Battery safety detection device and battery management system

Abstract

The present disclosure provides a battery safety detection device, comprising: a first piezoelectric part, generating a charge that changes according to battery deformation; a first plate part, arranged on one side of the first piezoelectric part and coupled with the first piezoelectric part; a second plate part, arranged on the other side of the first piezoelectric part and coupled with the first piezoelectric part; and a detection part, used to detect the charge generated by the first piezoelectric part between the first plate part and the second plate part, wherein when the battery is deformed, the first piezoelectric part is deformed so that the charge generated by the first piezoelectric part changes, and the detection part connected to the first plate part or the second plate part detects the charge change of the first piezoelectric part by detecting the capacitance change between the first plate part and the second plate part, thereby detecting the deformation of the battery. The present disclosure also provides a battery management system.

Description

Technical Field

[0001] The present disclosure provides a battery safety detection device and a battery management system. Background Art

[0002] Lithium batteries will deform when subjected to external forces, and will also bulge when the battery ages. When lithium batteries have the above problems, internal short circuits, fires and explosions will occur. Therefore, safety testing of lithium batteries is necessary. How to effectively and accurately detect battery deformation and how to predict battery failures are issues that need to be solved in the field of battery safety. Summary of the invention

[0003] In order to solve one of the above technical problems, the present disclosure provides a battery safety detection device and a battery management system.

[0004] According to one aspect of the present disclosure, a battery safety detection device includes:

[0005] a first piezoelectric portion, the first piezoelectric portion generating a changing charge according to a battery deformation;

[0006] a first electrode portion, the first electrode portion being disposed on one side of the first piezoelectric portion and coupled to the first piezoelectric portion;

[0007] a second electrode portion, the second electrode portion being disposed on the other side of the first piezoelectric portion and coupled to the first piezoelectric portion; and

[0008] a detection unit configured to detect charges generated by the first piezoelectric portion between the first electrode portion and the second electrode portion,

[0009] When the battery is deformed, the first piezoelectric part is deformed so that the charge generated by the first piezoelectric part changes. The detection part connected to the first electrode plate part or the second electrode plate part detects the charge change of the first piezoelectric part by detecting the capacitance change between the first electrode plate part and the second electrode plate part, thereby detecting the deformation of the battery.

[0010] According to at least one embodiment of the present disclosure, the battery safety detection device is located between two adjacent batteries or between an outer casing accommodating a plurality of batteries and the batteries.

[0011] In the case where the battery safety detection device is located between two adjacent batteries, the first electrode portion is located on the surface of one battery, and the second electrode portion is located on the surface of the other battery, and

[0012] In the case where the battery safety detection device is located between an outer shell accommodating a plurality of batteries and the batteries, the first electrode plate portion is located on a surface of one battery, and the second electrode plate portion is located on a surface of the outer shell.

[0013] According to at least one embodiment of the present disclosure, an insulating layer is provided between the first electrode portion and the surface of the one battery, and an insulating layer is provided between the second electrode portion and the surface of the other battery or the surface of the outer shell.

[0014] According to at least one embodiment of the present disclosure, the first electrode plate portion and the second electrode plate portion each include more than one electrode.

[0015] According to at least one embodiment of the present disclosure, the first electrode plate portion includes a plurality of electrodes, the second electrode plate portion includes a plurality of electrodes, and the electrodes of the first electrode plate portion are arranged corresponding to the electrodes of the second electrode plate portion, or the first electrode plate portion includes a plurality of electrodes, and the second electrode plate portion includes one electrode.

[0016] According to at least one embodiment of the present disclosure, the shapes of the electrode of the first electrode plate portion and the electrode of the second electrode plate portion are respectively circular, elliptical, square, rectangular, diamond, and / or triangular.

[0017] According to at least one embodiment of the present disclosure, the first electrode portion and the second electrode portion respectively include a plurality of strip electrodes, the strip electrodes of the first electrode portion and the strip electrodes of the second electrode portion have different extension directions, or the first electrode portion includes a plurality of strip electrodes, and the second electrode portion includes one electrode.

[0018] According to at least one embodiment of the present disclosure, the battery safety detection device further includes:

[0019] a second piezoelectric portion, wherein one side of the second piezoelectric portion is arranged on one side of the second electrode portion and is coupled to the second electrode portion, and one side of the second electrode portion is opposite to the side on which the second electrode portion and the first piezoelectric portion are coupled; and a third electrode portion, wherein one side of the third electrode portion is arranged on the other side of the second piezoelectric portion and is coupled to the second piezoelectric portion.

[0020] According to at least one embodiment of the present disclosure, the first electrode portion, the first piezoelectric portion, and the second electrode portion are used to detect one type of battery deformation, and the second electrode portion, the second piezoelectric portion, and the third electrode portion are used to detect another type of battery deformation.

[0021] According to at least one embodiment of the present disclosure, the battery safety detection device is located between two adjacent batteries or between an outer casing accommodating a plurality of batteries and the batteries.

[0022] In the case where the battery safety detection device is located between two adjacent batteries, the first electrode portion is located on the surface of one battery, and the third electrode portion is located on the surface of another battery, and

[0023] In the case where the battery safety detection device is located between an outer shell accommodating a plurality of batteries and the batteries, the first electrode plate portion is located on a surface of one battery, and the third electrode plate portion is located on a surface of the outer shell.

[0024] According to at least one embodiment of the present disclosure, an insulating layer is provided between the first electrode portion and the surface of the one battery, and an insulating layer is provided between the third electrode portion and the surface of the other battery or the surface of the outer shell.

[0025] According to at least one embodiment of the present disclosure, the first electrode portion, the second electrode portion, and the third electrode portion each include more than one electrode.

[0026] According to at least one embodiment of the present disclosure, the first electrode portion includes a plurality of electrodes, the second electrode portion includes a plurality of electrodes, the third electrode portion includes a plurality of electrodes, and the electrodes of the first electrode portion, the second electrode portion, and the third electrode portion are arranged correspondingly, or

[0027] The first electrode plate portion and the third electrode plate portion include a plurality of electrodes, and the second electrode plate portion includes one electrode.

[0028] According to at least one embodiment of the present disclosure, the shapes of the electrodes of the first electrode plate portion, the second electrode plate portion, and the third electrode plate portion are respectively circular, elliptical, square, rectangular, diamond, and / or triangular.

[0029] According to at least one embodiment of the present disclosure, the first electrode portion, the second electrode portion, and the third electrode portion respectively include a plurality of strip electrodes, the strip electrodes of the first electrode portion and the strip electrodes of the second electrode portion extend in different directions, the strip electrodes of the third electrode portion and the strip electrodes of the second electrode portion extend in different directions, or

[0030] The first electrode portion and the third electrode portion include a plurality of strip electrodes, and the second electrode portion includes one electrode.

[0031] According to at least one embodiment of the present disclosure, the first pole plate portion includes more than two electrodes, the electrodes of the first pole plate portion are divided into first type electrodes and second type electrodes, the second pole plate portion includes more than two electrodes, the electrodes of the second pole plate portion are divided into first type electrodes and second type electrodes, the first type electrodes of the first pole plate portion and the first type electrodes of the second pole plate portion are used to measure one type of deformation, and the second type electrodes of the first pole plate portion and the second type electrodes of the second pole plate portion are used to measure another type of deformation.

[0032] According to at least one embodiment of the present disclosure, the shapes of the electrode of the first electrode plate portion and the electrode of the second electrode plate portion are respectively circular, elliptical, square, rectangular, diamond, and / or triangular; or

[0033] The first electrode portion and the second electrode portion respectively include a plurality of strip electrodes, and the strip electrodes of the first electrode portion and the strip electrodes of the second electrode portion extend in different directions.

[0034] According to at least one embodiment of the present disclosure, the first electrode portion and / or the second electrode portion includes more than two electrodes, and the battery safety detection device includes more than two detection portions, each detection portion being respectively connected to a different electrode among the more than two electrodes of the first electrode portion and / or the second electrode portion.

[0035] According to at least one embodiment of the present disclosure, the detection unit includes:

[0036] a first driving circuit, the first driving circuit being used to apply an excitation signal to one of the first plate portion and the second plate portion, and to receive an induced voltage generated by an induced capacitor between the first plate portion and the second plate portion through the other plate portion;

[0037] an amplifier, wherein one input terminal of the amplifier is connected to the induced voltage, and the other input terminal of the amplifier is connected to a reference voltage;

[0038] an oscillator for generating an oscillation signal; and

[0039] A multiplier is used to multiply the oscillation signal with the output signal of the amplifier, and a DC part of the output signal of the multiplier is used to detect battery deformation.

[0040] According to at least one embodiment of the present disclosure, the battery safety detection device further includes:

[0041] a reference capacitor, one end of which is connected to the one input end of the amplifier; and

[0042] A second driving circuit is provided, wherein the second driving circuit provides a driving signal to the other end of the reference capacitor.

[0043] According to at least one embodiment of the present disclosure, the driving signal provided by the second driving circuit has the same phase and / or frequency as the driving signal of the first driving circuit.

[0044] According to at least one embodiment of the present disclosure, the detection unit further includes a filter connected to an output end of the multiplier.

[0045] According to another aspect of the present disclosure, a battery management system includes:

[0046] The battery safety detection device as described above;

[0047] a channel selection circuit, the channel selection circuit being used to select one of the plurality of electrodes of the first electrode portion or the second electrode portion for measurement; and

[0048] A control logic is provided, the control logic being configured to provide a channel selection signal to the channel selection circuit and to receive a detection signal from the channel selection circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The accompanying drawings illustrate exemplary embodiments of the present disclosure and together with the description serve to explain the principles of the present disclosure. These drawings are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this specification.

[0050] Figure 1 A schematic diagram of a battery pack according to one embodiment of the present disclosure is shown.

[0051] Figure 2 A schematic diagram of a battery safety detection device according to an embodiment of the present disclosure is shown.

[0052] Figure 3 A schematic diagram of a battery safety detection device according to an embodiment of the present disclosure is shown.

[0053] Figure 4 A schematic diagram of a battery safety detection device according to an embodiment of the present disclosure is shown.

[0054] Figure 5 A schematic diagram of a battery safety detection device according to an embodiment of the present disclosure is shown.

[0055] Figure 6 A schematic diagram of a battery safety detection device according to an embodiment of the present disclosure is shown.

[0056] Figure 7A schematic diagram of a battery safety detection device according to an embodiment of the present disclosure is shown.

[0057] Figure 8 A schematic diagram of a battery safety detection device according to an embodiment of the present disclosure is shown.

[0058] Fig. 9 A schematic diagram of a battery safety detection device according to an embodiment of the present disclosure is shown.

[0059] Fig.10 A schematic diagram of a detection control system of a battery safety detection device according to an embodiment of the present disclosure is shown.

[0060] Fig.11 A schematic diagram of a detection circuit of a battery safety detection device according to an embodiment of the present disclosure is shown.

[0061] Fig.12 A schematic diagram of a detection circuit of a battery safety detection device according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0062] The present disclosure is further described in detail below in conjunction with the accompanying drawings and implementations. It is understood that the specific implementations described herein are only used to explain the relevant content, rather than to limit the present disclosure. It should also be noted that, for ease of description, only the parts related to the present disclosure are shown in the accompanying drawings.

[0063] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in the present disclosure can be combined with each other. The technical solution of the present disclosure will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0064] Unless otherwise specified, the exemplary embodiments / embodiments shown will be understood as providing 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, the features of the various embodiments / embodiments can be combined, separated, interchanged and / or rearranged without departing from the technical concept of the present disclosure.

[0065] The use of cross-hatching and / or shading in the accompanying drawings is generally used to make the boundaries between adjacent components clear. As such, unless otherwise specified, the presence or absence of cross-hatching or shading does not convey or indicate any preference or requirement for the specific materials, material properties, dimensions, proportions, commonalities between the components shown, and / or any other characteristics, attributes, properties, etc. of the components. In addition, in the accompanying drawings, the sizes and relative sizes of the components may be exaggerated for clarity and / or descriptive purposes. When the exemplary embodiments can be implemented differently, the specific process sequence can be performed in a different order than described. For example, two successively described processes can be performed substantially simultaneously or in an order opposite to the described order. In addition, the same figure numbers represent the same components.

[0066] When a component is referred to as being "on" or "over," "connected to," or "coupled to" another component, the component may be directly on, directly connected to, or directly coupled to the other component, or intervening components may be present. However, when a component is referred to as being "directly on," "directly connected to," or "directly coupled to" another component, there are no intervening components. For this purpose, the term "connected" may refer to a physical connection, an electrical connection, etc., with or without intervening components.

[0067] For descriptive purposes, the present disclosure may use spatially relative terms such as "under," "beneath," "under," "down," "over," "upper," "above," "higher," and "side (e.g., as in "sidewall")," to describe the relationship of one component to another (other) component as shown in the accompanying drawings. The spatially relative terms are intended to encompass different orientations of the device in use, operation, and / or manufacture in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, components described as "under" or "beneath" other components or features would subsequently be positioned "over" the other components or features. Thus, the exemplary term "under" can encompass both the "above" and "below" orientations. Furthermore, the device may be otherwise oriented (e.g., rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein should be interpreted accordingly.

[0068] The terms used here are for the purpose of describing specific embodiments, and are not intended to be restrictive. As used here, unless the context clearly indicates otherwise, the singular forms "one (kind, person)" and "said (the)" are also intended to include plural forms. In addition, when the terms "comprise" and / or "include" and their variations are used in this specification, it is explained that there are stated features, integral bodies, steps, operations, parts, assemblies and / or their groups, but it is not excluded that there are or add one or more other features, integral bodies, steps, operations, parts, assemblies and / or their groups. It should also be noted that, as used here, the terms "substantially", "approximately" and other similar terms are used as approximate terms and not as degree terms, so that they are used to explain the inherent deviations of the measured values, calculated values ​​and / or the values ​​provided that will be recognized by those of ordinary skill in the art.

[0069] 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 cell, wherein the deformation can be caused by a battery bulging type deformation, or a deformation formed by the battery being subjected to external compression. The cause of the external compression can include, for example, collision, or acceleration.

[0070] Figure 1 Schematic diagram of a battery pack according to one embodiment of the present disclosure is shown. Figure 1 As shown, the battery pack 100 may include a plurality of batteries 110 , a first electrode plate portion 120 , a piezoelectric portion 130 , a second electrode plate portion 140 , and a housing 150 .

[0071] It should be noted that although Figure 1 The figure shows a safety detection device for multiple batteries housed in a shell 150, but those skilled in the art should understand that the battery safety detection device disclosed herein can also be used for other forms of battery structures, such as providing a battery safety detection device (including a first electrode plate portion 120, a piezoelectric portion 130, and a second electrode plate portion 140) only between two adjacent batteries.

[0072] like Figure 1 As shown, the battery safety detection device can be disposed between two adjacent batteries 110 , or between a battery 110 and the housing 150 .

[0073] The first electrode plate 120 may be a thin plate disposed on the surface of a battery 110, or a thin film disposed on the surface of a battery 110, or a coating coated on the surface of a battery 110. The first electrode plate 120 may be a conductor, a semiconductor, or a conductive material. In addition, the first electrode plate 120 may also be formed of aluminum foil used for battery packaging.

[0074] The second electrode plate portion 140 may be a thin plate disposed on the surface of another adjacent battery 110, or a thin film disposed on the surface of another battery 110, or a coating coated on the surface of another battery 110. The second electrode plate portion 140 may be a conductor, a semiconductor, or a conductive material. In addition, the second electrode plate portion 130 may also be formed of aluminum foil for battery packaging.

[0075] In addition, an insulating layer may be provided between the first electrode portion 120 and the battery surface to prevent the first electrode portion 120 from forming a short circuit with the battery surface. An insulating layer may be provided between the second electrode portion 140 and the battery surface to prevent the second electrode portion 140 from forming a short circuit with the battery surface. The insulating layer may also serve as an adhesive layer to bond the first electrode portion 120 and the second electrode portion 140 to the battery surface, respectively.

[0076] The piezoelectric portion 130 is disposed between the first electrode portion 120 and the second electrode portion 140, and the piezoelectric portion may be a piezoelectric plate, a piezoelectric film, or a piezoelectric material coated between the first electrode portion 120 and / or the second electrode portion 140. The piezoelectric portion 130 may generate an electric charge in response to deformation of the battery, and the electric charge may be conducted to the first electrode portion 120 or the second electrode portion 140, and the first electrode portion 120 and the second electrode portion 140 may be used to detect the generated electric charge, and transmit the electric charge information to the processing circuit through an interface connected to the first electrode portion 120 and the second electrode portion 140, so that the processing circuit determines the deformation applied to the piezoelectric portion 130 according to the generated electric charge.

[0077] In the following embodiments, a battery safety detection device disposed between two adjacent batteries will be taken as an example for description.

[0078] Figure 2 A schematic diagram of a battery safety detection device according to an embodiment of the present disclosure is shown. The battery safety detection device is disposed between two batteries 210 , and may include a first electrode portion 220 , a second electrode portion 230 and a piezoelectric portion 240 .

[0079] The piezoelectric part 240 may generate electric charge according to the deformation of the battery 210. A first electrode part 220 and a second electrode part 230 are provided on both sides of the piezoelectric part 240. The first electrode part 220 and the second electrode part 230 may include one or more electrodes. Figure 2 In the embodiment of the present invention, the first electrode portion 220 and the second electrode portion 230 each include an electrode.

[0080] The first and second electrode plates 220 and 230 are substantially consistent in shape with the piezoelectric portion 240 and extend along the surface of the piezoelectric portion 240. The first and second electrode plates 220 and 230 may further include an insulating layer between the battery surface and may be disposed on the battery surface through the insulating layer.

[0081] The first plate portion 220 can be grounded and the second plate portion 230 can be used as an electrode for detecting charge changes. For example, the second plate portion 230 can be connected to a detection circuit, and the charge change of the second plate portion 230 is detected by the detection circuit. When the battery is deformed, the piezoelectric portion 240 will deform accordingly, and the piezoelectric portion 240 will generate a predetermined amount of charge based on the deformation amount, and the charge is accumulated on the second plate portion 230, so that the formed charge can be detected by the detection circuit. Because the charge amount detected by the detection circuit can represent the deformation amount of the piezoelectric portion 240, it can correspondingly represent the deformation amount of the battery.

[0082] In another example, the second electrode portion 230 can be grounded and the first electrode portion 220 can be used as an electrode for detecting charge changes. For example, the first electrode portion 220 can be connected to a detection circuit, and the charge change of the first electrode portion 220 is detected by the detection circuit. When the battery is deformed, the piezoelectric portion 230 will deform accordingly, and the piezoelectric portion 240 will generate a predetermined amount of charge based on the deformation amount, and the charge is accumulated on the first electrode portion 220, so that the formed charge can be detected by the detection circuit. Because the charge amount detected by the detection circuit can represent the deformation amount of the piezoelectric portion 240, it can correspondingly represent the deformation amount of the battery.

[0083] Figure 3 A schematic diagram of a battery safety detection device according to an embodiment of the present disclosure is shown. The battery safety detection device is disposed between two batteries 310 , and may include a first electrode portion 320 , a second electrode portion 330 , and a piezoelectric portion 340 .

[0084] The piezoelectric part 340 may generate electric charge according to the deformation of the battery 310. A first electrode part 320 and a second electrode part 330 are provided on both sides of the piezoelectric part 340. The first electrode part 320 and the second electrode part 330 may include one or more electrodes. Figure 3 In the embodiment of the present invention, the first electrode portion 320 may include a plurality of electrodes 320-1, 320-2, ..., and the second electrode portion 330 may include a plurality of electrodes 330-1, 330-2, .... Figure 3 As shown in FIG, the shape of the electrode is a square, but the shape may also be a rectangle, a rhombus, a triangle, a trapezoid, a T-shape, a circle, an ellipse, etc.

[0085] In addition, although Figure 3 It is shown that the first electrode plate portion 320 and the second electrode plate portion 330 include sixteen electrodes respectively, but those skilled in the art should understand that the first electrode plate portion 320 and the second electrode plate portion 330 can include any number of electrodes, and the arrangement of the electrodes can also be arbitrary.

[0086] The first electrode plate portion 320 and the second electrode plate portion 330 may further include an insulating layer between the first electrode plate portion 320 and the second electrode plate portion 330 and the battery surface, and may be disposed on the battery surface through the insulating layer.

[0087] The first plate portion 320 can be grounded and the second plate portion 330 can be used as an electrode for detecting charge changes. For example, the second plate portion 330 can be connected to a detection circuit, and the charge change of the second plate portion 330 is detected by the detection circuit. When the battery is deformed, the piezoelectric portion 340 will deform accordingly, and the piezoelectric portion 340 will generate a predetermined amount of charge based on the deformation amount, and the charge is accumulated on the second plate portion 330, so that the formed charge can be detected by the detection circuit. Because the amount of charge detected by the detection circuit can represent the deformation amount of the piezoelectric portion 340, it can correspondingly represent the deformation amount of the battery. Because the first plate portion 320 and the second plate portion 330 include a plurality of electrodes, it is possible to measure whether the battery is deformed by the first plate portion 320 and the second plate portion 330, and the deformation position can also be measured. Because the deformation is different, the amount of charge generated is also different. The amount of charge detected by the plurality of electrodes can measure the position of the deformation. The plurality of electrodes of the first plate portion 320 and the second plate portion 330 can be connected to the detection circuit for detection. In an optional embodiment of the present disclosure, one electrode may also be connected to one detection circuit, so that multiple detection circuits may be used to detect multiple electrodes simultaneously, so that deformation at different positions of the battery can be detected.

[0088] In another example, the second plate portion 330 can be grounded and the first plate portion 320 can be used as an electrode for detecting charge changes. For example, the first plate portion 320 can be connected to a detection circuit, and the charge change of the first plate portion 320 is detected by the detection circuit. When the battery is deformed, the piezoelectric portion 330 will deform accordingly, and the piezoelectric portion 340 will generate a predetermined amount of charge based on the deformation amount, and the charge is accumulated on the first plate portion 320, so that the formed charge can be detected by the detection circuit. Because the amount of charge detected by the detection circuit can represent the deformation amount of the piezoelectric portion 340, it can correspondingly represent the deformation amount of the battery. Because the first plate portion 320 and the second plate portion 330 include multiple electrodes, it is possible to measure whether the battery is deformed through the first plate portion 320 and the second plate portion 330, and the deformation position can also be measured. Because the deformation is different, the amount of charge generated is also different. The amount of charge detected by multiple electrodes can measure the position of the deformation. Multiple electrodes of the first plate portion 320 and the second plate portion 330 can be connected to the detection circuit for detection. In an optional embodiment of the present disclosure, one electrode may also be connected to one detection circuit, so that multiple detection circuits may be used to detect multiple electrodes simultaneously, so that deformation at different positions of the battery can be detected.

[0089] Figure 4 A schematic diagram of a battery safety detection device according to an embodiment of the present disclosure is shown. The battery safety detection device is disposed between two batteries 410 , and may include a first electrode portion 420 , a second electrode portion 430 , and a piezoelectric portion 440 .

[0090] The piezoelectric part 440 may generate electric charge according to the deformation of the battery 410. A first electrode part 420 and a second electrode part 430 are provided on both sides of the piezoelectric part 440. The first electrode part 420 and the second electrode part 430 may include one or more electrodes. Figure 4 In the embodiment of the present invention, the first electrode portion 420 may include a plurality of electrodes 420 - 1 , 420 - 2 , ..., and the second electrode portion 430 may include a plurality of electrodes 430 - 1 , 430 - 2 , .... The shape of the electrodes may be strip-shaped.

[0091] In addition, although Figure 4 It is shown that the first electrode plate portion 420 and the second electrode plate portion 430 include four electrodes respectively, but those skilled in the art should understand that the first electrode plate portion 420 and the second electrode plate portion 430 can include any number of electrodes, and the arrangement of the electrodes can also be arbitrary, as long as the electrodes of the first electrode plate portion 420 and the electrodes of the second electrode plate portion 430 form a predetermined angle, preferably 90 degrees.

[0092] The first electrode plate portion 420 and the second electrode plate portion 430 may further include an insulating layer between the first electrode plate portion 420 and the second electrode plate portion 430 and the battery surface, and may be disposed on the battery surface through the insulating layer.

[0093] The first plate portion 420 can be grounded and the second plate portion 430 can be used as an electrode for detecting charge changes. For example, the second plate portion 430 can be connected to a detection circuit, and the charge change of the second plate portion 430 is detected by the detection circuit. When the battery is deformed, the piezoelectric portion 440 will deform accordingly, and the piezoelectric portion 440 will generate a predetermined amount of charge based on the deformation amount, and the charge is accumulated on the second plate portion 430, so that the formed charge can be detected by the detection circuit. Because the amount of charge detected by the detection circuit can represent the deformation amount of the piezoelectric portion 440, it can correspondingly represent the deformation amount of the battery. When the battery is deformed, the piezoelectric portion 440 also deforms accordingly. The piezoelectric portion 440 generates a predetermined amount of charge according to the deformation. The position where the charge is generated will correspond to the position of the deformation. The electrode of the second plate portion 430 at or near the deformation position transmits the generated charge to the detection circuit. In this way, the position of the battery deformation will be detected. Multiple electrodes of the second plate portion 430 can be connected to an independent detection circuit. The detection circuit can determine the charge amount and position of multiple electrodes of the second electrode plate portion 430, so that the battery deformation at different positions can be detected simultaneously.

[0094] In another example, the second plate portion 430 can be grounded and the first plate portion 420 can be used as an electrode for detecting charge changes. For example, the first plate portion 420 can be connected to a detection circuit, and the charge change of the first plate portion 420 is detected by the detection circuit. When the battery is deformed, the piezoelectric portion 430 will deform accordingly, and the piezoelectric portion 440 will generate a predetermined amount of charge based on the deformation amount, and the charge is accumulated on the first plate portion 420, so that the formed charge can be detected by the detection circuit. Because the amount of charge detected by the detection circuit can represent the deformation amount of the piezoelectric portion 440, it can correspondingly represent the deformation amount of the battery. When the battery is deformed, the piezoelectric portion 440 also deforms accordingly. The piezoelectric portion 440 generates a predetermined amount of charge according to the deformation. The position where the charge is generated will correspond to the position of the deformation. The electrode of the first plate portion 420 at or near the deformation position transmits the generated charge to the detection circuit. In this way, the position of the battery deformation will be detected. Multiple electrodes of the first plate portion 420 can be connected to an independent detection circuit. The detection circuit can determine the charge amount and position of multiple electrodes of the second electrode plate portion 430, so that the battery deformation at different positions can be detected simultaneously.

[0095] Figure 5A schematic diagram of a battery safety detection device according to an embodiment of the present disclosure is shown. The battery safety detection device is disposed between two batteries 510 , and may include a first electrode portion 520 , a second electrode portion 530 , and a piezoelectric portion 540 .

[0096] The piezoelectric portion 540 may generate electric charge according to the deformation of the battery 510. A first electrode portion 520 and a second electrode portion 530 are provided on both sides of the piezoelectric portion 540. The first electrode portion 520 and the second electrode portion 530 may include one or more electrodes. Figure 5 In the embodiment of the present invention, the first electrode portion 520 may include a plurality of electrodes 520 - 1 , 520 - 2 , . . . , and the second electrode portion 530 may include one electrode.

[0097] In addition, although Figure 5 It is shown that the first electrode plate portion 520 and the second electrode plate portion 530 include four electrodes and one electrode respectively, but those skilled in the art should understand that the first electrode plate portion 520 and the second electrode plate portion 530 may include any number of electrodes and any shapes of electrodes.

[0098] The first electrode plate portion 520 and the second electrode plate portion 530 may further include an insulating layer between the first electrode plate portion 520 and the second electrode plate portion 530 and the battery surface, and may be disposed on the battery surface through the insulating layer.

[0099] The first plate portion 520 can be grounded and the second plate portion 530 can be used as an electrode for detecting charge changes. For example, the second plate portion 530 can be connected to a detection circuit, and the charge change of the second plate portion 530 is detected by the detection circuit. When the battery is deformed, the piezoelectric portion 540 will deform accordingly, and the piezoelectric portion 540 will generate a predetermined amount of charge based on the deformation amount, and the charge is accumulated on the second plate portion 530, so that the formed charge can be detected by the detection circuit. Because the amount of charge detected by the detection circuit can represent the deformation amount of the piezoelectric portion 540, it can correspondingly represent the deformation amount of the battery. When the battery is deformed, the piezoelectric portion 540 also deforms accordingly. The piezoelectric portion 540 generates a predetermined amount of charge according to the deformation. The position where the charge is generated will correspond to the position of the deformation. The electrode of the second plate portion 530 at or near the deformation position transmits the generated charge to the detection circuit. In this way, the position of the battery deformation will be detected. Multiple electrodes of the second plate portion 530 can be connected to an independent detection circuit. The detection circuit can determine the charge amount and position of multiple electrodes of the second electrode plate portion 530, so that the battery deformation at different positions can be detected simultaneously.

[0100] In another example, the second plate portion 530 can be grounded and the first plate portion 520 can be used as an electrode for detecting charge changes. For example, the first plate portion 520 can be connected to a detection circuit, and the charge change of the first plate portion 520 is detected by the detection circuit. When the battery is deformed, the piezoelectric portion 540 will deform accordingly, and the piezoelectric portion 540 will generate a predetermined amount of charge based on the deformation amount, and the charge is accumulated on the first plate portion 520, so that the formed charge can be detected by the detection circuit. Because the amount of charge detected by the detection circuit can represent the deformation amount of the piezoelectric portion 540, it can correspondingly represent the deformation amount of the battery. When the battery is deformed, the piezoelectric portion 540 also deforms accordingly. The piezoelectric portion 540 generates a predetermined amount of charge according to the deformation. The position where the charge is generated will correspond to the position of the deformation. The electrode of the first plate portion 520 at or near the deformation position transmits the generated charge to the detection circuit. In this way, the position of the battery deformation will be detected. Multiple electrodes of the first plate portion 520 can be connected to an independent detection circuit. The detection circuit can determine the charge amount and position of multiple electrodes of the second electrode plate portion 530, so that the battery deformation at different positions can be detected simultaneously.

[0101] Figure 6 A schematic diagram of a battery safety detection device according to an embodiment of the present disclosure is shown. The battery safety detection device is disposed between two batteries 610 , and may include a first electrode portion 620 , a second electrode portion 630 , and a piezoelectric portion 640 .

[0102] The piezoelectric part 640 may generate electric charge according to the deformation of the battery 610. A first electrode part 620 and a second electrode part 630 are provided on both sides of the piezoelectric part 640. The first electrode part 620 and the second electrode part 630 may include one or more electrodes. Figure 6 In the embodiment of the present invention, the first electrode portion 620 may include a plurality of electrodes 620 - 1 , 620 - 2 , . . . , and the second electrode portion 630 may include one electrode.

[0103] In addition, although Figure 6 It is shown that the first electrode portion 620 and the second electrode portion 630 include sixteen electrodes and one electrode respectively, but those skilled in the art should understand that the first electrode portion 620 and the second electrode portion 630 can include any number of electrodes, and the arrangement of the electrodes can also be arbitrary.

[0104] The first electrode plate portion 620 and the second electrode plate portion 630 may further include an insulating layer between the first electrode plate portion 620 and the second electrode plate portion 630 and the battery surface, and may be disposed on the battery surface through the insulating layer.

[0105] The first plate portion 620 can be grounded and the second plate portion 630 can be used as an electrode for detecting charge changes. For example, the second plate portion 630 can be connected to a detection circuit, and the charge change of the second plate portion 630 is detected by the detection circuit. When the battery is deformed, the piezoelectric portion 640 will deform accordingly, and the piezoelectric portion 640 will generate a predetermined amount of charge based on the deformation amount, and the charge is accumulated on the second plate portion 630, so that the formed charge can be detected by the detection circuit. Because the amount of charge detected by the detection circuit can represent the deformation amount of the piezoelectric portion 640, it can correspondingly represent the deformation amount of the battery. When the battery is deformed, the piezoelectric portion 640 also deforms accordingly. The piezoelectric portion 640 generates a predetermined amount of charge according to the deformation. The position where the charge is generated will correspond to the position of the deformation. The electrode of the second plate portion 630 at or near the deformation position transmits the generated charge to the detection circuit. In this way, the position of the battery deformation will be detected. Multiple electrodes of the second plate portion 630 can be connected to an independent detection circuit. The detection circuit can determine the charge amount and position of multiple electrodes of the second electrode plate portion 630, so that the battery deformation at different positions can be detected simultaneously.

[0106] In another example, the second plate portion 630 can be grounded and the first plate portion 620 can be used as an electrode for detecting charge changes. For example, the first plate portion 620 can be connected to a detection circuit, and the charge change of the first plate portion 620 is detected by the detection circuit. When the battery is deformed, the piezoelectric portion 640 will deform accordingly, and the piezoelectric portion 640 will generate a predetermined amount of charge based on the deformation amount, and the charge is accumulated on the first plate portion 620, so that the formed charge can be detected by the detection circuit. Because the amount of charge detected by the detection circuit can represent the deformation amount of the piezoelectric portion 640, it can correspondingly represent the deformation amount of the battery. When the battery is deformed, the piezoelectric portion 640 also deforms accordingly. The piezoelectric portion 640 generates a predetermined amount of charge according to the deformation. The position where the charge is generated will correspond to the position of the deformation. The electrode of the first plate portion 620 at or near the deformation position transmits the generated charge to the detection circuit. In this way, the position of the battery deformation will be detected. Multiple electrodes of the first plate portion 620 can be connected to an independent detection circuit. The detection circuit can determine the charge amount and position of multiple electrodes of the second electrode plate portion 630, so that the battery deformation at different positions can be detected simultaneously.

[0107] Figure 7A schematic diagram of a battery safety detection device according to an embodiment of the present disclosure is shown. The battery safety detection device is arranged between two batteries 710, and the battery safety detection device may include a first electrode portion 720-1, a second electrode portion 730-1, and a piezoelectric portion 740-1; and a first electrode portion 720-2, a second electrode portion 730-2, and a piezoelectric portion 740-2. The first electrode portion 720-1, the second electrode portion 730-1, and the piezoelectric portion 740-1 may constitute a first battery safety detection device, and the first electrode portion 720-2, the second electrode portion 730-2, and the piezoelectric portion 740-2 may constitute a second battery safety detection device. An insulating layer may be provided between the first battery safety detection device and the second battery safety detection device.

[0108] The piezoelectric parts 740-1 and 740-2 can generate charges according to the deformation of the battery 710. The first electrode part 720-1 and the second electrode part 730-1 are disposed on both sides of the piezoelectric part 740-1, and the first electrode part 720-2 and the second electrode part 730-2 are disposed on both sides of the piezoelectric part 740-2.

[0109] The first electrode plate portion 720-1 may further include an insulating layer between the first electrode plate portion 720-1 and the battery surface, and may be disposed on the battery surface through the insulating layer. The second electrode plate portion 730-2 may further include an insulating layer between the first electrode plate portion 720-1 and the battery surface, and may be disposed on the battery surface through the insulating layer.

[0110] The first battery safety detection device and the second battery safety detection device can be used to measure different physical quantities. For example, the first battery safety detection device can be used to detect deformation, and the second battery safety detection device can be used to measure the change in charge caused by acceleration.

[0111] The shapes and arrangements of the first electrode plates 720 - 1 , 720 - 2 and the second electrode plates 730 - 1 , 730 - 2 may refer to the above description and will not be repeated here.

[0112] Figure 8 A schematic diagram of a battery safety detection device according to an embodiment of the present disclosure is shown. The battery safety detection device is disposed between two batteries 810, and the battery safety detection device may include a first plate portion 820, a first piezoelectric portion 830, a second plate portion 840, a second piezoelectric portion 850, and a third plate portion 860. The first plate portion 820, the first piezoelectric portion 830, and the second plate portion 840 may constitute a first battery safety detection device, and the second plate portion 840, the second piezoelectric portion 850, and the third plate portion 860 may constitute a second battery safety detection device.

[0113] The first piezoelectric part 830 and the second piezoelectric part 850 can generate electric charge according to the deformation of the battery 810. An insulating layer can be further included between the first electrode part 820 and the battery surface, and can be arranged on the battery surface through the insulating layer. An insulating layer can be further included between the third electrode part 860 and the battery surface, and can be arranged on the battery surface through the insulating layer.

[0114] The first battery safety detection device and the second battery safety detection device can be used to measure different physical quantities. For example, the first battery safety detection device can be used to detect deformation, and the second battery safety detection device can be used to measure the change in charge caused by acceleration.

[0115] The shapes and arrangements of the first electrode portion 820 , the second electrode portion 840 , and the third electrode portion 860 may refer to the above description and will not be described in detail herein.

[0116] exist Figure 7 and Figure 8 In the example, two battery safety detection devices are respectively provided to detect different physical quantities. However, in the present disclosure, one battery safety detection device may also be provided to detect different physical quantities.

[0117] Fig. 9 A schematic diagram of a battery safety detection device according to an embodiment of the present disclosure is shown. Fig. 9 The first electrode portion 920 and the second electrode portion 930 are shown in the form of strip electrodes. However, other forms of electrodes described above may also be used.

[0118] exist Fig. 9 In the embodiment, the first electrode portion 920 and the second electrode portion 930 are arranged on both sides of the piezoelectric portion, and the first electrode portion 920 is arranged on the surface of one battery, and the second electrode portion 930 is arranged on the surface of another battery. For other structures, please refer to the above description.

[0119] The first plate portion 920 includes two electrodes (a shadow electrode and a white electrode), and the second plate portion 930 includes two electrodes (a shadow electrode and a white electrode). The first plate portion 920 and the second plate portion 930 are respectively connected to two switching circuits. The two switching circuits are respectively connected to the ground terminal and the detection circuit. The two electrodes of the first plate portion 920 are switched to be connected to the ground terminal or to the detection circuit by the switching circuit, and the two electrodes of the second plate portion 930 are switched to be connected to the ground terminal or to the detection circuit by the switching circuit.

[0120] When detecting deformation caused by battery bulging, the shadow electrode of the first electrode plate portion 920 can be connected to the ground terminal through the switching circuit, and the shadow electrode of the second electrode plate portion 930 can be connected to the detection circuit through the switching circuit. When detecting deformation caused by external force, the white electrode of the first electrode plate portion 920 can be connected to the detection circuit through the switching circuit, and the white electrode of the second electrode plate portion 930 can be connected to the ground terminal through the switching circuit.

[0121] In addition, in the above description, the electrode can be connected to the ground terminal. In the present disclosure, a driving circuit can be used to replace the ground terminal. That is, the electrode connected to the ground terminal in the above description can be connected to the driving circuit instead of the ground terminal. The driving circuit provides an excitation signal to the electrode, and the detection circuit connected to the electrodes corresponding to these electrodes detects the change in the charge amount.

[0122] Fig.10 A schematic diagram of a detection control system of a battery safety detection device according to an embodiment of the present disclosure is shown. The memory is used to store data and detection control algorithms. The control logic provides the detection data to the memory or reads the detection control algorithm from the memory. The control logic can control the drive circuit to generate excitation signals of various frequencies and phases, which can be provided to the electrodes. The detection channel is used to selectively detect different electrodes and provide the detection signal to the control logic. The control logic can provide a channel selection signal to the detection signal.

[0123] In the battery safety detection device composed of the first electrode portion, the piezoelectric portion, and the second electrode portion used in the present disclosure, when the piezoelectric portion is subjected to an external force caused by deformation, charges of opposite polarity are generated on the first electrode portion and the second electrode portion, and when charges are accumulated on the surfaces of the two electrode portions, the battery safety detection device is equivalent to a capacitor. Further, in the present disclosure, the change in the amount of charge can be expressed as a voltage value. Fig.11 A schematic diagram of a detection circuit of a battery safety detection device according to an embodiment of the present disclosure is shown.

[0124] like Fig.11 As shown, by providing a driving signal 1110, a capacitor 1120 will be formed between the electrode of the first plate portion and the electrode of the second plate portion, and the voltage formed by the capacitor 1120 will be input to one input terminal of the amplifier 1130. The other input terminal of the amplifier 1130 can be connected to a reference voltage (the reference voltage can be realized by a voltage source and a reference capacitor). The output terminal of the amplifier 1130 and the one input terminal can be connected to a feedback capacitor 1140. Fig.11Although not shown in the figure, feedback resistors may also be connected in parallel to both ends of the feedback capacitor 1140. The reverse input of the amplifier is realized by a feedback capacitor or a parallel circuit of a feedback capacitor and a feedback resistor. The output end of the amplifier 1130 is connected to a multiplier 1150 so as to be multiplied by the oscillation signal formed by the oscillator 1160. For example, the drive signal may be a sinusoidal signal, and the output of the amplifier is also a sinusoidal signal accordingly. The sinusoidal signal output by the amplifier is multiplied by the oscillation signal of the oscillator to obtain an output signal, and the DC part in the output signal may be used to detect whether deformation occurs. The output signal of the multiplier 1150 may also be filtered via a filter 1170 to eliminate noise interference.

[0125] In addition, in order to eliminate interference such as external environment, a reference capacitor can also be set. Fig.12 A schematic diagram of a detection circuit according to an embodiment of the present disclosure is shown. Fig.12 and Fig.11 The difference is that Fig.12 A reference capacitor 1180 and a second drive circuit 1190 are added. The reference capacitor 1180 and the second drive circuit 1190 can be used to determine whether the voltage value measured by the inductive capacitor 1120 is accurate. For example, the second drive circuit 1190 can use a drive signal with the same phase and / or frequency as the drive signal 1110. When the second drive circuit 1190 applies the same drive signal, it can be determined whether the result obtained is the same as that of the drive signal 1110. If it is not the same, it is considered that there may be interference from external noise. The reference capacitor 1180 can be set on the plate portion, and can also be set on a printed circuit board.

[0126] In the description of this specification, the description with reference to the terms "one embodiment / method", "some embodiments / methods", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment / method or example are included in at least one embodiment / method or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment / method or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments / methods or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments / methods or examples described in this specification and the features of the different embodiments / methods or examples, unless they are contradictory.

[0127] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0128] Those skilled in the art should understand that the above embodiments are only for the purpose of clearly illustrating the present disclosure, and are not intended to limit the scope of the present disclosure. For those skilled in the art, other changes or modifications may 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: include: A first piezoelectric portion, wherein the first piezoelectric portion generates a changing charge according to the battery deformation, and when the battery is deformed, the first piezoelectric portion is deformed so that the charge generated by the first piezoelectric portion changes; a first electrode portion, the first electrode portion being disposed on one side of the first piezoelectric portion and coupled to the first piezoelectric portion; a second electrode portion, the second electrode portion being disposed on the other side of the first piezoelectric portion and coupled to the first piezoelectric portion; as well as A detection unit, wherein the detection unit detects the charge generated by the first piezoelectric unit between the first electrode plate unit and the second electrode plate unit, and the detection unit connected to the first electrode plate unit or the second electrode plate unit detects the change in charge of the first piezoelectric unit by detecting the change in capacitance between the first electrode plate unit and the second electrode plate unit, thereby detecting the deformation of the battery; The detection unit includes: a first drive circuit, which applies an excitation signal to one of the first and second electrode plates, and receives the induced voltage generated by the inductive capacitor through the other electrode plate; an amplifier, one input end of which is connected to the induced voltage, and the other input end of which is connected to the reference voltage; an oscillator, which generates an oscillation signal; a multiplier, which multiplies the oscillation signal with the output signal of the amplifier, and the DC part of the output signal of the multiplier is used to detect battery deformation; a reference capacitor, one end of which is connected to an input end of the amplifier; a second drive circuit, which provides a drive signal to the other end of the reference capacitor, and the phases and / or frequencies of the drive signals provided by the first and second drive circuits are the same, and the reference capacitor and the second drive circuit are used to judge whether the voltage value measured by the inductive capacitor is accurate. The first plate portion and the second plate portion include a first type electrode and a second type electrode, respectively. The first type electrode of the first plate portion and the first type electrode of the second plate portion measure one type of deformation, and the second type electrode of the first plate portion and the second type electrode of the second plate portion measure another type of deformation.

2. The battery safety detection device according to claim 1, characterized in that: The battery safety detection device is located between two adjacent batteries or between an outer casing accommodating multiple batteries and the batteries. In the case where the battery safety detection device is located between two adjacent batteries, the first electrode portion is located on the surface of one battery, and the second electrode portion is located on the surface of the other battery, and In the case where the battery safety detection device is located between an outer shell accommodating a plurality of batteries and the batteries, the first electrode plate portion is located on a surface of one battery, and the second electrode plate portion is located on a surface of the outer shell.

3. The battery safety detection device according to claim 2, characterized in that: An insulating layer is provided between the first electrode portion and the surface of the one battery, and an insulating layer is provided between the second electrode portion and the surface of the other battery or the surface of the outer shell.

4. The battery safety detection device according to claim 1, characterized in that: The first electrode plate portion includes a plurality of electrodes, the second electrode plate portion includes a plurality of electrodes, and the electrodes of the first electrode plate portion are arranged corresponding to the electrodes of the second electrode plate portion.

5. The battery safety detection device according to claim 4, characterized in that: The shapes of the electrode of the first electrode plate portion and the electrode of the second electrode plate portion are circular, elliptical, square, rectangular, diamond or triangular.

6. The battery safety detection device according to claim 1, characterized in that: The first electrode portion and the second electrode portion respectively include a plurality of strip electrodes, and the strip electrodes of the first electrode portion and the strip electrodes of the second electrode portion extend in different directions.

7. The battery safety detection device according to claim 1, characterized in that: The battery safety detection device also includes: a second piezoelectric portion, one side of which is disposed on one side of the second electrode portion and coupled to the second electrode portion, and one side of the second electrode portion is opposite to a side of the second electrode portion coupled to the first piezoelectric portion; and A third electrode portion, one side of which is disposed on the other side of the second piezoelectric portion and coupled to the second piezoelectric portion.

8. The battery safety detection device according to claim 7, characterized in that: The first electrode portion, the first piezoelectric portion, and the second electrode portion are used to detect one type of battery deformation, and the second electrode portion, the second piezoelectric portion, and the third electrode portion are used to detect another type of battery deformation.

9. The battery safety detection device according to claim 7, characterized in that: The battery safety detection device is located between two adjacent batteries or between an outer casing accommodating multiple batteries and the batteries. In the case where the battery safety detection device is located between two adjacent batteries, the first electrode portion is located on the surface of one battery, and the third electrode portion is located on the surface of another battery, and In the case where the battery safety detection device is located between an outer shell accommodating a plurality of batteries and the batteries, the first electrode plate portion is located on a surface of one battery, and the third electrode plate portion is located on a surface of the outer shell.

10. The battery safety detection device according to claim 9, characterized in that: An insulating layer is provided between the first electrode portion and the surface of the one battery, and an insulating layer is provided between the third electrode portion and the surface of the other battery or the surface of the outer shell.

11. The battery safety detection device according to claim 7, characterized in that: The first electrode portion includes a plurality of electrodes, the second electrode portion includes a plurality of electrodes, the third electrode portion includes a plurality of electrodes, and the electrodes of the first electrode portion, the second electrode portion, and the third electrode portion are arranged correspondingly.

12. The battery safety detection device according to claim 11, characterized in that: The electrodes of the first electrode plate portion, the second electrode plate portion and the third electrode plate portion are in a shape of a circle, an ellipse, a square, a rectangle, a rhombus or a triangle.

13. The battery safety detection device according to claim 10, characterized in that: The first electrode portion, the second electrode portion and the third electrode portion respectively include a plurality of strip electrodes, the strip electrodes of the first electrode portion and the strip electrodes of the second electrode portion extend in different directions, and the strip electrodes of the third electrode portion and the strip electrodes of the second electrode portion extend in different directions.

14. The battery safety detection device according to claim 1, characterized in that: The first electrode portion and / or the second electrode portion includes more than two electrodes, and the battery safety detection device includes more than two detection portions, each detection portion is respectively connected to a different electrode among the more than two electrodes of the first electrode portion and / or the second electrode portion.

15. The battery safety detection device according to claim 1, characterized in that: The detection unit further includes a filter connected to an output end of the multiplier.

16. A battery management system for measuring battery deformation, characterized in that: include: The battery safety detection device according to any one of claims 1 to 15; a channel selection circuit, the channel selection circuit being used to select one of the plurality of electrodes of the first electrode portion or the second electrode portion for measurement; as well as A control logic is provided, the control logic being configured to provide a channel selection signal to the channel selection circuit and to receive a detection signal from the channel selection circuit.

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