CN214895704U

CN214895704U - Battery detection device and battery management system

Info

Publication number: CN214895704U
Application number: CN202121063190.3U
Authority: CN
Inventors: 周号
Original assignee: Zhuhai Maiju Microelectronics Co Ltd
Current assignee: Zhuhai Maiju Microelectronics Co Ltd
Priority date: 2021-05-18
Filing date: 2021-05-18
Publication date: 2021-11-26
Anticipated expiration: 2031-05-18

Abstract

The present disclosure provides a battery detection apparatus, including: the sensing component, the acquisition unit is connected with the sensing component electricity to and the processing unit, the processing unit handles the change signal of telecommunication of acquisition unit's collection. The present disclosure also provides a battery management system.

Description

Battery detection device and battery management system

Technical Field

The present disclosure relates to a battery detection device and a battery management system.

Background

Rechargeable batteries are widely used at present, but the batteries are aged during the charging and discharging processes of the batteries, and the aging of the batteries may generate a safety factor. For example, during charging and discharging, the battery may deform to a certain extent, and the battery may explode.

For safety reasons, deformation of the battery needs to be detected, and the deformation detection method in the prior art may not be accurate enough and is too high in cost.

Therefore, in order to prevent a safety accident, it is necessary to effectively and accurately detect the deformation of the battery.

SUMMERY OF THE UTILITY MODEL

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

According to an aspect of the present disclosure, there is provided a battery inspection apparatus including:

the sensing component is arranged on the outer surface or the inner surface of a battery or the outer surface or the inner surface of a battery pack, so that the shape of the sensing component is correspondingly changed under the condition that the shape of the battery or the battery pack is changed, and the sensing component can reflect the shape change of the battery or the battery pack;

the acquisition unit is electrically connected with the sensing component so as to acquire a changed electric signal caused by the change of the shape of the sensing component when the shape of the sensing component is changed; and

and the processing unit judges the shape change of the battery or the battery pack according to the change electric signal acquired by the acquisition unit.

According to at least one embodiment of the present disclosure, the sensing member includes one or more sensing members disposed along an outer or inner surface of the battery, or an outer or inner surface of a battery pack.

According to at least one embodiment of the present disclosure, when the shape of the sensing member changes, the resistance value of the sensing member changes accordingly, and the change electric signal is obtained from the changed resistance value.

According to at least one embodiment of the present disclosure, the sensing part may be separated when the shape change value of the battery or the battery pack is equal to or greater than a change threshold value, the sensing part may be in a connected state when the shape change value of the battery or the battery pack is less than the change threshold value,

the battery detection device judges the shape change of the battery or the battery pack according to the separation state and the connection state of the induction component.

According to at least one embodiment of the present disclosure, each sensing part is integrally formed and forms a successive state, or,

each sensing part comprises two parts, and the ends of the two parts of the sensing parts are mutually contacted or oppositely overlapped so as to form a contact state.

According to at least one embodiment of the present disclosure, when the sensing part is divided into two parts, the shape change of the first direction of the battery or the battery pack is detected by collecting the sensing capacitance between the two parts of the sensing part.

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

According to at least one embodiment of the present disclosure, the sensing part is provided with a breakage facilitating position so that the sensing part is divided into two parts at the breakage facilitating position when a shape change value of the battery or the battery pack is equal to or greater than a change threshold value.

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

According to at least one embodiment of the present disclosure, in a case where the number of the sensing parts is plural, a shielding part is disposed between the sensing parts to prevent a capacitive effect from being formed between adjacent sensing parts.

According to at least one embodiment of the present disclosure, in the case where the number of the sensing parts is plural, in the case where one or more sensing parts are separated, adjacent sensing parts of the one or more sensing parts are grounded, and the shape change of the battery or the battery pack is detected by detecting a capacitance generated between two sensing parts of the one or more sensing parts.

According to at least one embodiment of the present disclosure, the battery detection apparatus further includes a driving unit, and the driving unit 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.

According to at least one embodiment of the present disclosure, the battery detection apparatus further includes:

an analog-to-digital conversion unit that receives the electrical signal from the acquisition unit and converts the electrical signal to a digital signal; and

and the filtering unit is used for filtering the digital signal, the filtering unit comprises a low-pass filter and/or a nonlinear filter, and the filtered signal is transmitted to the processing unit.

a threshold updating unit that receives the shape change amount of the battery or battery pack obtained by the processing unit and updates a threshold used in a battery detection process based on the shape change amount; and/or

And the parameter adjusting unit receives the shape variation of the battery or the battery pack obtained by the processing unit and adjusts parameters used in the battery detection process based on the shape variation so as to adjust at least one of a charging current parameter, a discharging current parameter, a temperature parameter, an electric quantity calculation parameter and a battery model parameter.

the electric quantity calculating unit can calculate the electric quantity of the battery according to the parameters adjusted by the parameter adjusting unit; and/or

A protection unit that adjusts a charging current and/or a discharging current based on the shape change amount.

According to another aspect of the disclosure, a method of detection as described in any of the above, comprising:

collecting an electric signal of the induction component; and

detecting a change in shape of the battery or battery pack based on a change in the electrical signal of the sensing member.

According to at least one embodiment of the present disclosure, the change in the electrical signal is caused by a change in a resistance value of the sensing member, and in a case where the shape of the battery or the battery pack is changed, the resistance value of the sensing member is changed accordingly.

According to at least one embodiment of the present disclosure, the method further includes determining whether the sensing parts are separated, and in case the sensing parts are separated, switching to a capacitance detection mode in which a shape change of the battery or the battery pack is further detected by detecting an induced capacitance between the sensing devices separated into two parts, or

And periodically switching to a capacitance detection mode whether the sensing part is disconnected or not.

According to at least one embodiment of the present disclosure, in the capacitance detection mode, a shape change of the battery or the battery pack in a first direction is detected by detecting an induced capacitance between the induction devices divided into two parts, and a shape change of the battery or the battery pack in a second direction is detected by detecting an induced capacitance between adjacent induction devices, the first direction and the second direction being substantially perpendicular.

According to at least one embodiment of the present disclosure, the method further includes performing analog-to-digital conversion on the acquired electrical signal of the sensing component, and filtering the analog-to-digital converted digital signal, so as to obtain the shape change amount of the battery or the battery pack according to the filtered signal.

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

According to still another aspect of the present disclosure, a battery management system includes: the battery detection device of any one of the above claims, wherein the battery detection device is configured to detect a change in shape of the battery or battery pack.

Drawings

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

Fig. 1 shows a schematic diagram of a battery test apparatus according to one embodiment of the present disclosure.

Fig. 2 shows a schematic diagram of a battery test apparatus according to one embodiment of the present disclosure.

Fig. 3 shows a schematic diagram of a battery test apparatus according to one embodiment of the present disclosure.

Fig. 4 shows a schematic diagram of a battery test apparatus according to one embodiment of the present disclosure.

Fig. 5 shows a schematic view of an inductive component according to an embodiment of the present disclosure.

Fig. 6 shows a schematic view of an inductive component according to an embodiment of the present disclosure.

Fig. 7 shows a schematic view of an inductive component according to an embodiment of the present disclosure.

Fig. 8 shows a schematic view of an inductive component according to an embodiment of the present disclosure.

Fig. 9 shows a schematic diagram of a battery test apparatus according to one embodiment of the present disclosure.

Fig. 10 shows a flow chart of a battery detection method according to one embodiment of the present disclosure.

Fig. 11 shows a flow chart of a battery detection method according to one embodiment of the present disclosure.

Fig. 12 shows a schematic diagram of an analog-to-digital conversion apparatus according to an embodiment of the present disclosure.

Fig. 13 shows a circuit diagram of a first stage integration unit according to one embodiment of the present disclosure.

Fig. 14 shows a circuit diagram of a second stage integration unit according to an embodiment of the present disclosure.

Fig. 15 shows a circuit diagram of an operational amplifier according to one embodiment of the present disclosure.

Fig. 16 shows a circuit diagram of a quantization unit according to an embodiment of the present disclosure.

Fig. 17 shows a circuit diagram of a clock generation unit according to an embodiment of the present disclosure.

Fig. 18 shows a circuit diagram of a chopper circuit according to an embodiment of the present disclosure.

Fig. 19 shows a circuit diagram of a low-pass filtering unit according to an embodiment of the present disclosure.

Fig. 20 shows a schematic diagram of a battery management system according to one embodiment of the present disclosure.

Detailed Description

The present disclosure will be described in further detail with reference to the drawings and embodiments. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limitations of the present disclosure. It should be further noted that, for the convenience of description, only the portions relevant to the present disclosure are shown in the drawings.

It should be noted that the embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict. Technical solutions of the present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Unless otherwise indicated, the illustrated exemplary embodiments/examples are to be understood as providing exemplary features of various details of some ways in which the technical concepts of the present disclosure may be practiced. Accordingly, unless otherwise indicated, features of the various embodiments may be additionally combined, separated, interchanged, and/or rearranged without departing from the technical concept of the present disclosure.

The use of cross-hatching and/or shading in the drawings is generally used to clarify the boundaries between adjacent components. As such, unless otherwise noted, the presence or absence of cross-hatching or shading does not convey or indicate any preference or requirement for a particular material, material property, size, proportion, commonality between the illustrated components and/or any other characteristic, attribute, property, etc., of a component. Further, in the drawings, the size and relative sizes of components may be exaggerated for clarity and/or descriptive purposes. While example embodiments may be practiced differently, the specific process sequence may be performed in a different order than that described. For example, two processes described consecutively may be performed substantially simultaneously or in reverse order to that described. In addition, like reference numerals denote like parts.

When an element is referred to as being "on" or "on," "connected to" or "coupled to" another element, it can be directly on, connected or coupled to the other element or intervening elements may be present. However, when an element is referred to as being "directly on," "directly connected to" or "directly coupled to" another element, there are no intervening elements present. For purposes of this disclosure, the term "connected" may refer to physically, electrically, etc., and may or may not have intermediate components.

For descriptive purposes, the present disclosure may use spatially relative terms such as "below … …," below … …, "" below … …, "" below, "" above … …, "" above, "" … …, "" higher, "and" side (e.g., as in "side wall") to describe one component's relationship to another (other) component as illustrated in the figures. 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 figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below … …" can encompass both an orientation of "above" and "below". Further, the devices may be otherwise positioned (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

The terminology used herein is for the purpose of describing particular embodiments 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, when the terms "comprises" and/or "comprising" and variations thereof are used in this specification, the presence of stated features, integers, steps, operations, elements, components and/or groups thereof are stated but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and/or groups thereof. It is also noted that, as used herein, the terms "substantially," "about," and other similar terms are used as approximate terms and not as degree terms, and as such, are used to interpret inherent deviations in measured values, calculated values, and/or provided values that would be recognized by one of ordinary skill in the art.

According to one embodiment of the present disclosure, a battery test device is provided. The battery of the present disclosure may be a rechargeable battery, such as a lithium ion battery or the like.

Several forms of the battery test apparatus according to the embodiment of the present disclosure are shown in fig. 1 to 4, and it should be noted that the idea of the present disclosure is not limited to the several forms shown in the drawings, and other suitable forms may be used in the present disclosure, for example, the sensing part 100 has a curved shape or other suitable shapes. For example, fig. 1 shows the sensing part 100 in the form of a band or a bar, fig. 2 shows the sensing part 100 as a whole in the form of a band or a bar, and a notch is further provided as the frangible point 100. While sensing element 100 is shown in a curved, strip-like position in fig. 3, sensing element 100 may have other shapes as shown in fig. 4. In the present disclosure, the sensing part 100 may be disposed along one direction of the battery, and may also be disposed along two directions of the battery, for example, the two directions may be at any angle, for example, 90 degrees, etc. For example, a mesh-shaped sensing member 100 may be provided.

As shown in fig. 1 to 4, the battery test apparatus 10 may include a sensing part 100, an acquisition unit, a processing unit, and the like.

The sensing part 100, the sensing part 100 is arranged on the outer surface or the inner surface of the battery or the outer surface or the 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 part 100 changes accordingly, thereby enabling the sensing part 100 to reflect the shape change of the battery or the battery pack.

The outer package of the battery or battery pack may be a flexible package and may be capable of deforming as the battery itself deforms.

The collecting unit is electrically connected to the sensing part 100 so that when the shape of the sensing part 100 is changed, the collecting unit collects a changed electrical signal caused by the change of the shape of the sensing part 100.

The processing unit judges the shape change of the battery or the battery pack according to the change electric signal acquired by the acquisition unit.

In a preferred embodiment of the present disclosure, the sensing member 100 includes one or more sensing members 100 disposed along an outer or inner surface of the battery, or an outer or inner surface of the battery pack. For example, fig. 1 to 4 show a case where only one is provided, and fig. 5 to 6 show a case where a plurality of (two or more in the present disclosure) are provided.

Fig. 5 and 6 show two shapes of the inductive component, and a plurality of inductive components of other shapes may be provided. As shown in fig. 5 to 6, the plurality of sensing parts may extend in parallel along the first direction. In addition, in the present disclosure, the extending directions of the plurality of sensing parts may also be different and may also intersect.

According to the embodiment of the present disclosure, when the shape of the sensing member 100 changes, the resistance value of the sensing member 100 changes accordingly, and a change electric signal is obtained from the changed resistance value. When the shape change value of the battery or the battery pack is greater than or equal to the change threshold value, the sensing part 100 can be separated, and when the shape change value of the battery or the battery pack is smaller than the change threshold value, the sensing part 100 is in the connection state, and the battery detection device judges the shape change of the battery or the battery pack according to the separation state and the connection state of the sensing part 100.

Each sensing part 100 is integrally formed and formed in a continuous state, or each sensing part 100 includes two parts, and ends of the two parts of sensing part 100 are in contact with each other or are overlapped with each other so as to form a contact state.

That is, in the present disclosure, the sensing part may be in two states, the first state being a connected state and the second state being a separated state, along with the deformation of the battery or the battery pack. In the connected state, a resistance measurement mode can be used, and in the separated state, a capacitance measurement mode can be used. This avoids that, in the case of using the resistance measurement mode, when the sensing parts are in the separated state, since for a certain sensing part it is already disconnected, it will no longer be able to measure by the resistance measurement mode, so that it will not monitor the deformation of the battery continuously.

According to the idea 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.

In the case of the resistance measurement mode, when the deformation occurs, the resistance value of the sensing member will change accordingly, a fixed voltage may be applied to the sensing member, the change in the current may be caused by the change in the resistance, and the deformation of the battery may be reflected by detecting the change in the current.

In the capacitance measurement mode, when the sensing part 100 is divided into two parts, the shape change of the first direction of the battery or the battery pack is detected by collecting the sensing capacitance between the two parts of the sensing part 100. In the case where the sensing part 100 is a plurality of sensing parts 100, when at least one sensing part 100 is separated, a shape change in a first direction of the battery or the battery pack is detected by measuring an induced capacitance between the two disconnected sensing parts 100, and a shape change in a second direction of the battery or the battery pack is detected by measuring an induced capacitance between the sensing part 100 and an adjacent sensing part 100, wherein the first direction is substantially perpendicular to the second direction. The sensing part 100 is provided with a breakage facilitating position so that the sensing part 100 is divided into two parts at the breakage facilitating position when the shape change value of the battery or the battery pack is equal to or greater than the change threshold value.

In the case where the number of the sensing parts 100 is plural, in the case where one or more sensing parts 100 are separated, the adjacent sensing parts 100 of one or more sensing parts 100 are grounded, and the shape change of the battery or the battery pack is detected by detecting the capacitance generated between two sensing parts 100 of the one or more sensing parts 100.

In the capacitance measurement mode, capacitance is generated between the sensing parts which are disconnected into two parts, so that the deformation of the battery in a first direction (for example, the vertical direction in the figure) can be measured by measuring the sensing capacitance, the sensing capacitance changes correspondingly as the deformation is increased, and the deformation quantity of the battery can be obtained by measuring the changed sensing capacitance.

Furthermore, the deformation of the battery in the second direction, which may be, for example, the left-right direction, may also be measured by measuring the induced capacitance between adjacent inductive components. For example, the left-right direction deformation may be measured by measuring the capacitance between the first part of the sensing elements, which is indicated as 100 in fig. 7, and the left and/or right side sensing elements, or the corresponding deformation may be measured by measuring the capacitance between the part of the sensing elements located diagonally.

The sensing part 100 is disposed on a film, and the film is attached to the outer or inner surface of the battery, or the outer or inner surface of the battery pack. The film may be provided with a plurality of sensing parts, for example, and the sensing parts may be provided by sticking the film. The film may be flexible and the sensing component having some rigidity may be attached to the film. Wherein the inductive component may be made of a suitable material such as aluminum, copper, silver, various suitable metallic materials, conductive composites, conductive ceramics, and the like.

In one embodiment, in the case that the number of the sensing parts 100 is plural, the shielding parts 120 are disposed between the sensing parts 100 to prevent a capacitive effect from being formed between the adjacent sensing parts 100. In addition, in the case of the capacitance measurement mode, the adjacent inductive element may be grounded without providing the shield element.

According to a further mode of the present disclosure, for example, as shown in fig. 9, the battery detection apparatus further includes a driving unit, which provides a driving signal to the sensing part 100, so that the acquisition unit acquires an electrical signal generated by the sensing part 100 based on the driving signal.

The battery detection device further includes: the analog-to-digital conversion unit receives the electric signal from the acquisition unit and converts the electric signal into a digital signal; and the filtering unit is used for filtering the digital signal, the filtering unit comprises a low-pass filter and/or a nonlinear filter, and the filtered signal is transmitted to the processing unit.

The battery detection device further includes: a threshold updating unit that receives the shape change amount of the battery or the battery pack obtained by the processing unit and updates the threshold used in the battery detection process based on the shape change amount; and/or the parameter adjusting unit receives the shape variation of the battery or the battery pack obtained by the processing unit and adjusts parameters used in the battery detection process based on the shape variation so as to adjust at least one of the charging current parameter, the discharging current parameter, the temperature parameter, the electric quantity calculation parameter and the battery model parameter.

The electric quantity calculating unit may calculate the electric quantity according to the adjusted parameter, for example, the electric quantity may be calculated by changing a parameter such as a battery model. The battery protection unit may control various control amounts such as a charging current, a discharging current, a voltage, etc. according to the detected shape variation amount, thereby securing battery safety.

In addition, in the case of a plurality of sensing parts, a switching unit may be employed, and the switching unit may include a switching element, through which the plurality of sensing parts are selected for driving, collecting, and the like.

According to an embodiment of the present disclosure, there is also provided a battery management device, as shown in a dotted-line block of fig. 9, in which units other than the sensing part may be integrated into the battery management device.

According to an embodiment of the disclosure, a detection method of the battery detection device is also provided.

Fig. 10 shows a flow chart of a detection method S100 according to one embodiment of the present disclosure. As shown in fig. 10, an electric signal of the sensing part 100 is collected in step S102, and a shape change of the battery or the battery pack is detected based on a change of the electric signal of the sensing part 100 in step S104. In step S102, the change in the electrical signal is caused by the change in the resistance value of the sensing member 100, and when the shape of the battery or the battery pack changes, the resistance value of the sensing member 100 changes accordingly.

Fig. 11 provides a flow chart of a detection method S200 according to another embodiment of the present disclosure. As shown in fig. 11, an electric signal of the sensing part 100 is collected in step S202, and a shape change of the battery or the battery pack is detected based on a change of the electric signal of the sensing part 100 in step S204. In step S202, the change in the electrical signal is caused by the change in the resistance value of the sensing member 100, and when the shape of the battery or the battery pack changes, the resistance value of the sensing member 100 changes accordingly.

The detection method S200 further includes a step S206 of determining whether the sensing part 100 is separated, and if the sensing part 100 is separated, switching to a capacitance detection mode S208, in which a shape change of the battery or the battery pack is further detected by detecting an induced capacitance between the sensing devices separated into two parts in a step S210.

In addition, the method may further include a step S210, and in the step S210, in the case that the sensing component 100 is not divided into two parts, the sensing capacitance between adjacent sensing components may be periodically tested, so as to avoid the situation that the battery has been deformed but the sensing components are not disconnected. Thus, the induction capacitance of the induction component can be periodically detected, so that the condition can be prevented from happening. Accordingly, a period switching module may be included, which may perform the above-described operation and continue the detection by the resistance means if it is confirmed to be normal after the detection of the sensing capacitance is completed. And if the detection result is abnormal, alarming or switching to a capacitance detection mode.

In the capacitance detection mode, a shape change of the battery or the battery pack in a first direction is detected by detecting an induced capacitance between the two divided induction devices, and a shape change of the battery or the battery pack in a second direction is detected by detecting an induced capacitance between the adjacent induction devices, the first direction and the second direction being substantially perpendicular.

In the above two method embodiments, analog-to-digital conversion may be further included to perform analog-to-digital conversion on the acquired electrical signal of the sensing component 100, and the analog-to-digital converted digital signal is filtered, so as to obtain the shape change amount of the battery or the battery pack according to the filtered signal.

The threshold used in the battery detection process is updated according to the amount of shape change, and/or the parameters used in the battery detection process are adjusted according to the amount of shape change. For example, parameters of the battery model may be adjusted, etc. In addition, the charging and discharging current, the charging and discharging overvoltage and the like of the battery can be adjusted according to the adjusted parameters. When the safety threshold value occurs, an alarm signal or the like may be output to the outside.

In an embodiment of the present disclosure, the detected deformation signal is analog-to-digital converted by an analog-to-digital conversion unit. But there is usually a large disturbance 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.

Fig. 12 shows 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 jitter filtering unit 500.

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

The first integration unit 310 is configured to receive an analog input signal and perform modulation conversion on the analog input signal to generate a first integrated signal.

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

The quantization unit 230 is configured 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.

The low-pass filtering unit 300 may be configured to shape and filter out-of-band noise in the digital code stream output by the quantization unit 230.

The random jitter filtering unit 500 performs a filtering process on the shaped filtered signal of the low pass filtering unit 300 to remove random jitter data present in the shaped filtered signal and generate a digital output signal corresponding to the analog input signal.

The first integration unit 310 may take the form of a switched capacitor integrator, which according to a preferred example of the present disclosure provides a switched capacitor integrator as shown in fig. 13, wherein the advantages of high time constant accuracy, good temperature characteristics and easy clocking according to the novel switched capacitor integrator are achieved.

As shown in fig. 13, the first integration unit 310 may be composed of a switch, a capacitor, and an operational amplifier.

Wherein one end of the first switch S1-1 is connected to the first analog input signal terminal Vip, 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, 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, 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.

The other end of the first switch S11 is connected to the positive reference voltage terminal Vr + via a seventh switch S3-1 and to the negative reference voltage terminal Vr-via an eighth switch S4-1.

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

The connection node of the first sampling capacitor C1 and the second switch S6-1 is connected to the regulated voltage Vcmi via an eleventh switch, and the connection node of the second sampling capacitor C2 and the fourth switch S6-2 is connected to the regulated voltage Vcmi via a twelfth switch (the regulated voltage may be determined according to actual conditions).

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.

With the first integration unit 310, the integration capacitor in the first integration unit 310 samples the analog input signal through the on and off control of the switch in the first phase of the switch control signal, and the signal of the integration capacitor in the first integration unit 310 is transmitted to the integration capacitor through the on and off control of the switch in the second phase of the switch control signal, thus periodically operating.

Preferably, the first sampling capacitor and the second sampling capacitor are symmetrical and have equal capacitance values, and the first integrating capacitor and the second integrating capacitor are symmetrical and have equal capacitance values. With this structure, a smaller sampling capacitance can be adopted, and stability is better. This is because the structure shown in fig. 13 is not sensitive to parasitic elements, and therefore better adaptability to physical parasitic elements and non-ideal factors is achieved, and correspondingly smaller capacitance is used.

Fig. 14 shows a specific circuit diagram of the second integration unit 320 according to one embodiment of the present disclosure. Wherein the novel switched capacitor integrator has the advantages of high time constant accuracy, good temperature characteristics, and easy clock control.

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

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.

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

Fig. 15 shows a schematic diagram of an operational amplifier structure according to the present disclosure.

The structure of the operational amplifier is as follows:

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 the on and off of the first PMOS transistor M0, the drain of the first PMOS transistor M3526 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, 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, 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, and the gates of the first NMOS transistor M4 and the second NMOS transistor M3 are connected.

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.

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 connected to the negative input terminal and the positive input terminal of the second amplifier Ap respectively and to the sources of the sixth PMOS transistor M7 and the seventh PMOS transistor M8 respectively, and the gates of the sixth PMOS transistor M7 and the seventh PMOS transistor M8 are connected to the positive output terminal and the negative output terminal of the second amplifier Ap respectively and to the drains of the third NMOS transistor M5 and the fourth NMOS transistor M6 respectively.

A circuit diagram of a quantization unit according to the present disclosure is provided in fig. 16, in which a pre-amplification circuit and a latch may be included, wherein the pre-amplification circuit amplifies an input signal (an output signal of the second integration unit) to a predetermined degree (a predetermined gain), and the latch latches the amplified signal. And the output terminals Q and QB are output terminals of the quantizer in the circuit configuration shown in fig. 16.

The control of the switches in the first integration unit as shown in fig. 13 and the second integration unit as shown in fig. 14 may be controlled using a clock signal generated by a clock generation circuit as shown in fig. 17.

The clock generation circuit shown in fig. 17 can generate three two-phase non-overlapping clocks (clk1, clk 2; clk1 ', clk 2'; clk1 ', clk 2'), so that the timing of the analog-digital conversion device can be ensured to be correct. The switches shown in fig. 13 and 14 can be controlled, for example, by these overlapping signals. This allows the circuit to operate alternately under different control signals.

Further, 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 shows a circuit diagram of the chopper circuit.

Wherein the chopper circuit may be provided between the operational amplifier and the integrating capacitor as shown in fig. 13. The offset voltage of the operational amplifier can be eliminated by selecting or turning off the chopper circuit. By the chopper circuit, lower offset voltage can be realized. Specifically, the chopper circuit may modulate the offset voltage to a high frequency and then filter out. And the original signal still keeps the original state and is not influenced.

The chopper circuit is mainly composed of two switches and is controlled by a certain time sequence. In the first phase, INP is connected to OUTP and INN is connected to OUTN. And in the second phase, INP is connected to OUTN, and INN is connected to OUTP. This way, two modulations are achieved, the offset voltage being modulated to the location of the clock phase frequency. The original signal also undergoes modulation, but the second modulation modulates it back to the original position without being affected.

The low-pass filtering unit 300 is configured to shape and filter out-of-band noise in the digital code stream output by the quantization unit.

Fig. 19 presents a schematic diagram of a low-pass filtering unit 300 according to an embodiment of the present disclosure.

As shown in fig. 19, the low pass filtering unit 300 may include two cascaded stages of digital filters, a first stage digital filter 310 and a second stage digital filter 320. The digital filter employed may be a FIR low-pass digital filter.

Wherein the first stage digital filter 310 and the second stage digital filter 320 may have the same structure.

First stage digital filter 310 may include only first stage adder 311 and first stage register 312 and no multiplication unit is needed in first stage digital filter 310.

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. After receiving one output data of the quantizer 230 through the first stage digital filter 310, the one output data is added to the previous output data (obtained from the output of the first stage register 312) by the first stage adder 311, and the added data is transferred from the first stage adder 311 to the first stage register 312, stored 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 new data is added to the data stored in the register by the first-stage adder 311, the added data is output to the first-stage register 312, and the first-stage register 312 stores the new data, so that the periodic operation is performed, and the accumulation and storage processes are completed.

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. After receiving one output data of the first stage register 312 through the second stage digital filter 320, the one output data is added to the previous output data (obtained from the output of the second stage register 322) by the second stage adder 321, and the added data is transferred from the second stage adder 321 to the second stage register 322, stored by the second stage register 322, and then waits for the next input data. When a new data is received again from the first-stage register 312, the new data is added to the data stored in the register by the second-stage adder 321, the added data is output to the second-stage register 322, and the second-stage register 322 stores the new data, so that the periodic operation is performed, and the accumulation and storage processes are completed.

Further, the output of the second stage adder 321 may be taken as the output of the low pass filter unit 300.

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

In the digital filter of the low-pass filter, a multiplication unit is not needed, and the filter only consists of an adder and a register, so that the digital filter has the advantages of small hardware resource, high execution efficiency and small group delay.

It is also shown in fig. 19 that the low pass filtering 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 taken as the output of the low-pass filtering unit 300.

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. After receiving one output data of the second stage filter 320 through the third stage digital filter 330, the one output data is added to the previous output data (obtained from the output of the third stage register 332) through the third stage adder 331, and the added data is transferred from the third stage adder 331 to the third stage register 332, stored by the third stage register 332, and then waits for the next input data. When new data is received again from the second stage digital filter 320, the new data is added to the data stored in the register by the third stage adder 331, the added data is output to the third stage register 332, and the third stage register 332 stores the data, so that the periodic work is performed, thereby completing the process of accumulation and storage.

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. After receiving one output data of the third stage register 332 via the fourth stage digital filter 340, the one output data is added to the previous output data (obtained from the output of the fourth stage register 342) by the fourth stage adder 341, and the added data is transferred from the fourth stage adder 341 to the fourth stage register 342, stored 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 new data is added to the data stored in the register by the fourth-stage adder 341, the added data is output to the fourth-stage register 342, and the fourth-stage register 342 stores the data, so that the periodic operation is performed, and the accumulation and storage processes are completed.

The random jitter filtering unit 500 will be described below.

The random jitter filtering unit 500 may process the shaped filtered signal of the low pass filtering unit by a noise coefficient matrix, which may be expressed as n (a) ═ a₁、 a₂、……、a_i) Wherein i is an integer of 2 or more.

The noise coefficient matrix is determined by the system noise characteristics of the analog-to-digital conversion device and is changed according to the system noise characteristics.

The random jitter filtering unit may perform filtering processing on each bit of data in the N significant bits of the analog-to-digital conversion apparatus, where each bit of data is connected to one random jitter filtering unit.

The random jitter filtering unit can also perform filtering processing on m bits of data in N effective bits of the analog-to-digital conversion device at the same time, and the m bits of data are connected with one random jitter filtering unit. For example, N is 12 bits, and m is set to 3 bits, so that one random jitter filter unit can be connected to each 3 bits of the 12 bits, and thus 4 random jitter filter units can be connected.

The processing of one-bit (e.g., least significant bit, LSM) data is explained below. Wherein, the historical data of the bit data is n, wherein n is more than or equal to 2.

Acquiring n pieces of history data of least significant bits: d₁、D₂、……、D_n. And determining output data D by combining the n pieces of history data with the noise coefficient matrix_outFor example, this can be represented by the following formula:

(a₁×D₁+a₂×D₂+……+a_n×D_n)/G＝D_out。

wherein the data of the coefficient G can be selected to be suitable values according to the actual requirements of the analog-to-digital conversion device.

In this way, even if the data is disturbed by a certain amount, the data is still stable and unchanged from the external view.

Therefore, in the battery detection apparatus of the present disclosure, it is necessary to accurately detect the deformation of the battery so as to perform the relevant subsequent processing. In the disclosure, by adopting the analog-to-digital converter and the filtering unit, the induction capacitance electric signal can be well acquired with high precision, and the disturbance factor can be effectively removed.

According to a further embodiment of the present disclosure, there is also provided a battery management system as shown in fig. 20, including: the battery detection device of (1), the battery detection device is used for detecting the shape change of the battery or the battery pack.

In the description herein, reference to the description of the terms "one embodiment/mode," "some embodiments/modes," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/mode or example is included in at least one embodiment/mode or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to be the same embodiment/mode or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/aspects or examples and features of the various embodiments/aspects or examples described in this specification can be combined and combined by one skilled in the art without conflicting therewith.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

It will be understood by those skilled in the art that the foregoing embodiments are merely for clarity of illustration of the disclosure and are not intended to limit the scope of the disclosure. Other variations or modifications may occur to those skilled in the art, based on the foregoing disclosure, and are still within the scope of the present disclosure.

Claims

1. A battery test apparatus, comprising:

2. The battery test apparatus of claim 1, wherein the sensing member comprises one or more sensing members disposed along an outer or inner surface of the battery, or an outer or inner surface of a battery pack.

3. The battery detection apparatus according to claim 2, wherein when the shape of the sensing member changes, the resistance value of the sensing member changes accordingly, and the change electric signal is obtained from the changed resistance value.

4. The battery detection device according to claim 2, wherein the sensing part is detachable when the shape change value of the battery or the battery pack is equal to or greater than a change threshold value, and the sensing part is in a connected state when the shape change value of the battery or the battery pack is less than the change threshold value,

5. The battery test device according to claim 4, wherein each sensing part is integrally formed and forms a continuous state, or,

6. The battery test apparatus of claim 4, wherein the shape change of the battery or the battery pack in the first direction is detected by collecting an induced capacitance between the two sensing parts when the sensing parts are separated into two parts.

7. The battery detection apparatus as claimed in claim 6, wherein in the case where the sensing part is a plurality of sensing parts, when at least one sensing part is separated, the shape change of the battery or the battery pack in a first direction is detected by measuring the sensing capacitance between the two sensing parts that are separated, and the shape change of the battery or the battery pack in a second direction is detected by measuring the sensing capacitance between the sensing part and the adjacent sensing part, wherein the first direction is substantially perpendicular to the second direction.

8. The battery detection apparatus according to claim 6, wherein the sensing member is provided with a breakable position so that the sensing member is divided into two parts at the breakable position when the shape change value of the battery or the battery pack is equal to or greater than a change threshold value.

9. The battery test device according to any one of claims 1 to 8, wherein the sensing part 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.

10. The battery detection apparatus according to any one of claims 4 to 8, wherein in a case where the number of the sensing parts is plural, a shielding part is provided between the sensing parts to prevent a capacitive effect from being formed between adjacent sensing parts.

11. The battery detection apparatus according to any one of claims 4 to 8, wherein in the case where the number of the sensing parts is plural, in the case where one or more sensing parts are separated, adjacent sensing parts of the one or more sensing parts are grounded, and the shape change of the battery or the battery pack is detected by detecting a capacitance generated between two sensing parts of the one or more sensing parts.

12. The battery test device according to any one of claims 1 to 8, further comprising a driving unit, wherein the driving unit 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.

13. The battery test apparatus of any of claims 1 to 8, further comprising:

14. The battery test apparatus of claim 13, further comprising:

a threshold updating unit that receives the shape change amount of the battery or battery pack obtained by the processing unit and updates a threshold used in a battery detection process based on the shape change amount; and

15. The battery test apparatus of claim 14, further comprising:

16. A battery management system, comprising: the battery detection apparatus according to any one of claims 1 to 15, which is used to detect a change in shape of the battery or battery pack.