Device for an electrochemical energy storage device for separating an electrical connection and method for operating the same

Abstract

Device (110) for an electrochemical energy storage device (101) for separating an electrical connection.

Description

[0001] The invention is based on a device for an electrochemical energy storage device for separating an electrical connection, a method for operating a device for an electrochemical energy storage device for separating an electrical connection and a use of the device and / or the method according to the preamble of the independent claims. State of the art

[0002] Batteries used to power electrically powered vehicles, such as electric vehicles, plug-in vehicles, two- or three-wheelers, and commercial vehicles, have a high electrical voltage that can be dangerous for passers-by or passengers if they come into contact with a live part, for example after a fall.

[0003] In the event of undesirable events, such as an accident or a vehicle rollover, the battery must be disconnected promptly.

[0004] During an accident, a crash sensor typically sends information to the Vehicle Control Unit (VCU) and / or the Battery Management System (BMS) to signal that such a crash event has occurred. According to current technology, the BMS decides at what point a contactor is opened and the battery is disconnected from the powertrain.

[0005] Document CN 108 146 378 A discloses a safety airbag control system for electric vehicles.

[0006] The document US 2015 051 771 A1 discloses a system for discharging the electrical charge stored in a traction battery of an electric vehicle or hybrid electric vehicle.

[0007] Document KR 1998 0 045 752 U discloses a battery safety device for an electric vehicle which interrupts the voltage of each battery in the event of a vehicle collision.

[0008] Document KR 1999 0 021 079 U discloses a main power cut-off system that interrupts the power supply between the battery and the drive system when an electric vehicle has an accident.

[0009] Document CN 202 480 896 U discloses a safety redundancy device for an automotive battery system.

[0010] Document CN 207 028 887 U discloses a collision protection system for power battery packs.

[0011] The document DE 10 2013 223 320 A1 discloses a battery device with at least one battery cell, a safety system and a housing containing the at least one battery cell and the safety system.

[0012] The document DE 10 2012 209 762 A1 discloses a diagnostic device for an electrical energy storage device of a motor vehicle.

[0013] The object of the present invention is to further improve the state of the art. This object is achieved by the features of the independent claims. Disclosure of the inventionAdvantages of the invention

[0014] The procedure according to the invention with the characterizing features of the independent claims has the advantage that the device for an electrochemical energy storage device for separating at least one electrical connection comprises the following components: - at least one acceleration sensor to determine an acceleration of the electrochemical energy storage device; - at least one electronic control unit; - at least one switch for establishing or disconnecting the electrical connection between at least one terminal of the electrochemical energy storage device and at least one electrical consumer; wherein the acceleration sensor, the electronic control unit and / or the switch communicate by means of a wired and / or wireless connection.

[0015] This advantageously makes it possible to ensure a safe state of the electrochemical energy storage device, for example in the event of an accident or an impending accident.

[0016] Further advantageous embodiments are the subject of the subclaims.

[0017] The at least one acceleration sensor is arranged within a housing of the electrochemical energy storage device and / or on the housing of the electrochemical energy storage device.

[0018] A safe state can advantageously be established even if, for example, there is no acceleration sensor in a vehicle with the electrochemical energy storage system, or if the acceleration sensor delivers implausible values ​​and / or fails during operation.

[0019] The at least one acceleration sensor comprises an accelerometer and / or a gyroscope to detect an acceleration direction and / or acceleration magnitude for a plurality of directional axes.

[0020] The acceleration sensor advantageously detects a negative acceleration when the electrochemical energy storage device is decelerated and a positive acceleration when the electrochemical energy storage device is accelerated.

[0021] The wired connection comprises a communication line, in particular a CAN and / or a LIN bus, with a communication protocol that enables real-time communication between the acceleration sensor, the electronic control unit and / or the switch.

[0022] A method according to the invention for operating a device for an electrochemical energy storage device for separating an electrical connection comprises the following steps: a) detecting an acceleration value which represents an acceleration intensity and acceleration direction detected by the acceleration sensor for a plurality of directional axes of the electrochemical energy storage device; c) comparing the detected acceleration value with a predetermined maximum acceleration value, which represents a maximum permissible acceleration, and / or a further signal value, which represents an accident, in particular an impending accident; e) controlling the switch depending on the comparison;

[0023] The method according to the invention for operating a device for an electrochemical energy storage device for separating an electrical connection further comprises the following step: b) detecting at least one further signal quantity which represents an accident, in particular an impending accident;

[0024] The method according to the invention for operating a device for an electrochemical energy storage device for separating an electrical connection further comprises the following step: d) validation of the recorded acceleration value with at least one other recorded signal value;

[0025] The further signal quantity comprises an acceleration intensity and acceleration direction detected by means of at least one further acceleration sensor for a plurality of directional axes of the electrochemical energy storage device, at least one signal from an impact sensor and / or at least one signal from an emergency braking assistant.

[0026] According to an advantageous embodiment of the invention, a computer program is provided, comprising instructions which cause the device for operating a battery to carry out the method steps according to the invention.

[0027] Furthermore, a machine-readable storage medium is provided on which the computer program is stored.

[0028] Advantageously, a device according to the invention for an electrochemical energy storage device for disconnecting an electrical connection and / or a method according to the invention for operating a device for an electrochemical energy storage device for disconnecting an electrical connection is used in electrical energy storage devices for electric vehicles, fuel cell vehicles, hybrid vehicles, plug-in hybrid vehicles, aircraft, pedelecs or e-bikes, for portable devices for telecommunications or data processing, for electrical hand tools or kitchen appliances. Short description of the characters

[0029] Embodiments of the invention are illustrated in the drawing and explained in more detail in the following description.

[0030] Further advantages and advantageous embodiments of the inventive objects are illustrated by the drawings and explained in the following description. It should be noted that the drawings are for descriptive purposes only and are not intended to limit the invention in any way. Furthermore, the features described below may constitute an object of the invention, individually or in any combination, unless the context explicitly indicates otherwise.

[0031] They show: Fig. 1 is a schematic representation of an embodiment of a device according to the invention; and Fig. 2 a flowchart of an embodiment of a method according to the invention. Detailed description of the implementation examples

[0032] The same reference numerals denote the same device components in all figures.

[0033] Fig. 1 shows a schematic representation of an embodiment of a device 110 according to the invention for an electrochemical energy storage device 101. An electrically driven vehicle 100 comprises the electrochemical energy storage device 101, which comprises a plurality of electrochemical energy storage cells, an acceleration sensor 102 and an electronic control unit 103.

[0034] The electrically driven vehicle 100 further comprises an electronic control unit 104, an acceleration sensor 105 and an electrical consumer 106, for example an electric motor.

[0035] The electrical consumer can be electrically connected to connection poles 108 of the electrochemical energy storage device 101 by means of electrical connections 107 by means of a switch 109.

[0036] Fig.Figure 2 shows a flowchart of an embodiment of a method according to the invention. In step 200, an acceleration variable is detected, representing an acceleration magnitude and acceleration direction detected by an acceleration sensor 102 for a plurality of directional axes of the electrochemical energy storage device 101.

[0037] In step 201, at least one further signal quantity is detected which represents an accident, in particular an impending accident.

[0038] In step 202, the detected acceleration value is compared with a predefined maximum acceleration value, which represents a maximum permissible acceleration. If the detected acceleration value exceeds the predefined maximum acceleration value, the method continues in step 203. Otherwise, the method continues in step 200.

[0039] In step 203, the detected acceleration variable is validated using the at least one additional detected signal variable. For this purpose, in the illustrated embodiment, the detected acceleration variable is compared with the additional signal variable. If, for example, an accident or impending accident is determined based on the detected acceleration variable and / or the additional detected signal variable, the method continues in step 204. Otherwise, the method continues in step 200.

[0040] Advantageously, a speed of an electrical consumer 106, for example, an electric drive motor, can additionally be used to validate a current speed of the electrochemical energy storage device 101, for example, in an electrically powered vehicle 100, if a current speed is transmitted due to a communication line fault and misinterpreted as a crash event. This makes it possible to check whether a crash event has occurred, resulting in a sudden reduction in speed to zero, and to reliably decide whether or not to disconnect an electrical connection 107 by means of a switch 109.

[0041] Advantageously, the acceleration sensor 102 can also be used to detect a directed impact on the electrochemical energy storage device 101 and to make additional or independent decisions with regard to other systems, for example ABS, ESP, airbag systems and / or crash sensors.

[0042] In step 204, the switch 109, for example an electronic switch, a contactor and / or a relay, is controlled to disconnect an electrical connection between an electrochemical energy storage device 101 and an electrical load 106 in order to establish a safe state in the event of an accident. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] CN 108 146 378 A

[0005] US 2015 051 771 A1

[0006] KR 1998 0 045 752 U

[0007] KR 1999 0 021 079 U

[0008] CN 202 480 896 U

[0009] CN 207 028 887 U

[0010] DE 10 2013 223 320 A1

[0011] DE 10 2012 209 762 A1

[0012]

Claims

[1] Device (110) for an electrochemical energy storage device (101) for separating at least one electrical connection (107), comprising: - at least one acceleration sensor (102) to determine an acceleration of the electrochemical energy storage device (101); - at least one electronic control unit (103); - at least one switch (109) for establishing or disconnecting the electrical connection (107) between at least one terminal pole (108) of the electrochemical energy store (101) and at least one electrical consumer (106); wherein the acceleration sensor (102), the electronic control unit (103) and / or the switch (109) communicate by means of a wired and / or wireless connection. [2] Device (110) for an electrochemical energy store (101) for separating an electrical connection (107) according to claim 1, wherein the at least one acceleration sensor (102) is arranged within a housing of the electrochemical energy store (101) and / or on the housing of the electrochemical energy store (101). [3] Device (110) for an electrochemical energy storage device (101) for separating an electrical connection (107) according to one of the preceding claims, wherein the at least one acceleration sensor (102) comprises an accelerometer and / or a gyroscope in order to be able to detect an acceleration direction and / or acceleration intensity for a plurality of directional axes. [4] Device (110) for an electrochemical energy storage device (101) for disconnecting an electrical connection (107) according to one of the preceding claims, wherein the wired connection comprises a communication line, in particular a CAN and / or LIN bus, with a communication protocol that enables real-time communication between the acceleration sensor (102), the electronic control unit (103) and / or the switch (109). [5] Method for operating a device (110) for an electrochemical energy storage device (101) for separating an electrical connection (107), comprising the following steps: a) (200) detecting an acceleration variable which represents an acceleration intensity and acceleration direction detected by means of the acceleration sensor (102) for a plurality of directional axes of the electrochemical energy storage device (101); c) (202) comparing the detected acceleration value with a predetermined maximum acceleration value, which represents a maximum permissible acceleration, and / or a further signal value, which represents an accident, in particular an impending accident; e) (204) controlling the switch (109) depending on the comparison; [6] A method for operating a device (110) for an electrochemical energy storage device (101) for separating an electrical connection (107) according to claim 5, further comprising the following step: b) (201) detecting at least one further signal quantity which represents an accident, in particular an impending accident; [7] A method for operating a device (110) for an electrochemical energy storage device (101) for separating an electrical connection (107) according to one of claims 5 or 6, further comprising the following step: d) (203) validation of the detected acceleration value with at least one other detected signal value; [8] Method for operating a device (110) for an electrochemical energy store (101) for separating an electrical connection (107) according to one of claims 5 to 7, wherein the further signal variable comprises an acceleration intensity and acceleration direction for a plurality of directional axes of the electrochemical energy store (101) detected by means of at least one further acceleration sensor (105), at least one signal from an impact sensor and / or at least one signal from an emergency braking assistant. [9] A computer program comprising instructions causing the device (110) according to any one of claims 1 to 4 to carry out the method steps according to any one of claims 5 to 8. [10] A machine-readable storage medium on which the computer program according to claim 9 is stored. [11] Use of a device (110) according to one of claims 1 to 4 and / or a method according to one of claims 5 to 8 in electrical energy storage devices for electric vehicles, fuel cell vehicles, hybrid vehicles, plug-in hybrid vehicles, aircraft, pedelecs or e-bikes, for portable devices for telecommunications or data processing, for electrical hand tools or kitchen appliances.

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