Battery safety detection device and battery management system

Abstract

The present disclosure provides a battery safety detection device, the battery safety detection device measures a battery cell in a battery pack, the battery pack includes more than two battery cells, and the more than two battery cells are arranged at a predetermined interval. The present disclosure also provides a battery management system.

Description

Technical Field

[0001] The present invention relates to a battery safety detection device and a battery management system. Background Art

[0002] Lithium batteries are currently widely used in various aspects of industry and life, but there are some problems in the use of lithium batteries. For example, depending on the application environment, water vapor may form in the lithium battery pack. If there is too much water vapor, it may cause damage to the lithium battery, such as causing a short circuit in the lithium battery. In addition, lithium batteries will deform when subjected to external forces, and will also bulge after aging. When the lithium battery has the above problems, internal short circuits, fires and explosions will occur. Therefore, safety testing of lithium batteries is necessary.

[0003] Usually, the detection of water vapor in lithium batteries uses humidity sensors and the like, and the deformation detection usually uses pressure sensors and the like. However, when using these sensors, the cost will be too high, and for deformation detection, the use of pressure sensors cannot accurately determine the location, range, area, type, etc. of the deformation.

[0004] The present disclosure proposes a more effective battery deformation detection method, which can be used to detect each battery in a battery pack and make judgments based on the detection signals. Summary of the invention

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

[0006] According to one aspect of the present disclosure, a battery safety detection device is provided, wherein the battery safety detection device measures the moisture in a battery pack, wherein the battery pack includes two or more battery cells, and the two or more battery cells are arranged at a predetermined interval, and the battery safety detection device includes:

[0007] A capacitance sensing device, the capacitance sensing device comprising a first electrode plate and a second electrode plate, the first electrode plate being arranged on an outer surface, near or inside one of the adjacent battery cells, the second electrode plate being arranged on an outer surface, near or inside the other of the adjacent battery cells, wherein the first electrode plate and the second electrode plate are arranged in the predetermined space and facing each other; and

[0008] A processing device is used to process the output signal of the first electrode plate and / or the second electrode plate so as to obtain the capacitance change between the first electrode plate and the second electrode plate caused by the moisture change between the battery cells.

[0009] According to at least one embodiment of the present disclosure, a first electrode plate and a second electrode plate are disposed between every two adjacent batteries of the two or more battery units.

[0010] 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 more than two, and the more than two first electrode plates and the more than two second electrode plates are arranged in a one-to-one correspondence and constitute more than two capacitance sensing units, and the processing device respectively obtains the change capacitance respectively formed by the more than two capacitance sensing units; or

[0011] One of the first electrode plate and the second electrode plate serves as a transmitting electrode, and the other of the first electrode plate and the second electrode plate serves as a receiving electrode. The number of the first electrode plates is more than one, and the number of the second electrode plates is more than two. The processing device respectively obtains and detects that the more than two second electrode plates form variable capacitance with the more than one first electrode plate.

[0012] According to at least one embodiment of the present disclosure, the processing device includes a comparison unit, which is used to compare the respective changed capacitances and determine the change in moisture between the batteries based on the comparison result.

[0013] According to at least one embodiment of the present disclosure, the first electrode plate and / or the second electrode plate is the conductor for the one battery cell package and / or the conductor for the other battery cell package.

[0014] According to at least one embodiment of the present disclosure, the first electrode plate and / or the second electrode plate are conductors or conductive materials respectively disposed near or inside the outer surface of the one battery cell and / or disposed near or inside the outer surface of the other battery cell.

[0015] According to at least one embodiment of the present disclosure, the first electrode plate and the second electrode plate are arranged in parallel.

[0016] According to at least one embodiment of the present disclosure, an application device is further included, wherein the application device is used to apply excitation to the first electrode plate and / or the second electrode plate.

[0017] According to at least one embodiment of the present disclosure, when the change rate or change value of the variable capacitance exceeds a predetermined threshold, it is determined that there is too much moisture between the cells.

[0018] According to at least one embodiment of the present disclosure, the battery safety detection device is also used to measure the deformation of the battery cells in the battery pack, and the comparison unit is used to compare the change rate or change value of each changed capacitance, and to judge the deformation position, deformation amount, deformation range and / or deformation type of the battery based on the comparison result.

[0019] According to at least one embodiment of the present disclosure, when the change rates or change values ​​of each of the variable capacitances are consistent, it is judged that the variable capacitance is caused by moisture; when the change rates or change values ​​of each of the variable capacitances are inconsistent, it is judged that the variable capacitance is caused by the deformation.

[0020] According to one aspect of the present disclosure, a battery management system includes the battery safety detection device as described above, and the water content in the battery pack is measured by the battery safety detection device.

[0021] According to one aspect of the present disclosure, a battery safety detection device is provided, wherein the battery safety detection device measures the moisture in a battery pack, wherein the battery pack includes two or more battery cells, and the two or more battery cells are arranged at a predetermined interval, and the battery safety detection device includes:

[0022] A capacitance sensing device, the capacitance sensing device comprising a first electrode plate and a second electrode plate, wherein the first electrode plate comprises one or more first electrode plate units and the second electrode plate comprises two or more second electrode plate units, the first electrode plate is arranged on an outer surface, near an outer surface, inner surface, or near an inner surface of one battery cell of adjacent battery cells, and the second electrode plate unit is arranged on an outer surface, near an outer surface, inner surface, or near an inner surface of another battery cell of the adjacent battery cells, wherein the first electrode plate and the second electrode plate are arranged opposite to each other; and

[0023] a processing device, wherein the processing device processes the output signal of the first electrode array and / or the second electrode array to obtain the capacitance change between the first electrode array and the second electrode array caused by the moisture change between the battery cells,

[0024] According to at least one embodiment of the present disclosure, a first electrode plate and a second electrode plate are disposed between every two adjacent batteries of the two or more battery units.

[0025] According to at least one embodiment of the present disclosure, the first electrode plate and the second electrode plate are arranged in parallel.

[0026] According to at least one embodiment of the present disclosure, an extension direction of the one or more first electrode plate units and an extension direction of the two or more second electrode plate units form a predetermined angle.

[0027] According to at least one embodiment of the present disclosure, the first electrode plate and / or the second electrode plate are electrical conductors or conductive materials respectively disposed relative to the battery cells.

[0028] According to at least one embodiment of the present disclosure, it also includes an application device. When the number of first plate units of the first plate is more than two, the plate unit of one of the first plate and the second plate is used as a transmitting electrode, and the plate unit of the other of the first plate and the second plate is used as a receiving electrode. The application device is used to apply excitation to the transmitting electrode in a time-sharing manner, and the processing device respectively obtains and detects the change capacitance signals of the receiving electrodes.

[0029] According to at least one embodiment of the present disclosure, it also includes an application device. When the number of the first electrode plate unit of the first electrode plate is one, the first electrode plate or the second electrode plate unit of the second electrode plate is used as a transmitting electrode, and the second electrode plate unit of the second electrode plate or the first electrode plate is used as a receiving electrode. The application device is used to apply excitation to the transmitting electrode in a time-sharing manner, and the processing device respectively obtains and detects the change capacitance signals of the receiving electrodes.

[0030] According to at least one embodiment of the present disclosure, the processing device obtains a change in capacitance signal measured from the receiving electrode after applying excitation to the transmitting electrode at one time and at another time, and compares the change in capacitance signal to determine the change in water content in the battery pack based on the comparison result.

[0031] According to at least one embodiment of the present disclosure, when the capacitance change rate or the capacitance change value of the capacitance change signal exceeds a predetermined threshold, it is determined that the water content between the cells is excessive.

[0032] According to at least one embodiment of the present disclosure, the battery safety detection device is also used to measure the deformation of the battery cell in the battery pack, and the comparison unit is used to compare the capacitance change rate or change value of the change capacitance signal measured by the receiving electrode, and judge the deformation position, deformation amount, deformation range and / or deformation type of the battery based on the comparison result.

[0033] According to at least one embodiment of the present disclosure, when the capacitance change rate or change value of the changing capacitance signal is consistent, it is considered that the changing capacitance signal of the battery cell is caused by the change in water content; when the capacitance change rate or change value of the changing capacitance signal is inconsistent, it is considered that the changing capacitance signal of the battery cell is caused by the deformation of the battery cell.

[0034] According to one aspect of the present disclosure, a battery management system includes the battery safety detection device as described above, and the water content and / or battery deformation in the battery pack is measured by the battery safety detection device.

[0035] According to one aspect of the present disclosure, a battery safety detection device is provided, wherein the battery safety detection device measures the moisture in a battery pack, wherein the battery pack includes two or more battery cells, and the two or more battery cells are arranged at a predetermined interval, and the battery safety detection device includes:

[0036] A capacitive sensing device, the capacitive sensing device comprising a first electrode plate, a second electrode plate and an intermediate electrode plate; and

[0037] a processing device, wherein the processing device processes the output signals of the first electrode plate, the second electrode plate and / or the intermediate electrode plate to obtain the capacitance change between the first electrode plate and the intermediate electrode plate and / or between the second electrode plate and the intermediate electrode plate caused by the moisture change of the battery pack,

[0038] The first electrode plate is arranged on the outer surface, near the outer surface, inner surface, or near the inner surface of one of the adjacent battery cells, the second electrode plate is arranged on the outer surface, near the outer surface, inner surface, or near the inner surface of another of the adjacent battery cells, the intermediate electrode plate is located between the first electrode plate and the second electrode plate, and the intermediate electrode plate is arranged opposite to the first electrode plate and the second electrode plate respectively.

[0039] 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 every two adjacent batteries of the two or more battery units.

[0040] According to at least one embodiment of the present disclosure, the first electrode plate and the middle electrode plate form a first capacitive sensing unit, in which one of the first electrode plate and the middle electrode plate is used as a transmitting electrode, and the other electrode plate is used as a receiving electrode, the number of one of the transmitting electrode and the receiving electrode is more than one, and the number of the other electrode is more than two, and the processing unit respectively detects the change capacitance formed by each receiving electrode relative to each transmitting electrode; and

[0041] The second electrode plate and the middle electrode plate form a second capacitive sensing unit. In the second capacitive sensing unit, one of the second electrode plate and the middle electrode plate serves as a transmitting electrode, and the other electrode plate serves as a receiving electrode. The number of one of the transmitting electrode and the receiving electrode is more than one, and the number of the other electrode is more than two. The processing unit respectively detects the change capacitance formed by each receiving electrode relative to each transmitting electrode.

[0042] According to at least one embodiment of the present disclosure, the processing device includes a comparison unit, which is used to compare the change in capacitance obtained from each receiving electrode, and determine the change in water content between batteries based on the comparison result.

[0043] According to at least one embodiment of the present disclosure, the first electrode plate and / or the second electrode plate is the conductor for the one battery cell package and / or the conductor for the other battery cell package, and the intermediate electrode plate is a conductor or a conductive material arranged between the first electrode plate and the second electrode plate.

[0044] According to at least one embodiment of the present disclosure, the first electrode plate and / or the second electrode plate are conductors or conductive materials respectively arranged near or inside the outer surface of the one battery cell and / or arranged near or inside the outer surface of the other battery cell, and the intermediate electrode plate is a conductor or conductive material arranged in the predetermined space between the first electrode plate and the second electrode plate.

[0045] According to at least one embodiment of the present disclosure, the first electrode plate, the second electrode plate and the intermediate electrode plate are arranged in parallel.

[0046] According to at least one embodiment of the present disclosure, an application device is further included, wherein the application device is used to apply excitation to the first electrode plate, the second electrode plate and / or the intermediate electrode plate.

[0047] According to at least one embodiment of the present disclosure, when the capacitance change rate or the capacitance change value exceeds a predetermined threshold, it is determined that there is too much water between the batteries.

[0048] According to at least one embodiment of the present disclosure, electrical conductors or conductive materials are respectively disposed on both sides of the intermediate electrode, and the electrical conductors or conductive materials on both sides are insulated.

[0049] According to at least one embodiment of the present disclosure, the battery safety detection device is also used to measure the deformation of the battery cells in the battery pack, and the comparison unit is used to compare the capacitance change rate or change value, and to determine the deformation position, deformation amount, deformation range and / or deformation type of the battery based on the comparison result.

[0050] According to at least one embodiment of the present disclosure, when the capacitance change rate or change value is consistent, it is judged that the capacitance change is caused by the change in water content; when the capacitance change rate or change value is inconsistent, it is judged that the capacitance change is caused by the deformation.

[0051] According to one aspect of the present disclosure, a battery management system includes the battery safety detection device as described above, and the battery safety detection device is used to measure the change in water content and / or battery deformation in the battery pack.

[0052] According to one aspect of the present disclosure, a battery safety detection device is provided, wherein the battery safety detection device measures the moisture in a battery pack, wherein the battery pack includes two or more battery cells, and the two or more battery cells are arranged at a predetermined interval, and the battery safety detection device includes:

[0053] A capacitance sensing device, the capacitance sensing device comprising a first electrode plate, a second electrode plate and an intermediate electrode plate, wherein the first electrode plate comprises more than one first electrode plate unit, the second electrode plate comprises more than one second electrode plate and the intermediate electrode plate comprises more than one intermediate electrode plate, the first electrode plate is arranged on an outer surface, near the outer surface, inner surface, or near the inner surface of one battery cell of adjacent battery cells, the second electrode plate is arranged on an outer surface, near the outer surface, inner surface, or near the inner surface of another battery cell of the adjacent battery cells, the intermediate electrode plate is arranged between the first electrode plate and the second electrode plate, wherein the first electrode plate, the second electrode plate and the intermediate electrode plate are arranged in the predetermined space and are arranged opposite to each other; and

[0054] A processing device is provided for processing output signals of the first electrode plate, the second electrode plate and / or the intermediate electrode plate so as to obtain capacitance changes generated between the first electrode plate and the intermediate electrode plate, and / or between the second electrode plate and the intermediate electrode plate when the water content in the battery pack changes.

[0055] 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 every two adjacent batteries of the two or more battery units.

[0056] According to at least one embodiment of the present disclosure, the first electrode plate, the second electrode plate, and the intermediate electrode plate are arranged in parallel.

[0057] According to at least one embodiment of the present disclosure, the extension direction of the one or more first electrode plates forms a predetermined angle with the extension direction of the one or more intermediate electrode plates, and the extension direction of the one or more second electrode plates forms a predetermined angle with the extension direction of the one or more intermediate electrode plates, and the predetermined angle is 90 degrees.

[0058] According to at least one embodiment of the present disclosure, electrical conductors or conductive materials are respectively disposed on both sides of the intermediate electrode, and the electrical conductors or conductive materials on both sides are insulated.

[0059] According to at least one embodiment of the present disclosure, it also includes an application device, which is used to apply excitation to one or more first electrode plate units among the two or more first electrode plates in a time-sharing manner, apply excitation to one or more second electrode plate units among the two or more second electrode plates in a time-sharing manner, and / or apply excitation to one or more intermediate electrode plates in a time-sharing manner, the electrode corresponding to the excited electrode serves as a receiving electrode, and the capacitance change is measured from the receiving electrode.

[0060] According to at least one embodiment of the present disclosure, the processing device obtains the capacitance change measured based on each first electrode plate, the second electrode plate and / or the intermediate electrode plate after applying excitation to the first electrode plate, the second electrode plate and / or the intermediate electrode plate at one time and at other times, and compares the capacitance change, and determines the change in water content in the battery pack according to the comparison result.

[0061] According to at least one embodiment of the present disclosure, the first electrode plate and / or the second electrode plate are electrical conductors or conductive materials respectively disposed near an outer surface of the one battery cell and / or disposed near an outer surface of the other battery cell.

[0062] According to at least one embodiment of the present disclosure, when the capacitance change rate or the capacitance change value exceeds a predetermined threshold, it is determined that there is too much water between the batteries.

[0063] According to at least one embodiment of the present disclosure, the processing device obtains the capacitance change rate or change value measured based on each first electrode plate, the second electrode plate and / or the intermediate electrode plate after applying excitation to the first electrode plate, the second electrode plate and / or the intermediate electrode plate at one time and at other times, and compares the capacitance change rate or change value, and determines the deformation position, deformation amount, deformation range and / or deformation type of the battery according to the comparison result.

[0064] According to at least one embodiment of the present disclosure, when the capacitance change between each first electrode plate and each intermediate electrode plate, and / or the capacitance change rate or change value between each second electrode plate and each intermediate electrode plate are consistent, it is considered that the moisture between the battery cells has changed; when the capacitance change between each first electrode plate and each intermediate electrode plate, and / or the capacitance change rate or change value between each second electrode plate and each intermediate electrode plate are inconsistent, it is considered that the battery cell has been deformed.

[0065] According to one aspect of the present disclosure, a battery management system includes the battery safety detection device as described above, and the battery safety detection device is used to measure the moisture change between battery cells in the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] The accompanying drawings illustrate exemplary embodiments of the present disclosure and together with the description serve to explain the principles of the present disclosure. These drawings are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this specification.

[0067] Figure 1 A schematic diagram of a battery safety detection device according to an embodiment of the present disclosure is shown.

[0068] Figure 2 A schematic diagram of a battery safety detection device according to an embodiment of the present disclosure is shown.

[0069] Figure 3 A schematic diagram of a battery safety detection device according to an embodiment of the present disclosure is shown.

[0070] Figure 4 A schematic diagram of a battery safety detection device according to an embodiment of the present disclosure is shown.

[0071] Figure 5 A schematic diagram of a battery safety detection device according to an embodiment of the present disclosure is shown.

[0072] Figure 6 A schematic diagram of a battery safety detection device according to an embodiment of the present disclosure is shown.

[0073] Figure 7 A schematic diagram of a battery safety detection device according to an embodiment of the present disclosure is shown.

[0074] Figure 8 A schematic diagram of a processing device of a battery safety detection device according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0075] The present disclosure is further described in detail below in conjunction with the accompanying drawings and implementations. It is understood that the specific implementations described herein are only used to explain the relevant content, rather than to limit the present disclosure. It should also be noted that, for ease of description, only the parts related to the present disclosure are shown in the accompanying drawings.

[0076] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in the present disclosure can be combined with each other. The technical solution of the present disclosure will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0077] Unless otherwise specified, the exemplary embodiments / embodiments shown will be understood as providing exemplary features of various details of some ways in which the technical concept of the present disclosure can be implemented in practice. Therefore, unless otherwise specified, the features of the various embodiments / embodiments can be combined, separated, interchanged and / or rearranged without departing from the technical concept of the present disclosure.

[0078] The use of cross-hatching and / or shading in the accompanying drawings is generally used to make the boundaries between adjacent components clear. As such, unless otherwise specified, the presence or absence of cross-hatching or shading does not convey or indicate any preference or requirement for the specific materials, material properties, dimensions, proportions, commonalities between the components shown, and / or any other characteristics, attributes, properties, etc. of the components. In addition, in the accompanying drawings, the sizes and relative sizes of the components may be exaggerated for clarity and / or descriptive purposes. When the exemplary embodiments can be implemented differently, the specific process sequence can be performed in a different order than described. For example, two successively described processes can be performed substantially simultaneously or in an order opposite to the described order. In addition, the same figure numbers represent the same components.

[0079] When a component is referred to as being "on" or "over," "connected to," or "coupled to" another component, the component may be directly on, directly connected to, or directly coupled to the other component, or intervening components may be present. However, when a component is referred to as being "directly on," "directly connected to," or "directly coupled to" another component, there are no intervening components. For this purpose, the term "connected" may refer to a physical connection, an electrical connection, etc., with or without intervening components.

[0080] For descriptive purposes, the present disclosure may use spatially relative terms such as "under," "beneath," "under," "down," "over," "upper," "above," "higher," and "side (e.g., as in "sidewall")," to describe the relationship of one component to another (other) component as shown in the accompanying drawings. The spatially relative terms are intended to encompass different orientations of the device in use, operation, and / or manufacture in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, components described as "under" or "beneath" other components or features would subsequently be positioned "over" the other components or features. Thus, the exemplary term "under" can encompass both the "above" and "below" orientations. Furthermore, the device may be otherwise oriented (e.g., rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein should be interpreted accordingly.

[0081] The terms used here are for the purpose of describing specific embodiments, and are not intended to be restrictive. As used here, unless the context clearly indicates otherwise, the singular forms "one (kind, person)" and "said (the)" are also intended to include plural forms. In addition, when the terms "comprise" and / or "include" and their variations are used in this specification, it is explained that there are stated features, integral bodies, steps, operations, parts, components and / or their groups, but it is not excluded that there are or add one or more other features, integral bodies, steps, operations, parts, components and / or their groups. It should also be noted that, as used here, the terms "substantially", "approximately" and other similar terms are used as approximate terms and not as degree terms, so that they are used to explain the inherent deviations of the processed values, calculated values ​​and / or provided values ​​that will be recognized by those of ordinary skill in the art.

[0082] According to one embodiment of the present disclosure, a battery safety detection device in a battery pack is provided, wherein the battery safety detection device can measure the moisture or water content contained in the battery pack, and can also measure the deformation of the battery cells in the battery pack.

[0083] According to the technical solution of the present disclosure, a capacitor plate can be set in or near the battery pack to measure the change in water content in the battery pack / around the battery, or the battery deformation.

[0084] Figure 1 A battery safety detection device in a battery pack according to the first aspect of the present disclosure is shown.

[0085] like Figure 1 As shown, the battery pack 10 may include more than two battery cells. Figure 1 Three battery cells 110, 120 and 130 are shown, but it should be noted that other numbers of battery cells may also be used. The following description will be made by taking three battery cells as an example, and the principle is the same for other numbers of battery cells.

[0086] The three battery cells 110 , 120 , and 130 are arranged at predetermined intervals.

[0087] The battery safety detection device may include a capacitive sensing device and a processing device.

[0088] The capacitive sensing device may include a first electrode plate 210 and a second electrode plate 220, wherein the first electrode plate 210 is disposed on an outer surface, near or inside one of the adjacent battery cells, and the second electrode plate is disposed on an outer surface, near or inside another of the adjacent battery cells, wherein the first electrode plate 210 and the second electrode plate 220 are disposed in a predetermined space and are disposed opposite to each other. The first electrode plate and the second electrode plate are disposed between every two adjacent batteries of the two or more battery cells.

[0089] like Figure 1 As shown, a first electrode plate 210 may be disposed on an outer surface of the first battery 110 , and a second electrode plate 220 may be disposed on an outer surface of the second battery 120 correspondingly, a first electrode plate 210 may be disposed on an outer surface of the other side of the second battery, and a second electrode plate 220 may be disposed on an outer surface of the third battery 130 correspondingly.

[0090] The processing device 300 processes the output signal of the first electrode plate 210 and / or the second electrode plate 220 to obtain the capacitance change between the first electrode plate 210 and the second electrode plate 220 caused by moisture around the battery cell and / or deformation of the battery cell.

[0091] In various embodiments or examples of the present disclosure, when the water content of the battery cell changes, the dielectric constant between the plates changes due to the change in water content, which will correspondingly cause the sensing capacitance value between the plates to change. In this way, the capacitive sensing device of the present disclosure can effectively measure the change in water content. When the water content is too high, an alarm process can be performed.

[0092] In addition, when the water content changes, the dielectric constant caused by the water in the battery pack will change uniformly, that is, the change in the dielectric constant caused by the water in the battery pack is usually consistent throughout the battery pack.

[0093] In addition, the processing device 300 processes the output signal of the first electrode plate 210 and / or the second electrode plate 220, and can obtain the capacitance change between the first electrode plate 210 and the second electrode plate 220 generated when the distance between the first electrode plate 210 and the second electrode plate 220 changes due to the deformation of the battery cell. When the battery cell is deformed, the electrode plate will be deformed accordingly, so that the distance between the electrode plates will change, and the capacitance generated between the electrode plates will also change accordingly. Since the shape change of the electrode plate is not regular. Therefore, if there are multiple pairs of electrode plates as described below for detection, the capacitance change rate or change value formed by each pair of electrode plates will be different.

[0094] Figure 2 A three-dimensional diagram of the battery pack is given. Figure 3 A schematic diagram showing water contained in a battery pack. Figure 4 A schematic diagram of the battery after deformation is shown, where Figure 4 The deformation shown is a battery cell bulging type deformation.

[0095] In the battery pack of the present disclosure, the change in water content in the battery pack will cause the capacitance value obtained between the first electrode plate 210 and the second electrode plate 220 to change. Since the battery cell is deformed, the first electrode plate 210 and the second electrode plate 220 will be deformed. When the first electrode plate 210 and the second electrode plate 220 are deformed, the electrostatic capacitance value between the first electrode plate 210 and the second electrode plate 220 will also change. Therefore, the change in water content in the battery pack and / or the deformation of the battery cell can be obtained by measuring the change in capacitance value.

[0096] According to a further embodiment of the present disclosure, the number of the first electrode plate 210 and the second electrode plate 220 disposed on the outer surface of a battery may be more than two. The more than two first electrode plates 210 and the more than two second electrode plates 220 are disposed in one-to-one correspondence and constitute more than two capacitive sensing units, and the processing device respectively obtains the unit capacitance change values ​​respectively formed by the more than two capacitive sensing units.

[0097] Figure 5 The case where a plurality of first and second plates are provided is shown. The number of the first and second plates can be set according to actual conditions, and their shapes can be square, rectangular, circular, trapezoidal, rhombus, triangle, T-shaped, interdigital, polygonal, etc., which are not limited in the present disclosure. In other implementations / embodiments, the shape of the plate can also be the above-mentioned shape or any other shape.

[0098] By setting a plurality of first and second electrodes, the first battery cell 110 and the second battery cell 120 are used as examples for explanation. A plurality of first electrodes 210 are set on the outer surface of the first battery cell 110, and correspondingly, a plurality of second electrodes 220 are also set on the outer surface of the second battery cell 120. When the size and shape of each pair of first and second electrodes are the same, when the water content in the battery pack changes, the change in the capacitance value detected by each pair of first and second electrodes is the same (because the change in the dielectric constant caused by the water content in the battery pack is uniform), but when the size and / or shape of each pair of first and second electrodes are the same, when the water content in the battery pack changes, the change in the capacitance value detected by each pair of first and second electrodes is different. At this time, the change caused by the water content can be obtained by calculating the change rate of the capacitance value of each pair of first and second electrodes, such as the change rate of the capacitance value between the previous moment and the next moment.

[0099] When the first battery cell 110 and / or the second battery cell 120 at the position where the first electrode plate 210 and the second electrode plate 220 are located are deformed, the static capacitance value generated by the first electrode plate 210 and the second electrode plate 220 will change, so the deformation of the first battery cell 110 and / or the second battery cell 120 is obtained by detecting the static capacitance value. Since different first and second electrodes are arranged at different positions, the static capacitance values ​​generated by each corresponding first and second electrode plate may be different. For example, when a bulging type fault occurs, the static capacitance of the first and second electrodes at the bulging position changes greatly, while the static capacitance of the first and second electrodes at the non-bulging position changes less. In this way, the position of the deformation, the range of the deformation, the type of deformation and the amount of deformation can be obtained according to the setting position of the first and second electrodes.

[0100] Preferably, the first electrode plate and the second electrode plate are arranged in parallel.

[0101] For example, the processing device of the present disclosure may further include a comparison unit, which is used to compare the capacitance change value and / or change rate of each unit (each corresponding unit composed of the first electrode plate and the second electrode plate), and judge the change of the water content in the battery pack according to the comparison result. The comparison unit can also judge the deformation position, deformation amount, deformation range and / or deformation type of the battery according to the capacitance change value and / or change rate.

[0102] In addition, it is also possible to determine whether the capacitance change is caused by a change in water content or by a deformation of the battery cell based on the capacitance change value and / or change rate. Figure 4 In the case of a bulge-type fault of the shape shown, the change value and / or change rate of the electrostatic capacitance of the two middle first plates 210 and the second plates 220 will be significantly different from the change value and / or change rate of the electrostatic capacitance of the two first plates 210 and the second plates 220 on both sides, so that by detecting the change value and / or change rate of the electrostatic capacitance of the detection unit composed of each first plate 210 and the second plate 220, the position where the deformation occurs can be obtained, and the type of deformation can also be obtained through the deformation position. For example, when the water content changes, the change value and / or change rate of the electrostatic capacitance of each unit is roughly consistent / equal, so it can be considered that the capacitance change is caused by the change in water content.

[0103] In one embodiment of the present disclosure, the conductor used for the external packaging of each battery cell can be used as the first electrode plate and the second electrode plate. For example, the battery cell is usually wrapped with aluminum foil, and the aluminum foil used for wrapping can be used as the first electrode plate and the second electrode plate. In addition, an insulating layer can be provided between the aluminum foil and the battery body.

[0104] According to another embodiment of the present disclosure, the first electrode plate and / or the second electrode plate are conductors or conductive materials respectively arranged on the outer surface or near the outer surface of one battery cell and / or arranged on the outer surface or near the outer surface of another battery cell, and may also be arranged near the inner surface or on the inner surface. For example, a conductor may be separately arranged as the first electrode plate and the second electrode plate, or a conductive material (e.g., a conductive material coating) may be arranged to realize the functions of the first electrode plate and the second electrode plate, etc.

[0105] The battery safety detection device may further include an application device for applying an excitation to the first electrode plate and / or the second electrode plate. It may also include a threshold comparison unit, which determines that the battery is faulty (excessive water content or excessive deformation, etc.) when the capacitance change value and / or change rate exceeds a predetermined threshold.

[0106] According to another aspect of the present disclosure, a battery management system is provided, including the battery safety detection device as described above, and the water content and / or deformation of the battery cells in the battery pack are measured by the battery safety detection device.

[0107] According to a second aspect of the present disclosure, a battery safety detection device in a battery pack is provided, the battery pack includes more than two battery cells, the more than two battery cells are arranged at a predetermined space, the battery safety detection device includes: a capacitance sensing device, the capacitance sensing device includes a first electrode array and a second electrode array; and a processing device, the processing device processes the output signal of the first electrode array and / or the second electrode array, so as to obtain the capacitance change between the first electrode array and the second electrode array generated when the water content in the battery pack changes, wherein the first electrode array includes more than two first electrodes and the second electrode array includes more than two second electrodes, the extension direction of the more than two first electrodes is at a predetermined angle to the extension direction of the more than two second electrodes, the first electrode array is arranged on the outer surface, near or inside of one of the adjacent battery cells, and the second electrode array is arranged on the outer surface, near or inside of another of the adjacent battery cells, wherein the first electrode array and the second electrode array are arranged in a predetermined space and are arranged opposite to each other. The predetermined angle can be 90 degrees.

[0108] A first electrode plate array and a second electrode plate array are arranged between every two adjacent batteries of more than two battery units. The first electrode plate array and the second electrode plate array can be arranged in parallel.

[0109] The following description takes two battery cells as an example. Figure 6 A schematic diagram of the arrangement of the first electrode plate and the second electrode plate of the first battery unit and the second battery unit is shown.

[0110] like Figure 6As shown, the first electrode plate 210 arranged in the first electrode plate array of the first battery cell 110 can extend along the first direction and can be arranged in parallel with a plurality of them, and the second electrode plate 220 arranged in the second electrode plate array of the second battery cell 120 can extend along the second direction and can also be arranged in parallel with a plurality of them. In this way, when the first electrode plate 210 and the second electrode plate 220 are arranged opposite to each other, the change in water content of the battery pack and / or the deformation of the battery cell can be sensed by the capacitance value generated between the first electrode plate 210 and the second electrode plate 220. It should be noted that although in Figure 6 In the figure, the first electrode plate 210 and the second electrode plate 220 are configured as long strips, but they may also adopt other shapes, which are not limited in the present disclosure.

[0111] The battery safety detection device may also include an application device, which is used to apply excitation to one or more of the two or more first plates in a time-sharing manner, and / or to one or more of the two or more second plates in a time-sharing manner.

[0112] For example, an excitation voltage is applied to a first electrode plate 210 at a first time, and then the electrostatic capacitance value between the first electrode plate and the second electrode plate is measured. Then, an excitation voltage is applied to another first electrode plate, and the electrostatic capacitance value between the first electrode plate and the second electrode plate is measured, and so on.

[0113] In this way, the electrostatic capacitance value between the first electrode plate and the second electrode plate obtained after the excitation voltage is applied to each first electrode plate can be finally obtained.

[0114] The processing device obtains the capacitance change measured based on each first electrode plate and / or second electrode plate after applying excitation to the first electrode plate and / or the second electrode plate at one time and at another time, and compares the capacitance change value and / or the change rate, and determines the water content change of the battery and / or the deformation position, deformation amount, deformation range and / or deformation type of the battery cell according to the comparison result.

[0115] For example, when the water content in the battery pack changes, the change value and / or change rate of the electrostatic capacitance measured by each plate are roughly consistent / equal, so the change can be considered to be caused by the change in water content. Figure 3 In the case of a bulge-type fault of the shape shown, the change value and / or change rate of the electrostatic capacitance of the first electrode 210 and the second electrode 220 at the bulge will be greater than the change value and / or change rate of the electrostatic capacitance of the two first electrode plates 210 and the second electrode plates 220 on both sides. In this way, by detecting the change value and / or change rate of the electrostatic capacitance of the detection unit composed of each first electrode plate 210 and the second electrode plate 220, the position where the deformation occurs can be obtained, and the deformation type can also be obtained through the deformation position.

[0116] In one embodiment of the present disclosure, the conductor used for the external packaging of each battery cell can be used as the first electrode plate and the second electrode plate. For example, the battery cell is usually wrapped with aluminum foil, and the aluminum foil used for packaging can be used as the first electrode plate and the second electrode plate. In addition, an insulating layer can be provided between the aluminum foil and the battery body. In this case, the aluminum foil used for packaging can be processed to form each first electrode plate and the second electrode plate.

[0117] According to another embodiment of the present disclosure, the first electrode plate and / or the second electrode plate are conductors or conductive materials respectively arranged on the outer surface or near the outer surface of one battery cell and / or arranged on the outer surface or near the outer surface of another battery cell, and may also be arranged on the inner surface or near the inner surface. For example, a conductor may be separately arranged as the first electrode plate and the second electrode plate, or a conductive material (e.g., a conductive material coating) may be arranged to realize the functions of the first electrode plate and the second electrode plate, etc.

[0118] In addition, when the capacitance change exceeds a predetermined threshold, it is determined that the battery has excessive water content or excessive deformation. For example, as can be seen above, the capacitance sensing device according to the present disclosure can effectively distinguish the change in water content and the change in shape, so that after the distinction, it can be determined whether the battery has a water content problem or a deformation problem.

[0119] According to a further embodiment of the present disclosure, a battery management system is also provided, comprising the battery safety detection device as described above, and the water content and / or deformation of the battery cells in the battery pack are measured by the battery safety detection device.

[0120] According to a third aspect of the present disclosure, a battery safety detection device in a battery pack is provided, the battery pack includes more than two battery cells, the more than two battery cells are arranged at a predetermined interval, the battery safety detection device includes: a capacitance sensing device, the capacitance sensing device includes a first electrode plate, a second electrode plate and an intermediate electrode plate; and a processing device, the processing device processes output signals of the first electrode plate, the second electrode plate and / or the intermediate electrode plate to obtain capacitance changes between the first electrode plate and the intermediate electrode plate, and / or between the second electrode plate and the intermediate electrode plate generated when the distance between the first electrode plate and the intermediate electrode plate, and / or between the second electrode plate and the intermediate electrode plate changes due to changes in water content inside the battery pack and / or deformation of the battery cells, wherein the first electrode plate is arranged on, near or inside an outer surface of a battery cell of the adjacent battery cells, the second electrode plate is arranged on, near or inside an outer surface of another battery cell of the adjacent battery cells, the intermediate electrode plate is located between the first electrode plate and the second electrode plate, and the intermediate electrode plate is arranged opposite to the first electrode plate and the second electrode plate in the predetermined space, respectively.

[0121] A first electrode plate, a second electrode plate and an intermediate electrode plate are arranged between every two adjacent batteries of the two or more battery units.

[0122] like Figure 7 As shown, an intermediate electrode plate 230 is provided between the first electrode plate 210 and the second electrode plate 220. The change in the water content inside the battery pack and / or the deformation of the first battery cell 110 can be known through the change in capacitance between the intermediate electrode plate 230 and the first electrode plate 210, and the change in the water content inside the battery pack and / or the deformation of the second battery cell 120 can be known through the change in capacitance between the intermediate electrode plate 230 and the second electrode plate 220. For other battery cells, the principle is the same and will not be repeated.

[0123] In one embodiment of the present disclosure, the conductor used for the external packaging of each battery cell can be used as the first electrode plate and the second electrode plate. For example, the battery cell is usually wrapped with aluminum foil, and the aluminum foil used for packaging can be used as the first electrode plate and the second electrode plate. In addition, an insulating layer can be provided between the aluminum foil and the battery body. In this case, the aluminum foil used for packaging can be processed to form each first electrode plate and the second electrode plate.

[0124] According to another embodiment of the present disclosure, the first electrode plate and / or the second electrode plate are conductors or conductive materials respectively arranged on the outer surface or near the outer surface of one battery cell and / or arranged on the outer surface or near the outer surface of another battery cell, and may also be arranged on the inner surface or near it. For example, a conductor may be separately arranged as the first electrode plate and the second electrode plate, or a conductive material may be arranged to realize the functions of the first electrode plate and the second electrode plate, etc.

[0125] The intermediate plate may be a whole conductor, or a conductor / conductive material may be provided on both sides of the intermediate plate. When it is a whole conductor, the change in water content inside the battery pack, and / or the deformation of the first battery cell 110 and the deformation of the second battery cell 120 may be obtained by detecting the capacitance change between the intermediate plate and the first plate, and the capacitance change between the intermediate plate and the second plate, respectively. When a conductor / conductive material is provided on both sides of the intermediate plate, the change in water content inside the battery pack, and / or the deformation of the first battery cell 110, may be measured by the conductor / conductive material on the opposite side of the intermediate plate corresponding to the first plate, and the change in water content inside the battery pack, and / or the deformation of the second battery cell 120 may be measured by the conductor / conductive material on the opposite side of the intermediate plate corresponding to the second plate. When a conductor or conductive material is provided on both sides of the intermediate plate, the conductors or conductive materials on both sides are insulated.

[0126] and Figure 5Similar to the embodiment shown, the number of the first electrode plate, the second electrode plate and the intermediate electrode plate is respectively more than two, and the more than two first electrode plates are arranged in a one-to-one correspondence with the more than two intermediate electrode plates and constitute more than two first capacitance sensing units, and the more than two second electrode plates are arranged in a one-to-one correspondence with the more than two intermediate electrode plates and constitute more than two second capacitance sensing units, and the processing device respectively obtains the unit capacitance change values ​​and / or change rates respectively formed by the more than two first capacitance sensing units and the more than two second capacitance sensing units.

[0127] The processing device includes a comparison unit, which is used to compare the capacitance change value and / or change rate of each unit, and judge the change of water content inside the battery pack and / or the deformation position, deformation amount, deformation range and / or deformation type of the battery according to the comparison result.

[0128] Similarly, the first electrode plate and / or the second electrode plate is a conductor for packaging one battery cell and / or another battery cell, and the intermediate electrode plate is a conductor or conductive material disposed between the first electrode plate and the second electrode plate. Alternatively, the first electrode plate and / or the second electrode plate are conductors or conductive materials disposed near the outer surface of one battery cell and / or disposed near the outer surface of another battery cell, respectively, and the intermediate electrode plate is a conductor or conductive material disposed between the first electrode plate and the second electrode plate.

[0129] The first electrode plate, the second electrode plate and the middle electrode plate are arranged in parallel.

[0130] The battery also includes an application device for applying an excitation to the first electrode plate, the second electrode plate and / or the intermediate electrode plate. When the capacitance change exceeds a predetermined threshold, it is determined that the battery has excessive water content or excessive deformation.

[0131] According to a further embodiment of the present disclosure, a battery management system is also provided, including the battery safety detection device as described above, and the battery safety detection device is used to measure the deformation of the battery cells in the battery pack and the water content inside the battery pack.

[0132] According to a fourth aspect of the present disclosure, a battery safety detection device in a battery pack is provided, the battery pack includes more than two battery cells, the more than two battery cells are arranged at a predetermined interval, the battery safety detection device includes: a capacitance sensing device, the capacitance sensing device includes a first electrode plate array, a second electrode plate array and an intermediate electrode plate array; and a processing device, the processing device processes the output signals of the first electrode plate array, the second electrode plate array and / or the intermediate electrode plate array to obtain the capacitance change generated by the change of water content inside the battery pack, and / or the capacitance change generated by the change of distance between the first electrode plate array and the intermediate electrode plate array, and / or between the second electrode plate array and the intermediate electrode plate array caused by deformation of the battery cell, wherein the first electrode plate array includes two More than one first electrode plate, a second electrode plate array includes more than two second electrode plates, and an intermediate electrode plate array includes more than two intermediate electrode plates, the extension direction of the two or more first electrode plates forms a predetermined angle with the extension direction of the two or more intermediate electrode plates, the extension direction of the two or more second electrode plates forms a predetermined angle with the extension direction of the two or more intermediate electrode plates, the first electrode plate array is arranged on the outer surface or near or the inner surface or near one of the adjacent battery cells, the second electrode plate array is arranged on the outer surface or near or the inner surface or near another battery cell of the adjacent battery cells, and the intermediate electrode plate array is arranged 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 arranged in a predetermined space and are arranged opposite to each other.

[0133] A first electrode array, a second electrode array and an intermediate electrode array are arranged between every two adjacent batteries of more than two battery units. The first electrode array, the second electrode array and the intermediate electrode array are arranged in parallel. The predetermined angle is 90 degrees.

[0134] Conductors or conductive materials are respectively arranged on both sides of the intermediate plate array, and the conductors or conductive materials on both sides are insulated.

[0135] It also includes an application device, which is used to apply excitation to one or more of the two or more first pole plates at a time-sharing basis, to one or more of the two or more second pole plates at a time-sharing basis, and / or to one or more of the two or more intermediate pole plates at a time-sharing basis.

[0136] The processing device obtains the capacitance change value and / or capacitance change rate measured based on each first electrode plate, the second electrode plate and / or the intermediate electrode plate after applying excitation to the first electrode plate, the second electrode plate and / or the intermediate electrode plate at one time and at other times, and compares the capacitance change value and / or the capacitance change rate, and determines the change in water content inside the battery pack and / or the deformation position, deformation amount, deformation range and / or deformation type of the battery according to the comparison result.

[0137] The first electrode plate and / or the second electrode plate are electrical conductors or conductive materials respectively disposed near an outer surface of one battery cell and / or disposed near an outer surface of another battery cell.

[0138] When the capacitance change exceeds a predetermined threshold, it is determined that the battery has excessive water content or excessive deformation.

[0139] When the capacitance change value and / or capacitance change rate between each first electrode plate and each intermediate electrode plate, and / or the capacitance change value and / or capacitance change rate between each second electrode plate and each intermediate electrode plate are consistent, it is considered that the water content inside the battery pack has changed. When the capacitance change value and / or capacitance change rate between each first electrode plate and each intermediate electrode plate, and / or the capacitance change value and / or capacitance change rate between each second electrode plate and each intermediate electrode plate are inconsistent, it is considered that the shape of the battery cell has changed.

[0140] The technical solution of the fourth aspect of the present disclosure is Figure 6 The example is different in that it further includes an intermediate electrode array, and the intermediate electrode can include a plurality of strip-shaped intermediate electrodes.

[0141] For example, a plurality of first plates may extend in parallel along a first direction, a plurality of second plates may extend in parallel along the first direction, and a plurality of intermediate plates may extend in a second direction at a certain angle to the first direction, for example, the certain angle may be 90 degrees, wherein the intermediate plates may also be arranged on both sides so as to correspond to the first plates and the second plates respectively. The measurement method thereof may also be similar to the technical solution of the second aspect, and will not be described in detail here.

[0142] According to a further embodiment of the present disclosure, a battery management system is provided, comprising the battery safety detection device as described above, and the battery safety detection device is used to measure the deformation of the battery cells in the battery pack and / or the water content inside the battery panel.

[0143] Figure 8 A schematic diagram of a processing device according to an embodiment of the present disclosure is shown, wherein the processing device may include an application unit, which may provide a square wave voltage, a step wave voltage, etc. of a predetermined Hz, and a sampling unit may receive a signal from the plate, and the received signal may be provided to an analog-to-digital conversion unit, which may be provided to a filtering unit, etc. after conversion by the analog-to-digital conversion unit, so that the corresponding capacitance change value may be measured. In addition, when a processing device is used to process multiple plates, a multiplexing unit may be provided before the sampling unit, for example, a multi-way selection switch may be used to select the signal of each plate to be measured.

[0144] like Figure 8As shown, the applying unit can apply excitation to the plate. In addition, when it is necessary to apply excitation to multiple plates separately, the applying unit can selectively apply excitation to the plate through the multiplexing unit. After applying the excitation, the capacitance value generated by the plate can be sampled by the sampling unit (when multiple plates are sampled separately, each plate can be selected separately by the multiplexing unit to sample the plate), and the capacitance value collected by the sampling unit is sent to the analog-to-digital conversion unit, and the analog-to-digital conversion unit can convert the collected capacitance value into a digital signal, and then filter it through the filtering unit. The filtering unit may include a linear filter, a nonlinear filter, or a combination filter of a linear filter and a nonlinear filter. The filtered signal is sent to the calculation unit, and the calculation unit calculates the capacitance change value and / or capacitance change rate generated by the plate. The calculated capacitance change value and / or capacitance change rate is sent to the judgment unit, and the judgment unit makes a judgment based on the capacitance change value and / or capacitance change rate. For example, it can judge whether the capacitance change is caused by a change in water content or battery deformation based on the capacitance change value and / or capacitance change rate. In addition, the judgment unit can also judge whether a fault occurs based on the capacitance change value and / or capacitance change rate to issue an alarm, etc.

[0145] In a preferred embodiment of the present disclosure, in the case of including multiple first pole plates, insulating materials or insulating components may be provided between the multiple first pole plates to prevent short circuits between the first pole plates when the battery cell is deformed. In addition, similarly, in the case of including multiple second pole plates / intermediate pole plates, each second pole plate / intermediate pole plate may also be provided with insulating materials or insulating components to prevent short circuits after deformation. In addition, insulating materials or insulating components may also be provided between the first pole plate and the second pole plate, between the first pole plate and the intermediate pole plate, and / or between the second pole plate and the intermediate pole plate. When providing the insulating material or insulating component as described above, the insulating material or insulating component may be provided between the two pole plates, or the surface of each pole plate may be wrapped with the insulating material or insulating component.

[0146] In addition, in the above implementation modes / examples, the first electrode plate / the second electrode plate is arranged on the outer surface of the battery cell for explanation, but the first electrode plate / the second electrode plate may also be arranged inside the outer surface of the battery cell, for example, inside the outer packaging of the battery cell, etc.

[0147] In the above description, the water content can be measured based on the capacitance change value and / or change rate, and the deformation position, deformation amount, deformation range and / or deformation type of the battery can also be determined. For example, in the case where multiple first plates, second plates or intermediate plates are provided, the range of deformation is determined by the signals of plates provided at different positions. For example, when the signals of plates at certain positions change, the range of deformation can be determined. In addition, the same method can be used to determine the area where deformation occurs. In addition, the deformation amount of the battery cell can also be obtained based on the size of the capacitance change.

[0148] In addition, according to a modified embodiment of the present disclosure, when the number of the first electrode plate, the second electrode plate and the intermediate electrode plate is more than one, they can be configured to detect changes in water content and / or deformation.

[0149] For example, when there are more than one first electrode plate and second electrode plate, the number of first electrode plates can be set to M, M≥1, and the number of second electrode plates can be set to N, N≥2, wherein each of the M first electrode plates acts on each of the N second electrode plates respectively, thereby measuring the corresponding capacitance change. For example, when there are two first electrode plates and the two first electrode plates are used as transmitting electrodes and three second electrode plates are used as receiving electrodes, one of the two first electrode plates is excited, and the induced capacitance formed at the three second electrode plates is measured respectively, and then the other first electrode plate is excited, and the induced capacitance formed at the three second electrode plates is measured respectively. The same principle is used for the case where there are more than one first electrode plate, second electrode plate and intermediate electrode plate. For example, the number of first electrode plates can be set to M, M≥2, the number of second electrode plates can be set to N, N≥2, and the number of intermediate electrode plates can be set to m, wherein m≥1, wherein each of the m intermediate electrode plates acts on each of the M first electrode plates and the N second electrode plates respectively, thereby measuring the corresponding capacitance change.

[0150] In addition, when the electrodes are arranged on both sides of the middle electrode, the middle parts of the electrodes on both sides of the middle electrode can be arranged to be electric field insulated.

[0151] In the description of this specification, the description with reference to the terms "one embodiment / method", "some embodiments / methods", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment / method or example are included in at least one embodiment / method or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment / method or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments / methods or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments / methods or examples described in this specification and the features of the different embodiments / methods or examples, unless they are contradictory.

[0152] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0153] Those skilled in the art should understand that the above embodiments are only for the purpose of clearly illustrating the present disclosure, and are not intended to limit the scope of the present disclosure. For those skilled in the art, other changes or modifications may be made based on the above disclosure, and these changes or modifications are still within the scope of the present disclosure.

Claims

1. A battery safety detection device, characterized in that: The battery safety detection device measures the moisture in a battery pack, wherein the battery pack includes two or more battery cells, and the two or more battery cells are arranged at a predetermined interval. The battery safety detection device includes: A capacitance sensing device, the capacitance sensing device comprising a first electrode plate and a second electrode plate, each two adjacent battery cells of more than two battery cells are provided with the first electrode plate and the second electrode plate, the first electrode plate and the second electrode plate are arranged in parallel, the first electrode plate is arranged on the outer surface of one battery cell of the adjacent battery cells, and the second electrode plate is arranged on the outer surface of the other battery cell of the adjacent battery cells, wherein the first electrode plate and the second electrode plate are arranged in the predetermined space and opposite to each other, and the first electrode plate and the second electrode plate of the adjacent battery cells constitute a pair of electrode plates; and a processing device, wherein the processing device processes the output signals of the first electrode plate and the second electrode plate to obtain a capacitance change between the first electrode plate and the second electrode plate caused by a moisture change between the battery cells, The processing device calculates the capacitance change rate of each pair of first and second plates from the previous moment to the next moment to determine whether the moisture between the battery cells changes, and calculates the static capacitance value of each pair of first and second plates to determine whether the battery cells change in shape.

2. The battery safety detection device according to claim 1, characterized in that: The number of the first electrode plates and the number of the second electrode plates are respectively more than two, and the more than two first electrode plates and the more than two second electrode plates are arranged in a one-to-one correspondence and constitute more than two capacitance sensing units, and the processing device respectively obtains the change capacitance respectively formed by the more than two capacitance sensing units; or One of the first electrode plate and the second electrode plate serves as a transmitting electrode, and the other of the first electrode plate and the second electrode plate serves as a receiving electrode. The number of the first electrode plates is more than one, and the number of the second electrode plates is more than two. The processing device respectively obtains and detects that the more than two second electrode plates form variable capacitance with the more than one first electrode plate.

3. The battery safety detection device according to claim 2, characterized in that: The processing device includes a comparison unit, which is used to compare the various changed capacitances and determine the change in moisture between batteries based on the comparison result.

4. The battery safety detection device according to any one of claims 1 to 3, characterized in that: The first electrode plate and the second electrode plate are the one battery cell packaging conductor and the other battery cell packaging conductor, respectively.

5. The battery safety detection device according to any one of claims 1 to 3, characterized in that: The first electrode plate and the second electrode plate are conductors or conductive materials respectively disposed on the outer surface of one battery cell and the outer surface of another battery cell.

6. The battery safety detection device according to any one of claims 1 to 3, characterized in that: Also included is an application device, which is used to apply excitation to the first electrode plate and the second electrode plate.

7. The battery safety detection device according to claim 2, characterized in that: When the capacitance value change rate of the variable capacitor exceeds a predetermined threshold, it is determined that there is too much water between the batteries.

8. The battery safety detection device according to claim 3, characterized in that: The comparison unit is used to compare the change values ​​of each change capacitance, and determine the deformation position, deformation amount, deformation range and deformation type of the battery according to the comparison result.

9. The battery safety detection device according to claim 8, characterized in that: When the capacitance value change rates of the variable capacitors are consistent, it is determined that the variable capacitor is caused by moisture; when the capacitance value change rates of the variable capacitors are inconsistent, it is determined that the variable capacitor is caused by the deformation.

10. A battery management system, characterized in that: The invention comprises a battery safety detection device as claimed in any one of claims 1 to 9, wherein the water content in the battery pack is measured by the battery safety detection device.

11. A battery safety detection device, characterized in that: The battery safety detection device measures the moisture in a battery pack, wherein the battery pack includes two or more battery cells, and the two or more battery cells are arranged at a predetermined interval. The battery safety detection device includes: A capacitive sensing device, the capacitive sensing device comprising a first electrode plate, a second electrode plate and an intermediate electrode plate, wherein the first electrode plate, the second electrode plate and the intermediate electrode plate are arranged between every two adjacent batteries of more than two battery cells, and the first electrode plate, the second electrode plate and the intermediate electrode plate are arranged in parallel; and a processing device, wherein the processing device processes the output signals of the first electrode plate, the second electrode plate and the intermediate electrode plate to obtain the capacitance changes between the first electrode plate and the intermediate electrode plate and between the second electrode plate and the intermediate electrode plate caused by the moisture change of the battery pack, The first electrode plate is arranged on the outer surface of one of the adjacent battery cells, the second electrode plate is arranged on the outer surface of the other of the adjacent battery cells, the intermediate electrode plate is located between the first electrode plate and the second electrode plate, and the intermediate electrode plate is arranged opposite to the first electrode plate and the second electrode plate respectively. The processing device calculates the capacitance change rate between the previous moment and the next moment of each pair of first electrode plates and intermediate electrode plates and each pair of second electrode plates and intermediate electrode plates to determine whether the moisture between the battery cells changes, and calculates the static capacitance value of each pair of first electrode plates and intermediate electrode plates and each pair of second electrode plates and intermediate electrode plates to determine whether the battery cells change in shape.

12. The battery safety detection device according to claim 11, characterized in that: The first electrode plate and the middle electrode plate form a first capacitance sensing unit, in which one of the first electrode plate and the middle electrode plate is used as a transmitting electrode, and the other electrode plate is used as a receiving electrode, the number of one of the transmitting electrode and the receiving electrode is more than one, and the number of the other electrode is more than two, and the processing device detects the change capacitance formed by each receiving electrode relative to each transmitting electrode respectively; and The second electrode plate and the middle electrode plate form a second capacitive sensing unit. In the second capacitive sensing unit, one of the second electrode plate and the middle electrode plate serves as a transmitting electrode, and the other electrode plate serves as a receiving electrode. The number of one of the transmitting electrode and the receiving electrode is more than one, and the number of the other electrode is more than two. The processing device respectively detects the change capacitance formed by each receiving electrode relative to each transmitting electrode.

13. The battery safety detection device according to claim 11, characterized in that: The processing device includes a comparison unit, which is used to compare the change capacitance obtained from each receiving electrode and determine the change of water content between batteries according to the comparison result.

14. The battery safety detection device according to claim 11 or 12, characterized in that: The first electrode plate and the second electrode plate are respectively a conductor for packaging the one battery cell and a conductor for packaging the other battery cell, and the intermediate electrode plate is a conductor or a conductive material disposed between the first electrode plate and the second electrode plate.

15. The battery safety detection device according to claim 11 or 12, characterized in that: The first electrode plate and the second electrode plate are conductors or conductive materials respectively arranged on the outer surface of the one battery cell and the outer surface of the other battery cell, and the intermediate electrode plate is a conductor or conductive material arranged in the predetermined space between the first electrode plate and the second electrode plate.

16. The battery safety detection device according to claim 11 or 12, characterized in that: Also included is an application device, which is used to apply excitation to the first electrode plate, the second electrode plate and the middle electrode plate.

17. The battery safety detection device according to claim 11 or 12, characterized in that: When the capacitance value change rate exceeds a predetermined threshold, it is determined that there is too much water between the cells.

18. The battery safety detection device according to claim 13, characterized in that: The battery safety detection device is also used to measure the deformation of the battery cells in the battery pack, and the comparison unit is used to compare the capacitance change values, and determine the deformation position, deformation amount, deformation range and deformation type of the battery according to the comparison result.

19. The battery safety detection device according to claim 18, characterized in that: When the capacitance value change rates are consistent, it is determined that the capacitance change is caused by the change in water content. When the capacitance value change rates are inconsistent, it is determined that the capacitance change is caused by the deformation.

20. A battery management system, characterized in that: Comprising a battery safety detection device as described in any one of claims 11 to 19, the battery safety detection device is used to measure the change in water content and battery deformation in the battery pack.

21. A battery safety detection device, characterized in that: The battery safety detection device measures the moisture in a battery pack, wherein the battery pack includes two or more battery cells, and the two or more battery cells are arranged at a predetermined interval. The battery safety detection device includes: A capacitive sensing device, the capacitive sensing device comprising a first electrode plate, a second electrode plate and an intermediate electrode plate, wherein the first electrode plate, the second electrode plate and the intermediate electrode plate are arranged between every two adjacent batteries of more than two battery cells, and the first electrode plate, the second electrode plate and the intermediate electrode plate are arranged in parallel, wherein the first electrode plate comprises more than one first electrode plate, the second electrode plate comprises more than one second electrode plate, and the intermediate electrode plate comprises more than one intermediate electrode plate, the first electrode plate is arranged on the outer surface of one battery cell of the adjacent battery cells, the second electrode plate is arranged on the outer surface of another battery cell of the adjacent battery cells, and the intermediate electrode plate is arranged between the first electrode plate and the second electrode plate, wherein the first electrode plate, the second electrode plate and the intermediate electrode plate are arranged in the predetermined space and are arranged opposite to each other; and a processing device, wherein the processing device processes the output signals of the first electrode plate, the second electrode plate and the intermediate electrode plate to obtain the capacitance changes generated between the first electrode plate and the intermediate electrode plate, and between the second electrode plate and the intermediate electrode plate caused by the change of the water content in the battery pack, The processing device calculates the capacitance change rate between the previous moment and the next moment of each pair of first electrode plates and intermediate electrode plates and each pair of second electrode plates and intermediate electrode plates to determine whether the moisture between the battery cells changes, and calculates the static capacitance value of each pair of first electrode plates and intermediate electrode plates and each pair of second electrode plates and intermediate electrode plates to determine whether the battery cells change in shape.

22. The battery safety detection device according to claim 21, characterized in that: The extension direction of the one or more first electrode plates forms a predetermined angle with the extension direction of the one or more intermediate electrode plates, and the extension direction of the one or more second electrode plates forms a predetermined angle with the extension direction of the one or more intermediate electrode plates, and the predetermined angle is 90 degrees.

23. The battery safety detection device according to claim 22, characterized in that: It also includes an application device, which is used to apply excitation to one or more of the two or more first electrode plates, to one or more of the two or more second electrode plates, and to one or more of the two or more intermediate electrode plates at different times, the electrode plate corresponding to the excited electrode serves as a receiving electrode, and the capacitance change is measured from the receiving electrode.

24. The battery safety detection device according to claim 23, characterized in that: The processing device obtains capacitance changes measured based on each first electrode plate, second electrode plate and intermediate electrode plate after applying excitation to the first electrode plate, second electrode plate and intermediate electrode plate at one time and at another time, and compares the capacitance changes, and determines the change of water content in the battery pack according to the comparison result.

25. The battery safety detection device according to claim 22, characterized in that: The first electrode plate and the second electrode plate are conductors or conductive materials respectively disposed on the outer surface of the one battery cell and the outer surface of the other battery cell.

26. The battery safety detection device according to claim 22, characterized in that: When the capacitance value change rate exceeds a predetermined threshold, it is determined that there is too much water between the cells.

27. The battery safety detection device according to claim 23, characterized in that: The processing device obtains static capacitance values ​​measured based on each first electrode plate, second electrode plate and intermediate electrode plate after applying excitation to the first electrode plate, second electrode plate and intermediate electrode plate at one time and at other times, and compares the static capacitance values, and determines the deformation position, deformation amount, deformation range and deformation type of the battery according to the comparison result.

28. A battery management system, characterized in that: It comprises a battery safety detection device as described in any one of claims 21 to 27, and the battery safety detection device is used to measure the moisture change between battery cells in the battery pack.

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