Battery cell, battery device, and electric device

Abstract

The application discloses a battery monomer, a battery device and an electric equipment, and relates to the technical field of batteries. The battery monomer comprises an end cover assembly, the end cover assembly comprises a cover plate body and a pressure relief valve, the cover plate body is provided with a pressure relief port, the pressure relief valve blocks the pressure relief port, the pressure relief valve is provided with a notch, the notch on the pressure relief valve is defined as a first notch, the pressure relief valve has a center point and a plurality of center lines which form an included angle with the direction of the pressure relief port, the plurality of center lines extend in different directions and intersect at the center point, each center line has two opposite directions with the center point as the origin, and all the first notches are arranged on the same direction of at least one of the center lines and close to the circumference of the pressure relief valve. The technical scheme of the application reduces the risk that the substances sprayed from the inside of the battery monomer are reflected by other components and block the pressure relief port.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell, battery device, and electrical equipment. Background Technology

[0002] When a short circuit or puncture occurs within a battery cell, the internal pressure rises, necessitating timely pressure relief. A pressure relief port is typically located on the end cap assembly of the battery cell, and a pressure relief valve is installed at this port. As the weakest point on the battery cell, the pressure relief valve opens to release pressure when the internal pressure exceeds its opening pressure. However, with traditional pressure relief valves, the port is easily blocked by ejected material, potentially leading to pressure relief failure. Utility Model Content

[0003] The main purpose of this application is to provide a battery cell, battery device, and electrical equipment, which aims to improve the problem of pressure leakage failure that easily occurs at the end cap assembly of the battery cell.

[0004] To achieve the above objectives, the battery cell proposed in this application includes an end cap assembly, which includes a cover plate body and a pressure relief valve. The cover plate body has a pressure relief port; the pressure relief valve blocks the pressure relief port; the pressure relief valve has a groove, which is defined as a first groove. The pressure relief valve has a center point and multiple center lines that form an angle with the orientation of the pressure relief port. The multiple center lines extend in different directions and intersect at the center point. Each center line has two opposing orientations with the center point as its origin. All the first grooves are concentrated in the same orientation of at least one of the center lines and are located near the periphery of the pressure relief valve.

[0005] In this application's technical solution, the battery cell includes an end cap assembly. By setting a pressure relief port on the cover plate body, and sealing the pressure relief port with a pressure relief valve, and having a groove on the pressure relief valve, which is defined as the first groove, the pressure relief valve provides a good sealing effect when the internal pressure value of the battery cell is normal. However, when a short circuit or excessive temperature occurs inside the battery cell, the internal pressure increases to the point that it can break open the first groove on the pressure relief valve, thereby forming an opening at the first groove to allow pressure relief inside the battery cell.

[0006] In addition, the pressure relief valve has a center point and multiple center lines passing through the center point. The extension direction of the center lines is set at an angle to the orientation of the pressure relief port. All the first notches are concentrated in the same orientation of at least one of the center lines and are set close to the periphery of the pressure relief valve. This makes all the first notches close to the end side of the pressure relief valve, thereby guiding the material to be ejected to concentrate on the end side of the pressure relief valve and eject it from the end side of the pressure relief valve. This achieves the effect of guiding the ejected material to be ejected to both sides of the battery cell, reducing the risk that the material to be ejected will be directly sprayed onto the component corresponding to the end cap assembly of the battery cell, thereby reducing the risk that the ejected material will be reflected by other components and block the pressure relief port.

[0007] In one embodiment of this application, the first notch is arc-shaped, and the center of the first notch is located on the side of the first notch facing the center point.

[0008] This design further guides the material to be ejected from the battery cell to be ejected at an angle away from the center point, further reducing the risk of the ejected material being reflected back by the component directly opposite the cover plate.

[0009] In one embodiment of this application, the pressure relief valve is elongated and has a first end and a second end disposed opposite to each other in its length direction, and the first groove is provided on the first end or the second end.

[0010] With this configuration, when the first notch is broken, the pressure relief valve near the first notch is more likely to bend and deform towards the second end, thereby further improving the stability of pressure relief.

[0011] In one embodiment of this application, the cover plate body is further provided with a liquid injection hole, which is spaced apart from the pressure relief port; the end cap assembly further includes a sealing plug, which seals the liquid injection hole.

[0012] With this design, after the electrolyte is injected into the battery cell through the injection hole, the inside of the battery cell can be sealed and protected by a sealing plug, reducing the risk of dust or moisture entering the battery cell through the injection hole and affecting the battery cell's performance.

[0013] In one embodiment of this application, the sealing plug is located on the side of the pressure relief valve away from the first notch.

[0014] This design reduces the risk of material inside the battery cell being ejected onto the sealing plug during the depressurization process, thereby reducing the need to replace the sealing plug.

[0015] In one embodiment of this application, the sealing plug is provided with a second groove.

[0016] With this configuration, when the aforementioned pressure relief valve fails, the sealing plug can serve as a backup pressure relief structure, thereby breaking through the second notch when the internal air pressure of the battery cell is too high, thus achieving the effect of relieving internal pressure of the battery cell.

[0017] In addition, by setting a second notch on the sealing plug, it can also serve as a pressure relief structure, thereby reducing the volume of the pressure relief valve and thus reducing the size of the pressure relief port on the cover plate body, thereby improving the strength of the cover plate body.

[0018] In one embodiment of this application, the sealing plug has at least two central surfaces with openings parallel to the injection holes, and the second groove is concentrated on one side of at least one of the central surfaces.

[0019] This design concentrates the second notch on one end of the sealing plug, which facilitates the guidance of the material ejected from inside the battery cell toward the end cap assembly, thereby reducing the risk of the injection hole being blocked by reflection from components facing the end cap assembly.

[0020] In one embodiment of this application, the depth of the second notch is less than the depth of the first notch.

[0021] With this configuration, when the pressure relief valve fails and the internal air pressure of the battery becomes too high, the pressure relief effect is achieved by puncturing the second notch. This ensures that the sealing plug on the end cap assembly serves as a backup pressure relief structure, reducing the risk of individual battery cell pressure relief failure.

[0022] In one embodiment of this application, the second notch is located on the side of the sealing plug away from the pressure relief valve.

[0023] This configuration places the second notch on the sealing plug at the position furthest from the pressure relief valve, thereby reducing the risk of material ejected from the first notch of the pressure relief valve spraying towards the second notch, and thus ensuring the stability of the sealing plug as a backup pressure relief structure.

[0024] In one embodiment of this application, the second notch is arc-shaped, and the center of the second notch is located on the side of the second notch facing the center of the sealing plug.

[0025] This design facilitates deformation of the portion of the sealing plug located near the center of the second notch, creating an opening away from the center of the sealing plug. This further guides the material to be ejected from inside the battery to be ejected at an angle away from the center of the sealing plug, reducing the risk of the ejected material being reflected back by components directly opposite the cover plate. Additionally, this design also reduces the risk of material ejected from inside the battery cell clogging the pressure relief port.

[0026] This application also proposes a battery device comprising the aforementioned battery cell.

[0027] The battery device in this application includes the aforementioned battery cell. In the end cap assembly of the battery cell, the end cap assembly includes a cover plate body and a pressure relief valve. By providing a pressure relief port on the cover plate body and sealing the pressure relief port with the pressure relief valve, and having a groove on the pressure relief valve, which is defined as the first groove, the pressure relief valve provides a good sealing effect when the internal pressure value of the battery cell is normal. However, when a short circuit or excessive temperature occurs inside the battery cell, the internal pressure increases to the point that it can break open the first groove on the pressure relief valve, thereby forming an opening at the first groove to allow pressure relief inside the battery cell.

[0028] In addition, the pressure relief valve has a center point and multiple center lines passing through the center point. The extension direction of the center lines is set at an angle to the orientation of the pressure relief port. All the first notches are concentrated in the same orientation of at least one of the center lines and are set close to the periphery of the pressure relief valve. This makes all the first notches close to the end side of the pressure relief valve, thereby guiding the material to be ejected to concentrate on the end side of the pressure relief valve and eject it from the end side of the pressure relief valve. This achieves the effect of guiding the ejected material to be ejected to both sides of the battery cell, reducing the risk that the material to be ejected will be directly sprayed onto the component corresponding to the end cap assembly of the battery cell, thereby reducing the risk that the ejected material will be reflected by other components and block the pressure relief port.

[0029] This application also proposes an electrical device including the aforementioned battery device.

[0030] The electrical equipment in this application includes the aforementioned battery device. The battery cell in the battery device includes an end cap assembly. The end cap assembly of the battery cell includes a cover plate body and a pressure relief valve. By providing a pressure relief port on the cover plate body and sealing the pressure relief port with the pressure relief valve, and having a groove on the pressure relief valve, which is defined as the first groove, the pressure relief valve provides a good sealing effect when the internal pressure value of the battery cell is normal. However, when a short circuit or excessive temperature occurs inside the battery cell, the internal pressure increases to the point that it can break open the first groove on the pressure relief valve, thereby forming an opening at the first groove to allow pressure relief inside the battery cell.

[0031] In addition, the pressure relief valve has a center point and multiple center lines passing through the center point. The extension direction of the center lines is set at an angle to the orientation of the pressure relief port. All the first notches are concentrated in the same orientation of at least one of the center lines and are set close to the periphery of the pressure relief valve. This makes all the first notches close to the end side of the pressure relief valve, thereby guiding the material to be ejected to concentrate on the end side of the pressure relief valve and eject it from the end side of the pressure relief valve. This achieves the effect of guiding the ejected material to be ejected to both sides of the battery cell, reducing the risk that the material to be ejected will be directly sprayed onto the component corresponding to the end cap assembly of the battery cell, thereby reducing the risk that the ejected material will be reflected by other components and block the pressure relief port. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0034] Figure 2 This is an exploded view of the battery device according to some embodiments of this application;

[0035] Figure 3 This is an exploded structural diagram of a battery cell according to some embodiments of this application;

[0036] Figure 4 This is a top view of one embodiment of the end cap assembly of this application;

[0037] Figure 5 This is a top view of another embodiment of the end cap assembly of this application;

[0038] Figure 6 This is a three-dimensional structural diagram of the sealing plug in another embodiment of the end cap assembly of this application.

[0039] Explanation of icon numbers:

[0040] 1000, vehicles;

[0041] 100. Battery assembly; 200. Controller; 300. Motor;

[0042] 10. Box body; 11. First part; 12. Second part;

[0043] 20. Battery cell; 21. End cap assembly; 211. Cover plate body; 211a. Pressure relief port; 211b. Liquid filling hole; 212. Pressure relief valve; 212a. First notch; 213. Sealing plug; 213a. Second notch; 21a. Electrode terminal; 22. Housing; 23. Cell assembly; 23a. Tab;

[0044] a1. Centerline;

[0045] o, center point;

[0046] x, length direction;

[0047] A. Center plane.

[0048] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0049] The technical solutions of 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 of this application, and not all of the embodiments. Based on the embodiments of 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.

[0050] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0051] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are 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 with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0052] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0053] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0054] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0055] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0056] Please refer to Figure 2 , Figure 2This is an exploded view of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10. The housing 10 provides a space for accommodating the battery cell 20, and the housing 10 can adopt various structures. In some embodiments, the housing 10 may include a first portion 11 and a second portion 12, which overlap each other, jointly defining a space for accommodating the battery cell 20. The second portion 12 may be a hollow structure with one open end, and the first portion 11 may be a plate-like structure, covering the open side of the second portion 12 so that the first portion 11 and the second portion 12 jointly define the space; alternatively, the first portion 11 and the second portion 12 may both be hollow structures with one open side, with the open side of the first portion 11 covering the open side of the second portion 12. Of course, the housing 10 formed by the first portion 11 and the second portion 12 can be of various shapes, such as a cylinder, a cuboid, etc.

[0057] In the battery device 100, there can be multiple battery cells 20. These multiple battery cells 20 can be connected in series, parallel, or in a hybrid configuration via electrical connection components. A hybrid configuration means that multiple battery cells 20 are connected in both series and parallel connections. Multiple battery cells 20 can be directly connected in series, parallel, or in a hybrid configuration, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, parallel, or in a hybrid configuration to form a battery cell group, and then these battery cell groups are connected in series, parallel, or in a hybrid configuration via electrical connection components to form a whole, which is also housed within the housing 10. The battery device 100 may also include other structures; for example, it may include a busbar component for realizing electrical connections between the multiple battery cells 20.

[0058] Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 20 can be cylindrical, flat, cuboid, or other shapes.

[0059] Please refer to Figure 3 , Figure 3 This is an exploded structural diagram of a battery cell 20 provided in some embodiments of this application. The battery cell 20 refers to the smallest unit constituting the battery device 100. For example... Figure 3 The battery cell 20 includes an end cap assembly 21, a housing 22, a cell assembly 23, and other functional components.

[0060] End cap assembly 21 refers to a component that covers the opening of housing 22 to isolate the internal environment of battery cell 20 from the external environment. The shape of end cap assembly 21 can be adapted to the shape of housing 22 to fit it. Optionally, end cap assembly 21 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap assembly 21 is not easily deformed under pressure or impact, allowing battery cell 20 to have higher structural strength. Functional components such as electrode terminals 21a can be provided on end cap assembly 21. Electrode terminals 21a can be used for electrical connection with cell assembly 23 to output or input electrical energy to battery cell 20. The material of end cap assembly 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose special limitations on this. In some embodiments, an insulating member can also be provided inside end cap assembly 21. The insulating member can be used to isolate the electrical connection components inside housing 22 from end cap assembly 21 to reduce the risk of short circuit. For example, the insulating element can be made of plastic, rubber, etc.

[0061] The housing 22 is a component used to cooperate with the end cap assembly 21 to form the internal environment of the battery cell 20. This internal environment can accommodate the cell assembly 23, electrolyte, and other components. The housing 22 and the end cap assembly 21 can be independent components. An opening can be provided on the housing 22, and the end cap assembly 21 can close the opening to form the internal environment of the battery cell 20. Alternatively, the end cap assembly 21 and the housing 22 can be integrated. Specifically, the end cap assembly 21 and the housing 22 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 22, the end cap assembly 21 closes the housing 22. The housing 22 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 22 can be determined according to the specific shape and size of the cell assembly 23. The material of the housing 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special limitations on this.

[0062] The cell assembly 23 is the component in the battery cell 20 where the electrochemical reaction occurs. The casing 22 may contain one or more cell assemblies 23. The cell assembly 23 is mainly formed by winding or stacking positive and negative electrode plates, and typically a separator is provided between the positive and negative electrode plates. The portions of the positive and negative electrode plates containing active material constitute the main body of the cell assembly 23, while the portions of the positive and negative electrode plates without active material each constitute a tab 23a. The positive and negative tabs may be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery device 100, the positive and negative active materials react with the electrolyte, and the tabs 23a connect to the electrode terminals 21a to form a current loop.

[0063] Please refer to the reference. Figures 2 to 4 In some embodiments, the end cap assembly 21 may also be provided with a pressure relief port 211a, and a pressure relief valve 212 is installed at the pressure relief port 211a to release the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. However, when the conventional pressure relief valve 212 is opened, the material inside the battery cell 20 is usually ejected directly upwards. After being ejected, this material is easily blocked by the reflection effect of other components adjacent to the battery cell 20, which can easily lead to pressure relief failure.

[0064] To address the issue of pressure relief failure at the end cap assembly 21 of the battery cell 20, this application proposes a battery cell 20 including an end cap assembly 21. The end cap assembly 21 includes a cover plate body 211 and a pressure relief valve 212. The cover plate body 211 has a pressure relief port 211a. The pressure relief valve 212 blocks the pressure relief port 211a. The pressure relief valve 212 has a groove, which is defined as a first groove 212a. The pressure relief valve 212 has a center point o and multiple center lines a1 that form an angle with the orientation of the pressure relief port 211a. The multiple center lines a1 extend in different directions and intersect at the center point o. Each center line a1 has two opposing orientations with the center point o as the origin. All first grooves 212a are concentrated on the same orientation of at least one of the center lines a1 and are located near the periphery of the pressure relief valve 212.

[0065] The cover body 211 can be rectangular, circular, or other shapes, which can be adapted to the opening shape of the casing 22 in the battery cell 20. The pressure relief port 211a on the cover body 211 can be circular, rectangular, or other shapes.

[0066] The pressure relief valve 212 can be a valve plate or valve block structure. This valve plate or valve block can be integrally connected to the cover plate body 211, or it can be connected by welding or bonding, or by other detachable connection methods, such as snap-fit ​​or screw connection. Alternatively, the pressure relief valve 212 includes a mounting base installed at the pressure relief port 211a. The mounting base has a valve port, and a valve stem is slidably mounted at the valve port. The valve stem has a sealing part for sealing the valve port. When the air pressure inside the battery cell 20 is high, it can push open the valve stem structure, causing the sealing part to open the valve port. In this application, for simplicity, the pressure relief valve 212 can adopt a valve plate structure with grooves. The strength at these grooves is relatively weak, so when the internal pressure of the battery cell 20 is high, the grooves can be broken first, causing the valve plate to deform and form an opening communicating with the pressure relief port 211a. This allows gas inside the battery to be guided to the opening and then ejected, achieving the effect of relieving pressure inside the battery cell 20. Specifically, the groove is defined as a first groove 212a, which can be a continuous line segment or a combination of multiple spaced line segments. The first groove 212a can be straight, arc-shaped, or V-shaped. It is understood that for the gas pressure inside the battery cell 20 to break through the first groove 212a, the first groove 212a refers to a groove formed by recesses along the direction of the pressure relief port 211a.

[0067] The orientation of the pressure relief port 211a refers to the direction in which the pressure relief port 211a faces the pressure relief valve 212, that is, the orientation of the pressure relief port 211a is the thickness direction of the cover plate body 211. The pressure relief valve 212 has multiple center lines a1 that form an angle with the orientation of the pressure relief port 211a. For example, this center line a1 can be understood as the line passing through the center point o and parallel to the largest surface of the valve plate when the pressure relief valve 212 is a valve plate structure. The pressure relief valve 212 can be a regular shape, such as rectangular, circular, elliptical, or oblong; or the pressure relief valve 212 can be an irregular shape. It can be understood that regardless of whether the pressure relief valve 212 is a regular or irregular shape, it has a center point o. When the pressure relief valve 212 is a regular circle, its center point o is the center of the circle; when the pressure relief valve 212 is a regular rectangle, its center point o is the intersection of the two diagonals of the rectangle; when the pressure relief valve 212 is an irregular shape, its center point o is its geometric center. The method for determining this is well-known to those skilled in the art and will not be described in detail here. It is understood that any line that can pass through the center point o can be used as the center line a1.

[0068] For example, when the pressure relief valve 212 has a rectangular valve plate structure, the center line a1 can be a line extending along the length direction x of the rectangular valve plate and passing through the center point o, or the center line a1 can be a line extending along the width direction of the rectangular valve plate and passing through the center point o. The length direction x is defined as the left-right direction, and the width direction as the front-back direction; all the first notches 212a are concentrated in the same direction as at least one of the center lines a1, which can mean that all the first notches 212a are concentrated on the front or back side of the center line a1 extending along the length direction x; or it can mean that all the first notches 212a are concentrated on the left or right side of the center line a1 extending along the width direction.

[0069] When the pressure relief valve 212 has a circular valve plate structure, the center line a1 can be any diameter of the circular valve plate. All the first marks 212a need to be concentrated in the same direction along any diameter with the center point o as the origin. For example, if one of the diameters extends in the front-to-back direction, all the first marks 212a can be concentrated on the left or right side of that diameter. When one of the diameters extends in the left-to-right direction, all the first marks 212a can be concentrated on the front or back side of that diameter. It should be noted that the first marks 212a only need to be concentrated in the same direction along at least one center line a1, but do not need to be concentrated in the same direction along every center line a1.

[0070] All the first notches 212a are concentrated in the same direction on at least one of the center lines a1 and are located near the periphery of the pressure relief valve 212. This means that all the first notches 212a are concentrated on the end side of the pressure relief valve 212. When the first notch 212a is opened by the gas pressure inside the battery cell 20, the gas inside the battery cell 20 is ejected through the first notch 212a. This achieves the effect of guiding the gas to the end side, reducing the possibility that the gas inside the battery cell 20 is directly ejected in the direction perpendicular to the valve plate of the pressure relief valve 212. This reduces the risk that the material inside the battery cell 20 will be reflected back by the component opposite to the end cap assembly 21 and directly block the pressure relief port 211a.

[0071] The technical solution of this application provides a pressure relief port 211a on the cover plate body 211, and a pressure relief valve 212 blocks the pressure relief port 211a. The pressure relief valve 212 is provided with a groove, which is defined as the first groove 212a. When the internal pressure value of the battery cell 20 is normal, the pressure relief valve 212 provides a good sealing effect. However, when a short circuit or excessive temperature occurs inside the battery cell 20, the internal pressure increases to the point that it can break open the first groove 212a on the pressure relief valve 212, thereby forming an opening at the first groove 212a to relieve pressure inside the battery cell 20.

[0072] The pressure relief valve 212 has a center point o and multiple center lines a1 passing through the center point o. The extension direction of the center lines a1 is set at an angle to the orientation of the pressure relief port 211a. All the first notches 212a are concentrated in the same orientation of at least one of the center lines a1 and are set close to the periphery of the pressure relief valve 212. This makes all the first notches 212a close to the end side of the pressure relief valve 212, thereby guiding the material to be ejected to concentrate on the end side of the pressure relief valve 212 and eject it from the end side of the pressure relief valve 212. This achieves the effect of guiding the ejected material to be ejected to both sides of the battery cell 20, reducing the risk that the material to be ejected will be directly sprayed onto the component corresponding to the end cap assembly 21 of the battery cell 20, and thus reducing the risk that other components will reflect the ejected material and block the pressure relief port 211a.

[0073] Please refer to the reference. Figures 2 to 4 In one embodiment of this application, the first notch 212a is arc-shaped, and the center of the first notch 212a is located on the side of the first notch 212a facing the center point o.

[0074] By making the first notch 212a arc-shaped, the force on the first notch 212a is made uniform throughout, so that when the internal air pressure of the battery cell 20 is high, the first notch 212a can be easily broken open completely. In addition, by placing the center of the first notch 212a on the side of the first notch 212a facing the center point o, the part of the pressure relief valve 212 located on the side of the first notch 212a near the center point o can deform and form an opening away from the center point o. This further guides the material to be ejected from inside the battery cell 20 to be ejected at an angle away from the center point o, further reducing the risk of the ejected material being reflected back by the component directly opposite the cover body 211.

[0075] Please refer to the reference. Figures 2 to 4 In one embodiment of this application, the pressure relief valve 212 is elongated and has a first end and a second end that are disposed opposite to each other in its length direction x. The first notch 212a is provided at the first end or the second end.

[0076] If the pressure relief valve 212 is elongated, it can be a rectangular or oblong valve plate. Similarly, if the cover plate body 211 is a rectangular plate, and the pressure relief valve 212 is located at the pressure relief port 211a of the cover plate body 211, the length direction x of the pressure relief valve 212 can be the same as the length direction x of the cover plate body 211, or it can be set at an angle to the length direction x of the cover plate body 211. Of course, the cover plate body 211 can also be circular. When the pressure relief valve 212 is located at the pressure relief port 211a of the cover plate body 211, the length direction x of the pressure relief valve 212 is parallel to a diameter direction of the cover plate body 211, and the projection of the center point o of the cover plate body 211 can fall on or outside the pressure relief valve 212.

[0077] The pressure relief valve 212 is elongated, with a first end and a second end positioned opposite each other along its length x. By placing the first notch 212a at either the first or second end, the length of the first notch 212a is shortened, facilitating the passage of material inside the battery cell 20 through the first notch 212a and achieving the effect of timely pressure relief within the battery cell 20. Furthermore, this design allows the pressure relief valve 212 to easily bend and deform towards the second end when the first notch 212a is breached, further enhancing the stability of the pressure relief.

[0078] Please refer to the reference. Figure 2 and Figure 5 In one embodiment of this application, the cover plate body 211 is further provided with a liquid injection hole 211b, which is spaced apart from the pressure relief port 211a; the end cap assembly 21 also includes a sealing plug 213, which seals the liquid injection hole 211b.

[0079] The injection hole 211b can be circular, rectangular, or other shapes. The injection hole 211b can be manufactured by stamping or laser cutting.

[0080] The sealing plug 213 can be a sealing pin or a sealing cap, etc. The sealing plug 213 can achieve the effect of sealing the injection hole 211b by means of interference fit, or it can be glued to the injection hole 211b with sealant, etc.

[0081] By spacing the injection port and the pressure relief port 211a apart, the risk of clogging the pressure relief port 211a after injection through the injection port can be reduced. By sealing the injection hole 211b with the sealing plug 213, after the battery cell 20 is injected with liquid through the injection hole 211b, the sealing plug 213 can seal and protect the inside of the battery cell 20, reducing the risk of dust or moisture entering the battery cell 20 through the injection hole 211b and affecting the performance of the battery cell 20.

[0082] Please refer to the reference. Figure 2 and Figure 5 In one embodiment of this application, the sealing plug 213 is located on the side of the pressure relief valve 212 away from the first notch 212a.

[0083] By placing the sealing plug 213 on the side of the pressure relief valve 212 away from the first notch 212a, the risk of material inside the battery cell 20 being ejected onto the sealing plug 213 during the pressure relief process can be reduced, thereby reducing the need to replace the sealing plug 213.

[0084] Please refer to the reference. Figure 2 , Figure 5 as well as Figure 6 In one embodiment of this application, the sealing plug 213 is provided with a second notch 213a.

[0085] In this embodiment, the second notch 213a on the sealing plug 213 can be located on the end side of the sealing plug 213 or in the middle of the sealing plug 213. The second notch 213a can be evenly spaced or continuously arranged along the periphery of the sealing plug 213, and the second notch 213a can be annular, arc-shaped, straight, cross-shaped, or other shapes. The depth of the second notch 213a can be the same as or different from the depth of the first notch 212a. It is understood that in order to achieve the effect that the air pressure inside the battery cell 20 can force open the second notch 213a, the second notch 213a refers to a groove formed by recessing along the direction of the injection hole 211b.

[0086] By providing a second notch 213a on the sealing plug 213, the sealing plug 213 can serve as a backup pressure relief structure when the aforementioned pressure relief valve 212 fails. This allows the sealing plug 213 to break through the second notch 213a when the internal air pressure of the battery cell 20 is too high, thereby achieving the effect of relieving pressure inside the battery cell 20.

[0087] In addition, by providing a second notch 213a on the sealing plug 213, it can also serve as a pressure relief structure, thereby reducing the volume of the pressure relief valve 212 and thus reducing the size of the pressure relief port 211a on the cover plate body 211, thereby improving the strength of the cover plate body 211.

[0088] Specifically, the size of the reduced pressure relief port 211a can be no larger than the projected size of the sealing plug 213 on the cover plate body 211, so as to ensure a better pressure relief effect.

[0089] Please refer to the reference. Figure 2 , Figure 5 as well as Figure 6 In one embodiment of this application, the sealing plug 213 has at least two parallel injection holes 211b with their openings facing a central surface A, and the second groove 213a is concentrated on one side of at least one central surface A.

[0090] For example, when the projection of the sealing plug 213 onto the plane of the larger plate surface of the parallel cover body 211 is circular, the center surface A is a surface of any diameter passing through the projection, and the center surface A is parallel to the opening orientation of the injection hole 211b. When the projection of the sealing plug 213 onto the plane of the larger plate surface of the parallel cover body 211 is rectangular, the center surface A is a surface passing through the center line of the rectangular projection, and the center surface A is parallel to the opening orientation of the injection hole 211b.

[0091] By concentrating the second notch 213a on one side of at least one central surface A, the second notch 213a is concentrated on one end of the sealing plug 213, which facilitates the guidance of the material ejected from inside the battery cell 20 to be ejected toward the end of the end cap assembly 21, thereby reducing the risk of being blocked by the liquid injection hole 211b due to reflection from the component facing the end cap assembly 21.

[0092] In one embodiment of this application, the depth of the second notch 213a is less than the depth of the first notch 212a.

[0093] By setting the depth of the second notch 213a to be less than the depth of the first notch 212a, the strength at the second notch 213a is greater than the strength at the first notch 212a. Therefore, when the internal gas pressure of the battery reaches the first threshold, the first notch 212a can be opened to achieve a pressure relief effect, thus reducing the risk of damaging the sealing plug 213. When the pressure relief valve 212 fails, and the internal gas pressure of the battery reaches the second threshold (the second threshold is greater than the first threshold), the second notch 213a can be opened to achieve a pressure relief effect, thereby ensuring that the sealing plug 213 on the end cap assembly 21 serves as a backup pressure relief structure, reducing the risk of pressure relief failure of the battery cell 20.

[0094] like Figure 5 As shown, in one embodiment of this application, the second notch 213a is provided on the side of the sealing plug 213 away from the pressure relief valve 212.

[0095] By placing the second notch 213a on the side of the sealing plug 213 away from the pressure relief valve 212, the second notch 213a is positioned on the sealing plug 213 at the position furthest from the pressure relief valve 212. This reduces the risk of material ejected from the first notch 212a of the pressure relief valve 212 spraying towards the second notch 213a, thereby ensuring the stability of the sealing plug 213 as a backup pressure relief structure.

[0096] like Figure 5 As shown, in one embodiment of this application, the second notch 213a is arc-shaped, and the center of the second notch 213a is located on the side of the second notch 213a facing the center of the sealing plug 213.

[0097] By making the second notch 213a arc-shaped, the force on the second notch 213a is made uniform throughout, so that when the pressure relief valve 212 fails and the internal air pressure of the battery cell 20 is high, the second notch 213a can be easily completely opened. In addition, by placing the center of the second notch 213a on the side of the second notch 213a facing the center of the sealing plug 213, the part of the sealing plug 213 located on the side of the second notch 213a near the center of the sealing plug 213 can deform and form an opening away from the center of the sealing plug 213. This further guides the material to be ejected from inside the battery to be ejected at an angle away from the center of the sealing plug 213, further reducing the risk of the ejected material being reflected back by the component directly opposite the cover body 211.

[0098] By placing the second notch 213a on the side away from the pressure relief valve 212, and by placing the center of the second notch 213a on the side of the second notch 213a facing the center of the sealing plug 213, the risk of material ejected from inside the battery cell 20 clogging the pressure relief port 211a can also be reduced.

[0099] Please refer to the reference. Figures 2 to 6 This application also proposes a battery device 100. The battery device 100 includes a battery cell 20, the specific structure of which is described in the above embodiments. Since this battery cell 20 employs all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the above embodiments, and will not be elaborated upon here. Specifically, the battery device 100 can be the aforementioned battery cell 20.

[0100] Furthermore, the battery device 100 may also include a circuit board, which is disposed opposite to the end cap assembly 21 in the battery cell 20. Since the specific structure of the end cap assembly 21 refers to the above embodiment, when a short circuit or excessive temperature occurs inside the battery cell 20, its internal pressure increases to the point that it can break open the first notch 212a on the pressure relief valve 212, thereby forming an opening at the first notch 212a to relieve pressure inside the battery cell 20. Since the pressure relief valve 212 has a center point o and multiple center lines a1 passing through the center point o, and the extension direction of the center line a1 is set at an angle to the orientation of the pressure relief port 211a, and all the first marks 212a are concentrated in the same orientation of at least one of the center lines a1 and are set close to the periphery of the pressure relief valve 212, all the first marks 212a are close to the end side of the pressure relief valve 212, thereby guiding the material to be ejected to concentrate on the end side of the pressure relief valve 212 and eject it from the end side of the pressure relief valve 212, thereby achieving the effect of guiding the ejected material to be ejected to both sides of the battery cell 20, reducing the risk of the material to be ejected directly spraying onto the circuit board, and thus reducing the risk of the circuit board reflecting the ejected material onto the end cap assembly 21 and blocking the pressure relief port 211a.

[0101] Alternatively, the battery device 100 may include at least two battery cells 20, which may be arranged opposite to each other, with the end cap assembly 21 of one battery cell 20 facing the other battery cell 20. Since the specific structure of the end cap assembly 21 of the battery cell 20 refers to the above embodiment, when a short circuit or excessive temperature occurs inside one of the battery cells 20, its internal pressure increases to the point that it can force open the first notch 212a on the pressure relief valve 212, thereby forming an opening at the first notch 212a to release pressure inside the battery cell 20. Since the pressure relief valve 212 has a center point o and multiple center lines a1 passing through the center point o, and the extension direction of the center line a1 is set at an angle to the orientation of the pressure relief port 211a, and all the first marks 212a are concentrated in the same orientation of at least one of the center lines a1 and are set close to the periphery of the pressure relief valve 212, all the first marks 212a are close to the end side of the pressure relief valve 212, thereby guiding the material to be ejected to concentrate on the end side of the pressure relief valve 212 and eject it from the end side of the pressure relief valve 212, thereby achieving the effect of guiding the ejected material to be ejected to both sides of the battery cell 20, reducing the risk that the material to be ejected will be directly sprayed onto the other battery cell 20 opposite to it, thereby reducing the risk that the other battery cell 20 opposite to it will reflect the ejected material onto the end cap assembly 21 and block the pressure relief port 211a on the end cap assembly 21.

[0102] Please refer to the reference. Figures 1 to 6 This application also proposes an electrical device. The electrical device includes a battery device 100, the specific structure of which is described in the above embodiments. Since this electrical device employs all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here. Specifically, the electrical device can be any of the aforementioned devices or systems using the battery device 100.

[0103] The above are merely exemplary embodiments of this application and do not limit the patent scope of this application. Any equivalent structural transformations made based on the technical concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A battery cell, characterized in that, Includes an end cap assembly, the end cap assembly comprising: The cover plate body, wherein the cover plate body is provided with a pressure relief port; and A pressure relief valve is provided, which blocks the pressure relief port; the pressure relief valve is provided with a groove, which is defined as the first groove; the pressure relief valve has a center point and multiple center lines that form an angle with the orientation of the pressure relief port; the multiple center lines extend in different directions and intersect at the center point; each center line has two opposing orientations with the center point as the origin; all the first grooves are concentrated on the same orientation of at least one of the center lines and are located near the periphery of the pressure relief valve.

2. The battery cell as described in claim 1, characterized in that, The first notch is arc-shaped, and the center of the first notch is located on the side of the first notch facing the center point.

3. The battery cell as described in claim 1, characterized in that, The pressure relief valve is elongated and has a first end and a second end that are arranged opposite to each other along its length. The first groove is located at the first end or the second end.

4. The battery cell according to any one of claims 1 to 3, characterized in that, The cover plate body is also provided with a liquid injection hole, which is spaced apart from the pressure relief port; the end cap assembly also includes a sealing plug, which seals the liquid injection hole.

5. The battery cell as described in claim 4, characterized in that, The sealing plug is located on the side of the pressure relief valve away from the first notch.

6. The battery cell as described in claim 5, characterized in that, The sealing plug has a second notch.

7. The battery cell as described in claim 6, characterized in that, The sealing plug has at least two central faces with openings parallel to the injection holes, and the second groove is concentrated on one side of at least one of the central faces; And / or, the depth of the second notch is less than the depth of the first notch.

8. The battery cell as described in claim 7, characterized in that, The second notch is located on the side of the sealing plug away from the pressure relief valve.

9. The battery cell as described in claim 7, characterized in that, The second notch is arc-shaped, and the center of the second notch is located on the side of the second notch facing the center of the sealing plug.

10. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1 to 9.

11. An electrical appliance, characterized in that, Includes the battery device as described in claim 10.

Images