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

Abstract

The present disclosure provides a battery detection device, including: a sensing component, a collection unit, the collection unit is electrically connected to the sensing component, and a processing unit, the processing unit processes the changed electrical signal collected by the collection unit. The present disclosure also provides a battery detection method and a battery management system and device.

Description

Technical Field

[0001] The present disclosure relates to a battery detection device, a detection method, and a battery management system and device. Background Art

[0002] Rechargeable batteries are currently widely used, but during the charging and discharging process, the battery will age, and battery aging may cause safety issues. For example, during the charging and discharging process, the battery may deform, and when the deformation reaches a certain degree, the battery may explode.

[0003] For safety reasons, it is necessary to detect the deformation of the battery. The deformation detection method in the prior art may not be accurate enough and the cost is too high.

[0004] Therefore, in order to prevent safety accidents, it is necessary to detect battery deformation effectively and accurately. Summary of the invention

[0005] In order to solve one of the above technical problems, the present disclosure provides a battery detection device, a detection method, and a battery management system and device.

[0006] According to one aspect of the present disclosure, there is provided a battery detection device, comprising:

[0007] A sensing component, wherein the sensing component is disposed on an outer surface or an inner surface of a battery, or an outer surface or an inner surface of a battery pack, so that when the shape of the battery or the battery pack changes, the shape of the sensing component changes accordingly, thereby enabling the sensing component to reflect the shape change of the battery or the battery pack;

[0008] a collecting unit, the collecting unit being electrically connected to the sensing component, so that when the shape of the sensing component changes, the collecting unit collects the changed electrical signal caused by the change in the shape of the sensing component; and

[0009] A processing unit, wherein the processing unit determines the shape change of the battery or battery pack according to the changed electrical signal collected by the collecting unit.

[0010] According to at least one embodiment of the present disclosure, the induction component includes one or more induction components disposed along an outer surface or an inner surface of the battery, or an outer surface or an inner surface of a battery pack.

[0011] According to at least one embodiment of the present disclosure, when the shape of the sensing component changes, the resistance value of the sensing component changes accordingly, and the changed electrical signal is obtained through the changed resistance value.

[0012] According to at least one embodiment of the present disclosure, when the shape change value of the battery or battery pack is greater than or equal to the change threshold, the sensing component can be separated, and when the shape change value of the battery or battery pack is less than the change threshold, the sensing component is in a connected state.

[0013] The battery detection device determines the shape change of the battery or battery pack by the separation state and the connection state of the sensing component.

[0014] According to at least one embodiment of the present disclosure, each induction component is formed in one piece and forms a continuous state, or,

[0015] Each sensing component includes two parts, and the ends of the two sensing components are in contact with each other or overlap with each other to form a contact state.

[0016] According to at least one embodiment of the present disclosure, when the sensing component is separated into two parts, the shape change of the battery or battery pack in the first direction is detected by collecting the sensing capacitance between the two parts of the sensing component.

[0017] According to at least one embodiment of the present disclosure, in the case where the induction component is a plurality of induction components, when at least one of the induction components is separated, a shape change in a first direction of the battery or the battery pack is detected by measuring the induction capacitance between the two disconnected parts of the induction component, and a shape change in a second direction of the battery or the battery pack is detected by measuring the induction capacitance between the induction component and an adjacent induction component, wherein the first direction is substantially perpendicular to the second direction.

[0018] According to at least one embodiment of the present disclosure, the sensing component is provided with a breakable position, so that when the shape change value of the battery or battery pack is greater than or equal to a change threshold, the sensing component will be separated into two parts at the breakable position.

[0019] According to at least one embodiment of the present disclosure, the sensing component is disposed on a film, and the film is attached to an outer surface or an inner surface of the battery, or an outer surface or an inner surface of a battery pack.

[0020] According to at least one embodiment of the present disclosure, when there are a plurality of inductive components, shielding components are provided between the inductive components to prevent a capacitive effect from being formed between adjacent inductive components.

[0021] According to at least one embodiment of the present disclosure, when there are multiple induction components, when one or more induction components are separated, adjacent induction components of the one or more induction components are grounded, and the shape change of the battery or battery pack is detected by detecting the capacitance generated between two parts of the one or more induction components.

[0022] According to at least one embodiment of the present disclosure, the battery detection device further includes a driving unit, which provides a driving signal to the sensing component so that the collecting unit collects an electrical signal generated by the sensing component based on the driving signal.

[0023] According to at least one embodiment of the present disclosure, the battery detection device further includes:

[0024] an analog-to-digital conversion unit, the analog-to-digital conversion unit receiving the electrical signal from the acquisition unit and converting the electrical signal into a digital signal; and

[0025] A filtering unit is used to filter the digital signal, wherein the filtering unit includes a low-pass filter and / or a nonlinear filter, and the filtered signal is transmitted to the processing unit.

[0026] According to at least one embodiment of the present disclosure, the battery detection device further includes:

[0027] a threshold updating unit, the threshold updating unit receiving the shape change of the battery or battery pack obtained by the processing unit, and updating a threshold used in a battery detection process based on the shape change; and / or

[0028] A parameter adjustment unit, wherein the parameter adjustment unit receives the shape change of the battery or battery pack obtained by the processing unit, and adjusts the parameters used in the battery detection process based on the shape change, thereby adjusting at least one of the charging current parameter, the discharging current parameter, the temperature parameter, the power calculation parameter, and the battery model parameter.

[0029] According to at least one embodiment of the present disclosure, the battery detection device further includes:

[0030] a power calculation unit, the power calculation unit being capable of calculating the power of the battery according to the parameters adjusted by the parameter adjustment unit; and / or

[0031] A protection unit is configured to adjust a charging current and / or a discharging current based on the shape change amount.

[0032] According to another aspect of the present disclosure, a detection method as described in any one of the above items comprises:

[0033] collecting the electrical signal of the sensing component; and

[0034] The change in shape of the battery or battery pack is detected based on the change in the electrical signal of the sensing component.

[0035] According to at least one embodiment of the present disclosure, the change in the electrical signal is caused by a change in the resistance value of the sensing component, and when the shape of the battery or the battery pack changes, the resistance value of the sensing component changes accordingly.

[0036] According to at least one embodiment of the present disclosure, it further includes determining whether the sensing component is separated. If the sensing component is separated, switching to a capacitance detection mode, in which the shape change of the battery or battery pack is further detected by detecting the sensing capacitance between the sensing components separated into two parts, or

[0037] Regardless of whether the inductive component is disconnected, the cycle switches to the capacitance detection mode.

[0038] According to at least one embodiment of the present disclosure, in the capacitance detection mode, a shape change of a battery or a battery pack in a first direction is detected by detecting the inductive capacitance between inductive devices separated into two parts, and a shape change of the battery or the battery pack in a second direction is detected by detecting the inductive capacitance between adjacent inductive devices, and the first direction and the second direction are substantially perpendicular.

[0039] According to at least one embodiment of the present disclosure, the method further includes performing analog-to-digital conversion on the collected electrical signal of the sensing component, and filtering the digital signal after the analog-to-digital conversion, so as to obtain the shape change of the battery or battery pack based on the filtered signal.

[0040] According to at least one embodiment of the present disclosure, a threshold used in a battery detection process is updated according to the shape change amount, and / or a parameter used in a battery detection process is adjusted according to the shape change amount.

[0041] According to another aspect of the present disclosure, a battery management system includes: a battery detection device as described in any one of the above items, wherein the battery detection device is used to detect shape changes of the battery or battery pack.

[0042] According to another aspect of the present disclosure, a battery management device is provided, wherein the battery management device integrates other units except the sensing component in the device as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The accompanying drawings illustrate exemplary embodiments of the present disclosure and together with the description serve to explain the principles of the present disclosure. These drawings are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this specification.

[0044] Figure 1 A schematic diagram of a battery detection device according to an embodiment of the present disclosure is shown.

[0045] Figure 2 A schematic diagram of a battery detection device according to an embodiment of the present disclosure is shown.

[0046] Figure 3 A schematic diagram of a battery detection device according to an embodiment of the present disclosure is shown.

[0047] Figure 4 A schematic diagram of a battery detection device according to an embodiment of the present disclosure is shown.

[0048] Figure 5 A schematic diagram of an induction component according to one embodiment of the present disclosure is shown.

[0049] Figure 6 A schematic diagram of an induction component according to one embodiment of the present disclosure is shown.

[0050] Figure 7 A schematic diagram of an induction component according to one embodiment of the present disclosure is shown.

[0051] Figure 8 A schematic diagram of an induction component according to one embodiment of the present disclosure is shown.

[0052] Fig. 9 A schematic diagram of a battery detection device according to an embodiment of the present disclosure is shown.

[0053] Fig.10 A flow chart of a battery detection method according to an embodiment of the present disclosure is shown.

[0054] Fig.11 A flow chart of a battery detection method according to an embodiment of the present disclosure is shown.

[0055] Fig.12 A schematic diagram of an analog-to-digital conversion device according to an embodiment of the present disclosure is shown.

[0056] Fig.13 A circuit diagram of a first-stage integration unit according to one embodiment of the present disclosure is shown.

[0057] Fig.14 A circuit diagram of a second-stage integration unit according to one embodiment of the present disclosure is shown.

[0058] Fig.15 A circuit diagram of an operational amplifier according to one embodiment of the present disclosure is shown.

[0059] Fig.16 A circuit diagram of a quantization unit according to one embodiment of the present disclosure is shown.

[0060] Fig.17 A circuit diagram of a clock generation unit according to an embodiment of the present disclosure is shown.

[0061] Fig.18 A circuit diagram of a chopper circuit according to one embodiment of the present disclosure is shown.

[0062] Fig.19 A circuit diagram of a low-pass filtering unit according to one embodiment of the present disclosure is shown.

[0063] Fig. 20 A schematic diagram of a battery management system according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0064] The present disclosure is further described in detail below in conjunction with the accompanying drawings and implementations. It is understood that the specific implementations described herein are only used to explain the relevant content, rather than to limit the present disclosure. It should also be noted that, for ease of description, only the parts related to the present disclosure are shown in the accompanying drawings.

[0065] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in the present disclosure can be combined with each other. The technical solution of the present disclosure will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0066] Unless otherwise specified, the exemplary embodiments / embodiments shown will be understood as providing exemplary features of various details of some ways in which the technical concept of the present disclosure can be implemented in practice. Therefore, unless otherwise specified, the features of the various embodiments / embodiments can be combined, separated, interchanged and / or rearranged without departing from the technical concept of the present disclosure.

[0067] The use of cross-hatching and / or shading in the accompanying drawings is generally used to make the boundaries between adjacent components clear. As such, unless otherwise specified, the presence or absence of cross-hatching or shading does not convey or indicate any preference or requirement for the specific materials, material properties, dimensions, proportions, commonalities between the components shown, and / or any other characteristics, attributes, properties, etc. of the components. In addition, in the accompanying drawings, the sizes and relative sizes of the components may be exaggerated for clarity and / or descriptive purposes. When the exemplary embodiments may be implemented differently, the specific process sequence may be performed in a different order than described. For example, two successively described processes may be performed substantially simultaneously or in an order opposite to the described order. In addition, the same figure numbers represent the same components.

[0068] When a component is referred to as being "on" or "over," "connected to," or "coupled to" another component, the component may be directly on, directly connected to, or directly coupled to the other component, or intervening components may be present. However, when a component is referred to as being "directly on," "directly connected to," or "directly coupled to" another component, there are no intervening components. For this purpose, the term "connected" may refer to a physical connection, an electrical connection, etc., with or without intervening components.

[0069] For descriptive purposes, the present disclosure may use spatially relative terms such as "under," "beneath," "under," "down," "over," "upper," "above," "higher," and "side (e.g., as in "sidewall")," to describe the relationship of one component to another (other) component as shown in the accompanying drawings. The spatially relative terms are intended to encompass different orientations of the device in use, operation, and / or manufacture in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, components described as "under" or "beneath" other components or features would subsequently be positioned "over" the other components or features. Thus, the exemplary term "under" can encompass both the "above" and "below" orientations. Furthermore, the device may be otherwise oriented (e.g., rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein should be interpreted accordingly.

[0070] The terms used here are for the purpose of describing specific embodiments, and are not intended to be restrictive. As used here, unless the context clearly indicates otherwise, the singular forms "one (kind, person)" and "said (the)" are also intended to include plural forms. In addition, when the terms "comprise" and / or "include" and their variations are used in this specification, it is explained that there are stated features, integral bodies, steps, operations, parts, assemblies and / or their groups, but it is not excluded that there are or add one or more other features, integral bodies, steps, operations, parts, assemblies and / or their groups. It should also be noted that, as used here, the terms "substantially", "approximately" and other similar terms are used as approximate terms and not as degree terms, so that they are used to explain the inherent deviations of the measured values, calculated values ​​and / or the values ​​provided that will be recognized by those of ordinary skill in the art.

[0071] According to an embodiment of the present disclosure, a battery detection device is provided. The battery of the present disclosure may be a rechargeable battery, such as a lithium-ion battery.

[0072] Figures 1 to 4 FIG. 1 shows several forms of battery detection devices according to embodiments of the present disclosure. It should be noted that the concept of the present disclosure is not limited to the forms shown in the figure. Other suitable forms can also be used in the present disclosure. For example, the sensing component 100 is a curved shape or other suitable shapes. Figure 1 The inductive component 100 is shown in the form of a belt or strip. Figure 2 1 shows that the induction component 100 is in the shape of a belt or strip as a whole, and is also provided with a notch as a breakable position 100. Figure 3 FIG. 1 shows that the sensing component 100 is in a curved strip position. Figure 4 It is shown that the sensing component 100 can be in other shapes. In the present disclosure, the sensing component 100 can be arranged along one direction of the battery, or it can be arranged along two directions of the battery, for example, the two directions can be at any angle, such as 90 degrees, etc. For example, a mesh-shaped sensing component 100 can also be arranged.

[0073] like Figures 1 to 4 As shown, the battery detection device 10 may include a sensing component 100, a collection unit, a processing unit, and the like.

[0074] The sensing component 100 is arranged on the outer surface or inner surface of the battery, or the outer surface or inner surface of the battery pack, so that when the shape of the battery or the battery pack 20 changes, the shape of the sensing component 100 changes accordingly, so that the sensing component 100 can reflect the shape change of the battery or the battery pack.

[0075] The outer packaging of the battery or battery pack may be a flexible packaging, and can be deformed along with the deformation of the battery itself.

[0076] The collecting unit is electrically connected to the sensing component 100 , so that when the shape of the sensing component 100 changes, the collecting unit collects the changed electrical signal caused by the shape change of the sensing component 100 .

[0077] The processing unit determines the shape change of the battery or the battery pack according to the changed electrical signal collected by the collecting unit.

[0078] In a preferred embodiment of the present disclosure, the induction component 100 includes one or more induction components 100 disposed along the outer surface or inner surface of the battery, or the outer surface or inner surface of the battery pack. Figures 1 to 4 The case where only one is set is shown in Figures 5 and 6 The case where multiple ones are provided is shown (in the present disclosure, multiple means more than two).

[0079] Figure 5 and Figure 6 Two shapes of sensing components are shown, and multiple sensing components of other shapes can also be provided. Figures 5 and 6 As shown, the plurality of sensing components may extend in parallel along the first direction. In addition, in the present disclosure, the extension directions of the plurality of sensing components may also be different and may also intersect.

[0080] According to the embodiments of the present disclosure, when the shape of the sensing component 100 changes, the resistance value of the sensing component 100 changes accordingly, and a change electrical signal is obtained through the changed resistance value. When the shape change value of the battery or battery pack is greater than or equal to the change threshold, the sensing component 100 can be separated, and when the shape change value of the battery or battery pack is less than the change threshold, the sensing component 100 is in a connected state, and the battery detection device determines the shape change of the battery or battery pack through the separated state and the connected state of the sensing component 100.

[0081] Each inductive component 100 is integrally formed and forms a connected state, or each inductive component 100 includes two parts, and the ends of the two parts of the inductive component 100 are in contact with each other or overlapped with each other to form a contact state.

[0082] That is to say, in the present disclosure, the sensing component can be in two states as the battery or battery pack is deformed, the first state is a connected state, and the second state is a separated state. In the connected state, a resistance measurement mode can be used, and in the separated state, a capacitance measurement module can be used. This can avoid the situation where, when the resistance measurement mode is used, when the sensing component is in the separated state, since for a certain sensing component, it has been disconnected, it will no longer be able to measure through the resistance measurement mode, so that it will not continuously monitor the battery deformation.

[0083] According to the concept of the present disclosure, the deformation of the battery can be continuously monitored, so that the safety of the battery can be maintained to a greater extent.

[0084] In the case of resistance measurement mode, when deformation occurs, the resistance value of the sensing component will change accordingly. A fixed voltage can be applied to the sensing component to cause a current change through the change in resistance. The deformation of the battery can be reflected by detecting the change in current.

[0085] In the capacitance measurement mode, when the sensing component 100 is separated into two parts, the shape change of the battery or battery pack in the first direction is detected by collecting the sensing capacitance between the two parts of the sensing component 100. In the case where the sensing component 100 is a plurality of sensing components 100, when at least one sensing component 100 is separated, the shape change of the battery or battery pack in the first direction is detected by measuring the sensing capacitance between the two disconnected parts of the sensing component 100, and the shape change of the battery or battery pack in the second direction is detected by measuring the sensing capacitance between the sensing component 100 and the adjacent sensing component 100, wherein the first direction is substantially perpendicular to the second direction. The sensing component 100 is provided with a breakable position, so that when the shape change value of the battery or battery pack is greater than or equal to the change threshold, the sensing component 100 will be separated into two parts at the breakable position.

[0086] In the case where there are multiple induction components 100, when one or more induction components 100 are separated, adjacent induction components 100 of the one or more induction components 100 are grounded, and the shape change of the battery or battery pack is detected by detecting the capacitance generated between two parts of the one or more induction components 100.

[0087] In the capacitance measurement mode, capacitance will be generated between the inductive components that are disconnected into two parts. Therefore, by measuring the inductive capacitance, the deformation of the battery in a first direction (for example, the up and down direction in the figure) can be measured. As the deformation increases, the inductive capacitance will change accordingly. By measuring the changed inductive capacitance, the deformation amount of the battery can be obtained.

[0088] In addition, the deformation of the battery in the second direction can be measured by measuring the inductive capacitance between adjacent inductive components. The second direction can be, for example, the left-right direction. Figure 7 The deformation in the left and right directions can be measured by the capacitance between the first part of the sensing components marked as 100 and the sensing components on the left and / or right sides, and the corresponding deformation can also be measured by the capacitance between the sensing components at the diagonal positions.

[0089] The sensing component 100 is arranged on a film, and the film is attached to the outer surface or inner surface of the battery, or the outer surface or inner surface of the battery pack. The film, for example, can be provided with a plurality of sensing components, and the setting of the sensing components is achieved by sticking the film. The film can be flexible, and sensing components with a certain rigidity can be attached to the film. The sensing component can be made of suitable materials, such as various suitable metal materials such as aluminum, copper, silver, conductive composite materials, conductive ceramics, etc.

[0090] In one embodiment, when there are multiple sensing components 100, shielding components 120 are provided between the sensing components 100 to prevent capacitance effect from being formed between adjacent sensing components 100. In addition, shielding components may not be provided, and in the capacitance measurement mode, adjacent sensing components may be grounded.

[0091] According to a further embodiment of the present disclosure, for example Fig. 9 As shown, the battery detection device further includes a driving unit, which provides a driving signal to the sensing component 100 so that the collecting unit collects an electrical signal generated by the sensing component 100 based on the driving signal.

[0092] The battery detection device also includes: an analog-to-digital conversion unit, which receives the electrical signal from the acquisition unit and converts the electrical signal into a digital signal; and a filtering unit, which is used to filter the digital signal, wherein the filtering unit includes a low-pass filter and / or a nonlinear filter, and the filtered signal is transmitted to the processing unit.

[0093] The battery detection device also includes: a threshold updating unit, which receives the shape change of the battery or battery pack obtained by the processing unit, and updates the threshold used in the battery detection process based on the shape change; and / or a parameter adjustment unit, which receives the shape change of the battery or battery pack obtained by the processing unit, and adjusts the parameters used in the battery detection process based on the shape change, thereby adjusting at least one of the charging current parameter, the discharging current parameter, the temperature parameter, the power calculation parameter, and the battery model parameter.

[0094] The power calculation unit can calculate the power according to the adjusted parameters, for example, the power can be calculated by changing the parameters such as the battery model. The battery protection unit can control various control quantities such as charging current, discharging current, voltage, etc. according to the detected shape change, so as to ensure battery safety.

[0095] In addition, in the case of multiple sensing components, a switching unit may be used. The switching unit may include a switch element. The multiple sensing components are selected through the switching unit for driving and collecting.

[0096] According to an embodiment of the present disclosure, a battery management device is also provided, such as Fig. 9 As shown in the dotted box, except for the sensing component, other units can be integrated into the battery management device.

[0097] According to one embodiment of the present disclosure, a detection method of the above-mentioned battery detection device is also provided.

[0098] Fig.10 FIG. 4 is a flow chart of a detection method S100 according to an embodiment of the present disclosure. Fig.10 As shown, in step S102, the electrical signal of the sensing component 100 is collected, and in step S104, the shape change of the battery or battery pack is detected based on the change of the electrical signal of the sensing component 100. In step S102, the change of the electrical signal is caused by the change of the resistance value of the sensing component 100. When the shape of the battery or battery pack changes, the resistance value of the sensing component 100 changes accordingly.

[0099] Fig.11 A flow chart of a detection method S200 according to another embodiment of the present disclosure is provided. Fig.11 As shown, in step S202, the electrical signal of the sensing component 100 is collected, and in step S204, the shape change of the battery or battery pack is detected based on the change of the electrical signal of the sensing component 100. In step S202, the change of the electrical signal is caused by the change of the resistance value of the sensing component 100. When the shape of the battery or battery pack changes, the resistance value of the sensing component 100 changes accordingly.

[0100] The detection method S200 also includes step S206, determining whether the sensing component 100 is separated. If the sensing component 100 is separated, switching to capacitance detection mode S208. In the capacitance detection mode, in step S210, the shape change of the battery or battery pack is further detected by detecting the sensing capacitance between the sensing device separated into two parts.

[0101] In addition, the method may further include step S210, in which, when the sensing component 100 is not divided into two parts, the sensing capacitance between adjacent sensing components may be periodically tested to avoid the situation where the battery has been deformed but the sensing component is not disconnected. In this way, the sensing capacitance of the sensing component may be periodically detected to prevent this situation from occurring. Accordingly, a periodic switching module may be included, which may perform the above operations, and after the sensing capacitance detection is completed, if it is confirmed to be normal, continue to detect by resistance. If it is abnormal, an alarm is issued or switched to capacitance detection mode.

[0102] In the capacitance detection mode, the shape change of the battery or battery pack in a first direction is detected by detecting the inductive capacitance between the inductive devices separated into two parts, and the shape change of the battery or battery pack in a second direction is detected by detecting the inductive capacitance between adjacent inductive devices, and the first direction and the second direction are approximately perpendicular.

[0103] In the above two method embodiments, the collected electrical signal of the sensing component 100 may also be converted into digital form, and the digital signal after the analog-to-digital conversion may be filtered so as to obtain the shape change of the battery or the battery pack according to the filtered signal.

[0104] The threshold used in the battery detection process is updated according to the shape change, and / or the parameters used in the battery detection process are adjusted according to the shape change. For example, the parameters of the battery model can be adjusted. In addition, the battery charge and discharge current, charge and discharge overvoltage, etc. can also be adjusted according to the adjusted parameters. In the event of a safety threshold, an alarm signal can also be output externally.

[0105] In the embodiment of the present disclosure, an analog-to-digital conversion unit is used to perform analog-to-digital conversion on the detected deformation signal. However, there is usually a lot of interference in the output of the analog conversion unit. Therefore, a novel analog-to-digital conversion unit and a corresponding filtering unit are also provided in the present disclosure.

[0106] Fig.12 An analog-to-digital conversion unit 200 according to the present disclosure and a filtering unit formed of a low-pass filtering unit 300 and a random jump filtering unit 500 are shown.

[0107] The analog-to-digital conversion unit 200 may include a first integration unit 310 , a second integration unit 320 , and a quantization unit 230 .

[0108] The first integration unit 310 is used to receive an analog input signal, and perform modulation conversion on the analog input signal to generate a first integration signal.

[0109] The second integration unit 320 receives the first integration signal and performs modulation conversion on the first integration signal to generate a second integration signal.

[0110] The quantization unit 230 is used to compare the second integrated signal with the reference signal, and generate a digital code stream with analog input signal information based on the second integrated signal and the reference signal.

[0111] The low-pass filter unit 300 may be used to perform shaping filtering on out-of-band noise in the digital bit stream output by the quantization unit 230 .

[0112] The random jitter filtering unit 500 performs filtering processing on the shaped filtered signal of the low-pass filtering unit 300 to eliminate random jitter data in the shaped filtered signal, and generates a digital output signal corresponding to the analog input signal.

[0113] The first integration unit 310 may be in the form of a switched capacitor integrator. According to a preferred example of the present disclosure, the following is provided: Fig.13 The switched capacitor integrator shown in the figure has the advantages of high time constant accuracy, good temperature characteristics and easy clock control.

[0114] like Fig.13 As shown, the first integration unit 310 may be composed of a switch, a capacitor and an operational amplifier.

[0115] One end of the first switch S1-1 is connected to the first analog input signal terminal Vip, and the other end is connected to one end of the first sampling capacitor C1. The other end of the first sampling capacitor C1 is connected to the positive input terminal of the first operational amplifier OP1 via the second switch S6-1. One end of the third switch S2-1 is connected to the first analog signal input terminal, and the other end is connected to one end of the second sampling capacitor C2. The other end of the second sampling capacitor C2 is connected to the negative input terminal of the first operational amplifier OP1 via the fourth switch S6-2. One end of the fifth switch S1-2 is connected to the second analog input signal terminal Vin, and the other end is connected to one end of the second sampling capacitor C2. The other end of the second sampling capacitor C2 is connected to the negative input terminal of the first operational amplifier OP1 via the fourth switch S6-2. The other end of the seventh switch S2-2 is connected to the second analog input signal terminal Vin, and the other end is connected to one end of the first sampling capacitor C1.

[0116] The other end of the first switch S11 is connected to the positive reference voltage terminal Vr+ via the seventh switch S3 - 1 , and is connected to the negative reference voltage terminal Vr− via the eighth switch S4 - 1 .

[0117] The other end of the fifth switch S1 - 2 is connected to the positive reference voltage terminal Vr+ via the ninth switch S3 - 2 , and is connected to the negative reference voltage terminal Vr− via the tenth switch S4 - 2 .

[0118] A connection node between the first sampling capacitor C1 and the second switch S6 - 1 is connected to the regulation voltage Vcmi via the eleventh switch, and a connection node between the second sampling capacitor C2 and the fourth switch S6 - 2 is connected to the regulation voltage Vcmi via the twelfth switch (the regulation voltage may be determined according to actual conditions).

[0119] In addition, the negative output terminal of the first operational amplifier OP1 is connected to the positive input terminal via the first integrating capacitor C3 , and the positive output terminal of the first operational amplifier OP1 is connected to the negative input terminal via the second integrating capacitor C4 .

[0120] Through the first integration unit 310, in the first phase of the switch control signal, the integration capacitor in the first integration unit 310 samples the analog input signal by controlling the on and off of the switch. In the second phase of the switch control signal, the signal of the integration capacitor in the first integration unit 310 is transmitted to the integration capacitor by controlling the on and off of the switch, and the operation is performed cyclically.

[0121] Preferably, the first sampling capacitor and the second sampling capacitor are symmetrical and have the same capacitance value, and the first integrating capacitor and the second integrating capacitor are symmetrical and have the same capacitance value. With this structure, a smaller sampling capacitor can be used, and the stability is better. This is because Fig.13 The structure shown adopts a structure that is insensitive to parasitics, so it can achieve better adaptability to some physical parasitics and some non-ideal factors, and also adopt smaller capacitors accordingly.

[0122] Fig.14 FIG. 3 is a specific circuit diagram of the second integration unit 320 according to an embodiment of the present disclosure. The novel switched capacitor integrator has the advantages of high time constant accuracy, good temperature characteristics, and easy clock control.

[0123] One end of the thirteenth switch W1-1 is connected to the positive output terminal V1+ of the first operational amplifier OP1, and the other end is connected to one end of the third sampling capacitor C5. The other end of the third sampling capacitor C5 is connected to the positive input terminal of the second operational amplifier OP2 via the fourteenth switch W3-1. The other end of the thirteenth switch W1-1 is connected to the external voltage Vcm via the fifteenth switch W2-1, and the other end of the third sampling capacitor C5 is connected to the adjustment voltage Vcmi via the sixteenth switch W4-1. One end of the seventeenth switch W1-2 is connected to the negative output terminal V1- of the first operational amplifier OP1, and the other end is connected to one end of the fourth sampling capacitor C6. The other end of the fourth sampling capacitor C6 is connected to the negative input terminal of the second operational amplifier OP2 via the eighteenth switch W3-2. The other end of the seventeenth switch W1-2 is connected to the external voltage Vcm via the nineteenth switch W2-2, and the other end of the fourth sampling capacitor C6 is connected to the adjustment voltage Vcmi via the twentieth switch W4-2.

[0124] In addition, the negative output terminal V2- of the second operational amplifier OP2 is connected to the positive input terminal via the third integrating capacitor C7, and the positive output terminal V2+ of the second operational amplifier OP2 is connected to the negative input terminal via the fourth integrating capacitor C8.

[0125] In order to achieve precise measurement requirements, according to a preferred embodiment of the present disclosure, a gain-enhanced operational amplifier structure is also provided in the present disclosure, wherein the operational amplifier structure can be used as the first operational amplifier structure and the second operational amplifier structure described above.

[0126] Fig.15 A schematic diagram showing an operational amplifier structure according to the present disclosure is shown.

[0127] The structure of the operational amplifier is:

[0128] The source of the first PMOS transistor M0 is connected to the system voltage, the gate of the first PMOS transistor M0 is connected to the control voltage to control its on and off, the drain of the first PMOS transistor is connected to the source of the second PMOS transistor M1 and the source of the third PMOS transistor M2, the gate of the second PMOS transistor M1 and the gate of the third PMOS transistor M2 are connected to the positive input terminal and the negative input terminal respectively, the drain of the second PMOS transistor M1 and the drain of the third PMOS transistor M2 are connected to the negative input terminal and the positive input terminal of the first amplifier An respectively, and the negative input terminal and the positive input terminal of the first amplifier An are grounded through the first NMOS transistor M4 and the second NMOS transistor M3 respectively, and the gates of the first NMOS transistor M4 and the second NMOS transistor M3 are connected.

[0129] The negative output terminal and the positive output terminal of the first amplifier An are respectively connected to the gates of the third NMOS transistor M5 and the fourth NMOS transistor M6, and the sources of the third NMOS transistor M5 and the fourth NMOS transistor M6 are respectively connected to the positive input terminal and the negative input terminal of the first amplifier An. The drains of the third NMOS transistor M5 and the fourth NMOS transistor M6 serve as the output terminals of the operational amplifier.

[0130] The sources of the fourth PMOS transistor M9 and the fifth PMOS transistor M10 are connected to the system voltage, the gates of the fourth PMOS transistor M9 and the fifth PMOS transistor M10 are connected, the drains of the fourth PMOS transistor M9 and the fifth PMOS transistor M10 are respectively connected to the negative input terminal and the positive input terminal of the second amplifier Ap and are respectively connected to the sources of the sixth PMOS transistor M7 and the seventh PMOS transistor M8, and the gates of the sixth PMOS transistor M7 and the seventh PMOS transistor M8 are respectively connected to the positive output terminal and the negative output terminal of the second amplifier Ap and are respectively connected to the drains of the third NMOS transistor M5 and the fourth NMOS transistor M6.

[0131] Fig.16 A circuit diagram of a quantization unit according to the present disclosure is provided in the quantizer, in which a pre-amplification circuit and a latch may be included, wherein the pre-amplification circuit amplifies the input signal (the output signal of the second integration unit) to a predetermined degree (predetermined gain), and the latch latches the amplified signal. Fig.16 In the circuit structure shown, the output terminals Q and QB serve as the output terminals of the quantizer.

[0132] For Fig.13 The first integration unit shown and Fig.14 The switch control in the second integration unit shown can be implemented as follows: Fig.17 The clock signal generated by the clock generating circuit shown is controlled.

[0133] pass Fig.17 The clock generation circuit can generate three two-phase non-overlapping clocks (clk1, clk2; clk1', clk2'; clk1", clk2"), which can ensure the correctness of the timing of the analog-to-digital conversion device. Fig.13 and Fig.14 The switch shown is controlled. This allows the circuit to work alternately under different control signals.

[0134] In addition, according to a preferred embodiment of the present disclosure, a chopper circuit may be provided in the analog-to-digital conversion unit 200 . Fig.18 A circuit diagram of a chopper circuit is shown.

[0135] The chopper circuit can be set as Fig.13 The operational amplifier and the integral capacitor shown in the figure can be used to eliminate the offset voltage of the operational amplifier by selecting or turning off the chopper circuit. A lower offset voltage can be achieved by the chopper circuit disclosed in the present invention. Specifically, the chopper circuit can modulate the offset voltage to a high frequency and then filter it out. The original signal remains in its original state and is not affected.

[0136] The chopper circuit is mainly composed of two switches, which are controlled by a certain timing. In the first phase, INP is connected to OUTP, and INN is connected to OUTN. In the second phase, INP is connected to OUTN, and INN is connected to OUTP. This way, two modulations are achieved, and the offset voltage is modulated to the position of the clock phase frequency. The original signal is also modulated, but the second modulation modulates it back to its original position and will not be affected.

[0137] The low-pass filtering unit 300 is used to perform shaping filtering on the out-of-band noise in the digital bit stream output by the quantization unit.

[0138] Fig.19 A schematic diagram of a low-pass filtering unit 300 according to one embodiment of the present disclosure is given.

[0139] like Fig.19 As shown, the low-pass filter unit 300 may include two stages of cascaded digital filters, a first stage digital filter 310 and a second stage digital filter 320. The digital filter used may be a FIR low-pass digital filter.

[0140] The structures of the first-stage digital filter 310 and the second-stage digital filter 320 may be the same.

[0141] The first-stage digital filter 310 may include only the first-stage adder 311 and the first-stage register 312 , and no multiplication unit is required in the first-stage digital filter 310 .

[0142] The first-stage adder 311 receives the output Q of the quantizer 230, and the first-stage adder 311 is connected to the first-stage register 312, and the first-stage adder 311 is also connected to the output of the first-stage register 312. Through the first-stage digital filter 310, after receiving an output data of the quantizer 230, the first-stage adder 311 adds the output data to the previous output data (obtained from the output of the first-stage register 312), and the added data is transmitted from the first-stage adder 311 to the first-stage register 312, and is saved by the first-stage register 312, and then waits for the next input data. When a new data is received from the quantizer 230 again, the first-stage adder 311 adds the new data to the data saved in the register, and the added data is output to the first-stage register 312, and the first-stage register 312 saves it, and the cycle is performed in this way, thereby completing the accumulation and saving process.

[0143] The second-stage adder 321 receives the output of the first-stage register 312, and the second-stage adder 321 is connected to the second-stage register 322, and the second-stage adder 321 is also connected to the output of the second-stage register 322. Through the second-stage digital filter 320, after receiving an output data of the first-stage register 312, the second-stage adder 321 adds the output data to the previous output data (obtained from the output of the second-stage register 322), and the added data is transmitted from the second-stage adder 321 to the second-stage register 322, and is saved by the second-stage register 322, and then waits for the next input data. When a new data is received from the first-stage register 312 again, the new data is added to the data saved in the register through the second-stage adder 321, and the added data is output to the second-stage register 322, and the second-stage register 322 saves it, and the cycle is performed in this way, thereby completing the accumulation and saving process.

[0144] In addition, the output of the second-stage adder 321 can be used as the output of the low-pass filtering unit 300 .

[0145] In addition, a down-sampling module and a gain module may be added at the rear end of the low-pass filtering unit 300 .

[0146] In this digital filter of the low-pass filter, there is no need to use a multiplication unit, and the filter is only composed of an adder and a register, which has the advantages of small hardware resources, high execution efficiency, and small group delay.

[0147] exist Fig.19It is also shown in FIG. 3 that the low-pass filter unit 300 may further include a third-stage digital filter 330 and a fourth-stage digital filter 340 . In this case, the output of the adder 241 of the fourth-stage digital filter 340 may be used as the output of the low-pass filter unit 300 .

[0148] The third-stage adder 331 receives the output of the second-stage register 322, and the third-stage adder 331 is connected to the third-stage register 332, and the third-stage adder 331 is also connected to the output of the third-stage register 332. Through the third-stage digital filter 330, after receiving an output data of the second-stage filter 320, the third-stage adder 331 adds the output data to the previous output data (obtained from the output of the third-stage register 332), and the added data is transmitted from the third-stage adder 331 to the third-stage register 332, and is saved by the third-stage register 332, and then waits for the next input data. When a new data is received from the second-stage digital filter 320 again, the new data is added to the data saved in the register through the third-stage adder 331, and the added data is output to the third-stage register 332, and the third-stage register 332 is saved, and the cycle is performed in this way, thereby completing the accumulation and saving process.

[0149] The fourth-stage adder 341 receives the output of the third-stage register 332, and the fourth-stage adder 341 is connected to the fourth-stage register 342, and the fourth-stage adder 341 is also connected to the output of the fourth-stage register 342. Through the fourth-stage digital filter 340, after receiving an output data of the third-stage register 332, the fourth-stage adder 341 adds the output data to the previous output data (obtained from the output of the fourth-stage register 342), and the added data is transmitted from the fourth-stage adder 341 to the fourth-stage register 342, and is saved by the fourth-stage register 342, and then waits for the next input data. When a new data is received from the third-stage register 332 again, the fourth-stage adder 341 adds the new data to the data saved in the register, and the added data is output to the fourth-stage register 342, and the fourth-stage register 342 saves it, and the cycle is performed in this way, thereby completing the accumulation and saving process.

[0150] The random jump filter unit 500 will be described below.

[0151] The random jump filter unit 500 can process the signal after the shaping filter of the low-pass filter unit through the noise coefficient matrix, wherein the noise coefficient matrix can be expressed as N(a)=(a 1 , a 2 ,……,a i ), where i is an integer greater than or equal to 2.

[0152] The noise factor matrix is ​​determined by the system noise characteristics of the analog-to-digital conversion device and varies according to the system noise characteristics.

[0153] The random jump filter unit can perform filtering processing on each bit of data in the N effective bits of the analog-to-digital conversion device, wherein each bit of data is respectively connected to a random jump filter unit.

[0154] The random jump filter unit can also filter m bits of data out of the N effective bits of the analog-to-digital conversion device at the same time, and the m bits of data are connected to one random jump filter unit. For example, if N is 12 bits and m is set to 3 bits, one random jump filter unit can be connected to every 3 bits of the 12 bits, so that a total of 4 random jump filter units can be connected.

[0155] The following is an explanation of the processing of one bit of data (eg, the least significant bit LSM), wherein the number of historical data of the bit of data is n, where n is greater than or equal to 2.

[0156] Get the least significant bit of n historical data: D 1 , D 2 ,……,D n And the n historical data are combined with the above noise coefficient matrix to determine the output data D out , for example, can be expressed as follows:

[0157] (a 1 ×D 1 +a 2 ×D 2 +……+a n ×D n ) / G=D out .

[0158] The data of the coefficient G can select a suitable value according to the actual requirements of the analog-to-digital conversion device.

[0159] In this way, even if the data is disturbed to a certain extent, it still appears stable from the outside.

[0160] Therefore, in the battery detection device of the present disclosure, it is necessary to accurately detect the deformation of the battery so as to perform relevant subsequent processing. In the present disclosure, by using the above-mentioned analog-to-digital converter and filtering unit, the inductive capacitor electrical signal can be well collected with high precision and the disturbance factors can also be effectively removed.

[0161] According to a further embodiment of the present disclosure, Fig. 20As shown, a battery management system is also provided, including: a battery detection device on, the battery detection device is used to detect the shape change of the battery or battery pack.

[0162] In the description of this specification, the description with reference to the terms "one embodiment / method", "some embodiments / methods", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment / method or example are included in at least one embodiment / method or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment / method or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments / methods or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments / methods or examples described in this specification and the features of different embodiments / methods or examples, unless they are contradictory.

[0163] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0164] Those skilled in the art should understand that the above embodiments are only for the purpose of clearly illustrating the present disclosure, and are not intended to limit the scope of the present disclosure. For those skilled in the art, other changes or modifications may be made based on the above disclosure, and these changes or modifications are still within the scope of the present disclosure.

Claims

1. A battery detection device, characterized in that: include: A sensing component, wherein the sensing component is arranged on the outer surface or inner surface of the battery, or the outer surface or inner surface of the battery pack, so that when the shape of the battery or the battery pack changes, the shape of the sensing component changes accordingly, so that the sensing component can reflect the shape change of the battery or the battery pack, and the sensing component includes one or more sensing components arranged along the outer surface or inner surface of the battery, or the outer surface or inner surface of the battery pack, wherein when the shape of the sensing component changes, the resistance value of the sensing component changes accordingly, and a change electrical signal is obtained through the changed resistance value; a collection unit, the collection unit being electrically connected to the sensing component, so that when the shape of the sensing component changes, the collection unit collects the changed electrical signal caused by the change in the shape of the sensing component; as well as a processing unit, wherein the processing unit determines the shape change of the battery or battery pack according to the changed electrical signal collected by the collecting unit, Among them, when the shape change value of the battery or battery pack is greater than or equal to the change threshold, the sensing component can be separated and is in a separated state; when the shape change value of the battery or battery pack is less than the change threshold, the sensing component is in a connected state; the battery detection device judges the shape change of the battery or battery pack by the separated state and the connected state of the sensing component; when the sensing component is separated into two parts, the shape change in the first direction of the battery or battery pack is detected by collecting the sensing capacitance between the two parts of the sensing component.

2. The device according to claim 1, characterized in that Each inductive component is integrally formed and connected, or, Each sensing component includes two parts, and the ends of the two sensing components are in contact with each other or overlap with each other to form a contact state.

3. The device according to claim 1, characterized in that In the case where the induction component is a plurality of induction components, when at least one of the induction components is separated, the shape change of the battery or battery pack in a first direction is detected by measuring the induction capacitance between the two disconnected parts of the induction components, and the shape change of the battery or battery pack in a second direction is detected by measuring the induction capacitance between the induction component and an adjacent induction component, wherein the first direction is substantially perpendicular to the second direction.

4. The device according to claim 1, characterized in that The sensing component is provided with a breakable position, so that when the shape change value of the battery or battery pack is greater than or equal to a change threshold, the sensing component will be separated into two parts at the breakable position.

5. The device according to any one of claims 1 to 4, characterized in that The sensing component is arranged on a film, and the film is attached to the outer surface or inner surface of the battery, or the outer surface or inner surface of the battery pack.

6. The device according to any one of claims 1 to 4, characterized in that In the case that there are a plurality of inductive components, shielding components are provided between the inductive components to prevent a capacitive effect from being formed between adjacent inductive components.

7. The device according to any one of claims 1 to 4, characterized in that In the case where there are multiple induction components, when one or more induction components are separated, adjacent induction components of the one or more induction components are grounded, and the shape change of the battery or battery pack is detected by detecting the capacitance generated between two parts of the one or more induction components.

8. The device according to any one of claims 1 to 4, characterized in that The battery detection device further includes a driving unit, which provides a driving signal to the sensing component so that the collecting unit collects an electrical signal generated by the sensing component based on the driving signal.

9. The device according to any one of claims 1 to 4, characterized in that The battery detection device also includes: an analog-to-digital conversion unit, the analog-to-digital conversion unit receiving the electrical signal from the acquisition unit and converting the electrical signal into a digital signal; and A filtering unit, the filtering unit is used to filter the digital signal, wherein the filtering unit includes a low-pass filter and / or a nonlinear filter, and the filtered signal is transmitted to the processing unit.

10. The device according to claim 9, characterized in that The battery detection device also includes: a threshold updating unit, the threshold updating unit receiving the shape change amount of the battery or battery pack obtained by the processing unit, and updating a threshold used in a battery detection process based on the shape change amount; and A parameter adjustment unit, wherein the parameter adjustment unit receives the shape change of the battery or battery pack obtained by the processing unit, and adjusts the parameters used in the battery detection process based on the shape change, thereby adjusting at least one of the charging current parameter, the discharging current parameter, the temperature parameter, the power calculation parameter, and the battery model parameter.

11. The device according to claim 10, characterized in that The battery detection device also includes: a power calculation unit, the power calculation unit being capable of calculating the power of the battery according to the parameters adjusted by the parameter adjustment unit; and / or A protection unit is configured to adjust a charging current and / or a discharging current based on the shape change amount.

12. A detection method for a battery detection device according to any one of claims 1 to 11, characterized in that: include: collecting the electrical signal of the sensing component; as well as The change in shape of the battery or battery pack is detected based on the change in the electrical signal of the sensing component.

13. The method according to claim 12, characterized in that The change of the electrical signal is caused by the change of the resistance value of the sensing component. When the shape of the battery or the battery pack changes, the resistance value of the sensing component changes accordingly.

14. The method according to claim 13, characterized in that It also includes determining whether the sensing component is separated, and if the sensing component is separated, switching to a capacitance detection mode, in which the shape change of the battery or battery pack is further detected by detecting the sensing capacitance between the sensing components separated into two parts; or Regardless of whether the inductive component is disconnected, the cycle switches to the capacitance detection mode.

15. The method according to claim 14, characterized in that In the capacitance detection mode, the shape change of the battery or battery pack in a first direction is detected by detecting the inductive capacitance between the inductive devices separated into two parts, and the shape change of the battery or battery pack in a second direction is detected by detecting the inductive capacitance between adjacent inductive devices, and the first direction and the second direction are substantially perpendicular.

16. The method according to claim 14, characterized in that The method also includes performing analog-to-digital conversion on the collected electrical signal of the sensing component and filtering the digital signal after the analog-to-digital conversion, so as to obtain the shape change of the battery or battery pack according to the filtered signal.

17. The method according to claim 16, characterized in that A threshold used in a battery detection process is updated according to the shape change amount, and / or a parameter used in a battery detection process is adjusted according to the shape change amount.

18. A battery management system, characterized in that: include: The battery detection device according to any one of claims 1 to 11, wherein the battery detection device is used to detect a change in shape of the battery or battery pack.

19. A battery management device, characterized in that: The battery management device integrates other units except the sensing component in the device according to any one of claims 1 to 11.

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