Detection net, cell, battery module and electric vehicle

Abstract

A detection net (3), a battery cell (11), a battery module (100), and an electric vehicle (200), wherein the detection net (3) includes a first conductive portion and a second conductive portion, the first conductive portion includes a first drawer portion (311) and a plurality of first protrusions (3111) arranged in line with the first drawer portion (311), the second conductive portion includes a second drawer portion (312) and a plurality of second protrusions (3121) arranged in line with the second drawer portion (312), and the plurality of first protrusions (3111) and the plurality of second protrusions (3121) intersect in sequence and are arranged at intervals from each other.

Description

[Technical Field]

[0001] (CROSS-REFERENCE TO RELATED APPLICATIONS) This application claims priority from Chinese Patent Application No. "202021786853.X" filed by BD Company Limited on August 24, 2020, entitled "Detection Net, Cell, Battery Module and Electric Vehicle."

[0002] The present application relates to the technical field of power supply devices, and in particular to detection nets, cells, battery modules and electric vehicles. [Background technology]

[0003] As people's awareness of environmental protection increases, more and more electric vehicles are attracting people's attention. As the main power assembly of an electric vehicle, the battery plays an important role in ensuring the long-term stable operation of the electric vehicle.

[0004] A cell is the smallest unit of a battery, and during the operation of the battery, it is difficult for a battery management system to constantly monitor the operation status of each cell, and it is particularly difficult to detect electrolyte leakage in a cell in a timely manner. During the operation of the battery, if electrolyte leakage occurs and is not discharged from the battery in a timely manner, there is a high possibility that the battery will short-circuit, and even ignite or explode. Summary of the Invention

[0005] The present application aims to solve at least one of the technical problems in the prior art by providing a detection net that makes it easier and simpler to monitor a cell for leakage and water intrusion.

[0006] The detection net includes a first conductive portion and a second conductive portion, the first conductive portion includes a first drawer portion and a plurality of first protrusions arranged side by side on the first drawer portion, the second conductive portion includes a second drawer portion and a plurality of second protrusions arranged side by side on the second drawer portion, and the plurality of first protrusions and the plurality of second protrusions intersect in sequence and are arranged at intervals from each other.

[0007] As a result, the multiple first protrusions and the multiple second protrusions are installed at intervals from each other in the normal state, and when adjacent first protrusions and second protrusions are connected by a conductor, the first conductive portion and the second conductive portion are connected, thereby enabling good monitoring function.

[0008] The single battery includes a case, a cell assembly, and the detection net described in the above example, the cell assembly is installed in the case and includes at least one cell, the detection net is installed insulatively between the case and the cell assembly, a connection port is installed in the case, and the first lead-out portion and the second lead-out portion are both electrically connected to the connection port.

[0009] The battery module includes at least one battery, a BMS system, a tray, and the detection net described in the above embodiment, wherein the battery is installed in the tray, the detection net is installed in an insulating manner between the battery and the bottom surface of the tray, and the first drawer section and the second drawer section are both electrically connected to the BMS system.

[0010] The electric vehicle includes the battery module described in the above embodiments.

[0011] Additional aspects and advantages of the present application will be set forth in part in the description that follows, and in part will be obvious from the description, or may be learned by practice of the present application. [Brief explanation of the drawings]

[0012] The above and / or additional aspects and advantages of the present application will become more apparent and easier to understand by describing examples with reference to the following drawings.

[0013] [Figure 1] 1 is a schematic diagram of a detection net according to an embodiment of the present application; [Figure 2] FIG. 1 is a schematic diagram of an exploded structure of a cell according to an embodiment of the present application. [Figure 3] FIG. 2 is a schematic diagram of a detection net for a battery according to an embodiment of the present application. [Figure 4] 1 is a schematic diagram of an assembled structure of a cell according to an embodiment of the present application. [Figure 5] FIG. 1 is a schematic diagram illustrating a state in which a detection net and a cell assembly of a single battery according to an embodiment of the present application are assembled. [Figure 6] FIG. 6 is an enlarged view of part A in FIG. 5. [Figure 7] 1 is a schematic diagram of an exploded structure of a battery module according to an embodiment of the present application. [Figure 8] 1 is a schematic diagram of an exploded structure of a battery module according to an embodiment of the present application. [Figure 9] 1 is a schematic diagram illustrating a configuration in which a battery and a detection net of a battery module according to an embodiment of the present application are assembled. [Figure 10] 1 is a side view of a battery module according to an embodiment of the present application when the battery and the detection net are assembled together; [Figure 11] FIG. 11 is an enlarged view of part B in FIG. [Figure 12] 1 is a schematic diagram of an electric vehicle according to an embodiment of the present application; DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, the embodiments of the present application will be described in detail, and examples of the embodiments are shown in the drawings, and the same or similar reference numerals throughout indicate the same or similar parts or parts having the same or similar functions. The embodiments described below with reference to the drawings are merely illustrative and are intended to interpret the present application, but should not be understood as limiting the present application.

[0015] In addition, in the description of this application, the orientations or positional relationships indicated by terms such as "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" are based on the orientations or positional relationships shown in the drawings, and are intended merely to facilitate and simplify the description of this application. They do not indicate or suggest that the devices or components shown must have a specific orientation and be configured and operate in a specific orientation, and therefore should not be understood as limiting this application.

[0016] It should be noted that the terms "first" and "second" are for descriptive purposes only and should not be understood to denote or suggest relative importance or to implicitly indicate the number of technical features depicted. Thus, a feature qualified by "first" or "second" may explicitly or implicitly include one or more of the feature. Furthermore, in the description of this application, unless otherwise specified, "plurality" means two or more than two.

[0017] As shown in FIGS. 1 to 11, the detection net 3 according to the embodiment of the present application includes: It includes a first conductive portion and a second conductive portion, and as shown in Figure 1, the first conductive portion includes a first drawer portion 311 and a plurality of first protrusions 3111 arranged side by side with the first drawer portion 311, and the second conductive portion includes a second drawer portion 312 and a plurality of second protrusions 3121 arranged side by side with the second drawer portion 312, and the plurality of first protrusions 3111 and the plurality of second protrusions 3121 are arranged in sequence and spaced apart from each other, like a structure in which two combs face each other and the comb teeth are inserted into each other.

[0018] Specifically, when the first protrusions 3111 and the second protrusions 3121 are arranged in a sequentially intersecting relationship and spaced apart from one another, a short circuit between the first conductive portion and the second conductive portion can be avoided. In this case, the first conductive portion and the second conductive portion are not electrically connected. When adjacent first protrusions 3111 and second protrusions 3121 are connected by a conductor, the first conductive portion and the second conductive portion are electrically connected. For example, when the detection net 3 is applied to a battery, if a problem occurs in which electrolyte leaks into the battery or water invades the battery, the small distance between the first protrusions 3111 and the second protrusions 3121 causes the first protrusions 3111 and the second protrusions 3121 to communicate with each other after the electrolyte leaks or water invades the battery. In this case, a signal indicating that the first conductive portion and the second conductive portion are electrically connected is output to the outside, making it easy to monitor the battery for leakage or water intrusion.

[0019] The detection net 3 of the embodiment of the present application includes a plurality of first protrusions 3111 and a plurality of second protrusions 3121 arranged crosswise to each other, the plurality of first protrusions 3111 are connected in a row to the first lead-out portion 311, and the plurality of second protrusions 3121 are connected in a row to the second lead-out portion 312, the plurality of first protrusions 3111 and the plurality of second protrusions 3121 are arranged at intervals from each other in the normal state, and when adjacent first protrusions 3111 and second protrusions 3121 are connected by a conductor, the first conductive portion and the second conductive portion are connected, and a signal indicating that the first conductive portion and the second conductive portion are connected is used to monitor whether or not there is a conductor (i.e., leakage, water entering a single cell), thereby ensuring the monitoring function of the detection net 3.

[0020] In some embodiments, the first conductive portion and the second conductive portion have the same structure.

[0021] Specifically, the fact that the first conductive portion and the second conductive portion have the same structure can be understood as meaning that the structural dimensions of the first lead-out portion 311 and the second lead-out portion 312 are the same, for example, both are linear, the number of first protrusions 3111 is the same as the number of second protrusions 3121, and the plurality of first protrusions 3111 can be uniformly arranged in the first lead-out portion 311, and the plurality of second protrusions 3121 can be uniformly arranged in the second lead-out portion 312. When the plurality of first protrusions 3111 and the plurality of second protrusions 3121 are arranged in sequence and spaced apart from each other, the uniformity and stability of detection of the detection net 3 can be ensured.

[0022] As shown in FIGS. 2 to 6, the cell 11 according to the embodiment of the present application has: The device includes a case 1, a cell assembly 2, and the detection net 3. The case 1 includes a housing 102 and a cover plate 103. The housing 102 has an opening on at least one side, and the cover plate 103 covers the opening. The cell assembly 2 is installed inside the case 1.

[0023] Specifically, the cell assembly 2 is installed in an accommodating cavity formed by the housing 102 and the cover plate 103 and includes at least one cell 201, and the detection net 3 is installed insulatingly between the case 1 and the cell assembly 2 to avoid a short circuit between the first conductive part and the second conductive part of the detection net 3.

[0024] A connection port 101 is provided on the case 1, and the first lead-out portion 311 and the second lead-out portion 312 are both electrically connected to the connection port 101. The connection port 101 may be provided on a cover plate 103, and the connection port 101 facilitates the output of parameter information from the cells 11 to the outside, and the opening facilitates the insertion and removal of the cell assembly 2, which includes at least one cell 201.

[0025] The number of cells 201 may be one, two, three, four, five or more. When the number of cells 201 is more than one, the cells 201 may be installed in series, in parallel, or in a combination of series and parallel, and the embodiments of the present application are not limited thereto.

[0026] In the embodiment of the present application, when a problem of electrolyte leakage into the cell 11 or water intrusion into the cell 11 occurs due to the first conductive part and the second conductive part of the detection net 3, the first protrusion 3111 and the second protrusion 3121 are connected to each other by a conductive liquid such as electrolyte or water, and this conduction information is output to the outside through the connection port 101. After that, the problem of electrolyte leakage from the cell 11 or water intrusion into the cell 11 can be quickly and easily detected, and the cell 11 can be maintained in a timely manner to ensure the safety and stability of the operation of the cell 11.

[0027] As shown in FIGS. 5 and 6, the detection net 3 is installed so as to enclose the cell assembly 2.

[0028] In actual use, the arrangement of the cells 11 may vary, for example, one side of the cover plate 103 may be arranged upward, or one side of the cover plate 103 may be arranged facing the side, in which case electrolyte leakage from the cells 11 may occur at the bottom, side, or top. If the detection net 3 is installed to surround the cell assembly 2, the detection net 3 can monitor leakage in a timely manner regardless of the direction of electrolyte leakage from the cells 11, ensuring the safety of use of the cells 11. Furthermore, if the arrangement of the cells 11 is not already determined during manufacture, the detection net 3 can be installed between the cell assembly 2 and the bottom of the case 1.

[0029] As shown in FIGS. 3 and 4, when the case 1 is a metal case, a first insulating layer 4 is provided between the case 1 and the detection net 3.

[0030] As can be understood, when the case 1 is a metal case, in order to ensure good insulation between the case 1 and the detection net 3, a first insulating layer 4 can be installed between the detection net 3 and the case 1, and the first insulating layer 4 can avoid short circuits caused by contact between the detection net 3 and the case 1.

[0031] The degree of density of the intersection between the first protrusions 3111 and the second protrusions 3121 has a positive correlation with the detection accuracy of the detection net 3.

[0032] When problems such as electrolyte leakage into the cell 11 or water intrusion into the cell 11 occur, electrical continuity can be achieved only when a conductive liquid such as electrolyte or water is present between the first protrusion 3111 and the second protrusion 3121. If the first protrusion 3111 and the second protrusion 3121 are not intersected with each other, in the early stages of electrolyte leakage or water intrusion into the cell 11, the amount of conductive liquid such as electrolyte or water is too small to timely establish electrical continuity between the first protrusion 3111 and the second protrusion 3121. Only when the amount of conductive liquid such as electrolyte or water is large can electrical continuity be achieved between the first protrusion 3111 and the second protrusion 3121. In other words, when the first protrusion 3111 and the second protrusion 3121 are not intersected with each other, the detection accuracy of the detection net 3 is low. When the first protrusion 3111 and the second protrusion 3121 are closely intersected, in the early stage when electrolyte leakage or water intrusion into the cell occurs, the first protrusion 3111 and the second protrusion 3121 are electrically connected in a timely manner by a conductive liquid such as electrolyte or water. In other words, when the first protrusion 3111 and the second protrusion 3121 are closely intersected, the detection accuracy of the detection net 3 is high.

[0033] In some embodiments, the detection net 3 is a metal detection net. Specifically, the material of the metal detection net may be a highly conductive metal such as silver, copper, gold, aluminum, tungsten, nickel, or iron, which can improve the detection sensitivity of the detection net 3. Furthermore, since the detection net 3 needs to surround the cell assembly 2, the material of the metal detection net may be a highly ductile metal material such as silver, gold, aluminum, or tungsten.

[0034] The first insulating layer 4 is a plastic insulating layer or a rubber insulating layer. Both plastic and rubber materials have good insulating properties and high structural strength and toughness, and can provide stable structural support for the detection net 3.

[0035] In some embodiments, the detection net 3 may be glued to the surface of the first insulating layer 4, in which case the detection net 3 and the first insulating layer 4 can be tightly adhered to each other, improving the compactness of the structure of the detection net 3, and the first insulating layer 4 can serve as a support for the detection net 3, thereby avoiding the structure of the first conductive part and the second conductive part of the detection net 3 from being misaligned and ensuring the detection stability of the detection net 3.

[0036] As shown in FIG. 2, the cell assembly 2 further includes an insulating holder 202 installed at the end of the cell 201 .

[0037] A connection terminal is generally installed at the end of the cell 201, and when there is only one cell 201, the connection terminal of the cell 201 can be easily connected to other cells, but when there are multiple cells 201, the connection terminal of the cell 201 is connected to other cells 201, and when the connection terminal is close to the detection net 3, there is a risk of a short circuit due to contact between the connection terminal and the detection net 3. The installation of the insulating holder 202 can provide insulation and support for the connection terminal.

[0038] The battery module 100 according to the embodiment of the present application includes at least one battery, a BMS system, a tray 12 and a cell 11 .

[0039] As shown in FIGS. 7 to 11, a battery module 100 according to an embodiment of the present application includes at least one battery, a BMS system, a tray 12, and a detection net 3. The battery is installed in the tray 12, the detection net 3 is installed insulatively between the battery and the tray 12, and the battery is electrically connected to the BMS system through the connection port 101.

[0040] The BMS (Battery Management System) system acquires operating parameters of the batteries in the battery module 100, controls the operation of the batteries, and can detect and control parameter information such as the battery's charge / discharge voltage and operating temperature.

[0041] The battery may be the cell 11 in the above embodiment, and the first drawer 311 and the second drawer 312 are electrically connected to the BMS system via the connection port 101.

[0042] As shown in Figures 10 and 11, in the battery module 100 according to the embodiment of the present application, when electrolyte leakage occurs in the single battery 11, the BMS system obtains the conductivity information of the first protrusion 3111 and the second protrusion 3121 through the connection port 101, thereby monitoring the problem of electrolyte leakage inside the single battery 11 and sending a feedback signal in a timely manner.

[0043] In some embodiments, the BMS system includes an alarm assembly. After obtaining the continuity information of the first protrusion 3111 and the second protrusion 3121, the BMS system can determine that electrolyte leakage has occurred inside the cell 11. In this case, the BMS system can send an alarm notification to the outside via the alarm assembly. The alarm notification may be an audible alarm or may display the alarm information on the display screen of the electric vehicle 200. This allows the user to deal with the leakage problem in a timely manner and ensure the safety of the electric vehicle 200 and the user.

[0044] As shown in FIGS. 7 and 8, the battery module 100 further includes a second insulating layer 13 disposed to encase the battery.

[0045] The detection net 3 is installed insulatingly between the battery and the tray 12, and the battery case is often a metal case, and a second insulating layer 13 can be installed around the battery to ensure insulation between the detection net 3 and the battery.

[0046] As shown in Fig. 7, if the tray 12 is a metal tray, a third insulating layer 14 can be installed between the tray 12 and the detection net 3 to ensure insulation between the tray 12 and the detection net 3. Also, as shown in Fig. 8, if the tray 12 is an insulating tray, direct contact between the detection net 3 and the tray 12 will not cause a short circuit between the first and second conductive parts of the detection net 3, so the installation of the third insulating layer 14 can be omitted.

[0047] An electric vehicle 200 according to an embodiment of the present application includes the battery module 100 according to the above embodiment.

[0048] Specifically, the battery module 100 can use the detection net 3 to quickly and easily detect problems such as electrolyte leakage or water intrusion into the cells in the battery module 100, and can then perform timely maintenance on the battery module 100 to ensure the safety and stability of the operation of the electric vehicle 200.

[0049] Although embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is limited only by the claims and their equivalents.

Claims

1. A battery (11) including a case (1), a cell assembly (2) and a first detection net (3), The cell assembly (2) is installed in the case (1) and includes at least one cell (201), each cell including an electrode body, an electrolyte, and a container for accommodating the electrode body and the electrolyte, and the first detection net (3) is installed in an insulating manner between the case (1) and the cell assembly (2); The first detection net (3) monitors leakage of electrolyte from the cell assembly (2) and intrusion of water into the case (1), and includes a first conductive portion and a second conductive portion, the first conductive portion including a first lead-out portion (311) and a plurality of first protrusions (3111) arranged side by side on the first lead-out portion (311), the second conductive portion including a second lead-out portion (312) and a plurality of second protrusions (3121) arranged side by side on the second lead-out portion (312), the plurality of first protrusions (3111) and the plurality of second protrusions (3121) intersecting in order and arranged at intervals from each other, A connection port (101) is arranged on the case (1), and the first lead-out portion (311) and the second lead-out portion (312) are both electrically connected to the connection port (101); The first detection net (3) is arranged to enclose the cell assembly (2) and is arranged adjacent to the side and bottom surfaces of the cell assembly (2).

2. The single battery (11) according to claim 1, characterized in that the structural dimensions of the first lead portion (311) and the second lead portion (312) are the same, both are linear, and the number of the first protrusions (3111) and the number of the second protrusions (3121) are the same.

3. The cell (11) according to claim 1 or 2, characterized in that the case (1) is a metal case, and a first insulating layer (4) is arranged between the case (1) and the first detection net (3).

4. The cell (11) according to any one of claims 1 to 3, characterized in that the case (1) includes a housing (102) and a cover plate (103), an opening is arranged on at least one side of the housing (102), the cover plate (103) covers the opening, and the connection port (101) is arranged on the cover plate (103).

5. A battery module (100) comprising at least one battery, a BMS system, and a tray (12), wherein the battery is a single cell according to any one of claims 1 to 4.

6. An electric vehicle (200) comprising the battery module (100) of claim 5.

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