CN112798662A

CN112798662A - Battery safety detection device and battery management system

Info

Publication number: CN112798662A
Application number: CN202110000271.7A
Authority: CN
Inventors: 周号
Original assignee: Zhuhai Maiju Microelectronics Co Ltd
Current assignee: Zhuhai Maiju Microelectronics Co Ltd
Priority date: 2021-01-02
Filing date: 2021-01-02
Publication date: 2021-05-14

Abstract

The utility model provides a battery safety inspection device, battery safety inspection device measure the battery cell in the battery package, and the battery package includes more than two battery cells, and the predetermined spatial arrangement is separated to more than two battery cells. The present disclosure also provides a battery management system.

Description

Battery safety detection device and battery management system

Technical Field

The present disclosure relates to a battery safety detection device 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 effective battery deformation detection method, which can be used to detect each battery in a battery pack, and perform a determination according to 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 safety detection device and a battery management system.

According to an aspect of the present disclosure, a battery safety detecting device that measures moisture in a battery pack including two or more battery cells arranged at a predetermined interval, includes:

a capacitance sensing device including a first plate disposed on, near, or inside an outer surface of one of adjacent battery cells and a second plate disposed on, near, or inside an outer surface of another of the adjacent battery cells, wherein the first plate and the second plate are disposed in the predetermined space and are oppositely disposed; and

a processing device that processes the output signal of the first plate and/or the second plate to obtain a change in capacitance between the first plate and the second plate caused by a change in moisture between the battery cells.

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 number of the first electrode plates and the number of the second electrode plates are respectively two or more, the two or more first electrode plates and the two or more second electrode plates are arranged in a one-to-one correspondence manner and form two or more capacitance sensing units, and the processing device respectively obtains the variable capacitances respectively formed by the two or more capacitance sensing units; or

One of the first polar plate and the second polar plate is used as a transmitting electrode, the other of the first polar plate and the second polar plate is used as a receiving electrode, the number of the first polar plate is more than one, the number of the second polar plate is more than two, and the processing device respectively obtains and detects that the more than two second polar plates respectively form variable capacitances with the more than one first polar plate.

According to at least one embodiment of the present disclosure, the processing device includes a comparison unit configured to compare the respective changed capacitances and determine a change in moisture between the batteries according to a result of the comparison.

According to at least one embodiment of the present disclosure, the first electrode plate and/or the second electrode plate is/are the one battery cell packaging electrical conductor and/or the other battery cell packaging electrical conductor.

According to at least one embodiment of the present disclosure, the first and/or second plate is an electrical conductor or conductive material disposed near or within an outer surface of the one battery cell and/or near or within an outer surface of the other battery cell, 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 apparatus further comprises an application device for applying an excitation to the first and/or second plate.

According to at least one embodiment of the present disclosure, when a change rate or a change value of the change capacitance exceeds a predetermined threshold value, it is determined that the moisture contained between the batteries is excessive.

According to at least one embodiment of the present disclosure, the battery safety detection apparatus is further configured to measure deformation of a battery unit in the battery pack, and the comparison unit is configured to compare change rates or change values of the respective change capacitances, and determine a deformation position, a deformation amount, a deformation range, and/or a deformation type of the battery according to a comparison result.

According to at least one embodiment of the present disclosure, when the change rate or the change value of each of the change capacitances is consistent, it is determined that the change capacitance is caused by moisture, and when the change rate or the change value of each of the change capacitances is inconsistent, it is determined that the change capacitance is caused by the deformation.

According to an aspect of the present disclosure, a battery management system includes the battery safety detection device as described above, by which moisture in the battery pack is measured.

a capacitive sensing device comprising a first plate and a second plate, wherein the first plate comprises more than one first plate unit and the second plate comprises more than two second plate units, the first plate is arranged near the outer surface, the inner surface or the inner surface of one battery unit of the adjacent battery units, the second plate unit is arranged near the outer surface, the inner surface or the inner surface of the other battery unit of the adjacent battery units, and the first plate and the second plate are arranged oppositely; and

processing means for processing the output signals of said first plate and/or said second array of plates to obtain a change in capacitance between said first array of plates and said second array of plates when moisture changes between cells,

According to at least one embodiment of the present disclosure, the extending direction of the one or more first plate units and the extending direction of the two or more second plate units form a predetermined angle.

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

According to at least one embodiment of the present disclosure, the apparatus further includes an applying device, when the number of the first plate units of the first plate is two or more, the plate unit of one of the first plate and the second plate is used as a transmitting electrode, the plate unit of the other of the first plate and the second plate is used as a receiving electrode, the applying device is configured to apply excitation to the transmitting electrode in a time-sharing manner, and the processing device is configured to obtain a varying capacitance signal for detecting the receiving electrode.

According to at least one embodiment of the present disclosure, the apparatus further includes an applying device, when the number of the first plate units of the first plate is one, the second plate units of the first plate or the second plate are used as transmitting electrodes, the second plate units of the second plate or the first plate are used as receiving electrodes, the applying device is configured to apply excitation to the transmitting electrodes in a time-sharing manner, and the processing device is configured to obtain the signals of the changed capacitances of the receiving electrodes.

According to at least one embodiment of the present disclosure, the processing device obtains a varying capacitance signal based on measurements from the receiving electrode after applying the excitation to the transmitting electrode at one time and at other times, compares the varying capacitance signal, and determines a change in water content within the battery pack according to the comparison result.

According to at least one embodiment of the present disclosure, when a capacitance change rate or a change value of the varying capacitance signal exceeds a predetermined threshold, it is determined that the moisture content between the batteries is excessive.

According to at least one embodiment of the present disclosure, the battery safety detection apparatus is further configured to measure deformation of a battery unit in the battery pack, and the comparison unit is configured to compare a capacitance change rate or a change value of the change capacitance signal measured by the receiving electrode, and determine a deformation position, a deformation amount, a deformation range, and/or a deformation type of the battery according to a comparison result.

According to at least one embodiment of the present disclosure, when the capacitance change rates or the change values of the changed capacitance signals are consistent, it is considered that the changed capacitance signals of the battery cells are caused by changes in the water content, and when the capacitance change rates or the change values of the changed capacitance signals are inconsistent, it is considered that the changed capacitance signals of the battery cells are caused by deformation of the battery cells.

According to an aspect of the present disclosure, a battery management system includes the battery safety detection apparatus as described above, by which the water content and/or the battery deformation in the battery pack are measured.

a capacitive sensing device comprising a first plate, a second plate, and a middle plate; and

processing means for processing the output signals of the first plate, the second plate and/or the intermediate plate so as to obtain a change in capacitance between the first plate and the intermediate plate and/or between the second plate and the intermediate plate caused by a change in moisture of the battery pack,

the first plate is disposed adjacent to an outer surface, an inner surface, or an inner surface of one of the adjacent battery cells, the second plate is disposed adjacent to an outer surface, an inner surface, or an inner surface of the other of the adjacent battery cells, the intermediate plate is disposed between the first plate and the second plate, and the intermediate plate is disposed opposite to the first plate and the second plate, respectively.

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 electrode plate and the middle electrode plate form a first capacitance sensing unit, in the first capacitance sensing unit, one electrode plate of the first electrode plate and the middle electrode plate is used as a transmitting electrode, the other electrode plate is used as a receiving electrode, the number of one electrode of the transmitting electrode and the receiving electrode is more than one, the number of the other electrode is more than two, and the processing unit respectively detects the variable capacitance formed by each receiving electrode with respect to each transmitting electrode; and

the second electrode plate and the middle electrode plate form a second capacitance sensing unit, in the second capacitance sensing unit, one electrode plate of the second electrode plate and the middle electrode plate is used as a transmitting electrode, the other electrode plate is used as a receiving electrode, the number of the transmitting electrode and the receiving electrode is more than one, the number of the other electrode is more than two, and the processing unit respectively detects the variable capacitance formed by each receiving electrode relative to each transmitting electrode.

According to at least one embodiment of the present disclosure, the processing device includes a comparison unit for comparing the varied capacitances obtained from the respective receiving electrodes, and determining a variation in water content between the cells according to the comparison result.

According to at least one embodiment of the present disclosure, the first electrode plate and/or the second electrode plate is/are the one battery cell packaging electrical conductor and/or the other battery cell packaging electrical conductor, and the intermediate electrode plate is an electrical conductor or an electrically conductive material provided between the first electrode plate and the second electrode plate.

According to at least one embodiment of the present disclosure, the first and/or second electrode plate is an electrical conductor or conductive material disposed near or inside an outer surface of the one battery cell and/or near or inside an outer surface of the other battery cell, respectively, and the intermediate electrode plate is an electrical conductor or conductive material disposed in the predetermined space between the first and second electrode plates.

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 apparatus further comprises an application device for applying a stimulus to the first plate, the second plate and/or the intermediate plate.

According to at least one embodiment of the present disclosure, when the capacitance change rate or the change value exceeds a predetermined threshold value, it is determined that the moisture contained between the batteries is excessive.

According to at least one embodiment of the present disclosure, an electric conductor or an electric conducting material is respectively disposed on two sides of the middle polar plate, and the electric conductor or the electric conducting material on the two sides is insulated.

According to at least one embodiment of the present disclosure, the battery safety detection apparatus is further configured to measure deformation of a battery unit in the battery pack, and the comparison unit is configured to compare a capacitance change rate or a change value, and determine a deformation position, a deformation amount, a deformation range, and/or a deformation type of the battery according to a comparison result.

According to at least one embodiment of the present disclosure, when the capacitance change rate or the change value is consistent, it is determined that the capacitance change is caused by the change in the water content, and when the capacitance change rate or the change value is inconsistent, it is determined that the capacitance change is caused by the deformation.

According to an aspect of the present disclosure, a battery management system includes the battery safety detection apparatus as described above, by which a change in water content in the battery pack and/or a battery deformation is measured.

a capacitance sensing device comprising a first plate, a second plate, and an intermediate plate, wherein the first plate comprises one or more first plate units, the second plate comprises one or more second plates, and the intermediate plate comprises one or more intermediate plates, the first plate is disposed adjacent to an outer surface, an inner surface, or an inner surface of one of adjacent battery units, the second plate is disposed adjacent to an outer surface, an inner surface, or an inner surface of another of the adjacent battery units, the intermediate plate is disposed between the first plate and the second plate, wherein the first plate, the second plate, and the intermediate plate are disposed in the predetermined space and are disposed opposite to each other; and

processing means for processing the output signals of the first plate, the second plate and/or the intermediate plate to obtain a change in capacitance generated between the first plate and the intermediate plate and/or between the second plate and the intermediate plate when a change in moisture content in the battery pack causes the change in capacitance to occur.

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 extending direction of the one or more first electrode plates and the extending direction of the one or more middle electrode plates form a predetermined angle, the extending direction of the one or more second electrode plates and the extending direction of the one or more middle electrode plates form a predetermined angle, and the predetermined angle is 90 degrees.

According to at least one embodiment of the present disclosure, the apparatus further comprises an applying device for applying a stimulus to one or more first plate units of the two or more first plates in a time-sharing manner, applying a stimulus to one or more second plate units of the two or more second plates in a time-sharing manner, and/or applying a stimulus to one or more middle plates of the two or more middle plates in a time-sharing manner, a plate corresponding to the excited plate serves as a receiving electrode, and a capacitance change is measured from the receiving electrode.

According to at least one embodiment of the present disclosure, the processing device obtains a capacitance change measured based on each of the first plate, the second plate and/or the intermediate plate after applying the excitation to the first plate, the second plate and/or the intermediate plate at one time and other times, compares the capacitance changes, and judges a change in the moisture content in the battery pack according to the comparison result.

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

According to at least one embodiment of the disclosure, the processing device obtains a capacitance change rate or change value measured based on each first pole plate, second pole plate and/or middle pole plate after applying excitation to the first pole plate, second pole plate and/or middle pole plate at one time and other times, compares the capacitance change rate or change value, and judges a deformation position, deformation amount, deformation range and/or deformation type of the battery according to the comparison result.

According to at least one embodiment of the present disclosure, when the capacitance change rate or change value between each first plate and each intermediate plate is consistent, and/or when the capacitance change rate or change value between each second plate and each intermediate plate is inconsistent, the moisture between the battery units is considered to be changed, and when the capacitance change rate or change value between each first plate and each intermediate plate is inconsistent, the battery units are considered to be deformed.

According to an aspect of the present disclosure, a battery management system includes the battery safety detection device as described above, by which a moisture change between battery cells in the battery pack 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 safety detection apparatus according to an embodiment of the present disclosure.

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

Fig. 3 shows a schematic diagram of a battery safety detection apparatus according to an embodiment of the present disclosure.

Fig. 4 shows a schematic diagram of a battery safety detection apparatus according to an embodiment of the present disclosure.

Fig. 5 shows a schematic diagram of a battery safety detection apparatus according to an embodiment of the present disclosure.

Fig. 6 shows a schematic diagram of a battery safety detection apparatus according to an embodiment of the present disclosure.

Fig. 7 shows a schematic diagram of a battery safety detection apparatus according to an embodiment of the present disclosure.

Fig. 8 shows a schematic diagram of a processing device of a battery safety detection 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 safety detection apparatus in a battery pack is provided. Wherein this battery safety inspection device can measure the moisture or the water content that contains in the battery package, also can come the deformation of measuring battery cell in the battery package.

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 shows a battery safety detection device in a battery pack according to a first aspect of the present disclosure.

As shown in fig. 1, the battery pack 10 may include more than two battery cells. While three

battery cells

110, 120, and 130 are shown in fig. 1, it should be 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

110, 120, and 130 are arranged at predetermined intervals.

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

The capacitance sensing device may include a first plate 210 disposed on, near, or inside an outer surface of one of the neighboring battery cells and a second plate 220 disposed on, near, or inside an outer surface of the other of the neighboring battery cells, wherein the first plate 210 and the second plate 220 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. 1, a first plate 210 may be disposed on an outer surface of the first cell 110, and correspondingly a second plate 220 may be disposed on an outer surface of the second cell 120, a first plate 210 may be disposed on an outer surface of the other side of the second cell, and correspondingly a second plate 220 may be disposed on an outer surface of the third cell 130.

And a processing device 300 for processing the output signal of the first plate 210 and/or the second plate 220 so as to obtain a capacitance change between the first plate 210 and the second plate 220 caused by moisture around the battery cell and/or deformation of the battery cell.

In various embodiments or examples of the present disclosure, when the moisture content of the battery cell changes, the dielectric constant between the plates changes due to the change in moisture content, which in turn will cause the sensed capacitance value between the plates to change. This allows for effective measurement of changes in moisture content by the capacitive sensing apparatus of the present disclosure. When the water content is too high, alarm processing and the like can be performed.

In addition, when the moisture content is changed, the dielectric constant caused by moisture in the battery pack will be uniformly changed, that is, the change in the dielectric constant caused by moisture in the battery pack is generally changed by the same amount throughout the battery pack.

In addition, the processing device 300 processes the output signal of the first plate 210 and/or the second plate 220, and can obtain the capacitance change between the first plate 210 and the second plate 220 generated when the deformation of the battery unit causes the distance change between the first plate 210 and the second plate 220. 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. 2 shows a perspective view of the battery pack. Fig. 3 shows a schematic view of moisture contained in the battery pack. Fig. 4 shows a schematic diagram of a battery after deformation, wherein the deformation shown in fig. 4 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

210 and 220 may vary due to variations in the moisture content of the battery pack. The first and

second electrode plates

210 and 220 are deformed due to the deformation of the battery cell. When the first plate 210 and the second plate 220 are deformed, the capacitance between the first plate 210 and the second plate 220 will also be 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 and

second electrode plates

210 and 220 disposed at the outer surface of one battery may be two or more. The two or more first electrode plates 210 and the two or more second electrode plates 220 are disposed in a one-to-one correspondence manner and form two or more capacitance sensing units, and the processing device respectively obtains unit capacitance variation values respectively formed by the two or more capacitance sensing units.

Fig. 5 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 and second electrode plates, taking the first and

second battery cells

110 and 120 as an example, a plurality of first electrode plates 210 are provided on the outer surface of the first battery cell 110, and correspondingly, a plurality of second electrode plates 220 are provided on the outer surface of the second battery cell 120. 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 110 and/or the second battery unit 120 at the positions of a certain first polar plate 210 and a certain second polar plate 220 are deformed, the static capacitance values generated by the first polar plate 210 and the second polar plate 220 are changed, and therefore, the deformation of the first battery unit 110 and/or the second battery unit 120 is obtained by detecting the static capacitance values. 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 processing device 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 moisture 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. 4 occurs, the change value and/or the change rate of the electrostatic capacitance of the middle two first plates 210 and second plates 220 will be significantly different from the change value and/or the change rate of the electrostatic capacitance of the two first plates 210 and second plates 220 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 plates 210 and second plates 220, the position where the deformation occurs can be obtained, and the type of the deformation can also be obtained by the deformation position. 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 detecting device 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.).

According to another aspect of the present disclosure, there is also provided a battery management system including the above battery safety detection apparatus, 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 detecting device in a battery pack, the battery pack including two or more battery cells arranged at a predetermined space, the battery safety detecting device including: the capacitance sensing device comprises a first polar plate array and a second polar plate array; and processing means for processing the output signals of the first and/or second electrode arrays so as to obtain a change in capacitance between the first and second electrode arrays generated when the moisture content in the battery pack changes, wherein the first electrode array includes two or more first electrodes and the second electrode array includes two or more second electrodes, the extending direction of the two or more first electrodes is at a predetermined angle to the extending direction of the two or more second electrodes, the first electrode array is disposed on, near or inside an outer surface of one of the adjacent battery cells, the second electrode array is disposed on, near or inside an outer surface of another of the adjacent battery cells, and the first and second electrode arrays are disposed in a predetermined space and face each other. 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. 6 shows a schematic arrangement of the first and second plates of the first and second battery cells.

As shown in fig. 6, the first plate 210 disposed in the first plate array of the first battery cell 110 may extend in the first direction and may be disposed in plurality in parallel, and the second plate 220 disposed in the second plate array of the second battery cell 120 may extend in the second direction and may also be disposed in plurality in parallel. In this way, when the first plate 210 and the second plate 220 are disposed opposite to each other, the change in the moisture content of the battery pack and/or the deformation of the battery cell may be sensed by the capacitance value generated between the first plate 210 and the second plate 220. It should be noted that although the first plate 210 and the second plate 220 are configured as long strips in fig. 6, they may also take other shapes, and are not limited in this disclosure.

The battery safety detection device 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 210 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 processing device 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 the bulge-type fault of the shape shown in fig. 3 occurs, the change value and/or the change rate of the electrostatic capacitance of the first plate 210 and the second plate 220 at the bulge position is larger than the change value and/or the change rate of the electrostatic capacitance of the two first plates 210 and the second plate 220 at the two sides, so that by detecting the change value and/or the change rate of the electrostatic capacitance of the detection unit formed by each first plate 210 and the second plate 220, the position where the deformation occurs can be obtained, and the type of the deformation and the like can also be obtained by the position of the 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 above battery safety detection apparatus, through which the moisture content and/or deformation of the battery cells in the battery pack is measured.

According to a third aspect of the present disclosure, there is provided a battery safety detecting device in a battery pack including two or more battery cells arranged at a predetermined space, the battery safety detecting device comprising: the capacitance induction device comprises a first polar plate, a second polar plate and a middle polar plate; and a processing device for processing the output signals of the first plate, the second plate and/or the intermediate plate so as to obtain capacitance changes between the first plate and the intermediate plate and/or between the second plate and the intermediate plate generated when the change of the water content in the battery pack and/or the deformation of the battery units causes the change of the distance between the first plate and the intermediate plate and/or between the second plate and the intermediate 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 intermediate plate is arranged between the first plate and the second plate, and the intermediate plate is respectively arranged opposite to the first plate and the second plate in a preset space.

A first polar plate, a second polar plate and a middle polar plate are arranged between every two adjacent batteries of more than two battery units.

As shown in fig. 7, an intermediate plate 230 is disposed between the first plate 210 and the second plate 220, the change of the water content inside the battery pack and/or the deformation of the first battery unit 110 can be known through the capacitance change between the intermediate plate 230 and the first plate 210, and the change of the water content inside the battery pack and/or the deformation of the second battery unit 120 can be known through the capacitance change between the intermediate plate 230 and the second plate 220. 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 conductive body is a whole conductive body, the change of the moisture content inside the battery pack, and/or the deformation of the first battery unit 110 and the deformation of the second battery unit 120 can be obtained by detecting the capacitance change between the middle plate and the first plate, and the capacitance change between the middle plate and the second plate, respectively. When the electrical conductor/conductive material is provided on both sides of the middle plate, the change in the water content inside the pack and/or the deformation of the first cell 110 is measured by the electrical conductor/conductive material on the opposite side of the middle plate corresponding to the first plate, and the change in the water content inside the pack and/or the deformation of the second cell 120 is measured by the electrical conductor/conductive material 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 embodiment shown in fig. 5, 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 processing device 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 processing device comprises a comparison unit, wherein 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 above battery safety detection apparatus, 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 apparatus.

According to a fourth aspect of the present disclosure, there is provided a battery safety detecting device in a battery pack, the battery pack including two or more battery cells arranged at a predetermined space, the battery safety detecting device including: the capacitance sensing device comprises a first polar plate array, a second polar plate array and a middle polar plate array; and processing means for processing the output signals of the first plate array, the second plate array and/or the intermediate plate array so as to obtain a change in capacitance generated by a change in water content inside the battery pack and/or a change in capacitance generated when the battery cell deforms to cause a change in distance between the first plate array and the intermediate plate array and/or between the second plate array and the intermediate plate array, wherein the first plate array includes two or more first plates, the second plate array includes two or more second plates, and the intermediate plate array includes two or more intermediate plates, the extending directions of the two or more first plates are at predetermined angles to the extending directions of the two or more intermediate plates, the extending directions of the two or more second plates are at predetermined angles to the extending directions of the two or more intermediate plates, and the first plate array is disposed at or near the outer surface or the inner surface or the vicinity of one battery cell of an adjacent battery cell And a second plate array disposed at or near an outer surface or at or near an inner surface of another battery cell of the adjacent battery cells, and an intermediate plate array disposed between the first plate array and the second plate array, wherein the first plate array, the second plate array, and the intermediate 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 processing device 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. 6 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 above battery safety detection apparatus, by which deformation of a battery cell in a battery pack and/or moisture content inside a battery panel is measured.

Fig. 8 shows a schematic diagram of a processing device according to an embodiment of the present disclosure, wherein the processing device may include an applying unit, the applying unit may provide a square wave voltage, a step wave voltage, and the like at a predetermined hertz, and the sampling unit may receive a signal from the plate, provide the received signal to an analog-to-digital converting unit, provide the signal to a filtering unit after conversion by the analog-to-digital converting unit, and the like, so that a corresponding capacitance change value may be measured. Furthermore, when a plurality of plates are processed by the processing device, 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.

As shown in fig. 8, the applying unit may apply the excitation to the plates, and further, in a case where it is necessary to apply the excitation to each of the plurality of plates, 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 safety detecting device, wherein the battery safety detecting device measures moisture in a battery pack including two or more battery cells arranged at a predetermined interval, the battery safety detecting device comprising:

2. The battery safety detecting device according to claim 1, wherein a first electrode plate and a second electrode plate are provided between each two adjacent batteries of the two or more battery units;

or;

the number of the first polar plates and the number of the second polar plates are respectively more than two, the more than two first polar plates and the more than two second polar plates are arranged in a one-to-one correspondence manner and form more than two capacitance sensing units, and the processing device respectively obtains the variable capacitance formed by the more than two capacitance sensing units; or

One of the first polar plate and the second polar plate is used as a transmitting electrode, the other of the first polar plate and the second polar plate is used as a receiving electrode, the number of the first polar plate is more than one, the number of the second polar plate is more than two, and the processing device respectively obtains and detects that the more than two second polar plates respectively form variable capacitance with the more than one first polar plate;

or;

the processing device comprises a comparison unit, wherein the comparison unit is used for comparing the variable capacitances and judging the moisture change among the batteries according to the comparison result;

or;

the first polar plate and/or the second polar plate is/are an electric conductor for packaging one battery unit and/or an electric conductor for packaging the other battery unit;

or;

the first polar plate and/or the second polar plate are electric conductors or conductive materials which are respectively arranged near or inside the outer surface of one battery unit and/or near or inside the outer surface of the other battery unit;

or;

the first polar plate and the second polar plate are arranged in parallel;

or;

further comprising an application device for applying an excitation to the first and/or second plate;

or;

when the change rate or the change value of the change capacitance exceeds a preset threshold value, judging that the moisture contained between the batteries is excessive;

or;

the battery safety detection device is also used for measuring the deformation of the battery unit in the battery pack, and the comparison unit is used for comparing the change rate or the change value of each variable capacitor and judging the deformation position, the deformation amount, the deformation range and/or the deformation type of the battery according to the comparison result;

or;

and when the change rates or the change values of the variable capacitors are inconsistent, judging that the variable capacitors are caused by the deformation.

3. A battery management system comprising the battery safety detection device according to any one of claims 1 to 2, wherein moisture in the battery pack is measured by the battery safety detection device.

4. A battery safety detecting device, wherein the battery safety detecting device measures moisture in a battery pack including two or more battery cells arranged at a predetermined interval, the battery safety detecting device comprising:

processing means for processing the output signals of said first plate and/or said second array of plates to obtain a change in capacitance between said first array of plates and said second array of plates when moisture changes between cells.

5. The battery safety detecting device according to claim 4, wherein a first electrode plate and a second electrode plate are provided between each two adjacent batteries of the two or more battery units;

or;

the first polar plate and the second polar plate are arranged in parallel;

or;

the extending direction of the more than one first polar plate units and the extending direction of the more than two second polar plate units form a preset angle;

or;

the first polar plate and/or the second polar plate are electric conductors or conductive materials which are arranged opposite to the battery unit respectively;

or;

the device comprises a first electrode plate unit, a second electrode plate unit, a processing unit and a transmitting unit, wherein the first electrode plate unit comprises a first electrode plate unit and a second electrode plate unit, the second electrode plate unit comprises a first electrode plate unit and a second electrode plate unit, the first electrode plate unit comprises a first electrode plate and a second electrode plate unit, the second electrode plate unit comprises a second electrode plate, the first electrode plate unit comprises a first electrode plate and a second electrode plate, the second electrode plate unit comprises a second electrode plate and a third electrode plate, the third electrode plate unit comprises a third;

or;

the device further comprises an applying device, when the number of the first plate units of the first plate is one, the second plate units of the first plate or the second plate are used as transmitting electrodes, the second plate units of the second plate or the first plate are used as receiving electrodes, the applying device is used for applying excitation to the transmitting electrodes in a time-sharing manner, and the processing device is used for respectively acquiring variable capacitance signals of the receiving electrodes;

or;

the processing device acquires a variable capacitance signal measured from the receiving electrode after applying excitation to the transmitting electrode at one time and other times, compares the variable capacitance signal, and judges the change of the water content in the battery pack according to the comparison result;

or;

when the capacitance change rate or the change value of the change capacitance signal exceeds a preset threshold value, judging that the water content between the batteries is excessive;

or;

the battery safety detection device is also used for measuring the deformation of a battery unit in the battery pack, the comparison unit is used for comparing the capacitance change rate or the change value of the change capacitance signal measured by the receiving electrode, and judging the deformation position, the deformation amount, the deformation range and/or the deformation type of the battery according to the comparison result;

or;

and when the capacitance change rates or the change values of the variable capacitance signals are inconsistent, the variable capacitance signals of the battery unit are considered to be caused by the deformation of the battery unit.

6. A battery management system comprising the battery safety detection device according to any one of claims 4 to 5, wherein the water content and/or the battery deformation in the battery pack are measured by the battery safety detection device.

7. A battery safety detecting device, wherein the battery safety detecting device measures moisture in a battery pack including two or more battery cells arranged at a predetermined interval, the battery safety detecting device comprising:

8. The battery safety detecting device according to claim 7, wherein a first pole plate, a second pole plate and an intermediate pole plate are disposed between each two adjacent batteries of the two or more battery units;

or;

the first electrode plate and the middle electrode plate form a first capacitance sensing unit, in the first capacitance sensing unit, one electrode plate of the first electrode plate and the middle electrode plate is used as a transmitting electrode, the other electrode plate is used as a receiving electrode, the number of one electrode of the transmitting electrode and the receiving electrode is more than one, the number of the other electrode is more than two, and the processing unit respectively detects the variable capacitance formed by each receiving electrode relative to each transmitting electrode; and

the second electrode plate and the middle electrode plate form a second capacitance sensing unit, in the second capacitance sensing unit, one electrode plate of the second electrode plate and the middle electrode plate is used as a transmitting electrode, the other electrode plate is used as a receiving electrode, the number of one electrode of the transmitting electrode and the receiving electrode is more than one, the number of the other electrode is more than two, and the processing unit respectively detects the variable capacitance formed by each receiving electrode relative to each transmitting electrode;

or;

the processing device comprises a comparison unit, wherein the comparison unit is used for comparing the variable capacitance obtained from each receiving electrode and judging the change of the water content among the batteries according to the comparison result;

or;

the first polar plate and/or the second polar plate are/is an electric conductor for packaging one battery unit and/or an electric conductor for packaging the other battery unit, and the middle polar plate is an electric conductor or a conductive material arranged between the first polar plate and the second polar plate;

or;

the first polar plate and/or the second polar plate are/is an electric conductor or an electric conducting material which are respectively arranged near or inside the outer surface of one battery unit and/or near or inside the outer surface of the other battery unit, and the middle polar plate is an electric conductor or an electric conducting material which is arranged in the preset space between the first polar plate and the second polar plate;

or;

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

or;

further comprising an application device for applying a stimulus to the first plate, the second plate and/or the intermediate plate;

or;

when the change rate or the change value of the capacitance exceeds a preset threshold value, judging that the moisture contained between the batteries is excessive;

or;

the two sides of the middle polar plate are respectively provided with a conductor or a conductive material, and the conductors or the conductive materials on the two sides are insulated;

or;

the battery safety detection device is also used for measuring the deformation of a battery unit in the battery pack, and the comparison unit is used for comparing the change rate or the change value of the capacitance and judging the deformation position, the deformation amount, the deformation range and/or the deformation type of the battery according to the comparison result;

or;

and when the capacitance change rate or the change value is inconsistent, judging that the capacitance change is caused by the deformation.

9. A battery safety detecting device, wherein the battery safety detecting device measures moisture in a battery pack including two or more battery cells arranged at a predetermined interval, the battery safety detecting device comprising:

10. The battery safety detecting device according to claim 9, wherein a first pole plate, a second pole plate and an intermediate pole plate are disposed between each two adjacent batteries of the two or more battery units;

or;

the extending direction of the more than one first polar plates and the extending direction of the more than one middle polar plates form a preset angle, the extending direction of the more than one second polar plates and the extending direction of the more than one middle polar plates form a preset angle, and the preset angle is 90 degrees;

or;

further comprising an applying means for applying a stimulus to one or more first plate units of the two or more first plates in a time-sharing manner, to one or more second plate units of the two or more second plates in a time-sharing manner, and/or to one or more middle plates of the two or more middle plates in a time-sharing manner, the plate corresponding to the excited plate being a receiving electrode, and a change in capacitance being measured from the receiving electrode;

or;

the processing device acquires capacitance changes measured based on each first polar plate, second polar plate and/or intermediate polar plate after applying excitation to the first polar plate, the second polar plate and/or the intermediate polar plate at one time and other times, compares the capacitance changes, and judges the change of the water content in the battery pack according to the comparison result;

or;

the first polar plate and/or the second polar plate are electric conductors or electric conducting materials which are respectively arranged near the outer surface of one battery unit and/or near the outer surface of the other battery unit;

or;

the processing device obtains the capacitance change rate or change value 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 rate or change value, and judges the deformation position, deformation amount, deformation range and/or deformation type of the battery according to the comparison result;

or;

and when the capacitance change rate or the change value between each first polar plate and each middle polar plate is inconsistent, the battery unit is considered to be deformed.