Battery management chip and battery management system

Abstract

The present disclosure provides a battery management chip for detecting battery safety, comprising: a sampling unit for collecting battery signals; and a data processing unit for processing the signals collected by the sampling unit to detect battery safety. The present disclosure also provides a battery management system.

Description

Technical Field

[0001] The present disclosure relates to a battery management chip and a battery management system. Background Art

[0002] Lithium batteries are currently widely used in various aspects of industry and daily life. However, their use presents certain challenges. For example, depending on the application environment, water vapor may form in the battery pack. Excessive water vapor can damage the battery, potentially causing a short circuit. Furthermore, lithium batteries deform when subjected to external forces and develop bulges as they age. These issues can lead to internal short circuits, fires, and explosions. Therefore, lithium battery safety testing is essential.

[0003] Typically, moisture in lithium batteries is detected using humidity sensors, and deformation detection typically uses pressure sensors. However, these sensors are expensive, and pressure sensors cannot accurately determine the location, range, area, or type of deformation.

[0004] The present disclosure proposes a more effective battery management chip, 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 management chip and a battery management system.

[0006] According to one aspect of the present disclosure, a battery management chip is provided, which is used to detect changes in the shape of a battery and / or changes in the water content around the battery, including:

[0007] a sampling unit configured to collect a sensing capacitance signal output by a capacitance sensing device for measuring a change in shape of the battery and / or a change in water content around the battery, wherein the sensing capacitance signal will change when the shape of the battery changes or the water content around the battery changes; and

[0008] A data processing unit is used to process the inductive capacitance signal collected by the sampling unit so as to obtain the shape change of the battery and / or the water content change around the battery through the inductive capacitance signal.

[0009] According to at least one embodiment of the present disclosure, the data processing unit includes:

[0010] an analog-to-digital conversion unit, configured to convert the analog signal collected by the sampling unit into a digital signal; and

[0011] A filtering unit is configured to filter the digital signal.

[0012] According to at least one embodiment of the present disclosure, the filtering unit includes a linear filter, a nonlinear filter, or a combination filter of a linear filter and a nonlinear filter.

[0013] According to at least one embodiment of the present disclosure, the data processing unit further includes:

[0014] a calculation unit, wherein the calculation unit calculates the filtered digital signal to obtain a change value and / or a change rate of the inductive capacitance; and

[0015] A judging unit is configured to judge a change in the shape of the battery and / or a change in the water content around the battery based on a change value and / or a change rate of the inductive capacitance.

[0016] According to at least one embodiment of the present disclosure, the judgment unit can judge the deformation position, deformation amount, deformation range and / or deformation type of the battery according to the change value and / or change rate of the inductive capacitance.

[0017] According to at least one embodiment of the present disclosure, the battery management chip further includes an applying unit, configured to apply excitation to the capacitive sensing device.

[0018] According to at least one embodiment of the present disclosure, the battery management chip further includes a multiplexing unit configured to selectively receive a sensing capacitance signal output by the capacitance sensing device and provide the sensing capacitance signal to the sampling unit.

[0019] According to at least one embodiment of the present disclosure, the battery management chip is used to detect changes in the shape of batteries in a battery pack and / or changes in the water content inside the battery pack, the battery pack includes more than two battery cells, and the two or more battery cells are arranged at a predetermined interval, and the capacitive sensing device includes a first electrode plate and a second electrode plate, 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, and the second electrode plate is arranged on the outer surface, near the outer surface, inner surface, or near the 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.

[0020] According to at least one embodiment of the present disclosure, a first electrode plate and a second electrode plate are provided between every two adjacent batteries of the two or more battery units.

[0021] According to at least one embodiment of the present disclosure, the first electrode plate and / or the second electrode plate is a conductor for battery packaging.

[0022] 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 on the outer surface, near the outer surface, inner surface, or near the inner surface of the battery.

[0023] According to at least one embodiment of the present disclosure, the first electrode plate and the second electrode plate are arranged in parallel.

[0024] According to at least one embodiment of the present disclosure, the first plate includes one or more first plate units, the second plate includes one or more second plate units, the first plate units and the second plate units are arranged in a one-to-one correspondence and constitute a capacitive sensing unit, and the sampling unit collects the induced capacitance generated by each capacitive sensing unit.

[0025] According to at least one embodiment of the present disclosure, the first electrode plate includes one or more first electrode plate units, the second electrode plate includes two or more second electrode plate units, one first electrode plate unit is arranged to correspond to at least two or more second electrode plate units to form a capacitive sensing unit, and the sampling unit collects the induced capacitance generated by each capacitive sensing unit.

[0026] According to at least one embodiment of the present disclosure, the shapes of the first and second electrode plate units are at least one of circular, elliptical, and polygonal, and the first and second electrode plate units arranged in a one-to-one correspondence are respectively arranged on the first and second electrode plates.

[0027] According to at least one embodiment of the present disclosure, the first and second electrode plate units are strip-shaped, and an extension direction of the first electrode plate unit on the first electrode plate and an extension direction of the second electrode plate unit on the second electrode plate form a predetermined angle.

[0028] According to at least one embodiment of the present disclosure, the first plate unit and the second plate unit are respectively a driving unit and a receiving unit or a receiving unit and a driving unit, and the sampling unit collects the inductive capacitance generated between each receiving unit and the corresponding driving unit and the adjacent driving unit.

[0029] According to at least one embodiment of the present disclosure, the first plate unit and the second plate unit are respectively a driving unit and a receiving unit or a receiving unit and a driving unit, and the sampling unit collects the inductive capacitance generated between each receiving unit and each driving unit.

[0030] According to at least one embodiment of the present disclosure, the first plate unit and the second plate unit are respectively a driving unit and a receiving unit or a receiving unit and a driving unit, and the sampling unit collects the inductive capacitance generated between each receiving unit and the corresponding driving unit.

[0031] According to at least one embodiment of the present disclosure, the battery management chip is used to detect changes in the shape of batteries in a battery pack and / or changes in the water content inside the battery pack, the battery pack includes two or more battery cells, and the two or more battery cells are arranged at a predetermined interval, the capacitive sensing device includes a first electrode plate, the first electrode plate is arranged on the outer surface, near the outer surface, inner surface or near the inner surface of a battery cell of adjacent battery cells, and the first electrode plate includes two or more driving electrode plate units and two or more receiving electrode plate units, and the driving electrode plate units are staggered with the electrode plate units.

[0032] According to at least one embodiment of the present disclosure, a first electrode plate is provided between every two adjacent batteries of two or more battery cells, or a first electrode plate is provided on each battery cell.

[0033] According to at least one embodiment of the present disclosure, the first electrode plate is a conductor for battery packaging.

[0034] According to at least one embodiment of the present disclosure, the first electrode plate is a conductor or a conductive material respectively disposed on the outer surface, near the outer surface, inner surface, or near the inner surface of the battery.

[0035] According to at least one embodiment of the present disclosure, the sampling unit collects the inductive capacitance generated between each receiving plate unit and an adjacent transmitting plate unit.

[0036] According to at least one embodiment of the present disclosure, the battery management chip is used to detect changes in the shape of batteries in a battery pack and / or changes in the water content inside the battery pack, the battery pack includes more than two battery cells, and the two or more battery cells are arranged at a predetermined interval, the capacitive sensing device includes a first electrode plate, a second electrode plate and an intermediate electrode plate, 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 battery cell of the adjacent battery cells, and the intermediate electrode plate is arranged between the first electrode plate and the second electrode plate.

[0037] According to at least one embodiment of the present disclosure, a first electrode plate, a second electrode plate, and an intermediate electrode plate are provided between every two adjacent batteries of two or more battery units.

[0038] According to at least one embodiment of the present disclosure, the first electrode plate and the middle electrode plate form a first capacitance sensing structure, which is used to measure the one battery cell, and the second electrode plate and the middle electrode plate form a second capacitance sensing structure, which is used to measure the other battery cell.

[0039] According to at least one embodiment of the present disclosure, the first electrode plate and / or the second electrode plate is a conductor for battery packaging.

[0040] 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 on the outer surface, near the outer surface, inner surface, or near the inner surface of the battery, and the intermediate electrode plate is a conductor.

[0041] 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.

[0042] According to at least one embodiment of the present disclosure, the first plate includes one or more first plate units, the intermediate plate includes one or more intermediate plate units, the first plate units and the intermediate plate units are arranged in a one-to-one correspondence and constitute a capacitive sensing unit, and the sampling unit collects the induced capacitance generated by each capacitive sensing unit.

[0043] According to at least one embodiment of the present disclosure, the second electrode plate includes one or more second electrode plate units, the intermediate electrode plate includes one or more intermediate electrode plate units, the second electrode plate units and the intermediate electrode plate units are arranged in a one-to-one correspondence and constitute a capacitive sensing unit, and the sampling unit collects the induced capacitance generated by each capacitive sensing unit.

[0044] According to at least one embodiment of the present disclosure, the first electrode plate includes one or more first electrode plate units, the intermediate electrode plate includes two or more intermediate electrode plate units, one first electrode plate unit is arranged to correspond to at least two or more intermediate electrode plate units to form a capacitive sensing unit, and the sampling unit collects the induced capacitance generated by each capacitive sensing unit.

[0045] According to at least one embodiment of the present disclosure, the second electrode plate includes one or more second electrode plate units, the intermediate electrode plate includes two or more intermediate electrode plate units, one second electrode plate unit is arranged to correspond to at least two or more intermediate electrode plate units to form a capacitive sensing unit, and the sampling unit collects the induced capacitance generated by each capacitive sensing unit.

[0046] According to at least one embodiment of the present disclosure, the shapes of the first electrode plate unit, the second electrode plate unit and the intermediate electrode plate unit are at least one of circular, elliptical and polygonal, and the first electrode plate unit and the second electrode plate unit arranged in a one-to-one correspondence are respectively arranged on the first electrode plate and the second electrode plate.

[0047] According to at least one embodiment of the present disclosure, the shapes of the first electrode plate unit, the second electrode plate unit and the intermediate electrode plate unit are at least one of circular, elliptical and polygonal, and the first electrode plate unit and the second electrode plate unit arranged in a one-to-one correspondence are respectively arranged on the first electrode plate and the second electrode plate.

[0048] According to at least one embodiment of the present disclosure, the first electrode plate unit and the intermediate electrode plate unit are strip-shaped, and an extension direction of the first electrode plate unit on the first electrode plate and an extension direction of the intermediate electrode plate unit on the intermediate electrode plate form a predetermined angle.

[0049] According to at least one embodiment of the present disclosure, the second electrode plate unit and the intermediate electrode plate unit are strip-shaped, and an extension direction of the second electrode plate unit on the second electrode plate and an extension direction of the intermediate electrode plate unit on the intermediate electrode plate form a predetermined angle.

[0050] According to at least one embodiment of the present disclosure, the first plate unit and the second plate unit are respectively a driving unit and a receiving unit or a receiving unit and a driving unit, and the sampling unit collects the inductive capacitance generated between each receiving unit and the corresponding driving unit and the adjacent driving unit.

[0051] According to at least one embodiment of the present disclosure, the first plate and the second plate are driving plates or receiving plates, the middle plate is a receiving plate or a driving plate, and the sampling unit collects the inductive capacitance generated between each receiving plate and each driving plate.

[0052] According to at least one embodiment of the present disclosure, a first intermediate plate unit corresponding to the first plate unit and a second intermediate plate unit corresponding to the second plate unit are respectively provided on both sides of the intermediate plate.

[0053] According to another aspect of the present disclosure, a battery management system includes the battery management chip as described above, and measures changes in the shape of a battery and / or changes in the water content around the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] 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.

[0055] Figure 1 A schematic diagram of a battery management chip according to one embodiment of the present disclosure is shown.

[0056] Figure 2 A schematic diagram of a battery safety detection module according to one embodiment of the present disclosure is shown.

[0057] Figure 3 A schematic diagram of a capacitance sensing device according to one embodiment of the present disclosure is shown.

[0058] Figure 4 A schematic diagram of a capacitance sensing device according to one embodiment of the present disclosure is shown.

[0059] Figure 5 A schematic diagram of a capacitance sensing device according to one embodiment of the present disclosure is shown.

[0060] Figure 6 A schematic diagram of a capacitance sensing device according to one embodiment of the present disclosure is shown.

[0061] Figure 7 A schematic diagram of a capacitance sensing device according to one embodiment of the present disclosure is shown.

[0062] Figure 8 A schematic diagram of a capacitance sensing device according to one embodiment of the present disclosure is shown.

[0063] Figure 9 A schematic diagram of a capacitance sensing device according to one embodiment of the present disclosure is shown.

[0064] Figure 10 A schematic diagram of a capacitance sensing device according to one embodiment of the present disclosure is shown.

[0065] Figure 11 A schematic diagram of a capacitance sensing device according to one embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0066] The present disclosure will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the relevant content and are not intended to limit the present disclosure. It should also be noted that, for ease of description, only the portions relevant to the present disclosure are shown in the accompanying drawings.

[0067] 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.

[0068] Unless otherwise stated, the exemplary embodiments / examples shown are to be understood as providing exemplary features of various details of some ways in which the technical concepts of the present disclosure can be implemented in practice. Therefore, unless otherwise stated, the features of the various embodiments / examples may be further combined, separated, interchanged, and / or rearranged without departing from the technical concepts of the present disclosure.

[0069] 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 indicated, 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 order described. In addition, the same figure numbers represent the same components.

[0070] When a component is referred to as being “on,” “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 present. For this purpose, the term “connected” may refer to a physical connection, an electrical connection, etc., with or without intervening components.

[0071] For descriptive purposes, the present disclosure may use spatially relative terms such as "below," "beneath," "under," "down," "above," "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 drawings is turned over, a component described as "below" or "beneath" another component or feature would then be positioned "above" the other component or feature. Thus, the exemplary term "below" 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 as such, the spatially relative descriptors used herein should be interpreted accordingly.

[0072] The terms used herein are for the purpose of describing specific embodiments and are not intended to be restrictive. As used herein, 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, the features, integral bodies, steps, operations, parts, assemblies and / or their groups stated are described, but the presence or addition of one or more other features, integral bodies, steps, operations, parts, assemblies and / or their groups is not excluded. It should also be noted that, as used herein, the terms "substantially", "approximately" and other similar terms are used as approximate terms and not as degree terms, and as such, they are used to explain the inherent deviations of the processed values, calculated values and / or values provided that will be recognized by those of ordinary skill in the art.

[0073] According to one embodiment of the present disclosure, a battery management chip is provided, wherein the battery management chip can measure the moisture or water content in a battery pack, and can also measure the deformation of battery cells in the battery pack.

[0074] 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.

[0075] Figure 1 FIG. 1 shows a battery management system according to an embodiment of the present disclosure, wherein the dotted line shows the battery management chip 100 .

[0076] like Figure 1 As shown, the battery management chip 100 can be used to manage a battery, wherein the battery can be a lithium battery pack including multiple lithium batteries connected in series.

[0077] The battery management chip 100 may include a gate detection module, a voltage amplification module, an analog-to-digital conversion module, a control logic module, a switch driving module, a battery safety detection module, a discharge switch MD, and a charge switch MC.

[0078] The selection detection module selects the voltage of each battery and detects the voltage of each battery B1~B n The voltage of the battery. The gate detection module can be used to detect the battery voltage after filtering. The filtering can be performed by the filter resistor R f1 ~R fn And filter capacitors C1~C n This is achieved by forming an RC filter.

[0079] The voltage amplifying module can amplify the voltage of each battery from the strobe detecting module.

[0080] The analog-to-digital conversion module is used to perform analog-to-digital conversion on the voltage of each battery from the voltage amplification module and provide the converted digital signal to the control logic module.

[0081] The control logic module can provide a control signal to the switch driving module based on at least the detected battery voltage, so as to control the discharge switch MD and the charge switch MC through the switch driving module, thereby realizing the charge and discharge control of the battery. When the battery is charging, it is charged through an external charger. When discharging, the battery management system discharges through an external load.

[0082] In addition, the battery management chip may further include a voltage converter, which is used to convert, for example, the highest battery voltage VCC of the battery into various required supply voltages VDD, where VDD may be 5V, for example.

[0083] like Figure 1 As shown, the battery management chip 100 can obtain the positive terminal voltage of the first battery B1 through the PIN1 pin, obtain the positive terminal voltage of the first battery B2 through the PIN2 pin, ..., through the PIN n-1 Pin to get the first battery B n-1 The positive terminal voltage is n Pin to get the first battery B n The positive terminal voltage.

[0084] Figure 2 A schematic diagram of a battery safety detection module in a battery pack according to the first aspect of the present disclosure is shown.

[0085] like Figure 2 As shown, the battery safety detection module is used to detect changes in the shape of the battery and / or changes in the water content around the battery. The battery safety detection module includes: a sampling unit, which is used to collect a sensed capacitance signal output by a capacitance sensing device that measures changes in the shape of the battery and / or changes in the water content around the battery. When the battery shape changes or the water content around the battery changes, the sensed capacitance signal will change; and a data processing unit, which is used to process the sensed capacitance signal collected by the sampling unit to determine changes in the shape of the battery and / or changes in the water content around the battery.

[0086] The data processing unit includes an analog-to-digital conversion unit for converting the analog signal collected by the sampling unit into a digital signal; and a filtering unit for filtering the digital signal. The filtering unit includes a linear filter, a nonlinear filter, or a combination of a linear filter and a nonlinear filter.

[0087] The data processing unit further includes: a calculation unit that calculates the filtered digital signal to obtain a change value and / or change rate of the sensing capacitance; and a judgment unit that determines a change in the shape of the battery and / or a change in the water content around the battery based on the change value and / or change rate of the sensing capacitance. The judgment unit can determine the deformation position, deformation amount, deformation range, and / or deformation type of the battery based on the change value and / or change rate of the sensing capacitance.

[0088] The battery management chip further includes an applying unit, which is used to apply excitation to the capacitive sensing device.

[0089] The battery management chip further includes a multiplexing unit, which is used to selectively receive the sensing capacitance signal output by the capacitance sensing device and provide the sensing capacitance signal to the sampling unit.

[0090] Figure 3 A battery safety detection module in a battery pack according to the first aspect of the present disclosure is shown.

[0091] like Figure 3 As shown, a battery pack may include more than two battery cells. Figure 3 Three battery cells 621, 622 and 623 are shown. It should be noted that other numbers of battery cells may also be used. The following description will be made using three battery cells as an example. The same principle applies to other numbers of battery cells.

[0092] The three battery cells 621 , 622 , and 623 are arranged with predetermined spaces therebetween.

[0093] The battery safety detection module may include a capacitance sensing device and a processing device.

[0094] The capacitive sensing device may include a first electrode plate 601 and a second electrode plate 602. The first electrode plate is disposed on, near, or inside one of the adjacent battery cells, and the second electrode plate is disposed on, near, or inside the other of the adjacent battery cells. The first and second electrode plates are disposed in a predetermined space and face each other. A first electrode plate and a second electrode plate are disposed between every two adjacent batteries in two or more battery cells.

[0095] like Figure 6 As shown, a first electrode plate can be set on the outer surface of the first battery 621, and a second electrode plate can be set on the outer surface of the second battery 622 accordingly, a first electrode plate can be set on the outer surface of the other side of the second battery, and a second electrode plate can be set on the outer surface of the third battery 623 accordingly.

[0096] The data processing unit processes the output signals of the first electrode plate and / or the second electrode plate to obtain the capacitance change between the first electrode plate and the second electrode plate caused by moisture around the battery cell and / or deformation of the battery cell.

[0097] In addition, the data processing unit processes the output signal of the first electrode plate and / or the second electrode plate, and can obtain the capacitance change between the first electrode plate and the second electrode plate generated when the distance between the first electrode plate and the second electrode plate 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.

[0098] Figure 4 Schematic diagram showing water content in a battery pack. Figure 5 shows a schematic diagram of the battery after deformation, where Figure 5 The deformation shown is a battery cell bulging type deformation.

[0099] In the battery pack of the present disclosure, changes in the water content of the battery pack will cause changes in the capacitance between the first and second plates. Deformation of the battery cell will also cause deformation of the first and second plates. When the first and second plates deform, the electrostatic capacitance between the first and second plates will also change. Therefore, changes in the water content of the battery pack and / or deformation of the battery cell can be determined by measuring the change in capacitance.

[0100] According to further embodiments of the present disclosure, the number of first and second plates disposed on the outer surface of a battery may be two or more. The two or more first plates and the two or more second plates are disposed in a one-to-one correspondence and constitute two or more capacitive sensing units. The data processing unit obtains the cell capacitance change values formed by the two or more capacitive sensing units, respectively.

[0101] Figure 6 The embodiment of the present invention shows a case where multiple first and second electrode plates are provided. The number of the first and second electrode plates can be set according to actual conditions, and their shapes can be square, rectangular, circular, trapezoidal, diamond, triangular, T-shaped, interdigitated, polygonal, etc., which are not limited in this disclosure. In other embodiments / examples, the shapes of the electrode plates can also be the above shapes or any other shapes.

[0102] By setting multiple first and second electrode plates, taking the first and second battery cells as an example, multiple first electrode plates are set on the outer surface of the first battery cell, and correspondingly, multiple second electrode plates are also set on the outer surface of the second battery cell. When the size and shape of each pair of first and second electrode plates are the same, when the water content in the battery pack changes, the change in capacitance value detected by each pair of first and second electrode plates is the same (because the change in dielectric constant caused by water content in the battery pack is uniform), but when the size and / or shape of each pair of first and second electrode plates are the same, when the water content in the battery pack changes, the change in capacitance value detected by each pair of first and second electrode plates is different. In this case, the change caused by water content can be obtained by calculating the rate of change of capacitance value of each pair of first and second electrode plates, such as the rate of change of capacitance value between the previous moment and the next moment.

[0103] When the first battery cell and / or the second battery cell at the location where the first electrode plate and the second electrode plate are located are deformed, the static capacitance value generated by the first electrode plate and the second electrode plate will change. Therefore, the deformation of the first battery cell and / or the second battery cell can be obtained by detecting the static capacitance value. Since different first electrodes and second electrodes are arranged at different positions, the static capacitance values generated by each corresponding first electrode plate and second electrode plate may be different. For example, when a bulging type fault occurs, the static capacitance of the first electrode plate and the second electrode plate at the bulging location changes greatly, while the static capacitance of the first electrode plate and the second electrode plate at the non-bulging location 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 electrode plate and the second electrode plate.

[0104] Preferably, the first electrode plate and the second electrode plate are arranged in parallel.

[0105] For example, the data processing unit of the present disclosure may further include a comparison unit configured to compare the capacitance change values and / or change rates of each cell (each cell formed by the corresponding first and second plates) and to determine the change in water content in the battery pack based on the comparison results. The comparison unit may also determine the deformation position, deformation amount, deformation range, and / or deformation type of the battery based on the capacitance change values and / or change rates.

[0106] 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 8In 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 and second plates will be significantly different from the change value and / or change rate of the electrostatic capacitance of the two first and second plates 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 and second plate, the position where the deformation occurs can be obtained, and the type of deformation can also be obtained by 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.

[0107] In one embodiment of the present disclosure, the conductive material used for the external packaging of each battery cell can be used as the first and second electrode plates. For example, battery cells are typically wrapped in aluminum foil, and the aluminum foil used for the wrapping can be used as the first and second electrode plates. Furthermore, an insulating layer or the like can be provided between the aluminum foil and the battery body.

[0108] According to another embodiment of the present disclosure, the first electrode plate and / or the second electrode plate are conductors or conductive materials disposed on or near the outer surface of one battery cell and / or disposed on or near the outer surface of another battery cell, respectively, and may also be disposed near or on the inner surface. For example, a separate conductor may be disposed to serve as the first electrode plate and the second electrode plate, or a conductive material (e.g., a conductive coating) may be disposed to achieve the functions of the first electrode plate and the second electrode plate.

[0109] The battery safety detection module may further include an application device for applying an excitation to the first and / or second plates. It may also include a threshold comparison unit that determines a battery failure (such as excessive water content or excessive deformation) when the capacitance change value and / or rate of change exceeds a predetermined threshold.

[0110] Figure 7 The diagram shows multiple first plates 6011 and second plates 6021. The plates are strip-shaped and arranged crosswise. The first plates can function as emitters and the second plates as receivers, and vice versa. After the first plates are excited sequentially, the induced capacitance obtained from each excited first plate is measured using each second plate.

[0111] Figure 8 The diagram shows multiple first plates 6011 and second plates 6021. The plates are rectangular and arranged in a corresponding manner. A first plate can function as a transmitter plate, and a second plate can function as a receiver plate, or vice versa. After the first plates are excited in sequence, the induced capacitance of each excited first plate is measured using the adjacent second plate.

[0112] Figure 9The diagram shows a case where a second plate 602 is included and multiple first plates 6011 are provided. The first plate can function as an emitter plate and the second plate can function as a receiver plate, or vice versa. After each first plate is excited, the induced capacitance obtained from the excited first plate is measured using the second plate, and vice versa.

[0113] According to another aspect of the present disclosure, a battery management system is provided, including the battery safety detection module as described above, and the battery safety detection module is used to measure the water content and / or deformation of the battery cells in the battery pack.

[0114] According to a second aspect of the present disclosure, a battery safety detection module in a battery pack is provided. The battery pack includes two or more battery cells, which are arranged with a predetermined spacing therebetween. The battery safety detection module includes: a capacitance sensing device, the capacitance sensing device including a first electrode plate array and a second electrode plate array; and a data processing unit, the data processing unit processing output signals of the first electrode plate array and / or the second electrode plate array to obtain a capacitance change between the first electrode plate array and the second electrode plate array generated when the water content in the battery pack changes. The first electrode plate array includes two or more first electrode plates and the second electrode plate array includes two or more second electrode plates, the extension direction of the two or more first electrode plates and the extension direction of the two or more second electrode plates form a predetermined angle, the first electrode plate array is arranged on, near, or inside one of the adjacent battery cells, and the second electrode plate array is arranged on, near, or inside the other of the adjacent battery cells, wherein the first electrode plate array and the second electrode plate array are arranged in the predetermined spacing and opposite to each other. The predetermined angle can be 90 degrees.

[0115] A first electrode plate array and a second electrode plate array are provided between every two adjacent batteries of the two or more battery units. The first electrode plate array and the second electrode plate array can be provided in parallel.

[0116] The following description takes two battery cells as an example. Figure 10 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.

[0117] like Figure 7 As shown, the first electrode 6011 arranged in the first electrode array of the first battery cell can extend along the first direction, and a plurality of them can be arranged in parallel. The second electrode 6021 arranged in the second electrode array of the second battery cell can extend along the second direction, and a plurality of them can also be arranged in parallel. In this way, when the first electrode and the second electrode 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 and the second electrode. It should be noted that although Figure 7In the embodiment, the first electrode plate and the second electrode plate are configured as long strips, but they may also adopt other shapes, which are not limited in the present disclosure.

[0118] The battery safety detection module may further 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.

[0119] For example, an excitation voltage is applied to a first plate at a first time, and then the electrostatic capacitance value between the first plate and the second plate is measured. Then, an excitation voltage is applied to another first plate, and the electrostatic capacitance value between the first plate and the second plate is measured, and so on.

[0120] 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.

[0121] The data processing unit 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 other times, 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 based on the comparison result.

[0122] 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 5 When a bulge-type fault occurs in the shape shown, the change value and / or change rate of the electrostatic capacitance of the first electrode plate and the second electrode plate at the bulge will be greater than the change value and / or change rate of the electrostatic capacitance of the two first electrode plates and the second electrode plates 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 and the second electrode plate, the position where the deformation occurs can be obtained, and the deformation type can also be obtained through the deformation position.

[0123] In one embodiment of the present disclosure, the conductive material used for the external packaging of each battery cell can be used as the first and second electrode plates. For example, battery cells are typically wrapped in aluminum foil, and the aluminum foil used for the wrapping can be used as the first and second electrode plates. Furthermore, an insulating layer or the like can be provided between the aluminum foil and the battery body. In this case, the aluminum foil used for the packaging can be processed to form the first and second electrode plates.

[0124] According to another embodiment of the present disclosure, the first electrode plate and / or the second electrode plate are conductors or conductive materials disposed on or near the outer surface of one battery cell and / or disposed on or near the outer surface of another battery cell, respectively, and may also be disposed on or near the inner surface. For example, a separate conductor may be provided to serve as the first electrode plate and the second electrode plate, or a conductive material (e.g., a conductive material coating) may be provided to achieve the functions of the first electrode plate and the second electrode plate.

[0125] Furthermore, 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 between changes in water content and changes in shape, so that after distinguishing, it can be determined whether the battery has a water content problem or a deformation problem.

[0126] According to a further embodiment of the present disclosure, a battery management system is provided, which includes the battery safety detection module as described above, and the battery safety detection module is used to measure the water content and / or deformation of the battery cells in the battery pack.

[0127] According to a third aspect of the present disclosure, a battery safety detection module in a battery pack is provided, the battery pack including two or more battery cells, which are arranged at a predetermined distance. The battery safety detection module includes: a capacitance sensing device, the capacitance sensing device including a first electrode plate, a second electrode plate and an intermediate electrode plate; and a data processing unit, the data processing unit processing 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. The first electrode plate is arranged on, near or inside an outer surface of one battery cell of the adjacent battery cells, the second electrode plate is arranged on, near or inside an outer surface of the other 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 respectively in the predetermined space.

[0128] A first electrode plate 601 , a second electrode plate 602 and an intermediate electrode plate 603 are provided between every two adjacent batteries of the two or more battery units.

[0129] like Figure 10As shown, an intermediate plate is provided between the first and second plates. Changes in capacitance between the intermediate plate and the first plate can be used to determine changes in water content within the battery pack and / or deformation of the first battery cell. Changes in capacitance between the intermediate plate and the second plate can be used to determine changes in water content within the battery pack and / or deformation of the second battery cell. The principles for other battery cells are the same and will not be further described.

[0130] In one embodiment of the present disclosure, the conductive material used for the external packaging of each battery cell can be used as the first and second electrode plates. For example, battery cells are typically wrapped in aluminum foil, and the aluminum foil used for the wrapping can be used as the first and second electrode plates. Furthermore, an insulating layer or the like can be provided between the aluminum foil and the battery body. In this case, the aluminum foil used for the packaging can be processed to form the first and second electrode plates.

[0131] According to another embodiment of the present disclosure, the first electrode plate and / or the second electrode plate are conductors or conductive materials disposed on or near the outer surface of one battery cell and / or disposed on or near the outer surface of another battery cell, respectively. Alternatively, the first electrode plate and / or the second electrode plate may be disposed on or near the inner surface. For example, a separate conductor may be disposed to serve as the first electrode plate and the second electrode plate, or a conductive material may be disposed to achieve the functions of the first electrode plate and the second electrode plate.

[0132] The intermediate plate can be a single conductor, or conductors / conductive materials can be provided on both sides of the intermediate plate. When the intermediate plate is a single conductor, the change in water content within the battery pack and / or the deformation of the first battery cell and the deformation of the second battery cell can be determined 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. When conductors / conductive materials are provided on both sides of the intermediate plate, the change in water content within the battery pack and / or the deformation of the first battery cell can be measured using the conductor / conductive material on the side of the intermediate plate opposite to the first plate, and the change in water content within the battery pack and / or the deformation of the second battery cell can be measured using the conductor / conductive material on the side of the intermediate plate opposite to the second plate. When conductors or conductive materials are provided on both sides of the intermediate plate, the conductors or conductive materials on both sides are insulated.

[0133] Similar to the above embodiment, the number of the first electrode plate, the second electrode plate, and the intermediate electrode plate is respectively two or more, and the two or more first electrode plates are provided in a one-to-one correspondence with the two or more intermediate electrode plates to constitute two or more first capacitance sensing units, and the two or more second electrode plates are provided in a one-to-one correspondence with the two or more intermediate electrode plates to constitute two or more second capacitance sensing units. The data processing unit respectively obtains the unit capacitance change values and / or change rates respectively formed by the two or more first capacitance sensing units and the two or more second capacitance sensing units.

[0134] The data processing unit includes a comparison unit, which is used to compare the capacitance change values and / or change rates of each unit, and judge 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 based on the comparison results.

[0135] Similarly, the first electrode plate and / or the second electrode plate are conductors 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 and second electrode plates. 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 another battery cell, respectively, and the intermediate electrode plate is a conductor or conductive material disposed between the first and second electrode plates.

[0136] The first electrode plate, the second electrode plate and the middle electrode plate are arranged in parallel.

[0137] The battery is also provided with 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.

[0138] According to a further embodiment of the present disclosure, a battery management system is provided, including the battery safety detection module as described above, which measures the deformation of battery cells in a battery pack and the water content inside the battery pack.

[0139] According to a fourth aspect of the present disclosure, a battery safety detection module in a battery pack is provided, the battery pack including two or more battery cells, the two or more battery cells being arranged at predetermined intervals, the battery safety detection module including: a capacitance sensing device, the capacitance sensing device including a first electrode plate array, a second electrode plate array and an intermediate electrode plate array; and a data processing unit, the data processing unit processing the output signals of the first electrode plate array, the second electrode plate array and / or the intermediate electrode plate array to obtain capacitance changes generated by changes in water content inside the battery pack, and / or capacitance changes generated by changes in 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 The invention comprises two or more first electrode plates, a second electrode plate array including two or more second electrode plates and an intermediate electrode plate array including two or more intermediate electrode plates, an extension direction of the two or more first electrode plates forms a predetermined angle with an extension direction of the two or more intermediate electrode plates, an extension direction of the two or more second electrode plates forms a predetermined angle with an 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 of one battery cell of the adjacent battery cells, the second electrode plate array is arranged on the outer surface or near or the inner surface or near of 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.

[0140] A first electrode array, a second electrode array, and an intermediate electrode array are disposed between each two adjacent batteries in two or more battery cells. The first electrode array, the second electrode array, and the intermediate electrode array are disposed in parallel. The predetermined angle is 90 degrees.

[0141] Conductors or conductive materials are respectively provided on both sides of the intermediate plate array, and the conductors or conductive materials on both sides are insulated.

[0142] It also includes an applying device, which is used to apply excitation to one or more of the two or more first electrode plates in a time-sharing manner, apply excitation to one or more of the two or more second electrode plates in a time-sharing manner, and / or apply excitation to one or more of the two or more intermediate electrode plates in a time-sharing manner.

[0143] The data processing unit obtains the capacitance change value and / or capacitance change rate measured based on each first electrode plate, second electrode plate and / or intermediate electrode plate after applying excitation to the first electrode plate, second electrode plate and / or intermediate electrode plate at one time and at other times, and compares the capacitance change value and / or capacitance change rate, and judges 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.

[0144] 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.

[0145] When the capacitance change exceeds a predetermined threshold, it is determined that the battery has excessive water content or excessive deformation.

[0146] 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.

[0147] The technical solution of the fourth aspect of this disclosure is Figure 7 The example is different in that it further includes an intermediate plate array, and the intermediate plate may include a plurality of strip-shaped intermediate plates.

[0148] For example, multiple first electrode plates may extend parallel to a first direction, multiple second electrode plates may also extend parallel to the first direction, and multiple intermediate electrode plates may extend along a second direction at a certain angle to the first direction, for example, the certain angle may be 90 degrees. The intermediate electrode plates may also be provided on both sides so as to correspond to the first electrode plates and the second electrode plates, respectively. The measurement method may also be similar to the technical solution of the second aspect and will not be repeated here.

[0149] According to a further embodiment of the present disclosure, a battery management system is provided, comprising the battery safety detection module as described above, which measures the deformation of battery cells in a battery pack and / or the water content inside a battery panel.

[0150] In addition, the above example shows the case of measuring the inductive capacitance between two plates, but in the present disclosure, the inductive capacitance between multiple plate units arranged on one plate can also be measured by one plate. Figure 11 As shown, the plurality of plate units include transmitting electrodes 131 and receiving electrodes 132, which are arranged alternately. When a transmitting electrode 131 is excited, the receiving electrode 132 measures the induced capacitance formed between the transmitting electrode 131 and the adjacent transmitting electrode 131.

[0151] The data processing unit may include an application unit that can provide a square wave voltage, a step wave voltage, etc. of a predetermined hertz, and a sampling unit that can receive a signal from the electrode plate, provide the received signal to the analog-to-digital conversion unit, and after conversion by the analog-to-digital conversion unit, provide it to the filtering unit, etc., so that the corresponding capacitance change value can be measured. In addition, when the data processing unit is used to process multiple electrodes, a multiplexing unit can be provided before the sampling unit, for example, a multiplexing switch can be used to select the signal of each electrode plate for measurement.

[0152] 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 sampling multiple plates 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, which can convert the collected capacitance value into a digital signal and then filter it through the filtering unit. The filtering unit can 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, which 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.

[0153] In a preferred embodiment of the present disclosure, when multiple first plates are included, insulating materials or insulating components may be provided between the multiple first plates to prevent short circuits between the first plates when the battery cell is deformed. In addition, similarly, when multiple second plates / intermediate plates are included, each second plate / intermediate 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 plate and the second plate, between the first plate and the intermediate plate, and / or between the second plate and the intermediate plate. When providing the insulating material or insulating component as described above, the insulating material or insulating component may be provided between the two plates, or the surface of each plate may be wrapped with the insulating material or insulating component.

[0154] In addition, in the above implementation manners / examples, the first electrode plate / second electrode plate is arranged on the outer surface of the battery cell. However, the first electrode plate / second electrode plate can also be arranged inside the outer surface of the battery cell, for example, inside the outer packaging of the battery cell.

[0155] 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 can be 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.

[0156] Furthermore, according to a modified embodiment of the present disclosure, when there are more than one first electrode plate, second electrode plate, and intermediate electrode plate, they may be configured to detect changes in water content and / or deformation.

[0157] 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 interacts with each of the N second electrode plates, thereby measuring the corresponding capacitance change. For example, when there are two first electrode plates and these two first electrode plates serve as transmitting electrodes and three second electrode plates serve 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. 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 applied to 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, where m ≥ 1, wherein each of the m intermediate electrode plates interacts with each of the M first electrode plates and the N second electrode plates, thereby measuring the corresponding capacitance change.

[0158] In addition, when the plates are arranged on both sides of the middle plate, the middle parts of the plates on both sides of the middle plate can be arranged to be electric field insulated.

[0159] In the description of this specification, the description with reference to the terms "one embodiment / method", "some embodiments / methods", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment / method or example are included in at least one embodiment / method or example of the present application. In this specification, the schematic expressions 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 an appropriate manner in any one or more embodiments / methods or examples. In addition, those skilled in the art may combine and combine different embodiments / methods or examples described in this specification and the features of different embodiments / methods or examples, unless they are contradictory.

[0160] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0161] Those skilled in the art will appreciate that the above embodiments are merely intended to clearly illustrate the present disclosure and are not intended to limit the scope of the present disclosure. Other changes or modifications may be made based on the above disclosure, and such changes or modifications are still within the scope of the present disclosure.

Claims

1. A battery management chip, characterized in that: The battery management chip is used to detect changes in the shape of batteries in a battery pack and changes in the water content around the batteries. The battery pack includes two or more battery cells, and the two or more battery cells are arranged with a predetermined space between them. The battery management chip includes: a sampling unit configured to collect a sensing capacitance signal output by a capacitance sensing device for measuring changes in the shape of the battery and changes in the water content around the battery, wherein the sensing capacitance signal will change when the shape of the battery changes or the water content around the battery changes; and a data processing unit, configured to process the inductive capacitance signal collected by the sampling unit, so as to obtain a shape change of the battery and a water content change around the battery through the inductive capacitance signal; The data processing unit calculates the capacitance change rate of the sensing capacitor of the capacitive sensing device at a previous moment and a next moment to determine whether the water content around the battery has changed, and calculates the static capacitance value of the capacitive sensing device to determine whether the shape of the battery has changed. The capacitive sensing device includes a first electrode plate and a second electrode plate, wherein the first electrode plate is arranged on the outer surface of one of the adjacent battery cells, and the second electrode plate is arranged on the outer surface of the other of the adjacent battery cells, wherein the first electrode plate and the second electrode plate are arranged opposite to each other and in parallel, and a first electrode plate and a second electrode plate are arranged between every two adjacent batteries of more than two battery cells.

2. The battery management chip according to claim 1, wherein: The data processing unit includes: an analog-to-digital conversion unit, configured to convert the analog signal collected by the sampling unit into a digital signal; and A filtering unit is configured to filter the digital signal.

3. The battery management chip according to claim 2, wherein: The filtering unit includes a linear filter, a nonlinear filter, or a combination filter of a linear filter and a nonlinear filter.

4. The battery management chip according to claim 3, wherein: The data processing unit further includes: a calculation unit, wherein the calculation unit calculates the filtered digital signal to obtain a change value or a change rate of the inductive capacitance; and A judging unit is configured to judge the change in shape of the battery and the change in water content around the battery based on the change value or change rate of the inductive capacitance.

5. The battery management chip according to claim 4, wherein: The determining unit can determine the deformation position, deformation amount, deformation range or deformation type of the battery according to the change value of the sensing capacitance.

6. The battery management chip according to claim 1, wherein: The battery management chip further includes an applying unit, which is used to apply excitation to the capacitive sensing device.

7. The battery management chip according to claim 1, wherein: The battery management chip further includes a multiplexing unit, which is used to selectively receive the sensing capacitance signal output by the capacitance sensing device and provide the sensing capacitance signal to the sampling unit.

8. The battery management chip according to claim 1, wherein: The first electrode plate and the second electrode plate are conductors for battery packaging.

9. The battery management chip according to claim 1, wherein: The first electrode plate and the second electrode plate are conductors respectively arranged on the outer surfaces of the battery.

10. The battery management chip according to claim 1, wherein: The first plate includes one or more first plate units, the second plate includes one or more second plate units, the first plate units and the second plate units are arranged in a one-to-one correspondence and constitute a capacitance sensing unit, and the sampling unit collects the induced capacitance generated by each capacitance sensing unit.

11. The battery management chip according to claim 1, wherein: The first plate includes one or more first plate units, the second plate includes two or more second plate units, one first plate unit corresponds to at least two or more second plate units to form a capacitance sensing unit, and the sampling unit collects the induced capacitance generated by each capacitance sensing unit.

12. The battery management chip according to claim 10, wherein: The shapes of the first electrode plate unit and the second electrode plate unit are at least one of circular, elliptical, and polygonal, and the first electrode plate unit and the second electrode plate unit are arranged in a one-to-one correspondence on the first electrode plate and the second electrode plate, respectively.

13. The battery management chip according to claim 10, wherein: The first electrode plate unit and the second electrode plate unit are in a strip shape, and an extension direction of the first electrode plate unit on the first electrode plate and an extension direction of the second electrode plate unit on the second electrode plate form a predetermined angle.

14. The battery management chip according to claim 10, wherein: The first plate unit is a driving unit and the second plate unit is a receiving unit, or the first plate unit is a receiving unit and the second plate unit is a driving unit, and the sampling unit collects the inductive capacitance generated between each receiving unit and the corresponding driving unit and the adjacent driving unit.

15. The battery management chip according to claim 13, wherein: The first plate unit is a driving unit and the second plate unit is a receiving unit, or the first plate unit is a receiving unit and the second plate unit is a driving unit, and the sampling unit collects the inductive capacitance generated between each receiving unit and each driving unit.

16. The battery management chip according to claim 11, wherein: The first plate unit is a driving unit and the second plate unit is a receiving unit, or the first plate unit is a receiving unit and the second plate unit is a driving unit, and the sampling unit collects the inductive capacitance generated between each receiving unit and the corresponding driving unit.

17. The battery management chip according to any one of claims 1 to 7, characterized in that: The capacitive sensing device includes a first electrode plate, which is arranged on the outer surface of a battery cell of adjacent battery cells, and the first electrode plate includes more than two driving electrode plate units and more than two receiving electrode plate units, and the driving electrode plate units and the receiving electrode plate units are arranged in an alternating manner.

18. The battery management chip according to claim 17, wherein: A first electrode plate is provided between every two adjacent batteries of more than two battery cells, or a first electrode plate is provided on each battery cell.

19. The battery management chip according to claim 18, wherein: The first electrode plate is a conductor for battery packaging.

20. The battery management chip according to claim 17, wherein: The first electrode plates are conductors respectively arranged on the outer surface of the battery.

21. The battery management chip according to claim 17, wherein: The sampling unit collects the inductive capacitance generated between each receiving plate unit and the adjacent transmitting plate unit.

22. The battery management chip according to any one of claims 1 to 7, characterized in that: The capacitive sensing device includes a first electrode plate, a second electrode plate and an intermediate electrode plate, wherein 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, and the intermediate electrode plate is arranged between the first electrode plate and the second electrode plate.

23. The battery management chip according to claim 22, wherein: A first electrode plate, a second electrode plate and an intermediate electrode plate are provided between every two adjacent batteries of the two or more battery units.

24. The battery management chip according to claim 22, wherein: The first electrode plate and the middle electrode plate form a first capacitance sensing structure for measuring the one battery cell, and the second electrode plate and the middle electrode plate form a second capacitance sensing structure for measuring the other battery cell.

25. The battery management chip according to claim 24, wherein: The first electrode plate and the second electrode plate are conductors for battery packaging.

26. The battery management chip according to claim 24, wherein: The first electrode plate and the second electrode plate are conductors respectively arranged on the outer surfaces of the battery, and the middle electrode plate is a conductor.

27. The battery management chip according to claim 24, wherein: The first electrode plate, the second electrode plate and the intermediate electrode plate are arranged in parallel.

28. The battery management chip according to claim 24, wherein: The first plate includes one or more first plate units, the intermediate plate includes one or more intermediate plate units, the first plate units and the intermediate plate units are arranged in a one-to-one correspondence and constitute capacitance sensing units, and the sampling unit collects the sensing capacitance generated by each capacitance sensing unit.

29. The battery management chip according to claim 28, wherein: The second plate includes more than one second plate unit, the intermediate plate includes more than one intermediate plate unit, the second plate unit and the intermediate plate unit are arranged in a one-to-one correspondence and constitute a capacitance sensing unit, and the sampling unit collects the sensing capacitance generated by each capacitance sensing unit.

30. The battery management chip according to claim 24, wherein: The first electrode plate includes one or more first electrode plate units, the intermediate electrode plate includes two or more intermediate electrode plate units, and one first electrode plate unit is arranged to correspond to at least two or more intermediate electrode plate units to form a capacitance sensing unit. The sampling unit collects the sensing capacitance generated by each capacitance sensing unit.

31. The battery management chip according to claim 30, wherein: The second plate includes one or more second plate units, the intermediate plate includes two or more intermediate plate units, and one second plate unit is arranged to correspond to at least two or more intermediate plate units to form a capacitance sensing unit. The sampling unit collects the sensing capacitance generated by each capacitance sensing unit.

32. The battery management chip according to claim 29, wherein: The shapes of the first electrode plate unit, the second electrode plate unit and the intermediate electrode plate unit are at least one of circular, elliptical and polygonal, and the first electrode plate unit and the second electrode plate unit arranged in a one-to-one correspondence are respectively arranged on the first electrode plate and the second electrode plate.

33. The battery management chip according to claim 31, wherein: The shapes of the first electrode plate unit, the second electrode plate unit and the intermediate electrode plate unit are at least one of circular, elliptical and polygonal, and the first electrode plate unit and the second electrode plate unit arranged in a one-to-one correspondence are respectively arranged on the first electrode plate and the second electrode plate.

34. The battery management chip according to claim 33, wherein: The first electrode plate unit and the intermediate electrode plate unit are in a strip shape, and an extension direction of the first electrode plate unit on the first electrode plate and an extension direction of the intermediate electrode plate unit on the intermediate electrode plate form a predetermined angle.

35. The battery management chip according to claim 34, wherein: The second electrode plate unit and the intermediate electrode plate unit are in a strip shape, and an extension direction of the second electrode plate unit on the second electrode plate and an extension direction of the intermediate electrode plate unit on the intermediate electrode plate form a predetermined angle.

36. A battery management system, characterized in that: The battery management chip comprises the battery management chip according to any one of claims 1 to 35, wherein the battery management chip is used to measure the shape change of the battery and the change of the water content around the battery.

Images