Battery safety detection device and battery management system

Abstract

The present disclosure provides a battery safety detection device, including: at least one sensing part disposed on a battery of a battery device, and the sensing part is capable of generating a signal. 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 the battery ages. 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] In order 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 first conductive layer and a second conductive layer, there is a preset distance between the first conductive layer and the second conductive layer, and the first conductive layer or the second conductive layer can respond to the deformation of the battery so that the preset distance between the position of the first conductive layer corresponding to the deformation and the position of the second conductive layer corresponding to the deformation changes, and generate the strain electrical signal based on the change of the preset distance.

[0008] For the battery safety detection device according to at least one embodiment of the present disclosure, a first driving voltage is applied to both ends of the first conductive layer, and current sensing is performed on both ends of the first conductive layer, and based on the change of the sensed current, the change of the preset distance between the first conductive layer and the second conductive layer is judged;

[0009] Alternatively, a second driving voltage is applied to both ends of the second conductive layer, and current sensing is performed on both ends of the second conductive layer, and based on the change of the sensed current, the change of the preset distance between the first conductive layer and the second conductive layer is judged;

[0010] Alternatively, a first driving voltage is applied to both ends of the first conductive layer, and current sensing is performed on both ends of the first conductive layer. A second driving voltage is applied to both ends of the second conductive layer, and current sensing is performed on both ends of the second conductive layer. Based on the change in the current at both ends of the first conductive layer and the change in the current at both ends of the second conductive layer, a change in the preset distance between the first conductive layer and the second conductive layer is determined;

[0011] The strain electrical signal includes the change in the current.

[0012] The battery safety detection device according to at least one embodiment of the present disclosure further includes a signal detection unit, and the signal detection unit detects the strain electrical signal generated by the strain sensing unit.

[0013] The battery safety detection device according to at least one embodiment of the present disclosure applies a first driving current to both ends of the first conductive layer, and voltage sensing is performed on both ends of the first conductive layer. Based on the change in the sensed voltage, a change in the preset distance between the first conductive layer and the second conductive layer is determined;

[0014] Alternatively, a second driving current is applied to both ends of the second conductive layer, and voltage sensing is performed on both ends of the second conductive layer. Based on the change in the sensed voltage, a change in the preset distance between the first conductive layer and the second conductive layer is determined;

[0015] Alternatively, a first driving current is applied to both ends of the first conductive layer, and voltage sensing is performed on both ends of the first conductive layer. A second driving current is applied to both ends of the second conductive layer, and voltage sensing is performed on both ends of the second conductive layer. Based on the change in the voltage at both ends of the first conductive layer and the change in the voltage at both ends of the second conductive layer, a change in the preset distance between the first conductive layer and the second conductive layer is determined;

[0016] The strain electrical signal includes the change in the voltage.

[0017] The battery safety detection device according to at least one embodiment of the present disclosure further includes a signal detection unit, and the signal detection unit detects the strain electrical signal generated by the strain sensing unit.

[0018] The battery safety detection device according to at least one embodiment of the present disclosure further includes a signal detection unit, and the signal detection unit measures the mutual capacitance formed by the first conductive layer and the second conductive layer. Based on the change in the mutual capacitance, a change in the preset distance is determined; the strain electrical signal includes the change in the mutual capacitance.

[0019] The battery safety detection device according to at least one embodiment of the present disclosure further includes a signal detection unit that detects the strain electrical signal generated by the strain sensing unit.

[0020] The battery safety detection device according to at least one embodiment of the present disclosure applies a first driving voltage to both ends of the first conductive layer, senses the voltage of the second conductive layer, and determines whether the first conductive layer and the second conductive layer are in contact based on whether a sensed voltage is generated.

[0021] The battery safety detection device according to at least one embodiment of the present disclosure applies a second driving voltage to both ends of the second conductive layer, senses the voltage of the first conductive layer, and determines whether the first conductive layer and the second conductive layer are in contact based on whether a sensed voltage is generated.

[0022] The battery safety detection device according to at least one embodiment of the present disclosure alternately applies a driving voltage to both ends of the first conductive layer and both ends of the second conductive layer. When applying a driving voltage to both ends of the first conductive layer, it senses the voltage of the second conductive layer. When applying a driving voltage to both ends of the second conductive layer, it senses the voltage of the first conductive layer.

[0023] Determine the contact position of the first conductive layer and the second conductive layer at least based on the magnitude of the sensed voltage generated when sensing the voltage of the first conductive layer and the magnitude of the sensed voltage generated when sensing the voltage of the second conductive layer.

[0024] For the battery safety detection device according to at least one embodiment of the present disclosure, both ends of the first conductive layer to which the driving voltage is applied are the two ends in the first direction, and both ends of the second conductive layer to which the driving voltage is applied are the two ends in the second direction, and the first direction is perpendicular to the second direction.

[0025] For the battery safety detection device according to at least one embodiment of the present disclosure, the first conductive layer includes a plurality of first conductive strips arranged in the first direction, and adjacent two first conductive strips are insulated from each other. The second conductive layer includes a plurality of second conductive strips arranged in the second direction, and adjacent two second conductive strips are insulated from each other. The first direction is perpendicular to the second direction.

[0026] A battery safety detection device according to at least one embodiment of the present disclosure applies a second driving voltage to both ends of all the second conductive bars of the second conductive layer, and performs voltage sensing on all the first conductive bars of the first conductive layer, and determines whether the first conductive layer and the second conductive layer are in contact based on whether a sensing voltage is generated, and determines the contact position between the first conductive layer and the second conductive layer based on the position of at least one first conductive bar that generates the sensing voltage in the first conductive layer.

[0027] A battery safety detection device according to at least one embodiment of the present disclosure applies a first driving voltage to both ends of all the first conductive bars of the first conductive layer, and performs voltage sensing on all the second conductive bars of the second conductive layer, and determines whether the first conductive layer and the second conductive layer are in contact based on whether a sensing voltage is generated, and determines the contact position between the first conductive layer and the second conductive layer based on the position of at least one second conductive bar that generates the sensing voltage in the second conductive layer.

[0028] A battery safety detection device according to at least one embodiment of the present disclosure alternately applies a driving voltage to both ends of all the first conductive bars of the first conductive layer and both ends of all the second conductive bars of the second conductive layer;

[0029] When a driving voltage is applied to both ends of all the first conductive bars of the first conductive layer, voltage sensing is performed on all the second conductive bars of the second conductive layer, and when a driving voltage is applied to both ends of all the second conductive bars of the second conductive layer, voltage sensing is performed on all the first conductive bars of the first conductive layer;

[0030] At least based on the position of at least one second conductive bar that generates the sensing voltage in the second conductive layer and the position of at least one first conductive bar that generates the sensing voltage in the first conductive layer, at least one contact position between the first conductive layer and the second conductive layer is obtained.

[0031] A battery safety detection device according to at least one embodiment of the present disclosure further includes a signal detection unit, and the signal detection unit measures the mutual capacitance formed between each first conductive bar and each second conductive bar, and determines the position where the preset distance between the first conductive layer and the second conductive layer changes based on the change of at least one mutual capacitance, so as to determine at least one deformation position of the battery.

[0032] A battery safety detection device according to at least one embodiment of the present disclosure, the first conductive layer 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 conductive layer 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 disposed opposite to the second conductive elements of the second rectangular conductive element array.

[0033] A battery safety detection device according to at least one embodiment of the present disclosure applies a second driving voltage to all the second conductive elements of the second conductive layer, and performs voltage sensing on all the first conductive elements of the first conductive layer. Based on whether a sensing voltage is generated, it is determined whether the first conductive layer and the second conductive layer are in contact, and based on the position of at least one first conductive element that generates the sensing voltage in the first conductive layer, the contact position between the first conductive layer and the second conductive layer is determined.

[0034] A battery safety detection device according to at least one embodiment of the present disclosure applies a first driving voltage to all the first conductive elements of the first conductive layer, and performs voltage sensing on all the second conductive elements of the second conductive layer. Based on whether a sensing voltage is generated, it is determined whether the first conductive layer and the second conductive layer are in contact, and based on the position of at least one second conductive element that generates the sensing voltage in the second conductive layer, the contact position between the first conductive layer and the second conductive layer is determined.

[0035] A battery safety detection device according to at least one embodiment of the present disclosure alternately applies a driving voltage to all the first conductive elements of the first conductive layer and all the second conductive elements of the second conductive layer;

[0036] When applying a driving voltage to all the first conductive elements of the first conductive layer, voltage sensing is performed on all the second conductive elements of the second conductive layer. When applying a driving voltage to all the second conductive elements of the second conductive layer, voltage sensing is performed on all the first conductive elements of the first conductive layer;

[0037] At least based on the position of at least one second conductive element that generates the sensing voltage in the second conductive layer and the position of at least one first conductive element that generates the sensing voltage in the first conductive layer, at least one contact position between the first conductive layer and the second conductive layer is obtained.

[0038] The battery safety detection device according to at least one embodiment of the present disclosure further includes a signal detection unit. The signal detection unit measures the mutual capacitance formed by the first conductive element and the second conductive element of the relatively arranged first rectangular conductive element array and the second rectangular conductive element array, and determines the position where the preset distance between the first conductive layer and the second conductive layer changes based on the change of at least one mutual capacitance, so as to determine at least one deformation position of the battery.

[0039] For the battery safety detection device according to at least one embodiment of the present disclosure, the first conductive layer is disposed on a first substrate, and the second conductive layer is disposed on a second substrate.

[0040] For the battery safety detection device according to at least one embodiment of the present disclosure, both the first substrate and the second substrate are insulating substrates.

[0041] For the battery safety detection device according to at least one embodiment of the present disclosure, both the first substrate and the second substrate are flexible substrates.

[0042] For the battery safety detection device according to at least one embodiment of the present disclosure, the preset distance is formed by a support portion, and the support portion is disposed between the first conductive layer and the second conductive layer.

[0043] For the battery safety detection device according to at least one embodiment of the present disclosure, the preset distance is formed by a support portion, and the support portion is disposed between the first substrate and the second substrate.

[0044] 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 conductive layer and the second conductive layer.

[0045] 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 and the second substrate.

[0046] 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.

[0047] 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.

[0048] For the battery safety detection device according to at least one embodiment of the present disclosure, the strain sensing portion can be disposed between the battery and the housing.

[0049] According to the battery safety detection device of at least one embodiment of the present disclosure, the strain sensing part can also generate the strain electrical signal based on the deformation of the housing of the battery device.

[0050] According to the battery safety detection device of at least one embodiment of the present disclosure, the signal detection part includes:

[0051] A drive circuit for providing a drive signal to the strain sensing part; a detection circuit for detecting the strain electrical signal; and

[0052] A controller for controlling the drive circuit to provide a drive signal to the strain sensing part and processing the strain electrical signal obtained by the detection circuit to generate a processed strain electrical signal.

[0053] According to the battery safety detection device of at least one embodiment of the present disclosure, the signal detection part further includes a memory for storing the strain electrical signal processed by the controller.

[0054] According to the battery safety detection device of at least one embodiment of the present disclosure, the drive circuit includes:

[0055] A digital-to-analog converter for converting the digital drive signal received from the controller into an analog drive signal;

[0056] An amplifier for amplifying the analog drive signal to generate an amplified drive signal; and

[0057] A multiplexer including a plurality of signal channels, and the amplified drive signal is applied to one or more of the plurality of signal channels to the strain sensing part.

[0058] According to the battery safety detection device of at least one embodiment of the present disclosure, the amplified drive signal is applied to one first conductive strip or a plurality of first conductive strips of the first conductive layer of the strain sensing part through one or more of the plurality of signal channels;

[0059] Alternatively, the amplified drive signal is applied to one second conductive strip or a plurality of second conductive strips of the second conductive layer of the strain sensing part through one or more of the plurality of signal channels.

[0060] According to the battery safety detection device of at least one embodiment of the present disclosure, the drive circuit includes:

[0061] A digital-to-analog converter for converting the digital drive signal received from the controller into an analog drive signal;

[0062] A multiplexer, the multiplexer including a plurality of signal channels, and the analog drive signal being output via one or more of the plurality of signal channels; and

[0063] A plurality of amplifiers, each amplifier amplifying the analog drive signal output via a signal channel of the multiplexer, and the amplified analog drive signal being applied to the strain sensing portion.

[0064] For a battery safety detection device according to at least one embodiment of the present disclosure, the analog drive signal output via one signal channel or a plurality of signal channels among the plurality of signal channels is amplified and then applied to one first conductive strip or a plurality of first conductive strips of the first conductive layer of the strain sensing portion;

[0065] Alternatively, the analog drive signal output via one signal channel or a plurality of signal channels among the plurality of signal channels is amplified and then applied to one second conductive strip or a plurality of second conductive strips of the second conductive layer of the strain sensing portion.

[0066] For a battery safety detection device according to at least one embodiment of the present disclosure, the detection circuit includes:

[0067] A sense amplifier, the sense amplifier sensing the induced charge of the first conductive layer or the second conductive layer of the strain sensing portion and converting it into an amplified induced voltage; and

[0068] An analog-to-digital converter, the analog-to-digital converter performing analog-to-digital conversion on the amplified induced voltage, generating a digital induced voltage and outputting it to the controller, and the digital induced voltage indicating a change in the mutual capacitance between the first conductive layer and the second conductive layer.

[0069] For a battery safety detection device according to at least one embodiment of the present disclosure, it further includes a filter, and the filter is arranged between the sense amplifier and the analog-to-digital converter.

[0070] For a battery safety detection device according to at least one embodiment of the present disclosure, the detection circuit includes:

[0071] A differential amplifier, the differential amplifier amplifying the sensed voltage of the first conductive layer or the second conductive layer of the strain sensing portion to generate an amplified sensed voltage; and

[0072] An analog-to-digital converter, the analog-to-digital converter converting the amplified sensed voltage into a digital signal and outputting it to the controller.

[0073] According to at least one embodiment of the present disclosure, in the battery safety detection device, the detection circuit further includes a differential anti-aliasing filter, and the differential anti-aliasing filter is disposed between the differential amplifier and the analog-to-digital converter.

[0074] According to another aspect of the present disclosure, there is provided a battery safety detection device, including:

[0075] At least one strain sensing part, which is disposed on at least one surface of the battery of the battery device, and the strain sensing part is at least capable of generating 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;

[0076] Wherein, the strain sensing part includes at least one strain sensing device, and the strain sensing device includes a first conductive layer and a second conductive layer, and there is a preset distance between the first conductive layer and the second conductive layer, and the first conductive layer or the second conductive layer can respond to the deformation of the battery to cause the position of the first conductive layer corresponding to the deformation of the battery to deform or the position of the second conductive layer 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 first conductive layer or the deformation of the second conductive layer.

[0077] According to still 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

[0078] 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.

[0079] Figure 1 It is a schematic structural diagram of a battery device provided with a battery safety detection device according to an embodiment of the present disclosure.

[0080] Figure 2 It is a schematic structural diagram of a battery device provided with a battery safety detection device according to still another embodiment of the present disclosure.

[0081] Figure 3 It is a schematic structural diagram of a strain sensing part of a battery safety detection device according to an embodiment of the present disclosure.

[0082] Figure 4 It is a schematic structural diagram of a strain sensing part of a battery safety detection device according to still another embodiment of the present disclosure.

[0083] Figure 5Schematic diagram of the strain sensing part of the battery safety detection device according to another embodiment of the present disclosure.

[0084] Figure 6 Schematic diagram of the first conductive layer of the strain sensing part of the battery safety detection device according to an embodiment of the present disclosure.

[0085] Figure 7 Schematic diagram of the second conductive layer of the strain sensing part of the battery safety detection device according to an embodiment of the present disclosure.

[0086] Figure 8 Schematic diagram of the first conductive layer of the strain sensing part of the battery safety detection device according to another embodiment of the present disclosure.

[0087] Figure 9 Schematic diagram of the second conductive layer of the strain sensing part of the battery safety detection device according to another embodiment of the present disclosure.

[0088] Figure 10 Schematic diagram of the signal detection part of the battery safety detection device according to an embodiment of the present disclosure.

[0089] Figure 11 Schematic diagram of the driving circuit of the signal detection part according to an embodiment of the present disclosure.

[0090] Figure 12 Schematic diagram of the driving circuit of the signal detection part according to another embodiment of the present disclosure.

[0091] Figure 13 Schematic diagram of the detection circuit of the signal detection part according to an embodiment of the present disclosure.

[0092] Figure 14 Schematic diagram of the detection circuit of the signal detection part according to another embodiment of the present disclosure.

[0093] Figure 15 Schematic diagram of the detection circuit of the signal detection part according to another embodiment of the present disclosure.

[0094] Figure 16 Schematic diagram of the detection circuit of the signal detection part according to another embodiment of the present disclosure.

[0095] Figure 17 Schematic diagram of the battery detection system according to an embodiment of the present disclosure. Detailed implementation manners

[0096] 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 embodiments described herein are only used to explain the relevant content and do not limit the present disclosure. Additionally, it should be noted that for ease of description, only parts related to the present disclosure are shown in the drawings.

[0097] 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.

[0098] Unless otherwise specified, the exemplary embodiments / examples shown will be 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.

[0099] 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 material, material properties, dimensions, proportions, commonality 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 components may be exaggerated. When the exemplary embodiments can be implemented differently, the specific process sequences can be performed in an order different from that described. For example, two consecutively described processes can be performed substantially simultaneously or in an order opposite to that described. Moreover, the same reference numerals denote the same components.

[0100] 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 an intermediate component. However, when the component is referred to as being "directly on" another component, "directly connected to" or "directly coupled to" another component, there is no intermediate component. For this reason, the term "connection" can refer to a physical connection, an electrical connection, etc., and can have or not have an intermediate component.

[0101] For descriptive purposes, the present disclosure may use spatial relative terms such as "under", "below", "beneath", "lower", "above", "upper", "on", "higher", and "side (e.g., as in "sidewall")" to describe the relationship of one component to another (other) component as shown in the figures. In addition to the orientation depicted in the figures, the spatial relative terms are also intended to encompass different orientations of the device during use, operation, and / or manufacturing. For example, if the device in the figures 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 "below" orientations. Additionally, the device may be otherwise positioned (e.g., rotated 90 degrees or at other orientations), and accordingly, the spatial relative descriptors used herein are to be interpreted.

[0102] 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. Additionally, when the terms "comprises" and / or "comprising" and their variations are used in this specification, it is stated that there are the stated features, integers, steps, operations, components, assemblies, and / or groups thereof, but do 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 terms of degree, and thus are used to explain the inherent deviations of measured, calculated, and / or provided values that would be recognized by a person of ordinary skill in the art.

[0103] The present disclosure provides a battery safety detection device, wherein the battery safety detection device can at least be 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.

[0104] Figure 1 Schematic 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 portion of a battery safety detection device according to an embodiment of the present disclosure. Figure 4 Schematic diagram of a strain sensing portion of a battery safety detection device according to another embodiment of the present disclosure. Figure 5Schematic diagram of the strain sensing part of the battery safety detection device according to another embodiment of the present disclosure. Figure 6 Schematic diagram of the first conductive layer of the strain sensing part of the battery safety detection device according to an embodiment of the present disclosure. Figure 7 Schematic diagram of the second conductive layer of the strain sensing part of the battery safety detection device according to an embodiment of the present disclosure. Figure 8 Schematic diagram of the first conductive layer of the strain sensing part of the battery safety detection device according to another embodiment of the present disclosure. Figure 9 Schematic diagram of the second conductive layer of the strain sensing part of the battery safety detection device according to another embodiment of the present disclosure. Figure 10 Schematic diagram of the signal detection part of the battery safety detection device according to an embodiment of the present disclosure.

[0105] The following combines Figures 1 to 10 to make a detailed description of the battery safety detection device and the battery management system of the present disclosure.

[0106] According to an embodiment of the present disclosure, the battery safety detection device includes:

[0107] At least one strain sensing part 12, at least one strain sensing part 12 is arranged on at least one surface of the battery 11 of the battery device 10, and the strain sensing part 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;

[0108] Wherein, the strain sensing part 12 includes at least one strain sensing device 120, the strain sensing device 120 includes a first conductive layer 121 and a second conductive layer 122, there is a preset distance 123 between the first conductive layer 121 and the second conductive layer 122, and the first conductive layer 121 or the second conductive layer 122 can respond to the deformation of the battery 11 to cause the preset distance 123 between the position of the first conductive layer 121 corresponding to the deformation and the position of the second conductive layer 122 corresponding to the deformation to change, and generate a strain electrical signal based on the change of the preset distance 123.

[0109] Wherein, the first conductive layer 121 and the second conductive layer 122 have matching sizes, and the first conductive layer 121 and the second conductive layer 122 can both be sheet-shaped conductive films, such as ITO (indium tin oxide) conductive layers.

[0110] It can be seen from Figure 1 that the battery device 10 can include only one battery 11, and the battery 11 can 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.

[0111] 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.

[0112] Figure 2 A strain sensing part 12 is arranged between each battery 11 of the battery device 10 shown in the figure, and a strain sensing part 12 is also arranged between the side surface of the battery 11 and the housing 15.

[0113] 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.

[0114] Figure 3 The structural schematic diagram of the strain sensing part 12 according to an embodiment of the present disclosure is shown. The first conductive layer 121 and the second conductive layer 122 can be two sheet-like conductive films arranged oppositely.

[0115] For the battery safety detection device according to an embodiment of the present disclosure, a first driving voltage is applied to both ends of the first conductive layer 121, and current sensing is performed on both ends of the first conductive layer 121. Based on the change of the sensed current, the change of the preset distance 123 between the first conductive layer 121 and the second conductive layer 122 is judged; or, a second driving voltage is applied to both ends of the second conductive layer 122, and current sensing is performed on both ends of the second conductive layer 122. Based on the change of the sensed current, the change of the preset distance 123 between the first conductive layer 121 and the second conductive layer 122 is judged; or, a first driving voltage is applied to both ends of the first conductive layer 121, and current sensing is performed on both ends of the first conductive layer 121. A second driving voltage is applied to both ends of the second conductive layer 122, and current sensing is performed on both ends of the second conductive layer 122. Based on the change of the current at both ends of the first conductive layer 121 and the change of the current at both ends of the second conductive layer 122, the change of the preset distance 123 between the first conductive layer 121 and the second conductive layer 122 is judged.

[0116] In this embodiment, the strain electrical signal includes the change of current.

[0117] The first conductive layer 121 and the second conductive layer 122 can both be resistive strain devices. When the deformation of the battery 11 or the deformation of the housing 15 causes the first conductive layer 121 or the second conductive layer 122 to deform, the resistance value of the first conductive layer 121 or the second conductive layer 122 will change. Therefore, the above-mentioned sensed current will change, and based on the change of the sensed current, the deformation of the battery 11 or the housing 15 can be indicated.

[0118] In the above embodiment, preferably, the battery safety detection device further includes a signal detection unit 13, and the signal detection unit 13 detects the strain electrical signal generated by the strain sensing unit 12.

[0119] According to the battery safety detection device of another embodiment of the present disclosure, a first driving current is applied to both ends of the first conductive layer 121, and the voltage at both ends of the first conductive layer 121 is sensed, and based on the change of the sensed voltage, the change of the preset distance 123 between the first conductive layer 121 and the second conductive layer 122 is judged; or, a second driving current is applied to both ends of the second conductive layer 122, and the voltage at both ends of the second conductive layer 122 is sensed, and based on the change of the sensed voltage, the change of the preset distance 123 between the first conductive layer 121 and the second conductive layer 122 is judged; or, a first driving current is applied to both ends of the first conductive layer 121, and the voltage at both ends of the first conductive layer 121 is sensed, a second driving current is applied to both ends of the second conductive layer 122, and the voltage at both ends of the second conductive layer 122 is sensed, and based on the change of the voltage at both ends of the first conductive layer 121 and the change of the voltage at both ends of the second conductive layer 122, the change of the preset distance 123 between the first conductive layer 121 and the second conductive layer 122 is judged.

[0120] In this embodiment, the strain electrical signal includes a change in voltage.

[0121] The first conductive layer 121 and the second conductive layer 122 can both be resistive strain devices. When the deformation of the battery 11 or the deformation of the housing 15 causes the first conductive layer 121 or the second conductive layer 122 to deform, the resistance value of the first conductive layer 121 or the second conductive layer 122 will change. Therefore, the above-mentioned sensed voltage will change, and based on the change of the sensed voltage, the deformation of the battery 11 or the housing 15 can be indicated.

[0122] In the above embodiment, preferably, the battery safety detection device further includes a signal detection unit 13, and the signal detection unit 13 detects the strain electrical signal generated by the strain sensing unit 12.

[0123] A battery safety detection device according to another embodiment of the present disclosure, the battery safety detection device includes: at least one strain sensing part 12, at least one strain sensing part 12 is disposed on at least one surface of a battery 11 of a battery device 10, and the strain sensing part 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; wherein, the strain sensing part 12 includes at least one strain sensing device 120, the strain sensing device 120 includes a first conductive layer 121 and a second conductive layer 122, there is a preset distance 123 between the first conductive layer 121 and the second conductive layer 122, and the first conductive layer 121 or the second conductive layer 122 can respond to the deformation of the battery 11 to cause a change in the preset distance 123 between the position of the first conductive layer 121 corresponding to the deformation and the position of the second conductive layer 122 corresponding to the deformation, and generate a strain electrical signal based on the change in the preset distance 123; the battery safety detection device further includes a signal detection part 13, the signal detection part 13 measures the mutual capacitance formed by the first conductive layer 121 and the second conductive layer 122, and judges the change in the preset distance 123 based on the change in the mutual capacitance.

[0124] In this embodiment, the strain electrical signal includes a change in mutual capacitance.

[0125] Wherein, the signal detection part 13 may include a capacitance measurement circuit in the prior art.

[0126] A battery safety detection device according to another embodiment of the present disclosure, applies a first driving voltage to both ends of the first conductive layer 121, and senses the voltage of the second conductive layer 122, and judges whether the first conductive layer 121 and the second conductive layer 122 are in contact based on whether a sensed voltage is generated.

[0127] That is, if a sensed voltage is generated, it means that the first conductive layer 121 and the second conductive layer are in contact due to the deformation of the battery 11 or the deformation of the housing 15.

[0128] A battery safety detection device according to another embodiment of the present disclosure, applies a second driving voltage to both ends of the second conductive layer 122, and senses the voltage of the first conductive layer 121, and judges whether the first conductive layer 121 and the second conductive layer 122 are in contact based on whether a sensed voltage is generated.

[0129] That is, if a sensed voltage is generated, it means that the first conductive layer 121 and the second conductive layer are in contact due to the deformation of the battery 11 or the deformation of the housing 15.

[0130] A battery safety detection device according to a preferred embodiment of the present disclosure alternately applies a driving voltage to both ends of the first conductive layer 121 and both ends of the second conductive layer 122. When the driving voltage is applied to both ends of the first conductive layer 121, the voltage of the second conductive layer 122 is sensed. When the driving voltage is applied to both ends of the second conductive layer 122, the voltage of the first conductive layer 121 is sensed; based at least on the magnitude of the sensed voltage generated when sensing the voltage of the first conductive layer 121 and the magnitude of the sensed voltage generated when sensing the voltage of the second conductive layer 122, the contact position between the first conductive layer 121 and the second conductive layer 122 is determined.

[0131] Wherein, both ends of the first conductive layer 121 to which the driving voltage is applied are both ends in the first direction, and both ends of the second conductive layer 122 to which the driving voltage is applied are both ends in the second direction, and the first direction is perpendicular to the second direction.

[0132] A battery safety detection device according to another embodiment of the present disclosure includes:

[0133] At least one strain sensing unit 12, 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.

[0134] Wherein, the strain sensing unit 12 includes at least one strain sensing device 120, the strain sensing device 120 includes a first conductive layer 121 and a second conductive layer 122, there is a preset distance 123 between the first conductive layer 121 and the second conductive layer 122, and the first conductive layer 121 or the second conductive layer 122 can respond to the deformation of the battery 11 to cause a change in the preset distance 123 between the position of the first conductive layer 121 corresponding to the deformation and the position of the second conductive layer 122 corresponding to the deformation, and generate a strain electrical signal based on the change in the preset distance 123.

[0135] Wherein, as Figure 5 and Figure 7 shown, the first conductive layer 121 includes a plurality of first conductive bars 1211 arranged in the first direction, adjacent two first conductive bars 1211 are insulated from each other, the second conductive layer 122 includes a plurality of second conductive bars 1221 arranged in the second direction, adjacent two second conductive bars are insulated from each other, and the first direction is perpendicular to the second direction.

[0136] Wherein, the size of the first conductive bar 1211 in the first direction can be appropriately set to adapt to the magnitude of the deformation occurring on the outer surface of the battery 11 or the magnitude of the deformation occurring on the inner surface of the housing 15.

[0137] The dimension of the second conductive strip 1221 along the second direction can be appropriately set to adapt to the deformation size occurring on the outer surface of the battery 11 or the deformation size occurring on the inner surface of the housing 15.

[0138] For example, for the convenience of Figure 4 attachment and Figure 5 description, the first direction can be set as the X direction (the horizontal direction of the paper surface), and the second direction can be set as the Y direction (the vertical direction of the paper surface).

[0139] The insulation between the first conductive strips 1211 can be achieved by setting an insulating substance between adjacent first conductive strips 1211, such as setting an insulating layer.

[0140] The insulation between the second conductive strips 1221 can be achieved by setting an insulating substance between adjacent second conductive strips 1221, such as setting an insulating layer.

[0141] Preferably, a second driving voltage is applied to both ends of all the second conductive strips 1221 of the second conductive layer 122, and voltage sensing is performed on all the first conductive strips 1211 of the first conductive layer 121. Based on whether a sensing voltage is generated, it is determined whether the first conductive layer 121 and the second conductive layer 122 are in contact, and based on the position of at least one first conductive strip 1211 that generates the sensing voltage in the first conductive layer 121, the contact position between the first conductive layer 121 and the second conductive layer 122 is determined.

[0142] Among them, when applying the second driving voltage to both ends of all the second conductive strips 1221 of the second conductive layer 122, it can be applied simultaneously or sequentially.

[0143] Preferably, a first driving voltage is applied to both ends of all the first conductive strips 1221 of the first conductive layer 121, and voltage sensing is performed on all the second conductive strips 1221 of the second conductive layer 122. Based on whether a sensing voltage is generated, it is determined whether the first conductive layer 121 and the second conductive layer 122 are in contact, and based on the position of at least one second conductive strip 1221 that generates the sensing voltage in the second conductive layer 122, the contact position between the first conductive layer 121 and the second conductive layer 122 is determined.

[0144] Among them, when applying the first driving voltage to both ends of all the first conductive strips 1221 of the first conductive layer 121 simultaneously, it can be applied simultaneously or sequentially.

[0145] Preferably, the driving voltage is alternately applied to both ends of all the first conductive strips 1211 of the first conductive layer 121 and both ends of all the second conductive strips 1221 of the second conductive layer 122.

[0146] When a driving voltage is applied to both ends of all the first conductive bars 1211 of the first conductive layer 121, voltage sensing is performed on all the second conductive bars 1221 of the second conductive layer 122. When a driving voltage is applied to both ends of all the second conductive bars 1221 of the second conductive layer 122, voltage sensing is performed on all the first conductive bars 1211 of the first conductive layer 121.

[0147] At least one contact position between the first conductive layer 121 and the second conductive layer 122 is obtained based at least on the position of at least one second conductive bar 1221 that generates a sensing voltage in the second conductive layer 122 and the position of at least one first conductive bar 1211 that generates a sensing voltage in the first conductive layer 121.

[0148] For example, the preset spacing 123 between the first conductive layer 121 and the second conductive layer 122 can be set to the maximum degree of deformation of the battery 11 that can be tolerated (the battery can still be used safely).

[0149] In each of the above embodiments, preferably, the battery safety detection device further includes a signal detection unit 13. The signal detection unit 13 measures the mutual capacitance formed between each first conductive bar 1211 and each second conductive bar 1221, and determines the position where the preset spacing 123 between the first conductive layer 121 and the second conductive layer 122 changes based on the change of at least one mutual capacitance, thereby determining at least one deformation position of the battery.

[0150] A battery safety detection device according to another embodiment of the present disclosure includes:

[0151] At least one strain sensing unit 12 is disposed on at least one surface of the battery 11 of the battery device 10. 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 deformation;

[0152] Wherein, the strain sensing unit 12 includes at least one strain sensing device 120. The strain sensing device 120 includes a first conductive layer 121 and a second conductive layer 122. There is a preset spacing 123 between the first conductive layer 121 and the second conductive layer 122. The first conductive layer 121 or the second conductive layer 122 can respond to the deformation of the battery 11 such that the preset spacing 123 between the position of the first conductive layer 121 corresponding to the deformation and the position of the second conductive layer 122 corresponding to the deformation changes, and a strain electrical signal is generated based on the change of the preset spacing 123.

[0153] Wherein, as Figure 8 and Figure 9As shown, the first conductive layer 121 includes an array of first rectangular conductive elements, and the first conductive elements in the array of first rectangular conductive elements are insulated from each other. The second conductive layer 122 includes an array of second rectangular conductive elements, and the second conductive elements in the array of second rectangular conductive elements are insulated from each other. The first conductive elements in the array of first rectangular conductive elements are disposed opposite to the second conductive elements in the array of second rectangular conductive elements.

[0154] Figure 8 Neutralize Figure 9 The number and shape of the first conductive elements shown in are exemplary.

[0155] For the battery safety detection device of the above embodiment, preferably, a second driving voltage is applied to all the second conductive elements of the second conductive layer 122, and voltage sensing is performed on all the first conductive elements of the first conductive layer 121. Based on whether a sensing voltage is generated, it is determined whether the first conductive layer 121 and the second conductive layer 122 are in contact, and based on the position of at least one first conductive element that generates the sensing voltage in the first conductive layer 121, the contact position between the first conductive layer 121 and the second conductive layer 122 is determined.

[0156] For the battery safety detection device of the above embodiment, preferably, a first driving voltage is applied to all the first conductive elements of the first conductive layer 121, and voltage sensing is performed on all the second conductive elements of the second conductive layer 122. Based on whether a sensing voltage is generated, it is determined whether the first conductive layer 121 and the second conductive layer 122 are in contact, and based on the position of at least one second conductive element that generates the sensing voltage in the second conductive layer 122, the contact position between the first conductive layer 121 and the second conductive layer 122 is determined.

[0157] For the battery safety detection device of the above embodiment, preferably, a driving voltage is alternately applied to all the first conductive elements of the first conductive layer 121 and all the second conductive elements of the second conductive layer 122.

[0158] When a driving voltage is applied to all the first conductive elements of the first conductive layer 121, voltage sensing is performed on all the second conductive elements of the second conductive layer 122. When a driving voltage is applied to all the second conductive elements of the second conductive layer 122, voltage sensing is performed on all the first conductive elements of the first conductive layer 121.

[0159] Based on at least the position of at least one second conductive element that generates the sensing voltage in the second conductive layer 122 and the position of at least one first conductive element that generates the sensing voltage in the first conductive layer 121, at least one contact position between the first conductive layer 121 and the second conductive layer 122 is obtained.

[0160] For example, the preset spacing 123 between the first conductive layer 121 and the second conductive layer 122 can be set to the maximum degree of deformation that the battery 11 can tolerate.

[0161] In the above embodiment, the battery safety detection device further includes a signal detection unit 13. The signal detection unit 13 measures the mutual capacitance formed by the first conductive element and the second conductive element of the relatively arranged first rectangular conductive element array and the second rectangular conductive element array, and determines the position where the preset spacing 123 between the first conductive layer 121 and the second conductive layer 122 changes based on the change of at least one mutual capacitance, so as to determine at least one deformation position of the battery.

[0162] For the battery safety detection device of each of the above embodiments, preferably, as Figure 5 shown, the first conductive layer 121 is disposed on the first substrate 125, and the second conductive layer 122 is disposed on the second substrate 126.

[0163] Among them, both the first substrate 125 and the second substrate 126 are insulating substrates.

[0164] For example, the battery safety detection device is disposed on the surface of the battery 11 through the first substrate 125 and the second substrate 126.

[0165] Among them, both the first substrate 125 and the second substrate 126 are flexible substrates. For example, a PET film.

[0166] As Figure 4 and Figure 5 shown, the preset spacing 123 described above is formed by the support portion 124, and the support portion 124 can be disposed between the first conductive layer 121 and the second conductive layer 122.

[0167] Preferably, the support portion 124 is disposed between the first substrate 125 and the second substrate 126.

[0168] Among them, the support portion 124 is made of an insulating material.

[0169] Among them, the support portion 124 can be disposed at the edges of the first conductive layer 121 and the second conductive layer 122, as Figure 4 shown.

[0170] Among them, the support portion 124 can be disposed at the edges of the first substrate 125 and the second substrate 126, as Figure 5 shown.

[0171] In the above embodiment, the support portion 124 can include a plurality of discrete support portions, or the support portion 124 is an integral structure, such as a square ring.

[0172] Those skilled in the art should understand that the strain sensing part 12 can be arranged between two adjacent batteries 11, and the strain sensing part can also be arranged between the battery 11 and the housing 15.

[0173] Those skilled in the art should understand that the strain sensing part 12 can also generate a strain electrical signal based on the deformation of the housing 15 of the battery device 10.

[0174] For the battery safety detection device of each of the above embodiments, preferably, as Figure 10 shown, the signal detection part 13 includes: a driving circuit for providing a driving signal to the strain sensing part 12; a detection circuit for detecting the strain electrical signal; and a controller for controlling the driving circuit to provide a driving signal to the strain sensing part 12 and processing the strain electrical signal obtained by the detection circuit to generate a processed strain electrical signal.

[0175] Preferably, the signal detection part 13 further includes a memory for storing the strain electrical signal processed by the controller.

[0176] The following further describes Figures 10 to 16 the circuit structure of the signal detection part of the present disclosure.

[0177] According to an embodiment of the present disclosure, as Figure 11 shown, the driving circuit of the signal detection part 13 includes: a digital-to-analog converter 302 that converts the digital driving signal received from the controller into an analog driving signal; an amplifier 303 that amplifies the analog driving signal to generate an amplified driving signal (Vs); and a multiplexer 304 that includes a plurality of signal channels, and the amplified driving signal is applied to the strain sensing part 12 via one or more of the plurality of signal channels.

[0178] In the above embodiment, preferably, the amplified driving signal is applied to one or more of the first conductive strips 1211 of the first conductive layer 121 of the strain sensing part 12 via one or more of the plurality of signal channels; or, the amplified driving signal is applied to one or more of the second conductive strips 1221 of the second conductive layer 122 of the strain sensing part 12 via one or more of the plurality of signal channels.

[0179] According to another embodiment of the present disclosure, as Figure 12As shown in the figure, the drive circuit of the signal detection unit 13 includes: a digital-to-analog converter 302 that converts the digital drive signal received from the controller into an analog drive signal; a multiplexer 304 that includes a plurality of signal channels, and the analog drive signal is output via one or more of the plurality of signal channels; and a plurality of amplifiers 303, each of which amplifies the analog drive signal output via one signal channel of the multiplexer 304, and the amplified analog drive signal is applied to the strain sensing unit 12.

[0180] In the above embodiment, preferably, the analog drive signal output from one or more of the plurality of signal channels is amplified and then applied to one or more first conductive strips 1211 of the first conductive layer 121 of the strain sensing unit 12; or, the analog drive signal output from one or more of the plurality of signal channels is amplified and then applied to one or more second conductive strips 1221 of the second conductive layer 122 of the strain sensing unit 12.

[0181] According to another embodiment of the present disclosure, as Figure 13 shown, the detection circuit of the signal detection unit 13 includes: a sense amplifier 306 that senses the induced charge of the first conductive layer 121 or the second conductive layer 122 of the strain sensing unit 12 and converts it into an amplified induced voltage; and an analog-to-digital converter 308 that performs analog-to-digital conversion on the amplified induced voltage, generates a digital induced voltage and outputs it to the controller, and the digital induced voltage indicates the change in the mutual capacitance between the first conductive layer 121 and the second conductive layer 122.

[0182] In the above embodiment, preferably, as Figure 14 shown, the detection circuit further includes a filter 307 disposed between the sense amplifier 306 and the analog-to-digital converter 308.

[0183] According to another embodiment of the present disclosure, as Figure 15 shown, the detection circuit of the signal detection unit 13 includes: a differential amplifier 309 that amplifies the sensed voltages (Vb+, Vb-) of the first conductive layer 121 or the second conductive layer 122 of the strain sensing unit 12 to generate an amplified sensed voltage; and an analog-to-digital converter 311 that converts the amplified sensed voltage into a digital signal and outputs it to the controller.

[0184] In the above embodiment, preferably, as Figure 16As shown, the detection circuit further includes a differential anti-aliasing filter 310, and the differential anti-aliasing filter 310 is disposed between the differential amplifier 309 and the analog-to-digital converter 311.

[0185] Figure 16 The structure of the differential amplifier 309 is also exemplarily shown.

[0186] Those skilled in the art should understand that the battery safety detection device of the present disclosure may include multiple Figure 10 signal detection units 13 as shown, to drive and detect each strain sensing unit 12 respectively. The battery safety detection device of the present disclosure may also include only one signal detection unit 13, and can drive and detect each strain sensing unit 12 through multiple telecommunication channels.

[0187] The signal detection unit 13 may be in the form of a chip or in the form of a PCB circuit board. The present disclosure does not make a special limitation on the specific form of the signal detection unit 13.

[0188] A battery safety detection device according to another embodiment of the present disclosure includes:

[0189] At least one strain sensing unit 12, and at least one strain sensing unit 12 is disposed on at least one surface of the battery 11 of the battery device 10. 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.

[0190] Wherein, the strain sensing unit 12 includes at least one strain sensing device 120, and the strain sensing device 120 includes a first conductive layer 121 and a second conductive layer 122. There is a preset distance 123 between the first conductive layer 121 and the second conductive layer 122. The first conductive layer 121 or the second conductive layer 122 can respond to the deformation of the battery 11 to cause the position of the first conductive layer 121 corresponding to the deformation of the battery 11 to deform or the position of the second conductive layer 122 corresponding to the deformation of the battery 11 to deform. The strain sensing unit 12 generates a strain electrical signal based on the deformation of the first conductive layer 121 or the deformation of the second conductive layer 122.

[0191] The present disclosure also provides a battery management system, including the battery safety detection device of any one of the above embodiments. Figure 17 The battery management system is shown, wherein the signal detection unit described above can be integrated into a chip, and the pin of the chip is connected to the strain sensing unit 1701.

[0192] In the description of this specification, the description referring to terms such as "one embodiment / way", "some embodiments / ways", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with that embodiment / way or example are included in at least one embodiment / way or example of this 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.

[0193] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of this application, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0194] Those skilled in the art should understand that the above embodiments are only for clearly explaining 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, 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 at least generating a strain electrical signal based on a deformation of the battery of the battery device, the strain electrical signal at least indicating the occurrence of the deformation; A signal detection part for detecting the strain electrical signal generated by the strain sensing part; Wherein, the strain sensing part includes at least one strain sensing device, the strain sensing device includes a first conductive layer and a second conductive layer, there is a preset distance between the first conductive layer and the second conductive layer, the first conductive layer or the second conductive layer can respond to the deformation of the battery to cause a change in the preset distance between the position of the first conductive layer corresponding to the deformation and the position of the second conductive layer corresponding to the deformation, and generate the strain electrical signal based on the change in the preset distance; The signal detection part detecting the strain electrical signal generated by the strain sensing part includes: Applying a driving voltage to both ends of any one conductive layer and sensing the current at both ends thereof, and judging the change in the preset distance based on the change in the sensed current; Or, applying a driving current to both ends of any one conductive layer and sensing the voltage at both ends thereof, and judging the change in the preset distance based on the change in the sensed voltage; Or, applying a driving voltage to both ends of any one conductive layer and sensing the voltage at both ends of the other conductive layer, and judging the change in the preset distance based on the change in the sensed voltage.

2. The battery safety detection device according to claim 1, wherein The applying a driving voltage to both ends of any one conductive layer and sensing the current at both ends thereof includes: Applying a first driving voltage to both ends of the first conductive layer and sensing the current at both ends of the first conductive layer, and judging the change in the preset distance between the first conductive layer and the second conductive layer based on the change in the sensed current; Or, applying a second driving voltage to both ends of the second conductive layer and sensing the current at both ends of the second conductive layer, and judging the change in the preset distance between the first conductive layer and the second conductive layer based on the change in the sensed current; Or, applying a first driving voltage to both ends of the first conductive layer and sensing the current at both ends of the first conductive layer, applying a second driving voltage to both ends of the second conductive layer and sensing the current at both ends of the second conductive layer, and judging the change in the preset distance between the first conductive layer and the second conductive layer based on the change in the current at both ends of the first conductive layer and the change in the current at both ends of the second conductive layer; The strain electrical signal includes the change in the current.

3. The battery safety detection device according to claim 1, characterized in that The applying a driving current to both ends of any one conductive layer and sensing the voltage at both ends thereof includes: Applying a first driving current to both ends of the first conductive layer and sensing the voltage at both ends of the first conductive layer, and judging the change in the preset distance between the first conductive layer and the second conductive layer based on the change in the sensed voltage; Alternatively, a second driving current is applied to both ends of the second conductive layer, and voltage sensing is performed on both ends of the second conductive layer. The change in the preset distance between the first conductive layer and the second conductive layer is determined based on the change in the sensed voltage. Alternatively, a first driving current is applied to both ends of the first conductive layer, and voltage sensing is performed on both ends of the first conductive layer. A second driving current is applied to both ends of the second conductive layer, and voltage sensing is performed on both ends of the second conductive layer. The change in the preset distance between the first conductive layer and the second conductive layer is determined based on the change in the voltage at both ends of the first conductive layer and the change in the voltage at both ends of the second conductive layer. The strain electrical signal includes the change in the voltage.

4. The battery safety detection device according to claim 1, characterized in that, The signal detection unit measures the mutual capacitance formed by the first conductive layer and the second conductive layer, and determines the change in the preset distance based on the change in the mutual capacitance. The strain electrical signal includes the change in the mutual capacitance.

5. The battery safety detection device according to claim 1, wherein The step of applying a driving voltage to both ends of any one of the conductive layers and performing voltage sensing on both ends of the other conductive layer includes: Applying a first driving voltage to both ends of the first conductive layer, and performing voltage sensing on the second conductive layer. It is determined whether the first conductive layer and the second conductive layer are in contact based on whether a sensed voltage is generated. Alternatively, applying a second driving voltage to both ends of the second conductive layer, and performing voltage sensing on the first conductive layer. It is determined whether the first conductive layer and the second conductive layer are in contact based on whether a sensed voltage is generated.

6. The battery safety detection device according to claim 1, characterized in that, The step of applying a driving voltage to both ends of any one of the conductive layers and performing voltage sensing on both ends of the other conductive layer includes: Alternately applying a driving voltage to both ends of the first conductive layer and both ends of the second conductive layer. When a driving voltage is applied to both ends of the first conductive layer, voltage sensing is performed on the second conductive layer. When a driving voltage is applied to both ends of the second conductive layer, voltage sensing is performed on the first conductive layer. The contact position between the first conductive layer and the second conductive layer is determined based at least on the magnitude of the sensed voltage generated when voltage sensing is performed on the first conductive layer and the magnitude of the sensed voltage generated when voltage sensing is performed on the second conductive layer.

7. The battery safety detection device according to claim 6, characterized in that Both ends of the first conductive layer to which the driving voltage is applied are the two ends in the first direction, and both ends of the second conductive layer to which the driving voltage is applied are the two ends in the second direction. The first direction is perpendicular to the second direction.

8. The battery safety detection device according to claim 1, characterized in that, The first conductive layer includes a plurality of first conductive strips arranged in the first direction, and adjacent first conductive strips are insulated from each other. The second conductive layer includes a plurality of second conductive strips arranged in the second direction, and adjacent second conductive strips are insulated from each other. The first direction is perpendicular to the second direction.

9. The battery safety detection device according to claim 8, characterized in that, The step of applying a driving voltage to both ends of any one of the conductive layers and performing voltage sensing on both ends of the other conductive layer includes: Apply a second driving voltage to both ends of all the second conductive bars of the second conductive layer, and sense the voltage of all the first conductive bars of the first conductive layer. Based on whether a sensed voltage is generated, determine whether the first conductive layer and the second conductive layer are in contact. Based on the position of at least one first conductive bar that generates a sensed voltage in the first conductive layer, determine the contact position between the first conductive layer and the second conductive layer; Alternatively, apply a first driving voltage to both ends of all the first conductive bars of the first conductive layer, and sense the voltage of all the second conductive bars of the second conductive layer. Based on whether a sensed voltage is generated, determine whether the first conductive layer and the second conductive layer are in contact. Based on the position of at least one second conductive bar that generates a sensed voltage in the second conductive layer, determine the contact position between the first conductive layer and the second conductive layer.

10. The battery safety detection device according to claim 8, characterized in that, The applying a driving voltage to both ends of any one conductive layer and sensing the voltage of both ends of the other conductive layer includes: Alternately apply a driving voltage to both ends of all the first conductive bars of the first conductive layer and both ends of all the second conductive bars of the second conductive layer; When applying a driving voltage to both ends of all the first conductive bars of the first conductive layer, sense the voltage of all the second conductive bars of the second conductive layer. When applying a driving voltage to both ends of all the second conductive bars of the second conductive layer, sense the voltage of all the first conductive bars of the first conductive layer; Obtain at least one contact position between the first conductive layer and the second conductive layer based at least on the position of at least one second conductive bar that generates a sensed voltage in the second conductive layer and the position of at least one first conductive bar that generates a sensed voltage in the first conductive layer.

11. The battery safety detection device according to claim 8, wherein, The signal detection unit measures the mutual capacitance formed between each first conductive bar and each second conductive bar, and based on the change of at least one mutual capacitance, determines the position where the preset distance between the first conductive layer and the second conductive layer changes, thereby determining at least one deformation position of the battery.

12. The battery safety detection device according to claim 1, wherein The first conductive layer 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 conductive layer 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.

13. The battery safety detection device according to claim 12, characterized in that, The applying a driving voltage to both ends of any one conductive layer and sensing the voltage of both ends of the other conductive layer includes: Apply a second driving voltage to all the second conductive elements of the second conductive layer, and sense the voltage of all the first conductive elements of the first conductive layer. Based on whether a sensed voltage is generated, determine whether the first conductive layer and the second conductive layer are in contact. Based on the position of at least one first conductive element that generates a sensed voltage in the first conductive layer, determine the contact position between the first conductive layer and the second conductive layer; Alternatively, apply a first driving voltage to all the first conductive elements of the first conductive layer, and sense the voltage of all the second conductive elements of the second conductive layer. Determine whether the first conductive layer is in contact with the second conductive layer based on whether a sensed voltage is generated, and determine the contact position between the first conductive layer and the second conductive layer based on the position of at least one second conductive element that generates the sensed voltage in the second conductive layer.

14. The battery safety detection device according to claim 12, wherein The applying a driving voltage to both ends of any one of the conductive layers and sensing the voltage at both ends of the other conductive layer includes: alternately applying a driving voltage to all the first conductive elements of the first conductive layer and all the second conductive elements of the second conductive layer; when applying a driving voltage to all the first conductive elements of the first conductive layer, sensing the voltage of all the second conductive elements of the second conductive layer, and when applying a driving voltage to all the second conductive elements of the second conductive layer, sensing the voltage of all the first conductive elements of the first conductive layer; obtain at least one contact position between the first conductive layer and the second conductive layer based at least on the position of at least one second conductive element that generates the sensed voltage in the second conductive layer and the position of at least one first conductive element that generates the sensed voltage in the first conductive layer.

15. The battery safety detection device according to claim 12, wherein, The signal detection unit measures the mutual capacitance formed by the first conductive element and the second conductive element arranged opposite to each other in the first rectangular conductive element array and the second rectangular conductive element array, and determines the position where the preset distance between the first conductive layer and the second conductive layer changes based on the change of at least one mutual capacitance, so as to determine at least one deformation position of the battery.

16. The battery safety detection device according to claim 1, characterized in that, The first conductive layer is disposed on a first substrate, and the second conductive layer is disposed on a second substrate.

17. The battery safety detection device according to claim 16, wherein Both the first substrate and the second substrate are insulating substrates.

18. The battery safety detection device according to claim 17, wherein, Both the first substrate and the second substrate are flexible substrates.

19. The battery safety detection device according to claim 1, characterized in that The preset distance is formed by a support portion, and the support portion is disposed between the first conductive layer and the second conductive layer.

20. The battery safety detection device according to claim 16, wherein, The preset distance is formed by a support portion, and the support portion is disposed between the first substrate and the second substrate.

21. The battery safety detection device according to claim 19, characterized in that, The support portion is disposed at the edge of the first conductive layer and the second conductive layer.

22. The battery safety detection device according to claim 20, wherein, The support portion is disposed at the edge of the first substrate and the second substrate.

23. The battery safety detection device according to any one of claims 19 to 22, characterized in that The support portion includes a plurality of discrete support portions, or the support portion is an integral structure.

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

25. The battery safety detection device according to claim 1, wherein, The strain sensing portion can be disposed between the battery and the housing.

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

27. The battery safety detection device according to claim 1, wherein The signal detection unit includes: a driving circuit for providing a driving signal to the strain sensing portion; a detection 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 detection circuit to generate a processed strain electrical signal.

28. The battery safety detection device according to claim 27, wherein The signal detection unit further includes a memory, and the memory stores the strain electrical signal processed by the controller.

29. The battery safety detection device according to claim 27, wherein, The drive circuit includes: A digital-to-analog converter that converts the digital drive signal received from the controller into an analog drive signal; An amplifier that amplifies the analog drive signal to generate an amplified drive signal; and A multiplexer that includes a plurality of signal channels, and the drive signal amplified by the amplifier is applied to the strain sensing unit via one or more of the plurality of signal channels.

30. The battery safety detection device according to claim 29, wherein The drive signal amplified by the amplifier is applied to one or more first conductive strips of the first conductive layer of the strain sensing unit via one or more of the plurality of signal channels; Alternatively, the drive signal amplified by the amplifier is applied to one or more second conductive strips of the second conductive layer of the strain sensing unit via one or more of the plurality of signal channels.

31. The battery safety detection device according to claim 27, characterized in that, The drive circuit includes: A digital-to-analog converter that converts the digital drive signal received from the controller into an analog drive signal; A multiplexer that includes a plurality of signal channels, and the analog drive signal is output via one or more of the plurality of signal channels; and A plurality of amplifiers, each of which amplifies the analog drive signal output via one signal channel of the multiplexer, and the amplified analog drive signal is applied to the strain sensing unit.

32. The battery safety detection device according to claim 31, wherein The analog drive signal output via one or more of the plurality of signal channels is amplified and applied to one or more first conductive strips of the first conductive layer of the strain sensing unit; Alternatively, the analog drive signal output via one or more of the plurality of signal channels is amplified and applied to one or more second conductive strips of the second conductive layer of the strain sensing unit.

33. The battery safety detection device according to claim 27, wherein The detection circuit includes: A sense amplifier that senses the induced charge on the first conductive layer or the second conductive layer of the strain sensing unit and converts it into an amplified induced voltage; and An analog-to-digital converter that performs analog-to-digital conversion on the amplified induced voltage, generates a digital induced voltage and outputs it to the controller, and the digital induced voltage indicates the change in the mutual capacitance between the first conductive layer and the second conductive layer.

34. The battery safety detection device according to claim 33, wherein It further includes a filter, and the filter is disposed between the sense amplifier and the analog-to-digital converter.

35. The battery safety detection device according to claim 27, wherein The detection circuit includes: A differential amplifier that amplifies the sensed voltage on the first conductive layer or the second conductive layer of the strain sensing unit to generate an amplified sensed voltage; and An analog-to-digital converter that converts the amplified sensed voltage into a digital signal and outputs it to the controller.

36. The battery safety detection device according to claim 35, wherein, The detection circuit further includes a differential anti-aliasing filter, and the differential anti-aliasing filter is disposed between the differential amplifier and the analog-to-digital converter.

37. A battery safety detection device, characterized in that, Includes: At least one strain sensing part, which is arranged 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; A signal detection part, which detects the strain electrical signal generated by the strain sensing part; Wherein, the strain sensing part includes at least one strain sensing device, and the strain sensing device includes a first conductive layer and a second conductive layer, and there is a preset distance between the first conductive layer and the second conductive layer. The first conductive layer or the second conductive layer can respond to the deformation of the battery to cause the position of the first conductive layer corresponding to the deformation of the battery to deform or the position of the second conductive layer 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 first conductive layer or the deformation of the second conductive layer; The signal detection part detecting the strain electrical signal generated by the strain sensing part includes: Applying a driving voltage to both ends of any one conductive layer and sensing the current at both ends thereof, and judging the change of the preset distance based on the change of the sensed current; Or, applying a driving current to both ends of any one conductive layer and sensing the voltage at both ends thereof, and judging the change of the preset distance based on the change of the sensed voltage; Or, applying a driving voltage to both ends of any one conductive layer and sensing the voltage at both ends of the other conductive layer, and judging the change of the preset distance based on the change of the sensed voltage.

38. A battery management system, characterized in that, Comprising: The battery safety detection device according to any one of claims 1 to 37.

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