimit a set of cylindrical housings with a square or polygonal or circular section defining, in the same direction S, at least one line of cylindrical housings with a square or polygonal section each holding a lithium accumulator cell;
- the connections between the accumulator cells of the same line in the direction S are ensured by wide tongues (9) connecting, on each upper or lower face of the module, each pair of adjacent cells connected in series by their poles of opposite polarity in the first direction S, the connecting tongues (9) on one face being offset by one cell on the other face;
- the bezels (71, 72) comprise at least two lines of housings parallel to the direction S in which at least two lines of cells are arranged in a direction perpendicular to S and interconnected either by thin tongues acting as a fuse or by resettable fuses (F, FIG. 2), in the direction P perpendicular to the direction S, each fuse (F) connecting two cells belonging to two different parallel lines to make a parallel connection between each cell of two parallel sets of serial cells.
Dependencies are inferred from the claim text.