Cell monitoring module, cell, and battery module

Abstract

The present application discloses a cell monitoring module, a cell, and a battery module. The cell monitoring module comprises: a cell acquisition board comprising a base plate and an acquisition device arranged on the base plate; and an antenna arranged on the base plate and covering the acquisition device, the antenna being electrically connected to the cell acquisition board and configured to transmit to an external apparatus performance data acquired by the cell acquisition board. In the cell monitoring module of the present application, the antenna is arranged on the base plate of the cell acquisition board and covers the acquisition device on the base plate, so as to implement mechanical protection for the acquisition device, preventing the acquisition device from being directly impacted and reducing the probability of damage, thereby reducing the failure risk of a wireless BMS; moreover, the antenna and the base plate of the cell acquisition board are integrally arranged, reducing the mounting space occupied in the cell, thereby facilitating miniaturization design of the cell.

Description

Cell monitoring module, cell and battery module

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese patent application No. 2024228018081, filed on November 15, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of power battery technology, and in particular to a cell monitoring module, a cell, and a battery module. Background Technology

[0004] In recent years, with the booming development of new energy vehicles, higher requirements have been put forward for the monitoring of power batteries.

[0005] Traditional BMS (Battery Management System) uses cables to transmit data collected from battery cells. This results in cables running between cells and between cells and the control device, placing a heavy load on the vehicle and affecting its driving range. Therefore, wireless BMS has emerged. Wireless BMS transmits data wirelessly, eliminating the need for cables weighing tens of kilograms, thus reducing weight and extending the vehicle's driving range. Furthermore, eliminating cables significantly reduces material and installation costs, which is of great significance for promoting the development of new energy vehicles.

[0006] However, in the relevant wireless BMS architecture, the data acquisition devices used to collect battery cell information are exposed and easily damaged by external impacts, which can directly lead to device failure and cause the wireless BMS to malfunction, resulting in a high risk of failure. Furthermore, the antennas used for communication between the data acquisition devices and external equipment are arranged independently, occupying a significant amount of battery cell installation space, which is not conducive to the miniaturization design of the battery cells.

[0007] Application content

[0008] The main purpose of this application is to propose a battery cell monitoring module, which aims to solve the technical problems of exposed and easily damaged acquisition devices in the existing battery cell wireless BMS architecture, as well as the independent antenna arrangement that occupies a lot of battery cell installation space.

[0009] To achieve the above objectives, this application proposes a battery cell monitoring module, which includes:

[0010] A battery cell acquisition board includes a substrate and acquisition devices disposed on the substrate;

[0011] An antenna is disposed on the substrate and covers the acquisition device. The antenna is electrically connected to the battery cell acquisition board and is used to transmit the performance data acquired by the battery cell acquisition board to an external device.

[0012] In some embodiments, the antenna includes an antenna body and a plurality of support feet disposed along the periphery of the antenna body, the antenna body covering the acquisition device, and the plurality of support feet being welded to the substrate.

[0013] In some embodiments, the antenna body is plate-shaped, the support feet are located at the periphery of the antenna body and perpendicular to it, a plurality of the support feet are evenly arranged along the periphery of the antenna body, and the spacing between any two adjacent support feet is equal.

[0014] In some embodiments, the end of the support foot away from the antenna body is provided with an inwardly bent welding portion, which is used for welding to the substrate.

[0015] In some embodiments, the support foot has an upper end and a lower end opposite to each other. The upper end of the support foot is connected to or integrally formed with the antenna body, and the lower end of the support foot is away from the antenna body and has the welded portion.

[0016] In some embodiments, the substrate is provided with pads adapted to the welding portion, the pads being used to ensure that the substrate has sufficient welding area to weld to the welding portion.

[0017] In some embodiments, the substrate is provided with a signal transmission line, and at least one of the plurality of support feet is electrically connected to the signal transmission line so that the antenna is electrically connected to the battery cell acquisition board.

[0018] In some embodiments, at least one side of the antenna body is provided with a bend.

[0019] In some embodiments, the bent portion extends toward the direction of the substrate, and the extension length is less than the length of the support leg.

[0020] In some embodiments, the antenna is provided with openings to broaden the bandwidth.

[0021] In some embodiments, the opening is L-shaped, with one end extending to the edge of the antenna.

[0022] In some embodiments, the acquisition device can be configured in various ways, such as a temperature sensor, a pressure sensor, and a component for voltage acquisition, to acquire status information such as temperature, pressure, and voltage of the battery cell.

[0023] This application also proposes a battery cell, which includes a battery cell body and a battery cell monitoring module for collecting performance data of the battery cell, wherein the battery cell monitoring module is as described above.

[0024] In some embodiments, the battery cell further includes a top cover located on top of the battery cell body, and the top cover is provided with a positive terminal and a negative terminal;

[0025] The cell monitoring module is located on the top cover. The cell monitoring module is electrically connected to the positive terminal and the negative terminal respectively through a data acquisition line, which is embedded in the top cover.

[0026] This application also proposes a battery module, which includes:

[0027] Box;

[0028] The main control board is located in the enclosure;

[0029] Multiple battery cells, as described above, are arranged inside the housing, and the antennas of the multiple battery cells are communicatively connected to the main control board.

[0030] The battery cell monitoring module of this application uses an antenna mounted on the substrate of the battery cell acquisition board to cover the acquisition devices on the substrate, thereby achieving mechanical protection of the acquisition devices and preventing them from being directly impacted, thus reducing the probability of damage and minimizing the failure risk of the wireless BMS. Furthermore, the integration of the antenna with the substrate of the battery cell acquisition board reduces the space occupied by the battery cell and is beneficial for the miniaturization design of the battery cell. Attached Figure Description

[0031] Figure 1 is a schematic diagram of the structure of the cell monitoring module in one embodiment of this application;

[0032] Figure 2 is an exploded view of the cell monitoring module in the embodiment of Figure 1;

[0033] Figure 3 is a schematic diagram of the structure of the battery cell in one embodiment of this application. Detailed Implementation

[0034] The solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments in this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0035] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0036] It should also be noted that when a component is described as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component present. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component present.

[0037] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0038] In the power battery packs of electric vehicles, the cell monitoring module plays a crucial role. Since electric vehicle battery packs typically consist of multiple cells, the performance and state of each cell directly affect the overall performance and safety of the battery pack. By collecting status information such as voltage, temperature, and pressure from the cells through the cell monitoring module for monitoring and early warning, it helps ensure the battery pack operates safely and stably under complex conditions.

[0039] This application provides a battery cell monitoring module 100, which can be applied to battery cells to monitor the working status of the battery cells by collecting the status information of the battery cells (such as voltage, temperature, pressure, etc.).

[0040] Referring to Figures 1 and 2, Figure 1 is a structural schematic diagram of the cell monitoring module 100 in one embodiment of this application, and Figure 2 is an exploded view of the cell monitoring module 100 in the embodiment of Figure 1:

[0041] The battery cell monitoring module 100 includes a battery cell acquisition board 110 and an antenna 120;

[0042] The battery cell acquisition board 110 includes a substrate 111 and an acquisition device 112 disposed on the substrate 111;

[0043] Antenna 120 is disposed on substrate 111 and covers acquisition device 112. Antenna 120 is electrically connected to battery cell acquisition board 110 and is used to transmit performance data acquired by battery cell acquisition board 110 to external devices.

[0044] In the battery cell acquisition board 110, the substrate 111 can be a circuit board with an upper surface and a lower surface facing away from each other. The acquisition device 112 is mounted on the upper surface of the substrate 111. Furthermore, the upper surface of the substrate 111 can be provided with corresponding circuitry for transmitting and processing the signal data acquired by the acquisition device 112. The acquisition device 112 can be of various types, such as a temperature sensor, a pressure sensor, and components for voltage acquisition, to correspondingly acquire the battery cell's temperature, pressure, voltage, and other status information. Moreover, one or more acquisition devices 112 can be provided; this embodiment does not limit this.

[0045] The antenna 120 is integrated on the substrate 111 of the battery cell acquisition board 110. Specifically, the antenna 120 is located on the surface of the substrate 111 where the acquisition device 112 is located, is electrically connected to the battery cell acquisition board 110, and simultaneously covers the acquisition device 112. The antenna 120 can adopt a metal structure and be fixed to the substrate 111 by means of welding or other methods.

[0046] The antenna 120 is generally hood-shaped, which can cover the data acquisition device 112 on the substrate 111. It can also be called a hood-shaped antenna, cover-shaped antenna, etc., as long as it achieves the covering function. The outline shape of the antenna 120 can be the same as the outline shape of the substrate 111. For example, if the substrate 111 is square, the outline of the antenna 120 can be designed accordingly to be square. In this way, the antenna 120 can provide relatively comprehensive coverage of the devices and circuits on the substrate 111. To facilitate heat dissipation, there is a gap between the antenna 120 and the data acquisition device 112 on the substrate 111 to reserve heat dissipation space. The heat generated by the data acquisition device 112 during operation can be dissipated into the heat dissipation space. Optionally, when the antenna 120 is mounted on the substrate 111, a heat dissipation gap is formed between the antenna 120 and the substrate 111 to allow the heat generated by the data acquisition device 112 to dissipate outwards.

[0047] The main functions of antenna 120 include:

[0048] First, the performance data collected by the cell acquisition board 110 is transmitted to external devices (such as the main control board of the battery module) to realize wireless BMS communication;

[0049] Second, the acquisition device 112 of the battery cell acquisition board 110 is structurally covered to achieve anti-collision protection.

[0050] In this embodiment, the battery cell monitoring module 100 uses an antenna 120 mounted on the substrate 111 of the battery cell acquisition board 110 to cover the acquisition device 112 on the substrate 111, thereby providing mechanical protection for the acquisition device 112. This prevents the acquisition device 112 from being directly impacted, reducing the probability of damage and thus reducing the failure risk of the wireless BMS. Furthermore, the integrated mounting of the antenna 120 and the substrate 111 of the battery cell acquisition board 110 reduces the space occupied by the battery cell, which is beneficial for the miniaturization design of the battery cell.

[0051] In some embodiments, as shown in FIG2, the antenna 120 includes an antenna body 121 and a plurality of support feet 122 disposed along the periphery of the antenna body 121. The antenna body 121 covers the acquisition device 112, and the plurality of support feet 122 are welded to the substrate 111.

[0052] In antenna 120, multiple support feet 122 are integrally formed with antenna body 121. Antenna body 121 is plate-shaped, and the support feet 122 are located around the periphery of antenna body 121 and perpendicular to it. Antenna 120 is welded to substrate 111 via multiple support feet 122 to fix it to substrate 111, and antenna body 121 covers the acquisition device 112 from above. Specifically, in the circumferential direction of antenna body 121, multiple support feet 122 are evenly arranged along the periphery of antenna body 121, and the spacing between any two adjacent support feet 122 is approximately equal, which can form a stable support for antenna body 121, and correspondingly, allow antenna 120 to be firmly mounted on substrate 111. Optionally, antenna body 121 is square, and four support feet 122 are provided, with the four support feet 122 respectively located at the four corners of antenna body 121. In addition, when installing the antenna 120, the support foot 122 can be soldered to the substrate 111, thereby fixing the antenna 120 to the substrate 111. If the antenna 120 malfunctions, it can be removed with a soldering iron for maintenance and repair.

[0053] In some embodiments, as shown in FIG2, the end of the support foot 122 away from the antenna body 121 is provided with an inwardly bent welding portion 122A, which is used for welding to the substrate 111. Specifically, the support foot 122 has an upper end and a lower end opposite to each other. The upper end of the support foot 122 is connected to or integrally formed with the antenna body 121, and the lower end of the support foot 122 is away from the antenna body 121 and is provided with a welding portion 122A, which is bent toward the covering space of the antenna body 121. A pad adapted to the welding portion 122A may be provided on the substrate 111. When the support foot 122 is welded to the substrate 111, it is welded to the pad on the substrate 111 through its welding portion 122A. The support foot 122 is welded to the substrate 111 through the provided welding part 122A, which can ensure sufficient welding area, thereby improving mechanical strength and electrical performance. In addition, the welding part 122A is bent inward, which does not occupy the additional installation area of ​​the substrate 111, thus avoiding the substrate 111 from being too large and contributing to the overall compact and miniaturized design of the module.

[0054] In some embodiments, the substrate 111 is provided with signal transmission lines, and at least one of the plurality of support feet 122 is electrically connected to the signal transmission lines to electrically connect the antenna 120 to the battery cell acquisition board 110. Specifically, the performance data acquired by the battery cell acquisition board 110 is transmitted to the support feet 122 via the signal transmission lines on the substrate 111, and then transmitted to the antenna body 121 via the support feet 122, and finally transmitted to an external device. That is, in addition to providing support for the antenna installation, the support feet 122 are also used for communication connection with the battery cell acquisition board 110.

[0055] In some embodiments, as shown in FIG2, at least one side of the antenna body 121 is provided with a bent portion 123, which extends toward the substrate 111. Taking a square antenna body 121 as an example, the antenna body 121 has four sides, and at least one of the four sides is provided with a bent portion 123, which extends toward the direction of the substrate 111, with an extension length less than the length of the support leg 122. Preferably, all four sides are provided with bent portions 123. The bent portions 123 are bent at the sides of the antenna body 121 and extend toward the substrate 111, which can cover the acquisition device 112 from the side. The antenna 120, through the provided bent portions 123, can enhance the covering effect on the acquisition device 112 on the substrate 111, thereby improving the protection of the acquisition device 112.

[0056] In some embodiments, as shown in Figures 1 and 2, an opening K is constructed on the antenna 120 to broaden the bandwidth. The opening K extends through the antenna 120. The number and shape of the openings K can be set according to actual design requirements, and this embodiment does not limit this.

[0057] The antenna 120, through the provided opening K, can improve impedance matching, broaden bandwidth, increase signal transmission efficiency, enhance anti-interference capability, and improve communication reliability.

[0058] In some embodiments, as shown in FIG2, the opening K is L-shaped, and one end of the opening K extends to the edge of the antenna 120.

[0059] The L-shaped opening K on antenna 120 alters the current path on the surface, improving current distribution. For example, current flowing continuously along the antenna edge will be redirected around the L-shaped opening. This improved current distribution allows the antenna's input impedance to approach the characteristic impedance of the feed line, reducing reflection loss and improving signal transmission efficiency. Furthermore, the L-shaped opening introduces additional resonant modes. When antenna 120 is operating, in addition to the original main resonant mode, the new resonant modes generated by the L-shaped opening will, to some extent, superimpose with the main resonant mode. This superposition effect allows the antenna to maintain good radiation performance over a wider frequency range, increasing the antenna's bandwidth.

[0060] Referring to Figure 3, which is a schematic diagram of the battery cell structure in one embodiment of this application:

[0061] This application also proposes a battery cell, which includes a battery cell body 200 and a battery cell monitoring module 100 for collecting battery cell performance data. The battery cell monitoring module 100 is the battery cell monitoring module 100 described in the foregoing embodiments.

[0062] The specific structure of the cell monitoring module 100 is as described in the above embodiments. Since this cell adopts all the technical solutions of all the above embodiments, it has at least all the technical effects brought about by the technical solutions of the above embodiments, and will not be described in detail here. Specifically, the cell monitoring module 100 collects the cell's status information (such as voltage, temperature, pressure, etc.) to monitor the cell's working status.

[0063] In some embodiments, the battery cell further includes a top cover 300, which is located on top of the battery cell body 200, and the top cover 300 is provided with a positive terminal 310 and a negative terminal 320.

[0064] The cell monitoring module 100 is located on the top cover 300. The cell monitoring module 100 is electrically connected to the positive terminal 310 and the negative terminal 320 through the acquisition line X, which is embedded in the top cover 300.

[0065] In the battery cell, a battery cell monitoring module 100 is mounted on a top cover 300 and electrically connected to the positive terminal 310 and negative terminal 320 on the top cover 300 via a data acquisition line X. Specifically, the data acquisition line X includes a first data acquisition line and a second data acquisition line. The battery cell acquisition board 110 of the battery cell monitoring module 100 is electrically connected to the positive terminal 310 via the first data acquisition line and to the negative terminal 320 via the second data acquisition line. Voltage data at the positive terminal 310 and negative terminal 320 can be transmitted to the battery cell acquisition board 110 via the data acquisition line X. The battery cell acquisition board 110 processes the acquired voltage data to generate battery cell performance data, which is then transmitted to an external device via an antenna 120. The data acquisition line X is embedded in the top cover 300, making it less prone to breakage or damage and ensuring the stability of signal data transmission.

[0066] This application also proposes a battery module, which includes:

[0067] Box;

[0068] The main control board is located within the enclosure;

[0069] Multiple battery cells, as described in the aforementioned embodiments, are arranged inside the housing, and the antennas 120 of the multiple battery cells are communicatively connected to the main control board.

[0070] The specific structure of the battery cell is as described in the above embodiments. Since this battery module adopts all the technical solutions of all the above embodiments, it has at least all the technical effects brought about by the technical solutions of the above embodiments, and will not be described in detail here.

[0071] The above description is only a part or preferred embodiment of this application. Neither the text nor the drawings should limit the scope of protection of this application. All equivalent structural transformations made using the content of this application's specification and drawings under the overall concept of this application, or direct / indirect applications in other related technical fields, are included within the scope of protection of this application.

Claims

1. An electric cell monitoring module, wherein, include: A battery cell acquisition board includes a substrate and acquisition devices disposed on the substrate; An antenna is disposed on the substrate and covers the acquisition device. The antenna is electrically connected to the battery cell acquisition board and is used to transmit the performance data acquired by the battery cell acquisition board to an external device.

2. The cell monitoring module of claim 1, wherein, The antenna includes an antenna body and a plurality of support feet arranged along the periphery of the antenna body. The antenna body covers the acquisition device, and the plurality of support feet are welded to the substrate.

3. The cell monitoring module of claim 2, wherein, The antenna body is plate-shaped, and the support feet are located on the periphery of the antenna body and perpendicular to it. Multiple support feet are evenly arranged along the periphery of the antenna body, and the distance between any two adjacent support feet is equal.

4. The cell monitoring module of claim 3, wherein, The end of the support foot away from the antenna body has an inwardly bent welding portion, which is used for welding to the substrate.

5. The cell monitoring module of claim 4, wherein, The support foot has an upper end and a lower end. The upper end of the support foot is connected to the antenna body or integrally formed therein, and the lower end of the support foot is away from the antenna body and has the welded part.

6. The cell monitoring module of claim 5, wherein, The substrate is provided with solder pads that are adapted to the welding part, and the solder pads are used to ensure that the substrate has sufficient welding area to weld to the welding part.

7. The cell monitoring module of claim 3, wherein, The substrate is provided with a signal transmission line, and at least one of the plurality of support feet is electrically connected to the signal transmission line so that the antenna is electrically connected to the battery cell acquisition board.

8. The cell monitoring module of claim 3, wherein, At least one side of the antenna body has a bent portion.

9. The cell monitoring module of claim 8, wherein, The bent portion extends toward the direction of the substrate, and the extension length is less than the length of the support leg.

10. The cell monitoring module of claim 1, wherein, The antenna has openings constructed to widen the bandwidth.

11. The cell monitoring module of claim 10, wherein, The opening is L-shaped, and one end of the opening extends to the edge of the antenna.

12. The cell monitoring module of claim 1, wherein, The acquisition devices can be of various types, such as temperature sensors, pressure sensors, and components for voltage acquisition, used to acquire status information such as temperature, pressure, and voltage of the battery cell.

13. An electric cell, wherein, The device includes a battery cell body and a battery cell monitoring module for collecting performance data of the battery cell, wherein the battery cell monitoring module is the battery cell monitoring module as described in any one of claims 1 to 12.

14. The electric cell of claim 13, wherein, It also includes a top cover, which is located on top of the battery cell body, and the top cover is provided with a positive terminal and a negative terminal; The cell monitoring module is located on the top cover. The cell monitoring module is electrically connected to the positive terminal and the negative terminal respectively through a data acquisition line, which is embedded in the top cover.

15. A battery module, wherein, include: Box; The main control board is located in the enclosure; Multiple battery cells as described in claim 13 or 14 are arranged in the housing, and the antennas of the multiple battery cells are communicatively connected to the main control board.

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