Battery safety detection device and battery management system

Abstract

The present disclosure provides a battery safety detection device, comprising: at least one strain sensing part, the at least one strain sensing part being disposed on at least one surface of a battery of a battery device, the strain sensing part being capable of generating a strain electrical signal based on at least the deformation of the battery of the battery device, the strain electrical signal at least indicating the occurrence of the deformation; wherein, the strain sensing part includes at least one strain sensing device, the strain sensing device includes a plurality of conductive elements, the plurality of conductive elements are uniformly arranged in a two-dimensional array, and each conductive element is insulated from other conductive elements; the strain sensing device is capable of responding to the deformation of the battery to cause deformation of a position corresponding to the deformation of the battery in the two-dimensional array, and the strain sensing part generates a strain electrical signal based on the deformation of the two-dimensional array. The present disclosure also provides a battery management system.

Description

Technical Field

[0001] 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 Art

[0002] When a lithium battery is subjected to an external force, it will deform, and it will also bulge after battery aging. When the above problems occur in a lithium battery, problems such as internal short circuit, fire and explosion will occur. Therefore, the safety detection of lithium batteries is necessary.

[0003] How to effectively and accurately detect battery deformation and how to predict the faults that the battery will have are problems that need to be solved in the field of battery safety. Summary of the Invention

[0004] To solve one of the above technical problems, the present disclosure provides a battery safety detection device and a battery management system.

[0005] According to one aspect of the present disclosure, there is provided a battery safety detection device, including:

[0006] At least one strain sensing part, the at least one strain sensing part is disposed on at least one surface of the battery of the battery device, and the strain sensing part can at least generate a strain electrical signal based on the deformation of the battery of the battery device, and the strain electrical signal at least indicates the occurrence of the deformation;

[0007] Wherein, the strain sensing part includes at least one strain sensing device, the strain sensing device includes a plurality of conductive elements, the plurality of conductive elements are uniformly arranged in a two-dimensional array, and each conductive element is insulated from other conductive elements; the strain sensing device can respond to the deformation of the battery to cause the position of the two-dimensional array corresponding to the deformation of the battery to deform, and the strain sensing part generates the strain electrical signal based on the deformation of the two-dimensional array.

[0008] In the battery safety detection device according to at least one embodiment of the present disclosure, the strain electrical signal includes a self-capacitance change signal of any one conductive element of the two-dimensional array.

[0009] In the battery safety detection device according to at least one embodiment of the present disclosure, the strain electrical signal includes a mutual-capacitance change signal between two adjacent conductive elements of the two-dimensional array.

[0010] In the battery safety detection device according to 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, and the first direction is perpendicular to the second direction.

[0011] The battery safety detection device according to at least one embodiment of the present disclosure, wherein the two adjacent conductive elements are two conductive elements adjacent along a first direction or two conductive elements adjacent along a second direction, and the first direction is perpendicular to the second direction.

[0012] The battery safety detection device according to at least one embodiment of the present disclosure, wherein the strain electrical signal includes a mutual capacitance change signal between any two non-adjacent conductive elements of the two-dimensional array.

[0013] The battery safety detection device according to at least one embodiment of the present disclosure, wherein the strain sensing portion includes two strain sensing devices, the two strain sensing devices are disposed opposite to each other, and an insulating gap is provided between the two strain sensing devices.

[0014] The battery safety detection device according to at least one embodiment of the present disclosure, wherein the strain sensing portion includes a first strain sensing device and a second strain sensing device, the conductive element is a conductive strip, 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, adjacent two first conductive strips are insulated from each other, adjacent two second conductive strips are insulated from each other, and the first direction is perpendicular to the second direction.

[0015] The battery safety detection device according to at least one embodiment of the present disclosure, wherein the strain electrical 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.

[0016] The battery safety detection device according to at least one embodiment of the present disclosure, wherein the strain sensing portion 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.

[0017] The battery safety detection device according to at least one embodiment of the present disclosure, wherein the strain electrical signal includes a mutual capacitance change signal between the first conductive element and the second conductive element which are disposed opposite to each other in the first rectangular conductive element array and the second rectangular conductive element array.

[0018] The battery safety detection device according to at least one embodiment of the present disclosure, wherein the insulating gap is filled with a flexible insulating material.

[0019] A battery safety detection device according to at least one embodiment of the present disclosure applies a driving electrical signal to all conductive elements of the strain sensing device simultaneously, and measures the self-capacitance of each conductive element simultaneously. If the self-capacitance of a conductive element changes, a self-capacitance change signal is generated.

[0020] A battery safety detection device according to at least one embodiment of the present disclosure applies a driving electrical signal to each of all conductive elements of the strain sensing device in sequence, and measures the self-capacitance of each conductive element in sequence. If the self-capacitance of a conductive element changes, a self-capacitance change signal is generated.

[0021] A battery safety detection device according to at least one embodiment of the present disclosure determines the degree of deformation based on the magnitude of the self-capacitance change signal, and determines the deformation position based on the position of the conductive element whose self-capacitance has changed in the two-dimensional array.

[0022] A battery safety detection device according to at least one embodiment of the present disclosure divides the conductive elements arranged in the first direction of the two-dimensional array into multiple groups along the second direction, and simultaneously performs the following operations on each group of conductive elements of the multiple groups of conductive elements:

[0023] Apply a driving electrical signal to the mutual capacitors formed by two adjacent conductive elements in sequence, and measure the mutual capacitance. If the mutual capacitance changes, a mutual capacitance change signal is generated.

[0024] A battery safety detection device according to at least one embodiment of the present disclosure divides the conductive elements arranged in the first direction of the two-dimensional array into multiple groups along the second direction, and performs the following operations on each group of conductive elements of the multiple groups of conductive elements in sequence:

[0025] Apply a driving electrical signal to the mutual capacitors formed by two adjacent conductive elements in sequence, and measure the mutual capacitance. If the mutual capacitance changes, a mutual capacitance change signal is generated.

[0026] A battery safety detection device according to at least one embodiment of the present disclosure divides the conductive elements arranged in the second direction of the two-dimensional array into multiple groups along the first direction, and simultaneously performs the following operations on each group of conductive elements of the multiple groups of conductive elements:

[0027] Apply a driving electrical signal to the mutual capacitors formed by two adjacent conductive elements in sequence, and measure the mutual capacitance. If the mutual capacitance changes, a mutual capacitance change signal is generated.

[0028] A battery safety detection device according to at least one embodiment of the present disclosure divides the conductive elements arranged in the second direction of the two-dimensional array into multiple groups along the first direction, and performs the following operations on each group of conductive elements in the multiple groups of conductive elements in sequence:

[0029] Apply a driving electrical signal to the mutual capacitors formed by two adjacent conductive elements in sequence, measure the mutual capacitance, and generate a mutual capacitance change signal if the mutual capacitance changes.

[0030] A battery safety detection device according to at least one embodiment of the present disclosure divides the conductive elements arranged in the first direction of the two-dimensional array into multiple groups along the second direction, and performs the following operations on each group of conductive elements in the multiple groups of conductive elements simultaneously:

[0031] Apply a driving electrical signal to the mutual capacitors formed by two conductive elements with a predetermined conductive element interval in sequence, measure the mutual capacitance, and generate a mutual capacitance change signal if the mutual capacitance changes.

[0032] A battery safety detection device according to at least one embodiment of the present disclosure divides the conductive elements arranged in the second direction of the two-dimensional array into multiple groups along the first direction, and performs the following operations on each group of conductive elements in the multiple groups of conductive elements simultaneously:

[0033] Apply a driving electrical signal to the mutual capacitors formed by two conductive elements with a predetermined conductive element interval in sequence, measure the mutual capacitance, and generate a mutual capacitance change signal if the mutual capacitance changes.

[0034] A battery safety detection device according to at least one embodiment of the present disclosure divides the conductive elements arranged in the first direction of the two-dimensional array into multiple groups along the second direction, and performs the following operations on each group of conductive elements in the multiple groups of conductive elements in sequence:

[0035] Apply a driving electrical signal to the mutual capacitors formed by two conductive elements with a predetermined conductive element interval in sequence, measure the mutual capacitance, and generate a mutual capacitance change signal if the mutual capacitance changes.

[0036] A battery safety detection device according to at least one embodiment of the present disclosure divides the conductive elements arranged in the second direction of the two-dimensional array into multiple groups along the first direction, and performs the following operations on each group of conductive elements in the multiple groups of conductive elements in sequence:

[0037] Apply a driving electrical signal to the mutual capacitors formed by two conductive elements with a predetermined conductive element interval in sequence, measure the mutual capacitance, and generate a mutual capacitance change signal if the mutual capacitance changes.

[0038] A battery safety detection device according to 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 the same planar region;

[0039] The first sub-array includes a plurality of first series conductive element groups, the first series conductive element groups include a plurality of conductive elements connected in series along a first direction, and the plurality of first series conductive element groups are arranged along a second direction; each of the first series conductive element groups is insulated from each other;

[0040] The second sub-array includes a plurality of second series conductive element groups, the second series conductive element groups include a plurality of conductive elements connected in series along the second direction, and the plurality of second series conductive element groups are arranged along the first direction; each of the second series conductive element groups is insulated from each other;

[0041] The first sub-array and the second sub-array are insulated from each other;

[0042] The first direction and the second direction are perpendicular to each other.

[0043] A battery safety detection device according to 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.

[0044] A battery safety detection device according to at least one embodiment of the present disclosure, a driving electrical 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, and 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 if the self-capacitance changes, a self-capacitance change signal is generated.

[0045] A battery safety detection device according to at least one embodiment of the present disclosure, based on the position information of at least one first series conductive element group with a changed self-capacitance in the first sub-array and the position information of at least one second series conductive element group with a changed self-capacitance in the second sub-array, the deformation position of the two-dimensional array is determined.

[0046] A battery safety detection device according to at least one embodiment of the present disclosure, a driving electrical 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, and the mutual capacitances of the mutual capacitors formed by each of the first series conductive element groups of the first sub-array and each of the second series conductive element groups of the second sub-array are simultaneously measured, and if the mutual capacitance changes, a mutual-capacitance change signal is generated.

[0047] The battery safety detection device according to at least one embodiment of the present disclosure determines the deformation position of the two-dimensional array based on the position information of the first series conductive element group of the mutual capacitor with a changed mutual capacitance in the first sub-array and the position information of the second series conductive element group in the second sub-array.

[0048] The battery safety detection device according to at least one embodiment of the present disclosure is characterized in that the strain sensing portion further includes a first substrate layer and a second substrate layer, and the strain sensing device is disposed between the first substrate layer and the second substrate layer and is held by the first substrate layer and the second substrate layer.

[0049] For the battery safety detection device according to at least one embodiment of the present disclosure, both the first substrate layer and the second substrate layer are insulating materials.

[0050] For the battery safety detection device according to at least one embodiment of the present disclosure, both the first substrate layer and the second substrate layer are flexible substrates.

[0051] The battery safety detection device according to at least one embodiment of the present disclosure, the strain sensing portion further includes a first substrate layer and a second substrate layer, and two of the strain sensing devices are respectively disposed on the first substrate layer and the second substrate layer.

[0052] The battery safety detection device according to at least one embodiment of the present disclosure, the strain sensing portion further includes a support portion, and the support portion is disposed between the first substrate layer and the second substrate layer.

[0053] For the battery safety detection device according to at least one embodiment of the present disclosure, the support portion is disposed at the edge of the first substrate layer and the second substrate layer.

[0054] For the battery safety detection device according to at least one embodiment of the present disclosure, the support portion includes a plurality of discrete support portions, or the support portion is an integral structure.

[0055] For the battery safety detection device according to at least one embodiment of the present disclosure, both the first substrate layer and the second substrate layer are insulating materials.

[0056] For the battery safety detection device according to at least one embodiment of the present disclosure, both the first substrate layer and the second substrate layer are flexible materials.

[0057] For the battery safety detection device according to at least one embodiment of the present disclosure, the strain sensing portion can be disposed between two adjacent batteries.

[0058] A battery safety detection device according to at least one embodiment of the present disclosure, wherein the strain sensing portion can be disposed between the battery and the housing.

[0059] A battery safety detection device according to at least one embodiment of the present disclosure, wherein the strain sensing portion can also generate the strain electrical signal based on the deformation of the housing of the battery device.

[0060] A battery safety detection device according to at least one embodiment of the present disclosure further includes a driving and detecting portion, which applies a driving electrical signal to the strain sensing portion and detects the strain electrical signal generated by the strain sensing portion.

[0061] A battery safety detection device according to at least one embodiment of the present disclosure, wherein the driving and detecting portion includes: a driving circuit for providing a driving electrical signal to the strain sensing portion; a detecting circuit for detecting the strain electrical signal; and a controller for controlling the driving circuit to provide a driving signal to the strain sensing portion and processing the strain electrical signal obtained by the detecting circuit to generate a processed strain electrical signal.

[0062] A battery safety detection device according to at least one embodiment of the present disclosure, wherein the driving and detecting portion further includes a memory for storing the strain electrical signal processed by the controller.

[0063] A battery safety detection device according to at least one embodiment of the present disclosure, wherein the detecting circuit includes a capacitance detecting circuit for detecting the self-capacitance change signal of each conductive element and / or the mutual-capacitance change signal between two conductive elements.

[0064] A battery safety detection device according to at least one embodiment of the present disclosure, wherein the capacitance detecting circuit includes a charge signal conversion sub-circuit for converting the self-capacitance accumulated charge of each conductive element into a voltage signal and / or converting the mutual-capacitance accumulated charge between two conductive elements into a voltage signal.

[0065] A battery safety detection device according to at least one embodiment of the present disclosure, wherein the capacitance detecting circuit further includes a signal post-processing circuit for post-processing the voltage signal output by the charge signal conversion sub-circuit, and the post-processing includes filtering processing and analog-to-digital conversion processing.

[0066] A battery safety detection device according to at least one embodiment of the present disclosure, wherein the charge signal conversion sub-circuit includes a first amplifier; a driving signal is applied to the self-capacitance or the mutual-capacitance; and the first amplifier converts the accumulated charge of the self-capacitance or the mutual-capacitance into a voltage signal.

[0067] For the battery safety detection device according to at least one embodiment of the present disclosure, the signal post-processing circuit further includes a demodulator, an oscillator, an accumulator, and a register.

[0068] For the battery safety detection device according to at least one embodiment of the present disclosure, the capacitance detection circuit includes a charge signal conversion sub-circuit, and the charge signal conversion sub-circuit converts the self-capacitance accumulated charge of each conductive element into a frequency signal, and / or converts the mutual-capacitance accumulated charge between two conductive elements into a frequency signal.

[0069] For the battery safety detection device according to 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. The 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, and 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 electrical signal. The multiplexer adjusts the amplitude of the square wave electrical signal, and the frequency of the square wave electrical signal output by the multiplexer is a function of the charging and discharging current of the self-capacitance or the mutual-capacitance.

[0070] For the battery safety detection device according to at least one embodiment of the present disclosure, the capacitance detection circuit includes a charge signal conversion sub-circuit, and the charge signal conversion sub-circuit converts the self-capacitance accumulated charge of each conductive element into a pulse width signal, and / or converts the mutual-capacitance accumulated charge between two conductive elements into a pulse width signal.

[0071] For the battery safety detection device according to 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 the input terminal and the output terminal of the transconductance amplifier. 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. When the triangular waveform voltage signal is greater than the threshold voltage signal, the comparator outputs a high level.

[0072] For the battery safety detection device according to at least one embodiment of the present disclosure, the capacitance detection circuit includes a charge signal conversion sub-circuit, and the charge signal conversion sub-circuit converts the self-capacitance accumulated charge of each conductive element into a digital signal, and / or converts the mutual-capacitance accumulated charge between two conductive elements into a digital signal.

[0073] A battery safety detection device according to 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 charge of the mutual capacitance or the self-capacitance and convert it into a voltage signal, and the integrator is controlled to accumulate the accumulated charge of the capacitance difference between the self-capacitance or the mutual capacitance and the reference capacitance and convert it into a voltage signal. Based on the positive or negative of the voltage signal, the comparator outputs a high level or a low level.

[0074] A battery safety detection device according to at least one embodiment of the present disclosure, the capacitance detection circuit includes a charge signal conversion sub-circuit and a signal amplification sub-circuit. The charge signal conversion sub-circuit converts the accumulated charge of the self-capacitance of each conductive element into a voltage signal, and / or converts the accumulated charge of the mutual capacitance between two conductive elements into a voltage signal. The signal amplification sub-circuit amplifies the voltage signal to generate an amplified voltage signal.

[0075] A battery safety detection device according to at least one embodiment of the present disclosure, the capacitance detection circuit further includes a signal post-processing sub-circuit, and the signal post-processing sub-circuit at least includes a filter and an analog-to-digital converter.

[0076] A battery safety detection device according to at least one embodiment of the present disclosure, the charge signal conversion sub-circuit includes a reference capacitance, a first amplifier, and a second amplifier. The first amplifier converts the accumulated charge of the self-capacitance or the mutual capacitance into a first voltage signal, and the second amplifier converts the accumulated charge of the reference capacitance into a second voltage signal.

[0077] A battery safety detection device according to at least one embodiment of the present disclosure, the signal amplification sub-circuit includes a common-mode amplifier, and the common-mode amplifier amplifies the difference between the first voltage signal and the second voltage signal and then outputs it.

[0078] A battery safety detection device according to at least one embodiment of the present disclosure, the charge signal conversion sub-circuit includes a reference capacitance, a first amplifier, a second amplifier, and a rectifier & filter. The first amplifier converts the accumulated charge of the self-capacitance or the mutual capacitance into a first voltage signal, the second amplifier converts the accumulated charge of the reference capacitance into a second voltage signal, and the rectifier & filter rectifies and filters the first voltage signal and the second voltage signal respectively and then outputs them.

[0079] A battery safety detection device according to at least one embodiment of the present disclosure, the signal amplification sub-circuit includes an instrumentation amplifier, and the instrumentation amplifier amplifies the difference between the first voltage signal and the second voltage signal and then outputs it.

[0080] According to another aspect of the present disclosure, there is provided a battery management system, including: the battery safety detection device of any one of the above. BRIEF DESCRIPTION OF THE DRAWINGS

[0081] The drawings illustrate exemplary embodiments of the present disclosure and, together with the description thereof, are used to explain the principles of the present disclosure. These drawings are included to provide a further understanding of the present disclosure and are included in this specification and form a part of this specification.

[0082] Figure 1 Schematic structural diagram of a battery device provided with a battery safety detection device according to an embodiment of the present disclosure.

[0083] Figure 2 Schematic structural diagram of a battery device provided with a battery safety detection device according to another embodiment of the present disclosure.

[0084] Figure 3 Schematic structural diagram of a strain sensing part of a battery safety detection device according to an embodiment of the present disclosure.

[0085] Figure 4 Schematic structural diagram of a strain sensing device of a strain sensing part of a battery safety detection device according to an embodiment of the present disclosure.

[0086] Figure 5 Schematic structural diagram of a strain sensing part of a battery safety detection device according to another embodiment of the present disclosure.

[0087] Figure 6 One of the schematic diagrams showing the manner in which conductive elements of a strain sensing device of a strain sensing part of a battery safety detection device according to an embodiment of the present disclosure can form a mutual capacitor.

[0088] Figure 7 Schematic structural diagram of a strain sensing part of a battery safety detection device according to another embodiment of the present disclosure.

[0089] Figure 8 Schematic structural diagram of one of the strain sensing devices of a strain sensing part of a battery safety detection device according to another embodiment of the present disclosure.

[0090] Figure 9 Schematic structural diagram of the second strain sensing device of a strain sensing part of a battery safety detection device according to another embodiment of the present disclosure.

[0091] Figure 10 Schematic structural diagram of a strain sensing device of a strain sensing part of a battery safety detection device according to another embodiment of the present disclosure.

[0092] Figure 11For Figure 10 Schematic structural diagram of the first sub-array of the strain sensing device shown in

[0093] Figure 12 For Figure 10 Schematic structural diagram of the second sub-array of the strain sensing device shown in

[0094] Figure 13 Schematic structural diagram of the strain sensing device of the strain sensing part of the battery safety detection device according to another embodiment of the present disclosure.

[0095] Figure 14 Schematic structural diagram of the drive detection part of the battery safety detection device according to an embodiment of the present disclosure.

[0096] Figure 15 Schematic structural diagram of the detection circuit of the drive detection part of the battery safety detection device according to an embodiment of the present disclosure.

[0097] Figure 16 Schematic structural diagram of the charge signal conversion sub-circuit of the detection circuit of the drive detection part of the battery safety detection device according to an embodiment of the present disclosure.

[0098] Figure 17 Schematic structural diagram of the charge signal conversion sub-circuit of the detection circuit of the drive detection part of the battery safety detection device according to another embodiment of the present disclosure.

[0099] Figure 18 Schematic structural diagram of the detection circuit of the drive detection part of the battery safety detection device according to an embodiment of the present disclosure.

[0100] Figure 19 Schematic structural diagram of the charge signal conversion sub-circuit of the detection circuit of the drive detection part of the battery safety detection device according to another embodiment of the present disclosure.

[0101] Figure 20 Schematic structural diagram of the charge signal conversion sub-circuit of the detection circuit of the drive detection part of the battery safety detection device according to another embodiment of the present disclosure.

[0102] Figure 21 Schematic structural diagram of the charge signal conversion sub-circuit of the detection circuit of the drive detection part of the battery safety detection device according to another embodiment of the present disclosure.

[0103] Figure 22 For Figure 21 Timing diagram of the clock signal (ck) and the output (D) of the comparator in

[0104] Figure 23Schematic diagram of the detection circuit of the drive detection unit of the battery safety detection device according to another embodiment of the present disclosure.

[0105] Figure 24 Schematic diagram of the detection circuit of the drive detection unit of the battery safety detection device according to another embodiment of the present disclosure.

[0106] Figure 25 Schematic diagram of the detection circuit of the drive detection unit of the battery safety detection device according to another embodiment of the present disclosure.

[0107] Figure 26 Schematic diagram of a battery management system according to an embodiment of the present disclosure. Detailed implementation mode

[0108] The present disclosure will be further described in detail below in conjunction with the accompanying drawings and embodiments. It can be understood that the specific implementation modes described herein are only used to explain the relevant content and do not limit the present disclosure. Additionally, it should be noted that for the sake of description, only parts related to the present disclosure are shown in the drawings.

[0109] It should be noted that, without conflict, the embodiments in the present disclosure and the features in the embodiments can be combined with each other. The technical solutions of the present disclosure will be described in detail below with reference to the accompanying drawings and embodiments.

[0110] Unless otherwise specified, the exemplary embodiments / Examples shown are understood to provide exemplary features of various details of some ways in which the technical concept of the present disclosure can be implemented in practice. Therefore, unless otherwise specified, without departing from the technical concept of the present disclosure, the features of various embodiments / Examples can be additionally combined, separated, interchanged, and / or rearranged.

[0111] In the drawings, cross-hatching and / or shading are generally used to make the boundaries between adjacent components clear. Thus, unless stated, the presence or absence of cross-hatching or shading does not convey or imply any preference or requirement for the specific materials, material properties, dimensions, proportions, commonalities between the components shown, and / or any other characteristics, attributes, properties, etc. of the components. Additionally, in the drawings, for clarity and / or descriptive purposes, the dimensions and relative dimensions of the components may be exaggerated. When the exemplary embodiments can be implemented differently, the specific process sequences can be performed in a different order than described. For example, two consecutively described processes can be performed substantially simultaneously or in an order opposite to the described order. Additionally, the same reference numerals denote the same components.

[0112] When a component is referred to as being “on” or “above” another component, “connected to” or “coupled to” another component, the component can be directly on the other component, directly connected to or directly coupled to the other component, or there can be intervening components. However, when a component is referred to as being “directly on” another component, “directly connected to” or “directly coupled to” another component, there are no intervening components. For this reason, the term “connected” can refer to physical connection, electrical connection, etc., and can have or not have intervening components.

[0113] For descriptive purposes, the present disclosure may use spatial relative terms such as “under”, “below”, “beneath”, “lower”, “above”, “upper”, “on”, “over”, “higher” and “side (e.g., as in “sidewall”)” etc., so as to describe the relationship of one component to another (other) component as shown in the drawings. In addition to the orientation depicted in the drawings, the spatial relative terms are also intended to encompass different orientations of the device during use, operation and / or manufacture. For example, if the device in the drawings is flipped, a component described as “under” or “beneath” another component or feature will then be positioned “above” the other component or feature. Thus, the exemplary term “under” can encompass both “above” and “under” orientations. In addition, the device can be otherwise positioned (e.g., rotated 90 degrees or at other orientations), and thus, the spatial relative descriptors used herein are to be interpreted accordingly.

[0114] The terms used herein are for the purpose of describing particular embodiments and are not intended to be limiting. As used herein, unless the context clearly indicates otherwise, the singular forms “a”, “an” and “the” are also intended to include the plural forms. In addition, when the terms “comprises” and / or “comprising” and their variants are used in this specification, it is stated that there are the stated features, integers, steps, operations, components, assemblies and / or groups thereof, but does not preclude the presence or addition of one or more other features, integers, steps, operations, components, assemblies and / or groups thereof. It should also be noted that, as used herein, the terms “substantially”, “about” and other similar terms are used as approximate terms and not as degree terms, so that they are used to explain the inherent deviations of measured values, calculated values and / or provided values that would be recognized by a person of ordinary skill in the art.

[0115] The present disclosure provides a battery safety detection device, wherein the battery safety detection device can be at least used to detect the deformation of a battery, and the deformation can be a bulging deformation of the battery or a deformation formed after the battery is externally squeezed. The reasons for the external squeeze can include, for example, collision or acceleration, etc.

[0116] Figure 1Schematic diagram of a battery device provided with a battery safety detection device according to an embodiment of the present disclosure. Figure 2 Schematic diagram of a battery device provided with a battery safety detection device according to another embodiment of the present disclosure. Figure 3 Schematic diagram of a strain sensing part of a battery safety detection device according to an embodiment of the present disclosure. Figure 4 Schematic diagram of a strain sensing device of a strain sensing part of a battery safety detection device according to an embodiment of the present disclosure. Figure 5 Schematic diagram of a strain sensing part of a battery safety detection device according to another embodiment of the present disclosure. Figure 6 One of the schematic diagrams of the way in which conductive elements between strain sensing devices of a strain sensing part of a battery safety detection device according to an embodiment of the present disclosure can form a mutual capacitor. Figure 7 Schematic diagram of a strain sensing part of a battery safety detection device according to another embodiment of the present disclosure. Figure 8 Schematic diagram of one of the strain sensing devices of a strain sensing part of a battery safety detection device according to another embodiment of the present disclosure. Figure 9 Schematic diagram of the second of the strain sensing devices of a strain sensing part of a battery safety detection device according to another embodiment of the present disclosure. Figure 10 Schematic diagram of a strain sensing device of a strain sensing part of a battery safety detection device according to another embodiment of the present disclosure. Figure 11 For Figure 10 Schematic diagram of the first sub-array of the strain sensing device shown in Figure 12 For Figure 10 Schematic diagram of the second sub-array of the strain sensing device shown in Figure 13 Schematic diagram of a strain sensing device of a strain sensing part of a battery safety detection device according to another embodiment of the present disclosure. Figure 14 Schematic diagram of a drive detection part of a battery safety detection device according to an embodiment of the present disclosure. Figure 15 Schematic diagram of a detection circuit of a drive detection part of a battery safety detection device according to an embodiment of the present disclosure. Figure 16 Schematic diagram of a charge signal conversion sub-circuit of a detection circuit of a drive detection part of a battery safety detection device according to an embodiment of the present disclosure. Figure 17 Schematic diagram of a charge signal conversion sub-circuit of a detection circuit of a drive detection part of a battery safety detection device according to another embodiment of the present disclosure. Figure 18 Schematic diagram of a detection circuit of a drive detection part of a battery safety detection device according to an embodiment of the present disclosure. Figure 19 Schematic diagram of a charge signal conversion sub-circuit of a detection circuit of a drive detection part of a battery safety detection device according to another embodiment of the present disclosure.Figure 20 Schematic diagram of a charge signal conversion sub - circuit of a detection circuit of a drive detection unit of a battery safety detection device according to another embodiment of the present disclosure. Figure 21 Schematic diagram of a charge signal conversion sub - circuit of a detection circuit of a drive detection unit of a battery safety detection device according to another embodiment of the present disclosure. Figure 22 is Figure 21 the timing diagram of the clock signal (ck) and the output (D) of the comparator in Figure 23 Schematic diagram of a detection circuit of a drive detection unit of a battery safety detection device according to another embodiment of the present disclosure. Figure 24 Schematic diagram of a detection circuit of a drive detection unit of a battery safety detection device according to another embodiment of the present disclosure. Figure 25 Schematic diagram of a detection circuit of a drive detection unit of a battery safety detection device according to another embodiment of the present disclosure. Figure 26 Schematic diagram of a battery management system according to an embodiment of the present disclosure.

[0117] The following combines Figures 1 to 26 to make a detailed description of the battery safety detection device and the battery management system of the present disclosure.

[0118] According to an embodiment of the present disclosure, a battery safety detection device includes:

[0119] At least one strain sensing unit 12, the at least one strain sensing unit 12 is disposed on at least one surface of the battery 11 of the battery device 10, and the strain sensing unit 12 can at least generate a strain electrical signal based on the deformation of the battery 11 of the battery device 10, and the strain electrical signal at least indicates the occurrence of the deformation;

[0120] Wherein, the strain sensing unit 12 includes at least one strain sensing device 121, the strain sensing device 121 includes a plurality of conductive elements 1211, the plurality of conductive elements 1211 are uniformly arranged in a two - dimensional array, and each conductive element 1211 is insulated from other conductive elements 1211; the strain sensing device 121 can respond to the deformation of the battery such that the position corresponding to the deformation of the battery in the two - dimensional array deforms, and the strain sensing unit 12 generates a strain electrical signal based on the deformation of the two - dimensional array.

[0121] The conductive element 1211 can be a sheet - shaped conductive film, such as ITO (indium tin oxide).

[0122] It can be seen from Figure 1 that 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. It can be seen from Figure 2 that the battery device 10 includes a plurality of batteries 11, Figure 2Exemplarily, four batteries 11 are shown. The battery 11 can be a battery pack including a plurality of battery cells or a single battery cell.

[0123] Figure 1 The battery safety detection device shown in the figure has four strain sensing parts 12, and the four strain sensing parts 12 are respectively arranged between the four sides of the battery 11 and the housing 15. The strain sensing part 12 can also be arranged between the top surface of the battery 11 and the housing 15, or between the bottom surface of the battery 11 and the housing 15.

[0124] Figure 2 Strain sensing parts 12 are arranged between the respective batteries 11 of the battery device 10 shown in the figure, and strain sensing parts 12 are also arranged between the side surface of the battery 11 and the housing 15.

[0125] Those skilled in the art should understand that Figure 1 and Figure 2 the number of the batteries 11 shown and the arrangement positions of the strain sensing parts 12 are all exemplary.

[0126] For the battery safety detection device of the above embodiment, the strain electrical signal includes the self-capacitance change signal of any one conductive element 1211 in the two-dimensional array.

[0127] For the battery safety detection device of the above embodiment, the strain electrical signal includes the mutual-capacitance change signal between two adjacent conductive elements 1211 in the two-dimensional array.

[0128] According to a battery safety detection device of an embodiment of the present disclosure, as Figure 4 shown, 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, and the first direction is perpendicular to the second direction.

[0129] In the above embodiment, 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.

[0130] According to an alternative preferred embodiment of the present disclosure for the battery safety detection device, the strain electrical signal includes the mutual-capacitance change signal between any two non-adjacent conductive elements 1211 in the two-dimensional array.

[0131] Figure 3 The strain sensing part 12 shown has only one strain sensing device 121, Figure 5 The strain sensing part 12 shown has two strain sensing devices 121.

[0132] As Figure 5As shown, the strain sensing unit 12 includes two strain sensing devices 121, the two strain sensing devices 121 are arranged oppositely, and an insulating gap is provided between the two strain sensing devices 121.

[0133] The above-mentioned insulating gap can be realized by a flexible insulating substance, and the above-mentioned insulating gap can also be air or vacuum.

[0134] For the battery safety detection device of each of the above embodiments, preferably, a driving electrical signal is applied to all the conductive elements 1211 of the strain sensing device 121 simultaneously, and the self-capacitance of each conductive element 1211 is measured simultaneously. If the self-capacitance of the conductive element 1211 changes, a self-capacitance change signal is generated.

[0135] For the battery safety detection device of each of the above embodiments, preferably, a driving electrical signal is applied to each of the conductive elements 1211 of all the conductive elements 1211 of the strain sensing device 121 in sequence, and the self-capacitance of each conductive element 1211 is measured in sequence. If the self-capacitance of the conductive element 1211 changes, a self-capacitance change signal is generated.

[0136] In each of the above embodiments, the degree of deformation is judged based on the magnitude of the self-capacitance change signal, and the position of the deformation is judged based on the position of the conductive element 1211 whose self-capacitance changes in the two-dimensional array.

[0137] For the battery safety detection device of each of the above embodiments, preferably, as Figure 4 shown, for the conductive elements 1211 arranged along the first direction (the horizontal direction shown in the figure) of the two-dimensional array, they are divided into multiple groups along the second direction. For each group of the multiple groups of conductive elements 1211, the following operations are performed simultaneously:

[0138] A driving electrical signal is applied to the mutual capacitors formed by two adjacent conductive elements 1211 in sequence, and the mutual capacitance is measured. If the mutual capacitance changes, a mutual capacitance change signal is generated.

[0139] For the battery safety detection device of each of the above embodiments, preferably, as Figure 4 shown, for the conductive elements 1211 arranged along the first direction (the horizontal direction shown in the figure) of the two-dimensional array, they are divided into multiple groups along the second direction. For each group of the multiple groups of conductive elements 1211, the following operations are performed in sequence:

[0140] A driving electrical signal is applied to the mutual capacitors formed by two adjacent conductive elements 1211 in sequence, and the mutual capacitance is measured. If the mutual capacitance changes, a mutual capacitance change signal is generated.

[0141] For the battery safety detection device of each of the above embodiments, preferably, as Figure 4 shown, for the conductive elements 1211 arranged in the second direction (the vertical direction shown in the figure) of the two-dimensional array, divided into multiple groups along the first direction, the following operations are simultaneously performed on each group of conductive elements 1211 of the multiple groups of conductive elements 1211:

[0142] Apply drive electrical signals to the mutual capacitors formed by two adjacent conductive elements 1211 in sequence, measure the mutual capacitance, and generate a mutual capacitance change signal if the mutual capacitance changes.

[0143] For the battery safety detection device of each of the above embodiments, preferably, as Figure 4 shown, for the conductive elements 1211 arranged in the second direction (the vertical direction shown in the figure) of the two-dimensional array, divided into multiple groups along the first direction, the following operations are performed on each group of conductive elements 1211 of the multiple groups of conductive elements 1211 in sequence:

[0144] Apply drive electrical signals to the mutual capacitors formed by two adjacent conductive elements 1211 in sequence, measure the mutual capacitance, and generate a mutual capacitance change signal if the mutual capacitance changes.

[0145] For the battery safety detection device of each of the above embodiments, preferably, as Figure 4 shown, for the conductive elements 1211 arranged in the first direction (the horizontal direction shown in the figure) of the two-dimensional array, divided into multiple groups along the second direction, the following operations are simultaneously performed on each group of conductive elements 1211 of the multiple groups of conductive elements 1211:

[0146] Apply drive electrical signals to the mutual capacitors formed by two conductive elements 1211 with a predetermined conductive element interval in sequence, measure the mutual capacitance, and generate a mutual capacitance change signal if the mutual capacitance changes.

[0147] For the battery safety detection device of each of the above embodiments, preferably, as Figure 4 shown, for the conductive elements 1211 arranged in the second direction (the vertical direction shown in the figure) of the two-dimensional array, divided into multiple groups along the first direction, the following operations are simultaneously performed on each group of conductive elements 1211 of the multiple groups of conductive elements 1211:

[0148] Apply drive electrical signals to the mutual capacitors formed by two conductive elements 1211 with a predetermined conductive element interval in sequence, measure the mutual capacitance, and generate a mutual capacitance change signal if the mutual capacitance changes.

[0149] For the battery safety detection device of each of the above embodiments, preferably, as Figure 4As shown in the figure, for the conductive elements 1211 arranged in the first direction (the horizontal direction shown in the figure) of the two-dimensional array, they are divided into multiple groups along the second direction. For each group of the conductive elements 1211 in the multiple groups of conductive elements 1211, the following operations are performed in sequence:

[0150] Drive electrical signals are sequentially applied to the mutual capacitors formed by two conductive elements 1211 with a predetermined conductive element interval, and the mutual capacitance is measured. If the mutual capacitance changes, a mutual capacitance change signal is generated.

[0151] For the battery safety detection device of each of the above embodiments, preferably, as Figure 4 As shown in the figure, for the conductive elements 1211 arranged in the second direction (the vertical direction shown in the figure) of the two-dimensional array, they are divided into multiple groups along the first direction. For each group of the conductive elements 1211 in the multiple groups of conductive elements 1211, the following operations are performed in sequence:

[0152] Drive electrical signals are sequentially applied to the mutual capacitors formed by two conductive elements 1211 with a predetermined conductive element interval, and the mutual capacitance is measured. If the mutual capacitance changes, a mutual capacitance change signal is generated.

[0153] Figure 7 It is a schematic structural diagram of the strain sensing part of the battery safety detection device according to another embodiment of the present disclosure. Figure 8 It is a schematic structural diagram of one of the strain sensing devices of the strain sensing part of the battery safety detection device according to another embodiment of the present disclosure. Figure 9 It is a schematic structural diagram of the second strain sensing device of the strain sensing part of the battery safety detection device according to another embodiment of the present disclosure.

[0154] As Figures 7 to 9 As shown in the figure, the strain sensing part of the battery safety detection device 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 in the first direction (the horizontal direction shown in the figure), and the second strain sensing device 122 includes a plurality of second conductive strips 1221 arranged in the second direction (the vertical direction shown in the figure). Adjacent two first conductive strips 1211 are insulated from each other, and adjacent two second conductive strips 1221 are insulated from each other. The first direction is perpendicular to the second direction.

[0155] Among them, the strain electrical signal includes the mutual capacitance change signals 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.

[0156] As Figure 5As shown, according to another embodiment of the present disclosure, the strain sensing unit 12 includes a first strain sensing device and a second strain sensing device. The first strain sensing device includes a first rectangular conductive element array, and the first conductive elements in the first rectangular conductive element array are insulated from each other. The second strain sensing device includes a second rectangular conductive element array, and the second conductive elements in the second rectangular conductive element array are insulated from each other. The first conductive elements in the first rectangular conductive element array are disposed opposite to the second conductive elements in the second rectangular conductive element array.

[0157] Wherein, the strain electrical signal includes a mutual capacitance change signal between the first conductive element and the second conductive element which are relatively disposed between the first rectangular conductive element array and the second rectangular conductive element array.

[0158] Figures 7 to 9 The structural schematic diagram of the strain sensing device 121 according to another embodiment of the present disclosure is shown.

[0159] As Figures 7 to 9 shown, the two-dimensional array of the strain sensing device 121 of the strain sensing unit 12 of the battery safety detection device 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 are disposed within the same planar region;

[0160] The first sub-array includes a plurality of first series conductive element groups (V1, V2, V3, V4). The first series conductive element group includes a plurality of conductive elements connected in series along a first direction, and the plurality of first series conductive element groups are arranged along a second direction; the first series conductive element groups are insulated from each other;

[0161] The second sub-array includes a plurality of second series conductive element groups (H1, H2, H3, H4). The second series conductive element group includes a plurality of conductive elements connected in series along the second direction, and the plurality of second series conductive element groups are arranged along the first direction; the second series conductive element groups are insulated from each other;

[0162] The first sub-array is insulated from the second sub-array;

[0163] The first direction and the second direction are perpendicular to each other.

[0164] Those skilled in the art should understand that Figure 3 、 Figure 5 the strain sensing device 121 shown in Figures 7 to 9 can adopt the strain sensing device 121 shown in

[0165] Those skilled in the art should understand that Figures 7 to 9The number of the first series conductive element groups of the first sub-array and the number of the second series conductive element groups of the second sub-array shown are only exemplary.

[0166] For the battery safety detection device of this 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.

[0167] The conductive elements can adopt the diamond shape as shown in Figures 7 to 9 , or can adopt other shapes. The shape of the conductive elements shown in Figures 7 to 9 is only the preferred shape.

[0168] For the battery safety detection device of the above embodiment, preferably, a drive electrical 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, and 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. If the self-capacitance changes, a self-capacitance change signal is generated.

[0169] For the battery safety detection device of the above embodiment, preferably, based on the position information of at least one first series conductive element group with a changed self-capacitance in the first sub-array and the position information of at least one second series conductive element group with a changed self-capacitance in the second sub-array, the deformation position of the two-dimensional array is determined.

[0170] For the battery safety detection device of the above embodiment, preferably, a drive electrical 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, and the mutual capacitances of the mutual capacitors formed by each first series conductive element group of the first sub-array and each second series conductive element group of the second sub-array are simultaneously measured. If the mutual capacitance changes, a mutual-capacitance change signal is generated.

[0171] For the battery safety detection device of the above embodiment, preferably, based on the position information of the first series conductive element group of the mutual capacitor with a changed mutual capacitance in the first sub-array and the position information of the second series conductive element group in the second sub-array, the deformation position of the two-dimensional array is determined.

[0172] For the battery safety detection devices of the above respective embodiments, as shown in Figure 3 and Figure 5 , the strain sensing portion 12 further includes a first substrate layer 125 and a second substrate layer 126. 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.

[0173] Preferably, both the first substrate layer 125 and the second substrate layer 126 are made of insulating materials.

[0174] Preferably, both the first substrate layer 125 and the second substrate layer 126 are flexible substrates.

[0175] Preferably, the two strain sensing devices 121 are respectively disposed on the first substrate layer 125 and the second substrate layer 126.

[0176] According to the battery safety detection device of the preferred embodiment of the present disclosure, the strain sensing portion 12 further includes a support portion 124, and the support portion 124 is disposed between the first substrate layer 125 and the second substrate layer 126.

[0177] Preferably, the support portion 124 is disposed at the edge of the first substrate layer 125 and the second substrate layer 126.

[0178] Wherein, the support portion 124 includes a plurality of discrete support portions, or the support portion 124 is an integral structure.

[0179] The strain sensing portion 12 of the battery safety detection device of each of the above embodiments can be disposed between two adjacent batteries 11.

[0180] The strain sensing portion 12 of the battery safety detection device of each of the above embodiments can be disposed between the battery 11 and the housing 15, and the strain sensing portion 12 can also generate a strain electrical signal based on the deformation of the housing 15 of the battery device 10.

[0181] For the battery safety detection device of each of the above embodiments, preferably, as Figure 11 shown, the battery safety detection device further includes a drive detection portion 13, and the drive detection portion 13 applies a drive electrical signal to the strain sensing portion 12 and detects the strain electrical signal generated by the strain sensing portion 12.

[0182] Preferably, the drive detection portion 13 includes:

[0183] A drive circuit for providing a drive electrical signal to the strain sensing portion 12; a detection circuit for detecting the strain electrical signal; and a controller for controlling the drive circuit to provide a drive signal to the strain sensing portion 12 and processing the strain electrical signal obtained by the detection circuit to generate a processed strain electrical signal.

[0184] Preferably, the drive detection portion 13 further includes a memory for storing the strain electrical signal processed by the controller.

[0185] The following will Figures 15 to 25 describe in detail the detection circuit 132 of the battery safety detection device of the present disclosure.

[0186] A battery safety detection device according to an embodiment of the present disclosure, the detection circuit 132 includes a capacitance detection circuit, and the capacitance detection circuit detects the self-capacitance change signal of each conductive element and / or detects the mutual-capacitance change signal between two conductive elements.

[0187] According to an embodiment of the present disclosure, the capacitance detection circuit includes a charge signal conversion sub-circuit, and the charge signal conversion sub-circuit converts the self-capacitance accumulated charge of each conductive element into a voltage signal and / or converts the mutual-capacitance accumulated charge between two conductive elements into a voltage signal.

[0188] The capacitance detection circuit of the battery safety detection device in the above embodiment further includes a signal post-processing circuit, and 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.

[0189] A battery safety detection device according to an embodiment of the present disclosure, as Figures 16 to 18 shown, the charge signal conversion sub-circuit includes a first amplifier, and a drive signal (V Stim ) is applied to the self-capacitance (Cx) or the mutual-capacitance (Cx); the first amplifier converts the accumulated charge of the self-capacitance or the mutual-capacitance into a voltage signal Vout1.

[0190] Those skilled in the art should understand that Figures 16 to 18 the specific structure of the first amplifier in

[0191] is a preferred structure of the present disclosure, and those skilled in the art can make appropriate adjustments to the specific structure of the first amplifier under the inspiration of the present disclosure. Figure 18 shown, according to an 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.

[0192] Those skilled in the art should understand that Figure 18 the specific structure of the signal post-processing circuit in

[0193] is only exemplary.

[0194] As Figure 19 shown, preferably, the charge signal conversion sub-circuit includes a constant current source (I b) A first comparator, a second comparator, and a multiplexer. The constant current source is controlled to charge or discharge the self - capacitance (Cx) or the mutual capacitance (Cx). The 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), and the second comparator has a second threshold voltage (Vth2). The first comparator and the second comparator convert the triangular waveform voltage signals into square - wave electrical signals. The multiplexer adjusts the amplitude of the square - wave electrical signals. The frequency of the square - wave electrical signal output by the multiplexer is a function of the charging and discharging current of the self - capacitance or the mutual capacitance. Based on this, a capacitance change signal of the self - capacitance or the mutual capacitance can be generated.

[0195] According to another embodiment of the present disclosure, the capacitance detection circuit includes a charge signal conversion sub - circuit. The charge signal conversion sub - circuit converts the accumulated charge of the self - capacitance of each conductive element into a pulse - width signal, and / or converts the accumulated charge of the mutual capacitance between two conductive elements into a pulse - width signal.

[0196] As Figure 20 shown, preferably, the charge signal conversion sub - circuit includes a constant current source (I b ), a transconductance amplifier (Gm), and a comparator. The constant current source is controlled to charge or discharge the self - capacitance (Cx) or the mutual capacitance (Cx). The self - capacitance or the mutual capacitance is connected across the input terminal and the output terminal of the transconductance amplifier. 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. When the triangular waveform voltage signal is greater than the threshold voltage signal, the comparator outputs a high level.

[0197] According to another embodiment of the present disclosure, the capacitance detection circuit includes a charge signal conversion sub - circuit. The charge signal conversion sub - circuit converts the accumulated charge of the self - capacitance of each conductive element into a digital signal, and / or converts the accumulated charge of the mutual capacitance between two conductive elements into a digital signal.

[0198] Preferably, the charge signal conversion sub - circuit includes an integrator and a comparator. The integrator is controlled to accumulate the accumulated charge of the mutual capacitance or the self - capacitance and convert it into a voltage signal, and the integrator is controlled to accumulate the accumulated charge of the capacitance difference between the self - capacitance or the mutual capacitance and a reference capacitance and convert it into a voltage signal. Based on the positive or negative of the voltage signal, the comparator outputs a high level or a low level.

[0199] Preferably, as Figures 21 to 22 shown, an amplifier having C int in its feedback loop is used as an integrator. Assume that the output voltage of the integrator is negative at the beginning of the measurement. Therefore, the output (D) of the comparator is zero, as Figure 21 and Figure 22As shown, when D is zero, the two control signals φ1 and φ2 are low. When the clock CK is high, C x is charged by V ref . In the second phase (CK is low), the charge quantity V ref C x is transferred to the integrating capacitor C int . As long as the output V ref C x / C int of the integrator is negative, the comparator output is zero. When the output V ref C x / C int of the integrator is positive, the charge quantity (C x -C ref )V ref is transferred to the integrating capacitor C int . Therefore, in the first time period (when D is 1), (C x -C ref )V ref / C int is applied to the output of the integrator. In the second time period (when D is 0), V ref C x / C int is applied to the output of the integrator. The proportion of the first time period in the sum of the first time period and the second time period is equal to the ratio of C x to C ref .

[0200] According to another embodiment of the present disclosure, a battery safety detection device, the capacitance detection circuit includes a charge signal conversion sub-circuit and a signal amplification sub-circuit. The charge signal conversion sub-circuit converts the self-capacitance accumulated charge of each conductive element into a voltage signal, and / or converts the mutual-capacitance accumulated charge between two conductive elements into a voltage signal. The signal amplification sub-circuit amplifies the voltage signal to generate an amplified voltage signal.

[0201] As Figure 23 shown, preferably, the capacitance detection circuit further includes a signal post-processing sub-circuit, and the signal post-processing sub-circuit includes at least a filter and an analog-to-digital converter.

[0202] According to another embodiment of the present disclosure, as Figure 24 shown, the charge signal conversion sub-circuit includes a reference capacitor (C ref ), a first amplifier (OP1) and a second amplifier (OP2). The first amplifier converts the accumulated charge of the self-capacitance (C x ) or the mutual-capacitance (C x ) into a first voltage signal, and the second amplifier converts the accumulated charge of the reference capacitor (C ref ) into a second voltage signal.

[0203] Preferably, in the above embodiments, as Figure 24 shown, the signal amplification sub-circuit includes a common-mode amplifier (CM1), and the common-mode amplifier amplifies the difference between the first voltage signal and the second voltage signal and then outputs it.

[0204] According to another embodiment of the present disclosure, as Figure 25 shown, the charge signal conversion sub-circuit includes a reference capacitor (C ref ), a first amplifier, a second amplifier, and a rectifier & filter. The first amplifier converts the accumulated charge from the self-capacitance (C x ) or the mutual capacitance (C x ) into a first voltage signal, and the second amplifier converts the accumulated charge of the reference capacitor (C ref ) into a second voltage signal. The rectifier & filter rectifies and filters the first voltage signal and the second voltage signal respectively and then outputs them.

[0205] Preferably, as Figure 25 shown, the signal amplification sub-circuit includes an instrumentation amplifier, and the instrumentation amplifier amplifies the difference between the first voltage signal and the second voltage signal and then outputs it.

[0206] The present disclosure also provides a battery management system, including the battery safety detection device of any one of the above embodiments. Figure 26 Shows the battery management system, where the above-described drive detection unit 13 can be integrated into the chip and connected to the pin strain sensing part of the chip.

[0207] In the description of this specification, the description with reference to terms such as "one embodiment / way", "some embodiments / ways", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment / way or example are included in at least one embodiment / way or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment / way or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments / ways or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments / ways or examples described in this specification and the features of different embodiments / ways or examples.

[0208] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of this application, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0209] Those skilled in the art should understand that the above-described embodiments are merely for clearly illustrating the present disclosure and are not intended to limit the scope of the present disclosure. For those skilled in the art, other changes or modifications can be made based on the above disclosure, and these changes or modifications are still within the scope of the present disclosure.

Claims

1. A battery safety detection device, characterized in that, it includes: at least one strain sensing part, the at least one strain sensing part is arranged on at least one surface of the battery of the battery device, the strain sensing part can at least generate a strain electrical signal based on the deformation of the battery of the battery device, and the strain electrical signal at least indicates the occurrence of the deformation. Wherein, the strain sensing part includes at least one strain sensing device, the strain sensing device includes a plurality of conductive elements, the plurality of conductive elements are located in the same plane and are uniformly arranged in a two-dimensional array, and each conductive element is insulated from other conductive elements; the strain sensing device can respond to the deformation of the battery to cause the position corresponding to the deformation of the battery in the two-dimensional array to deform, and the strain sensing part generates the strain electrical signal based on the deformation of the two-dimensional array; the strain electrical signal includes the change signal of the self-capacitance of any one conductive element in the two-dimensional array and the change signal of the mutual capacitance between any other conductive element, and the self-capacitance is the capacitance between any one conductive element and the ground; and a driving and detecting part, the driving and detecting part applies a driving electrical signal to the strain sensing part and detects the strain electrical signal generated by the strain sensing part, including a detecting circuit for detecting the strain electrical signal, the detecting circuit includes a capacitance detecting circuit, the capacitance detecting circuit detects the change signal of the self-capacitance and the change signal of the mutual capacitance, and the capacitance detecting circuit includes a charge signal conversion sub-circuit, and the charge signal conversion sub-circuit converts the accumulated charge of the self-capacitance and the accumulated charge of the mutual capacitance into one of a voltage signal, a pulse width signal, a digital signal and a frequency signal.

2. The battery safety detection device according to claim 1, characterized in that, the two-dimensional array includes a plurality of conductive elements arranged along a first direction and a plurality of conductive elements arranged along a second direction, and the first direction is perpendicular to the second direction.

3. The battery safety detection device according to claim 1, characterized in that, the strain sensing part includes two strain sensing devices, the two strain sensing devices are arranged opposite to each other, and an insulating gap is arranged between the two strain sensing devices.

4. The battery safety detection device according to claim 3, characterized in that, the strain sensing part includes a first strain sensing device and a second strain sensing device, the conductive element is a conductive strip, 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, adjacent two first conductive strips are insulated from each other, adjacent two second conductive strips are insulated from each other, and the first direction is perpendicular to the second direction.

5. The battery safety detection device according to claim 4, characterized in that, the strain electrical signal includes the change signal of the mutual capacitance between each first conductive strip of the first strain sensing device and each second conductive strip of the second strain sensing device.

6. The battery safety detection device according to claim 3, characterized in that, 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, and the first conductive elements of the first rectangular conductive element array are insulated from each other. The second strain sensing device includes a second rectangular conductive element array, and the second conductive elements of the second rectangular conductive element array are insulated from each other. The first conductive elements of the first rectangular conductive element array are arranged opposite to the second conductive elements of the second rectangular conductive element array.

7. The battery safety detection device according to claim 6, wherein, the strain electrical signal includes a change signal of the mutual capacitance between the first conductive element and the second conductive element which are arranged opposite to each other in the first rectangular conductive element array and the second rectangular conductive element array.

8. The battery safety detection device according to claim 3, wherein, the insulation gap is filled with a flexible insulating material.

9. The battery safety detection device according to claim 1, wherein, a driving electrical signal is simultaneously applied to all the conductive elements of the strain sensing device, and the self-capacitance of each conductive element is simultaneously measured. If the self-capacitance of the conductive element changes, a change signal of the self-capacitance is generated.

10. The battery safety detection device according to claim 1, wherein, a driving electrical signal is sequentially applied to each of the conductive elements of all the conductive elements of the strain sensing device, and the self-capacitance of each conductive element is sequentially measured. If the self-capacitance of the conductive element changes, a change signal of the self-capacitance is generated.

11. The battery safety detection device according to claim 9, wherein, the degree of deformation is judged based on the magnitude of the change signal of the self-capacitance, and the deformation position is judged based on the position of the conductive element whose self-capacitance changes in the two-dimensional array.

12. The battery safety detection device according to claim 2, wherein, for the conductive elements arranged along the first direction of the two-dimensional array, they are divided into multiple groups along the second direction. For each group of the multiple groups of conductive elements, the following operations are simultaneously performed: A driving electrical signal is sequentially applied to the mutual capacitors formed by any two conductive elements, and the mutual capacitance is measured. If the mutual capacitance changes, a change signal of the mutual capacitance is generated.

13. The battery safety detection device according to claim 2, wherein, for the conductive elements arranged along the second direction of the two-dimensional array, they are divided into multiple groups along the first direction. For each group of the multiple groups of conductive elements, the following operations are simultaneously performed: A driving electrical signal is sequentially applied to the mutual capacitors formed by any two conductive elements, and the mutual capacitance is measured. If the mutual capacitance changes, a change signal of the mutual capacitance is generated.

14. The battery safety detection device according to claim 2, wherein, for the conductive elements arranged along the first direction of the two-dimensional array, they are divided into multiple groups along the second direction. For each group of the multiple groups of conductive elements, the following operations are sequentially performed: A driving electrical signal is sequentially applied to the mutual capacitors formed by any two conductive elements, and the mutual capacitance is measured. If the mutual capacitance changes, a change signal of the mutual capacitance is generated.

15. The battery safety detection device according to claim 2, characterized in that for the conductive elements arranged in the second direction of the two-dimensional array, they are divided into multiple groups along the first direction, and the following operations are sequentially performed on each group of conductive elements in the multiple groups of conductive elements: A driving electrical signal is sequentially applied to the mutual capacitors formed by any two conductive elements, and the mutual capacitance is measured. If the mutual capacitance changes, a change signal of the mutual capacitance is generated.

16. The battery safety detection device according to claim 1, characterized in that 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 arranged within the same planar region; the first sub-array includes multiple first series conductive element groups, the first series conductive element groups include multiple conductive elements connected in series along the first direction, and the multiple first series conductive element groups are arranged along the second direction; insulation is provided between each of the first series conductive element groups; the second sub-array includes multiple second series conductive element groups, the second series conductive element groups include multiple conductive elements connected in series along the second direction, and the multiple second series conductive element groups are arranged along the first direction; insulation is provided between each of the second series conductive element groups; insulation is provided between the first sub-array and the second sub-array; the first direction and the second direction are perpendicular to each other.

17. The battery safety detection device according to claim 16, characterized in that the shapes of the conductive elements of the first sub-array are the same as the shapes of the conductive elements of the second sub-array.

18. The battery safety detection device according to claim 16, characterized in that A driving electrical 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, and 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. If the self-capacitance changes, a change signal of the self-capacitance is generated.

19. The battery safety detection device according to claim 18, characterized in that Based on the position information of at least one first series conductive element group with a changed self-capacitance in the first sub-array and the position information of at least one second series conductive element group with a changed self-capacitance in the second sub-array, the deformation position of the two-dimensional array is determined.

20. The battery safety detection device according to claim 16, characterized in that A driving electrical 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, and the mutual capacitances of the mutual capacitors formed by each first series conductive element group of the first sub-array and each second series conductive element group of the second sub-array are simultaneously measured. If the mutual capacitance changes, a change signal of the mutual capacitance is generated.

21. The battery safety detection device according to claim 15, characterized in that based on the position information of the first series of conductive element groups of the mutual capacitors with changed mutual capacitance in the first sub-array and the position information of the second series of conductive element groups in the second sub-array, the deformation position of the two-dimensional array is determined.

22. The battery safety detection device according to claim 1, 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 the first substrate layer and the second substrate layer and is held by the first substrate layer and the second substrate layer.

23. The battery safety detection device according to claim 22, characterized in that both the first substrate layer and the second substrate layer are insulating materials.

24. The battery safety detection device according to claim 23, characterized in that both the first substrate layer and the second substrate layer are flexible substrates.

25. The battery safety detection device according to claim 3, characterized in that 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.

26. The battery safety detection device according to claim 25, characterized in that the strain sensing part further includes a support part, and the support part is disposed between the first substrate layer and the second substrate layer.

27. The battery safety detection device according to claim 26, characterized in that the support part is disposed at the edge of the first substrate layer and the second substrate layer.

28. The battery safety detection device according to claim 26, characterized in that the support part includes a plurality of discrete support parts, or the support part is an integral structure.

29. The battery safety detection device according to claim 25, characterized in that both the first substrate layer and the second substrate layer are insulating materials.

30. The battery safety detection device according to claim 25, characterized in that both the first substrate layer and the second substrate layer are flexible materials.

31. The battery safety detection device according to claim 1, characterized in that the strain sensing part can be disposed between two adjacent batteries.

32. The battery safety detection device according to claim 1, characterized in that the strain sensing part can be disposed between the battery and the housing.

33. The battery safety detection device according to claim 1, characterized in that the strain sensing part can also generate the strain electrical signal based on the deformation of the housing of the battery device.

34. The battery safety detection device according to claim 4, characterized in that the driving and detecting part further includes: a driving circuit for providing a driving electrical signal to the strain sensing part; a controller for controlling the driving circuit to provide a driving signal to the strain sensing part and processing the strain electrical signal obtained by the detecting circuit to generate a processed strain electrical signal.

35. The battery safety detection device according to claim 34, It is characterized in that the driving detection unit further includes a memory, and the memory stores the strain electrical signals processed by the controller.

36. The battery safety detection device according to claim 35, It is characterized in that the charge signal conversion sub-circuit converts the accumulated charges of the self-capacitances of the respective conductive elements into voltage signals, and converts the accumulated charges of the mutual capacitances between two conductive elements into voltage signals. The capacitance detection circuit further includes a signal post-processing circuit, and the signal post-processing circuit performs post-processing on the voltage signals output by the charge signal conversion sub-circuit. The post-processing includes filtering processing and analog-to-digital conversion processing.

37. The battery safety detection device according to claim 35, It is characterized in that the charge signal conversion sub-circuit includes a first amplifier; a driving 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 voltage signals.

38. The battery safety detection device according to claim 36, It is characterized in that the signal post-processing circuit further includes a demodulator, an oscillator, an accumulator, and a register.

39. The battery safety detection device according to claim 35, It is characterized in that the charge signal conversion sub-circuit converts the accumulated charges of the self-capacitance into frequency signals, and converts the accumulated charges of the mutual capacitance into frequency signals. 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. The triangular waveform voltage signals generated by the charge and discharge 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, and the second comparator has a second threshold voltage. The first comparator and the second comparator convert the triangular waveform voltage signals into square-wave electrical signals. The multiplexer adjusts the amplitude of the square-wave electrical signals. The frequency of the square-wave electrical signals output by the multiplexer is a function of the charge and discharge currents of the self-capacitance or the mutual capacitance.

40. The battery safety detection device according to claim 35, It is characterized in that the charge signal conversion sub-circuit converts the accumulated charges of the self-capacitance into pulse width signals, and converts the accumulated charges of the mutual capacitance into pulse width signals. 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 the input terminal and the output terminal of the transconductance amplifier. 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. When the triangular waveform voltage signal is greater than the threshold voltage signal, the comparator outputs a high level.

41. The battery safety detection device according to claim 35, It is characterized in that The charge signal conversion sub-circuit converts the accumulated charge of the self-capacitance into a digital signal and converts the accumulated charge of the mutual capacitance into a digital signal. The charge signal conversion sub-circuit includes an integrator and a comparator. The integrator is controlled to accumulate the accumulated charge of the mutual capacitance or the self-capacitance and convert it into a voltage signal, and the integrator is controlled to accumulate the accumulated charge of the capacitance difference between the self-capacitance or the mutual capacitance and the reference capacitance and convert it into a voltage signal. Based on the positive or negative of the voltage signal, the comparator outputs a high level or a low level.

42. The battery safety detection device according to claim 35, wherein, the capacitance detection circuit further includes a signal amplification sub-circuit. The charge signal conversion sub-circuit converts the accumulated charge of the self-capacitance into a voltage signal and converts the accumulated charge of the mutual capacitance into a voltage signal. The signal amplification sub-circuit amplifies the voltage signal to generate an amplified voltage signal.

43. The battery safety detection device according to claim 42, wherein, the capacitance detection circuit further includes a signal post-processing sub-circuit. The signal post-processing sub-circuit at least includes a filter and an analog-to-digital converter.

44. The battery safety detection device according to claim 42, wherein, the charge signal conversion sub-circuit includes a reference capacitance, a first amplifier, and a second amplifier. The first amplifier converts the accumulated charge of the self-capacitance or the mutual capacitance into a first voltage signal, and the second amplifier converts the accumulated charge of the reference capacitance into a second voltage signal.

45. The battery safety detection device according to claim 44, wherein, the signal amplification sub-circuit includes a common-mode amplifier. The common-mode amplifier amplifies the difference between the first voltage signal and the second voltage signal and then outputs it.

46. The battery safety detection device according to claim 42, wherein, the charge signal conversion sub-circuit includes a reference capacitance, a first amplifier, a second amplifier, and a rectifier & filter. The first amplifier converts the accumulated charge of the self-capacitance or the mutual capacitance into a first voltage signal, the second amplifier converts the accumulated charge of the reference capacitance into a second voltage signal, and the rectifier & filter rectifies and filters the first voltage signal and the second voltage signal respectively and then outputs them.

47. The battery safety detection device according to claim 46, wherein, the signal amplification sub-circuit includes an instrumentation amplifier. The instrumentation amplifier amplifies the difference between the first voltage signal and the second voltage signal and then outputs it.

48. A battery management system, wherein, comprises: the battery safety detection device according to any one of claims 1 to 47.

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