CN112857199A - Battery safety detection device and battery management system - Google Patents

Battery safety detection device and battery management system Download PDF

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Publication number
CN112857199A
CN112857199A CN202110205120.5A CN202110205120A CN112857199A CN 112857199 A CN112857199 A CN 112857199A CN 202110205120 A CN202110205120 A CN 202110205120A CN 112857199 A CN112857199 A CN 112857199A
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China
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conductive elements
strain
battery
battery safety
safety detection
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CN202110205120.5A
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Chinese (zh)
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周号
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Zhuhai Maiju Microelectronics Co Ltd
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Zhuhai Maiju Microelectronics Co Ltd
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Priority to CN202110205120.5A priority Critical patent/CN112857199A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
    • G01B7/22—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge using change in capacitance
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Secondary Cells (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

The present disclosure provides a battery safety detection device, including: at least one strain sensing part disposed on at least one surface of a battery of the battery device, the strain sensing part being capable of generating a strain electrical signal based on at least a deformation of the battery device, the strain electrical signal being indicative of at least an occurrence of the deformation; the strain sensing part comprises at least one strain sensing device, the strain sensing device comprises a plurality of conductive elements, the conductive elements are uniformly arranged into a two-dimensional array, and each conductive element is insulated from other conductive elements; the strain sensing device can enable the position, corresponding to the deformation of the battery, of the two-dimensional array to deform in response to the deformation of the battery, and the strain sensing portion generates a strain electric signal based on the deformation of the two-dimensional array. The present disclosure also provides a battery management system.

Description

Battery safety detection device and battery management system
Technical Field
The present disclosure belongs to the technical field of battery safety detection, and particularly relates to a battery safety detection device and a battery management system.
Background
The lithium battery can deform when being subjected to external force, and bulges can be generated after the battery is aged. When the above problems occur in the lithium battery, problems such as internal short circuit, fire explosion, etc. will occur. Safety inspection of lithium batteries is therefore essential.
How to effectively and accurately detect the deformation of the battery and how to predict the faults of the battery, which is a problem to be solved in the field of battery safety.
Disclosure of Invention
In order to solve one of the above technical problems, the present disclosure provides a battery safety detection device and a battery management system.
According to an aspect of the present disclosure, there is provided a battery safety detecting apparatus including:
at least one strain sensing portion disposed on at least one surface of a battery device, the strain sensing portion capable of generating a strain electrical signal based at least on a deformation of the battery device, the strain electrical signal being indicative of at least an occurrence of the deformation;
the strain sensing part comprises at least one strain sensing device, the strain sensing device comprises a plurality of conductive elements, the conductive elements are uniformly arranged into a two-dimensional array, and each conductive element is insulated from other conductive elements; the strain sensing device can respond to deformation of a battery to enable the position, corresponding to the deformation of the battery, of the two-dimensional array to deform, and the strain sensing portion generates the strain electric signal based on the deformation of the two-dimensional array.
According to the battery safety detection device of at least one embodiment of the present disclosure, the strain electric signal includes a self-capacitance change signal of any one of the conductive elements of the two-dimensional array.
According to the battery safety detection device of at least one embodiment of the present disclosure, the strain electric signal includes a mutual capacitance change signal between two adjacent conductive elements of the two-dimensional array.
According to the battery safety detection apparatus of at least one embodiment of the present disclosure, the two-dimensional array includes a plurality of conductive elements arranged in a first direction and a plurality of conductive elements arranged in a second direction, the first direction being perpendicular to the second direction.
According to the battery safety detection apparatus of at least one embodiment of the present disclosure, the two adjacent conductive elements are two conductive elements adjacent in a first direction or two conductive elements adjacent in a second direction, and the first direction is perpendicular to the second direction.
According to the battery safety detection device of at least one embodiment of the present disclosure, the strain electric signal includes a mutual capacitance change signal between any two non-adjacent conductive elements of the two-dimensional array.
According to the battery safety detection apparatus of at least one embodiment of the present disclosure, the strain sensing part includes two strain sensing devices, the two strain sensing devices are oppositely disposed, and an insulation gap is disposed between the two strain sensing devices.
According to the battery safety detection apparatus of at least one embodiment of the present disclosure, the strain sensing part includes a first strain sensing device and a second strain sensing device, the conductive elements are conductive strips, the first strain sensing device includes a plurality of first conductive strips arranged along a first direction, the second strain sensing device includes a plurality of second conductive strips arranged along a second direction, two adjacent first conductive strips are insulated from each other, two adjacent second conductive strips are insulated from each other, and the first direction is perpendicular to the second direction.
According to the battery safety detection apparatus of at least one embodiment of the present disclosure, the strain electric signal includes a mutual capacitance change signal between each first conductive strip of the first strain sensing device and each second conductive strip of the second strain sensing device.
According to the battery safety detection apparatus of at least one embodiment of the present disclosure, the strain sensing part includes a first strain sensing device and a second strain sensing device, the first strain sensing device includes a first rectangular conductive element array, each first conductive element of the first rectangular conductive element array is insulated from each other, the second strain sensing device includes a second rectangular conductive element array, each second conductive element of the second rectangular conductive element array is insulated from each other, and each first conductive element of the first rectangular conductive element array is disposed opposite to each second conductive element of the second rectangular conductive element array.
According to the battery safety detection device of at least one embodiment of the present disclosure, the strain electric signal includes a mutual capacitance change signal between the first conductive element and the second conductive element of the first rectangular conductive element array and the second rectangular conductive element array which are oppositely arranged.
According to the battery safety inspection device of at least one embodiment of the present disclosure, the insulation gap is filled with a flexible insulating substance.
According to the battery safety detection apparatus of at least one embodiment of the present disclosure, a driving electrical signal is simultaneously applied to all conductive elements of the strain sensing device, and the self-capacitance of each conductive element is simultaneously measured, and if the self-capacitance of the conductive element changes, a self-capacitance change signal is generated.
According to the battery safety detection apparatus of at least one embodiment of the present disclosure, a driving electrical signal is sequentially applied to each of all conductive elements of the strain sensing device, and the self-capacitance of each conductive element is sequentially measured, and if the self-capacitance of the conductive element changes, a self-capacitance change signal is generated.
According to the battery safety detection device of at least one embodiment of the present disclosure, the deformation degree is judged based on the magnitude of the self-capacitance change signal, and the deformation position is judged based on the position of the conductive element with the changed self-capacitance in the two-dimensional array.
According to the battery safety detection device of at least one embodiment of the present disclosure, for the two-dimensional array of conductive elements arranged in the first direction, divided into a plurality of groups in the second direction, the following operations are simultaneously performed for each group of conductive elements of the plurality of groups of conductive elements:
a drive electrical signal is sequentially applied to a mutual capacitor formed by two adjacent conductive elements, the mutual capacitance is measured, and a mutual capacitance change signal is generated if the mutual capacitance changes.
According to the battery safety detection device of at least one embodiment of the present disclosure, for the two-dimensional array of conductive elements arranged in the first direction, the conductive elements are divided into a plurality of groups in the second direction, and the following operations are sequentially performed for each group of conductive elements of the plurality of groups of conductive elements:
a drive electrical signal is sequentially applied to a mutual capacitor formed by two adjacent conductive elements, the mutual capacitance is measured, and a mutual capacitance change signal is generated if the mutual capacitance changes.
According to the battery safety detection device of at least one embodiment of the present disclosure, for the two-dimensional array of conductive elements arranged in the second direction, divided into a plurality of groups in the first direction, the following operations are simultaneously performed for each group of conductive elements of the plurality of groups of conductive elements:
a drive electrical signal is sequentially applied to a mutual capacitor formed by two adjacent conductive elements, the mutual capacitance is measured, and a mutual capacitance change signal is generated if the mutual capacitance changes.
According to the battery safety detection device of at least one embodiment of the present disclosure, for the two-dimensional array of conductive elements arranged in the second direction, the conductive elements are divided into a plurality of groups along the first direction, and the following operations are sequentially performed for each group of conductive elements of the plurality of groups of conductive elements:
a drive electrical signal is sequentially applied to a mutual capacitor formed by two adjacent conductive elements, the mutual capacitance is measured, and a mutual capacitance change signal is generated if the mutual capacitance changes.
According to the battery safety detection device of at least one embodiment of the present disclosure, for the two-dimensional array of conductive elements arranged in the first direction, divided into a plurality of groups in the second direction, the following operations are simultaneously performed for each group of conductive elements of the plurality of groups of conductive elements:
a driving electric signal is sequentially applied to a mutual capacitor formed by two conductive elements with a predetermined conductive element interval, mutual capacitance is measured, and a mutual capacitance change signal is generated if the mutual capacitance changes.
According to the battery safety detection device of at least one embodiment of the present disclosure, for the two-dimensional array of conductive elements arranged in the second direction, divided into a plurality of groups in the first direction, the following operations are simultaneously performed for each group of conductive elements of the plurality of groups of conductive elements:
a driving electric signal is sequentially applied to a mutual capacitor formed by two conductive elements with a predetermined conductive element interval, mutual capacitance is measured, and a mutual capacitance change signal is generated if the mutual capacitance changes.
According to the battery safety detection device of at least one embodiment of the present disclosure, for the two-dimensional array of conductive elements arranged in the first direction, the conductive elements are divided into a plurality of groups in the second direction, and the following operations are sequentially performed for each group of conductive elements of the plurality of groups of conductive elements:
a driving electric signal is sequentially applied to a mutual capacitor formed by two conductive elements with a predetermined conductive element interval, mutual capacitance is measured, and a mutual capacitance change signal is generated if the mutual capacitance changes.
According to the battery safety detection device of at least one embodiment of the present disclosure, for the two-dimensional array of conductive elements arranged in the second direction, the conductive elements are divided into a plurality of groups along the first direction, and the following operations are sequentially performed for each group of conductive elements of the plurality of groups of conductive elements:
a driving electric signal is sequentially applied to a mutual capacitor formed by two conductive elements with a predetermined conductive element interval, mutual capacitance is measured, and a mutual capacitance change signal is generated if the mutual capacitance changes.
According to the battery safety detection device of at least one embodiment of the present disclosure, the two-dimensional array includes a first sub-array and a second sub-array, and the first sub-array and the second sub-array are disposed within a same plane area;
the first sub-array comprises a plurality of first series groups of conductive elements comprising a plurality of conductive elements connected in series along a first direction, the plurality of first series groups of conductive elements being arranged along a second direction; the first series conductive element groups are insulated;
the second sub-array comprises a plurality of second series-connected groups of conductive elements, the second series-connected groups of conductive elements comprising a plurality of conductive elements connected in series along a second direction, the plurality of second series-connected groups of conductive elements being arranged along the first direction; the second series connection conductive element groups are insulated;
the first subarray and the second subarray are insulated;
the first direction and the second direction are perpendicular to each other.
According to the battery safety detection apparatus of at least one embodiment of the present disclosure, the shape of the conductive elements of the first sub-array is the same as the shape of the conductive elements of the second sub-array.
According to the battery safety detection apparatus of at least one embodiment of the present disclosure, the driving electric signals are simultaneously applied to all the first series conductive element groups of the first sub-array and all the second series conductive element groups of the second sub-array, the self-capacitances of all the first series conductive element groups of the first sub-array and all the second series conductive element groups of the second sub-array are simultaneously measured, and the self-capacitance change signal is generated if the self-capacitances are changed.
According to the battery safety detection apparatus of at least one embodiment of the present disclosure, the deformation position of the two-dimensional array is determined based on the position information of the first series conductive element group in which at least one self-capacitance of the first sub-array changes in the first sub-array and the position information of the second series conductive element group in which at least one self-capacitance of the second sub-array changes in the second sub-array.
According to the battery safety detection apparatus of at least one embodiment of the present disclosure, the driving electrical signals are simultaneously applied to all the first series conductive element groups of the first sub-array and all the second series conductive element groups of the second sub-array, and the mutual capacitances of the mutual capacitors formed by the respective first series conductive element groups of the first sub-array and the respective second series conductive element groups of the second sub-array are simultaneously measured, and if the mutual capacitances are changed, a mutual capacitance change signal is generated.
According to the battery safety detection apparatus of at least one embodiment of the present disclosure, based on the position information of the first series conductive element group of the mutual capacitor in the first sub-array and the position information of the second series conductive element group in the second sub-array, in which the mutual capacitance changes, the deformation position of the two-dimensional array is determined.
The battery safety detection device according to at least one embodiment of the present disclosure is characterized in that the strain sensing part further includes a first substrate layer and a second substrate layer, and the strain sensing device is disposed between and held by the first substrate layer and the second substrate layer.
According to the battery safety detection device of at least one embodiment of this disclosure, the first substrate layer and the second substrate layer are insulating materials.
According to the battery safety detection device of at least one embodiment of this disclosure, the first substrate layer and the second substrate layer are flexible substrates.
According to the battery safety detection device of at least one embodiment of the present disclosure, the strain sensing part further includes a first substrate layer and a second substrate layer, and the two strain sensing devices are respectively disposed on the first substrate layer and the second substrate layer.
According to the battery safety detection device of at least one embodiment of the present disclosure, the strain sensing part further includes a support part disposed between the first substrate layer and the second substrate layer.
According to the battery safety detection device of at least one embodiment of the present disclosure, the support portion is disposed at an edge of the first substrate layer and the second substrate layer.
According to the battery safety detecting apparatus of at least one embodiment of the present disclosure, the supporting portion includes a plurality of discrete supporting portions, or the supporting portion is an integrated structure.
According to the battery safety detection device of at least one embodiment of this disclosure, the first substrate layer and the second substrate layer are insulating materials.
According to the battery safety detection device of at least one embodiment of this disclosure, the first substrate layer and the second substrate layer are flexible materials.
According to the battery safety detecting apparatus of at least one embodiment of the present disclosure, the strain sensing part may be disposed between two adjacent batteries.
According to the battery safety detecting apparatus of at least one embodiment of the present disclosure, the strain sensing part may be disposed between the battery and the case.
According to the battery safety detection apparatus of at least one embodiment of the present disclosure, the strain sensing part may further generate the strain electric signal based on a deformation of a case of the battery apparatus.
The battery safety detection device according to at least one embodiment of the present disclosure further includes a drive detection unit that applies a drive electric signal to the strain sensing unit and detects the strain electric signal generated by the strain sensing unit.
According to the battery safety detection device of at least one embodiment of the present disclosure, the driving detection part includes: a driving circuit for providing a driving electric signal to the strain sensing part; a detection circuit for detecting the strain electrical signal; and the controller controls the driving circuit to provide a driving signal for the strain sensing part, processes the strain electric signal obtained by the detection circuit and generates a processed strain electric signal.
According to the battery safety detection device of at least one embodiment of the present disclosure, the driving detection unit further includes a memory that stores the strain electric signal processed by the controller.
According to the battery safety detection device of at least one embodiment of the present disclosure, the detection circuit includes a capacitance detection circuit that detects a self-capacitance change signal of each conductive element and/or a mutual capacitance change signal between two conductive elements.
According to the battery safety detection apparatus of at least one embodiment of the present disclosure, the capacitance detection circuit includes a charge signal conversion sub-circuit that converts self-capacitance accumulated charges of respective conductive elements into a voltage signal and/or converts mutual capacitance accumulated charges between two conductive elements into a voltage signal.
According to the battery safety detection device of at least one embodiment of the present disclosure, the capacitance detection circuit further includes a signal post-processing circuit, the signal post-processing circuit performs post-processing on the voltage signal output by the charge signal conversion sub-circuit, and the post-processing includes filtering processing and analog-to-digital conversion processing.
According to the battery safety detection apparatus of at least one embodiment of the present disclosure, the charge signal conversion sub-circuit includes a first amplifier; a drive signal is applied to the self-capacitance or the mutual capacitance; the first amplifier converts the accumulated charges of the self capacitance or the mutual capacitance into a voltage signal.
According to the battery safety detection apparatus of at least one embodiment of the present disclosure, the signal post-processing circuit further includes a demodulator, an oscillator, an accumulator, and a register.
According to the battery safety detection device of at least one embodiment of the present disclosure, the capacitance detection circuit includes a charge signal conversion sub-circuit that converts self-capacitance accumulated charges of respective conductive elements into a frequency signal and/or converts mutual capacitance accumulated charges between two conductive elements into a frequency signal.
According to the battery safety detecting apparatus of at least one embodiment of the present disclosure, the charge signal conversion sub-circuit includes a constant current source, a first comparator, a second comparator, and a multiplexer, the constant current source is controlled to charge or discharge the self capacitance or the mutual capacitance, triangular waveform voltage signals generated by charging and discharging of the self-capacitance or the mutual capacitance are respectively input to the first comparator and the second comparator, the first comparator has a first threshold voltage, the second comparator has a second threshold voltage, the first comparator and the second comparator convert the triangular waveform voltage signal into a square wave electric signal, the multiplexer adjusts the amplitude of the square wave electric signal, and the frequency of the square wave electric signal output by the multiplexer is a function of the charging and discharging current of the self capacitor or the mutual capacitor.
According to the battery safety detection device of at least one embodiment of the present disclosure, the capacitance detection circuit includes a charge signal conversion sub-circuit that converts self-capacitance accumulated charges of respective conductive elements into a pulse width signal and/or converts mutual capacitance accumulated charges between two conductive elements into a pulse width signal.
According to the battery safety detection device of at least one embodiment of the present disclosure, the charge signal conversion sub-circuit includes a constant current source, a transconductance amplifier, and a comparator, the constant current source is controlled to charge or discharge the self-capacitance or the mutual capacitance, the self-capacitance or the mutual capacitance is connected across an input end and an output end of the transconductance amplifier, an output of the transconductance amplifier is a triangular waveform voltage signal, the comparator compares the triangular waveform voltage signal with a threshold voltage signal, and when the triangular waveform voltage signal is greater than the threshold voltage signal, the comparator outputs a high level.
According to the battery safety detection apparatus of at least one embodiment of the present disclosure, the capacitance detection circuit includes a charge signal conversion sub-circuit that converts self-capacitance accumulated charges of respective conductive elements into digital signals and/or converts mutual capacitance accumulated charges between two conductive elements into digital signals.
According to the battery safety detection apparatus of at least one embodiment of the present disclosure, the charge signal conversion sub-circuit includes an integrator and a comparator, the integrator is controlled to accumulate the accumulated charges of the mutual capacitance or the self capacitance and convert the accumulated charges into a voltage signal, and the integrator is controlled to accumulate the accumulated charges of a capacitance difference of the self capacitance or the mutual capacitance and a reference capacitance and convert the accumulated charges into a voltage signal, and the comparator outputs a high level or a low level based on the positive or negative of the voltage signal.
According to the battery safety detection device of at least one embodiment of the present disclosure, the capacitance detection circuit includes a charge signal conversion sub-circuit that converts self-capacitance accumulated charges of the respective conductive elements into a voltage signal and/or converts mutual capacitance accumulated charges between two conductive elements into a voltage signal, and a signal amplification sub-circuit that amplifies the voltage signal to generate an amplified voltage signal.
According to the battery safety detection device of at least one embodiment of the present disclosure, the capacitance detection circuit further includes a signal post-processing sub-circuit including at least a filter and an analog-to-digital converter.
According to the battery safety detection apparatus of at least one embodiment of the present disclosure, the charge signal conversion sub-circuit includes a reference capacitor, a first amplifier that converts the accumulated charge of the self-capacitor or the mutual capacitor into a first voltage signal, and a second amplifier that converts the accumulated charge of the reference capacitor into a second voltage signal.
According to the battery safety detection device of at least one embodiment of the present disclosure, the signal amplification sub-circuit includes a common mode amplifier, and the common mode amplifier amplifies and outputs a difference value between the first voltage signal and the second voltage signal.
According to the battery safety detection device of at least one embodiment of the present disclosure, the charge signal conversion sub-circuit includes a reference capacitor, a first amplifier, a second amplifier, and a rectifier & filter, the first amplifier converts the accumulated charge of the self capacitor or the mutual capacitor into a first voltage signal, the second amplifier converts the accumulated charge of the reference capacitor into a second voltage signal, and the rectifier & filter rectifies and filters the first voltage signal and the second voltage signal respectively and outputs the rectified and filtered signals.
According to the battery safety detection device of at least one embodiment of the present disclosure, the signal amplification sub-circuit includes an instrumentation amplifier, and the instrumentation amplifier amplifies and outputs a difference value between the first voltage signal and the second voltage signal.
According to still another aspect of the present disclosure, there is provided a battery management system including: the battery safety detecting device according to any one of the above.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the disclosure and together with the description serve to explain the principles of the disclosure.
Fig. 1 is a schematic structural view of a battery device provided with a battery safety detection device according to an embodiment of the present disclosure.
Fig. 2 is a schematic structural view of a battery device provided with a battery safety detection device according to still another embodiment of the present disclosure.
Fig. 3 is a schematic structural view of a strain sensing part of a battery safety detection device according to an embodiment of the present disclosure.
Fig. 4 is a schematic structural view of a strain sensing device of a strain sensing part of a battery safety detection apparatus according to an embodiment of the present disclosure.
Fig. 5 is a schematic structural view of a strain sensing part of a battery safety detection device according to still another embodiment of the present disclosure.
Fig. 6 is one of schematic diagrams of a manner in which a mutual capacitor can be formed between conductive elements of a strain sensing device of a strain sensing part of a battery safety detection apparatus according to an embodiment of the present disclosure.
Fig. 7 is a schematic structural view of a strain sensing part of a battery safety detection device according to still another embodiment of the present disclosure.
Fig. 8 is a schematic structural view of one of the strain sensitive devices of the strain sensitive part of the battery safety detection apparatus according to still another embodiment of the present disclosure.
Fig. 9 is a schematic structural view of a second strain sensing device of the strain sensing part of the battery safety detection apparatus according to still another embodiment of the present disclosure.
Fig. 10 is a schematic structural view of a strain sensing device of a strain sensing part of a battery safety detection apparatus according to still another embodiment of the present disclosure.
Fig. 11 is a schematic diagram of a first sub-array of the strain sensitive devices shown in fig. 10.
Fig. 12 is a schematic diagram of a second sub-array of the strain sensitive devices shown in fig. 10.
Fig. 13 is a schematic structural view of a strain sensing device of a strain sensing part of a battery safety detection apparatus according to still another embodiment of the present disclosure.
Fig. 14 is a schematic configuration diagram of a drive detection unit of the battery safety detection device according to the embodiment of the present disclosure.
Fig. 15 is a schematic configuration diagram of a detection circuit of a drive detection unit of the battery safety detection device according to the embodiment of the present disclosure.
Fig. 16 is a schematic configuration diagram of a charge-signal conversion sub-circuit of a detection circuit of a drive detection unit of the battery safety detection device according to one embodiment of the present disclosure.
Fig. 17 is a schematic configuration diagram of a charge signal conversion sub-circuit of a detection circuit of a drive detection portion of a battery safety detection device according to still another embodiment of the present disclosure.
Fig. 18 is a schematic configuration diagram of a detection circuit of a drive detection unit of the battery safety detection device according to the embodiment of the present disclosure.
Fig. 19 is a schematic configuration diagram of a charge signal conversion sub-circuit of a detection circuit of a drive detection portion of a battery safety detection device according to still another embodiment of the present disclosure.
Fig. 20 is a schematic configuration diagram of a charge signal conversion sub-circuit of a detection circuit of a drive detection portion of a battery safety detection device according to still another embodiment of the present disclosure.
Fig. 21 is a schematic configuration diagram of a charge signal conversion sub-circuit of a detection circuit of a drive detection portion of a battery safety detection device according to still another embodiment of the present disclosure.
Fig. 22 is a timing chart of the clock signal (ck) and the output (D) of the comparator in fig. 21.
Fig. 23 is a schematic configuration diagram of a detection circuit of a drive detection unit of a battery safety detection device according to still another embodiment of the present disclosure.
Fig. 24 is a schematic configuration diagram of a detection circuit of a drive detection unit of a battery safety detection device according to still another embodiment of the present disclosure.
Fig. 25 is a schematic configuration diagram of a detection circuit of a drive detection unit of a battery safety detection device according to still another embodiment of the present disclosure.
Fig. 26 is a schematic diagram of a battery management system according to one embodiment of the present disclosure.
Detailed Description
The present disclosure will be described in further detail with reference to the drawings and embodiments. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limitations of the present disclosure. It should be further noted that, for the convenience of description, only the portions relevant to the present disclosure are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict. Technical solutions of the present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Unless otherwise indicated, the illustrated exemplary embodiments/examples are to be understood as providing exemplary features of various details of some ways in which the technical concepts of the present disclosure may be practiced. Accordingly, unless otherwise indicated, features of the various embodiments may be additionally combined, separated, interchanged, and/or rearranged without departing from the technical concept of the present disclosure.
The use of cross-hatching and/or shading in the drawings is generally used to clarify the boundaries between adjacent components. As such, unless otherwise noted, the presence or absence of cross-hatching or shading does not convey or indicate any preference or requirement for a particular material, material property, size, proportion, commonality between the illustrated components and/or any other characteristic, attribute, property, etc., of a component. Further, in the drawings, the size and relative sizes of components may be exaggerated for clarity and/or descriptive purposes. While example embodiments may be practiced differently, the specific process sequence may be performed in a different order than that described. For example, two processes described consecutively may be performed substantially simultaneously or in reverse order to that described. In addition, like reference numerals denote like parts.
When an element is referred to as being "on" or "on," "connected to" or "coupled to" another element, it can be directly on, connected or coupled to the other element or intervening elements may be present. However, when an element is referred to as being "directly on," "directly connected to" or "directly coupled to" another element, there are no intervening elements present. For purposes of this disclosure, the term "connected" may refer to physically, electrically, etc., and may or may not have intermediate components.
For descriptive purposes, the present disclosure may use spatially relative terms such as "below … …," below … …, "" below … …, "" below, "" above … …, "" above, "" … …, "" higher, "and" side (e.g., as in "side wall") to describe one component's relationship to another (other) component as illustrated in the figures. Spatially relative terms are intended to encompass different orientations of the device in use, operation, and/or manufacture in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below … …" can encompass both an orientation of "above" and "below". Further, the devices may be otherwise positioned (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
The terminology used herein is for the purpose of describing particular embodiments and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Furthermore, when the terms "comprises" and/or "comprising" and variations thereof are used in this specification, the presence of stated features, integers, steps, operations, elements, components and/or groups thereof are stated but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and/or groups thereof. It is also noted that, as used herein, the terms "substantially," "about," and other similar terms are used as approximate terms and not as degree terms, and as such, are used to interpret inherent deviations in measured values, calculated values, and/or provided values that would be recognized by one of ordinary skill in the art.
The present disclosure provides a battery safety detection device, wherein the battery safety detection device can be used for detecting the deformation of a battery at least, wherein the deformation can be a battery bulge type deformation, and also can be a deformation formed after the battery is extruded from the outside. The cause of the external compression may include, for example, a collision or acceleration, etc.
Fig. 1 is a schematic structural view of a battery device provided with a battery safety detection device according to an embodiment of the present disclosure. Fig. 2 is a schematic structural view of a battery device provided with a battery safety detection device according to still another embodiment of the present disclosure. Fig. 3 is a schematic structural view of a strain sensing part of a battery safety detection device according to an embodiment of the present disclosure. Fig. 4 is a schematic structural view of a strain sensing device of a strain sensing part of a battery safety detection apparatus according to an embodiment of the present disclosure. Fig. 5 is a schematic structural view of a strain sensing part of a battery safety detection device according to still another embodiment of the present disclosure. Fig. 6 is one of schematic diagrams of a manner in which a mutual capacitor can be formed between conductive elements of a strain sensing device of a strain sensing part of a battery safety detection apparatus according to an embodiment of the present disclosure. Fig. 7 is a schematic structural view of a strain sensing part of a battery safety detection device according to still another embodiment of the present disclosure. Fig. 8 is a schematic structural view of one of the strain sensitive devices of the strain sensitive part of the battery safety detection apparatus according to still another embodiment of the present disclosure. Fig. 9 is a schematic structural view of a second strain sensing device of the strain sensing part of the battery safety detection apparatus according to still another embodiment of the present disclosure. Fig. 10 is a schematic structural view of a strain sensing device of a strain sensing part of a battery safety detection apparatus according to still another embodiment of the present disclosure. Fig. 11 is a schematic diagram of a first sub-array of the strain sensitive devices shown in fig. 10. Fig. 12 is a schematic diagram of a second sub-array of the strain sensitive devices shown in fig. 10. Fig. 13 is a schematic structural view of a strain sensing device of a strain sensing part of a battery safety detection apparatus according to still another embodiment of the present disclosure. Fig. 14 is a schematic configuration diagram of a drive detection unit of the battery safety detection device according to the embodiment of the present disclosure. Fig. 15 is a schematic configuration diagram of a detection circuit of a drive detection unit of the battery safety detection device according to the embodiment of the present disclosure. Fig. 16 is a schematic configuration diagram of a charge-signal conversion sub-circuit of a detection circuit of a drive detection unit of the battery safety detection device according to one embodiment of the present disclosure. Fig. 17 is a schematic configuration diagram of a charge signal conversion sub-circuit of a detection circuit of a drive detection portion of a battery safety detection device according to still another embodiment of the present disclosure. Fig. 18 is a schematic configuration diagram of a detection circuit of a drive detection unit of the battery safety detection device according to the embodiment of the present disclosure. Fig. 19 is a schematic configuration diagram of a charge signal conversion sub-circuit of a detection circuit of a drive detection portion of a battery safety detection device according to still another embodiment of the present disclosure. Fig. 20 is a schematic configuration diagram of a charge signal conversion sub-circuit of a detection circuit of a drive detection portion of a battery safety detection device according to still another embodiment of the present disclosure. Fig. 21 is a schematic configuration diagram of a charge signal conversion sub-circuit of a detection circuit of a drive detection portion of a battery safety detection device according to still another embodiment of the present disclosure. Fig. 22 is a timing chart of the clock signal (ck) and the output (D) of the comparator in fig. 21. Fig. 23 is a schematic configuration diagram of a detection circuit of a drive detection unit of a battery safety detection device according to still another embodiment of the present disclosure. Fig. 24 is a schematic configuration diagram of a detection circuit of a drive detection unit of a battery safety detection device according to still another embodiment of the present disclosure. Fig. 25 is a schematic configuration diagram of a detection circuit of a drive detection unit of a battery safety detection device according to still another embodiment of the present disclosure. Fig. 26 is a schematic diagram of a battery management system according to one embodiment of the present disclosure.
The battery safety detection device and the battery management system according to the present disclosure will be described in detail with reference to fig. 1 to 26.
According to an embodiment of the present disclosure, a battery safety detecting apparatus includes:
at least one strain sensing part 12, the at least one strain sensing part 12 being arranged on at least one surface of the battery 11 of the battery device 10, the strain sensing part 12 being capable of generating a strain electrical signal at least based on a deformation of the battery 11 of the battery device 10, the strain electrical signal being indicative of at least an occurrence of the deformation;
wherein the strain sensing part 12 comprises at least one strain sensing device 121, the strain sensing device 121 comprises a plurality of conductive elements 1211, the plurality of conductive elements 1211 are uniformly arranged into a two-dimensional array, and each conductive element 1211 is insulated from other conductive elements 1211; the strain sensing device 121 is capable of deforming a position of the two-dimensional array corresponding to the deformation of the battery in response to the deformation of the battery, and the strain sensing part 12 generates a strain electric signal based on the deformation of the two-dimensional array.
The conductive element 1211 may be a sheet-like conductive thin film such as ITO (indium tin oxide).
As shown in fig. 1, the battery device 10 may include only one battery 11, and the battery 11 may be a battery pack including a plurality of battery cells or a battery cell. As can be seen from fig. 2, the battery device 10 includes a plurality of batteries 11, fig. 2 exemplarily shows four batteries 11, and the batteries 11 may be a battery pack including a plurality of battery cells or may be battery cells.
The battery safety detecting apparatus shown in fig. 1 has four strain sensing parts 12, and the four strain sensing parts 12 are respectively disposed between four side surfaces of the battery 11 and the case 15. The strain sensitive portion 12 may be provided between the top surface of the battery 11 and the case 15, or between the bottom surface of the battery 11 and the case 15.
In the battery device 10 shown in fig. 2, the strain sensitive portions 12 are provided between the batteries 11, and the strain sensitive portions 12 are also provided between the side surfaces of the batteries 11 and the case 15.
It will be understood by those skilled in the art that the number of the batteries 11 and the arrangement position of the strain sensitive portions 12 shown in fig. 1 and 2 are exemplary.
With the battery safety detecting apparatus of the above embodiment, the strain electric signal includes a self-capacitance change signal of any one of the conductive elements 1211 of the two-dimensional array.
With the battery safety detection device of the above embodiment, the strain electric signal includes a mutual capacitance change signal between two adjacent conductive elements 1211 of the two-dimensional array.
According to the battery safety detecting apparatus according to one embodiment of the present disclosure, as shown in fig. 4, the two-dimensional array includes a plurality of conductive elements 1211 arranged in a first direction and a plurality of conductive elements 1211 arranged in a second direction, the first direction being perpendicular to the second direction.
In the above embodiment, the two adjacent conductive elements 1211 are two conductive elements adjacent in the first direction or two conductive elements adjacent in the second direction, and the first direction is perpendicular to the second direction.
According to the battery safety detecting apparatus of the alternative preferred embodiment of the present disclosure, the strain electric signal includes a mutual capacitance change signal between any two non-adjacent conductive elements 1211 of the two-dimensional array.
The strain sensitive part 12 shown in fig. 3 has only one strain sensitive device 121, and the strain sensitive part 12 shown in fig. 5 has two strain sensitive devices 121.
As shown in fig. 5, the strain sensing part 12 includes two strain sensing devices 121, the two strain sensing devices 121 are oppositely disposed, and an insulation gap is disposed between the two strain sensing devices 121.
The insulation gap may be realized by a flexible insulating substance, and the insulation gap may also be air or vacuum.
With the battery safety detecting apparatus of each of the above embodiments, it is preferable that the driving electric signals are simultaneously applied to all the conductive elements 1211 of the strain sensing device 121, and the self-capacitances of the respective conductive elements 1211 are simultaneously measured, and the self-capacitance change signal is generated if the self-capacitances of the conductive elements 1211 change.
With the battery safety detecting apparatus of each of the above embodiments, it is preferable that the driving electric signal is sequentially applied to each of the conductive elements 1211 of all the conductive elements 1211 of the strain sensing device 121, and the self-capacitance of each of the conductive elements 1211 is sequentially measured, and the self-capacitance change signal is generated if the self-capacitance of the conductive element 1211 changes.
In each of the above embodiments, the degree of deformation is determined based on the magnitude of the self-capacitance change signal, and the position of deformation is determined based on the position of the conductive element 1211, whose self-capacitance has changed, in the two-dimensional array.
With the battery safety detection apparatus of each of the above embodiments, it is preferable that, as shown in fig. 4, for the two-dimensional array of the conductive elements 1211 arranged in the first direction (the illustrated horizontal direction), divided into a plurality of groups in the second direction, the following operations are simultaneously performed for each group of the conductive elements 1211 of the plurality of groups of the conductive elements 1211:
a driving electric signal is sequentially applied to a mutual capacitor constituted by two adjacent conductive elements 1211, and a mutual capacitance is measured, and a mutual capacitance change signal is generated if the mutual capacitance changes.
With the battery safety detection apparatus of each of the above embodiments, it is preferable that, as shown in fig. 4, for the two-dimensional array of the conductive elements 1211 arranged in the first direction (the illustrated horizontal direction), divided into a plurality of groups in the second direction, the following operations are sequentially performed for each group of conductive elements 1211 of the plurality of groups of conductive elements 1211:
a driving electric signal is sequentially applied to a mutual capacitor constituted by two adjacent conductive elements 1211, and a mutual capacitance is measured, and a mutual capacitance change signal is generated if the mutual capacitance changes.
With the battery safety detection apparatus of each of the above embodiments, it is preferable that, as shown in fig. 4, for the two-dimensional array of the conductive elements 1211 arranged in the second direction (the illustrated vertical direction), divided into a plurality of groups in the first direction, the following operations are simultaneously performed for each group of the conductive elements 1211 of the plurality of groups of the conductive elements 1211:
a driving electric signal is sequentially applied to a mutual capacitor constituted by two adjacent conductive elements 1211, and a mutual capacitance is measured, and a mutual capacitance change signal is generated if the mutual capacitance changes.
With the battery safety detection apparatus of each of the above embodiments, it is preferable that, as shown in fig. 4, for the two-dimensional array of the conductive elements 1211 arranged in the second direction (the illustrated vertical direction), divided into a plurality of groups in the first direction, the following operations are sequentially performed for each group of conductive elements 1211 of the plurality of groups of conductive elements 1211:
a driving electric signal is sequentially applied to a mutual capacitor constituted by two adjacent conductive elements 1211, and a mutual capacitance is measured, and a mutual capacitance change signal is generated if the mutual capacitance changes.
With the battery safety detection apparatus of each of the above embodiments, it is preferable that, as shown in fig. 4, for the two-dimensional array of the conductive elements 1211 arranged in the first direction (the illustrated horizontal direction), divided into a plurality of groups in the second direction, the following operations are simultaneously performed for each group of the conductive elements 1211 of the plurality of groups of the conductive elements 1211:
a driving electric signal is sequentially applied to a mutual capacitor formed of two conductive elements 1211 having a predetermined conductive element interval, and a mutual capacitance is measured, and a mutual capacitance change signal is generated if the mutual capacitance changes.
With the battery safety detection apparatus of each of the above embodiments, it is preferable that, as shown in fig. 4, for the two-dimensional array of the conductive elements 1211 arranged in the second direction (the illustrated vertical direction), divided into a plurality of groups in the first direction, the following operations are simultaneously performed for each group of the conductive elements 1211 of the plurality of groups of the conductive elements 1211:
a driving electric signal is sequentially applied to a mutual capacitor formed of two conductive elements 1211 having a predetermined conductive element interval, and a mutual capacitance is measured, and a mutual capacitance change signal is generated if the mutual capacitance changes.
With the battery safety detection apparatus of each of the above embodiments, it is preferable that, as shown in fig. 4, for the two-dimensional array of the conductive elements 1211 arranged in the first direction (the illustrated horizontal direction), divided into a plurality of groups in the second direction, the following operations are sequentially performed for each group of conductive elements 1211 of the plurality of groups of conductive elements 1211:
a driving electric signal is sequentially applied to a mutual capacitor formed of two conductive elements 1211 having a predetermined conductive element interval, and a mutual capacitance is measured, and a mutual capacitance change signal is generated if the mutual capacitance changes.
With the battery safety detection apparatus of each of the above embodiments, it is preferable that, as shown in fig. 4, for the two-dimensional array of the conductive elements 1211 arranged in the second direction (the illustrated vertical direction), divided into a plurality of groups in the first direction, the following operations are sequentially performed for each group of conductive elements 1211 of the plurality of groups of conductive elements 1211:
a driving electric signal is sequentially applied to a mutual capacitor formed of two conductive elements 1211 having a predetermined conductive element interval, and a mutual capacitance is measured, and a mutual capacitance change signal is generated if the mutual capacitance changes.
Fig. 7 is a schematic structural view of a strain sensing part of a battery safety detection device according to still another embodiment of the present disclosure. Fig. 8 is a schematic structural view of one of the strain sensitive devices of the strain sensitive part of the battery safety detection apparatus according to still another embodiment of the present disclosure. Fig. 9 is a schematic structural view of a second strain sensing device of the strain sensing part of the battery safety detection apparatus according to still another embodiment of the present disclosure.
As shown in fig. 7 to 9, the strain sensing part of the battery safety detecting apparatus includes a first strain sensing device 121 and a second strain sensing device 122, the conductive elements are conductive strips, the first strain sensing device 121 includes a plurality of first conductive strips 1211 arranged along a first direction (shown in a horizontal direction), the second strain sensing device 122 includes a plurality of second conductive strips 1221 arranged along a second direction (shown in a vertical direction), two adjacent first conductive strips 1211 are insulated from each other, two adjacent second conductive strips 1221 are insulated from each other, and the first direction is perpendicular to the second direction.
Wherein the strain electric signal comprises a mutual capacitance variation signal between each first conductive strip 1211 of the first strain sensing device 121 and each second conductive strip 1221 of the second strain sensing device 122.
As shown in fig. 5, according to still another embodiment of the present disclosure, the strain sensing part 12 includes a first strain sensing device including a first rectangular conductive element array with insulation between respective first conductive elements of the first rectangular conductive element array, and a second strain sensing device including a second rectangular conductive element array with insulation between respective second conductive elements of the second rectangular conductive element array, with respective first conductive elements of the first rectangular conductive element array being disposed opposite to respective second conductive elements of the second rectangular conductive element array.
The strain electric signal comprises a mutual capacitance change signal between the first conductive element and the second conductive element which are arranged oppositely of the first rectangular conductive element array and the second rectangular conductive element array.
Fig. 7 to 9 show schematic structural views of a strain sensing device 121 according to still another embodiment of the present disclosure.
As shown in fig. 7 to 9, the two-dimensional array of the strain sensing devices 121 of the strain sensing section 12 of the battery safety detection apparatus includes a first sub-array (V1, V2, V3, V4) and a second sub-array (H1, H2, H3, H4), the first sub-array and the second sub-array being disposed within the same planar region;
the first sub-array comprises a plurality of first series groups of conductive elements (V1, V2, V3, V4), the first series groups of conductive elements comprising a plurality of conductive elements connected in series along a first direction, the plurality of first series groups of conductive elements being aligned along a second direction; the first series conductive element groups are insulated;
the second sub-array comprising a plurality of second groups of series-connected conductive elements (H1, H2, H3, H4), the second groups of series-connected conductive elements comprising a plurality of conductive elements connected in series along the second direction, the plurality of second groups of series-connected conductive elements being arranged along the first direction; the second series connection conductive element groups are insulated;
the first subarray and the second subarray are insulated;
the first direction and the second direction are perpendicular to each other.
It will be understood by those skilled in the art that the strain sensing device 121 shown in fig. 3 and 5 may be the strain sensing device 121 shown in fig. 7 to 9.
It will be understood by those skilled in the art that the number of first series groups of conductive elements of the first sub-array and the number of second series groups of conductive elements of the second sub-array shown in fig. 7-9 are merely exemplary.
In the battery safety detection device according to the present embodiment, the shape of the conductive elements of the first sub-array is the same as the shape of the conductive elements of the second sub-array.
The conductive elements may take the shape of a diamond as in fig. 7 to 9, or may take other shapes, the shape of the conductive elements shown in fig. 7 to 9 being only a preferred shape.
With the battery safety detection apparatus of the above-described embodiment, it is preferable that the driving electric signal is simultaneously applied to all the first series conductive element groups of the first sub-array and all the second series conductive element groups of the second sub-array, the self-capacitances of all the first series conductive element groups of the first sub-array and all the second series conductive element groups of the second sub-array are simultaneously measured, and the self-capacitance change signal is generated if the self-capacitances change.
With the battery safety detection apparatus of the above-described embodiment, it is preferable that the deformation position of the two-dimensional array is determined based on the position information of the first series conductive element group in the first sub-array in which at least one self-capacitance of the first sub-array changes and the position information of the second series conductive element group in the second sub-array in which at least one self-capacitance of the second sub-array changes.
With the battery safety detection apparatus of the above-described embodiment, it is preferable that the driving electric signals are simultaneously applied to all the first series conductive element groups of the first sub-array and all the second series conductive element groups of the second sub-array, and the mutual capacitances of the respective mutual capacitors formed by the respective first series conductive element groups of the first sub-array and the respective second series conductive element groups of the second sub-array are simultaneously measured, and the mutual capacitance change signal is generated if the mutual capacitances are changed.
With the battery safety detection apparatus of the above-described embodiment, it is preferable that the deformation position of the two-dimensional array is determined based on the positional information of the first series conductive element group in the first sub-array and the positional information of the second series conductive element group in the second sub-array of the mutual capacitor in which the mutual capacitance changes.
For the battery safety detection apparatus of each of the above embodiments, as shown in fig. 3 and 5, the strain sensing part 12 further includes a first substrate layer 125 and a second substrate layer 126, and the strain sensing device 121 is disposed between the first substrate layer 125 and the second substrate layer 126 and is held by the first substrate layer 125 and the second substrate layer 126.
First substrate layer 125 and second substrate layer 126 are preferably both insulating materials.
Preferably, first substrate layer 125 and second substrate layer 126 are both flexible substrates.
Preferably, two strain sensitive devices 121 are disposed on first substrate layer 125 and second substrate layer 126, respectively.
According to the battery safety check device of the preferred embodiment of the present disclosure, the strain sensing part 12 further includes a support part 124, and the support part 124 is disposed between the first substrate layer 125 and the second substrate layer 126.
Preferably, support 124 is disposed at an edge of first substrate layer 125 and second substrate layer 126.
Wherein the supporting portion 124 includes a plurality of discrete supporting portions, or the supporting portion 124 is a unitary structure.
The strain sensing part 12 of the battery safety detection apparatus of each of the above embodiments can be disposed between two adjacent batteries 11.
The strain sensitive portion 12 of the battery safety detection device according to each of the above embodiments may be provided between the battery 11 and the case 15, and the strain sensitive portion 12 may generate a strain electric signal based on a deformation of the case 15 of the battery device 10.
In the battery safety detecting device according to each of the above embodiments, as shown in fig. 11, the battery safety detecting device preferably further includes a drive detecting unit 13, and the drive detecting unit 13 applies a drive electric signal to the strain sensitive unit 12 and detects a strain electric signal generated by the strain sensitive unit 12.
Preferably, the drive detection section 13 includes:
a drive circuit for supplying a drive electric signal to the strain sensing part 12; the detection circuit is used for detecting the power transformation signal; and a controller for controlling the driving circuit to supply a driving signal to the strain sensing part 12 and processing the strain electric signal obtained by the detection circuit to generate a processed strain electric signal.
Preferably, the driving detection unit 13 further includes a memory for storing the strain electric signal processed by the controller.
The detection circuit 132 of the battery safety detection apparatus of the present disclosure is described in detail below with reference to fig. 15 to 25.
According to the battery safety detecting apparatus of one embodiment of the present disclosure, the detecting circuit 132 includes a capacitance detecting circuit that detects a self-capacitance change signal of each conductive element and/or a mutual capacitance change signal between two conductive elements.
According to one embodiment of the present disclosure, a capacitance detection circuit includes a charge signal conversion sub-circuit that converts self-capacitance accumulated charges of respective conductive elements into a voltage signal and/or converts mutual capacitance accumulated charges between two conductive elements into a voltage signal.
The capacitance detection circuit of the battery safety detection device of the above embodiment further includes a signal post-processing circuit, where the signal post-processing circuit performs post-processing on the voltage signal output by the charge signal conversion sub-circuit, and the post-processing includes filtering processing and analog-to-digital conversion processing.
According to the battery safety detecting apparatus of one embodiment of the present disclosure,as shown in FIGS. 16 to 18, the charge signal conversion sub-circuit includes a first amplifier, a drive signal (V)Stim) Is applied to either the self-capacitance (Cx) or the mutual capacitance (Cx); the first amplifier converts the accumulated charge from the capacitance or the mutual capacitance into a voltage signal Vout 1.
It will be appreciated by those skilled in the art that the specific structure of the first amplifier in fig. 16-18 is the preferred structure of the present disclosure, and those skilled in the art can make appropriate adjustments to the specific structure of the first amplifier in light of the present disclosure.
As shown in fig. 18, according to one embodiment of the present disclosure, the signal post-processing circuit further includes a demodulator 325, an oscillator 326, an accumulator 327, and a register 328.
It should be understood by those skilled in the art that the specific structure of the signal post-processing circuit in fig. 18 is merely exemplary.
According to yet another embodiment of the present disclosure, the capacitance detection circuit includes a charge signal conversion sub-circuit that converts self-capacitance accumulated charges of respective conductive elements into a frequency signal and/or converts mutual capacitance accumulated charges between two conductive elements into a frequency signal.
As shown in fig. 19, preferably, the charge signal conversion sub-circuit includes a constant current source (I)b) The constant current source is controlled to charge or discharge a self-capacitance (Cx) or a mutual capacitance (Cx), triangular waveform voltage signals generated by the charging and discharging of the self-capacitance or the mutual capacitance are respectively input to the first comparator and the second comparator, the first comparator has a first threshold voltage (Vth1), the second comparator has a second threshold voltage (Vth2), the triangular waveform voltage signals are converted into square wave electric signals by the first comparator and the second comparator, the amplitude of the square wave electric signals is adjusted by the multiplexer, and the frequency of the square wave electric signals output by the multiplexer is a function of the charging and discharging currents of the self-capacitance or the mutual capacitance. Based on this, a capacitance change signal of a self capacitance or a mutual capacitance may be generated.
According to yet another embodiment of the present disclosure, the capacitance detection circuit includes a charge signal conversion sub-circuit that converts self-capacitance accumulated charges of respective conductive elements into a pulse width signal and/or converts mutual capacitance accumulated charges between two conductive elements into a pulse width signal.
As shown in fig. 20, preferably, the charge signal conversion sub-circuit includes a constant current source (I)b) The constant current source is controlled to charge or discharge a self-capacitance (Cx) or a mutual capacitance (Cx), the self-capacitance or the mutual capacitance is connected with the input end and the output end of the transconductance amplifier in a bridging mode, the output of the transconductance amplifier is a triangular waveform voltage signal, the comparator compares the triangular waveform voltage signal with a threshold voltage signal, and when the triangular waveform voltage signal is larger than the threshold voltage signal, the comparator outputs a high level.
According to yet another embodiment of the present disclosure, the capacitance detection circuit includes a charge signal conversion sub-circuit that converts self-capacitance accumulated charges of the respective conductive elements into digital signals and/or converts mutual capacitance accumulated charges between two conductive elements into digital signals.
Preferably, the charge signal conversion sub-circuit includes an integrator and a comparator, the integrator being controlled to accumulate and convert accumulated charges of the mutual capacitance or the self capacitance into the voltage signal, and the integrator being controlled to accumulate and convert accumulated charges of a capacitance difference of the self capacitance or the mutual capacitance and the reference capacitance into the voltage signal, the comparator outputting a high level or a low level based on the positive or negative of the voltage signal.
Preferably, as shown in fig. 21 to 22, there is C in its feedback loopintThe amplifier of (a) is used as an integrator. The output voltage of the integrator is assumed to be negative at the start of the measurement. Therefore, the output of the comparator (D) is zero, and as shown in FIGS. 21 and 22, when D is zero, both control signals φ 1, φ 2 are low. When the clock CK is high, CxFrom VrefCharging, in the second phase (CK is low), with a charge quantity VrefCxIs transferred to an integrating capacitor Cint. As long as the output V of the integratorrefCx/CintNegative, the comparator output is zero. When the output of the integratorGo out VrefCx/CintIs positive, the quantity of electric charge (C)x-Cref)VrefIs transferred to an integrating capacitor Cint. Therefore, in the first period (when D is 1), (C)x-Cref)Vref/CintIs applied to the output of the integrator, and during a second time period (when D is 0), VrefCx/CintApplied to the output of the integrator, the ratio of the first time period to the sum of the first time period and the second time period being equal to CxAnd CrefThe ratio of (a) to (b).
According to a battery safety detecting apparatus according to still another embodiment of the present disclosure, the capacitance detecting circuit includes a charge signal converting sub-circuit that converts self-capacitance accumulated charges of the respective conductive elements into a voltage signal and/or converts mutual capacitance accumulated charges between two conductive elements into a voltage signal, and a signal amplifying sub-circuit that amplifies the voltage signal to generate an amplified voltage signal.
As shown in fig. 23, the capacitance detection circuit preferably further includes a signal post-processing sub-circuit including at least a filter and an analog-to-digital converter.
According to still another embodiment of the present disclosure, as shown in fig. 24, the charge signal conversion sub-circuit includes a reference capacitance (C)ref) A first amplifier (OP1) and a second amplifier (OP2), the first amplifier will be self-capacitance (C)x) Or mutual capacitance (C)x) Converts the accumulated charge into a first voltage signal, and a second amplifier converts a reference capacitance (C)ref) The accumulated charge of (a) is converted into a second voltage signal.
Preferably, in the above-described embodiment, as shown in fig. 24, the signal amplification sub-circuit includes a common mode amplifier (CM1), and the common mode amplifier amplifies a difference between the first voltage signal and the second voltage signal and outputs the amplified difference.
According to still another embodiment of the present disclosure, as shown in fig. 25, the charge signal conversion sub-circuit includes a reference capacitance (C)ref) First amplifier, second amplifier and rectifier&A filter, a first amplifierSelf-capacitance (C)x) Or mutual capacitance (C)x) Converts the accumulated charge into a first voltage signal, and a second amplifier converts a reference capacitance (C)ref) Is converted into a second voltage signal, rectified&The filter rectifies and filters the first voltage signal and the second voltage signal respectively and then outputs the rectified and filtered signals.
Preferably, as shown in fig. 25, the signal amplification sub-circuit includes an instrumentation amplifier, and the instrumentation amplifier amplifies and outputs a difference value between the first voltage signal and the second voltage signal.
The present disclosure also provides a battery management system including the battery safety detection apparatus of any one of the above embodiments. Fig. 26 shows the battery management system in which the drive detection section 13 described above may be integrated into a chip, and the pin strain sensing section of the chip is connected.
In the description herein, reference to the description of the terms "one embodiment/mode," "some embodiments/modes," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/mode or example is included in at least one embodiment/mode or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to be the same embodiment/mode or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/aspects or examples and features of the various embodiments/aspects or examples described in this specification can be combined and combined by one skilled in the art without conflicting therewith.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
It will be understood by those skilled in the art that the foregoing embodiments are merely for clarity of illustration of the disclosure and are not intended to limit the scope of the disclosure. Other variations or modifications may occur to those skilled in the art, based on the foregoing disclosure, and are still within the scope of the present disclosure.

Claims (10)

1. A battery safety detecting device, comprising:
at least one strain sensing portion disposed on at least one surface of a battery device, the strain sensing portion capable of generating a strain electrical signal based at least on a deformation of the battery device, the strain electrical signal being indicative of at least an occurrence of the deformation;
the strain sensing part comprises at least one strain sensing device, the strain sensing device comprises a plurality of conductive elements, the conductive elements are uniformly arranged into a two-dimensional array, and each conductive element is insulated from other conductive elements; the strain sensing device can respond to deformation of a battery to enable the position, corresponding to the deformation of the battery, of the two-dimensional array to deform, and the strain sensing portion generates the strain electric signal based on the deformation of the two-dimensional array.
2. The battery safety detection device according to claim 1, wherein the strain electrical signal comprises a self-capacitance change signal of any one of the conductive elements of the two-dimensional array.
3. The battery safety detection device according to claim 1, wherein the strain electrical signal comprises a mutual capacitance change signal between two adjacent conductive elements of the two-dimensional array.
4. The battery safety detection device according to claim 1, wherein the two-dimensional array comprises a plurality of conductive elements arranged in a first direction and a plurality of conductive elements arranged in a second direction, the first direction being perpendicular to the second direction.
5. The battery safety detection device according to claim 3, wherein the two adjacent conductive elements are two conductive elements adjacent in a first direction or two conductive elements adjacent in a second direction, and the first direction is perpendicular to the second direction.
6. The battery safety detection device according to claim 1, wherein the strain electrical signal comprises a mutual capacitance change signal between any two non-adjacent conductive elements of the two-dimensional array.
7. The battery safety detection device according to any one of claims 1 to 6, further comprising a drive detection portion that applies a drive electric signal to the strain sensing portion and detects the strain electric signal generated by the strain sensing portion.
8. The battery safety detection device according to claim 7, wherein the drive detection portion includes:
a driving circuit for providing a driving electric signal to the strain sensing part;
a detection circuit for detecting the strain electrical signal; and
and the controller controls the driving circuit to provide a driving signal for the strain sensing part, processes the strain electric signal obtained by the detection circuit and generates a processed strain electric signal.
9. The battery safety detection device according to claim 8, wherein the detection circuit comprises a capacitance detection circuit that detects a self-capacitance change signal of each conductive element and/or a mutual capacitance change signal between two conductive elements.
10. A battery management system, comprising: the battery safety detection device according to any one of claims 1 to 9.
CN202110205120.5A 2021-02-24 2021-02-24 Battery safety detection device and battery management system Pending CN112857199A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114018148A (en) * 2021-09-30 2022-02-08 联想(北京)有限公司 Electronic equipment and battery safety detection method applied to same
WO2022174728A1 (en) * 2021-02-22 2022-08-25 珠海迈巨微电子有限责任公司 Battery deformation detection apparatus and battery management system
WO2023213022A1 (en) * 2022-05-05 2023-11-09 宁德时代新能源科技股份有限公司 Strain detection assembly, battery, and electric device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022174728A1 (en) * 2021-02-22 2022-08-25 珠海迈巨微电子有限责任公司 Battery deformation detection apparatus and battery management system
CN114018148A (en) * 2021-09-30 2022-02-08 联想(北京)有限公司 Electronic equipment and battery safety detection method applied to same
WO2023213022A1 (en) * 2022-05-05 2023-11-09 宁德时代新能源科技股份有限公司 Strain detection assembly, battery, and electric device

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