CN113188435A

CN113188435A - Battery safety detection device and battery management system

Info

Publication number: CN113188435A
Application number: CN202110506024.4A
Authority: CN
Inventors: 周号
Original assignee: Zhuhai Maiju Microelectronics Co Ltd
Current assignee: Zhuhai Maiju Microelectronics Co Ltd
Priority date: 2021-01-22
Filing date: 2021-05-10
Publication date: 2021-07-30
Also published as: CN112762813A

Abstract

The present disclosure provides a battery safety detection device, including: at least one sensing part is arranged on a battery of the battery device, and the sensing part can generate a signal. 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 first conducting layer and a second conducting layer, a preset interval is formed between the first conducting layer and the second conducting layer, the first conducting layer or the second conducting layer can respond to deformation of a battery to enable the preset interval between the position of the first conducting layer corresponding to the deformation and the position of the second conducting layer corresponding to the deformation to change, and the strain electric signal is generated based on the change of the preset interval.

According to the battery safety detection apparatus of at least one embodiment of the present disclosure, a first driving voltage is applied to both ends of the first conductive layer, current sensing is performed on both ends of the first conductive layer, and a change in the preset interval between the first conductive layer and the second conductive layer is determined based on a change in the sensed current;

or applying a second driving voltage to two ends of the second conductive layer, sensing current at the two ends of the second conductive layer, and judging the change of the preset distance between the first conductive layer and the second conductive layer based on the sensed current change;

or, applying a first driving voltage to both ends of the first conductive layer, performing current sensing on both ends of the first conductive layer, applying a second driving voltage to both ends of the second conductive layer, performing current sensing on both ends of the second conductive layer, and determining a change in the preset gap between the first conductive layer and the second conductive layer based on a change in current at both ends of the first conductive layer and a change in current at both ends of the second conductive layer;

the strain electrical signal includes a change in the current.

The battery safety detection device according to at least one embodiment of the present disclosure further includes a signal detection unit that detects the strain electric signal generated by the strain sensing unit.

According to the battery safety detection apparatus of at least one embodiment of the present disclosure, a first driving current is applied to both ends of the first conductive layer, voltage sensing is performed on both ends of the first conductive layer, and a change in the preset interval between the first conductive layer and the second conductive layer is determined based on a change in the sensed voltage;

or applying a second driving current to two ends of the second conductive layer, sensing a voltage at the two ends of the second conductive layer, and judging a change of the preset distance between the first conductive layer and the second conductive layer based on a change of the sensed voltage;

or, applying a first driving current to both ends of the first conductive layer, and performing voltage sensing on both ends of the first conductive layer, applying a second driving current to both ends of the second conductive layer, and performing voltage sensing on both ends of the second conductive layer, and determining a change in the preset gap between the first conductive layer and the second conductive layer based on a change in voltage of both ends of the first conductive layer and a change in voltage of both ends of the second conductive layer;

the strain electrical signal includes a change in the voltage.

The battery safety detection device according to at least one embodiment of the present disclosure further includes a signal detection unit that measures a mutual capacitance formed by the first conductive layer and the second conductive layer, and determines a change in the preset gap based on a change in the mutual capacitance; the strain electrical signal includes a change in the mutual capacitance.

According to the battery safety detection device of at least one embodiment of the present disclosure, a first driving voltage is applied to both ends of the first conductive layer, voltage sensing is performed on the second conductive layer, and whether the first conductive layer and the second conductive layer are in contact is determined based on whether a sensing voltage is generated.

According to the battery safety detection device of at least one embodiment of the present disclosure, a second driving voltage is applied to both ends of the second conductive layer, voltage sensing is performed on the first conductive layer, and whether the first conductive layer and the second conductive layer are in contact is determined based on whether a sensing voltage is generated.

According to the battery safety detecting apparatus of at least one embodiment of the present disclosure, a driving voltage is alternately applied to both ends of the first conductive layer and both ends of the second conductive layer, and when the driving voltage is applied to both ends of the first conductive layer, voltage sensing is performed on the second conductive layer, and when the driving voltage is applied to both ends of the second conductive layer, voltage sensing is performed on the first conductive layer;

and judging the contact position of the first conductive layer and the second conductive layer at least based on the sensing voltage generated when the first conductive layer is subjected to voltage sensing and the sensing voltage generated when the second conductive layer is subjected to voltage sensing.

According to the battery safety detection device of at least one embodiment of the present disclosure, both ends of the first conductive layer to which the driving voltage is applied are both ends in a first direction, and both ends of the second conductive layer to which the driving voltage is applied are both ends in a second direction, the first direction being perpendicular to the second direction.

According to the battery safety detection device of at least one embodiment of the present disclosure, the first conductive layer includes a plurality of first conductive strips arranged along a first direction, two adjacent first conductive strips are insulated from each other, the second conductive layer includes a plurality of second conductive strips arranged along a second direction, 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 device of at least one embodiment of the present disclosure, a second driving voltage is applied to both ends of all second conductive strips of the second conductive layer, voltage sensing is performed on all first conductive strips of the first conductive layer, whether the first conductive layer and the second conductive layer are in contact is determined based on whether a sensing voltage is generated, and a contact position of the first conductive layer and the second conductive layer is determined based on a position of at least one first conductive strip generating the sensing voltage in the first conductive layer.

According to the battery safety detection device of at least one embodiment of the present disclosure, a first driving voltage is applied to both ends of all first conductive strips of the first conductive layer, voltage sensing is performed on all second conductive strips of the second conductive layer, whether the first conductive layer and the second conductive layer are in contact is determined based on whether a sensing voltage is generated, and a contact position of the first conductive layer and the second conductive layer is determined based on a position of at least one second conductive strip generating the sensing voltage in the second conductive layer.

According to the battery safety detection apparatus of at least one embodiment of the present disclosure, a driving voltage is alternately applied to both ends of all first conductive strips of the first conductive layers and both ends of all second conductive strips of the second conductive layers;

when a driving voltage is applied to two ends of all the first conductive strips of the first conductive layer, performing voltage sensing on all the second conductive strips of the second conductive layer, and when the driving voltage is applied to two ends of all the second conductive strips of the second conductive layer, performing voltage sensing on all the first conductive strips of the first conductive layer;

at least one contact position of the first conductive layer with the second conductive layer is obtained based on at least the position of the at least one second conductive strip in the second conductive layer generating the sensing voltage and the position of the at least one first conductive strip in the first conductive layer generating the sensing voltage.

According to the battery safety detection device of at least one embodiment of this disclosure, still include signal detection portion, signal detection portion measures the mutual capacitance that forms between each first conducting strip and each second conducting strip, thereby judge the position that the preset interval of first conducting layer and second conducting layer changes thereby judges at least one deformation position of battery based on the change of at least one mutual capacitance.

According to the battery safety detection device of at least one embodiment of the present disclosure, the first conducting layer comprises a first rectangular conducting element array, each first conducting element of the first rectangular conducting element array is insulated from each other, the second conducting layer comprises a second rectangular conducting element array, each second conducting element of the second rectangular conducting element array is insulated from each other, and each first conducting element of the first rectangular conducting element array is arranged opposite to each second conducting element of the second rectangular conducting element array.

According to the battery safety detection apparatus of at least one embodiment of the present disclosure, the second driving voltage is applied to all the second conductive elements of the second conductive layer, and voltage sensing is performed on all the first conductive elements of the first conductive layer, whether the first conductive layer and the second conductive layer are in contact is determined based on whether the sensing voltage is generated, and the contact position of the first conductive layer and the second conductive layer is determined based on the position of at least one first conductive element generating the sensing voltage in the first conductive layer.

According to the battery safety detection apparatus of at least one embodiment of the present disclosure, a first driving voltage is applied to all first conductive elements of the first conductive layer, and voltage sensing is performed on all second conductive elements of the second conductive layer, whether the first conductive layer and the second conductive layer are in contact is determined based on whether a sensing voltage is generated, and a contact position of the first conductive layer and the second conductive layer is determined based on a position of at least one second conductive element generating the sensing voltage in the second conductive layer.

According to the battery safety detection apparatus of at least one embodiment of the present disclosure, a driving voltage is alternately applied to all first conductive elements of the first conductive layer and all second conductive elements of the second conductive layer;

performing voltage sensing on all second conductive elements of the second conductive layer when a driving voltage is applied to all first conductive elements of the first conductive layer, and performing voltage sensing on all first conductive elements of the first conductive layer when a driving voltage is applied to all second conductive elements of the second conductive layer;

at least one contact position of the first conductive layer with the second conductive layer is obtained based on at least a position of the at least one second conductive element generating the sensing voltage in the second conductive layer and a position of the at least one first conductive element generating the sensing voltage in the first conductive layer.

According to the battery safety detection device of at least one embodiment of the present disclosure, the battery safety detection device further includes a signal detection unit, the signal detection unit measures mutual capacitance formed by the first conductive element and the second conductive element, which are oppositely disposed in the first rectangular conductive element array and the second rectangular conductive element array, and determines a position where a preset distance between the first conductive layer and the second conductive layer changes based on a change of at least one mutual capacitance, thereby determining at least one deformation position of the battery.

According to the battery safety inspection device of at least one embodiment of the present disclosure, the first conductive layer is disposed on a first substrate, and the second conductive layer is disposed on a second substrate.

According to the battery safety detection device of at least one embodiment of the present disclosure, the first substrate and the second substrate are both insulating substrates.

According to the battery safety detection device of at least one embodiment of the present disclosure, the first substrate and the second substrate are both flexible substrates.

According to the battery safety detecting apparatus of at least one embodiment of the present disclosure, the preset interval is formed by a support portion disposed between the first conductive layer and the second conductive layer.

According to the battery safety detecting apparatus of at least one embodiment of the present disclosure, the preset interval is formed by a support portion disposed between the first substrate and the second substrate.

According to the battery safety detecting apparatus of at least one embodiment of the present disclosure, the support portion is disposed at an edge of the first conductive layer and the second conductive layer.

According to the battery safety detection apparatus of at least one embodiment of the present disclosure, the support portion is disposed at an edge of the first substrate and the second substrate.

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 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.

According to a battery safety detection device of at least one embodiment of the present disclosure, the signal detection part includes:

a driving circuit for providing a driving signal to the strain sensing part; a detection circuit for detecting the strain electrical signal; and

and the controller is used for controlling the driving circuit to provide a driving signal for the strain sensing part and processing the strain electric signal obtained by the detection circuit to generate a processed strain electric signal.

According to the battery safety detection device of at least one embodiment of the present disclosure, the signal detection unit further includes a memory that stores the strain electric signal processed by the controller.

According to the battery safety detection apparatus of at least one embodiment of the present disclosure, the driving circuit includes:

a digital-to-analog converter that converts a digital drive signal received from the controller to an analog drive signal;

an amplifier that amplifies the analog drive signal to generate an amplified drive signal; and

a multiplexer including a plurality of signal channels, the driving signal amplified by the amplifier being applied to the strain sensing part via one or more of the plurality of signal channels.

According to the battery safety detecting apparatus of at least one embodiment of the present disclosure, the driving signal amplified by the amplifier is applied to the first conductive strip or strips of the first conductive layer of the strain sensing part via one or more of the plurality of signal channels;

alternatively, the driving signal amplified by the amplifier is applied to a second conductive strip or a plurality of second conductive strips of the second conductive layer of the strain sensing part via one or more of the plurality of signal channels.

a multiplexer comprising a plurality of signal channels, the analog drive signal being output via one or more of the plurality of signal channels; and

a plurality of amplifiers each of which amplifies an analog driving signal output via one signal channel of the multiplexer, the amplified analog driving signal being applied to the strain sensing part.

According to the battery safety detection device of at least one embodiment of the present disclosure, the analog driving signal output by one or more signal channels of the plurality of signal channels is amplified and then applied to the first conductive strip or the plurality of first conductive strips of the first conductive layer of the strain sensing part;

or, the analog driving signal output by one or more signal channels of the multiple signal channels is amplified and then applied to the second conductive strip or the multiple second conductive strips of the second conductive layer of the strain sensing part.

According to the battery safety detection apparatus of at least one embodiment of the present disclosure, the detection circuit includes:

a sense amplifier sensing induced charges of the first conductive layer or the second conductive layer of the strain sensing part and converting the sensed charges into an amplified induced voltage; and

an analog-to-digital converter that analog-to-digital converts the amplified induced voltage to generate a digital induced voltage that indicates a change in mutual capacitance between the first conductive layer and the second conductive layer and outputs the digital induced voltage to the controller.

The battery safety detection apparatus according to at least one embodiment of the present disclosure further includes a filter disposed between the sense amplifier and the analog-to-digital converter.

a differential amplifier that amplifies a sensing voltage of the first conductive layer or the second conductive layer of the strain sensing part to generate an amplified sensing voltage; and

and the analog-to-digital converter converts the amplified sensing voltage into a digital signal and outputs the digital signal to the controller.

According to the battery safety detection device of at least one embodiment of the present disclosure, the detection circuit further includes a differential anti-mixing filter disposed between the differential amplifier and the analog-to-digital converter.

According to another aspect of the present disclosure, there is provided a battery safety detecting apparatus including:

the strain sensing part comprises at least one strain sensing device, the strain sensing device comprises a first conducting layer and a second conducting layer, a preset interval is formed between the first conducting layer and the second conducting layer, the first conducting layer or the second conducting layer can respond to deformation of a battery to enable the position, corresponding to the deformation of the battery, of the first conducting layer to deform or the position, corresponding to the deformation of the battery, of the second conducting layer to deform, and the strain sensing part generates the strain electric signal based on the deformation of the first conducting layer or the deformation of the second conducting layer.

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 part of a battery safety detection device according to still another 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 a schematic structural view of a first conductive layer of a strain sensing part of a battery safety detection device according to an embodiment of the present disclosure.

Fig. 7 is a schematic structural view of a second conductive layer of a strain sensing part of a battery safety detection device according to an embodiment of the present disclosure.

Fig. 8 is a schematic structural view of a first conductive layer of a strain sensing part of a battery safety detection device according to still another embodiment of the present disclosure.

Fig. 9 is a schematic structural view of a second conductive layer of a strain sensing part of a battery safety detection device according to still another embodiment of the present disclosure.

Fig. 10 is a schematic structural view of a signal detection unit of a battery safety detection device according to an embodiment of the present disclosure.

Fig. 11 is a schematic configuration diagram of a driving circuit of a signal detection unit according to an embodiment of the present disclosure.

Fig. 12 is a schematic configuration diagram of a driving circuit of a signal detection section according to still another embodiment of the present disclosure.

Fig. 13 is a schematic configuration diagram of a detection circuit of the signal detection unit according to the embodiment of the present disclosure.

Fig. 14 is a schematic configuration diagram of a detection circuit of a signal detection section according to still another embodiment of the present disclosure.

Fig. 15 is a schematic configuration diagram of a detection circuit of a signal detection section according to still another embodiment of the present disclosure.

Fig. 16 is a schematic configuration diagram of a detection circuit of a signal detection section according to still another embodiment of the present disclosure.

Fig. 17 is a schematic diagram of a battery detection 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 part of a battery safety detection device according to still another 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 a schematic structural view of a first conductive layer of a strain sensing part of a battery safety detection device according to an embodiment of the present disclosure. Fig. 7 is a schematic structural view of a second conductive layer of a strain sensing part of a battery safety detection device according to an embodiment of the present disclosure. Fig. 8 is a schematic structural view of a first conductive layer of a strain sensing part of a battery safety detection device according to still another embodiment of the present disclosure. Fig. 9 is a schematic structural view of a second conductive layer of a strain sensing part of a battery safety detection device according to still another embodiment of the present disclosure. Fig. 10 is a schematic structural view of a signal detection unit of a battery safety detection device according to an 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 10.

According to one 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;

the strain sensing portion 12 includes at least one strain sensing device 120, the strain sensing device 120 includes a first conductive layer 121 and a second conductive layer 122, a preset distance 123 is provided between the first conductive layer 121 and the second conductive layer 122, the first conductive layer 121 or the second conductive layer 122 can change the preset distance 123 between a position of the first conductive layer 121 corresponding to the deformation and a position of the second conductive layer 122 corresponding to the deformation in response to the deformation of the battery 11, and a strain electrical signal is generated based on the change of the preset distance 123.

The first conductive layer 121 and the second conductive layer 122 have matching sizes, and the first conductive layer 121 and the second conductive layer 122 may be sheet-shaped conductive films, such as ITO (indium tin oxide) conductive layers.

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.

Fig. 3 shows a schematic structural diagram of the strain sensing part 12 according to an embodiment of the present disclosure, and the first conductive layer 121 and the second conductive layer 122 may be two sheet-shaped conductive films disposed oppositely.

According to the battery safety detecting apparatus of one embodiment of the present disclosure, a first driving voltage is applied to both ends of the first conductive layer 121, current sensing is performed on both ends of the first conductive layer 121, and a change in the preset interval 123 between the first conductive layer 121 and the second conductive layer 122 is determined based on a change in the sensed current; or, a second driving voltage is applied to both ends of the second conductive layer 122, current sensing is performed on both ends of the second conductive layer 122, and a change in the preset distance 123 between the first conductive layer 121 and the second conductive layer 122 is determined based on a change in the sensed current; alternatively, a first driving voltage is applied to both ends of the first conductive layer 121, current sensing is performed on both ends of the first conductive layer 121, a second driving voltage is applied to both ends of the second conductive layer 122, current sensing is performed on both ends of the second conductive layer 122, and a change in the preset gap 123 between the first conductive layer 121 and the second conductive layer 122 is determined based on a change in current at both ends of the first conductive layer 121 and a change in current at both ends of the second conductive layer 122.

In this embodiment, the strain electrical signal includes a change in current.

The first conductive layer 121 and the second conductive layer 122 may be both resistance strain devices, and when the deformation of the battery 11 or the deformation of the housing 15 causes the deformation of the first conductive layer 121 or the second conductive layer 122, the resistance value of the first conductive layer 121 or the second conductive layer 122 will change, so that the sensing current will change, and the deformation of the battery 11 or the housing 15 can be indicated based on the change of the sensing current.

In the above embodiment, the battery safety detection device preferably further includes the signal detection unit 13, and the signal detection unit 13 detects the strain electric signal generated by the strain sensing unit 12.

According to the battery safety detecting apparatus of the further embodiment of the present disclosure, a first driving current is applied to both ends of the first conductive layer 121, and voltage sensing is performed on both ends of the first conductive layer 121, and a change in the preset interval 123 between the first conductive layer 121 and the second conductive layer 122 is determined based on a change in the sensed voltage; or, a second driving current is applied to both ends of the second conductive layer 122, voltage sensing is performed on both ends of the second conductive layer 122, and a change in the preset distance 123 between the first conductive layer 121 and the second conductive layer 122 is determined based on a change in the sensed voltage; alternatively, a first driving current is applied to both ends of the first conductive layer 121, voltage sensing is performed on both ends of the first conductive layer 121, a second driving current is applied to both ends of the second conductive layer 122, voltage sensing is performed on both ends of the second conductive layer 122, and a change in the preset gap 123 between the first conductive layer 121 and the second conductive layer 122 is determined based on a change in voltage on both ends of the first conductive layer 121 and a change in voltage on both ends of the second conductive layer 122.

In this embodiment, the strain electrical signal includes a change in voltage.

The first conductive layer 121 and the second conductive layer 122 may be both resistance strain devices, and when the deformation of the battery 11 or the deformation of the housing 15 causes the deformation of the first conductive layer 121 or the second conductive layer 122, the resistance value of the first conductive layer 121 or the second conductive layer 122 will change, so that the sensing voltage will change, and the deformation of the battery 11 or the housing 15 can be indicated based on the change of the sensing voltage.

According to a battery safety detection apparatus according to still another embodiment of the present disclosure, the battery safety detection 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; the strain sensing part 12 comprises at least one strain sensing device 120, the strain sensing device 120 comprises a first conductive layer 121 and a second conductive layer 122, a preset distance 123 is formed between the first conductive layer 121 and the second conductive layer 122, the first conductive layer 121 or the second conductive layer 122 can respond to the deformation of the battery 11, so that the preset distance 123 between the position of the first conductive layer 121 corresponding to the deformation and the position of the second conductive layer 122 corresponding to the deformation changes, and a strain electrical signal is generated based on the change of the preset distance 123; the battery safety detection device further includes a signal detection unit 13, and the signal detection unit 13 measures a mutual capacitance formed by the first conductive layer 121 and the second conductive layer 122, and determines a change in the preset gap 123 based on a change in the mutual capacitance.

In this embodiment, the strain electrical signal includes a change in mutual capacitance.

The signal detection unit 13 may include a capacitance measuring circuit in the related art.

According to the battery safety detecting apparatus according to still another embodiment of the present disclosure, a first driving voltage is applied to both ends of the first conductive layer 121, and voltage sensing is performed on the second conductive layer 122, and whether the first conductive layer 121 and the second conductive layer 122 are in contact is determined based on whether a sensing voltage is generated.

That is, if the sensing voltage is generated, it indicates that contact between the first conductive layer 121 and the second conductive layer occurs due to deformation of the battery 11 or deformation of the case 15.

According to the battery safety detecting apparatus according to still another embodiment of the present disclosure, a second driving voltage is applied to both ends of the second conductive layer 122, and voltage sensing is performed on the first conductive layer 121, and whether the first conductive layer 121 and the second conductive layer 122 are in contact is determined based on whether a sensing voltage is generated.

According to the battery safety detecting apparatus of the preferred embodiment of the present disclosure, a driving voltage is alternately applied to both ends of the first conductive layer 121 and both ends of the second conductive layer 122, and when the driving voltage is applied to both ends of the first conductive layer 121, voltage sensing is performed on the second conductive layer 122, and when the driving voltage is applied to both ends of the second conductive layer 122, voltage sensing is performed on the first conductive layer 121; the contact position of the first conductive layer 121 and the second conductive layer 122 is determined based on at least the magnitude of a sensing voltage generated when the first conductive layer 121 is voltage-sensed and the magnitude of a sensing voltage generated when the second conductive layer 122 is voltage-sensed.

Here, two ends of the first conductive layer 121 to which the driving voltage is applied are two ends in a first direction, two ends of the second conductive layer 122 to which the driving voltage is applied are two ends in a second direction, and the first direction is perpendicular to the second direction.

A battery safety detecting apparatus according to still another embodiment of the present disclosure includes:

As shown in fig. 5 and 7, the first conductive layer 121 includes a plurality of first conductive strips 1211 arranged along a first direction, two adjacent first conductive strips 1211 are insulated from each other, the second conductive layer 122 includes a plurality of second conductive strips 1221 arranged along a second direction, two adjacent second conductive strips are insulated from each other, and the first direction is perpendicular to the second direction.

The dimension of the first conductive strip 1211 in the first direction may be set to be suitable for the deformation of the outer surface of the battery 11 or the deformation of the inner surface of the housing 15.

The dimension of second conductive strip 1221 in the second direction may be suitably set to accommodate the amount of deformation occurring at the outer surface of cell 11 or the amount of deformation occurring at the inner surface of housing 15.

For example, for convenience of explanation with reference to fig. 4 and 5, the first direction may be an X direction (horizontal direction of the paper surface), and the second direction may be a Y direction (vertical direction of the paper surface).

The insulation between the first conductive strips 1211 can be achieved by disposing an insulating substance, such as an insulating layer, between the adjacent first conductive strips 1211.

The insulation between the second conductive strips 1221 may be achieved by disposing an insulating substance, for example, an insulating layer, between the adjacent second conductive strips 1221.

Preferably, a second driving voltage is applied to both ends of all second conductive strips 1221 of the second conductive layer 122, and voltage sensing is performed on all first conductive strips 1211 of the first conductive layer 121, whether the first conductive layer 121 and the second conductive layer 122 are in contact is determined based on whether a sensing voltage is generated, and a contact position of the first conductive layer 121 and the second conductive layer 122 is determined based on a position of at least one first conductive strip 1211 generating the sensing voltage in the first conductive layer 121.

When the second driving voltage is applied to both ends of all the second conductive strips 1221 of the second conductive layer 122, the second driving voltage may be applied simultaneously or sequentially.

Preferably, a first driving voltage is applied to both ends of all first conductive strips 1221 of the first conductive layer 121, and voltage sensing is performed on all second conductive strips 1221 of the second conductive layer 122, whether the first conductive layer 121 and the second conductive layer 122 are in contact is determined based on whether a sensing voltage is generated, and a contact position of the first conductive layer 121 and the second conductive layer 122 is determined based on a position of at least one second conductive strip 1221 generating the sensing voltage in the second conductive layer 122.

When the first driving voltage is applied to both ends of all the first conductive strips 1221 of the first conductive layer 121 at the same time, the first driving voltage may be applied at the same time, or may be applied sequentially.

Preferably, the driving voltage is alternately applied to both ends of all first conductive strips 1211 of the first conductive layer 121 and both ends of all second conductive strips 1221 of the second conductive layer 122.

Voltage sensing is performed on all second conductive strips 1221 of second conductive layer 122 when a driving voltage is applied to both ends of all first conductive strips 1211 of first conductive layer 121, and voltage sensing is performed on all first conductive strips 1211 of first conductive layer 121 when a driving voltage is applied to both ends of all second conductive strips 1221 of second conductive layer 122.

At least one contact position of the first conductive layer 121 with the second conductive layer 122 is obtained based on at least the position of the at least one second conductive strip 1221 generating the sensing voltage in the second conductive layer 122 and the position of the at least one first conductive strip 1211 generating the sensing voltage in the first conductive layer 121.

For example, the predetermined distance 123 between the first conductive layer 121 and the second conductive layer 122 can be set to the maximum deformation of the battery 11 that can be tolerated (the battery can still be used safely).

In each of the above embodiments, preferably, the battery safety detection apparatus further includes a signal detection unit 13, and the signal detection unit 13 measures mutual capacitances formed between the first conductive strips 1211 and the second conductive strips 1221, and determines a position where the preset distance 123 between the first conductive layer 121 and the second conductive layer 122 changes based on a change in at least one mutual capacitance, so as to determine at least one deformation position of the battery.

As shown in fig. 8 and 9, the first conductive layer 121 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 conductive layer 122 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 arranged opposite to each second conductive element of the second rectangular conductive element array.

The number and shape of the first conductive elements shown in fig. 8 and 9 are exemplary.

With the battery safety detection apparatus of the above-described embodiment, it is preferable that the second driving voltage is applied to all the second conductive elements of the second conductive layer 122, and voltage sensing is performed on all the first conductive elements of the first conductive layer 121, whether the first conductive layer 121 and the second conductive layer 122 are in contact is determined based on whether the sensing voltage is generated, and a contact position of the first conductive layer 121 and the second conductive layer 122 is determined based on a position of at least one first conductive element generating the sensing voltage in the first conductive layer 121.

With the battery safety detection apparatus of the above-described embodiment, it is preferable that the first driving voltage is applied to all the first conductive elements of the first conductive layer 121 and voltage sensing is performed on all the second conductive elements of the second conductive layer 122, whether the first conductive layer 121 and the second conductive layer 122 are in contact is determined based on whether the sensing voltage is generated, and a contact position of the first conductive layer 121 and the second conductive layer 122 is determined based on a position of at least one second conductive element generating the sensing voltage in the second conductive layer 122.

With the battery safety detection device of the above-described embodiment, it is preferable that the driving voltage is alternately applied to all the first conductive elements of the first conductive layer 121 and all the second conductive elements of the second conductive layer 122.

When the driving voltage is applied to all the first conductive elements of the first conductive layer 121, all the second conductive elements of the second conductive layer 122 are voltage-sensed, and when the driving voltage is applied to all the second conductive elements of the second conductive layer 122, all the first conductive elements of the first conductive layer 121 are voltage-sensed.

At least one contact position of the first conductive layer 121 with the second conductive layer 122 is obtained based on at least the position of the at least one second conductive element generating the sensing voltage in the second conductive layer 122 and the position of the at least one first conductive element generating the sensing voltage in the first conductive layer 121.

For example, the preset spacing 123 between the first conductive layer 121 and the second conductive layer 122 may be set to be able to tolerate the maximum deformation of the battery 11.

In the above embodiment, the battery safety detection apparatus further includes the signal detection unit 13, and the signal detection unit 13 measures mutual capacitance formed by the first conductive element and the second conductive element, which are oppositely disposed in the first rectangular conductive element array and the second rectangular conductive element array, and determines a position where the preset distance 123 between the first conductive layer 121 and the second conductive layer 122 changes based on a change of at least one mutual capacitance, so as to determine at least one deformation position of the battery.

With the battery safety detection devices of the above respective embodiments, it is preferable that, as shown in fig. 5, the first conductive layer 121 is provided on the first substrate 125, and the second conductive layer 122 is provided on the second substrate 126.

The first substrate 125 and the second substrate 126 are both insulating substrates.

For example, the battery safety detecting device is disposed on the surface of the battery 11 through the first substrate 125 and the second substrate 126.

The first substrate 125 and the second substrate 126 are both flexible substrates. Such as PET film.

As shown in fig. 4 and 5, the above-described preset interval 123 is formed by the support part 124, and the support part 124 may be disposed between the first conductive layer 121 and the second conductive layer 122.

Preferably, the support 124 is disposed between the first substrate 125 and the second substrate 126.

The supporting portion 124 is made of an insulating material.

The supporting portion 124 may be disposed at the edge of the first conductive layer 121 and the second conductive layer 122, as shown in fig. 4.

Among them, the supporting portion 124 may be disposed at the edge of the first substrate 125 and the second substrate 126, as shown in fig. 5.

In the above embodiments, the supporting portion 124 may include a plurality of discrete supporting portions, or the supporting portion 124 may be a unitary structure, such as a square ring.

It will be understood by those skilled in the art that the strain sensing part 12 can be provided between two adjacent batteries 11, and the strain sensing part can be provided between the batteries 11 and the case 15.

It should be understood by those skilled in the art that the strain sensing part 12 can also generate a strain electric signal based on the deformation of the case 15 of the battery device 10.

For the battery safety detection device of each of the above embodiments, it is preferable that the signal detection section 13 includes, as shown in fig. 10: a drive circuit for supplying a drive signal to the strain sensing part 12; the detection circuit is used for detecting the power transformation signal; and a controller for supplying a drive signal to the strain sensing part 12 from the control drive circuit and processing the strain electric signal obtained by the detection circuit to generate a processed strain electric signal.

Preferably, the signal detection unit 13 further includes a memory for storing the strain electric signal processed by the controller.

The circuit structure of the signal detection unit of the present disclosure is further described below with reference to fig. 10 to 16.

According to one embodiment of the present disclosure, as shown in fig. 11, the drive circuit of the signal detection section 13 includes: a digital-to-analog converter 302, the digital-to-analog converter 302 converting the digital driving signal received from the controller into an analog driving signal; an amplifier 303, the amplifier 303 amplifying the analog driving signal to generate an amplified driving signal (Vs); and a multiplexer 304, the multiplexer 304 including a plurality of signal channels, the drive signal amplified by the amplifier 303 being applied to the strain sensitive portion 12 via one or more of the plurality of signal channels.

In the above embodiment, preferably, the driving signal amplified by the amplifier 303 is applied to one first conductive strip 1211 or a plurality of first conductive strips 1211 of the first conductive layer 121 of the strain sensing part 12 via one or more of the plurality of signal paths; alternatively, the driving signal amplified by the amplifier 303 is applied to one second conductive strip 1221 or a plurality of second conductive strips 1221 of the second conductive layer 122 of the strain sensing part 12 via one or more of the plurality of signal paths.

According to still another embodiment of the present disclosure, as shown in fig. 12, the driving circuit of the signal detection section 13 includes: a digital-to-analog converter 302, the digital-to-analog converter 302 converting the digital driving signal received from the controller into an analog driving signal; a multiplexer 304, the multiplexer 304 including a plurality of signal channels, the analog driving signal being output via one or more of the plurality of signal channels; and a plurality of amplifiers 303, each amplifier 303 amplifying an analog driving signal output via one signal channel of the multiplexer 304, the amplified analog driving signal being applied to the strain sensing part 12.

In the above embodiment, preferably, the analog driving signal output by one or more signal channels of the plurality of signal channels is amplified and then applied to the first conductive strip 1211 or the plurality of first conductive strips 1211 of the first conductive layer 121 of the strain sensing part 12; alternatively, the analog driving signal output from one or more of the signal channels is amplified and applied to one or more second

conductive strips

1221 or 1221 of the second conductive layer 122 of the strain sensing part 12.

According to still another embodiment of the present disclosure, as shown in fig. 13, the detection circuit of the signal detection section 13 includes: a sense amplifier 306, wherein the sense amplifier 306 senses the induced charges of the first conductive layer 121 or the second conductive layer 122 of the strain inductor 12 and converts the sensed charges into an amplified induced voltage; and an analog-to-digital converter 308, wherein the analog-to-digital converter 308 performs analog-to-digital conversion on the amplified induced voltage to generate a digital induced voltage and outputs the digital induced voltage to the controller, and the digital induced voltage indicates a change in mutual capacitance between the first conductive layer 121 and the second conductive layer 122.

In the above embodiment, preferably, as shown in fig. 14, the detection circuit further includes a filter 307, and the filter 307 is disposed between the sense amplifier 306 and the analog-to-digital converter 308.

According to still another embodiment of the present disclosure, as shown in fig. 15, the detection circuit of the signal detection section 13 includes: a differential amplifier 309, the differential amplifier 309 amplifying the sense voltage (Vb +, Vb-) of the first conductive layer 121 or the second conductive layer 122 of the strain sensitive portion 12 to generate an amplified sense voltage; and an analog-to-digital converter 311, wherein the analog-to-digital converter 311 converts the amplified sensing voltage into a digital signal and outputs the digital signal to the controller.

In the above embodiment, preferably, as shown in fig. 16, the detection circuit further includes a differential anti-mixing filter 310, and the differential anti-mixing filter 310 is disposed between the differential amplifier 309 and the analog-to-digital converter 311.

Fig. 16 also exemplarily shows the structure of the differential amplifier 309.

It will be understood by those skilled in the art that the battery safety detecting apparatus of the present disclosure may include a plurality of signal detecting parts 13 shown in fig. 10 to separately drive and detect the respective strain sensing parts 12. The battery safety detecting apparatus of the present disclosure may further include only one signal detecting part 13, and may drive and detect each strain sensing part 12 through a plurality of electrical channels.

The signal detection part 13 may be in the form of a chip or a PCB, and the specific form of the signal detection part 13 is not particularly limited in this disclosure.

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 indicative of an occurrence of a deformation based on the deformation of the battery 11 of the battery device 10.

The strain sensing portion 12 includes at least one strain sensing device 120, the strain sensing device 120 includes a first conductive layer 121 and a second conductive layer 122, a preset gap 123 is provided between the first conductive layer 121 and the second conductive layer 122, the first conductive layer 121 or the second conductive layer 122 can deform a position of the first conductive layer 121 corresponding to the deformation of the battery 11 or a position of the second conductive layer 122 corresponding to the deformation of the battery 11 in response to the deformation of the battery 11, and the strain sensing portion 12 generates a strain electrical signal based on the deformation of the first conductive layer 121 or the deformation of the second conductive layer 122.

The present disclosure also provides a battery management system including the battery safety detection apparatus of any one of the above embodiments. Fig. 17 shows the battery management system in which the signal detection section described above may be integrated into a chip, and the pin strain sensing section 1701 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

1. A battery safety detecting device, comprising:

2. The battery safety detecting device according to claim 1, wherein a first driving voltage is applied to both ends of the first conductive layer, and current sensing is performed on the both ends of the first conductive layer, and a change in the preset interval between the first conductive layer and the second conductive layer is determined based on a change in the sensed current;

the strain electrical signal includes a change in the current.

3. The battery safety detection device according to claim 2, further comprising a signal detection portion that detects the strain electric signal generated by the strain sensing portion.

4. The battery safety detecting device according to claim 1, wherein a first driving current is applied to both ends of the first conductive layer, and voltage sensing is performed on the both ends of the first conductive layer, and a change in the preset interval between the first conductive layer and the second conductive layer is determined based on a change in the sensed voltage;

the strain electrical signal includes a change in the voltage.

5. The battery safety detection device according to claim 4, further comprising a signal detection portion that detects the strain electric signal generated by the strain sensing portion.

6. The battery safety detection device according to claim 1, further comprising a signal detection portion that measures a mutual capacitance formed by the first conductive layer and the second conductive layer, and determines a change in the preset pitch based on a change in the mutual capacitance; the strain electrical signal includes a change in the mutual capacitance.

7. The battery safety detection device according to claim 6, further comprising a signal detection portion that detects the strain electric signal generated by the strain sensing portion.

8. The battery safety detection device according to claim 1, wherein a first driving voltage is applied to both ends of the first conductive layer, voltage sensing is performed on the second conductive layer, and whether the first conductive layer and the second conductive layer are in contact is determined based on whether a sensing voltage is generated.

9. A battery safety detecting device, comprising:

10. A battery management system, comprising: the battery safety detection device according to any one of claims 1 to 9.