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DE-102024132045-B4 - Electrical energy storage system and system comprising the energy storage

DE102024132045B4DE 102024132045 B4DE102024132045 B4DE 102024132045B4DE-102024132045-B4

Abstract

The invention relates to an electrical energy storage device (1) for supplying an electrically driven processing device (2) with electrical drive power (AL) and/or a further electrical energy storage device (1''') for the processing device (2) with electrical charging power (LL), wherein the energy storage device (1) comprises: - a series connection of electrical energy storage cells (Z_1, ..., Z_i, ..., Z_n), - at least one series circuit of electrical measuring resistors (R_1, ..., R_i, ..., R_n), - electrical measuring switches (S_1, ..., S_i, ..., S_n), wherein the measuring switches (S_1, ..., S_i, ..., S_n) are connected between one end (ZE) of the series connection of the energy storage cells (Z_1, ..., Z_i, ..., Z_n) and one end (RE) of the series connection of the measuring resistors (R_1, ..., R_i, ..., R_n) and between at least one node (ZK1, ..., ZKn-1) of the next energy storage cells (Z_1, ..., Z_i, ..., Z_n) and at least one node (RK1, ... RKn-1) of the next measuring resistors (R_1, ..., R_i, ..., R_n) to assign at least one respective measuring resistor (R_1, ..., R_i, ..., R_n) to at least one respective energy storage cell (Z_1, ..., Z_i, ..., Z_n), - a measuring device (3), wherein the measuring device (3) is designed for measuring a measured voltage quantity (MSP) dropping across at least one measuring resistor (R_1), and - a control device (4), wherein the control device (4) is configured to control the measuring switches (S_1, ..., S_i, ..., S_n) for determining individual charge states (LZ1, ..., LZi, ..., LZn) of the energy storage cells (Z_1, ..., Z_i, ..., Z_n) and proper operating states (FS1, ..., FSi, ..., FSn) of the measuring switches (S_1, ..., S_i, ..., S_n) depending on measurements of the measured voltage quantity (MSP), - where the ratios of resistance values of the measuring resistors (R_1, ..., R_i, ..., R_n) to nominal voltage values of the associated energy storage cells (Z_1, ..., Z_i, ..., Z_n) are unequal to an equalization of changes in the individual charge states (LZ1, ..., LZi, ..., LZn) caused by the determination.

Inventors

  • Malte VON HOFEN

Assignees

  • ANDREAS STIHL AG & CO. KG

Dates

Publication Date
20260513
Application Date
20241104

Claims (8)

  1. Electrical energy storage device (1) for supplying an electrically driven processing device (2) with electrical drive power (AL) and/or a further electrical energy storage device (1''') for the processing device (2) with electrical charging power (LL), wherein the energy storage device (1) comprises: - a series connection of electrical energy storage cells (Z_1, ..., Z_i, ..., Z_n), - at least one series connection of electrical measuring resistors (R_1, ..., R_i, ..., R_n), - electrical measuring switches (S_1, ..., S_i, ..., S_n), wherein the measuring switches (S_1, ..., S_i, ..., S_n) are connected between an end (ZE) of the series connection of the energy storage cells (Z_1, ..., Z_i, ..., Z_n) and an end (RE) of the series connection of the measuring resistors (R_1, ..., R_i, ..., R_n) and between at least one node (ZK1, ..., ZKn-1) nearest Energy storage cells (Z_1, ..., Z_i, ..., Z_n) and at least one node (RK1, ... RKn-1) of nearest measuring resistors (R_1, ..., R_i, ..., R_n) are connected in series to assign at least one respective measuring resistor (R_1, ..., R_i, ..., R_n) to at least one respective energy storage cell (Z_1, ..., Z_i, ..., Z_n), - a measuring device (3), wherein the measuring device (3) is configured to measure a measured voltage quantity (MSP) dropping across at least one measuring resistor (R_1), and - a control device (4), wherein the control device (4) is configured to control the measuring switches (S_1, ..., S_i, ..., S_n) for determining individual charge states (LZ1, ..., LZi, ..., LZn) of the energy storage cells (Z_1, ..., Z_i, ..., Z_n) and of proper The functional states (FS1, ..., FSi, ..., FSn) of the measuring switches (S_1, ..., S_i, ..., S_n) are configured depending on measurements of the measured voltage quantity (MSP), - where the ratios of the resistance values of the measuring resistors (R_1, ..., R_i, ..., R_n) to the nominal voltage values of the associated energy storage cells (Z_1, ..., Z_i, ..., Z_n) are unequal to an equalization of changes in the individual charge states (LZ1, ..., LZi, ..., LZn) caused by the determination.
  2. Electrical energy storage device (1) according to the preceding claim, - wherein the measuring switches (S_1, ..., S_i, ..., S_n) are connected in series such that in a closed switching state (closed) of a measuring switch (S_1, ..., S_i, ..., S_n) a measuring resistor (R_1, ..., R_i, ..., R_n) and an energy storage cell (Z_1, ..., Z_i, ..., Z_n) are connected in series and associated with each other.
  3. Electrical energy storage device (1) according to one of the preceding claims, - wherein an energy storage cell (Z_1), in particular the series connection of the energy storage cells (Z_1, ..., Z_i, ..., Z_n) with a start (ZA), is electrically connected to a reference potential (GND), and/or - wherein a measuring resistor (R_1), in particular the series connection of the measuring resistors (R_1, ..., R_i, ..., R_n) with a start (RA), is electrically connected to the reference potential (GND), and/or - wherein the measuring switches (S_1, ..., S_i, ..., S_n) are electrically connected to the reference potential (GND) by means of at least one energy storage cell (Z_1, ..., Z_i, ..., Z_n) and/or at least one measuring resistor (R_1, ..., R_i, ..., R_n).
  4. Electrical energy storage device (1) according to any of the preceding claims, - wherein the nominal voltage values are equal, and/or - wherein the resistance values are unequal.
  5. Electrical energy storage device (1) according to one of the preceding claims, - wherein the ratios and/or time durations (T1, T2) and/or a time sequence and/or a temporal frequency (ZH) of the control of the measuring switches (S_1, ..., S_i, ..., S_n) are such that, on a temporal average, the changes in the individual charge states (LZ1, ..., LZi, ..., LZn) are aligned, in particular equal.
  6. Electrical energy storage device (1) according to one of the preceding claims, - wherein the control device (4) is configured for determining the individual charge states (LZ1, ..., LZi, ..., LZn), a measuring switch (S_n) at the end (ZE) of the series connection of the energy storage cells (Z_1, ..., Z_i, ..., Z_n) and at the end (RE) of the series connection of the measuring resistors (R_1, ..., R_i, ..., R_n) in a closed to control a switching state (closed) and thereby in successive steps control another measuring switch (S_1, ..., S_i, ..., S_n-1) to a closed switching state (closed) until all further measuring switches (S_1, ..., S_i, ..., S_n-1) have been controlled, and/or - wherein the control device (4) is designed for determining the proper operating states (FS1, ..., FSi, ..., FSn), to control a measuring switch (S_1, ..., S_i, ..., S_n) to a closed switching state (closed) in successive steps until all measuring switches (S_1, ..., S_i, ..., S_n) have been controlled.
  7. Electrical energy storage device (1) according to one of the preceding claims, wherein the energy storage device (1) comprises: - a determination device (5), wherein the determination device (5) is configured to determine the individual charge states (LZ1, ..., LZi, ..., LZn) and the proper operating states (FS1, ..., FSi, ..., FSn) depending on the switching states (closed) of the measuring switches (S_1, ..., S_i, ..., S_n) and the measurements of the measured voltage quantity (MSP).
  8. System (10), wherein the system (10) comprises: - the electrical energy storage device (1) according to any of the preceding claims and - an electrically powered processing device (2), - in particular wherein the processing device (2) is ground- and/or hand-operated, in particular hand-carried, and/or a garden, forestry, construction and/or soil cultivation device (2'), in particular a saw, or a pole pruner, or a hedge trimmer, or a hedge cutter, or a shrub cutter, or a branch cutter, or a cut-off saw, or a blower, or a leaf blower, or a vacuum cleaner, or a leaf vacuum, or a cleaning device, or a pressure washer, or a sweeper, or a sweeping roller, or a sweeping brush, or a lawnmower (2"), or grass shears, or a brush cutter, or a scarifier, and/or - in particular wherein the processing device (2) is an autonomous mobile processing robot (2'''), in particular a Robotic lawnmower (2'''').

Description

SCOPE OF APPLICATION AND STATE OF THE ART The invention relates to an electrical energy storage device and a system comprising the energy storage device. The EP 4 166 962 A1 Disclosing an electrical energy storage device, particularly for a handheld power tool, comprising: a series connection of a number of energy storage cells, wherein one energy storage cell of the energy storage cells is connected to a reference potential; a series connection of a number of measuring resistors; a number of measuring circuit devices, wherein a first measuring circuit device of the number of measuring circuit devices is inserted between the series connection of the number of energy storage cells and the series connection of the number of measuring resistors, and wherein an associated measuring circuit device is inserted between connection nodes of adjacent energy storage cells and connection nodes of adjacent measuring resistors; a balancing circuit device that is inserted between a measuring resistor of the number of measuring resistors and the reference potential; a measuring unit that measures a voltage drop across a measuring resistor of the number of measuring resistors; and a control unit configured to control the measuring circuit devices and the balancing circuit device depending on a switching state of the measuring circuit devices and the balancing circuit device. and to determine the state of charge of the energy storage cells based on the voltage measured by the measuring unit, and to monitor the proper functioning of the measuring circuitry. The DE 10 2015 219 822 A1 The document discloses a means of transportation, two arrangements, and a device for monitoring the voltage of a plurality of electrochemical cells of an energy storage device. The device comprises: a plurality of electrical resistors galvanically connected in series, a plurality of electrical input ports galvanically connected in series, each with a first terminal and a second terminal, a plurality of electrical switches, and an evaluation unit, wherein the electrical switches are arranged such that each switch is configured to electrically connect a terminal of an input port to a terminal of a resistor, and the evaluation unit is configured to selectively close the switches and thereby determine an electrical measurement with respect to the terminals of a first resistor of the plurality of resistors. TASK AND SOLUTION The invention aims to provide an electrical energy storage device and a system comprising the energy storage device, which in particular each have improved properties. The invention solves this problem by providing an electrical energy storage device as described in the independent claim. Advantageous embodiments of the invention are described in the dependent claims. The electrical energy storage device according to the invention is designed to supply an electrically driven processing device with electrical drive power and/or a further electrical energy storage device for the processing device with electrical charging power. The energy storage device comprises at least, in particular, a series connection of electrical energy storage cells, at least, in particular, a series connection of electrical measuring resistors, electrical measuring switches, a measuring device, and a control device. The measuring switches are connected between, in particular, one end of the series connection of the energy storage cells and, in particular, a corresponding end of the series connection of the measuring resistors, as well as between at least one node of the next energy storage cells, in particular of the series connection, and at least one node of the next measuring resistors, in particular of the series connection, for the purpose of assigning at least one respective measuring resistor, in particular the measuring resistors, to at least one respective energy storage cell, in particular the energy storage cells, in particular directly and/or permanently. The measuring device is designed to measure a measuring voltage quantity, in particular directly, dropping across at least, in particular, one measuring resistor, in particular the measuring resistors. The control unit is designed to control the measuring switches for determining the individual charge states of the energy storage cells, particularly those connected in series, and for verifying the proper functioning of the measuring switches based on measurements of the measured voltage. Ratios between the resistance values of the measuring resistors and the nominal voltage values of the associated energy storage cells are used to compensate for changes in the individual charge states caused by these measurements. Determining the proper operating states can cause changes in individual charge states or an unequal [result]. The unequal ratios can, through the determination of the individual charge states, cause an opposing or counteracting unequal discharge or load of the energy storage cells and