Battery safety detection device, battery safety management system, and device

Abstract

The present disclosure provides a battery safety detection device, comprising: an excitation circuit, which excites a detection part; a detection circuit, which detects a signal generated by the detection part according to the excitation circuit; and a switch, which controls the operation and switching of the excitation circuit and the detection circuit. The present disclosure also provides a battery safety management system and a battery safety management device.

Description

TECHNICAL FIELD

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

[0002] Rechargeable batteries, such as lithium batteries, have been widely applied to various fields, such as electric vehicles, portable tools, communication tools, etc. During use, the rechargeable batteries will deform with aging, and if the deformation is serious, it will cause the explosion of the rechargeable batteries.

[0003] Therefore, the deformation detection of the battery is particularly important, and the current battery deformation detection methods include piezoelectric detection, capacitance detection and various methods. Therefore, it is particularly important to provide a simple and effective detection method and to process the detection signal. During detection, especially in the capacitance detection method, interference will inevitably occur between the capacitance detection electrodes, which will affect the detection accuracy. Therefore, a high-precision detection method for eliminating interference is provided in the present disclosure. SUMMARY

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

[0005] According to one aspect, a battery safety detection device comprises:

[0006] A capacitance plate portion is arranged on the inner surface or the outer surface or the outer side of the battery / battery pack. When the battery / battery pack deforms, the capacitance plate portion also deforms accordingly, so that the induced capacitance of the capacitance plate portion changes, and the induced capacitance is the self-capacitance or mutual capacitance of the capacitance plate portion.

[0007] An excitation circuit is used to apply an excitation voltage to the capacitance plate portion, and the induced capacitance of the capacitance plate portion forms a corresponding induced voltage.

[0008] A detection circuit comprises a detection capacitor, and the detection capacitor can receive the induced voltage formed by the induced capacitance; and

[0009] A control switch is controlled to apply a voltage to the induced capacitance by the excitation circuit in a first detection stage to charge the induced capacitance, and to receive the induced voltage formed by the induced capacitance by the detection capacitor in a second detection stage.

[0010] According to at least one of the embodiments of the present disclosure, the control switch includes a first switch connected between the excitation voltage and the sensing capacitor and a second switch connected between the detection capacitor and the sensing capacitor.

[0011] According to at least one of the embodiments of the present disclosure, in a first detection phase, the first switch is turned on and the second switch is turned off, and in a second detection phase, the first switch is turned off and the second switch is turned on.

[0012] According to at least one of the embodiments of the present disclosure, the detection circuit further includes an operational amplifier / comparator for outputting an output value related to the voltage value of the detection capacitor.

[0013] According to at least one of the embodiments of the present disclosure, the detection capacitor is connected between a first input terminal and an output terminal of the operational amplifier / comparator; or

[0014] The detection capacitor is connected between the second switch and a ground voltage.

[0015] According to at least one of the embodiments of the present disclosure, a reset switch is connected in parallel across the detection capacitor to discharge the detection capacitor, and in the first detection phase, the reset switch is turned on, and in the second detection phase, the reset switch is turned off.

[0016] According to at least one of the embodiments of the present disclosure, the battery safety detection device further includes a shielded electrode plate portion to eliminate interference received by the electrode plate portion.

[0017] According to at least one of the embodiments of the present disclosure, the shielded electrode plate portion is connected to the excitation voltage through a first shield switch and to a reset voltage through a second shield switch, in the first detection phase, the first shield switch is turned on and the second shield switch is turned off, and in the second detection phase, the first shield switch is turned off and the second shield switch is turned on.

[0018] According to at least one of the embodiments of the present disclosure, in the case where the detection capacitor is connected between the first input terminal and the output terminal of the operational amplifier / comparator, a second input terminal of the operational amplifier / comparator is connected to a reset voltage.

[0019] According to at least one of the embodiments of the present disclosure, in the case where the detection capacitor is connected between the second switch and the ground voltage, the control switch further includes a third switch, and the third switch is connected between the first input terminal of the operational amplifier / comparator and the detection capacitor, and in a third detection phase, the third switch is turned on and the voltage value of the detection capacitor is input to the first input terminal of the operational amplifier / comparator.

[0020] According to at least one embodiment of the present disclosure, the second input terminal of the operational amplifier / comparator is connected to a threshold voltage, and the operational amplifier / comparator is used to compare the voltage value of the detection capacitor with the threshold voltage.

[0021] According to at least one embodiment of the present disclosure, the number of the operational amplifier / comparators is plural, and the second input terminal of each operational amplifier / comparator is connected to a different threshold voltage, and the voltage value of the detection capacitor is compared with the different threshold voltage, thereby determining the threshold voltage range of the operational amplifier / comparator.

[0022] According to at least one embodiment of the present disclosure, the shape of the capacitor plate part is circular, elliptical, square, rectangular, rhombic, and / or triangular, respectively.

[0023] According to another aspect, the battery safety management device integrates the excitation circuit, the detection circuit, and the control switch of the battery safety detection apparatus as described in any of the above.

[0024] According to another aspect, a battery safety management system includes:

[0025] a battery safety detection apparatus as described in any of the above; and

[0026] the capacitor plate part is disposed on the outer surface of the battery / battery pack or the inner surface of the battery / battery pack or is disposed at a distance from the battery / battery pack,

[0027] wherein the battery safety detection apparatus obtains the shape change amount of the battery / battery pack by measuring the induced voltage of the self-capacitance of the capacitor plate part.

[0028] 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, which are disposed at a predetermined distance, and when the battery / battery pack undergoes a shape change, the mutual capacitance between the first capacitor plate part and the second capacitor plate part changes.

[0029] According to at least one embodiment of the present disclosure, the battery safety detection apparatus obtains the shape change amount of the battery / battery pack by measuring the induced voltage of the self-capacitance of the capacitor plate part.

[0030] According to at least one embodiment of the present disclosure, further comprising an overvoltage protection unit that adjusts an overvoltage threshold value according to the shape change amount of the battery / battery pack.

[0031] According to at least one of the embodiments of the present disclosure, the overcurrent protection unit adjusts an overcurrent threshold according to the shape change amount of the battery / battery pack.

[0032] According to at least one of the embodiments of the present disclosure, the electric quantity calculation unit calculates an electric quantity of the battery / battery pack according to the shape change amount of the battery / battery pack.

[0033] According to at least one of the embodiments of the present disclosure, the update unit updates a parameter of a battery model according to the shape change amount of the battery / battery pack. BRIEF DESCRIPTION OF DRAWINGS

[0034] The accompanying drawings, which are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the present disclosure and together with the description serve to explain the principles of the present disclosure.

[0035] Figure 1 A schematic view of a capacitor plate portion according to an embodiment of the present disclosure is shown.

[0036] Figure 2 A schematic view of a capacitor plate portion according to an embodiment of the present disclosure is shown.

[0037] Figure 3 A schematic view of a capacitor plate portion according to an embodiment of the present disclosure is shown.

[0038] Figure 4 A schematic view of a capacitor plate portion according to an embodiment of the present disclosure is shown.

[0039] Figure 5 A schematic view of a capacitor plate portion according to an embodiment of the present disclosure is shown.

[0040] Figure 6 A schematic view of a battery safety detection device according to an embodiment of the present disclosure is shown.

[0041] Figure 7 A schematic view of a battery safety detection device according to an embodiment of the present disclosure is shown.

[0042] Figure 8 A schematic view of a battery safety detection device according to an embodiment of the present disclosure is shown.

[0043] Figure 9 A schematic view of a battery safety management device / system according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0044] The present disclosure will be described in further detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are merely exemplary and are not limiting to the present disclosure. In addition, it should also be understood that for the convenience and clarity of the description, only parts of the relevant are shown in the drawings.

[0045] It should be noted that the embodiments and features of the present disclosure can be combined with each other if there is no conflict. The technical solutions of the present disclosure will be described in detail below with reference to the drawings and in combination with the embodiments.

[0046] Unless otherwise specified, the exemplary embodiments / instances shown will be understood as providing exemplary features of various details that can implement the technical concepts of the present disclosure in practice. Therefore, unless otherwise specified, the features of various embodiments / instances can be additionally combined, separated, interchanged and / or rearranged without departing from the technical concepts of the present disclosure.

[0047] In the drawings, cross-hatching and / or shading are generally used to indicate that a portion of one component is positioned above another component. As such, unless otherwise specified, the presence of cross-hatching or shading is not a requirement of the present disclosure. In addition, for clarity and / or descriptive purposes, the sizes of the components shown in the drawings can be exaggerated relative to other components. When the exemplary embodiments can be carried out differently, a specific process sequence can be performed in a different order from that described. For example, two consecutively described processes can be performed substantially simultaneously or in an order opposite to that described. In addition, the same reference numerals represent the same components.

[0048] When a component is referred to as being "on" or "above" another component, "connected to" or "coupled to" another component, it can be directly on, directly connected to, or directly coupled to the other component, or there can be an intermediate component. However, when a component is referred to as being "directly on", "directly connected to", or "directly coupled to" another component, there is no intermediate component. For this reason, the term "connected" can refer to a physical connection, an electrical connection, etc., with or without an intermediate component.

[0049] For descriptive purposes, the disclosure can use spatially relative terms, such as "below," "lower," "under," "downward," "upward," "above," "higher," "over," and the like, to describe the relationship between one element and another element as the figure(s) are oriented. 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 figure(s). For example, if the device in the figure(s) was turned over, elements described as "below" or "under" other elements would then be oriented "above" the other elements. Thus, the example term "below" can encompass both an orientation of above and below. The device can be otherwise oriented (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0050] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Furthermore, to the extent that the terms "including," "includes," "having," "has," "a" or "an," or the like are used in the detailed description and / or claims, such terms are intended to be inclusive (i.e., to say that at least the stated feature is present), unless the context clearly indicates otherwise. Still further, it will be understood that when terms such as "has," "have," "having," or the like, are used in the detailed description and / or claims, such terms are intended to be interpreted as indicating inclusion of one or more of the stated features and are not meant to exclude or require any of the stated features.

[0051] The present disclosure provides a battery safety detection device, wherein the battery safety detection device can be used to detect at least a deformation of a battery cell, wherein the deformation can be due to a battery bulging type deformation, or a deformation of the battery cell due to an external compression. The external compression can be due to, for example, a collision, or due to acceleration, etc.

[0052] A rechargeable battery used in an electric vehicle, a power tool, a portable device, etc. generally includes a plurality of battery cells connected to provide a supply voltage.

[0053] In the following embodiments, a battery safety detection device disposed between two adjacent battery cells will be described as an example.

[0054] Figure 1A schematic diagram of a battery safety detection device according to one embodiment of the present disclosure is shown. The battery safety detection device is disposed between two batteries 111, 112, and can include a first electrode plate portion 121 and a second electrode plate portion 122, a third electrode plate portion 131 and a fourth electrode plate portion 132, and a shielding electrode plate portion 140.

[0055] The first electrode plate portion 121 and the second electrode plate portion 122, the third electrode plate portion 131 and the fourth electrode plate portion 132 are disposed on both sides of the shielding electrode plate portion 140. The first electrode plate portion 121 and the second electrode plate portion 122 can be used to detect the deformation of the first battery 111, while the third electrode plate portion 131 and the fourth electrode plate portion 132 can be used to detect the deformation of the second battery 112. The shielding electrode plate portion 140 is disposed in the middle and can be used to shield the interference between the first electrode plate portion 121 and the second electrode plate portion 122, and the third electrode plate portion 131 and the fourth electrode plate portion 132, thereby reducing the measurement error caused by the interference between the two groups of electrode plate portions, and effectively reducing the stray capacitance, etc.

[0056] The first to fourth electrode plate portions can include one or more electrodes. In Figure 1 one embodiment, each electrode plate portion includes one electrode.

[0057] The first to fourth electrode plate portions have substantially the same shape as the shielding electrode plate portion, and extend along the surface of the battery. The second electrode plate portion and the fourth electrode plate portion can further include an insulating layer between the surface of the battery and the second electrode plate portion and the fourth electrode plate portion, and can be disposed on the surface of the battery through the insulating layer.

[0058] The first electrode plate portion can be used as an electrode for an excitation signal, and the second electrode plate portion can be used as an electrode for detecting a change in electric charge; the third electrode plate portion can be used as an electrode for an excitation signal, and the fourth electrode plate portion can be used as an electrode for detecting a change in electric charge. Alternatively, the second electrode plate portion can be used as an electrode for an excitation signal, and the first electrode plate portion can be used as an electrode for detecting a change in electric charge; the fourth electrode plate portion can be used as an electrode for an excitation signal, and the third electrode plate portion can be used as an electrode for detecting a change in electric charge.

[0059] Since the second electrode plate portion and the fourth electrode plate portion are attached to the surface (which can be the inner surface or the outer surface) of the battery, when the battery deforms, the second electrode plate portion and the fourth electrode plate portion will deform accordingly, so that the induced capacitance formed between the first electrode plate portion and the second electrode plate portion will change, and the induced capacitance formed between the third electrode plate portion and the fourth electrode plate portion will also change.

[0060] In Figure 1 one embodiment, the first to fourth electrode plate portions are shown as each having one electrode. However, according to the idea of the present disclosure, the first to fourth electrode plate portions can have any suitable shape, such as a strip shape as shown in Figure 2 , a circular shape, etc. Figure 3a combination of a bar shape and a flat shape, Figure 4 a combination of a block shape and a flat shape, and so on. The shape of the electrodes (first to fourth plate portions) can be square, but it can also be rectangular, rhombic, triangular, trapezoidal, T-shaped, circular, elliptical, or the like.

[0061] In Figure 1 , it is shown that, for the first battery 111, the deformation of the first battery is detected by the change in the induced capacitance caused by the shape change between the first plate portion 121 and the second plate portion 122, and the deformation of the first battery is detected by the change in the induced capacitance caused by the shape change between the third plate portion 131 and the fourth plate portion 132. In this way, for each battery, the deformation of the battery is detected by detecting the mutual capacitance between two plate portions.

[0062] In Figure 2 , it is shown that the first shield plate portion 241 is provided on the surface of the first battery 211, and the second shield plate portion 242 is provided on the surface of the second battery 212. In this way, the interference caused by the conductive material on the surface of the first battery 211 is shielded by the first shield plate portion 241, and the interference caused by the conductive material on the surface of the second battery 212 is shielded by the second shield plate portion 242. For example, the surface of the battery can be wrapped with a metal material such as an aluminum foil, and the conductive material such as the aluminum foil will interfere with the measurement of the induced capacitance.

[0063] In Figure 1 , the deformation of the two batteries is measured by two plate portions respectively, and in Figure 2 , the deformation of the two batteries (i.e., the relative shape change of the two batteries) is measured by the two plate portions 220 and 230.

[0064] Although in the embodiments shown in the figures, the deformation is detected by mutual capacitance, it can also be detected by self-capacitance, for example, the transmission of charges can be realized by the change in the self-capacitance of a single electrode, one end of which can be connected to an excitation or sampling circuit, and the other end can be connected to ground. In this way, the deformation can be detected by the change in the self-capacitance of the electrode caused by the shape change of the battery. In addition, the measurement can also be realized by a combination of self-capacitance and mutual capacitance.

[0065] In addition, as shown in Figure 5 , a shield plate portion can also be provided between each electrode of the two plate portions, so as to prevent mutual interference between each adjacent electrode, so that the deformation can be measured more accurately.

[0066] In Figure 1 to Figure 5In the present embodiment, the shielded electrode plate portion is shown as a continuous shape, but according to the present disclosure, it can be provided as a separate shape, that is, each electrode uses a corresponding shielded electrode plate portion.

[0067] Figure 6 A schematic diagram of a detection circuit according to one embodiment of the present disclosure is shown. In the present embodiment, a shielded electrode plate portion is provided. Figure 6

[0068] When the excitation is applied, the deformation is detected based on the voltage generated by the self-capacitance of the electrode plate (one electrode plate is excited, and then the voltage generated by the self-capacitance of the electrode plate is detected) or the mutual capacitance (for example, the mutual capacitance between the first electrode plate portion and the second electrode plate portion, one electrode plate portion is excited, and the other electrode plate portion is used as a detection electrode, and the deformation is detected based on the voltage generated by the mutual capacitance between the two electrode plate portions).

[0069] In the present disclosure, the voltage of the sensing capacitor C can also be detected without using a shielded electrode plate portion. In the case where a shielded electrode plate portion is provided, the detection accuracy can be effectively improved.

[0070] First, the case where a shielded electrode plate portion is not used is described. As shown in FIG. 6, the detection circuit can include a first switch S61, a second switch S62, a detection capacitor Cl, and an operational amplifier / comparator CP61. Figure 6

[0071] In the first detection stage, the first switch S61 is closed, and the second switch S62 is opened, so that the excitation voltage VI (high voltage) is applied to the sensing capacitor C (mutual capacitance or self-capacitance). After the excitation voltage VI is applied, the second detection stage is implemented, the first switch S61 is opened, and the second switch S62 is closed, so that the voltage of the sensing capacitor C is transferred to the detection capacitor Cl. After the transfer is completed, the operational amplifier / comparator CP61 can compare the voltage of the detection capacitor Cl with the reset voltage V2, so that the detection of the voltage of the sensing capacitor C is completed, and the capacitance value of the sensing capacitor C can be obtained based on the detection. Furthermore, if the battery is deformed, the electrode plates are also deformed, and the distance between the electrode plates is inversely proportional to the sensing capacitance value, that is, the smaller the distance, the larger the sensing capacitance value. Thus, the distance between the electrode plates can be obtained from the output of the operational amplifier / comparator CP61, and the deformation amount of the battery can be obtained.

[0072] In addition, a discharge switch S63 can be connected across the detection capacitor, which is closed in the first detection stage to discharge the detection capacitor Cl, and is opened in the second detection stage.

[0073] In the case where a shielded electrode plate portion is provided, the shielded electrode plate portion can be provided on the first electrode plate portion and the second electrode plate portion. Figure 6 ​​As shown in FIG. 6, a detection capacitor Cl is connected between the first input terminal and the output terminal of the operational amplifier / comparator CP61, and a reset voltage V2 is connected to the second input terminal of the operational amplifier / comparator CP61. However, the detection capacitor Cl can also be connected as shown in FIG. 8, for example. In this case, the detection capacitor C81 is connected to the inductive capacitor C through the switch S82, and connected to the first input terminal of the operational amplifier / comparator CP81 through the switch S83, and the second input terminal of the operational amplifier / comparator CP81 is connected to the reset voltage V2. Figure 8

[0074] For the connection mode shown in FIG. 6, the switch S81 can be closed and the switches S82 and S83 can be opened in the first detection stage, the switch S81 can be opened and the switch S82 can be closed in the second detection stage, and the switches S81 and S82 can be opened and the switch S83 can be closed in the third detection stage. Figure 8

[0075] In the case of including the shield plate portion, according to the embodiment shown in FIG. 6, the following connection mode and control mode can be adopted. Figure 6

[0076] In the first detection stage, the first switch S61 and the fifth switch S65 are closed and the second switch S62 is opened (the fourth switch S64 can also be closed), so that the inductive capacitor C and the shield plate portion J61 are charged by the excitation voltage Vl. By charging the inductive capacitor C and the shield plate portion J61 at the same time, the inductive capacitor C can effectively avoid the interference from other conductors, so as to avoid affecting the capacitance value of the inductive capacitor C.

[0077] When the charging is completed, the second detection stage is performed. In the second detection stage, the first switch S61 is opened and the second switch S62 is closed (the third switch S63 is opened), so that the voltage of the inductive capacitor C is transferred to the detection capacitor Cl. After the transfer is completed, the operational amplifier / comparator CP61 compares the reset voltage V2 and the voltage value of the detection capacitor Cl. In addition, the reset voltage V2 can be a ground voltage, in which case the output of the operational amplifier / comparator CP61 directly reflects the voltage value of the detection capacitor Cl. It should be particularly noted that in the second detection stage, the fifth switch S65 is also opened and the fourth switch S64 is closed, so that the shield plate portion J61 is discharged, which effectively compares the interference from other conductors during the voltage transfer from the inductive capacitor C to the detection capacitor C2. The fourth switch S64 can be connected to the reset voltage V2, which can be a ground voltage.

[0078] In the case of including the shield plate portion, according to the embodiment shown in FIG. 6, the following connection mode and control mode can be adopted. Figure 7 ​​​The diagram illustrates the control configuration of two shielded electrode sections. The first shielded electrode section J71 is connected to the reset voltage V2 via switch S75, and the second shielded electrode section J72 is connected to the reset voltage V2 via switch S74. The first shielded electrode section J71 is connected to the excitation voltage V1 via switch S76, and the second shielded electrode section J72 is connected to the excitation voltage V1 via switch S77.

[0079] The sensing capacitor C is connected to the excitation voltage V1 through switch S71, and the sensing capacitor C is connected to the first input terminal of the operational amplifier / comparator CP71 through switch S72. The second input terminal of the operational amplifier / comparator CP71 is connected to the reset voltage V2, and the detection capacitor C71 is connected between the first input terminal and the output terminal of the operational amplifier / comparator CP71. Switch S73 can be connected in parallel across the two ends of the detection capacitor C71.

[0080] In the first detection phase, switches S71, S76, and S77 are closed, while switches S72, S75, and S74 are opened (switch S73 can also be closed simultaneously). This charges the first and second shielding plates and simultaneously charges the sensing capacitor C. After charging is complete, the voltage of the sensing capacitor C will equal the voltage V1. After charging is complete, the second detection phase begins. In the second detection phase, switches S71, S76, and S77 are opened, while switches S72, S75, and S74 are closed (switch S73 can also be opened simultaneously). In the second detection phase, the voltage of the sensing capacitor C will transfer to the detection capacitor C71. The voltage of capacitor C71 is then detected by the output of the operational amplifier / comparator CP71.

[0081] exist Figure 7 In the embodiments, the reset voltage V2 can be the ground voltage. In addition, the reset voltage connected to CP71 can also be different from the reset voltage connected to the shield plate. For example, the reset voltage connected to CP71 can be a threshold voltage of other voltage values.

[0082] according to Figure 7 The achieved technical effects and Figure 6 The implementation methods are the same and will not be described again.

[0083] exist Figure 8 The diagram illustrates the control configuration of two shielded electrode sections. The first shielded electrode section J81 is connected to the reset voltage V2 via switch S86, and the second shielded electrode section J82 is connected to the reset voltage V2 via switch S85. The first shielded electrode section J81 is connected to the excitation voltage V1 via switch S87, and the second shielded electrode section J82 is connected to the excitation voltage V1 via switch S88.

[0084] The sensing capacitor C is connected to the excitation voltage V1 via switch S81, and is also connected to the first input terminal of operational amplifier / comparator CP81 via switches S82 and S83. The second input terminal of operational amplifier / comparator CP81 is connected to the reset voltage V2. One end of the sensing capacitor C81 can be connected to the junction of switches S82 and S83, and the other end can be connected to the reset voltage V2. Switch S84 can be connected in parallel across the two ends of the sensing capacitor C81.

[0085] In the first detection stage, switches S81, S87, and S88 are closed, while switches S86, S85, and S82 are opened (switch S84 can also be closed simultaneously, or switch S83 can be opened). This charges the first and second shielding plates and simultaneously charges the sensing capacitor C. After charging is complete, the voltage of the sensing capacitor C will equal the voltage V1. After charging, the second detection stage begins. In the second detection stage, switches S81, S87, and S88 are opened, while switches S86, S85, and S82 are closed (switch S84 can also be opened simultaneously, or switch S83 can be opened). In the second detection stage, the voltage of the sensing capacitor C will transfer to the detection capacitor C81. In the third detection stage, switch S83 can be closed while the other switches are open. The operational amplifier / comparator CP81 compares the voltage of the detection capacitor C81 with the threshold voltage V3 to generate the output. Figure 8 In the implementation embodiments, multiple operational amplifiers / comparators may be included, and multiple threshold voltages may be corresponding to them. The voltage value of the detection capacitor C81 is obtained by sequentially comparing the voltage of the detection capacitor C81 with different threshold voltages.

[0086] exist Figure 8 In one embodiment, the reset voltage V2 can be the ground voltage. According to... Figure 8 The achieved technical effects and Figure 6 The implementation methods are the same and will not be described again.

[0087] Additionally, this disclosure may include a feedback circuit that can receive the output signal of the operational amplifier / comparator and adjust the voltage of the detection capacitor based on the output signal.

[0088] For example, in the case of comparing the voltage of the detection capacitor with the threshold threshold voltage, if less than the threshold voltage, the operational amplifier / comparator outputs a low voltage signal, at this time the voltage of the detection capacitor can be increased through the feedback circuit until the output of the operational amplifier / comparator flips to a high voltage signal. The process of increasing the voltage of the detection capacitor can be implemented by multiple times, each time increasing a preset voltage, so that the voltage value of the detection capacitor can be accurately obtained according to the flip time, the number of times of applying the preset voltage and the preset voltage value. For example, in the case of the detection capacitor voltage being 8V, the threshold voltage being 10V, and the detection capacitor voltage being 10V by applying a preset voltage of 1V to the detection capacitor twice, so that the output of the operational amplifier / comparator will flip to a high voltage signal 1. According to the number of times and the preset voltage 1V, the voltage of the detection capacitor can be accurately obtained as 8V. Based on the same principle, if greater than or equal to the threshold voltage, the operational amplifier / comparator outputs a high voltage signal, and the accurate detection capacitor voltage can be obtained by reducing the detection capacitor voltage.

[0089] Figure 9 A battery safety management system / device is shown according to the present disclosure, wherein the battery safety management system / device can include a detection circuit (as described above), and can further include an analog-to-digital conversion circuit for converting the output of the detection circuit into a digital signal, and can further include a filter (low-pass or nonlinear filter), the output of the filter can be connected to a processor, wherein the processor can include an overvoltage protection unit, an overcurrent protection unit, a battery capacity calculation unit, and an update unit.

[0090] The overvoltage protection unit can calculate the overvoltage threshold of the battery according to the deformation amount of the battery. The overcurrent protection unit can calculate the overcurrent threshold of the battery according to the deformation amount of the battery. The battery capacity calculation unit can calculate the battery capacity according to the deformation amount of the battery. The update unit can calculate the relevant update parameters of the battery model according to the deformation amount of the battery, and update.

[0091] In the description of the present specification, the description of the terms "one embodiment / way", "some embodiments / ways", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment / way or example are included in at least one embodiment / way or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment / way or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments / ways or examples. In addition, the person skilled in the art can combine and combine the different embodiments / ways or examples described in the present specification and the features of the different embodiments / ways or examples without contradiction.

[0092] In addition, the terms "first", "second", etc. are used only for the purpose of description, and should not be understood as indicating or implying relative importance or a specific number of the technical features indicated. Thus, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly and specifically limited.

[0093] Those skilled in the art will understand that the above-mentioned embodiments are only for the purpose of clearly illustrating the present disclosure, and are not intended to limit the scope of the present disclosure. 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 battery safety testing device, characterized in that, include: The capacitor plate portion is disposed on the inner surface, outer surface, or outer side of the battery / battery pack. When the shape of the battery / battery pack changes, the shape of the capacitor plate portion also changes accordingly, thereby causing the induced capacitance of the capacitor plate portion to change. The induced capacitance is the self-capacitance or mutual capacitance of the capacitor plate portion. An excitation circuit is provided to apply an excitation voltage to the capacitor plate portion, and the induced capacitance of the capacitor plate portion generates a corresponding induced voltage. A detection circuit, the detection circuit including a detection capacitor, and the detection capacitor being able to receive the induced voltage generated by the sensing capacitor; as well as A control switch is configured to apply a voltage to the sensing capacitor via an excitation circuit during a first detection phase, so as to charge only the sensing capacitor, and to receive the induced voltage formed by the sensing capacitor via the detection capacitor during a second detection phase. The control switch includes a first switch and a second switch. The first switch is connected between the excitation voltage and the sensing capacitor, and the second switch is connected between the detection capacitor and the sensing capacitor. In the first detection phase, the first switch is turned on while the second switch is turned off, and the detection capacitor and the sensing capacitor are disconnected. In the second detection phase, the first switch is turned off while the second switch is turned on, and the detection capacitor and the sensing capacitor are connected. The battery safety detection device also includes a shielded electrode section to eliminate interference to the capacitor electrode section; The shielded electrode portion is connected to the excitation voltage via a first shielding switch and to the reset voltage via a second shielding switch. In the first detection phase, the first shielding switch is turned on and the second shielding switch is turned off. In the second detection phase, the first shielding switch is turned off and the second shielding switch is turned on. In the first detection stage, the inductive capacitor and the shielding plate are charged by the excitation voltage. By charging the inductive capacitor and the shielding plate simultaneously, the inductive capacitor is effectively protected from interference from other conductors, thus avoiding any impact on the capacitance value of the inductive capacitor. The detection circuit further includes an operational amplifier, the detection capacitor is connected between the first input terminal and the output terminal of the operational amplifier, the second switch is connected between the sensing capacitor and the first input terminal of the operational amplifier, and the second input terminal of the operational amplifier is connected to a reset voltage. The shapes of the capacitor plate section and the shield plate section are basically the same.

2. A battery safety testing device, characterized in that, include: The capacitor plate portion is disposed on the inner surface, outer surface, or outer side of the battery / battery pack. When the shape of the battery / battery pack changes, the shape of the capacitor plate portion also changes accordingly, thereby causing the induced capacitance of the capacitor plate portion to change. The induced capacitance is the self-capacitance or mutual capacitance of the capacitor plate portion. An excitation circuit is provided to apply an excitation voltage to the capacitor plate portion, and the induced capacitance of the capacitor plate portion generates a corresponding induced voltage. A detection circuit, the detection circuit including a detection capacitor, and the detection capacitor being able to receive the induced voltage generated by the sensing capacitor; as well as A control switch is configured to apply a voltage to the sensing capacitor via an excitation circuit during a first detection phase, so as to charge only the sensing capacitor, and to receive the induced voltage formed by the sensing capacitor via the detection capacitor during a second detection phase. The control switch includes a first switch and a second switch. The first switch is connected between the excitation voltage and the sensing capacitor, and the second switch is connected between the detection capacitor and the sensing capacitor. In the first detection phase, the first switch is turned on while the second switch is turned off, and the detection capacitor and the sensing capacitor are disconnected. In the second detection phase, the first switch is turned off while the second switch is turned on, and the detection capacitor and the sensing capacitor are connected. The battery safety detection device also includes a shielded electrode section to eliminate interference to the capacitor electrode section; The shielded electrode portion is connected to the excitation voltage via a first shielding switch and to the reset voltage via a second shielding switch. In the first detection phase, the first shielding switch is turned on and the second shielding switch is turned off. In the second detection phase, the first shielding switch is turned off and the second shielding switch is turned on. In the first detection stage, the inductive capacitor and the shielding plate are charged by the excitation voltage. By charging the inductive capacitor and the shielding plate simultaneously, the inductive capacitor is effectively protected from interference from other conductors, thus avoiding any impact on the capacitance value of the inductive capacitor. The detection circuit further includes a comparator, the detection capacitor is connected between the second switch and the ground voltage, and the reset voltage is the ground voltage; The control switch further includes a third switch, which is connected between the first input terminal of the comparator and the detection capacitor. During the third detection phase, the third switch is turned on and inputs the voltage value of the detection capacitor to the first input terminal of the comparator. The second input terminal of the comparator is connected to a threshold voltage. The battery safety detection device also includes a feedback circuit that receives the output signal of the comparator and adjusts the voltage of the detection capacitor according to the output signal.

3. The apparatus as described in claim 1 or 2, characterized in that, A reset switch is connected in parallel across the two ends of the detection capacitor to discharge the detection capacitor. In the first detection stage, the reset switch is turned on, and in the second detection stage, the reset switch is turned off.

4. The apparatus as claimed in claim 2, characterized in that, The comparators are multiple, and the second input terminal of each comparator is connected to a different threshold voltage. The voltage value of the detection capacitor is compared with the different threshold voltages to determine the voltage value of the detection capacitor.

5. The apparatus as described in claim 1 or 2, characterized in that, The shapes of the capacitor plates are respectively circular, elliptical, square, rectangular, rhomboid and / or triangular.

6. A battery safety management system, characterized in that, include: The apparatus as described in any one of claims 1 to 5; as well as The capacitor plate portion is disposed on the outer surface of the battery / battery pack, or on the inner surface of the battery / battery pack, or disposed at a certain distance from the battery / battery pack. The battery safety detection device obtains the shape change of the battery / battery pack by measuring the induced voltage on the capacitor plate.

7. The battery safety management system as described in claim 6, characterized in that, The capacitor plate portion includes a first capacitor plate portion and a second capacitor plate portion, which are spaced apart by a predetermined distance. When the shape of the battery / battery pack changes, the mutual capacitance between the first capacitor plate portion and the second capacitor plate portion changes.

8. The battery safety management system as described in claim 6, characterized in that, The battery safety detection device obtains the shape change of the battery / battery pack by measuring the induced voltage of the self-capacitance of the capacitor plate.

9. The battery safety management system as described in claim 6, characterized in that, It also includes an overvoltage protection unit that adjusts the overvoltage threshold based on the amount of shape change of the battery / battery pack.

10. The battery safety management system as described in claim 6, characterized in that, It also includes an overcurrent protection unit that adjusts the overcurrent threshold based on the shape change of the battery / battery pack.

11. The battery safety management system as described in claim 6, characterized in that, It also includes a power calculation unit, which calculates the power of the battery / battery pack based on the amount of shape change of the battery / battery pack.

12. The battery safety management system as described in claim 6, characterized in that, It also includes an update unit that updates the parameters of the battery model based on the amount of shape change of the battery / battery pack.

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