Measuring device, battery safety management device, and battery safety management device

Abstract

The present disclosure provides a measuring device, including: an excitation circuit configured to provide an excitation signal, a conversion circuit configured to perform conversion for output, and a processing circuit configured to process according to the output of the conversion circuit so as to monitor the safety of the battery / battery pack and / or calculate the power of the battery / battery pack. The present disclosure also provides a battery safety management system and device.

Description

Technical Field

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

[0002] During the use of rechargeable batteries such as lithium batteries, as the battery ages, the electrochemical materials inside the battery will change, and bulges and other deformations will form on the surface of the battery. If the deformation of the battery exceeds a certain degree, it may explode, causing inevitable losses.

[0003] Currently, in the measurement of battery deformation, the piezoelectric method is usually used. However, for the piezoelectric method, the cost is high, and the measurement accuracy is not high. If the measurement accuracy is improved (such as measuring the entire battery surface), the cost of the battery will inevitably increase greatly.

[0004] After measuring with a front-end sensor, how to process the measurement signal to accurately obtain the deformation amount of the battery is also a technical problem to be solved in this field. Summary of the Invention

[0005] To solve one of the above technical problems, the present disclosure provides a measuring device, a battery safety management device and a battery safety management system. According to the technical solution of the present disclosure, the shape change amount of the battery can be accurately and effectively measured.

[0006] According to one aspect of the present disclosure, a measuring device includes:

[0007] An excitation circuit for providing an excitation signal, and the excitation signal is provided to a capacitor plate portion so that the capacitor plate portion generates an induced voltage according to the induced capacitance of the capacitor plate portion. The capacitor plate portion is disposed on the outer surface or the inner surface of the battery / battery pack or is disposed at a certain distance from the battery / battery pack. The capacitor plate portion can sense a change in capacitance when the battery / battery pack undergoes a shape change.

[0008] A sampling capacitor that can receive the charge generated by the induced capacitance after the capacitor plate portion is excited, and the sampling capacitor can reflect the induced voltage of the induced capacitance after receiving the charge.

[0009] A conversion circuit for converting the voltage of the sampling capacitor for output; and

[0010] A processing circuit for processing according to the output of the conversion circuit to monitor the safety of the battery / battery pack and / or calculate the power of the battery / battery pack.

[0011] After the acquisition capacitor receives charge from the induction capacitor, the voltage of the acquisition capacitor can be adjusted to obtain the voltage value of the acquisition capacitor, and the voltage value of the induction capacitor is obtained based on the voltage value of the acquisition capacitor, so as to obtain the shape change amount of the battery / battery pack.

[0012] According to at least one embodiment of the present disclosure, the excitation signal is a constant voltage signal or a pulse width signal.

[0013] According to at least one embodiment of the present disclosure, the adjustment of the voltage of the acquisition capacitor is controlled according to the output of the conversion circuit.

[0014] According to at least one embodiment of the present disclosure, the measuring device further includes a control circuit and an application circuit. The control circuit generates a control signal according to the output of the conversion circuit, and the application circuit can apply different voltages to the acquisition capacitor to increase or decrease the voltage value of the acquisition capacitor.

[0015] According to at least one embodiment of the present disclosure, the application circuit includes a first switch and a second switch. The first switch and the second switch are controlled by the control signal to be turned on or off. When the first switch is turned on, a first voltage is applied to the acquisition capacitor to reduce the voltage value of the acquisition capacitor. When the second switch is turned on, a second voltage is applied to the acquisition capacitor to increase the voltage value of the acquisition capacitor.

[0016] According to at least one embodiment of the present disclosure, the capacitance value of the induction capacitor is one or more orders of magnitude larger than the capacitance value of the acquisition capacitor.

[0017] According to at least one embodiment of the present disclosure, a standard capacitor is further included. The standard capacitor is connected to the first switch and the second switch. The first voltage or the second voltage is applied to the standard capacitor to charge the standard capacitor, and the increase or decrease of the voltage value of the acquisition capacitor is realized through the charge transfer between the standard capacitor and the acquisition capacitor.

[0018] According to at least one embodiment of the present disclosure, a standard resistor is further included. The standard resistor is connected to the first switch and the second switch. When the first switch is turned on, a first current is provided to the acquisition capacitor through the first voltage and the standard resistor to reduce the voltage value of the acquisition capacitor. When the second switch is turned on, a second current is provided to the acquisition capacitor through the second voltage and the standard resistor to increase the voltage value of the acquisition capacitor.

[0019] According to at least one embodiment of the present disclosure, when the voltage value of the acquisition capacitor is decreased or increased, the voltage value of the acquisition capacitor is made equal to or close to the threshold voltage.

[0020] According to at least one embodiment of the present disclosure, the conversion circuit includes a comparator that compares the voltage of the acquisition capacitor with the threshold voltage and outputs a detection signal based on the voltage of the acquisition capacitor and the threshold voltage.

[0021] According to at least one embodiment of the present disclosure, the number of comparators is multiple, and each comparator corresponds to a different threshold voltage, so as to compare the voltage of the acquisition capacitor with different threshold voltages, thereby determining the range of the threshold voltage where the voltage of the acquisition capacitor is located.

[0022] According to at least one embodiment of the present disclosure, after determining the range of the threshold voltage where the voltage of the acquisition capacitor is located, the voltage of the acquisition capacitor is decreased or increased to make the voltage of the acquisition capacitor equal to or close to one of the different threshold voltages.

[0023] According to at least one embodiment of the present disclosure, the acquisition capacitor receives charge from the induction capacitor multiple times.

[0024] According to at least one embodiment of the present disclosure, the induced voltage of the induction capacitor is determined based on the voltage of the excitation signal, the output of the conversion circuit, the number of receptions, and the ratio of the acquisition capacitor to the induction capacitor, and thus the amount of shape change of the battery / battery pack is determined based on the determined induced voltage.

[0025] According to at least one embodiment of the present disclosure, the conversion circuit includes an analog-to-digital converter that converts the voltage of the acquisition capacitor into a digital signal and adjusts the voltage of the acquisition capacitor based on the digital signal.

[0026] According to at least one embodiment of the present disclosure, a filter circuit is further included, and the filter circuit is used to perform filtering processing on the output of the conversion circuit.

[0027] According to another aspect of the present disclosure, a battery safety management device includes the measurement device as described above.

[0028] According to another aspect of the present disclosure, a battery safety management system includes:

[0029] The measurement device as described in any one of the above; and

[0030] The capacitor plate part is arranged on the outer surface or the inner surface of the battery / battery pack or is arranged at a certain distance from the battery / battery pack.

[0031] Wherein, the measuring device obtains the shape change amount of the battery / battery pack by measuring the induced voltage of the capacitor plate part.

[0032] According to at least one embodiment of the present disclosure, the capacitor plate part includes a first capacitor plate part and a second capacitor plate part, and the first capacitor plate part and the second capacitor plate part are arranged at a predetermined distance. When the shape of the battery / battery pack changes, the mutual capacitance between the first capacitor plate part and the second capacitor plate part changes.

[0033] According to at least one embodiment of the present disclosure, the measuring device obtains the shape change amount of the battery / battery pack by measuring the induced voltage of the self-capacitance of the capacitor plate part.

[0034] According to at least one embodiment of the present disclosure, an overvoltage protection unit is further included, and the overvoltage protection unit adjusts the overvoltage threshold according to the shape change amount of the battery / battery pack.

[0035] According to at least one embodiment of the present disclosure, an overcurrent protection unit is further included, and the overcurrent protection unit adjusts the overcurrent threshold according to the shape change amount of the battery / battery pack.

[0036] According to at least one embodiment of the present disclosure, a power calculation unit is further included, and the power calculation unit calculates the power of the battery / battery pack according to the shape change amount of the battery / battery pack. Description of the Drawings

[0037] The drawings illustrate exemplary embodiments of the present disclosure and are used together with the description to explain the principles of the present disclosure. These drawings are included to provide a further understanding of the present disclosure, and the drawings are included in this specification and form a part of this specification.

[0038] Figure 1 A schematic diagram of a battery pack according to an embodiment of the present disclosure is shown.

[0039] Figure 2 A schematic diagram of a battery safety detection device according to an embodiment of the present disclosure is shown.

[0040] Figure 3 A schematic diagram of a battery safety detection device according to an embodiment of the present disclosure is shown.

[0041] Figure 4Shows a schematic diagram of a battery safety detection device according to an embodiment of the present disclosure.

[0042] Figure 5 Shows a schematic diagram of a battery safety detection device according to an embodiment of the present disclosure.

[0043] Figure 6 Shows a schematic diagram of a battery safety detection device according to an embodiment of the present disclosure.

[0044] Figure 7 Shows a schematic diagram of a battery safety detection device according to an embodiment of the present disclosure.

[0045] Figure 8 Shows a schematic diagram of a battery safety detection device according to an embodiment of the present disclosure.

[0046] Figure 9 Shows a schematic diagram of a measuring device of a battery safety detection device according to an embodiment of the present disclosure.

[0047] Figure 10 Shows a schematic diagram of a measuring device of a battery safety detection device according to an embodiment of the present disclosure.

[0048] Figure 11 Shows a schematic diagram of a measuring device of a battery safety detection device according to an embodiment of the present disclosure.

[0049] Figure 12 Shows a schematic diagram of a measuring device of a battery safety detection device according to an embodiment of the present disclosure.

[0050] Figure 13 Shows a schematic diagram of a measuring device of a battery safety detection device according to an embodiment of the present disclosure.

[0051] Figure 14 Shows a schematic diagram of a battery safety management system according to an embodiment of the present disclosure. Detailed implementation manners

[0052] The present disclosure will be further described in detail below in conjunction with the drawings and embodiments. It can be understood that the specific implementation manners described herein are only used to explain the relevant content and do not limit the present disclosure. Additionally, it should be noted that for the sake of convenience of description, only the parts related to the present disclosure are shown in the drawings.

[0053] 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 drawings and embodiments.

[0054] Unless otherwise specified, the illustrated exemplary embodiments are to 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. Accordingly, unless otherwise specified, the features of the various embodiments can be combined, separated, interchanged, and / or rearranged additionally without departing from the technical concept of the present disclosure.

[0055] In the drawings, cross-hatching and / or shading are generally used to clarify the boundaries between adjacent components. Thus, unless otherwise stated, the presence or absence of cross-hatching or shading does not convey or imply any preference or requirement regarding the specific materials, material properties, dimensions, proportions, commonality between the components shown, and / or any other characteristics, attributes, properties, etc. of the components. Additionally, in the drawings, the dimensions and relative dimensions of components may be exaggerated for clarity and / or descriptive purposes. When the exemplary embodiments can be implemented differently, the specific process orders may be performed in an order different from that described. For example, two consecutively described processes may be performed substantially simultaneously or in an order opposite to that described. Further, the same reference numerals denote the same components.

[0056] 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, directly connected to, or directly coupled to the other component, or there may be intervening components. However, when a component is referred to as being “directly on” another component, “directly connected to” or “directly coupled to” another component, there are no intervening components. For this reason, the term “connected” can refer to physical connection, electrical connection, etc., and can have or not have intervening components.

[0057] For descriptive purposes, the present disclosure may use spatial relative terms such as “under,” “below,” “beneath,” “underneath,” “above,” “on,” “over,” “upper,” and “side (e.g., as in “sidewall”)” to describe the relationship of one component to another (other) component as illustrated in the drawings. In addition to the orientation depicted in the drawings, the spatial relative terms are also intended to encompass different orientations of the device during use, operation, and / or manufacturing. For example, if the device in the drawings is flipped, a component described as “under” or “beneath” another component or feature will then be positioned “above” the other component or feature. Thus, the exemplary term “under” can encompass both the “above” and “under” orientations. Additionally, the device may be positioned otherwise (e.g., rotated 90 degrees or at other orientations), and accordingly, the spatial relative descriptors used herein are to be interpreted.

[0058] The terms used herein are for the purpose of describing particular embodiments and are not intended to be limiting. As used herein, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are also intended to include the plural forms. In addition, when the terms "comprise" and / or "include" and their variants are used in this specification, it is stated that there are the stated features, integers, steps, operations, components, assemblies, and / or groups thereof, but does not preclude the presence or addition of one or more other features, integers, steps, operations, components, assemblies, and / or groups thereof. It should also be noted that, as used herein, the terms "substantially", "about", and other similar terms are used as approximate terms and not as terms of degree, so they are used to explain the inherent deviations of measured values, calculated values, and / or provided values that would be recognized by those of ordinary skill in the art.

[0059] The present disclosure provides a battery safety detection device, wherein the battery safety detection device can be used at least to detect the deformation of a battery cell, 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 due to acceleration, etc.

[0060] Figure 1 A schematic diagram of a battery pack according to an embodiment of the present disclosure is shown. As Figure 1 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.

[0061] It should be noted that although a safety detection device for a plurality of batteries housed in the housing 150 is shown in Figure 1 , those skilled in the art should understand that the battery safety detection device of the present disclosure can also be used for other forms of battery structures, such as only setting a battery safety detection device (including the first electrode plate portion 120, the piezoelectric portion 130, and the second electrode plate portion 140) between two adjacent battery cells.

[0062] As Figure 1 shown, the battery safety detection device can be disposed between two adjacent batteries 110 or between a battery 110 and the housing 150.

[0063] The first electrode plate portion 120 can be a thin plate disposed on the surface of a battery 110, a thin film disposed on the surface of a battery 110, or a coating applied on the surface of a battery 110. The first electrode plate portion 120 can be a conductor, a semiconductor, or a conductive material. In addition, the first electrode plate portion 120 can also be formed by the aluminum foil used for battery packaging.

[0064] The second electrode plate portion 140 can be a thin plate disposed on the surface of an adjacent another battery 110, or can be a thin film disposed on the surface of another battery 110, or can also be a coating applied on the surface of another battery 110. The second electrode plate portion 140 can be a conductor, a semiconductor, or a conductive material. In addition, the second electrode plate portion 130 can also be formed of aluminum foil for battery packaging.

[0065] In addition, an insulating layer can be disposed between the first electrode plate portion 120 and the battery surface to prevent the first electrode plate portion 120 from forming a short circuit with the battery surface. An insulating layer can be disposed between the second electrode plate portion 140 and the battery surface to prevent the second electrode plate portion 140 from forming a short circuit with the battery surface. This insulating layer can also serve as an adhesive layer to bond the first electrode plate portion 120 and the second electrode plate portion 140 to the battery surface respectively.

[0066] The piezoelectric portion 130 is disposed between the first electrode plate portion 120 and the second electrode plate portion 140, and the piezoelectric portion can be a piezoelectric plate, a piezoelectric thin film, or can be a piezoelectric material coated between the first electrode plate portion 120 and / or the second electrode plate portion 140. The piezoelectric portion 130 can generate charges in response to the deformation of the battery, the charges can be conducted to the first electrode plate portion 120 or the second electrode plate portion 140, and the first electrode plate portion 120 and the second electrode plate portion 140 can be used to detect the generated charges, and transmit the charge information to the processing circuit through the interface connected to the first electrode plate portion 120 and the second electrode plate portion 140, so that the processing circuit determines the deformation applied to the piezoelectric portion 130 according to the generated charges.

[0067] In the following embodiments, a battery safety detection device disposed between two adjacent batteries will be taken as an example for description.

[0068] 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 the battery safety detection device can include a first electrode plate portion 220, a second electrode plate portion 230, and a piezoelectric portion 240.

[0069] The piezoelectric portion 240 can generate charges according to the deformation of the battery 210. The first electrode plate portion 220 and the second electrode plate portion 230 are disposed on both sides of the piezoelectric portion 240. The first electrode plate portion 220 and the second electrode plate portion 230 can include one or more electrodes. In Figure 2 the embodiment, the first electrode plate portion 220 and the second electrode plate portion 230 each include one electrode.

[0070] The first electrode plate portion 220 and the second electrode plate portion 230 are substantially the same in shape as the piezoelectric portion 240 and extend along the surface of the piezoelectric portion 240. An insulating layer may also be included between the first electrode plate portion 220 and the second electrode plate portion 230 and the battery surface, and they may be disposed on the battery surface through this insulating layer.

[0071] The first electrode plate portion 220 may be grounded and the second electrode plate portion 230 may be used as an electrode for detecting charge changes. For example, the second electrode plate portion 230 may be connected to a detection circuit, and the charge change of the second electrode plate portion 230 is detected through this detection circuit. When the battery is deformed, the piezoelectric portion 240 will be deformed accordingly. The piezoelectric portion 240 will generate a predetermined amount of charge based on the amount of deformation. The charge accumulates on the second electrode plate portion 230, and the charge thus formed can be detected by the detection circuit. Since the amount of charge detected by the detection circuit can represent the amount of deformation of the piezoelectric portion 240, it can accordingly represent the amount of deformation of the battery.

[0072] In another example, the second electrode plate portion 230 may be grounded and the first electrode plate portion 220 may be used as an electrode for detecting charge changes. For example, the first electrode plate portion 220 may be connected to a detection circuit, and the charge change of the first electrode plate portion 220 is detected through this detection circuit. When the battery is deformed, the piezoelectric portion 230 will be deformed accordingly. The piezoelectric portion 240 will generate a predetermined amount of charge based on the amount of deformation. The charge accumulates on the first electrode plate portion 220, and the charge thus formed can be detected by the detection circuit. Since the amount of charge detected by the detection circuit can represent the amount of deformation of the piezoelectric portion 240, it can accordingly represent the amount of deformation of the battery.

[0073] 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. The battery safety detection device may include a first electrode plate portion 320, a second electrode plate portion 330, and a piezoelectric portion 340.

[0074] The piezoelectric portion 340 can generate charge according to the deformation of the battery 310. The first electrode plate portion 320 and the second electrode plate portion 330 are disposed on both sides of the piezoelectric portion 340. The first electrode plate portion 320 and the second electrode plate portion 330 may include one or more electrodes. In Figure 3 the embodiment, the first electrode plate portion 320 may include a plurality of electrodes 320-1, 320-2, ……, and the second electrode plate portion 330 may include a plurality of electrodes 330-1, 330-2, ……. Among them, in Figure 3 it is shown that the shape of the electrode is square, but its shape may also be rectangular, rhombic, triangular, trapezoidal, T-shaped, circular, elliptical, etc.

[0075] In addition, although inFigure 3 It is shown that the first electrode plate portion 320 and the second electrode plate portion 330 each include sixteen electrodes. However, 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.

[0076] An insulating layer can also be included between the first electrode plate portion 320 and the second electrode plate portion 330 and the battery surface, and they can be disposed on the battery surface through this insulating layer.

[0077] The first electrode plate portion 320 can be grounded and the second electrode plate portion 330 can be used as an electrode for detecting charge changes. For example, the second electrode plate portion 330 can be connected to a detection circuit, and the charge change of the second electrode plate portion 330 can be detected through this detection circuit. When the battery deforms, the piezoelectric portion 340 will deform accordingly. The piezoelectric portion 340 will generate a predetermined amount of charge based on the amount of deformation. The charge accumulates on the second electrode plate portion 330, and the formed charge can be detected through the detection circuit. Since the amount of charge detected by the detection circuit can represent the amount of deformation of the piezoelectric portion 340, it can accordingly represent the amount of deformation of the battery. Since the first electrode plate portion 320 and the second electrode plate portion 330 include multiple electrodes, it is possible to measure whether the battery deforms and also measure the deformation position through the first electrode plate portion 320 and the second electrode plate portion 330. Because different deformations result in different amounts of generated charge. The position of the deformation can be measured through the amounts of charge detected by multiple electrodes. The multiple electrodes of the first electrode plate portion 320 and the second electrode plate portion 330 can all be connected to the detection circuit for detection. In an alternative embodiment of the present disclosure, one electrode can also be connected to one detection circuit, so that the simultaneous detection of multiple electrodes can be achieved through multiple detection circuits. In this way, the deformations at different positions of the battery can be detected.

[0078] In another example, the second plate portion 330 can be grounded and the first plate portion 320 can serve 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 can be detected through this detection circuit. When the battery is deformed, the piezoelectric portion 330 will be deformed accordingly, and the piezoelectric portion 340 will generate a predetermined amount of charge based on the amount of deformation. The charge accumulates on the first plate portion 320, and the formed charge can be detected by the detection circuit. Since the amount of charge detected by the detection circuit can represent the amount of deformation of the piezoelectric portion 340, it can accordingly represent the amount of deformation of the battery. Since the first plate portion 320 and the second plate portion 330 include multiple electrodes, it is possible to measure whether the battery is deformed and also measure the deformation position through the first plate portion 320 and the second plate portion 330. Because different deformations result in different amounts of generated charge. The position of the deformation can be measured by the amounts of charge detected by multiple electrodes. The multiple electrodes of the first plate portion 320 and the second plate portion 330 can all be connected to the detection circuit for detection. In an alternative embodiment of the present disclosure, one electrode can also be connected to one detection circuit, so that the multiple electrodes can be simultaneously detected through multiple detection circuits. In this way, the deformations at different positions of the battery can be detected.

[0079] Figure 4 FIG. shows a schematic diagram of a battery safety detection device according to an embodiment of the present disclosure. The battery safety detection device is disposed between two batteries 410, and the battery safety detection device may include a first plate portion 420, a second plate portion 430, and a piezoelectric portion 440.

[0080] The piezoelectric portion 440 can generate charge according to the deformation of the battery 410. The first plate portion 420 and the second plate portion 430 are disposed on both sides of the piezoelectric portion 440. The first plate portion 420 and the second plate portion 430 may include one or more electrodes. In Figure 4 the embodiment, the first plate portion 420 may include multiple electrodes 420-1, 420-2,..., and the second plate portion 430 may include multiple electrodes 430-1, 430-2,.... The shape of the electrodes can be strip-shaped.

[0081] In addition, although in Figure 4 it is shown that the first plate portion 420 and the second plate portion 430 respectively include four electrodes, those skilled in the art should understand that the first plate portion 420 and the second plate portion 430 can include any number of electrodes, and the arrangement manner of the electrodes can also be arbitrary, as long as the electrodes of the first plate portion 420 and the electrodes of the second plate portion 430 form a predetermined angle, preferably 90 degrees.

[0082] An insulating layer may also be included between the first electrode plate portion 420 and the second electrode plate portion 430 and the battery surface, and they may be disposed on the battery surface through this insulating layer.

[0083] The first electrode plate portion 420 may be grounded and the second electrode plate portion 430 may be used as an electrode for detecting charge changes. For example, the second electrode plate portion 430 may be connected to a detection circuit, and the charge change of the second electrode plate portion 430 is detected through this detection circuit. When the battery deforms, the piezoelectric portion 440 will deform accordingly. The piezoelectric portion 440 will generate a predetermined amount of charge based on the amount of deformation. The charge accumulates on the second electrode plate portion 430, and the formed charge can be detected through the detection circuit. Since the amount of charge detected by the detection circuit can represent the amount of deformation of the piezoelectric portion 440, it can correspondingly represent the amount of deformation of the battery. When the battery deforms, 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 electrodes of the second electrode plate portion 430 at or near the deformation position transmit the generated charge to the detection circuit. In this way, the position of the battery deformation will be detected. Multiple electrodes of the second electrode plate portion 430 may be connected to independent detection circuits. The detection circuit can determine the amount of charge and the position of multiple electrodes of the second electrode plate portion 430, so that the battery deformations at different positions can be detected simultaneously.

[0084] In another example, the second electrode plate portion 430 may be grounded and the first electrode plate portion 420 may be used as an electrode for detecting charge changes. For example, the first electrode plate portion 420 may be connected to a detection circuit, and the charge change of the first electrode plate portion 420 is detected through this detection circuit. When the battery deforms, the piezoelectric portion 430 will deform accordingly. The piezoelectric portion 440 will generate a predetermined amount of charge based on the amount of deformation. The charge accumulates on the first electrode plate portion 420, and the formed charge can be detected through the detection circuit. Since the amount of charge detected by the detection circuit can represent the amount of deformation of the piezoelectric portion 440, it can correspondingly represent the amount of deformation of the battery. When the battery deforms, 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 electrodes of the first electrode plate portion 420 at or near the deformation position transmit the generated charge to the detection circuit. In this way, the position of the battery deformation will be detected. Multiple electrodes of the first electrode plate portion 420 may be connected to independent detection circuits. The detection circuit can determine the amount of charge and the position of multiple electrodes of the second electrode plate portion 430, so that the battery deformations at different positions can be detected simultaneously.

[0085] Figure 5The figure shows a schematic diagram of a battery safety detection device according to an embodiment of the present disclosure. The battery safety detection device is disposed between two batteries 510. The battery safety detection device may include a first plate portion 520, a second plate portion 530, and a piezoelectric portion 540.

[0086] The piezoelectric portion 540 can generate charges according to the deformation of the battery 510. The first plate portion 520 and the second plate portion 530 are disposed on both sides of the piezoelectric portion 540. The first plate portion 520 and the second plate portion 530 may include one or more electrodes. In Figure 5 the embodiment, the first plate portion 520 may include a plurality of electrodes 520-1, 520-2, ……, and the second plate portion 530 may include one electrode.

[0087] In addition, although in Figure 5 it is shown that the first plate portion 520 and the second plate portion 530 respectively include four electrodes and one electrode, those skilled in the art should understand that the first plate portion 520 and the second plate portion 530 may include any number of electrodes and electrodes of any shape.

[0088] An insulating layer may also be included between the first plate portion 520 and the second plate portion 530 and the battery surface, and they may be disposed on the battery surface through this insulating layer.

[0089] The first plate portion 520 may be grounded and the second plate portion 530 may be used as an electrode for detecting charge changes. For example, the second plate portion 530 may be connected to a detection circuit, and the charge change of the second plate portion 530 is detected through this detection circuit. When the battery deforms, the piezoelectric portion 540 will deform accordingly. The piezoelectric portion 540 will generate a predetermined amount of charge based on the amount of deformation. The charge accumulates on the second plate portion 530, and the formed charge can be detected through the detection circuit. Since the amount of charge detected by the detection circuit can represent the amount of deformation of the piezoelectric portion 540, it can accordingly represent the amount of deformation of the battery. When the battery deforms, 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 electrodes of the second plate portion 530 at or near the deformation position transmit the generated charge to the detection circuit. In this way, the position of the battery deformation will be detected. The multiple electrodes of the second plate portion 530 may be connected to independent detection circuits. The detection circuit can determine the amount of charge and the position of the multiple electrodes of the second plate portion 530, so that the battery deformations at different positions can be detected simultaneously.

[0090] 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 can be detected through this detection circuit. When the battery deforms, the piezoelectric portion 540 will deform accordingly. The piezoelectric portion 540 will generate a predetermined amount of charge based on the amount of deformation. The charge accumulates on the first plate portion 520, and the formed charge can be detected by the detection circuit. Since the amount of charge detected by the detection circuit can represent the amount of deformation of the piezoelectric portion 540, it can accordingly represent the amount of deformation of the battery. When the battery deforms, 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 electrodes of the first plate portion 520 at or near the deformation position transmit the generated charge to the detection circuit. In this way, the position of the battery deformation can be detected. Multiple electrodes of the first plate portion 520 can be connected to independent detection circuits. The detection circuit can determine the amount of charge and the position of multiple electrodes of the second plate portion 530, so that the battery deformations at different positions can be detected simultaneously.

[0091] Figure 6 FIG. shows a schematic diagram of a battery safety detection device according to an embodiment of the present disclosure. The battery safety detection device is disposed between two batteries 610. The battery safety detection device may include a first plate portion 620, a second plate portion 630, and a piezoelectric portion 640.

[0092] The piezoelectric portion 640 can generate charge according to the deformation of the battery 610. The first plate portion 620 and the second plate portion 630 are disposed on both sides of the piezoelectric portion 640. The first plate portion 620 and the second plate portion 630 may include one or more electrodes. In Figure 6 the embodiment, the first plate portion 620 may include multiple electrodes 620-1, 620-2, ……, and the second plate portion 630 may include one electrode.

[0093] In addition, although in Figure 6 it is shown that the first plate portion 620 and the second plate portion 630 respectively include sixteen electrodes and one electrode, those skilled in the art should understand that the first plate portion 620 and the second plate portion 630 can include any number of electrodes, and the arrangement manner of the electrodes can also be arbitrary.

[0094] An insulating layer may further be included between the first plate portion 620 and the second plate portion 630 and the battery surface, and they can be disposed on the battery surface through this insulating layer.

[0095] The first electrode plate portion 620 can be grounded and the second electrode plate portion 630 can be used as an electrode for detecting charge changes. For example, the second electrode plate portion 630 can be connected to a detection circuit, and the charge changes of the second electrode plate portion 630 can be detected through this detection circuit. When the battery is deformed, the piezoelectric portion 640 will be deformed accordingly. The piezoelectric portion 640 will generate a predetermined amount of charge based on the amount of deformation. The charge accumulates on the second electrode plate portion 630, and the charge thus formed can be detected through the detection circuit. Since the amount of charge detected by the detection circuit can represent the amount of deformation of the piezoelectric portion 640, it can accordingly represent the amount of deformation of the battery. When the battery is deformed, the piezoelectric portion 640 is also deformed 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 electrodes of the second electrode plate portion 630 at or near the deformation position transmit the generated charge to the detection circuit. In this way, the position of the battery deformation can be detected. Multiple electrodes of the second electrode plate portion 630 can be connected to independent detection circuits. The detection circuit can determine the amount of charge and the position of multiple electrodes of the second electrode plate portion 630, so that the deformation of the battery at different positions can be detected simultaneously.

[0096] In another example, the second electrode plate portion 630 can be grounded and the first electrode plate portion 620 can be used as an electrode for detecting charge changes. For example, the first electrode plate portion 620 can be connected to a detection circuit, and the charge changes of the first electrode plate portion 620 can be detected through this detection circuit. When the battery is deformed, the piezoelectric portion 640 will be deformed accordingly. The piezoelectric portion 640 will generate a predetermined amount of charge based on the amount of deformation. The charge accumulates on the first electrode plate portion 620, and the charge thus formed can be detected through the detection circuit. Since the amount of charge detected by the detection circuit can represent the amount of deformation of the piezoelectric portion 640, it can accordingly represent the amount of deformation of the battery. When the battery is deformed, the piezoelectric portion 640 is also deformed 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 electrodes of the first electrode plate portion 620 at or near the deformation position transmit the generated charge to the detection circuit. In this way, the position of the battery deformation can be detected. Multiple electrodes of the first electrode plate portion 620 can be connected to independent detection circuits. The detection circuit can determine the amount of charge and the position of multiple electrodes of the second electrode plate portion 630, so that the deformation of the battery at different positions can be detected simultaneously.

[0097] Figure 7The figure shows a schematic diagram of a battery safety detection device according to an embodiment of the present disclosure. The battery safety detection device is disposed between two batteries 710. The battery safety detection device may include a first electrode plate portion 720-1, a second electrode plate portion 730-1, and a piezoelectric portion 740-1; and a first electrode plate portion 720-2, a second electrode plate portion 730-2, and a piezoelectric portion 740-2. Among them, the first electrode plate portion 720-1, the second electrode plate portion 730-1, and the piezoelectric portion 740-1 may form a first battery safety detection device, and the first electrode plate portion 720-2, the second electrode plate portion 730-2, and the piezoelectric portion 740-2 may form 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.

[0098] The piezoelectric portions 740-1 and 740-2 may generate charges according to the deformation of the battery 710. The first electrode plate portion 720-1 and the second electrode plate portion 730-1 are disposed on both sides of the piezoelectric portion 740-1, and the first electrode plate portion 720-2 and the second electrode plate portion 730-2 are disposed on both sides of the piezoelectric portion 740-2.

[0099] An insulating layer may further be included between the first electrode plate portion 720-1 and the battery surface, and it may be disposed on the battery surface through this insulating layer. An insulating layer may further be included between the second electrode plate portion 730-2 and the battery surface, and it may be disposed on the battery surface through this insulating layer.

[0100] The first battery safety detection device and the second battery safety detection device may be used to measure different physical quantities. For example, the first battery safety detection device may be used to detect deformation, and for example, the second battery safety detection device may be used to measure the change in the amount of charge caused by acceleration.

[0101] The shapes and arrangements of the first electrode plate portions 720-1, 720-2 and the second electrode plate portions 730-1, 730-2 may refer to the above description and will not be elaborated here.

[0102] Figure 8 The figure shows a schematic diagram of a battery safety detection device according to an embodiment of the present disclosure. The battery safety detection device is disposed between two batteries 810. The battery safety detection device may include a first electrode plate portion 820, a first piezoelectric portion 830, a second electrode plate portion 840, a second piezoelectric portion 850, and a third electrode plate portion 860. The first electrode plate portion 820, the first piezoelectric portion 830, and the second electrode plate portion 840 may form a first battery safety detection device, and the second electrode plate portion 840, the second piezoelectric portion 850, and the third electrode plate portion 860 may form a second battery safety detection device.

[0103] The first piezoelectric part 830 and the second piezoelectric part 850 can generate electric charges according to the deformation of the battery 810. An insulating layer may also be included between the first electrode plate part 820 and the battery surface, and it may be disposed on the battery surface through this insulating layer. An insulating layer may also be included between the third electrode plate part 860 and the battery surface, and it may be disposed on the battery surface through this insulating layer.

[0104] 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 for example, the second battery safety detection device can be used to measure the change in the amount of electric charge caused by acceleration.

[0105] The shapes and arrangements of the first electrode plate part 820, the second electrode plate part 840, and the third electrode plate part 860 can be referred to the above description and will not be elaborated here.

[0106] In Figure 7 and Figure 8 In the example of, two battery safety detection devices are respectively provided to detect different physical quantities. However, in the present disclosure, one battery safety detection device can also be provided to detect different physical quantities.

[0107] For the deformation measurement of the electrode plate part used to measure the battery deformation, it can be measured by the change in the induced capacitance of the electrode plate part. The induced capacitance can be self-capacitance or mutual capacitance.

[0108] When the shape of the electrode plate part changes, the mutual capacitance between the electrode plate parts will change, or the self-capacitance of one electrode plate changes. In addition, the change in the induced capacitance can be measured by the change in the output voltage of the electrode plate part.

[0109] In the above embodiments, although the case with a piezoelectric part is described, in the case without a piezoelectric part, either through the mutual capacitance between two electrode plate parts or the self-capacitance generated by one electrode plate, it can be applied to the following measurement device.

[0110] Figure 9 A measurement device according to an embodiment of the present disclosure is shown. As Figure 9 shown, the measurement device may include an excitation part and a measurement part.

[0111] The excitation circuit in the excitation part can provide an excitation signal to the electrode plate to be measured, and the excitation signal can be a pulse voltage signal or a fixed voltage signal.

[0112] In addition, in the case of collecting multiple induced voltages, a multiplexing circuit may also be included, and a suitable measured electrode plate can be selected through the selection function of the multiplexing circuit. When the measured electrode plate is selected, the excitation circuit will apply an excitation signal to the selected electrode plate, and thus the selected electrode plate will be charged. When detecting the selected electrode plate, the excitation of the excitation circuit is stopped, and the selected electrode plate is connected to the receiving circuit through the switch of the multiplexing circuit.

[0113] The receiving circuit may include a sampling capacitor, and when the sampling capacitor is connected to the selected electrode plate, the charge of the selected electrode plate will flow into the sampling capacitor. In the present disclosure, the capacitance value of the sampling capacitor is greater than the capacitance value of the induced capacitance of the selected electrode plate by one or more orders of magnitude, that is, the ratio of the capacitance values of the two is one or more orders of magnitude. Thus, after receiving the charge of the selected electrode plate through the sampling capacitor, it is equivalent to the voltage of the sampling capacitor multiplied by the order of magnitude of the two being equal to or approximately equal to the voltage formed after the selected electrode plate is excited by the excitation signal. For example, when a fixed voltage signal is used, the voltage of the sampling capacitor multiplied by the order of magnitude of the two will be equal to the voltage value of the fixed voltage signal. In addition, in the present disclosure, one or more excitation sampling periods may be adopted, and one sampling period includes one excitation and one detection. For example, in the case of adopting multiple excitation sampling periods, in the first period, a voltage is applied to the electrode plate and sampling is performed through the sampling capacitor; in the second period, a voltage is applied to the electrode plate again, and then sampling is performed through the sampling capacitor again;...; until the preset number of sampling periods is reached. Thus, if there are three sampling periods, the voltage value of the sampling capacitor can be multiplied by the difference in order of magnitude between the two and divided by three to obtain the voltage value generated by the induced capacitance.

[0114] The receiving circuit may include a conversion circuit to output a related value of the voltage of the sampling capacitor and provide it to a filtering circuit, and the filtering circuit can provide the filtered related value of the voltage of the sampling capacitor to a subsequent processing circuit.

[0115] During the output of the receiving circuit, the voltage value of the sampling capacitor can be compared with a threshold voltage through a comparator included in the receiving circuit. For example, when the voltage value is greater than the threshold voltage, the comparator outputs a high-level signal, and when the voltage value is lower than the threshold voltage, the comparator can output a low-level signal. In addition, the threshold voltage can be selected as a standard voltage or can be selected as the ground voltage.

[0116] In addition, the receiving circuit may include multiple comparators, and each comparator will correspond to a different threshold voltage. For example, the voltage value of the sampling capacitor can be successively compared with multiple comparators, that is, compared with multiple thresholds, so as to obtain which threshold the voltage value of the sampling capacitor is equal to or close to, and thus obtain the capacitance value of the sampling capacitor.

[0117] In addition, the measuring device may further include a control circuit and an application circuit, where the control circuit can control the application circuit according to the output of the receiving circuit. In the control circuit, control can be performed according to the signal output by the receiving circuit. For example, when the receiving circuit outputs a high level and a low level, the control circuit can perform different controls.

[0118] The application circuit can control the voltage / charge amount applied to the acquisition capacitor. In the present disclosure, an example of applying a voltage is used for illustration.

[0119] For example, when there is a comparator in the receiving circuit and multiple cycles are performed, charges from the electrode plates are accumulated in the acquisition capacitor multiple times, and correspondingly, the voltage generated by the induced capacitance of the electrode plates is reflected. Thus, in the sampling stage, the voltage value of the acquisition capacitor is compared with a threshold voltage. When the voltage value of the acquisition capacitor is greater than the threshold voltage, the receiving circuit will output a high-level signal, but at this time, the accurate capacitance value of the acquisition capacitor cannot be obtained. Therefore, in this case, the control circuit will generate a control signal according to the output high-level signal, and this control signal will be applied to the application circuit to adjust the voltage of the acquisition capacitor.

[0120] The number of times the voltage is applied by the application circuit can be once or multiple times. For example, in the case of a high-level signal, the control circuit controls the application circuit to apply a first reference voltage to the acquisition capacitor to reduce the voltage value of the acquisition capacitor. After applying it once, if the output of the receiving circuit is still a high-level signal, continue to apply the first reference voltage to the acquisition capacitor to continue reducing the voltage value of the acquisition capacitor,... until the output of the receiving circuit is a low-level signal. In this way, the accurate value of the voltage value of the acquisition capacitor can be calculated according to the threshold voltage input by the comparator, the applied first reference voltage, and the number of times the first reference voltage is applied.

[0121] For example, in the above case, if the first reference voltage is applied three times before the output of the receiving circuit changes from a high-level signal to a low-level signal. At this time, the accurate value of the voltage value of the acquisition capacitor can be the following relationship: the voltage value of the threshold voltage + the value of the first reference voltage * the number of applications. If in the present disclosure, a capacitor is charged / discharged through a first reference voltage, and then the change of the acquisition capacitor is realized through the charge sharing between this capacitor and the acquisition capacitor, when determining the accurate value of the voltage value of the acquisition capacitor, the capacitance ratio between this capacitor and the acquisition capacitor needs to be considered. The accurate value of the voltage value of the acquisition capacitor = the voltage value of the threshold voltage + (the value of a reference voltage * the number of applications) * the capacitance ratio. According to the method of the present disclosure, in this way, the voltage value of the acquisition capacitor can be measured with as few steps as possible.

[0122] In addition, when the output of the comparator is at a low level, it indicates that the voltage value of the acquisition capacitor is less than the threshold voltage input to the comparator. In this way, the control circuit can control the application circuit so that the voltage value of the acquisition capacitor increases until the output of the comparator is a high-level signal.

[0123] In addition, in the case where there are more than two comparators, it is possible to compare with different thresholds of the comparators. After the comparison is completed, the control circuit can control the application circuit to make the voltage value of the acquisition capacitor close to or equal to a certain threshold.

[0124] Through the above method, the voltage value of the acquisition capacitor can be accurately obtained, and thus the voltage value of the induction capacitor can be obtained accordingly. In this way, the deformation amount of the electrode plate can be obtained accordingly, and thus the deformation amount of the battery can be obtained.

[0125] Figure 10 FIG. shows a measuring device according to the present disclosure (illustrated by taking only one induction capacitor as an example), which corresponds to Figure 9 the block diagram described above.

[0126] According to Figure 9 and Figure 10 the measuring device described above can be used to detect the self-voltage of the electrode plate or the mutual voltage of the electrode plates. In Figure 10 , a charging voltage Va can be provided and applied to the electrode plate, so that the electrode plate capacitor accumulates charges, and thus the voltage value of the electrode plate capacitor C will be equal to the charging voltage Va. After the charging process is completed, the first switch S1 is disconnected and the second switch S2 is closed, so that the charges are transferred from the electrode plate capacitor C to the acquisition capacitor C1, where the capacitance value of the acquisition capacitor can be one or several orders of magnitude higher than the capacitance value of the electrode plate capacitor C.

[0127] The acquisition capacitor C1 receives the charges of the electrode plate capacitor C, so that the voltage value of the acquisition capacitor C1 will become a voltage, and the voltage value of this voltage will be equal to k*Va, where k is the ratio of the capacitance value of the electrode plate capacitor C to the capacitance value of the acquisition capacitor C1. Of course, those skilled in the art should understand that before receiving the charges of the electrode plate capacitor C, the switch connected in parallel at both ends of the acquisition capacitor can be used for discharging.

[0128] In Figure 10 , it is shown that the acquisition capacitor C1 is arranged between the ground and the output end of the electrode plate capacitor, but the acquisition capacitor C1 can also be arranged between one input end and the output end of the comparator CP1 (in the case of one comparator). Although three comparators are shown in Figure 1 , it can also be one comparator or other numbers of comparators.

[0129] In addition, multiple charging of the acquisition capacitor C1 can be achieved by opening or closing the first switch S1 and the second switch S2 multiple times. After n times like this, the voltage value of the acquisition capacitor C1 will become n * k * Va.

[0130] In the case where there is only one comparator, for example, only comparator CP1 exists, close the third switch S3, and compare the voltage of the acquisition capacitor C1 with the first threshold voltage V1. For example, when the voltage of the acquisition capacitor C1 is greater than the first threshold voltage V1, the comparator CP1 can output a high-level signal 1, and when it is less than the first threshold voltage V1, the comparator CP1 can output a low-level signal 0. The first control switch S6 and the second control switch S7 of the application circuit can be controlled according to the output of the comparator CP1.

[0131] In addition, in the case where there are multiple comparators, for example, as shown in the figure, when there are comparator CP1, comparator CP2, and comparator CP3, for example, the voltage of the acquisition capacitor C1 can be compared with the first threshold voltage V1 through the corresponding switch S3 of the comparator CP1. If it is detected at the output end of the comparator or the output end of the analog-to-digital conversion circuit that the voltage of the acquisition capacitor C1 is greater than the first threshold voltage V1 (for example, output a high level), then the switch S4 can be switched to conduct so that the voltage of the acquisition capacitor C1 is compared with the second threshold voltage V2. If it is still greater than the second threshold voltage V2, then the switch S5 can be continuously switched to conduct and compared with the third threshold voltage V3, and so on. In this way, it can be known between which two threshold voltages the voltage of the acquisition capacitor C1 is located through multiple comparators. For example, in the above case, V3 > V2 > V1. After knowing this, the switches S6 and S7 can be controlled to complete the corresponding work. For example, if it is known that it is between V3 and V2, then the switch S5 can be kept conducting, and the switches S6 and S7 can be controlled so that the voltage of the acquisition capacitor C1 is equal to or close to V3.

[0132] In addition, although a filter is shown connected after the comparator in the figure, it can be as Figure 10 shown, control the switches S6 and S7 according to the output of the comparator, or it can be as Figure 11As shown, the switches S6 and S7 are controlled according to the output of the filter. For example, when the comparator outputs a high-level signal, the first control switch S6 can be controlled to conduct, so as to apply a first reference voltage Vref1 to the acquisition capacitor C1, where the first reference voltage can be set to a voltage that can reduce the voltage of the acquisition capacitor C1, for example, it can be a negative voltage. When the comparator outputs a low-level signal, the second control switch S7 can be controlled to conduct, so as to apply a second reference voltage Vref2 to the acquisition capacitor C1, where the second reference voltage can be set to a voltage that can increase the voltage of the acquisition capacitor C1, for example, it can be a positive voltage. Where Vref1 can be equal to -Vref2.

[0133] In addition, as Figure 12 shown, a comparator CP1 can also be used, and one input terminal of this comparator can be connected to multiple threshold voltages. For example, three threshold voltages V1 to V3 are shown in the figure, and the threshold voltage provided to the comparator can be controlled by the conduction or disconnection of the switches connected to the respective threshold voltages. The specific control idea is the same as that in Figure 10 the description, and will not be elaborated here.

[0134] In addition, according to another embodiment of the present disclosure, Vref1 and / or Vref2 can also be connected to a standard capacitor, and the reference voltage is used to charge the standard capacitor. After the charging is completed, the standard capacitor is connected to the acquisition capacitor, so as to achieve the purpose of increasing or decreasing the voltage of the acquisition capacitor. According to still another embodiment of the present disclosure, a first resistor can also be provided in the branch from the first reference voltage to the acquisition capacitor, and the first current is provided to the acquisition capacitor through the first resistor. A second resistor is provided in the branch from the second reference voltage to the acquisition capacitor, and the second current is provided to the acquisition capacitor through the second resistor, so as to achieve the same purpose.

[0135] In addition, regarding Figure 10 other content of Figure 9 , reference can be made to the relevant description. It will not be elaborated here.

[0136] According to a further embodiment of the present disclosure, as Figure 13 shown, a measuring device is also provided. The measuring device can be used to measure the induced voltage of the induction capacitor C. The description of the relevant specific content can be referred to Figure 9 and Figure 10 the description, and will not be elaborated here.

[0137] An excitation voltage Va1 (constant voltage or pulsed voltage) is applied to the induction capacitor C by closing the switch S11 to charge it. After the charging is completed, the voltage of the induction capacitor C will reach the voltage value of the excitation voltage. Then, the switch S11 can be disconnected and the switch S12 can be turned on (S13 is disconnected), so that the voltage of the induction capacitor C is transferred to the acquisition capacitor C11 (the capacitance value of the acquisition capacitor C11 is greater than that of the induction capacitor C by one or more orders of magnitude). And by turning on and off the switches S11 and S12 multiple times, multiple charging of the acquisition capacitor C11 through the induction capacitor C can be achieved. In this way, the voltage of the acquisition capacitor C11 will be equal to Va1 * the capacitance value of C / the capacitance value of C11.

[0138] The voltage signal of the acquisition capacitor C11 is output through the comparator CP11, and is converted into a digital signal through the analog-to-digital conversion circuit for output. Among them, the connection method of the capacitor C11 can also adopt Figure 10 the following way.

[0139] In addition, it also includes a capacitor C12. By turning on and off the switches S13 and S12 (S11 is disconnected), the acquisition capacitor C11 is charged and discharged through the voltage Vb1, so as to achieve the adjustment function of the voltage of the acquisition capacitor C11 in the same or similar way as above. The voltage Vb1 can be opposite to the voltage Va1 or can be other values.

[0140] Figure 14 Fig. shows a battery safety management system according to an embodiment of the present disclosure. The management system may include the above measurement device, and may also include an overvoltage protection unit, an overcurrent protection unit, a power calculation unit, a model update unit, etc. Here, since each of these units needs to know the amount of change in the battery shape, the amount of change in shape will affect each unit. Each unit can perform calculations of various functions based on the output of the measurement device. The changes of these units according to the amount of change in the battery shape can be obtained according to the prior art and will not be described herein.

[0141] 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.

[0142] 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 and clearly defined.

[0143] 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 on the basis of the above disclosure, and these changes or modifications are still within the scope of the present disclosure.

Claims

1. A measuring device, characterized in that, Comprising: An excitation circuit for providing an excitation signal which is supplied to a capacitor plate portion so that the capacitor plate portion generates an induced voltage according to the induced capacitance thereof. The capacitor plate portion is disposed on the outer surface or the inner surface of the battery / battery pack or is disposed at a certain distance from the battery / battery pack. The capacitor plate portion can sense a change in capacitance when the shape of the battery / battery pack changes. A sampling capacitor which can receive the charge generated by the induced capacitance after the capacitor plate portion is excited, and the sampling capacitor can reflect the induced voltage of the induced capacitance after receiving the charge. A conversion circuit for converting the voltage of the sampling capacitor for output. The conversion circuit includes a comparator for comparing the voltage of the sampling capacitor with a threshold voltage and outputting a detection signal according to the voltage of the sampling capacitor and the threshold voltage. A processing circuit for processing according to the output of the conversion circuit to monitor the safety of the battery / battery pack and / or calculate the power of the battery / battery pack. And An application circuit which can apply different voltages to the sampling capacitor to increase or decrease the voltage value of the sampling capacitor. Wherein, after the sampling capacitor finishes receiving the charge from the induced capacitance, the voltage of the sampling capacitor can be increased or decreased by the application circuit so as to obtain the voltage value of the sampling capacitor, and the voltage value of the induced capacitance is obtained according to the voltage value of the sampling capacitor, thereby obtaining the amount of shape change of the battery / battery pack.

2. The measuring device according to claim 1, characterized in that, The excitation signal is a constant voltage signal or a pulse width signal.

3. The measuring device according to claim 1, characterized in that, Controlling the adjustment of the voltage of the sampling capacitor according to the output of the conversion circuit.

4. The measuring device according to claim 1, characterized in that, The measuring device further includes a control circuit which generates a control signal according to the output of the conversion circuit, and the application circuit increases or decreases the voltage value of the sampling capacitor according to the control signal.

5. The measuring device according to claim 4, characterized in that, The application circuit includes a first switch and a second switch which are controlled by the control signal to be turned on or off. When the first switch is turned on, a first voltage is applied to the sampling capacitor to reduce the voltage value of the sampling capacitor. When the second switch is turned on, a second voltage is applied to the sampling capacitor to increase the voltage value of the sampling capacitor.

6. The measuring device according to claim 1, characterized in that, The capacitance value of the sampling capacitor is one or more orders of magnitude larger than the capacitance value of the induced capacitance.

7. The measuring device according to claim 5, characterized in that, It further includes a standard capacitor which is connected to the first switch and the second switch. The first voltage or the second voltage is applied to the standard capacitor to charge the standard capacitor, and the increase or decrease of the voltage value of the sampling capacitor is realized through the charge transfer between the standard capacitor and the sampling capacitor.

8. The measuring device according to claim 5, characterized in that, It further includes a standard resistor, which is connected to the first switch and the second switch. When the first switch is turned on, a first current is provided to the acquisition capacitor through the first voltage and the standard resistor, so as to reduce the voltage value of the acquisition capacitor. And when the second switch is turned on, a second current is provided to the acquisition capacitor through the second voltage and the standard resistor, so as to increase the voltage value of the acquisition capacitor.

9. The measuring device according to claim 5, characterized in that, When reducing or increasing the voltage value of the acquisition capacitor, the voltage value of the acquisition capacitor is made equal to or close to the threshold voltage.

10. The measuring device according to claim 1, characterized in that, The number of the comparators is multiple, and each comparator corresponds to a different threshold voltage respectively, so as to compare the voltage of the acquisition capacitor with different threshold voltages, thereby determining the range of the threshold voltage where the voltage of the acquisition capacitor is located.

11. The measuring device according to claim 10, characterized in that, After determining the range of the threshold voltage where the voltage of the acquisition capacitor is located, the voltage of the acquisition capacitor is made equal to or close to one of the different threshold voltages by reducing or increasing the voltage of the acquisition capacitor.

12. The measuring device according to claim 6, characterized in that, The acquisition capacitor receives charges from the induction capacitor for multiple times.

13. The measuring device according to claim 12, characterized in that, The induced voltage of the induction capacitor is determined according to the voltage of the excitation signal, the output of the conversion circuit, the number of receptions, and the ratio of the acquisition capacitor to the induction capacitor, so as to determine the shape change amount of the battery / battery pack according to the determined induced voltage.

14. The measuring device according to claim 1, characterized in that, It further includes a filtering circuit, which is used to filter the output of the conversion circuit.

15. A battery safety management device, characterized in that, It includes the measuring device according to any one of claims 1 to 14.

16. A battery safety management system, characterized in that, It includes: the measuring device according to any one of claims 1 to 14; and the capacitor plate part, which is arranged on the outer surface or the inner surface of the battery / battery pack or is arranged at a certain distance from the battery / battery pack, wherein, the measuring device obtains the shape change amount of the battery / battery pack by measuring the induced voltage of the capacitor plate part.

17. The battery safety management system according to claim 16, wherein, The capacitor plate part includes a first capacitor plate part and a second capacitor plate part, and the first capacitor plate part and the second capacitor plate part are arranged at a predetermined distance apart. When the shape of the battery / battery pack changes, the mutual capacitance between the first capacitor plate part and the second capacitor plate part changes.

18. The battery safety management system according to claim 16, wherein, The measuring device obtains the shape change amount of the battery / battery pack by measuring the induced voltage of the self-capacitance of the capacitor plate part.

19. The battery safety management system according to claim 16, wherein, It further includes an overvoltage protection unit, which adjusts the overvoltage threshold according to the shape change amount of the battery / battery pack.

20. The battery safety management system according to claim 17, wherein, It further includes an overcurrent protection unit, which adjusts the overcurrent threshold according to the shape change amount of the battery / battery pack.

21. The battery safety management system according to claim 17, wherein, It further includes a power calculation unit, which calculates the power of the battery / battery pack according to the shape change amount of the battery / battery pack.

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