Single-cell intelligent end cover and battery pack

Abstract

The utility model provides a single-cell intelligent end cover and a battery pack. The single-cell intelligent end cover comprises a cover plate, a positive pole column, a negative pole column and a monitoring circuit board, wherein the positive pole column and the negative pole column are arranged on the cover plate. The monitoring circuit board is electrically connected with the positive pole and the negative pole, so that power supply of the monitoring circuit board is realized, the monitoring circuit board can accurately monitor and manage a single battery cell and wirelessly communicate with an external battery cell management system, communication in a traditional wire harness mode is not needed, and the problems of potential safety hazards and the like caused by wire harness aging are avoided. The battery pack comprises a plurality of battery cells, when the battery pack is abnormal, the abnormal battery cells can be accurately positioned through the monitoring circuit boards installed on the battery cells, convenience and rapidness are achieved, and the detection efficiency of the battery pack is improved.

Description

Technical Field

[0001] This application belongs to the field of battery processing technology, and relates to a cell manufacturing technology, particularly to a single-cell smart end cap and battery pack. Background Technology

[0002] Battery cells and BMS (Battery Management System) are the core of the battery pack industry chain. The BMS system monitors, directs, and coordinates the battery cells in the battery module. Compared with mobile phone batteries, power batteries in automobiles, aircraft, etc., mostly use modular batteries with a large number of cells connected in series and parallel, which places high demands on automotive BMS systems.

[0003] In existing technologies, the BMS system is typically connected to the battery pack via wiring harnesses and connectors. However, a battery pack usually contains multiple cells, and monitoring the entire battery pack makes it impossible to pinpoint the specific cell causing the malfunction, which can be inconvenient for inspection or replacement. Furthermore, communication via wiring harnesses is susceptible to aging; aging wiring harnesses can pose safety hazards, require frequent maintenance, and are difficult to repair.

[0004] Therefore, accurately locating abnormal battery cells and achieving secure communication between the battery cells and the BMS system is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this application is to provide a single-cell smart end cap and battery pack to solve the problems that existing BMS systems cannot accurately locate abnormal cells, and that the wiring harness used for communication between the BMS system and the battery pack is prone to aging and causing safety hazards.

[0006] In a first aspect, this application provides a single-cell smart end cap, which is disposed on the outer shell of the cell and electrically connected to the cell. The single-cell smart end cap includes: a cover plate and a positive terminal, a negative terminal and a monitoring circuit board disposed on the cover plate.

[0007] The monitoring circuit board includes a cell monitoring chip and peripheral circuits connected to the cell monitoring chip to assist the cell monitoring chip in measuring cell parameters; the cell monitoring chip includes a wireless communication module.

[0008] The monitoring circuit board is electrically connected to the positive and negative terminals respectively. The battery cell monitoring chip is powered by the battery cell and performs monitoring and management of the battery cell.

[0009] In this application, a monitoring circuit board mounted on the smart end cap of a single battery cell is connected to the positive and negative terminals to supply power to the cell monitoring chip. Because the monitoring chip monitors and manages individual cells, it can accurately locate the faulty cell when the battery pack malfunctions, improving the convenience and practicality of battery pack monitoring and management. Furthermore, since the monitoring circuit board communicates with the external battery management system via a wireless communication module, no additional wiring harness is required for wired communication, avoiding safety hazards caused by aging wiring harnesses and improving the safety of cell monitoring and management.

[0010] In one embodiment of this utility model, the monitoring circuit board further includes:

[0011] The flexible circuit board electrically connected to the positive and negative terminals, and the printed circuit board soldered on the flexible circuit board, are designed so that the structure of the monitoring circuit board is not limited by the positional relationship between the positive and negative terminals, which simplifies the structure of the single-cell smart end cap and makes it easy to solder.

[0012] Both the battery cell monitoring chip and the peripheral circuit are mounted on the printed circuit board. Since flexible circuit boards are generally not used to integrate complex circuits, the battery cell monitoring chip and the peripheral circuit, which have complex components and circuit structures, are mounted on a rigid printed circuit board. This allows the monitoring circuit board to achieve better battery cell monitoring and management while simplifying its structure.

[0013] In one embodiment of this utility model, the cell monitoring chip includes: a control module and a signal acquisition module, a voltage regulation module, and a storage module connected to the control module; the control module is also connected to the wireless communication module; through the various modules on the cell monitoring chip, the voltage, current, and temperature of the cell can be monitored and regulated, and communication with an external battery management system can be established to realize cell management and abnormal cell location.

[0014] In one embodiment of the present invention, the single-cell smart end cap further includes a first busbar electrically connected to the positive terminal and a second busbar electrically connected to the negative terminal;

[0015] The first busbar is a conductive strip that extends outside the cover plate and is electrically connected to the negative terminal of other battery cells; the second busbar is a conductive strip that extends outside the cover plate and is electrically connected to the positive terminal of other battery cells.

[0016] The width of the first busbar is not less than that of the positive terminal, and the width of the second busbar is not less than that of the negative terminal.

[0017] The busbar allows for the series connection of individual cells within the battery pack, facilitating the output voltage of the battery pack.

[0018] In one embodiment of this utility model, one end of the monitoring circuit board is soldered to the first busbar, and the other end of the monitoring circuit board is soldered to the second busbar. Since the first and second buses have a relatively large width, soldering the monitoring circuit board onto them is more convenient and faster.

[0019] In one embodiment of the present invention, the monitoring circuit board is soldered above the first busbar and the second busbar; or, the monitoring circuit board is soldered below the first busbar and the second busbar.

[0020] In one embodiment of this invention, a nickel sheet for soldering is provided at each end of the monitoring circuit board. Laser soldering the monitoring circuit board using two nickel sheets is efficient and yields good soldering results.

[0021] In one embodiment of this utility model, the single-cell smart end cap further includes a gas valve disposed on the cover plate. The gas valve is used to discharge the gas generated when thermal runaway occurs inside the cell, so as to avoid excessive temperature and gas pressure inside the cell leading to an explosion.

[0022] In one embodiment of this utility model, the components of the peripheral circuit include resistors, capacitors, and field-effect transistors.

[0023] Secondly, this application provides a battery pack including at least two battery cells; the battery includes a single-cell smart end cap as described above, and all the battery cells are connected in series through a busbar disposed on the single-cell smart end cap.

[0024] In this application, multiple battery cells are connected in series via a busbar to form a battery pack. Because the smart end caps of the battery cells within the battery pack are equipped with cell monitoring chips, monitoring and management of each cell within the pack can be achieved, and wireless communication with an external battery management system is possible. This eliminates the need for wired communication via wiring harnesses, avoiding safety hazards caused by aging wiring harnesses. Furthermore, since the monitoring circuit board is located inside the battery pack, it occupies minimal space, achieving a high degree of integration and contributing to the miniaturization of the entire power system.

[0025] As described above, this application provides a single-cell smart end cap and battery pack. By integrating a cell monitoring chip onto the single-cell smart end cap, it enables monitoring and management of individual cells. This allows for accurate location of abnormal cells when the battery pack malfunctions, improving the convenience and practicality of cell monitoring and management. Furthermore, since the cell monitoring chip can communicate wirelessly with an external battery management system, wired communication via wiring harnesses is unnecessary, avoiding safety hazards caused by aging wiring harnesses and enhancing the security of telecommunications monitoring and management. The individual cells within the battery pack are connected in series via a busbar, outputting the superimposed voltage of multiple cells, which can meet the power system requirements of automobiles, aircraft, and other applications. Moreover, the highly integrated functionality of the battery pack facilitates the miniaturization of power systems. Attached Figure Description

[0026] Figure 1 The diagram shown is a schematic diagram of the single-cell smart end cap connected to the monitoring circuit board according to an embodiment of this application.

[0027] Figure 2 The diagram shown is a schematic diagram of the monitoring circuit board described in an embodiment of this application.

[0028] Figure 3 The diagram shown is an equivalent circuit diagram of the cell monitoring chip for monitoring a single cell as described in an embodiment of this application.

[0029] Figure 4 The diagram shown is a schematic diagram of the cell connection structure described in an embodiment of this application.

[0030] Figure 5 The diagram shown is a schematic representation of the battery pack structure described in an embodiment of this application.

[0031] Component designation explanation

[0032] 100 battery pack

[0033] 10-cell smart end cap

[0034] 11 Positive terminal

[0035] 12 Negative terminal

[0036] 13 Monitoring circuit boards

[0037] 14 Cover plate

[0038] 15 busbars

[0039] 16 air valves

[0040] 101 Single-cell equivalent power supply

[0041] 102 Battery Cell Monitoring Chip

[0042] 131 Printed Circuit Board

[0043] 132 Flexible Circuit Board

[0044] 133 nickel sheet

[0045] 151 First busbar

[0046] 152 Second busbar Detailed Implementation

[0047] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. This application can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, unless otherwise specified, the following embodiments and features in the embodiments can be combined with each other.

[0048] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. Therefore, the drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0049] This application provides a single-cell smart end cap and battery pack according to the following embodiments. A single cell is the smallest unit of a battery system. Multiple cells connected in series can form a battery pack, and one or more battery packs can form a power system to supply power to devices. It should be noted that, for example, the power systems of electric vehicles and aircraft require more cells to store more electrical energy. Therefore, in order to manage, control, and coordinate a large number of cells, it is necessary to connect the cells to an external battery management system. Specifically, by collecting parameters such as current, voltage, and temperature of the cells and sending them to the external battery management system, the cells can be monitored and managed. The single-cell smart end cap and battery pack provided in the following embodiments of this application can accurately locate abnormal cells and do not pose safety hazards such as aging wiring harnesses.

[0050] The following will describe in detail the principle and implementation of a single-cell smart end cap and battery pack according to the present embodiment with reference to the accompanying drawings, so that those skilled in the art can understand the single-cell smart end cap and battery pack of the present embodiment without creative effort.

[0051] like Figure 1As shown, this embodiment provides a single-cell smart end cap 10, including: a cover plate 14, a positive terminal 11 and a negative terminal 12 disposed on the cover plate, and a monitoring circuit board 13. The cover plate 14 is disposed on the cell and is part of the cell's outer casing. The cell casing stores the energy storage material inside; for example, for a lithium-ion cell, it stores high-purity organic solvents, lithium electrolyte salts, and some necessary additives. The positive terminal 11 and negative terminal 12 serve as the positive and negative electrodes of the cell, respectively. They can be disposed at both ends of the cover plate 14 or at other locations on the cover plate 14 to facilitate the outlining of the positive and negative electrodes. This embodiment does not impose specific limitations. The monitoring circuit board 13 is provided with a cell monitoring chip 102, with its two ends electrically connected to the positive terminal 11 and the negative terminal 12, respectively. Specifically, conductive sheets or conductive blocks (not shown in the figure) can be soldered onto the positive terminal 11 and the negative terminal 12, and the two ends of the monitoring circuit board 13 are soldered onto the conductive sheets or conductive blocks to achieve electrical connection. The battery cell supplies power to the battery cell monitoring chip 102, which is used to monitor and manage the individual battery cells connected to it.

[0052] like Figure 2 As shown, the monitoring circuit board 13 includes a printed circuit board 131, a flexible circuit board 132, and two nickel plates 133. The printed circuit board 131 is connected to the flexible circuit board 132 by soldering or other fixed electrical connections. The two ends of the flexible circuit board 132 are electrically connected to the positive terminal 11 and the negative terminal 12 through the nickel plates 133.

[0053] The flexible circuit board 132 is a flexible circuit board that is relatively thin and light, and can be bent at will. The positive terminal 11 and negative terminal 12 of the battery cell are connected through the flexible circuit board. Because the flexible circuit board 132 can be flexed, the design of the monitoring circuit board 13 is more flexible and the soldering process is more convenient. It is not limited by the positional relationship between the positive terminal 11 and the negative terminal 12, so the monitoring circuit board 13 does not need to be designed with a complex structure. It can be installed on battery cells with various shapes and structures as well as positive terminal 11 and negative terminal 12, making it more versatile. It also simplifies the structure of the single-cell smart end cap 10. At the same time, the flexible material is easier to solder, improving efficiency and saving costs.

[0054] It should be noted that, generally speaking, the flexible circuit board 132 is not used to integrate complex circuits. Therefore, the circuit components and complex circuit structure contained in the cell monitoring chip 102 need to be integrated on the rigid printed circuit board 131. The printed circuit board 131 is soldered to the flexible circuit board 132 via pads, ultimately allowing the cell monitoring chip 102 to be electrically connected to the positive terminal 11 and negative terminal 12 of the cell, so as to realize the power supply from the cell to the cell monitoring chip 102 and the monitoring chip 102 to monitor and manage individual cells. By combining the use of the printed circuit board 131 and the flexible circuit board 132, the structure of the monitoring circuit board 13 is simplified and its size is smaller. It realizes the functional integration of the cell monitoring chip 102 and can be placed on the cover plate 14, enabling direct monitoring and management of individual cells. It does not require connecting the cells to an external BMS system through wiring harnesses, saving space costs and eliminating safety hazards such as wiring harness aging.

[0055] Specifically, the cell monitoring chip 102 is equipped with a control module and functional modules such as a wireless communication module, a signal acquisition module, a voltage regulation module, and a storage module connected to the control module, so as to sample and store the electrical signals of the cell, communicate with the external battery monitoring system through wireless communication, and further perform the functions of cell voltage equalization and abnormal cell location.

[0056] It should be noted that peripheral circuitry is also provided on the printed circuit board 131. This peripheral circuitry forms the necessary auxiliary circuitry for cell monitoring and management, assisting the cell monitoring chip 102 in measuring cell parameters and further adjusting the cell's output voltage. Specifically, the peripheral circuitry includes one or more circuit devices such as resistors, capacitors, and field-effect transistors.

[0057] The monitoring circuit board 13 also includes two nickel plates 133, disposed at both ends of the flexible circuit board 132, for laser welding to achieve electrical connection between the flexible circuit board 132 and the positive and negative terminals 11 and 12 of the battery cell. Specifically, the nickel plates 133 are welded together with conductive sheets and conductive blocks connecting the positive and negative terminals 11 and 12 of the battery cell, thus achieving electrical connection between the flexible circuit board 132 and the positive and negative terminals 11 and 12 of the battery cell. It should be noted that the flexible circuit board 132 can also achieve electrical connection with the positive and negative terminals 11 and 12 of the battery cell in other ways, for example, by soldering to the conductive sheets and conductive blocks on the positive and negative terminals 11 and 12 of a single battery cell. Preferably, the flexible circuit board 132 is laser welded using nickel plates 133, which is fast, efficient, and produces good welding results.

[0058] The cell monitoring chip 102 is electrically connected to the positive terminal 11 and negative terminal 12 of the cell via the monitoring circuit board 13, enabling monitoring and management of the cell. It should be noted that the battery pack 100 generally contains multiple cells, but the cell monitoring chip 102 in this embodiment only monitors and manages a single cell. Specifically, as... Figure 3 As shown, the multiple cells within the battery pack 100 can be equivalent to multiple power sources connected in series. Each cell monitoring chip 102 is connected to the positive and negative terminals of a single-cell equivalent power source 101, enabling the acquisition of parameters such as voltage, current, temperature, and remaining charge of that cell. Based on this, this embodiment, by placing the cell monitoring chip 102 on the single-cell smart end cover 10 and electrically connecting it to the positive terminal 11 and the negative terminal 12, enables the cell monitoring chip 102 to acquire signals from individual cells. Through wireless communication, when an abnormality occurs in the battery pack, the abnormal cell can be located by the signal of each cell, improving accuracy. When a cell malfunctions, it can be directly repaired or replaced, making it more convenient and beneficial for the practical application of cell monitoring and management.

[0059] Multiple battery cells can be connected in series to form a battery pack of 100, specifically, such as Figure 4 As shown, this is achieved through a busbar set on the single-cell smart end cover 10. The busbar is a conductive strip. Specifically, the length of the busbar is not less than the width of the cover plate 14, so that one end of the busbar is welded to the terminal post, and the other end extends out of the cover plate to facilitate connection with another cell terminal post, thereby realizing series connection between cells. It should be noted that the busbar length given in this embodiment is based on the case where the positive terminal post 11 and the negative terminal post 12 of the cell are set at both ends of the square cover plate 14; when the shape of the cover plate 14 is different, or the positional relationship between the positive terminal post 11 and the negative terminal post 12 is different, the specific shape and length of the busbar can also be changed accordingly, as long as the series connection between multiple cells can be realized. For a specific cell in the battery pack 100, the positive terminal 11 of this cell is electrically connected to the first bus 151, and through the first bus 151, it is electrically connected to the negative terminal of the next cell. The negative terminal 12 of this cell is electrically connected to the second bus 152, and through the second bus 152, it is electrically connected to the positive terminal of the previous cell. Based on this, the cells in the battery pack 100 can be connected in series via the busbars. The negative terminal of the first cell and the positive terminal of the last cell in the battery pack 100 are not connected to other cells; the voltage of the battery pack 100 can be output through these two terminals. It should be noted that for a certain cell in the battery pack 100, the positive terminal 11 of the cell can also be electrically connected to the negative terminal of the previous cell through the first bus 151, and the negative terminal 12 can be electrically connected to the positive terminal of the next cell through the second bus 152. At this time, the voltage of the battery pack 100 can be output through the positive terminal of the first cell and the negative terminal of the last cell in the battery pack 100.

[0060] It should be noted that the busbar has a certain width, generally not less than that of the terminal post. By soldering the monitoring circuit board 13 onto the busbar, the monitoring circuit board 13 can be electrically connected to the positive terminal post 11 and the negative terminal post 12. Specifically, the flexible circuit board 132 can be laser-soldered to the top of the busbar using a nickel sheet 133, or it can be laser-soldered to the bottom of the busbar using a nickel sheet 133, to achieve the electrical connection between the monitoring circuit board 13 and the positive terminal post 11 and the negative terminal post 12.

[0061] Furthermore, the single-cell smart end cap 10 provided in this embodiment is also equipped with a gas valve 16. The gas valve 16 is disposed on the cover plate 14 and is used for pressure balancing and pressure relief. When thermal runaway occurs inside the cell, the gas valve 16 opens to allow the expanding gas to escape, immediately releasing pressure and helping to prevent further damage to the remaining battery, avoiding the risk of explosion due to excessive internal pressure and temperature of the cell. At the same time, for cells that store electrolyte inside, the gas valve 16 can only allow gas to pass through and not liquid, and can prevent water and contaminants from entering the cell. Generally, the gas valve 16 can be located at the center of the cover plate 14 to facilitate the discharge of gas inside the cell, or the gas valve 16 can also be located at other positions on the cover plate 14.

[0062] It should be noted that since the flexible circuit board 132 on the single-cell smart end cap 10 is soft, it will not obstruct the process of gas discharge from the single cell; or, the monitoring circuit board 13 located directly above the gas valve 16 can be designed as an arched structure so that the gas can be discharged smoothly without obstruction.

[0063] This embodiment provides a single-cell smart end cap 10. By connecting a monitoring circuit board between the positive terminal 11 and the negative terminal 12, it enables monitoring and management of a single cell. When an abnormality occurs within the battery pack 100, it can accurately obtain information about the abnormal cell and perform repair or replacement, making it more convenient and improving the efficiency of monitoring and management of the battery pack 100. At the same time, the cell monitoring chip 102 is set on the printed circuit board 131 and communicates wirelessly with an external battery management system. Compared with traditional wired communication, the wireless communication in this embodiment does not require wiring harness connections, avoiding safety hazards caused by wiring harness aging. The flexible circuit board 132 is soft and bendable, so the design of the monitoring circuit board 13 is not limited by the positional relationship of the positive terminal 11 and the negative terminal 12. It does not require a complex structural design for the monitoring circuit board 13, saving costs and space within the battery pack 100.

[0064] like Figure 5As shown, this application also provides a battery pack 100, including multiple battery cells. Each battery cell has a single-cell smart end cap 10 with: a cover plate 14 for sealing the battery cell; a positive terminal 11 and a negative terminal 12 disposed on the cover plate for outputting the battery cell voltage; an air valve 16 disposed on the cover plate 14 for stabilizing the internal and external pressure balance and releasing pressure; and a busbar 15 for connecting different battery cells in series. Specifically, the positive terminal of the previous battery cell is connected to the negative terminal of the next battery cell through the busbar 15, or the negative terminal of the previous battery cell is connected to the positive terminal of the next battery cell through the busbar 15, to form the entire battery pack 100, and finally outputs the voltage of the battery pack 100 through the remaining terminals of the first and last battery cells that are not connected to other battery cells.

[0065] The battery pack 100 also includes a monitoring circuit board 13 electrically connected to the positive terminal 11 and negative terminal 12 of each individual battery cell. Specifically, the monitoring circuit board is provided with nickel strips 133, a flexible circuit board 132, and a printed circuit board 131. The monitoring circuit board is laser-welded to the busbar at both ends of the nickel strips 133 to achieve electrical connection between the monitoring circuit board 13 and the positive terminal 11 and negative terminal 12 of each individual battery cell. The printed circuit board 131 is provided with peripheral circuits and a cell monitoring chip 102 to monitor, manage, and regulate parameters such as voltage, current, and temperature of each individual battery cell, and transmit signals through a wireless communication module. It should be noted that... Figure 5 The example shows a monitoring circuit board 13 installed on one of the battery cells, but in fact, each battery cell in the battery pack 100 can be equipped with a corresponding monitoring circuit board 13 to achieve accurate monitoring and management of each battery cell in the battery pack 100. This will enable accurate location of abnormal battery cells when an abnormality occurs in the battery pack 100, improve the management effect, and make the battery cell monitoring and management more practical.

[0066] The process of monitoring and managing individual cells within the battery pack 100 will be described in detail below.

[0067] The battery pack 100 consists of multiple cells connected in series. The positive terminal 11 and negative terminal 12 of each cell are electrically connected to the monitoring circuit board 13, so that the cells can supply power to the monitoring circuit board 13, enabling the cell monitoring chip 102 on the monitoring circuit board 13 to work normally and monitor and manage the connected cells.

[0068] Specifically, the cell monitoring chip 102 is equipped with modules such as a wireless communication module, a signal acquisition module, a voltage regulation module, a control module, and a storage module. The signal acquisition module collects parameters such as voltage, current, and temperature of the cell and transmits them to the control module. The control module analyzes, processes, and packages the received signals, then sends them to an external battery management system via the wireless communication module and receives instructions from the external battery management system. Based on the received instructions, the control module uses the voltage regulation module to balance the cell's output voltage. When a cell malfunctions, the external battery monitoring system can accurately locate the malfunctioning cell by receiving signals from each cell, alerting the user and thus enabling cell monitoring and management. It should be noted that since the monitoring circuit board 13 is connected to both ends of a cell, the acquired signals are all from that single cell and do not involve signals from other cells. Therefore, it can achieve precise management of individual cells within the battery pack 100 and accurately locate the malfunctioning cell when the battery pack 100 malfunctions.

[0069] It should be noted that this embodiment exemplifies a square battery cell with the positive terminal 11 and negative terminal 12 disposed at one end of the cell, but it is not limited thereto. For example, the battery cell can be a cylindrical cell or other possible shapes; the cover plate 14 can be two parts disposed at both ends of the battery cell, with the positive terminal 11 and negative terminal 12 respectively disposed on two cover plates 14, or the cover plate 14 can be disposed at one end of the battery cell, with the positive terminal 11 and negative terminal 12 disposed on the same side of the cover plate 14. This embodiment does not impose specific limitations here.

[0070] The battery pack 100 provided in this embodiment can achieve precise monitoring and management of individual cells within the battery pack 100. At the same time, since the monitoring circuit board 13 is located inside the battery pack 100, the cell monitoring chip 102 transmits signals wirelessly. After the battery pack 100 is encapsulated, there is no need for additional wiring harnesses to connect to an external battery management system for wired communication. This makes the battery pack 100 highly integrated, which is beneficial for the management of the device's power system and the miniaturization of the battery device, and also avoids safety hazards caused by aging wiring harnesses.

[0071] The descriptions of the processes or structures corresponding to the above figures each have their own emphasis. For parts of a process or structure that are not described in detail, please refer to the relevant descriptions of other processes or structures.

[0072] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this application should still be covered by the claims of this application.

Claims

1. A single-cell smart end cap, disposed on the outer shell of the cell and electrically connected to the cell, characterized in that, include: The cover plate contains the positive terminal, negative terminal, and monitoring circuit board. The monitoring circuit board includes a cell monitoring chip and peripheral circuits connected to the cell monitoring chip to assist the cell monitoring chip in measuring cell parameters; the cell monitoring chip includes a wireless communication module. The monitoring circuit board is electrically connected to the positive terminal and the negative terminal, respectively.

2. The single-cell smart end cap according to claim 1, characterized in that, The monitoring circuit board also includes: A flexible circuit board electrically connected to the positive terminal and the negative terminal, and a printed circuit board soldered onto the flexible circuit board; Both the battery cell monitoring chip and the peripheral circuits are mounted on the printed circuit board.

3. The single-cell smart end cap according to claim 1, characterized in that, The battery cell monitoring chip includes: a control module and a signal acquisition module, a voltage regulation module, and a storage module respectively connected to the control module; the control module is also connected to the wireless communication module.

4. The single-cell smart end cap according to claim 1, characterized in that, It also includes a first busbar electrically connected to the positive terminal and a second busbar electrically connected to the negative terminal; The first busbar is a conductive strip that extends outside the cover plate and is electrically connected to the negative terminal of another battery cell; the second busbar is a conductive strip that extends outside the cover plate and is electrically connected to the positive terminal of another battery cell. The width of the first busbar is not less than that of the positive terminal, and the width of the second busbar is not less than that of the negative terminal.

5. The single-cell smart end cap according to claim 4, characterized in that, One end of the monitoring circuit board is soldered to the first busbar, and the other end of the monitoring circuit board is soldered to the second busbar.

6. The single-cell smart end cap according to claim 4, characterized in that, The monitoring circuit board is soldered above the first busbar and the second busbar; or, the monitoring circuit board is soldered below the first busbar and the second busbar.

7. The single-cell smart end cap according to claim 1, characterized in that, Each end of the monitoring circuit board has a nickel plate for soldering.

8. The single-cell smart end cap according to claim 1, characterized in that, It also includes an air valve installed on the cover plate.

9. The single-cell smart end cap according to claim 1, characterized in that, The components of the peripheral circuit include resistors, capacitors, and field-effect transistors.

10. A battery pack, characterized in that, It includes at least two battery cells; the battery includes a single-cell smart end cap as described in any one of claims 1-9, and all the battery cells are connected in series through a busbar disposed on the single-cell smart end cap.

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