CN112736306A

CN112736306A - Battery management chip and battery management system

Info

Publication number: CN112736306A
Application number: CN202110000360.1A
Authority: CN
Inventors: 周号
Original assignee: Zhuhai Maiju Microelectronics Co Ltd
Current assignee: Zhuhai Maiju Microelectronics Co Ltd
Priority date: 2021-01-03
Filing date: 2021-01-03
Publication date: 2021-04-30
Anticipated expiration: 2041-01-03
Also published as: CN112736306B

Abstract

The present disclosure provides a battery management chip, which is used for detecting the safety of a battery, comprising: a sampling unit, which is used to collect signals to the battery; and a data processing unit, which is used for The signal collected by the sampling unit is processed to sense the safety of the battery. The present disclosure also provides a battery management system.

Description

Battery management chip and battery management system

Technical Field

The present disclosure relates to a battery management chip and a battery management system.

Background

Lithium batteries are widely used in various fields of industry and life, but there are some problems in using the lithium batteries, for example, moisture may be formed in a lithium battery pack according to different application environments of the batteries, and if the moisture is too much, the moisture may damage the lithium batteries, for example, the lithium batteries may be short-circuited, and the like. In addition, the lithium battery can deform when being subjected to external force, and bulges can be generated after the battery is aged. When the above problems occur in the lithium battery, problems such as internal short circuit, fire explosion, etc. will occur. Safety inspection of lithium batteries is therefore essential.

Generally, moisture in the lithium battery is detected by using a humidity sensor and the like, and deformation detection is generally performed by using a pressure sensor and the like. However, in the case of using these sensors, the cost is too high, and for the deformation detection, the position, the range, the area, the type, and the like of the deformation cannot be accurately determined by using the pressure sensor.

The present disclosure provides a more efficient battery management chip that can be used to detect each battery in a battery pack, and make a determination based on a detection signal, and the like.

Disclosure of Invention

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

According to an aspect of the present disclosure, a battery management chip for detecting a change in shape of a battery and/or a change in moisture content around the battery, includes:

the sampling unit is used for acquiring a sensing capacitance signal output by a capacitance sensing device for measuring the shape change of the battery and/or the water content change around the battery, wherein the sensing capacitance signal changes when the shape of the battery changes or the water content change around the battery changes; and

and the data processing unit is used for processing the induction capacitance signals collected by the sampling unit so as to obtain the shape change of the battery and/or the water content change around the battery through the induction capacitance signals.

According to at least one embodiment of the present disclosure, the data processing unit includes:

the analog-to-digital conversion unit is used for converting the analog signals collected by the sampling unit into digital signals; and

a filtering unit that filters the digital signal.

According to at least one embodiment of the present disclosure, the filtering unit includes a linear filter, a nonlinear filter, or a combination filter of a linear filter and a nonlinear filter.

According to at least one embodiment of the present disclosure, the data processing unit further includes:

the calculation unit is used for calculating the filtered digital signal so as to obtain a change value and/or a change rate of the induction capacitor; and

a determination unit that determines a change in shape of the battery and/or a change in water content around the battery based on the change value and/or the change rate of the induction capacitance.

According to at least one embodiment of the present disclosure, the determining unit may determine a deformation position, a deformation amount, a deformation range, and/or a deformation type of the battery according to the change value and/or the change rate of the induced capacitance.

According to at least one embodiment of the present disclosure, the battery management chip further comprises an applying unit for applying a stimulus to the capacitive sensing device.

According to at least one embodiment of the present disclosure, the battery management chip further includes a multiplexing unit, and the multiplexing unit is configured to select and receive the sensing capacitance signal output by the capacitance sensing device, and provide the sensing capacitance signal to the sampling unit.

According to at least one embodiment of the present disclosure, the battery management chip is configured to detect a shape change of a battery in a battery pack and/or a water content change inside the battery pack, the battery pack includes two or more battery units arranged at a predetermined interval, the capacitance sensing device includes a first plate and a second plate, the first plate is disposed near an outer surface, a near inner surface, or a near inner surface of one battery unit of adjacent battery units, and the second plate is disposed near an outer surface, a near inner surface, or a near inner surface of another battery unit of the adjacent battery units, wherein the first plate and the second plate are disposed opposite to each other.

According to at least one embodiment of the present disclosure, a first electrode plate and a second electrode plate are disposed between each two adjacent batteries of two or more battery units.

According to at least one embodiment of the present disclosure, the first electrode plate and/or the second electrode plate is an electric conductor for battery packaging.

According to at least one embodiment of the present disclosure, the first plate and/or the second plate is an electrical conductor or an electrically conductive material disposed at, near, at, or near an outer surface of the battery, respectively.

According to at least one embodiment of the present disclosure, the first plate and the second plate are disposed in parallel.

According to at least one embodiment of the present disclosure, the first electrode plate includes more than one first electrode plate unit, the second electrode plate includes more than one second electrode plate unit, the first electrode plate unit and the second electrode plate unit are correspondingly arranged one to one and form a capacitance sensing unit, and the sampling unit collects the sensing capacitance generated by each capacitance sensing unit.

According to at least one embodiment of the present disclosure, the first plate includes more than one first plate unit, the second plate includes more than two second plate units, one first plate unit is at least corresponding to more than two second plate units to form a capacitance sensing unit, and the sampling unit collects the sensing capacitance generated by each capacitance sensing unit.

According to at least one embodiment of the present disclosure, the first and second plate units have at least one of a circular shape, an oval shape, and a polygonal shape, and the first and second plate units disposed in one-to-one correspondence are disposed on the first and second plates, respectively.

According to at least one embodiment of the present disclosure, the first and second plate units are bar-shaped, and an extending direction of the first plate unit on the first plate is at a predetermined angle to an extending direction of the second plate unit on the second plate.

According to at least one embodiment of the present disclosure, the first plate unit and the second plate unit are respectively a driving unit and a receiving unit or a receiving unit and a driving unit, and the sampling unit collects an induced capacitance generated between each receiving unit and the corresponding driving unit and between each receiving unit and the adjacent driving unit.

According to at least one embodiment of the present disclosure, the first plate unit and the second plate unit are respectively a driving unit and a receiving unit or a receiving unit and a driving unit, and the sampling unit collects an induced capacitance generated between each receiving unit and each driving unit.

According to at least one embodiment of the present disclosure, the first plate unit and the second plate unit are respectively a driving unit and a receiving unit or a receiving unit and a driving unit, and the sampling unit collects an induced capacitance generated between each receiving unit and the corresponding driving unit.

According to at least one embodiment of the present disclosure, the battery management chip is configured to detect a shape change of a battery in a battery pack and/or a water content change inside the battery pack, the battery pack includes two or more battery units arranged at a predetermined interval, the capacitance sensing device includes a first plate disposed near an outer surface, near an inner surface, or near an inner surface of one battery unit of adjacent battery units, and the first plate includes two or more driving plate units and two or more receiving plate units, the driving plate units and the plate units are arranged in a staggered manner.

According to at least one embodiment of the present disclosure, a first electrode plate is disposed between each two adjacent batteries of the two or more battery units, or a first electrode plate is disposed on each battery unit.

According to at least one embodiment of the present disclosure, the first electrode plate is an electrical conductor for battery packaging.

According to at least one embodiment of the present disclosure, the first plate is an electrical conductor or conductive material disposed at, near, or near an outer surface of the battery, respectively.

According to at least one embodiment of the present disclosure, the sampling unit collects an induced capacitance generated between each receiving plate unit and an adjacent transmitting plate unit.

According to at least one embodiment of the present disclosure, the battery management chip is configured to detect a shape change of a battery in a battery pack and/or a water content change inside the battery pack, the battery pack includes two or more battery units arranged at a predetermined interval, the capacitance sensing device includes a first plate disposed near an outer surface, a near inner surface, or a near inner surface of one battery unit of adjacent battery units, a second plate disposed near an outer surface, a near inner surface, or a near inner surface of another battery unit of the adjacent battery units, and an intermediate plate disposed between the first plate and the second plate.

According to at least one embodiment of the present disclosure, a first electrode plate, a second electrode plate, and an intermediate electrode plate are disposed between each two adjacent batteries of two or more battery units.

According to at least one embodiment of the present disclosure, the first plate and the middle plate form a first capacitance sensing structure for measuring the one battery cell, the second plate and the middle plate form a second capacitance sensing structure for measuring the other battery cell.

According to at least one embodiment of the present disclosure, the first plate and/or the second plate is an electrical conductor or an electrically conductive material disposed at, near, at, or near an outer surface of the battery, respectively, and the intermediate plate is an electrical conductor.

According to at least one embodiment of the present disclosure, the first plate, the second plate, and the middle plate are arranged in parallel.

According to at least one embodiment of the present disclosure, the first electrode plate includes more than one first electrode plate unit, the middle electrode plate includes more than one middle electrode plate unit, the first electrode plate unit and the middle electrode plate unit are arranged in a one-to-one correspondence manner and constitute a capacitance sensing unit, and the sampling unit collects the sensing capacitance generated by each capacitance sensing unit.

According to at least one embodiment of the present disclosure, the second plate includes more than one second plate unit, the middle plate includes more than one middle plate unit, the second plate unit and the middle plate unit are correspondingly arranged one to one and constitute a capacitance sensing unit, and the sampling unit collects the sensing capacitance generated by each capacitance sensing unit.

According to at least one embodiment of the present disclosure, the first plate includes more than one first plate unit, the middle plate includes more than two middle plate units, one first plate unit at least corresponds to more than two middle plate units to be set up so as to form a capacitance sensing unit, and the sampling unit collects the sensing capacitance generated by each capacitance sensing unit.

According to at least one embodiment of the present disclosure, the second plate includes more than one second plate unit, the middle plate includes more than two middle plate units, one second plate unit is at least arranged corresponding to more than two middle plate units to form a capacitance sensing unit, and the sampling unit collects the sensing capacitance generated by each capacitance sensing unit.

According to at least one embodiment of the present disclosure, the first plate unit, the second plate unit and the middle plate unit are at least one of circular, oval and polygonal in shape, and the first plate unit and the second plate unit, which are disposed in one-to-one correspondence, are disposed on the first plate and the second plate, respectively.

According to at least one embodiment of the present disclosure, the first plate unit and the middle plate unit are bar-shaped, and an extending direction of the first plate unit on the first plate and an extending direction of the middle plate unit on the middle plate form a predetermined angle.

According to at least one embodiment of the present disclosure, the second and middle plate units are bar-shaped, and an extending direction of the second plate unit on the second plate is at a predetermined angle to an extending direction of the middle plate unit on the middle plate.

According to at least one embodiment of the present disclosure, the first electrode plate and the second electrode plate are driving electrode plates or receiving electrode plates, the middle electrode plate is a receiving electrode plate or a driving electrode plate, and the sampling unit collects an induced capacitance generated between each receiving electrode plate and each driving electrode plate.

According to at least one embodiment of the present disclosure, a first middle plate unit corresponding to the first plate unit and a second middle plate unit corresponding to the second plate unit are respectively disposed on both sides of the middle plate.

According to another aspect of the present disclosure, a battery management system includes the battery management chip as described above, by which a change in shape of a battery and/or a change in moisture content around the battery is measured.

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 management chip according to one embodiment of the present disclosure.

Fig. 2 shows a schematic diagram of a battery safety detection module according to one embodiment of the present disclosure.

Fig. 3 shows a schematic diagram of a capacitive sensing device according to an embodiment of the present disclosure.

Fig. 4 shows a schematic diagram of a capacitive sensing device according to an embodiment of the present disclosure.

Fig. 5 shows a schematic diagram of a capacitive sensing device according to an embodiment of the present disclosure.

Fig. 6 shows a schematic diagram of a capacitive sensing device according to an embodiment of the present disclosure.

Fig. 7 shows a schematic diagram of a capacitive sensing device according to an embodiment of the present disclosure.

Fig. 8 shows a schematic diagram of a capacitive sensing device according to an embodiment of the present disclosure.

Fig. 9 shows a schematic diagram of a capacitive sensing device according to an embodiment of the present disclosure.

Fig. 10 shows a schematic diagram of a capacitive sensing device according to an embodiment of the present disclosure.

Fig. 11 shows a schematic diagram of a capacitive sensing device according to an 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 the inherent variation of a processed value, a calculated value, and/or a provided value that would be recognized by one of ordinary skill in the art.

According to one embodiment of the present disclosure, a battery management chip is provided. The battery management chip can measure moisture or water content contained in the battery pack and can also measure deformation of the battery unit in the battery pack.

According to the technical scheme of the disclosure, the change of water content in/around the battery pack or the deformation of the battery can be measured by arranging one capacitor plate in or near the battery pack.

Fig. 1 illustrates a battery management system according to one embodiment of the present disclosure. Wherein the dashed lines show the battery management chip 100.

As shown in fig. 1, the battery management chip 100 may be used to manage a battery. The battery can be a lithium battery pack comprising a plurality of lithium batteries connected in series.

The battery management chip 100 may include a gating detection module, a voltage amplification module, an analog-to-digital conversion module, a control logic module, a switch driving module, a battery safety detection module, a discharge switch MD, and a charge switch MC.

The gating detection module gates the voltage of each battery and detects each battery B₁～B_nThe voltage of (c). Wherein the gating detection module may be configured to detect the filtered battery voltage, which may be filtered by a filter resistor R_f1～R_fnAnd a filter capacitor C₁～C_nAnd the formed RC filter.

The voltage amplification module may amplify the voltage of each battery from the strobe detection module.

The analog-to-digital conversion module is used for performing analog-to-digital conversion on the voltage of each battery from the voltage amplification module and providing the converted digital signals to the control logic module.

The control logic module can provide a control signal to the switch driving module at least according to the detected battery voltage so as to control the discharging switch MD and the charging switch MC through the switch driving module, thereby realizing the charging and discharging control of the battery.

In addition, the battery management chip may further include a voltage converter. The voltage converter is used to convert a maximum battery voltage VCC, such as a battery, to various required supply voltages VDD, which may be, for example, 5V or the like.

As shown in fig. 1, the battery management chip 100 may pass a PIN₁Pin to obtain the first battery B₁Positive terminal voltage of, by PIN₂Pin to obtain the first battery B₂… …, through the PIN_n-1Pin to obtain the first battery B_n-1Positive terminal voltage of, by PIN_nPin to obtain the first battery B_nIs turning toA terminal voltage.

Fig. 2 shows a schematic diagram of a battery safety detection module in a battery pack according to a first aspect of the present disclosure.

As shown in fig. 2, the battery safety detection module is used to detect a change in the shape of the battery and/or a change in the moisture content around the battery. The battery safety detection module includes: the sampling unit is used for acquiring a sensing capacitance signal output by a capacitance sensing device for measuring the shape change of the battery and/or the water content change around the battery, wherein the sensing capacitance signal changes when the shape of the battery changes or the water content change around the battery; and the data processing unit is used for processing the induction capacitance signals collected by the sampling unit so as to obtain the shape change of the battery and/or the water content change around the battery through the induction capacitance signals.

The data processing unit includes: the analog-to-digital conversion unit is used for converting the analog signals collected by the sampling unit into digital signals; and a filtering unit that filters the digital signal. The filtering unit includes a linear filter, a nonlinear filter, or a combination filter of a linear filter and a nonlinear filter.

The data processing unit further includes: the calculation unit is used for calculating the filtered digital signal so as to obtain a change value and/or a change rate of the induction capacitor; and a determination unit that determines a change in shape of the battery and/or a change in water content around the battery based on the change value and/or the change rate of the sensing capacitance. The judging unit can judge the deformation position, the deformation amount, the deformation range and/or the deformation type of the battery according to the change value and/or the change rate of the induction capacitor.

The battery management chip further comprises an application unit for applying a stimulus to the capacitive sensing means.

The battery management chip also comprises a multiplexing unit, and the multiplexing unit is used for selectively receiving the sensing capacitance signal output by the capacitance sensing device and providing the sensing capacitance signal to the sampling unit.

Fig. 3 illustrates a battery safety detection module in a battery pack according to a first aspect of the present disclosure.

As shown in fig. 3, the battery pack may include more than two battery cells. Fig. 3 shows three

battery cells

621, 622, and 623, it being noted that other numbers of battery cells are possible. In the following, three battery cells are taken as an example, and the principle is the same when other number of battery cells are used.

The three

battery cells

621, 622, and 623 are arranged at a predetermined space interval.

The battery safety detection module may include a capacitance sensing device and a processing device.

The capacitance sensing device may include a first plate 601 disposed on, near, or inside an outer surface of one of the neighboring battery cells and a second plate 602 disposed on, near, or inside an outer surface of the other of the neighboring battery cells, wherein the first plate and the second plate are disposed in a predetermined space and are oppositely disposed. A first polar plate and a second polar plate are arranged between every two adjacent batteries of more than two battery units.

As shown in fig. 6, a first plate may be disposed on the outer surface of the first cell 621 and correspondingly a second plate on the outer surface of the second cell 622, a first plate on the outer surface of the other side of the second cell, and a second plate on the outer surface of the third cell 623.

The data processing unit processes the output signals of the first plate and/or the second plate so as to acquire a capacitance change between the first plate and the second plate caused by moisture around the battery unit and/or deformation of the battery unit.

In addition, the data processing unit processes the output signals of the first polar plate and/or the second polar plate, and can acquire the capacitance change between the first polar plate and the second polar plate generated when the deformation of the battery unit causes the distance change between the first polar plate and the second polar plate. When the battery unit deforms, the pole plates deform correspondingly, so that the distance between the pole plates changes, and correspondingly, the capacitance generated between the pole plates also changes. The shape of the plates is not regular due to variations in shape. Therefore, if there are a plurality of pairs of plates for detection as described below, the rate of change or value of change in capacitance formed by each pair of plates will be different.

Fig. 4 shows a schematic view of moisture contained in the battery pack. Fig. 5 shows a schematic diagram of a battery after deformation, wherein the deformation shown in fig. 5 is a bulge-type deformation of the battery cell.

In the battery pack of the present disclosure, the resulting capacitance value between the first and second pole plates will change due to changes in the moisture content of the battery pack. The deformation of the battery unit causes the first and second electrode plates to deform. When the first polar plate and the second polar plate are deformed, the electrostatic capacitance value between the first polar plate and the second polar plate is changed. Thus, the change in the moisture content in the battery pack and/or the deformation of the battery cell can be obtained by measuring the change in the capacitance value.

According to further embodiments of the present disclosure, the number of the first electrode plate and the second electrode plate disposed at the outer surface of one battery may be two or more. The data processing unit respectively acquires unit capacitance change values formed by the two or more capacitance sensing units.

Fig. 6 shows a case where a plurality of first and second pole plates are provided. The number of the first polar plate and the second polar plate may be set according to actual situations, and the shape of the first polar plate and the second polar plate may be various shapes such as a square, a rectangle, a circle, a trapezoid, a diamond, a triangle, a T-shape, an interdigital shape, a polygon, and the like.

By providing a plurality of first electrode plates and a plurality of second electrode plates, taking a first battery cell and a second battery cell as an example, a plurality of first electrode plates are provided on the outer surface of the first battery cell, and correspondingly, a plurality of second electrode plates are provided on the outer surface of the second battery cell. When the size and shape of each pair of the first and second plates are the same, the change in capacitance value detected by each pair of the first and second plates is the same when the moisture content in the battery pack is changed (because the change in dielectric constant caused by the moisture content in the battery pack is uniform), but when the size and/or shape of each pair of the first and second plates is the same, the change in capacitance value detected by each pair of the first and second plates is different when the moisture content in the battery pack is changed, the change in capacitance value caused by the moisture content can be obtained by calculating the rate of change in capacitance value of each pair of the first and second plates, for example, the rate of change in capacitance value between the previous and subsequent times.

When the first battery unit and/or the second battery unit at the position of a certain first polar plate and a certain second polar plate deform, the static capacitance value generated by the first polar plate and the second polar plate will change, and therefore the deformation condition of the first battery unit and/or the second battery unit is obtained by detecting the static capacitance value. Because different first and second plates are disposed at different locations, the static capacitance values generated by the respective first and second plates may be different. For example, when a bulge-type fault occurs, the static capacitance change of the first plate and the second plate at the bulge position is large, and the static capacitance change of the first plate and the second plate at the non-bulge position is small. Thus, the position and the range of deformation, and the type and the deformation amount of the deformation can be obtained according to the arrangement positions of the first polar plate and the second polar plate.

Preferably, the first plate and the second plate are arranged in parallel.

For example, the data processing unit of the present disclosure may further include a comparison unit for comparing the capacitance change value and/or the change rate of each cell (each corresponding cell made up of the first plate and the second plate), and determining a change in the water content in the battery pack according to the comparison result. The comparison unit can also judge the deformation position, the deformation amount, the deformation range and/or the deformation type of the battery according to the capacitance change value and/or the change rate.

In addition, whether the capacitance change is caused by the change of the water content or the deformation of the battery unit can be judged according to the capacitance change value and/or the change rate. For example, when a bulge-type failure having a shape as shown in fig. 8 occurs, the change value and/or the change rate of the electrostatic capacitance of the middle two first electrode plates and the second electrode plates will be significantly different from the change value and/or the change rate of the electrostatic capacitance of the two first electrode plates and the second electrode plates on both sides, so that by detecting the change value and/or the change rate of the electrostatic capacitance of the detection unit formed by each of the first electrode plates and the second electrode plates, the position where the deformation occurs can be obtained, and the type of the deformation can also be obtained by the position of the deformation. For example, when a change in moisture content occurs, the value and/or rate of change of the electrostatic capacitance of each cell is substantially uniform/equal, and thus it can be considered that the capacitance change is caused by the change in moisture content.

In one embodiment of the present disclosure, an electrical conductor for external packaging of each battery cell may be employed as the first and second plates. For example, the battery cell is usually wrapped with aluminum foil, and aluminum foil for wrapping may be used as the first and second electrode plates. And an insulating layer or the like may be further provided between the aluminum foil and the battery body.

According to another embodiment of the present disclosure, the first plate and/or the second plate is an electrical conductor or conductive material disposed at or near an outer surface of one battery cell and/or at or near an outer surface of another battery cell, respectively, and may also be disposed at or near an inner surface. For example, the first electrode plate and the second electrode plate may be formed separately from an electrically conductive material, or the first electrode plate and the second electrode plate may be formed of an electrically conductive material (e.g., coated with an electrically conductive material) to function as the first electrode plate and the second electrode plate.

The battery safety detection module may further include an applying device for applying a stimulus to the first plate and/or the second plate. In addition, a threshold comparison unit may be included, and when the capacitance change value and/or the change rate exceeds a predetermined threshold, it is determined that the battery has a fault (excessive moisture content, excessive deformation, etc.).

Fig. 7 shows a case where a plurality of first plates 6011 and second plates 6021 are arranged in a stripe shape and cross, where the first plates may serve as emitting plates and the second plates may serve as receiving plates, or vice versa. After the first plates are sequentially excited, the induced capacitance obtained from each excited first plate is measured by each second plate, respectively.

Fig. 8 shows the case of a plurality of first plates 6011 and second plates 6021, the plates being rectangular and arranged correspondingly, where the first plate may act as an emitter plate and the second plate may act as a receiver plate, or vice versa. After the first plates are sequentially excited, the induced capacitance obtained according to each excited first plate is measured by the adjacent second plates, respectively.

Fig. 9 shows a case where one second plate 602 is included, and there are a plurality of first plates 6011, where the first plate may be used as a transmitting plate, the second plate may be used as a receiving plate, and vice versa. After each first plate is excited in turn, the induced capacitance obtained from the excited first plate is measured by the second plate, respectively, and vice versa.

According to another aspect of the present disclosure, there is also provided a battery management system including the above battery safety detection module, by which the moisture content and/or deformation of the battery cells in the battery pack is measured.

According to a second aspect of the present disclosure, there is provided a battery safety detection module in a battery pack, the battery pack including two or more battery cells arranged at a predetermined space, the battery safety detection module including: the capacitance sensing device comprises a first polar plate array and a second polar plate array; and a data processing unit processing output signals of the first plate array and/or the second plate array so as to acquire a change in capacitance between the first plate array and the second plate array generated when a moisture content in the battery pack changes, wherein the first plate array includes two or more first plates and the second plate array includes two or more second plates, an extending direction of the two or more first plates is at a predetermined angle to an extending direction of the two or more second plates, the first plate array is disposed on, near, or inside an outer surface of one of adjacent battery cells, the second plate array is disposed on, near, or inside an outer surface of another of the adjacent battery cells, and wherein the first plate array and the second plate array are disposed in a predetermined space and are oppositely disposed. The predetermined angle may be 90 degrees.

A first polar plate array and a second polar plate array are arranged between every two adjacent batteries of more than two battery units. The first and second electrode plate arrays may be arranged in parallel.

Two battery cells will be described as an example. Fig. 10 shows a schematic arrangement of the first and second plates of the first and second battery cells.

As shown in fig. 7, the first electrode plate 6011 disposed in the first electrode plate array of the first battery cell may extend in the first direction and may be arranged in plurality in parallel, and the second electrode plate 6021 disposed in the second electrode plate array of the second battery cell may extend in the second direction and may also be arranged in plurality in parallel. In this way, when the first polar plate and the second polar plate are arranged oppositely, the change of the water content of the battery pack and/or the deformation of the battery unit can be sensed through the capacitance value generated between the first polar plate and the second polar plate. It should be noted that although the first plate and the second plate are provided in the shape of long bars in fig. 7, they may also take other shapes, and are not limited in this disclosure.

The battery safety detection module may further include an applying device for applying a stimulus to one or more of the two or more first electrode plates in a time-sharing manner and/or applying a stimulus to one or more of the two or more second electrode plates in a time-sharing manner.

For example, an excitation voltage is applied to a first plate at a first time, and then the electrostatic capacitance between the first plate and a second plate is measured. An excitation voltage is then applied to the other first plate, and the electrostatic capacitance between the first and second plates is measured, … ….

Thus, the electrostatic capacitance value between the first plate and the second plate obtained after the excitation voltage is applied to each first plate can be finally obtained.

The data processing unit obtains the capacitance change measured based on each first polar plate and/or second polar plate after applying excitation to the first polar plate and/or second polar plate at one time and other times, compares the capacitance change value and/or change rate, and judges the water content change of the battery and/or the deformation position, deformation amount, deformation range and/or deformation type of the battery unit according to the comparison result.

For example, when the moisture content in the battery pack changes, the change value and/or the change rate of the electrostatic capacitance measured by each plate is substantially uniform/equal, and thus the change can be regarded as being caused by the change in the moisture content. When a bulge-type fault with the shape shown in fig. 5 occurs, the change value and/or the change rate of the electrostatic capacitance of the first polar plate and the second polar plate at the bulge position is larger than the change value and/or the change rate of the electrostatic capacitance of the two first polar plates and the two second polar plates at the two sides, so that the position where deformation occurs can be obtained by detecting the change value and/or the change rate of the electrostatic capacitance of the detection unit formed by each first polar plate and each second polar plate, and the type of deformation and the like can also be obtained by the position of deformation.

In one embodiment of the present disclosure, an electrical conductor for external packaging of each battery cell may be employed as the first and second plates. For example, the battery cell is usually wrapped with aluminum foil, and aluminum foil for wrapping may be used as the first and second electrode plates. And an insulating layer or the like may be further provided between the aluminum foil and the battery body. The packaging aluminium foil may then be treated to form each of the first and second plates.

According to another embodiment of the present disclosure, the first plate and/or the second plate is an electrical conductor or conductive material disposed at or near an outer surface of one battery cell and/or at or near an outer surface of another battery cell, respectively, and may be disposed at or near an inner surface. For example, the first electrode plate and the second electrode plate may be formed separately from an electrically conductive material, or the first electrode plate and the second electrode plate may be formed of an electrically conductive material (e.g., coated with an electrically conductive material) to function as the first electrode plate and the second electrode plate.

In addition, when the capacitance change exceeds a preset threshold value, the problem that the water content of the battery is too much or the deformation of the battery is too large is judged. For example, as can be seen from the above, the capacitance sensing device according to the present disclosure can effectively distinguish the change of the moisture content from the change of the shape, so that it can be obtained whether the problem of the moisture content or the deformation of the battery occurs after the distinguishing.

According to a further embodiment of the present disclosure, there is also provided a battery management system including the battery safety detection module as above, wherein the moisture content and/or deformation of the battery cells in the battery pack are measured by the battery safety detection module.

According to a third aspect of the present disclosure, there is provided a battery safety detection module in a battery pack, the battery pack including two or more battery cells arranged at a predetermined space, the battery safety detection module including: the capacitance induction device comprises a first polar plate, a second polar plate and a middle polar plate; and a data processing unit which processes output signals of the first plate, the second plate and/or the middle plate so as to obtain capacitance changes between the first plate and the middle plate and/or between the second plate and the middle plate generated when the change of the water content in the battery pack and/or the deformation of the battery units cause the change of the distance between the first plate and the middle plate and/or between the second plate and the middle plate, wherein the first plate is arranged on, near or in the outer surface of one battery unit of the adjacent battery units, the second plate is arranged on, near or in the outer surface of the other battery unit of the adjacent battery units, the middle plate is arranged between the first plate and the second plate, and the middle plate is respectively arranged opposite to the first plate and the second plate in a preset space.

A first polar plate 601, a second polar plate 602 and an intermediate polar plate 603 are arranged between each two adjacent batteries of the more than two battery units.

As shown in fig. 10, an intermediate plate is disposed between the first plate and the second plate, the change of the water content inside the battery pack and/or the deformation of the first battery unit can be known through the capacitance change between the intermediate plate and the first plate, and the change of the water content inside the battery pack and/or the deformation of the second battery unit can be known through the capacitance change between the intermediate plate and the second plate. The principle is the same for other battery units, and the description is omitted.

According to another embodiment of the present disclosure, the first plate and/or the second plate is an electrical conductor or conductive material disposed at or near an outer surface of one battery cell and/or at or near an outer surface of another battery cell, respectively, and may additionally be disposed at or near an inner surface. For example, the first electrode plate and the second electrode plate may be formed separately from an electric conductor, or the first electrode plate and the second electrode plate may be formed from an electrically conductive material.

The middle pole plate can be a whole conductor, and the conductor/conductive material can also be arranged on two sides of the middle pole plate. When the whole conductor is adopted, the change of the water content in the battery pack and/or the deformation of the first battery unit and the deformation of the second battery unit can be obtained by respectively detecting the capacitance change between the middle polar plate and the first polar plate and the capacitance change between the middle polar plate and the second polar plate. When the conductors/conductive materials are disposed on both sides of the middle plate, the change in the water content inside the battery pack and/or the deformation of the first battery cell is measured by the conductors/conductive materials on the opposite side of the middle plate corresponding to the first plate, and the change in the water content inside the battery pack and/or the deformation of the second battery cell is measured by the conductors/conductive materials on the opposite side of the middle plate corresponding to the second plate. Under the condition that the electric conductors or the electric conducting materials are respectively arranged on the two sides of the middle polar plate, the electric conductors or the electric conducting materials on the two sides are insulated.

Similar to the above embodiments, the number of the first electrode plates, the number of the second electrode plates, and the number of the middle electrode plates are respectively two or more, the two or more first electrode plates and the two or more middle electrode plates are arranged in a one-to-one correspondence manner and form two or more first capacitance sensing units, the two or more second electrode plates and the two or more middle electrode plates are arranged in a one-to-one correspondence manner and form two or more second capacitance sensing units, and the data processing unit respectively obtains the unit capacitance change values and/or the change rates formed by the two or more first capacitance sensing units and the two or more second capacitance sensing units.

The data processing unit comprises a comparison unit, and the comparison unit is used for comparing the capacitance change value and/or the change rate of each unit and judging the change of the water content in the battery pack and/or the deformation position, the deformation amount, the deformation range and/or the deformation type of the battery according to the comparison result.

Similarly, the first plate and/or the second plate is/are an electrical conductor for packaging one battery cell and/or an electrical conductor for packaging another battery cell, and the intermediate plate is an electrical conductor or a conductive material disposed between the first plate and the second plate. Alternatively, the first and/or second plates are conductors or conductive materials disposed adjacent to an outer surface of one cell and/or adjacent to an outer surface of another cell, respectively, and the intermediate plate is a conductor or conductive material disposed between the first and second plates.

The first polar plate, the second polar plate and the middle polar plate are arranged in parallel.

And the application device is used for applying excitation to the first polar plate, the second polar plate and/or the middle polar plate. And when the capacitance change exceeds a preset threshold value, judging that the battery has excessive water content or excessive deformation.

According to a further embodiment of the present disclosure, there is also provided a battery management system including the battery safety detection module as above, wherein deformation of the battery cells in the battery pack and a water content inside the battery pack are measured by the battery safety detection module.

According to a fourth aspect of the present disclosure, there is provided a battery safety detection module in a battery pack, the battery pack including two or more battery cells arranged at a predetermined space, the battery safety detection module including: the capacitance sensing device comprises a first polar plate array, a second polar plate array and a middle polar plate array; and a data processing unit, wherein the data processing unit processes output signals of the first electrode plate array, the second electrode plate array and/or the middle electrode plate array so as to obtain capacitance changes generated by changes of water content in the battery pack and/or capacitance changes generated by changes of distances between the first electrode plate array and the middle electrode plate array and/or between the second electrode plate array and the middle electrode plate array caused by deformation of the battery unit, the first electrode plate array comprises more than two first electrode plates, the second electrode plate array comprises more than two second electrode plates and the middle electrode plate array comprises more than two middle electrode plates, the extending directions of the more than two first electrode plates and the extending directions of the more than two middle electrode plates form a preset angle, the extending directions of the more than two second electrode plates and the extending directions of the more than two middle electrode plates form a preset angle, the first electrode plate array is disposed at or near an outer surface or an inner surface or a vicinity of one of the adjacent battery cells, the second electrode plate array is disposed at or near an outer surface or an inner surface or a vicinity of another of the adjacent battery cells, and the intermediate electrode plate array is disposed between the first electrode plate array and the second electrode plate array, wherein the first electrode plate array, the second electrode plate array, and the intermediate electrode plate array are disposed in a predetermined space and are oppositely disposed.

A first polar plate array, a second polar plate array and an intermediate polar plate array are arranged between every two adjacent batteries of more than two battery units. The first polar plate array, the second polar plate array and the middle polar plate array are arranged in parallel. The predetermined angle is 90 degrees.

And electric conductors or conductive materials are respectively arranged on two sides of the middle polar plate array, and the electric conductors or the conductive materials on the two sides are insulated.

Also included is an application device for applying excitation to one or more of the two or more first plates in a time-sharing manner, to one or more of the two or more second plates in a time-sharing manner, and/or to one or more of the two or more intermediate plates in a time-sharing manner.

The data processing unit obtains a capacitance change value and/or a capacitance change rate measured based on each first polar plate, second polar plate and/or middle polar plate after applying excitation to the first polar plate, the second polar plate and/or the middle polar plate at one time and other times, compares the capacitance change value and/or the capacitance change rate, and judges the change of the water content in the battery pack and/or the deformation position, the deformation amount, the deformation range and/or the deformation type of the battery according to the comparison result.

The first plate and/or the second plate are an electrical conductor or conductive material disposed adjacent to an outer surface of one cell and/or adjacent to an outer surface of another cell, respectively.

And when the capacitance change exceeds a preset threshold value, judging that the battery has excessive water content or excessive deformation.

And when the capacitance change value and/or the capacitance change rate between each first plate and each middle plate and/or the capacitance change value and/or the capacitance change rate between each second plate and each middle plate are consistent, the internal water content of the battery pack is considered to be changed, and when the capacitance change value and/or the capacitance change rate between each first plate and each middle plate and/or the capacitance change value and/or the capacitance change rate between each second plate and each middle plate are inconsistent, the shape of the battery unit is considered to be changed.

The technical solution of the fourth aspect of the present disclosure is different from the example of fig. 7 in that the fourth aspect of the present disclosure further includes an intermediate plate array, and the intermediate plate may include a plurality of strip-shaped intermediate plates.

For example, a plurality of first plates may extend in parallel in a first direction, a plurality of second plates may extend in parallel in the first direction, and a plurality of middle plates may extend in a second direction at an angle to the first direction, for example, the angle may be 90 degrees, wherein the middle plates may be disposed at both sides so as to correspond to the first and second plates, respectively. The measurement method may also be similar to the technical solution of the second aspect, and is not described herein again.

According to a further embodiment of the present disclosure, there is provided a battery management system including the battery safety detection module as above, wherein deformation of the battery cells in the battery pack and/or moisture content inside the battery plate are measured by the battery safety detection module.

Further, the case of measuring the induced capacitance between two plates is given in the above example, but the induced capacitance between a plurality of plate units provided on one plate may be measured by one plate in the present disclosure. For example, as shown in fig. 11, the plurality of plate units include transmitting electrodes 131 and receiving electrodes 132, and the transmitting electrodes 131 and the receiving electrodes 132 are arranged in a staggered manner. When the transmitting electrode 131 is excited, the induced capacitance formed between the adjacent transmitting electrode 131 is measured by the receiving electrode 132.

The data processing unit may include an applying unit which may provide a square wave voltage, a step wave voltage, etc. of a predetermined hertz, and the sampling unit may receive a signal from the plate, provide the received signal to the analog-to-digital converting unit, and provide the signal to the filtering unit, etc. after being converted by the analog-to-digital converting unit, so that a corresponding capacitance change value may be measured. Furthermore, when a plurality of plates are processed by the data processing unit, a multiplexing unit may be provided before the sampling unit, and for example, a multiplexing switch may be used to select and measure signals of the respective plates.

The applying unit may apply the excitation to the plates, and further, in a case where it is necessary to apply the excitation to the plurality of plates respectively, the applying unit may selectively apply the excitation to the plates by the multiplexing unit. After the excitation is applied, the capacitance values generated by the plates may be sampled by the sampling unit (in the case of sampling a plurality of plates respectively, each plate may be selected by the multiplexing unit to sample the plate), the capacitance values collected by the sampling unit are sent to the analog-to-digital conversion unit, and the analog-to-digital conversion unit may convert the collected capacitance values into digital signals and then filter the digital signals by the filtering unit. The filtering unit may include a linear filter, a nonlinear filter, or a combined filter of the linear filter and the nonlinear filter. The filtered signal is sent to a calculation unit which calculates the value and/or rate of change of capacitance generated by the plates. The calculated capacitance change value and/or capacitance change rate are/is sent to a judgment unit, the judgment unit judges according to the capacitance change value and/or capacitance change rate, for example, the judgment unit can judge whether the capacitance change is caused by the change of the water content or the battery deformation according to the capacitance change value and/or capacitance change rate, and the judgment unit can judge whether the fault occurs according to the capacitance change value and/or capacitance change rate to give an alarm and the like.

In a preferred embodiment of the present disclosure, in the case of including a plurality of first electrode plates, an insulating material or an insulating member may be disposed between the plurality of first electrode plates in order to prevent a short circuit from being formed between the respective first electrode plates when the battery cell is deformed. Further, also in the case of including a plurality of second/intermediate plates, each of the second/intermediate plates may be provided with an insulating material or an insulating member to prevent short-circuiting after deformation. Further, an insulating material or an insulating member may be disposed between the first plate and the second plate, between the first plate and the intermediate plate, and/or between the second plate and the intermediate plate. When the insulating material or the insulating member is provided as described above, the insulating material or the insulating member may be provided between the two electrode plates, or the surface of each electrode plate may be covered with the insulating material or the insulating member.

In addition, although the first plate/the second plate is provided on the outer surface of the battery cell in the above embodiments/examples, the first plate/the second plate may be provided inside the outer surface of the battery cell, for example, inside the outer package of the battery cell.

In the above description, the moisture content may be measured according to the capacitance change value and/or the change rate, and the deformation position, the deformation amount, the deformation range, and/or the deformation type of the battery may be cut off. For example, in the case where a plurality of first plates, second plates, or intermediate plates are provided, the range of the deformation is determined by signals of plates provided at different positions, and for example, when the plate signals at certain positions are changed, the range of the deformation may be determined. The same manner can be used for determining the area where the distortion occurs. In addition, the deformation amount of the battery cell can be obtained according to the magnitude of the capacitance change,

further, according to a modified embodiment of the present disclosure, when the number of the first plate, the second plate, and the intermediate plate is one or more, it may be set so as to detect a change in moisture content and/or deformation.

For example, when there are more than one first plate and one second plate, the number of the first plates can be set to M, M is larger than or equal to 1, the number of the second plates can be set to N, N is larger than or equal to 2, wherein each of the M first plates is respectively acted with each of the N second plates to measure the corresponding capacitance change, for example, when there are 2 first plates and the 2 first plates are used as transmitting electrodes, and 3 second plates are used as receiving electrodes, 1 first plate in the 2 first plates is excited, the induction capacitance formed at the 3 second plates is respectively measured, then the other first plate is excited, and the induction capacitance formed at the 3 second plates is respectively measured. The same principle applies for the case where there is more than one first plate, second plate and intermediate plate. For example, the number of the first polar plates can be set to M, M is larger than or equal to 2, the number of the second polar plates can be set to N, N is larger than or equal to 2, the number of the middle polar plates can be set to M, wherein M is larger than or equal to 1, and the corresponding capacitance change is measured through the action of each of the M middle polar plates and each of the M first polar plates and the N second polar plates respectively.

Further, when the plates are disposed on both sides of the middle plate, the middle portions of the plates on both sides of the middle plate may be disposed to be electrically insulated.

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 management chip, characterized in that the battery management chip is used to detect the shape change of the battery and/or the water content change around the battery, comprising:

A sampling unit, the sampling unit is used to collect the sensed capacitance signal output by the capacitance sensing device for measuring the shape change of the battery and/or the water content change around the battery, wherein when the shape of the battery changes or the water content around the battery occurs changes, the sensed capacitance signal will change; and

A data processing unit, configured to process the inductive capacitance signal collected by the sampling unit, so as to know the shape change of the battery and/or the water content change around the battery through the inductive capacitance signal.

2. The battery management chip according to claim 1, wherein the data processing unit comprises:

an analog-to-digital conversion unit, the analog-to-digital conversion unit is configured to convert the analog signal collected by the sampling unit into a digital signal; and

a filtering unit that filters the digital signal.

3 . The battery management chip according to claim 2 , wherein the filtering unit comprises a linear filter, a nonlinear filter, or a combined filter of a linear filter and a nonlinear filter. 4 .

4. The battery management chip according to claim 3, wherein the data processing unit further comprises:

a calculation unit that calculates the filtered digital signal to obtain a change value and/or a change rate of the inductive capacitance; and

A determination unit, which determines the shape change of the battery and/or the water content change around the battery based on the change value and/or the change rate of the inductive capacitance.

5 . The battery management chip according to claim 4 , wherein the judgment unit can judge the deformation position, deformation amount, deformation range and/or deformation rate of the battery according to the change value and/or change rate of the inductive capacitance. 6 . Deformation type.

6 . The battery management chip according to claim 1 , wherein the battery management chip further comprises an applying unit, and the applying unit is configured to apply excitation to the capacitance sensing device. 7 .

7 . The battery management chip according to claim 1 , wherein the battery management chip further comprises a multiplexing unit, the multiplexing unit is configured to select and receive the sensed capacitance signal output by the capacitance sensing device, and to sense the capacitance. 8 . A capacitance signal is provided to the sampling unit.

8. The battery management chip according to any one of claims 1 to 7, wherein the battery management chip is used to detect the shape change of the battery in the battery pack and/or the water content change inside the battery pack, so The battery pack includes two or more battery cells, and the two or more battery cells are arranged at intervals of a predetermined space. The capacitance sensing device includes a first pole plate and a second pole plate, and the first pole plate is arranged on the adjacent battery cells. the outer surface, the vicinity of the outer surface, the inner surface or the vicinity of the inner surface of one battery unit, the second electrode plate is arranged on the outer surface, the vicinity of the outer surface, the inner surface or the inner surface of another battery unit of the adjacent battery unit near the surface, wherein the first electrode plate and the second electrode plate are arranged opposite to each other.

9 . The battery management chip of claim 8 , wherein a first electrode plate and a second electrode plate are disposed between every two adjacent batteries of the two or more battery cells. 10 .

10 . The battery management chip according to claim 8 , wherein the first electrode plate and/or the second electrode plate is a conductor for battery packaging. 11 .

11. The battery management chip according to claim 8, wherein the first electrode plate and/or the second electrode plate are respectively arranged on the outer surface, the vicinity of the outer surface, the inner surface, or the vicinity of the inner surface of the battery conductors or conductive materials.

12 . The battery management chip of claim 8 , wherein the first electrode plate and the second electrode plate are arranged in parallel. 13 .

13 . The battery management chip of claim 8 , wherein the first electrode plate comprises one or more first electrode plate units, the second electrode plate includes more than one second electrode plate unit, and the first electrode plate includes more than one second electrode plate unit. A pole plate unit and a second pole plate unit are arranged in a one-to-one correspondence to form a capacitance sensing unit, and the sampling unit collects the sensing capacitance generated by each capacitance sensing unit.

14 . The battery management chip of claim 8 , wherein the first electrode plate comprises more than one first electrode plate unit, the second electrode plate includes two or more second electrode plate units, and one first electrode plate unit. 15 . One electrode plate unit is disposed corresponding to at least two or more second electrode plate units to form a capacitance sensing unit, and the sampling unit collects the sensing capacitance generated by each capacitance sensing unit.

15. The battery management chip according to claim 13, wherein the shape of the first electrode plate unit and the second electrode plate unit is at least one of a circle, an ellipse, and a polygon, and one-to-one correspondence The provided first electrode plate unit and the second electrode plate unit are respectively arranged on the first electrode plate and the second electrode plate.

16 . The battery management chip of claim 13 , wherein the first electrode plate unit and the second electrode plate unit are strip-shaped, and the first electrode plate unit extends on the first electrode plate. 17 . The direction forms a predetermined angle with the extending direction of the second pole plate unit on the second pole plate.

17. The battery management chip of claim 13, wherein the first plate unit and the second plate unit are respectively a driving unit and a receiving unit or a receiving unit and a driving unit, and the sampling unit The inductive capacitances generated between each receiving unit and the corresponding driving unit and adjacent driving units are collected.

18. The battery management chip according to claim 16, wherein the first plate unit and the second plate unit are respectively a driving unit and a receiving unit or a receiving unit and a driving unit, and the sampling unit Collect the inductive capacitance generated between each receiving unit and each driving unit.

19. The battery management chip according to claim 14, wherein the first plate unit and the second plate unit are respectively a driving unit and a receiving unit or a receiving unit and a driving unit, and the sampling unit The inductive capacitance generated between each receiving unit and the corresponding driving unit is collected.

20. The battery management chip according to any one of claims 1 to 7, wherein the battery management chip is used to detect the shape change of the battery in the battery pack and/or the water content change inside the battery pack, so The battery pack includes two or more battery cells, the two or more battery cells are arranged at a predetermined space, and the capacitance sensing device includes a first pole plate, and the first pole plate is arranged on the side of one of the adjacent battery cells. The outer surface, the vicinity of the outer surface, the inner surface or the vicinity of the inner surface, and the first pole plate includes two or more driving pole plate units and more than two receiving pole plate units, the driving pole plate unit and the pole plate unit Staggered arrangement.

21. The battery management chip according to claim 20, wherein a first electrode plate is provided between every two adjacent batteries of two or more battery cells, or a first electrode plate is provided on each battery cell. A plate.

22. The battery management chip of claim 21, wherein the first electrode plate is a conductor for battery packaging.

23 . The battery management chip of claim 20 , wherein the first electrode plate is a conductor or conductive material respectively disposed on the outer surface, near the outer surface, inner surface, or near the inner surface of the battery. 24 .

24 . The battery management chip of claim 20 , wherein the sampling unit collects the inductive capacitance generated between each receiver plate unit and an adjacent emitter plate unit. 25 .

25. The battery management chip according to any one of claims 1 to 7, wherein the battery management chip is used to detect the shape change of the battery in the battery pack and/or the water content change inside the battery pack, so the The battery pack includes two or more battery cells, and the two or more battery cells are arranged at intervals of a predetermined space, and the capacitance sensing device includes a first pole plate, a second pole plate and an intermediate pole plate, and the first pole plate is arranged on the The outer surface, the vicinity of the outer surface, the inner surface or the vicinity of the inner surface of one battery cell of the adjacent battery cells, the second electrode plate is arranged on the outer surface, the vicinity of the outer surface of the other battery cell of the adjacent battery cells, At or near the inner surface, the intermediate pole plate is disposed between the first pole plate and the second pole plate.

26 . The battery management chip of claim 25 , wherein a first electrode plate, a second electrode plate and an intermediate electrode plate are arranged between every two adjacent batteries of two or more battery cells. 27 .

27. The battery management chip of claim 25, wherein:

The first electrode plate and the middle electrode plate form a first capacitance sensing structure, the first capacitance sensing structure is used to measure the one battery cell, and the second electrode plate and the middle electrode plate form a second electrode. A capacitance sensing structure, the second capacitance sensing structure is used to measure the other battery cell.

28. The battery management chip according to claim 27, wherein the first electrode plate and/or the second electrode plate is a conductor for battery packaging.

29. The battery management chip of claim 27, wherein the first electrode plate and/or the second electrode plate are respectively disposed on the outer surface, near the outer surface, inner surface, or near the inner surface of the battery The conductor or conductive material, the intermediate plate is a conductor.

30. The battery management chip of claim 27, wherein the first electrode plate, the second electrode plate and the middle electrode plate are arranged in parallel.

31. The battery management chip of claim 27, wherein the first electrode plate comprises more than one first electrode plate unit, the middle electrode plate includes more than one middle electrode plate unit, and the first electrode plate includes more than one middle electrode plate unit. The plate unit and the intermediate plate unit are arranged in a one-to-one correspondence and form a capacitance sensing unit, and the sampling unit collects the sensing capacitance generated by each capacitance sensing unit.

32. The battery management chip of claim 31, wherein the second electrode plate comprises more than one second electrode plate unit, the intermediate electrode plate includes more than one middle electrode plate unit, and the second electrode plate includes more than one second electrode plate unit. The plate unit and the intermediate plate unit are arranged in a one-to-one correspondence and form a capacitance sensing unit, and the sampling unit collects the sensing capacitance generated by each capacitance sensing unit.

33. The battery management chip of claim 27, wherein the first electrode plate comprises more than one first electrode plate unit, the intermediate electrode plate includes two or more middle electrode plate units, and one first electrode plate unit The plate unit is arranged corresponding to at least two or more middle plate units to form a capacitance sensing unit, and the sampling unit collects the sensing capacitance generated by each capacitance sensing unit.

34. The battery management chip of claim 33, wherein the second pole plate comprises more than one second pole plate unit, the intermediate pole plate comprises two or more intermediate pole plate units, one second pole plate unit The plate unit is arranged corresponding to at least two or more middle plate units to form a capacitance sensing unit, and the sampling unit collects the sensing capacitance generated by each capacitance sensing unit.

35. The battery management chip of claim 32, wherein the shape of the first pole plate unit, the second pole plate unit and the middle pole plate unit is at least one of a circle, an ellipse, and a polygon , and the first pole plate unit and the second pole plate unit which are arranged in a one-to-one correspondence are respectively arranged on the first pole plate and the second pole plate.

36. The battery management chip of claim 34, wherein the shape of the first pole plate unit, the second pole plate unit and the middle pole plate unit is at least one of a circle, an ellipse, and a polygon , and the first pole plate unit and the second pole plate unit which are arranged in a one-to-one correspondence are respectively arranged on the first pole plate and the second pole plate.

37 . The battery management chip of claim 31 , wherein the first electrode plate unit and the middle electrode plate unit are strip-shaped, and the extension direction of the first electrode plate unit on the first electrode plate is 37 . forming a predetermined angle with the extending direction of the intermediate pole plate unit on the intermediate pole plate.

38. The battery management chip according to claim 37, wherein the second pole plate unit and the middle pole plate unit are strip-shaped, and the extension direction of the second pole plate unit on the second pole plate forming a predetermined angle with the extending direction of the intermediate pole plate unit on the intermediate pole plate.

39. The battery management chip of claim 13, wherein the first plate unit and the second plate unit are respectively a driving unit and a receiving unit or a receiving unit and a driving unit, and the sampling unit The inductive capacitances generated between each receiving unit and the corresponding driving unit and adjacent driving units are collected.

40. The battery management chip according to any one of claims 31 to 39, wherein the first pole plate and the second pole plate are driving pole plates or receiving pole plates, and the middle pole plate For the receiving electrode plate or the driving electrode plate, the sampling unit collects the inductive capacitance generated between each receiving electrode plate and each driving electrode plate.

41. The battery management chip according to claim 40, wherein the two sides of the intermediate pole plate are respectively provided with a first intermediate pole plate unit corresponding to the first pole plate unit and a first intermediate pole plate unit corresponding to the second pole plate unit respectively of the second intermediate plate unit.

42. A battery management system, characterized by comprising the battery management chip according to any one of claims 1 to 42, through which the shape change of the battery and/or the water content around the battery are measured The change.