Battery cell, battery pack and power utilization device

Abstract

The utility model provides a battery cell, a battery pack and an electric device, and relates to the technical field of batteries, the battery cell comprises a battery cell body, an air pressure detection piece, a strain detection piece and a data receiving device, the air pressure detection part is used for detecting air pressure in the battery cell body; the air pressure detection piece and the strain detection piece are connected with the battery cell body; the air pressure detection piece and the strain detection piece are connected with the data receiving device and used for receiving air pressure information data and strain information data. Therefore, the data receiving device can receive the air pressure information data and the strain information data. When the battery cell is used, the air pressure change condition in the battery cell body and the deformation condition of the battery cell can be monitored in real time, so that corresponding measures can be quickly taken according to actual conditions, and potential safety hazards caused by the air pressure change in the battery cell and the deformation of a battery cell shell during discharging of the battery cell can be avoided; therefore, the safety of the battery pack can be improved.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, specifically relating to a battery cell, a battery pack, and an electrical device. Background Technology

[0002] With the development of electric vehicles, battery packs have become an important automotive component. A battery pack generally consists of a casing and battery cells located inside the casing.

[0003] When a battery pack is working, the cells discharge, which causes changes in the internal air pressure of the cells and can deform the cell casing. When these changes in the cells are significant, they can pose a safety hazard to the battery pack. Utility Model Content

[0004] The purpose of this utility model embodiment is to provide a battery cell, battery pack, and power device that can solve the safety hazards caused by changes in internal air pressure and deformation of the battery cell shell during discharge in related technologies.

[0005] To solve the above-mentioned technical problems, this utility model is implemented as follows:

[0006] In a first aspect, this utility model provides a battery cell, comprising: a battery cell body, a pressure detection element, a strain detection element, and a data receiving device. The pressure detection element is connected to the outer surface of the battery cell body and is used to detect the pressure inside the battery cell body; the strain detection element is connected to the outer surface of the battery cell body; the data receiving device is connected to the outer surface of the battery cell body, and both the pressure detection element and the strain detection element are electrically connected to the data receiving device for receiving pressure information data and strain information data.

[0007] Optionally, the battery cell body is provided with a terminal post, and the side of the terminal post away from the battery cell body has a wiring surface;

[0008] The data receiving device includes a flexible circuit board, which includes a ribbon cable section and a flat plate structure; the ribbon cable section and the flat plate structure are electrically connected; the flat plate structure has a plate surface.

[0009] The plate surface is opposite to and in contact with the wiring surface, and the plate structure is used to detect the voltage of the pole.

[0010] Optionally, the wiring surface is a circular plane, the plate structure is a circular plate, the circular plane and the circular plate have the same diameter, and the plate surface of the circular plate is opposite to and in contact with the circular plane.

[0011] Optionally, the battery cell includes an insulating ring disposed on the outer side of the flat plate structure in the radial direction; the projection of the flat plate structure is located within the projection of the insulating ring in the axial direction of the flat plate structure.

[0012] The surface of the insulating ring that contacts the cell body is an insulating contact surface, and the surface of the flat plate structure that contacts the cell body is a conductive contact surface. The insulating contact surface protrudes a first distance away from the cell body relative to the conductive contact surface.

[0013] The surface of the battery cell body is provided with a boss, the terminal is installed in the boss, and the wiring surface protrudes towards the flat plate structure by a second distance relative to the boss; the absolute value of the difference between the first distance and the second distance is less than 0.5mm.

[0014] Optionally, the data receiving device includes a receiving module; the flexible circuit board and the strain detection element are both electrically connected to the receiving module, and the air pressure detection element is disposed on the surface of the receiving module near the battery cell body;

[0015] The receiving module, the cable section, and the connection surface are located on the same side of the battery cell body;

[0016] The battery cell also includes an insulating top cover that covers the ribbon cable section and exposes the receiving module and the wiring surface.

[0017] Optionally, the data receiving device further includes a strain information transmission line, which is attached to the surface of the battery cell body; a first end of the strain information transmission line is electrically connected to the receiving module, and a second end of the strain information transmission line is electrically connected to the strain detection element.

[0018] Optionally, the strain detection element is a strain gauge. ， The strain gauge is attached to the center of the first surface of the battery cell body and is used to detect changes in the stress of the battery cell body.

[0019] Optionally, the battery cell body is provided with a liquid injection hole; a sealing member is provided at the opening of the liquid injection hole, and the sealing member is detachably connected to the opening of the liquid injection hole;

[0020] The receiving module covers the outside of the sealing member and is connected to the surface of the battery cell body.

[0021] Optionally, an adhesive layer is provided between the receiving module and the surface of the battery cell body, the adhesive layer being used to connect the receiving module and the surface of the battery cell.

[0022] Optionally, the sealing member has a receiving groove at one end away from the battery cell body, and the bottom surface of the receiving groove has an air hole that connects the receiving groove and the interior of the battery cell body; when the receiving module is connected to the battery cell body, the air pressure detection member is housed in the receiving groove.

[0023] Secondly, this utility model embodiment also provides a battery pack, the battery pack including the battery cells described in any of the first aspects above.

[0024] Thirdly, this utility model embodiment also provides an electrical device, which includes the battery pack described in the second aspect above.

[0025] In this embodiment, the battery cell includes a pressure detection device. This device detects the pressure inside the battery cell and is connected to both the battery cell and a data receiving device to receive pressure information data. Thus, changes in the internal pressure of the battery cell can be detected by the pressure detection device, generating pressure information data, which can then be received by the data receiving device.

[0026] Next, since the battery cell includes strain gauges connected to the cell body and a data receiving device, it receives strain data. This allows the strain gauges to detect stress changes in the cell's outer casing and generate strain data, which the data receiving device then receives. When using this battery cell, real-time monitoring of internal pressure changes and cell deformation using both pressure and strain data allows for rapid implementation of appropriate measures. This helps prevent safety hazards caused by internal pressure changes and casing deformation during discharge, thus improving battery pack safety.

[0027] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more obvious and understandable, specific embodiments of this utility model are given below. Attached Figure Description

[0028] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0029] Figure 1 This is a schematic diagram of the structure of a battery cell provided in an embodiment of this utility model;

[0030] Figure 2 yes Figure 1A schematic diagram of the data receiving device in the diagram;

[0031] Figure 3 yes Figure 1 A schematic diagram of the structure of the battery cell body;

[0032] Figure 4 This is a schematic diagram of the air pressure detection component on the side of the receiving module closest to the battery cell body;

[0033] Figure 5 This is a schematic diagram of the first distance;

[0034] Figure 6 This is an enlarged view of the first distance diagram A;

[0035] Figure 7 This is a schematic diagram of the second distance;

[0036] Figure 8 This is an enlarged schematic diagram of the second distance B diagram;

[0037] Figure 9 This is a structural diagram of the first and second distances;

[0038] Figure 10 This is a structural schematic diagram of the sealing component;

[0039] Figure 11 This is a schematic diagram of the insulating top cover.

[0040] Figure 12 This is a schematic diagram of the CSU acquisition module;

[0041] Figure 13 This is a schematic diagram of the CSU module's operating mode.

[0042] Explanation of reference numerals in the attached figures:

[0043] 1-Cell body, 11-Terminal post, 111-Connecting surface, 12-Boss, 13-Injection hole, 14-Sealing component, 15-NTC thermistor, 141-Receiving groove, 1411-Air hole, 2-Air pressure detection component, 3-Strain detection component, 4-Data receiving device, 41-Flexible circuit board, 411-Cable section, 412-Plate structure, 4121-Plate surface of plate structure, 5-Insulating ring, 43-Receiving module, 44-Strain information transmission line, 6-Insulating top cover, 100-Cell. Detailed Implementation

[0044] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0045] The terms "first," "second," etc., used in the specification and claims of this utility model are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this utility model can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, the first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0046] The battery cell, battery pack, and power-consuming device provided in this utility model embodiment will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0047] Figure 1 This is a schematic diagram of the structure of a battery cell 100 provided in an embodiment of the present invention; Figure 2 yes Figure 1 A schematic diagram of the structure of the data receiving device 4 in the middle; Figure 3 yes Figure 1 Schematic diagram of the structure of the battery cell body 1;

[0048] Figure 4 This is a schematic diagram of the air pressure detection component on the side of the receiving module closest to the battery cell body; Figure 5 This is a schematic diagram of the first distance; Figure 6 This is an enlarged view of the first distance diagram A; Figure 7 This is a schematic diagram of the second distance;

[0049] Figure 8 This is an enlarged schematic diagram of the second distance B diagram; Figure 9 This is a structural schematic diagram of the sealing component; Figure 10 This is a schematic diagram of the insulating top cover; Figure 11 This is a schematic diagram of the CSU acquisition module.

[0050] See Figure 1 , Figure 2 and Figure 3The battery cell 100 includes: a battery cell body 1, a pressure detection element 2, a strain detection element 3, and a data receiving device 4. The pressure detection element 2 is connected to the outer surface of the battery cell body 1 and is used to detect the air pressure inside the battery cell body 1; the strain detection element 3 is connected to the outer surface of the battery cell body 1, and the data receiving device 4 is connected to the outer surface of the battery cell body 1. Both the pressure detection element 2 and the strain detection element 3 are electrically connected to the data receiving device 4 and are used to receive air pressure information data and strain information data.

[0051] In this embodiment, the battery cell 100 includes a pressure detection element 2, which is used to detect the air pressure inside the battery cell body 1. The pressure detection element 2 is connected to the battery cell body 1 and to a data receiving device 4 to receive air pressure information data. Thus, changes in air pressure inside the battery cell body 1 can be detected by the pressure detection element 2, generating air pressure information data, which the data receiving device 4 can then receive.

[0052] Next, since the battery cell 100 includes a strain detection element 3, which is connected to the battery cell body 1 and is also connected to the data receiving device 4, it is used to receive strain information data. In this way, the stress change of the outer shell of the battery cell body 1 can be detected by the strain detection element 3 and strain information data can be generated, which can be received by the data receiving device 4.

[0053] The aforementioned data receiving device 4 is connected to a controller. This controller can acquire the aforementioned air pressure information from the data receiving device 4 and compare it with standard air pressure data. When the air pressure information exceeds the standard air pressure data, an air pressure warning will be issued. Similarly, the controller can acquire the aforementioned strain information from the data receiving device 4 and compare it with standard strain data. When the strain information exceeds the standard strain data, a deformation warning will be issued. Thus, when using the battery cell 100, occupants can monitor the changes in air pressure inside the battery cell body 1 and the deformation of the battery cell 100 in real time. They can then quickly take appropriate measures based on the actual situation, thereby avoiding safety hazards caused by changes in internal air pressure and deformation of the battery cell 100's outer casing during discharge. Therefore, the safety of the battery pack can be improved.

[0054] In addition, the battery cell 100 also includes a temperature detection device, a voltage detection device, and a current detection device. The temperature detection device is electrically connected to the data acquisition device, the voltage detection device is electrically connected to the data acquisition device, and the current detection device is electrically connected to the data acquisition device. In this way, the data acquisition device can monitor the temperature, current, and voltage of the battery cell 100 in real time.

[0055] It should be noted that the above-mentioned air pressure detection element 2 can be a piezoresistive air pressure sensor, a capacitive air pressure sensor, or a microelectromechanical system air pressure sensor, or other air pressure detection elements 2 with the same function. This application embodiment does not limit this.

[0056] Alternatively, in some embodiments, see Figure 1 , Figure 2 Figure 3 ,and Figure 4 The battery cell body 1 is provided with a terminal post 11, and the side of the terminal post 11 away from the battery cell body 1 has a wiring surface 111; the data receiving device 4 includes a flexible circuit board 41, which includes a ribbon cable portion 411 and a flat plate structure 412; the ribbon cable portion 411 and the flat plate structure 412 are electrically connected; the flat plate structure 412 has a plate surface 4121; the plate surface 4121 is opposite to and in contact with the wiring surface 111, and the flat plate structure is used to detect the voltage of the terminal post.

[0057] It is understandable that the board surface 4121 and the wiring surface 111 are opposite and in contact. The board surface and the wiring surface of the flat plate structure can be in contact with each other. For example, when the board surface of the flat plate structure is a circular surface and the wiring surface is also a circular surface, the two circular surfaces overlap and contact each other, and the centers of the circles are aligned when they overlap.

[0058] Optionally, in some embodiments of this application, a Negative Temperature Coefficient (NTC thermistor) is also electrically connected to the flexible circuit board 41 for monitoring the temperature of the battery cell.

[0059] In related technologies, in order to connect multiple battery cells 100 in a battery pack in series, a wire connecting plate is generally used to connect the positive terminal terminal 111 of the battery cell 100 to the terminal terminal 111 of the negative terminal terminal 11 of the adjacent battery cell 100. Specifically, the wire connecting plate is simultaneously brought into contact with the positive terminal terminal 111 of the battery cell 100 and the terminal terminal 111 of the negative terminal terminal 11 of the adjacent battery cell 100 to form a conductive channel.

[0060] When the wiring surface 111 is planar, a flat plate structure is provided for the flexible circuit board 41, and the plate surface 4121 of the flat plate structure is positioned opposite and in contact with the wiring surface 111. The flat plate structure is used to detect the voltage of the terminal. This allows for a larger effective conductive area at the contact surface between the terminal 11 and the flexible circuit board 41, thereby reducing the resistance of the conductive path and facilitating current conduction. It also reduces the heat generated during battery pack operation, thus making the battery pack more stable in operation and further improving its safety.

[0061] Furthermore, since the wiring surface 111 of the conductive connecting plate used to connect the terminal post 11 is flat, and the flexible circuit board 41 is provided with a flat plate structure, the structure after the conductive connecting plate and the terminal post 111 are connected is more stable. At the same time, it can also increase the effective conductive area at the contact surface between the conductive connecting plate and the flexible circuit board 41, thereby reducing the resistance of the conductive channel and facilitating current conduction. This further reduces the heat generated during battery pack operation, thus making the battery pack more stable in operation and further improving the safety of the battery pack.

[0062] In this embodiment, the flat plate structure 412 is directly opposite to and in contact with the wiring surface 111 of the terminal post 11. The cell body 1 has two terminals 11 at the positive and negative positions, respectively; therefore, there are two flat plate structures 412. Each of the two flat plate structures 412 is opposite to and in contact with the wiring surface 111 of the two terminal posts 11. The ribbon cable 411 connects the two flat plate structures 412, which makes the structure of the flexible circuit board 41 more stable, thus making the cell 100 more stable during operation and further improving the safety of the battery pack.

[0063] Alternatively, in some embodiments, see Figure 1 , Figure 2 and Figure 3 The wiring surface 111 is a circular plane, and the flat plate structure 412 is a circular flat plate. The circular plane and the circular flat plate have the same diameter, and the surface of the circular flat plate is opposite to and in contact with the circular plane.

[0064] Compared to other shapes, when the terminal surface 111 is set as a circular plane and the flat plate structure 412 is set as a circular flat plate, the two are easier to align and connect, thus simplifying the assembly of the battery cell 100. Furthermore, when a circular flat plate is subjected to pressure deformation, the deformation is more uniform in all radial directions. At the same time, the aforementioned electrode post 11 is cylindrical; the manufacturing technology for cylindrical electrode posts 11 is relatively mature and cost-effective, thus reducing the production cost of the battery cell 100.

[0065] It should be noted that the aforementioned pole post 11 can be cylindrical, square, or other shapes, and this application embodiment does not limit this. When the pole post 11 is cylindrical, the aforementioned flat plate structure 412 is a circular flat plate structure. When the pole post 11 is square, the aforementioned flat plate structure 412 is a square flat plate structure.

[0066] Alternatively, in some embodiments, see Figure 1 , Figure 2 and Figure 3 Figure 6 , Figure 8 and Figure 9The battery cell 100 includes an insulating ring 5, which is disposed on the outer side of the flat plate structure 412 radially. The projection of the flat plate structure 412 along its axial direction (Y-axis) lies within the projection of the insulating ring 5. The surface of the insulating ring 5 that contacts the battery cell body 1 is an insulating contact surface, and the surface of the flat plate structure 412 that contacts the battery cell body 1 is a conductive contact surface. The insulating contact surface protrudes a first distance H1 away from the conductive contact surface of the battery cell body. A boss 12 is provided on the surface of the battery cell body 1, and a terminal post 11 is installed in the boss 12. The plane of the wiring surface 111 protrudes a second distance H2 relative to the boss 12 towards the flat plate structure 412. The absolute value of the difference between the first distance H1 and the second distance H2 is less than 0.5 mm.

[0067] It should be noted that the aforementioned pole post 11 is installed in the boss 12, and the height difference between the pole post 11 and the boss 12 can be 0.5 to 1.0 mm.

[0068] In the embodiments of this application, such as Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, an insulating ring 5 is provided on the outer radial side of the flat plate structure 412; along the axial direction of the flat plate structure 412, the projection of the flat plate structure 412 is located within the projection of the insulating ring 5. In this way, the insulating ring 5 can protect the edge of the flat plate structure 412, reduce the probability of the edge of the flat plate structure 412 being damaged by external forces, and thus extend the service life of the battery cell 100.

[0069] Next, since the surface of the insulating ring 5 that contacts the cell body 1 is an insulating contact surface, and the surface of the flat plate structure 412 that contacts the cell body 1 is a conductive contact surface, the insulating contact surface protrudes a first distance H1 away from the cell body relative to the conductive contact surface. A boss 12 is provided on the surface of the cell body 1, and the terminal post 11 is installed in the boss 12. The wiring surface 111 protrudes a second distance H2 relative to the boss 12 towards the flat plate structure 412; the absolute value of the difference between the first distance H1 and the second distance H2 is less than 0.5 mm. Thus, the insulating ring 5 and the flat plate structure 412 enclose a groove, and the terminal post 11 protrudes from the boss 12 to form a protrusion. The absolute value of the difference between the depth of the groove and the height of the boss 12 is less than 0.5 mm, allowing the groove and the protrusion to fit together. When the flat plate structure 412 and the wiring surface 111 abut, the insulating ring 5 also abuts against the surface of the boss 12. When the flat plate structure 412 and the terminal block 11's wiring surface 111 are positioned opposite and in contact, the grooves and protrusions serve a positioning function, allowing the flat plate structure 412 to align with the terminal block 11's wiring surface 111. This also provides a larger support surface for the conductive connection plate, making the battery pack structure more stable.

[0070] The second distance by which the wiring surface 111 protrudes relative to the boss 12 toward the flat plate structure 412 can be 0.5mm to 1.0mm.

[0071] Alternatively, in some embodiments, see Figure 1 , Figure 2 Figure 3 Figure 4 , Figure 11 The data receiving device 4 includes a receiving module 43, a flexible circuit board 41, and a strain detection element 3, all of which are electrically connected to the receiving module 43. A pressure detection element 2 is disposed on the surface of the receiving module 43 near the battery cell body 1. The receiving module 43, the cable section 411, and the wiring surface 111 of the terminal post 11 are disposed on the same side of the battery cell body 1. The battery cell 100 also includes an insulating top cover 6, which covers the cable section 411 and exposes the receiving module 43 and the wiring surface 111.

[0072] In this embodiment, since both the cable section 411 and the strain detection element 3 are electrically connected to the receiving module 43, the pressure detection element 2 is disposed on the surface of the receiving module 43 near the cell body 1. The voltage, strain, and pressure information data detected by the flat plate structure 412 between the two terminals 11 can be transmitted to the receiving module 43, and the pressure detection device is protected by the receiving module 43. Furthermore, since the receiving module 43, the cable section 411, and the wiring surface 111 are disposed on the same side of the cell body 1, this facilitates the uniform arrangement and protection of all components of the cell 100. The insulating top cover 6 covers the cable section 411 and exposes the receiving module 43 and the wiring surface 111. This insulating top cover 6 protects the receiving module 43, the cable section 411, and the wiring surface 111 from damage caused by external forces, thereby extending the service life of the cell 100 and the battery pack.

[0073] It should be noted that the aforementioned receiving module 43 can be a CSU (Channel Service Unit) module, such as... Figure 12As shown, the voltage of the positive and negative terminals of the battery cell is acquired via a flexible circuit board 41 cable, which powers the CSU module to ensure its normal operation. The CSU acquisition module includes a power chip, an acquisition chip, a microcontroller unit, a pressure sensor, and an analog front-end (AEF). The AEF processes the analog signals and feeds them back to the microcontroller unit. The acquisition chip communicates bidirectionally with the strain sensor to collect stress changes in the battery cell and feed them back to the microcontroller unit in the CSU acquisition module. An NTC thermistor is directly connected to the microcontroller unit to reflect temperature changes in the battery cell, and the pressure sensor is directly connected to the microcontroller unit to monitor pressure changes in the battery cell. Based on this, the CSU module can receive relevant information data acquired by the data receiving device 4. The CSU is responsible for acquiring the individual battery cell voltage, temperature, pressure, current, impedance, and strain, as well as the cell balancing control. The CSU module has several modes, such as... Figure 13 As shown:

[0074] The system reads data from the Flash memory during hardware initialization and enters slave board scan mode. The slave board scans the motherboard network signals. This slave board scan mode is a brief relay state; if communication times out, it enters slave board communication mode. The slave board periodically synchronizes its clock with the motherboard. Upon successful communication with the motherboard, it enters slave board operating mode, where all sensors operate normally, and the slave board receives master control information and reports data sequentially. If pairing with the motherboard is successful directly in scan mode, it directly enters slave board operating mode. If pairing fails, it returns to scan mode. If the slave board operating mode receives a sleep command from the motherboard, it enters slave board sleep mode, periodically synchronizing its clock with the motherboard, and the sensors periodically collect data to detect thermal runaway faults. If the slave board sleep mode receives a wake-up command from the motherboard, it switches back to slave board operating mode. If communication between the slave board sleep mode and the motherboard is lost, it will also enter slave board scan mode.

[0075] Alternatively, in some embodiments, see Figure 1 , Figure 2 and Figure 3 The data receiving device 4 also includes a strain information transmission line 44, which is attached to the surface of the battery cell body 1; the first end of the strain information transmission line 44 is electrically connected to the receiving module 43, and the second end of the strain information transmission line 44 is electrically connected to the strain detection element 3.

[0076] In this embodiment, the strain information transmission line 44 is used to transmit the strain information data detected and generated by the strain detection element 3 to the receiving module 43. Since the strain information transmission line 44 is attached to the surface of the cell body 1, the space occupied by the strain information transmission line 44 can be reduced, the volume of the cell 100 can be reduced, and the volume of the battery pack can be reduced, thus improving the energy density of the battery pack.

[0077] Alternatively, in some embodiments, see Figure 1 , Figure 2 and Figure 3 The strain gauge is attached to the center of the first surface of the battery cell body 1 to detect changes in stress in the battery cell body 1.

[0078] Generally, the surface with the largest area of ​​the battery cell body 1 is the first surface, and the deformation at the center of the first surface is the most obvious. When a strain gauge is attached to this surface, the strain information detected by the strain gauge is more obvious. This makes it easier for the receiving module 43 to detect the deformation of the battery cell 100 shell, thus improving the sensitivity of the battery cell 100 in detecting deformation. Of course, the first surface can also be any surface other than the surface on which the receiving module 43 is installed; this embodiment of the application does not limit it.

[0079] Alternatively, in some embodiments, see Figure 1 , Figure 2 , Figure 3 and Figure 10 The cell body 1 is provided with an injection hole 13, which is used to inject electrolyte into the cell body 1 from the outside; a sealing member 14 is provided at the opening of the injection hole 13, and the sealing member 14 is detachably connected to the opening of the injection hole 13; the receiving module 43 covers the outside of the sealing member 14.

[0080] It should be noted that the aforementioned sealing component 14 can be a sealing ring with holes for detecting the gas inside the battery cell body 1. The sealing ring ensures both sealing and the detection of fixation strength and gas pressure.

[0081] The aforementioned injection hole 13 and sealing element 14 meet the basic requirement of injecting electrolyte into the cell 100 from the outside. Furthermore, since the receiving module 43 covers the outside of the sealing element 14, it effectively shields the sealing element 14, making the cell 100 more aesthetically pleasing. In addition, the receiving module 43 also exerts a squeezing effect on the sealing element 14. This further ensures that the sealing element 14 more stably seals the opening of the injection hole 13, thus making the structure of the cell 100 more stable.

[0082] Alternatively, in some embodiments, see Figure 1 , Figure 2 and Figure 3 An adhesive layer is provided between the receiving module 43 and the surface of the battery cell body 100, which is used to connect the receiving module 43 to the surface of the battery cell 100. This makes the receiving module 43 and the surface of the battery cell 100 bond more firmly.

[0083] To prevent liquid glue from overflowing from the edge of the receiving module 43 during glue application, an annular overflow groove is provided around the injection hole 13. This overflow groove is used to contain the liquid glue that overflows during glue application, thus making the receiving module 43 more flat and aesthetically pleasing after bonding.

[0084] Alternatively, in some embodiments, see Figure 1 , Figure 2 and Figure 3 The sealing component 14 is provided with a receiving groove 141 at one end away from the battery cell body 1. The bottom surface of the receiving groove 141 is provided with an air hole 1411, which connects the receiving groove 141 and the interior of the battery cell body 1. When the receiving module 43 is connected to the battery cell body 1, the air pressure detection component 2 is housed in the receiving groove 141.

[0085] In this way, the pressure detection element 2 can sense the pressure changes inside the cell body 1 through the air vent 1411, thereby generating relatively accurate pressure information data. Furthermore, since the pressure detection element 2 is housed in the receiving groove 141, its space occupation can be reduced while maintaining its basic functions, thus reducing the volume of the cell 100 and consequently the volume of the battery pack, thereby further improving the energy density of the battery pack.

[0086] This application also discloses a battery pack, which includes any of the above-mentioned battery cells 100.

[0087] Since the battery cell 100 includes a pressure detection element 2, which is used to detect the air pressure inside the battery cell body 1, the pressure detection element 2 is connected to the battery cell body 1 and to a data receiving device 4 to receive air pressure information data. In this way, changes in air pressure inside the battery cell body 1 can be detected by the pressure detection element 2, generating air pressure information data, which the data receiving device 4 can receive.

[0088] Next, since the battery cell 100 includes a strain detection element 3, which is connected to the battery cell body 1 and is also connected to the data receiving device 4, it is used to receive strain information data. In this way, the stress change of the outer shell of the battery cell body 1 can be detected by the strain detection element 3 and strain information data can be generated, which can be received by the data receiving device 4.

[0089] The aforementioned data receiving device 4 is connected to a controller. This controller can acquire the aforementioned air pressure information from the data receiving device 4 and compare it with standard air pressure data. When the air pressure information exceeds the standard air pressure data, an air pressure warning will be issued. Similarly, the controller can acquire the aforementioned strain information from the data receiving device 4 and compare it with standard strain data. When the strain information exceeds the standard strain data, a deformation warning will be issued. Thus, when using the battery cell 100, occupants can monitor the changes in air pressure inside the battery cell body 1 and the deformation of the battery cell 100 in real time. They can then quickly take appropriate measures based on the actual situation, thereby avoiding safety hazards caused by changes in internal air pressure and deformation of the battery cell 100's outer casing during discharge. Therefore, the safety of the battery pack can be improved.

[0090] This application also discloses an electrical device that includes the aforementioned battery pack.

[0091] Because of the high safety of the aforementioned battery pack, electrical devices equipped with it are also highly safe. Furthermore, the high energy density of the battery pack allows for a reduction in its size while maintaining a certain capacity, thus facilitating the miniaturization of electrical devices.

[0092] It should be noted that the electrical equipment can be a drone, robot, or electric vehicle, or other electrical equipment; this application embodiment does not limit this.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery cell (100), characterized in that, include: Battery cell body (1), A pressure detection device (2) is connected to the outer surface of the battery cell body (1) and is used to detect the pressure inside the battery cell body (1). Strain detection element (3), the strain detection element (3) is connected to the outer surface of the battery cell body (1); The data receiving device (4) is connected to the outer surface of the battery cell body (1). The air pressure detection device (2) and the strain detection device (3) are both electrically connected to the data receiving device (4) and are used to receive air pressure information data and strain information data.

2. The battery cell (100) according to claim 1, characterized in that, The battery cell body (1) is provided with a terminal post (11), and the side of the terminal post (11) away from the battery cell body (1) has a wiring surface (111); The data receiving device (4) includes a flexible circuit board (41), which includes a ribbon cable section (411) and a flat plate structure (412); the ribbon cable section (411) and the flat plate structure (412) are electrically connected; the flat plate structure (412) has a plate surface (4121). The plate surface (4121) is opposite to and in contact with the wiring surface (111), and the plate structure is used to detect the voltage of the pole.

3. The battery cell (100) according to claim 2, characterized in that, The wiring surface (111) is a circular plane, and the flat plate structure (412) is a circular flat plate. The circular plane and the circular flat plate have the same diameter, and the surface of the circular flat plate is opposite to and in contact with the circular plane.

4. The battery cell (100) according to claim 3, characterized in that, The battery cell (100) includes an insulating ring (5) disposed on the outer side of the flat plate structure (412) in the radial direction; the projection of the flat plate structure (412) is located within the projection of the insulating ring (5) along the axial direction of the flat plate structure (412).

5. The battery cell (100) according to claim 4, characterized in that, The surface of the insulating ring (5) that contacts the cell body (1) is an insulating contact surface, and the surface of the flat plate structure (412) that contacts the cell body (1) is a conductive contact surface. The insulating contact surface protrudes a first distance away from the cell body (1) relative to the conductive contact surface. The surface of the battery cell body (1) is provided with a boss (12), the terminal post (11) is installed in the boss (12), and the wiring surface (111) protrudes a second distance relative to the boss (12) toward the flat plate structure (412); the absolute value of the difference between the first distance and the second distance is less than 0.5mm.

6. The battery cell (100) according to claim 5, characterized in that, The data receiving device (4) includes a receiving module (43); the flexible circuit board (41) and the strain detection element (3) are both electrically connected to the receiving module (43); the air pressure detection element (2) is disposed on the surface of the receiving module (43) near the battery cell body (1); the receiving module (43), the cable section (411) and the wiring surface (111) are disposed on the same side of the battery cell body (1); The battery cell (100) also includes an insulating top cover (6), which covers the wiring section (411) and exposes the receiving module (43) and the wiring surface (111).

7. The battery cell (100) according to claim 6, characterized in that, The data receiving device (4) further includes a strain information transmission line (44), which is attached to the surface of the battery cell body (1); the first end of the strain information transmission line (44) is electrically connected to the receiving module (43), and the second end of the strain information transmission line (44) is electrically connected to the strain detection element (3).

8. The battery cell (100) according to claim 7, characterized in that, The strain detection element (3) is a strain gauge. ， The strain gauge is attached to the center of the first surface of the battery cell body (1) and is used to detect changes in stress in the battery cell body (1).

9. The battery cell (100) according to claim 6, characterized in that, The battery cell body (1) is provided with a liquid injection hole (13), and a sealing member (14) is provided at the opening of the liquid injection hole (13). The sealing member (14) is detachably connected to the opening of the liquid injection hole (13). The receiving module (43) covers the outside of the sealing member (14).

10. The battery cell (100) according to claim 9, characterized in that, An adhesive layer is provided between the receiving module (43) and the surface of the battery cell body (1), and the adhesive layer is used to connect the receiving module (43) and the surface of the battery cell (100).

11. The battery cell (100) according to claim 9, characterized in that, The sealing member (14) has a receiving groove (141) at one end away from the battery cell body (1). The bottom surface of the receiving groove (141) has an air hole (1411) that connects the receiving groove (141) and the interior of the battery cell body (1). When the receiving module (43) is connected to the battery cell body (1), the air pressure detection member (2) is housed in the receiving groove (141).

12. A battery pack, characterized in that, Includes the battery cell (100) as described in any one of claims 1-11.

13. An electrical appliance, characterized in that, Includes the battery pack as described in claim 12.

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