Battery cell, battery, and electric device

Abstract

The application provides a battery monomer, a battery and a power utilization device. The battery monomer comprises an electrode assembly (30), an end cover assembly (40) comprising an end cover (41) provided with a liquid injection hole (411), and a shielding assembly (50) covering the liquid injection hole (411). By arranging the shielding assembly (50), the shielding assembly (50) covers the liquid injection hole (411), so that when electrolyte is injected, the shielding assembly (50) can bear the impact force of the injected electrolyte, the electrolyte is prevented from directly washing the electrode assembly (30), and the diaphragm is prevented from being folded due to the washing of the electrolyte.

Description

Technical Field

[0001] This application belongs to the field of battery technology, and more specifically, relates to a battery cell, a battery, and an electrical device. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] During the manufacturing process of a battery cell, after the electrode assembly is installed in the casing, electrolyte needs to be injected through the injection hole of the end cap. When the electrolyte is injected, it impacts the electrode assembly, causing the separator to fold over and expose the electrode plates. This causes the tabs to overlap with the end faces of the electrode plates, resulting in self-discharge problems. Summary of the Invention

[0004] The purpose of this application is to provide a battery cell, a battery, and an electrical device to solve the problem in the related art where the injection of electrolyte causes the electrode assembly to be impacted, resulting in the membrane folding.

[0005] In a first aspect, embodiments of this application provide a battery cell, including: an electrode assembly; an end cap assembly including an end cap having a liquid injection hole; and a shielding assembly disposed on the side of the end cap facing the electrode assembly and covering the liquid injection hole.

[0006] In the technical solution of this application embodiment, a shielding component is provided to cover the injection hole on the end cap. When electrolyte is injected from the injection hole, the electrolyte directly impacts the shielding component, causing the shielding component to withstand the impact force of the injected electrolyte. This disperses and buffers the injected electrolyte, preventing the electrolyte from directly scouring the electrode assembly. Consequently, it avoids the diaphragm from folding due to electrolyte scouring, reduces the risk of self-discharge caused by the overlap of the tab and the end face of the electrode, improves safety, and extends service life.

[0007] In some embodiments, the shielding component is bonded to the end cap so that the electrolyte injected through the injection hole can partially detach the shielding component from the end cap.

[0008] The shielding assembly is bonded to the end cap to facilitate its installation. This ensures that the shielding assembly covers the injection hole during assembly, and that the impact force of the electrolyte during injection can separate the area where the shielding assembly is connected to the end cap to allow for electrolyte injection.

[0009] In some embodiments, the shielding assembly includes a shielding member covering the injection hole and a buffer member supporting the shielding member, the buffer member being connected to the electrode assembly. By providing a shielding member to block the injection hole and a buffer member to support the shielding member, the shielding member absorbs the impact force of the electrolyte during injection, while the buffer member supports the shielding member. This enhances the shielding member's ability to withstand the impact of the electrolyte, resulting in better electrolyte dispersion and facilitating electrolyte injection.

[0010] In some embodiments, the buffer is elastic. Thus, the buffer can elastically support the shield, providing elastic cushioning when the electrolyte impacts the shield, allowing the shield to better disperse the electrolyte and facilitating electrolyte injection.

[0011] In some embodiments, the shielding member is a sheet-like structure. Using a sheet-like structure reduces space requirements, increases the capacity density of individual battery cells, and facilitates installation. Furthermore, the sheet-like structure of the shielding member also facilitates adhesion to the end cap to block the electrolyte injection hole. This allows the electrolyte to better impact the area where the shielding member is bonded to the end cap during electrolyte addition, preventing the shielding member from detaching.

[0012] In some embodiments, the shielding member is elastic. When the electrolyte impacts the shielding member, the shielding member can act as an elastic buffer to better disperse the electrolyte and facilitate the injection of the electrolyte.

[0013] In some embodiments, the shielding member is provided with buffer members at opposite ends along the width direction of the end cap, and the buffer members are sheet-like structures integrally formed with the shielding member.

[0014] Buffer components are provided at opposite ends of the shielding component to provide more stable support. The buffer components are designed as sheet-like structures and are integrally molded with the shielding component, which facilitates processing and manufacturing, reduces costs, and also makes assembly easier.

[0015] In some embodiments, the buffer member is bent and connected to the electrode assembly. Bending the buffer members at both ends of the shield and connecting them to the electrode assembly not only protects the electrode assembly but also provides elastic support for the shield, allowing the shield to better disperse the electrolyte and preventing the electrode assembly from being washed away during electrolyte addition.

[0016] In some embodiments, the battery cell includes a plurality of the electrode assemblies. The plurality of electrode assemblies are divided into two groups, and the buffer member is bent to be connected to two adjacent electrode assemblies near the liquid injection hole. By providing a plurality of electrode assemblies, they can be integrated when manufacturing the battery cell. Dividing the plurality of electrode assemblies into two groups facilitates assembly. Bending the buffer members at both ends of the shielding member to be connected to two adjacent electrode assemblies near the liquid injection hole can elastically support the shielding member, enabling the shielding member to better disperse the electrolyte and preventing the electrolyte from flushing the electrode assemblies when injecting the electrolyte.

[0017] In some embodiments, the length of the shielding assembly is L, and it satisfies: 2 mm ≤ L1 + 1.5 * H - L ≤ 6 mm, where L1 is the distance between the two groups of electrode assemblies when they are unfolded at the same height and parallel to the side of the end cap, and H is the thickness of the electrode assembly. This length specification of the shielding assembly can ensure that both ends of the shielding assembly can be connected to two adjacent electrode assemblies near the liquid injection hole, and the two ends of the shielding assembly will not exceed the sides of the corresponding electrode assemblies. In this way, after the two groups of electrode assemblies are combined, interference at both ends of the shielding assembly can be avoided.

[0018] In some embodiments, the shielding assembly has opposite first and second sides along the length direction of the end cap. The first side and the second side are respectively located on opposite sides of the liquid injection hole. The distance from the first side to the liquid injection hole is less than or equal to the distance from the second side to the liquid injection hole. The distance between the first side and the liquid injection hole is d, and 0 < d < 20 mm. By setting an interference distance d between one side of the shielding assembly and the liquid injection hole, the buffering ability of the shielding assembly for the injected electrolyte can be improved, better dispersing the electrolyte and preventing the electrolyte from directly flushing the electrode assemblies.

[0019] In some embodiments, the electrode assembly is provided with electrode tabs of opposite polarities. The second side of the shielding assembly is attached to the adjacent electrode tab, and the first side of the shielding assembly is spaced from the other electrode tab. This can make the resistance for the injected electrolyte to flush open the shielding assembly and reach the adjacent electrode tab greater, reducing the impact force of the electrolyte on the electrode tab. When the electrolyte reaching the electrode tab flows along the electrode tab to the electrode assembly, it can better prevent the electrolyte from flushing and folding the separator.

[0020] In some embodiments, a flow guiding groove is provided on the surface of the end cap facing the shielding assembly. One end of the flow guiding groove is connected to the liquid injection hole, and the shielding assembly covers at least a part of the flow guiding groove.

[0021] By setting up the flow channel, when the electrolyte is injected, the shielding component buffers the electrolyte, allowing the electrolyte to enter the flow channel more easily. The flow channel guides and disperses the electrolyte to the set position, facilitating the addition of electrolyte and preventing the electrolyte from washing away the electrode assembly.

[0022] In some embodiments, the flow channel includes a first flow channel, one end of which communicates with the injection hole, and the other end of which extends out from one side of the shielding assembly along the length of the end cap. By providing the first flow channel, more electrolyte can be guided to flow out from the side away from the adjacent tab during electrolyte injection, thus facilitating electrolyte addition and reducing the impact on the adjacent tab.

[0023] In some embodiments, the flow channel includes a second flow channel, one end of which communicates with the injection hole, and the other end of which is adjacent to the side of the end cap in the width direction; alternatively, the other end of the second flow channel extends to the side of the end cap in the width direction. By providing the second flow channel, the electrolyte can be guided to flow towards the side of the end cap during injection, thereby dispersing the electrolyte, facilitating electrolyte addition, and allowing the electrode assembly to absorb the electrolyte more evenly.

[0024] In some embodiments, the electrode assembly has tabs of opposite polarity, the end cap assembly further includes electrode terminals respectively connected to the tabs of opposite polarity, the electrode terminals are mounted on the end cap, and the battery cell further includes adapter pieces respectively connected to each of the electrode terminals, each adapter piece is connected to the corresponding tab, and the connection area between each tab and the corresponding adapter piece is covered with an insulating sheet.

[0025] An adapter plate is provided to connect the tab to the corresponding electrode terminal, facilitating a more secure connection. An insulating sheet is used to cover the connection area between the tab and the adapter plate, protecting the connection point and preventing it from affecting the electrode assembly, thus improving the safety of battery manufacturing.

[0026] In some embodiments, the end cap assembly further includes a spacer supporting the end cap, with the shielding assembly spaced apart from the spacer. The spacer provides better support for the end cap and improves battery manufacturing safety. By spacing the side of the shielding assembly from the spacer, during electrode assembly installation, the spacer can prevent it from pushing against the shielding assembly, ensuring the shielding assembly fits snugly against the end cap.

[0027] In some embodiments, the distance between the side of the shielding component and the end of the isolator near the shielding component is greater than 3 mm. This ensures that the isolator will not push against the shielding component during electrode assembly installation, and that the shielding component fits snugly against the end cap.

[0028] Secondly, embodiments of this application provide a battery, including a battery cell as described in the above embodiments.

[0029] Thirdly, embodiments of this application provide an electrical device, including a battery as described in the above embodiments.

[0030] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application 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 application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or exemplary technologies 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 these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0033] Figure 2 This is an exploded structural diagram of a battery according to some embodiments of this application;

[0034] Figure 3 This is an exploded structural diagram of a battery cell according to some embodiments of this application;

[0035] Figure 4 This is a schematic diagram of the structure of a battery cell before it is assembled into a core, according to some embodiments of this application;

[0036] Figure 5 for Figure 4 A side view of the battery cell structure before assembly;

[0037] Figure 6 for Figure 4 A side view of the battery cell structure after assembly.

[0038] Figure 7 This is a side view of the battery cell after assembly according to some embodiments of this application;

[0039] Figure 8 This is a schematic diagram of the structure of a battery cell before it is assembled into a core, according to some embodiments of this application;

[0040] Figure 9 This is a schematic diagram of the structure of a battery cell before it is assembled into a core, according to some embodiments of this application;

[0041] Figure 10 This is a schematic diagram of the structure of a battery cell before it is assembled into a core, according to some embodiments of this application;

[0042] Figure 11 This is a schematic diagram of the structure of a battery cell before it is assembled into a core, according to some embodiments of this application;

[0043] Figure 12 This is a schematic diagram of the structure of a battery cell before it is assembled into a core, according to some embodiments of this application;

[0044] Figure 13 This is a schematic diagram of the structure of a battery cell before it is assembled into a core, according to some embodiments of this application;

[0045] Figure 14 This is a schematic diagram of the electrode assembly in a battery cell according to some embodiments of this application;

[0046] Figure 15 This is a schematic diagram of the electrode assembly in a battery cell according to some embodiments of this application;

[0047] Figure 16 This is a schematic diagram of the electrode assembly in a battery cell according to some embodiments of this application;

[0048] Figure 17 This is a side view of the battery cell after assembly according to some embodiments of this application;

[0049] Figure 18 This is a side view of a battery cell according to some embodiments of this application.

[0050] The main markings in the attached figures are as follows:

[0051] 1000 - Vehicle; 1001 - Battery; 1002 - Controller; 1003 - Motor;

[0052] 100 - Box body; 101 - First part; 102 - Second part;

[0053] 200-cell battery;

[0054] 30 - Electrode assembly; 301 - First end; 302 - Second end; 31 - Tab; 311 - First tab; 312 - Second tab;

[0055] 40 - End cap assembly; 41 - End cap; 411 - Injection hole; 412 - Flow guide groove; 4121 - First flow guide groove; 4122 - Second flow guide groove; 4123 - Third flow guide groove; 42 - Electrode terminal; 421 - First electrode terminal; 422 - Second electrode terminal; 43 - Adapter piece; 431 - First adapter piece; 432 - Second adapter piece; 44 - Isolator; 45 - Insulating sheet;

[0056] 50 - Shielding assembly; 51 - Shielding component; 511 - First side; 512 - Second side; 52 - Buffer component;

[0057] 61-Insulating tape; 611-Opening;

[0058] 70 - Housing. Detailed Implementation

[0059] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0060] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0061] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0062] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments in any suitable manner.

[0063] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0064] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces). "Several" means one or more, unless otherwise explicitly specified.

[0065] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0066] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0067] In the description of the embodiments of this application, unless otherwise expressly specified and limited, when an element is referred to as "fixed to" or "set on" another element, it may be directly on or indirectly on the other element. When an element is referred to as "connected to" another element, it may be directly connected to or indirectly connected to the other element.

[0068] In the description of the embodiments in this application, unless otherwise expressly specified and limited, the technical term "proximity" refers to being close in location. For example, among three components A1, A2, and B, the distance between A1 and B is greater than the distance between A2 and B. Therefore, A2 is closer to B than A1, meaning A2 is adjacent to B, or B is adjacent to A2. Similarly, when there are multiple components C, namely C1, C2, ..., C... N If one of the C components, such as C2, is closer to the B component than the other C components, then B is adjacent to C2, or C2 is adjacent to B.

[0069] The battery cells in this application may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application are not limited to these. Battery cells may be cylindrical, flat, cuboid, or other shapes, and the embodiments of this application are not limited to these shapes either. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and the embodiments of this application are not limited to these types either.

[0070] The battery mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application may include a battery module or a battery pack. A battery generally includes a housing for encapsulating one or more battery cells. The housing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0071] In a battery, when there are multiple battery cells, these cells can be connected in series, parallel, or a combination thereof. A combination thereof means that multiple battery cells are connected in both series and parallel configurations. Multiple battery cells can be directly connected in series, parallel, or a combination thereof, and then the entire assembly of these cells is housed within a casing. Alternatively, a battery can consist of multiple battery cells first connected in series, parallel, or a combination thereof to form a battery module, and then these modules are connected in series, parallel, or a combination thereof to form a whole, which is then housed within a casing. The battery may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells.

[0072] The battery cell in this application embodiment includes an electrode assembly, an end cap, and a housing.

[0073] Electrode assemblies, also known as bare cells, consist of a positive electrode, a negative electrode, and a separator. They primarily function by the movement of metal ions between the positive and negative electrodes. The positive electrode includes a positive current collector and a positive active material layer. The active material layer is coated on the surface of the current collector. The uncoated portion of the current collector protrudes beyond the coated portion, serving as the positive electrode tab. Alternatively, a metal conductor can be soldered onto the current collector and led out to act as the positive electrode tab. Taking lithium-ion batteries as an example, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The portion of the negative current collector not coated with the negative active material layer protrudes beyond the portion coated with the negative active material layer. This uncoated portion serves as the negative electrode tab. Alternatively, a metal conductor can be soldered onto the negative current collector and led out to serve as the negative electrode tab. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc. To ensure that a large current can pass through without melting, there are multiple positive electrode tabs stacked together, and there are multiple negative electrode tabs stacked together. Understandably, in the electrode assembly, there can be one positive electrode tab and one negative electrode tab. That is, the electrode assembly has two sets of tabs, each set including at least one tab, with one set of tabs being the positive electrode tab and the other set being the negative electrode tab.

[0074] Electrode assemblies can be either wound or stacked structures. This application's embodiments are not limited to these. Wound structures typically involve welding tabs to the current collector, then arranging them in the order of positive electrode – separator – negative electrode – separator; and then winding them to form a cylindrical or square cell. Stacked structures typically involve leading tabs from the current collector, arranging the positive electrode, negative electrode, and separator in the order of positive electrode – separator – negative electrode – separator, and stacking them layer by layer to form a stacked cell; wherein, the separator can be cut and directly stacked as separator sheets, or the separator can be stacked in a Z-shaped fold without cutting it. The separator material can be PP or PE, etc. The separator is an insulating film placed between the positive and negative electrodes, its main function being to isolate the positive and negative electrodes and prevent electrons in the battery from freely passing through, preventing short circuits, while allowing ions in the electrolyte to freely pass between the positive and negative electrodes to form a circuit. The positive and negative electrodes are collectively referred to as electrodes. The positive electrode tab and the negative electrode tab are collectively referred to as electrode tabs.

[0075] After the electrode assembly is manufactured, it needs to be installed in the casing and injected with electrolyte to immerse it and allow for full absorption of the electrolyte. However, the injection of electrolyte generates an impact force. When the electrolyte impacts the electrode assembly, it can cause the separator to fold, exposing the electrode plates. This can lead to the tabs overlapping with the electrode plate ends, causing self-discharge. This self-discharge not only consumes electrical energy but can also pose a risk of internal short circuits, affecting battery performance and lifespan.

[0076] Based on the above considerations, in order to solve the problem of the separator folding caused by the electrolyte washing over the electrode assembly during the electrolyte filling process, this application provides a battery cell in which a shielding component is placed on the electrolyte filling hole on the end cap. This allows the shielding component to withstand the impact force of the injected electrolyte during the electrolyte filling process, and to disperse and buffer the injected electrolyte. This can prevent the electrolyte from directly washing over the electrode assembly, thereby preventing the separator from folding due to electrolyte washing, and improving the battery's performance and lifespan.

[0077] The battery cells disclosed in this application can be used in electrical devices that use batteries as a power source or in various energy storage systems that use batteries as energy storage elements, such as energy storage power systems for hydropower, thermal power, wind power, and solar power plants. Electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric bicycles, electric motorcycles, 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.

[0078] For ease of explanation, an electrical device is provided in one embodiment of this application, with a vehicle as an example.

[0079] 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. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. A battery 1001 is disposed inside the vehicle 1000, and the battery 1001 can be located at the bottom, front, or rear of the vehicle 1000. The battery 1001 can be used to power the vehicle 1000; for example, the battery 1001 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 1002 and a motor 1003. The controller 1002 is used to control the battery 1001 to supply power to the motor 1003, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0080] In some embodiments of this application, the battery 1001 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.

[0081] Please refer to Figure 2 , Figure 2 This is an exploded structural diagram of a battery 1001 provided in some embodiments of this application. The battery 1001 includes a housing 100 and a battery cell 200, with the battery cell 200 housed within the housing 100. The housing 100 provides a accommodating space for the battery cell 200, and the housing 100 can adopt various structures. In some embodiments, the housing 100 may include a first portion 101 and a second portion 102, which overlap each other, jointly defining a accommodating space for accommodating the battery cell 200. The second portion 102 may be a hollow structure with one open end, and the first portion 101 may be a plate-like structure, covering the open side of the second portion 102 so that the first portion 101 and the second portion 102 jointly define the accommodating space; alternatively, the first portion 101 and the second portion 102 may both be hollow structures with one open side, with the open side of the first portion 101 covering the open side of the second portion 102. Of course, the housing 100 formed by the first part 101 and the second part 102 can be of various shapes, such as a cylinder or a cuboid. Multiple battery cells 200 are connected in parallel, series, or mixed and placed inside the housing 100 formed by the first part 101 and the second part 102.

[0082] Please refer to Figure 3 , Figure 3 This is an exploded structural diagram of a battery cell 200 provided in some embodiments of this application. Please refer to it as well. Figures 4 to 6 , Figure 4 This is a schematic diagram of the structure of the battery cell 20 before it is assembled into a core, according to some embodiments of this application. Figure 5 This is a side view of the battery cell 200 before it is assembled into a core, according to some embodiments of this application. Figure 6 This is a side view of the battery cell 200 after being assembled into a core according to some embodiments of this application.

[0083] The battery cell 200 includes an electrode assembly 30, an end cap assembly 40, and a shielding assembly 50. The end cap assembly 40 includes an end cap 41 with an electrolyte injection hole 411 for adding electrolyte. The shielding assembly 50 covers the electrolyte injection hole 411, meaning the shielding assembly 50 is located on the side of the end cap 41 facing the electrode assembly 30 and blocks the electrolyte injection hole 411.

[0084] In some embodiments, the battery cell 200 further includes a housing 70, an electrode assembly 30 is mounted in the housing 70, and an end cap 41 covers the housing 70.

[0085] In some embodiments, the electrode assembly 30 is provided with two sets of tabs 31, the two sets of tabs 31 having opposite polarities. The end cap assembly 40 also includes two electrode terminals 42, which are respectively connected to the two sets of tabs 31. Each electrode terminal 42 is mounted on the end cap 41, and the end cap 41 supports the electrode terminal 42.

[0086] The electrode assembly 30 has two sets of tabs 31: one set of tabs 31 are positive tabs, and the other set of tabs 31 are negative tabs. One or more positive tabs can be provided on the electrode assembly 30. When there is only one positive tab on the electrode assembly 30, that single positive tab forms a set of tabs 31. When there are multiple positive tabs on the electrode assembly 30, these positive tabs are stacked together to form a set of tabs 31. Similarly, one or more negative tabs can be provided on the electrode assembly 30. When there is only one negative tab on the electrode assembly 30, that single negative tab forms a set of tabs 31. When there are multiple negative tabs on the electrode assembly 30, these negative tabs are stacked together to form a set of tabs 31.

[0087] End cap 41 refers to a component that covers the opening of housing 70 to isolate the internal environment of battery cell 200 from the external environment. The shape of end cap 41 can be adapted to the shape of housing 70 to fit on housing 70. Optionally, end cap 41 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that end cap 41 is not easily deformed when subjected to compression and impact, so that battery cell 200 can have higher structural strength and improved safety performance.

[0088] Electrode terminal 42 refers to a conductive element disposed on end cap 41. Electrode terminal 42 is connected to tab 31 of electrode assembly 30 to output electrical energy from battery cell 200 or to charge battery cell 200. Battery cell 200 generally has two electrode terminals 42, which are respectively connected to the positive and negative tabs of electrode assembly 30. The electrode terminal 42 connected to the positive tab is the positive electrode terminal, and the electrode terminal 42 connected to the negative tab is the negative electrode terminal. Electrode assembly 30 is connected to the electrode terminals 42 on end cap 41 to form battery cell 200. Of course, battery cell 200 may also include other functional components.

[0089] The housing 70 is an assembly used to cooperate with the end cap 41 to form the internal environment of the battery cell 200, wherein the formed internal environment can accommodate the electrode assembly 30, electrolyte, and other components. The housing 70 and the end cap 41 can be independent components. An opening can be provided on the housing 70, and the end cap 41 closes the opening to form the internal environment of the battery cell 200. The housing 70 can have various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 70 can be determined according to the specific shape and size of the battery cell 200. The material of the housing 70 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this.

[0090] A battery cell 200 may include one or more electrode components 30. When a battery cell 200 includes multiple electrode components 30, the multiple electrode components 30 are divided into two groups, each group including at least one electrode component 30. For example, if there are two electrode components 30, then the two electrode components 30 are divided into two groups. When the number of electrode components 30 is greater than two, then at least one group includes at least two electrode components 30, and the other group includes at least one electrode component 30. When the number of electrode components 30 is even, the number of electrode components 30 in both groups can be set to be the same.

[0091] When the battery cell 200 includes two sets of electrode assemblies 30, the two sets of electrode assemblies 30 are deployed relative to each other, such as... Figure 4 and Figure 5 As shown, this allows for the connection of the tabs 31 with the same polarity on each group of electrode assemblies 30 to the same electrode terminal 42, facilitating connection. After connecting each electrode assembly 30 to its corresponding electrode terminal 42, the shielding assembly 50 can be mounted on the end cap 41, covering the liquid injection hole 411 of the end cap 41. The two ends of the shielding assembly 50 are bent to connect with the end faces of the tabs 31 of two adjacent electrode assemblies 30. In other words, the two ends of the shielding assembly 50 are connected to the end faces of the tabs 31 of the two electrode assemblies 30 closest to the shielding assembly 50. To install the electrode assembly 30 into the housing 70, the two groups of electrode assemblies 30 need to be folded together, as shown... Figure 6 As shown, this allows each electrode assembly 30 to be installed in the housing 70. The state in which the two sets of electrode assemblies 30 are unfolded relative to each other is the state before core assembly. The state in which the two sets of electrode assemblies 30 are folded is the state after core assembly, and the process of folding the two sets of electrode assemblies 30 is called core assembly. In addition, when the battery cell 200 includes two sets of electrode assemblies 30, multiple electrode assemblies 30 can be integrated during the manufacturing of the battery cell 200, or the multiple electrode assemblies 30 can be divided into two groups for easy assembly.

[0092] In this embodiment, the shielding component 50 covers the injection hole 411 on the end cap 41. When electrolyte is injected through the injection hole 411, the shielding component 50 blocks the electrolyte. Due to the blocking effect of the shielding component 50, the electrolyte directly impacts the shielding component 50, causing the shielding component 50 to withstand the impact force of the injected electrolyte. This allows the shielding component 50 to absorb the impact energy of the electrolyte. The electrolyte then flows into the housing 70 through the gap between the shielding component 50 and the end cap 41, thus dispersing and buffering the injected electrolyte. This prevents the electrolyte from directly scouring the electrode assembly 30, thereby preventing the diaphragm from folding due to electrolyte scouring, reducing the risk of self-discharge caused by the overlap between the tab 31 and the electrode end face, improving safety and extending service life.

[0093] In some embodiments, the end cap 41 may also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 200 reaches a threshold. The end cap 41 can also be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this.

[0094] like Figure 3 As shown, the electrode assembly 30 has a height direction, a width direction and a thickness direction. In the figure, the Y direction is the height direction of the electrode assembly 30, the X direction is the width direction of the electrode assembly 30 and the Z direction is the thickness direction of the electrode assembly 30.

[0095] Please see Figures 3 to 5 For ease of description, the two opposite ends of the electrode assembly 30 are defined as the first end 301 and the second end 302, respectively. The tab 31 is located at the first end 301 of the electrode assembly 30; that is, the first end 301 of the electrode assembly 30 is the end where the tab 31 is located. The second end 302 is the end of the electrode assembly 30 opposite to the first end 301. The direction from the first end 301 to the second end 302 is the height direction (i.e., the Y direction) of the electrode assembly 30. The surface defined between the first end 301 and the second end 302 of the electrode assembly 30, and by the height direction (i.e., the Y direction) and width direction (i.e., the X direction) of the electrode assembly 30, is the side surface of the electrode assembly 30. Therefore, the electrode assembly 30 has two opposite side surfaces, and the normal direction of these two side surfaces is the thickness direction (i.e., the Z direction) of the electrode assembly 30.

[0096] The electrode terminals 42 on the end cap 41 are connected to the tabs 31 of the electrode assembly 30. During assembly, the end cap 41 is placed over the housing 70. The outer contour of the end cap 41 can be a rectangular or near-rectangular flat plate, and the corners of the end cap 41 can be rounded. Figure 3 and Figure 4As shown, the width direction of the end cap 41 is consistent with the thickness direction of the electrode assembly 30, and the length direction of the end cap 41 is consistent with the width direction of the electrode assembly 30. The two sides along the length direction of the end cap 41 are the two sides of the end cap 41, and the edge of one side of the end cap 41 is the side edge of the end cap 41. The two ends along the length direction of the end cap 41 are the two ends of the end cap 41. Since the shielding component 50 is attached to the end cap 41 along the thickness direction of the electrode assembly 30 (i.e., the width direction of the end cap 41), the width direction of the shielding component 50 is consistent with the length direction of the end cap 41.

[0097] The blocking component 50 has two opposite sides and two opposite sides, namely one side and the other side. The edge of one side of the blocking component 50 is called the one side edge of the blocking component 50, and the edge of the other side of the blocking component 50 is called the other side edge of the blocking component 50. For ease of description, one side of the blocking component 50 is defined as the first side, and the other side of the blocking component 50 is defined as the second side. Accordingly, one side edge of the blocking component 50 is defined as the first side edge 511, and the other side edge of the blocking component 50 is defined as the second side edge 512.

[0098] The electrode assembly 30 is provided with tabs 31 of opposite polarity. When the shielding assembly 50 covers the injection hole 411, the first side 511 and the second side 512 of the shielding assembly 50 are located on opposite sides of the injection hole 411, and the electrode assembly 30 is provided with two sets of tabs 31 of opposite polarity. When the injection hole 411 is located between the two sets of tabs 31 (i.e., the two sets of tabs 31 are located on opposite sides of the injection hole 411), or when the two sets of tabs 31 are located on the same side of the injection hole 411, there must be one set of tabs 31 that is closer to the second side 512 relative to the first side 511. For ease of description, the set of tabs 31 that is closer to the first side 511 relative to the second side 512 is called the first tab 311, and the set of tabs 31 that is closer to the second side 512 and farther away from the first side 511 is defined as the second tab 312. The electrode terminal 42 connected to the first tab 311 can be called the first electrode terminal 421, and the electrode terminal 42 connected to the second tab 312 can be called the second electrode terminal 422, for the purpose of distinction and description.

[0099] In some embodiments, please refer to Figure 3 and Figure 4The shielding component 50 can be bonded to the end cap 41, which facilitates connection and fixation of the shielding component 50, and makes assembly easier. It also ensures that the shielding component 50 covers the injection hole 411 on the end cap 41. In other words, the bonding strength between the shielding component 50 and the end cap 41 is set such that the electrolyte injected from the injection hole 411 can partially detach the shielding component 50 from the end cap 41. The bonding strength between the shielding component 50 and the end cap 41 is less than the pressure of the electrolyte injected into the injection hole 411. Bonding strength refers to the adhesive force borne per unit bonding surface. Pressure refers to the force borne per unit area. The bonding strength between the shielding component 50 and the end cap 41 is less than the pressure of the electrolyte injected into the injection hole 411. When the electrolyte is injected, the impact force of the electrolyte can separate the part of the shielding component 50 connected to the end cap 41, preventing the shielding component 50 from blocking the injection hole 411. In this way, the electrolyte can flow through these separated areas to allow for electrolyte injection.

[0100] In some embodiments, please refer to Figure 3 and Figure 4 The shielding assembly 50 includes a shielding member 51, which is bonded to the end cap 41 to ensure that the shielding member 51 covers the injection hole 411 on the end cap 41. The bonding strength between the shielding member 51 and the end cap 41 is set such that the electrolyte injected from the injection hole 411 can partially impact and detach the shielding member 51 from the end cap 41. The bonding strength between the shielding member 51 and the end cap 41 is less than the pressure of the electrolyte injected into the injection hole 411. During electrolyte injection, the impact force of the electrolyte can separate the area where the shielding member 51 is connected to the end cap 41, preventing the shielding member 51 from blocking the injection hole 411. This allows the electrolyte to flow through these separated areas for electrolyte injection.

[0101] When the shielding assembly 50 includes a shielding member 51, the shielding member 51 is attached to the end cap 41 along the thickness direction of the electrode assembly 30 (i.e., the width direction of the end cap 41), and the width direction of the shielding member 51 is consistent with the length direction of the end cap 41. The length direction of the shielding member 51 is consistent with the length direction of the shielding assembly 50, and the width direction of the shielding member 51 is consistent with the width direction of the shielding assembly 50. The first side of the shielding assembly 50 is also the first side of the shielding member 51, the second side of the shielding assembly 50 is also the second side of the shielding member 51, the first side edge 511 of the shielding assembly 50 is also the first side edge of the shielding member 51, and the second side edge 512 of the shielding assembly 50 is also the second side edge of the shielding member 51.

[0102] In some embodiments, the shielding assembly 50 includes a shielding member 51 and a buffer member 52. The buffer member 52 can be mounted on the electrode assembly 30 and supports the shielding member 51. The buffer member 52 supports the shielding member 51 on the electrode assembly 30, which can support the shielding member 51 more stably. When adding electrolyte, it can improve the shielding member 51's resistance to electrolyte impact and better prevent the shielding member 51 from falling off.

[0103] In some embodiments, the buffer 52 can be an elastic member to elastically support the shield 51, so that when electrolyte is added, the shield 51 can elastically buffer the electrolyte when the electrolyte flows into the housing 70 through the shield 51. When the addition stops, the shield 51 can block the injection hole 411 again to prevent impurities from entering the housing 70.

[0104] Understandably, the buffer 52 can also be a rigid component to stably support the shield 51 and improve the shield 51's ability to withstand electrolyte impact.

[0105] In some embodiments, please refer to Figure 3 and Figure 4 The shielding member 51 has a sheet-like structure, which reduces the space occupied, increases the capacity density of the battery cells, and facilitates the bonding of the shielding member 51 to the end cap 41. Furthermore, when electrolyte impacts the shielding member 51, it can partially open to allow for electrolyte filling, and it prevents the shielding member 51 from detaching from the end cap 41. Understandably, the shielding member 51 can also use other shapes such as a plate.

[0106] In some embodiments, please refer to Figure 3 and Figure 4 The shielding member 51 can be an elastic structure. That is, the shielding member 51 has elastic properties, allowing it to elastically support the end cap 41 after assembly, particularly by elastically covering the injection hole 411. During electrolyte injection, the shielding member 51 elastically buffers the electrolyte, better absorbing its impact energy and buffering and dispersing it, preventing direct scouring of the electrode assembly 30 by the electrolyte, thus avoiding diaphragm folding due to electrolyte scouring. Because the shielding member 51 can elastically deform, it also facilitates electrolyte injection, improving injection efficiency. Furthermore, this structure protects the shielding member 51, preventing it from detaching from the end cap 41. Understandably, the shielding member 51 can also be a flexible diaphragm. The flexible diaphragm is attached to the end cap 41. When electrolyte is added, only a part of the area where the shielding member 51 is attached to the end cap 41 will be washed away by the electrolyte. This will not cause the shielding member 51 to fall off. Moreover, the shielding member 51 can also buffer and disperse the added electrolyte to prevent the electrolyte from directly washing the electrode assembly 30.

[0107] In some embodiments, please refer to Figure 3 and Figure 4 The shield 51 can be elastic and adhered to the end cap 41. During assembly, the shield 51 can be installed conveniently. When adding electrolyte, the shield 51 can provide elastic buffering for the electrolyte as it flows through the shield 51 into the housing 70. When adding electrolyte, the shield 51 can block the injection hole 411 again to prevent impurities from entering the housing 70.

[0108] In some embodiments, the buffer 52 may be a sheet-like structure to reduce the space occupied by the buffer 52. It is understood that the buffer 52 may also be a columnar member or the like.

[0109] In some embodiments, when the buffer 52 is an elastic member, it can be a sheet-like structure with elasticity, which allows the buffer 52 to be bent and its two ends to be connected to the shield 51 and the electrode assembly 30 respectively to support the shield 51. Understandably, the buffer 52 can also be an elastic rubber column.

[0110] In one embodiment, the shielding assembly 50 includes a shielding member 51 and a buffer member 52. The shielding member 51 has buffer members 52 at both ends along the length of the end cap 41. The buffer members 52 and the shielding member 51 are integrally formed for easy processing and installation.

[0111] In one embodiment, when both the blocking member 51 and the buffer member 52 are sheet-like structures, the buffer member 52 can be integrally formed with the blocking member 51, and the buffer members 52 can be respectively provided at both ends of the blocking member 51 along its length. That is, the blocking assembly 50 is a sheet-like structure as a whole. It can be understood that the blocking member 51 and the buffer member 52 can also be provided separately, and then the buffer member 52 can be bonded to the blocking member 51.

[0112] The shielding component 50 has a sheet-like structure, meaning that the buffer 52 and the shielding component 51 are integrally formed as a sheet, occupying little space, easy to manufacture, easy to install and use, and low in cost. The shielding component 50 can be a diaphragm with insulating properties, such as a resin sheet like PET (polyethylene glycol terephthalate) or other plastic sheets. The shielding component 51 forms in the middle of the length direction, while the buffer 52 forms at both ends. Alternatively, a long insulating strip can be cut to obtain the shielding component 50. The shielding component 50 has a length direction and a width direction. The two ends of the length direction are the two ends of the shielding component 50, the two sides are the two sides of the shielding component 50, and the edge of one side is the side edge of the shielding component 50. The length direction of the shielding component 50 is consistent with the width direction of the end cap 41.

[0113] In some embodiments, when there are multiple electrode assemblies 30 and they are divided into two groups, the buffer members 52 at the opposite ends of the shielding member 51 are bent and connected to the two electrode assemblies 30 adjacent to the injection hole 411. This allows the shielding member 51 to protect the electrode assemblies 30, especially when adding electrolyte. The shielding member 51 can disperse the electrolyte to the edge of the electrode assembly 30 to better disperse the electrolyte and prevent it from scouring the electrode assembly 30 during electrolyte addition. In addition, when the buffer member 52 is elastic, the buffer member 52 needs to be bent into an arc shape towards the electrode assembly 30 to connect with it. In this way, the electrode assembly 30 can also support the shielding member 51, allowing the shielding member 51 to elastically abut against the end cap 41 to better cover the injection hole 411 and elastically buffer the added electrolyte, improving the ability to absorb electrolyte impact. The opposite ends of the shielding member 51 refer to the opposite ends of the shielding member 51 along its length direction, and also to the opposite ends of the shielding member 51 along the width direction of the end cap 41.

[0114] Understandably, when the electrode assembly 30 is configured as one, the buffer members 52 at the opposite ends of the shield 51 are bent and connected to the electrode assembly 30.

[0115] In some embodiments, please refer to Figure 3 and Figure 4When the shielding component 50 is a sheet-like structure, it can be an elastic sheet-like structure. That is, the shielding component 50 has elastic properties. This elasticity allows the shielding member 51 to elastically support the end cap 41 after assembly, specifically to elastically cover the injection hole 411. During electrolyte injection, the shielding member 51 can elastically buffer the electrolyte, better absorbing the impact energy of the electrolyte, thus buffering and dispersing it, preventing the electrolyte from directly washing over the electrode assembly 30, and consequently preventing the diaphragm from folding due to electrolyte washing. Because the shielding component 50 can elastically deform, this also facilitates electrolyte injection, improving the injection efficiency. Furthermore, this structure protects the shielding member 51, preventing it from detaching from the end cap 41. Understandably, the shielding component 50 can also use a flexible diaphragm. The flexible diaphragm is attached to the end cap 41. When electrolyte is added, only a part of the area where the shielding component 50 is attached to the end cap 41 will be washed away by the electrolyte. This will not cause the shielding component 50 to fall off. Moreover, the shielding component 50 can also buffer and disperse the added electrolyte to prevent the electrolyte from directly washing the electrode component 30.

[0116] In some embodiments, please refer to Figure 4 , Figure 5 and Figure 6 The shielding assembly 50 includes a shielding member 51 and a buffer member 52. When the shielding assembly 50 is in the form of a sheet, its length is L, which is the sum of the lengths of the shielding member 51 and the buffer members 52 at both ends, and satisfies: 2mm ≤ L1 + 1.5 * HL ≤ 6mm. Here, L1 is the distance between the two sets of electrode assemblies 30 when unfolded (i.e., the distance between the two sets of electrode assemblies 30 when they are unfolded relative to each other, parallel to the side of the end cap 41, and at the same height), and H is the thickness of the electrode assembly 30. This length specification of the shielding assembly 50 ensures that both ends of the shielding assembly 50 can be connected to the two electrode assemblies 30 adjacent to the injection hole 411, and that both ends of the shielding assembly 50 do not exceed the side of the corresponding electrode assembly 30. This prevents interference caused by the two ends of the shielding assembly 50 abutting each other after the two sets of electrode assemblies 30 are joined together. For the same type of battery cell, the values ​​of L1 and H are relatively fixed. Understandably, the value of L1 can be different or the same for different models of battery cells, and this is not limited here. Similarly, the value of H can be different or the same for different models of electrode assemblies 30, and this is not limited here. When the length L of the shielding assembly 50 is too large, after assembly, the two ends of the shielding assembly 50 may abut against each other and cause interference, which is not convenient for electrolyte injection and mitigation of electrolyte impact. When the length L of the shielding assembly 50 is too small, after assembly, it is difficult to ensure that the two ends of the shielding assembly 50 are connected to the electrode assembly 30, which is not convenient for mitigating electrolyte impact.

[0117] In one embodiment, L1 ranges from 30mm to 100mm, such as 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 70mm, 65mm, 70mm, 75mm, 80mm, 85mm, 90mm, 95mm, 100mm, etc., to ensure that the gap between the two sets of electrode assemblies 30 is not too small when unfolded, facilitating assembly. If L1 is less than 30mm, the gap between the two sets of electrode assemblies 30 will be too small when unfolded, making assembly inconvenient. Conversely, if the gap between the two sets of electrode assemblies 30 is too large when unfolded, such as L1 being greater than 100mm, the shielding component 50 will be too long, which is also not conducive to the connection of the tabs 31.

[0118] In one embodiment, the thickness H of the electrode assembly 30 ranges from 10mm to 30mm, such as H being 10mm, 12mm, 15mm, 18mm, 20mm, 22mm, 25mm, 28mm, 30mm, etc., to ensure that the thickness of a single electrode assembly 30 is appropriate. If the thickness of the electrode assembly 30 is too small, such as H being less than 10mm, the electrode assembly 30 is too thin, has low structural strength, and is inconvenient to process and manufacture. On the other hand, if the thickness of the electrode assembly 30 is too large, such as H being greater than 30mm, the electrode assembly is too thick, which will make it loose during processing and is also not conducive to heat dissipation.

[0119] In one example, the shielding component 50 can be 100mm long, the spacing L1 between the two sets of electrode components 30 when unfolded is 80mm, and the thickness of the electrode component 30 is 17mm. In another example, the shielding component 50 can be 76mm long, the spacing L1 between the two sets of electrode components 30 when unfolded is 52mm, and the thickness of the electrode component 30 is 20mm.

[0120] In some embodiments, please refer to Figure 3 and Figure 4, since the shielding component 50 covers the liquid injection hole 411, the first side 511 and the second side 512 of the shielding component 50 are respectively located on opposite sides of the liquid injection hole 411, and the distance between the first side 511 of the shielding component 50 and the liquid injection hole 411 is less than or equal to the distance between the second side 512 of the shielding component 50 and the liquid injection hole 411. The distance between the first side 511 of the shielding component 50 and the liquid injection hole 411 is d, and 0 < d < 20 mm. The distance between the first side 511 of the shielding component 50 and the liquid injection hole 411 is d. That is to say, the shielding component 50 covers the liquid injection hole 411, and the first side 511 of the shielding component 50 exceeds the edge of the liquid injection hole 411. The minimum distance by which the first side 511 of the shielding component 50 exceeds the edge of the liquid injection hole 411 is the interference distance. The range of the distance d by which the first side 511 of the shielding component 50 exceeds the edge of the liquid injection hole 411 is taken as 0 < d < 20 mm. For example, the distance d can be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, etc. Thus, when injecting the electrolyte, the electrolyte flushes open the first side 511 of the shielding component 50, which requires a certain amount of force, ensuring the buffering ability of the shielding component 50 for the electrolyte, so as to better disperse the electrolyte and avoid the electrolyte directly flushing the electrode component 30. When the distance d is too small, such as when d is less than or equal to 0, it is difficult to ensure that the shielding component 50 completely covers the liquid injection hole 411. When injecting the electrolyte, the electrolyte will rush out from the first side 511 of the shielding component 50 and flush the electrode component 30. When the distance d is too large, such as when it is greater than 20 mm, the force required for the electrolyte to flush open the shielding component 50 and flow out from the first side 511 of the shielding component 50 is too large, resulting in a decrease in the electrolyte injection efficiency. Making the distance between the first side 511 of the shielding component 50 and the liquid injection hole 411 less than or equal to the distance between the second side 512 of the shielding component 50 and the liquid injection hole 411 makes it require a greater force for the electrolyte to flush open the second side 512 of the shielding component 50, which can better protect the tab 31 adjacent to the second side 512.

[0121] In the above embodiment, when the shielding component 50 includes the shielding member 51, the first side 511 of the shielding component 50 is the first side of the shielding member 51, and the second side 512 of the shielding component 50 is the second side of the shielding member 51.

[0122] In some embodiments, please refer to Figure 4 and Figure 6The second side of the shielding component 50 is attached to the adjacent tab 31, and the first side 511 of the shielding component 50 is spaced apart from the other tab. That is, the second side 512 of the shielding component 50 is attached to the tab 31 adjacent to the second side 512, i.e., the second side 512 of the shielding component 50 is attached to the second tab 312. Attaching the second side 512 of the shielding component 50 to the second tab 312 makes it easier for the injected electrolyte to push aside the shielding component 50. The resistance from the second side 512 of the shielding component 50 to the second tab 312 is greater, which reduces the impact force of the electrolyte on the second tab 312. Consequently, when the electrolyte reaches the second tab 312 and flows along the second tab 312 to the electrode assembly 30, the impact force of the electrolyte is very small, thus better preventing the electrolyte from eroding and folding the diaphragm.

[0123] In some embodiments, the shielding component 50 covers the tab 31 adjacent to the second side 512 of the shielding component 50. That is, the shielding component 50 covers the second tab 312, which not only protects the second tab 312, but also prevents the connection between the second tab 312 and the second electrode terminal 422 from affecting the electrode assembly 30. For example, the weld joint between the second tab 312 and the second electrode terminal 422 often has burrs and weld slag. By covering the second tab 312 with the shielding component 50, the shielding component 50 can cover these burrs and weld slag, preventing them from damaging the electrode assembly 30 and improving safety.

[0124] In the above embodiment, the width of the shielding component 50 is D, and satisfies: D = D1 + D2 + d + D3, where D1 is the width of the tab 31 covered by the shielding component 50, that is, D1 is the width of the second tab 312, D2 is the diameter of the injection hole 411, and D3 is the distance between the tab 31 adjacent to the shielding component 50 and the injection hole 411. Figure 4 D3 represents the minimum distance between the second tab 312 and the edge of the liquid injection hole 411. Generally, the distance between the second tab 312 and the liquid injection hole 411 may be different for different models of battery cells 200. For the same model of battery cell 200, the distance between the second tab 312 and the liquid injection hole 411 is relatively fixed. The distance between the second tab 312 and the liquid injection hole 411 on a conventional battery cell 200 is in the range of 3-5mm. d represents the distance between the first side 511 of the aforementioned shielding component 50 and the liquid injection hole 411. Using the shielding component 50 of this width ensures that the shielding component 50 covers the injection hole 411 well, and maintains the distance between the first side 511 of the shielding component 50 and the injection hole 411 to better buffer the injected electrolyte. Moreover, the resistance to the electrolyte flowing out from the second side 512 of the shielding component 50 is greater, so that only a small amount of electrolyte flows to the second tab 312, thus protecting the second tab 312 and the electrode assembly 30.

[0125] After the electrode assembly 30 is manufactured and before it is compacted, the electrode sheet and the diaphragm are in a relatively free state, and the electrode assembly 30 is in a loose state. In particular, an opening may occur between the innermost electrode sheet and the diaphragm in the wound electrode assembly 30. If the electrode assembly 30 is improperly transferred in this state, it is easy for the electrode sheet to slip and the diaphragm to fold.

[0126] In some embodiments, please refer to Figure 4 , Figure 5 and Figure 6 The battery cell 200 also includes insulating tape 61. At least one layer of insulating tape 61 is adhered to the second end 302 of each electrode assembly 30, with both ends of the insulating tape 61 attached to opposite sides of the corresponding electrode assembly 30. That is, both ends of the insulating tape 61 are attached to opposite sides of the corresponding electrode assembly 30. When an electrode assembly includes one electrode assembly 30, the insulating tape 61 is attached to the opposite sides of that electrode assembly 30. When an electrode assembly includes multiple electrode assemblies 30, these electrode assemblies 30 are stacked, and the insulating tape 61 is adhered to the end faces of the second ends 302 of all the electrode assemblies 30 in the stacked electrode assembly, with both ends of the insulating tape 61 attached to the two outermost sides of the stacked electrode assembly.

[0127] Insulating tape 61 refers to tape with insulating properties. For example, insulating tape 61 can be resin tape or other plastic tape. Insulating tape 61 has a length direction and a width direction. The two ends of the insulating tape 61 along its length direction are the two ends of the insulating tape 61, the two sides of the insulating tape 61 along its length direction are the two sides of the insulating tape 61, and one edge of the insulating tape 61 along its length direction is the side edge of the insulating tape 61.

[0128] At least one layer of insulating tape 61 is attached to the second end 302 of each group of electrode assemblies 30. The second end 302 of each group of electrode assemblies 30 can be bound with insulating tape 61. This not only binds the diaphragm of each group of electrode assemblies 30 between the corresponding electrode plates to better prevent the diaphragm from folding, but also makes it easier to fold the two groups of electrode assemblies 30 together for easy assembly.

[0129] In some embodiments, an insulating tape 61 is attached to the second end 302 of each group of electrode assemblies 30 for easy installation. Understandably, two, three, or other equal amounts of insulating tape 61 may be attached to the second end 302 of each group of electrode assemblies 30.

[0130] In some embodiments, please refer to Figure 4 , Figure 5 and Figure 6The length of the insulating tape 61 attached to the side of the corresponding electrode assembly 30 is greater than 3mm. If the length of the insulating tape 61 attached to the side of the corresponding electrode assembly 30 is M1, the overall thickness of a group of electrode assemblies 30 is M2, and the length of the insulating tape 61 is M, then M = M2 + 2 * M1, where M1 > 3mm. This ensures the adhesion strength between the end of the insulating tape 61 and the electrode assembly 30, better securing the second end 302 of the electrode assembly 30. For example, if the thickness of one electrode assembly 30 is H, and a group of electrode assemblies includes only one electrode assembly 30, then M2 = H. If the thickness of one electrode assembly 30 is H, and a group of electrode assemblies includes only P electrode assemblies 30, then M2 = P * H.

[0131] In some embodiments, when each group of electrode assemblies includes only one electrode assembly 30, the corresponding insulating tape 61 is attached to the second end 302 of the electrode assembly 30, and the two ends of the insulating tape 61 are attached to the opposite sides of the electrode assembly 30. Then the thickness M2 of the group of electrode assemblies 30 is the thickness of the electrode assembly 30.

[0132] In some embodiments, please refer to Figure 4 , Figure 5 and Figure 6 The width N of each insulating tape 61 is less than 50mm. This makes it easy to apply the insulating tape 61 and to control the width of the insulating tape 61 covering the electrode assembly 30.

[0133] In some embodiments, please refer to Figure 4 The battery cell 200 also includes two adapter pieces 43, each corresponding to one of the two electrode terminals 42. Each adapter piece 43 is connected to its corresponding electrode terminal 42 and also to its corresponding tab 31. In other words, each tab 31 is connected to its corresponding electrode terminal 42 via the adapter piece 43, facilitating a more secure connection between the tab 31 and the electrode terminal 42. For clarity, the adapter piece 43 connected to the first electrode terminal 421 is referred to as the first adapter piece 431, and the first tab 311 is connected to the first adapter piece 431; the adapter piece 43 connected to the second electrode terminal 422 is referred to as the second adapter piece 432, and the second tab 312 is connected to the second adapter piece 432.

[0134] Please see Figure 7 , Figure 7This is a side view of the battery cell 200 after assembly according to some embodiments of this application. In these embodiments, a flow guide groove 412 is provided on the side of the end cap 41 facing the shielding assembly 50. One end of the flow guide groove 412 communicates with the liquid injection hole 411, and the shielding assembly 50 covers at least a portion of the flow guide groove 412. The flow guide groove 412 is a groove provided on the side of the end cap 41 where the shielding assembly 50 is located. One end of the flow channel 412 is connected to the injection hole 411. The shielding component 50 covers part of the flow channel 412 to form a channel. When injecting electrolyte, the shielding component 50 buffers the electrolyte, and the electrolyte can flow into the flow channel 412. The flow channel 412 guides and disperses the electrolyte to the set position, which facilitates the addition of electrolyte and improves the addition efficiency of electrolyte. In addition, since the shielding component 50 withstands the impact of the electrolyte being added at the injection hole 411 and absorbs the impact energy of the electrolyte at the injection hole 411, it buffers the electrolyte, so that the impact force of the electrolyte flowing out of the flow channel 412 is very small, thereby avoiding the electrolyte from washing the electrode assembly 30 and causing the diaphragm to fold.

[0135] In the above embodiments, when the shielding assembly 50 includes a shielding member 51, the guide groove 412 is disposed on the shielding member 51.

[0136] Please see Figure 8 , Figure 8 This is a schematic diagram of the structure of a battery cell 200 before it is assembled according to some embodiments of this application. In these embodiments, the flow channel 412 includes a first flow channel 4121, one end of which is connected to the liquid injection hole 411, and the other end of which extends out of the shielding assembly 51 away from the side of the adjacent tab 31. That is, the other end of the first flow channel 4121 extends out of the shielding assembly 51 away from the side of the adjacent second tab 312, i.e., the other end of the first flow channel 4121 extends from the second side 512 of the shielding assembly 51. By setting the first guide groove 4121, when injecting electrolyte, more electrolyte can be guided to flow out from the side where the second side 512 of the shielding component 51 is located, so as to add electrolyte. This avoids the situation where the impact force of the electrolyte breaks through the area between the shielding component 51 and the end cap 41 between the injection hole 411 and the second electrode 312 when the electrolyte is added. At this time, the impact force is relatively large and will cause a large impact on the second electrode 312. By setting the first guide groove 4121, the force of the electrolyte breaking through the shielding component 51 between the injection hole 411 and the second electrode 312 is smaller, thereby reducing the impact on the second electrode 312 and reducing its influence.

[0137] In the above embodiments, when the shielding assembly 50 includes a shielding member 51, the first guide groove 4121 is disposed on the shielding member 51.

[0138] In some embodiments, there may be one first guide channel 4121. Of course, there may also be multiple first guide channels 4121, which is not limited here.

[0139] Please see Figure 9 , Figure 9 This is a schematic diagram of the structure of a battery cell 200 before it is assembled according to some embodiments of this application. In these embodiments, the flow channel 412 includes a second flow channel 4122, one end of which is connected to the injection hole 411, and the other end of which is adjacent to the side of the end cap 41. By providing the second flow channel 4122, when electrolyte is injected, the electrolyte can be guided to flow to the side adjacent to the end cap 41, and then the shielding component 50 between the other end of the second flow channel 4122 and the corresponding side of the end cap 41 can be opened to further absorb the impact energy of the electrolyte, reduce the impact force of the electrolyte, disperse the electrolyte, facilitate the addition of electrolyte, and also facilitate the electrode assembly 30 to absorb the electrolyte more evenly.

[0140] In the above embodiments, when the shielding assembly 50 includes a shielding member 51, the second guide groove 4122 is disposed on the shielding member 51.

[0141] In some embodiments, one end of the second guide channel 4122 is connected to the injection hole 411, and the other end of the second guide channel 4122 extends to the side of the end cap 41. In this way, when injecting electrolyte, the electrolyte can be guided to flow to the side of the end cap 41 to disperse the electrolyte, which facilitates the addition of electrolyte and also makes it easier for the electrode assembly 30 to absorb electrolyte more evenly.

[0142] In some embodiments, please refer again Figure 7 The flow channel 412 includes a third flow channel 4123. One end of the third flow channel 4123 is connected to the injection hole 411, and the other end of the third flow channel 4123 extends to the tab 31 of the adjacent shielding assembly 50. That is, the first side 511 of the shielding assembly 50 is spaced apart from the first tab 311, and when the second side 511 of the shielding assembly 50 is attached to the second tab 312, the other end of the third flow channel 4123 extends to the second tab 312. By providing the third flow channel 4123, when electrolyte is injected, the electrolyte can be guided to flow to the second tab 312 to disperse the electrolyte, which facilitates the addition of electrolyte and also makes it easier for the electrode assembly 30 to absorb electrolyte more evenly.

[0143] In the above embodiments, when the shielding assembly 50 includes the shielding member 51, the third guide groove 4123 is disposed on the shielding member 51. The first side 511 of the shielding assembly 50 is the first side of the shielding member 51, and the second side 512 of the shielding assembly 50 is the second side of the shielding member 51.

[0144] In some embodiments, please refer to Figure 9The end cap 41 can be simultaneously provided with a first guide groove 4121, a second guide groove 4122, and a third guide groove 4123 to better disperse the electrolyte and improve the electrolyte filling efficiency. Understandably, the end cap 41 can be provided with only one or two of the first guide groove 4121, the second guide groove 4122, and the third guide groove 4123.

[0145] Please see Figure 10 , Figure 10 This is a schematic diagram of the structure of a battery cell 200 before it is assembled according to some embodiments of this application. In these embodiments, the second side 512 of the shielding assembly 50 is spaced apart from the second tab 312. This structure allows for the use of a narrower shielding assembly 50, and during electrolyte filling, after the shielding assembly 50 absorbs the impact force of the electrolyte at the injection hole 411, more electrolyte flows out from the opposite sides of the shielding assembly 50.

[0146] Please see Figure 11 , Figure 11 This is a schematic diagram of the structure of a battery cell 200 before assembly according to some embodiments of this application. In these embodiments, the connection area between each tab 31 and the corresponding adapter piece 43 is covered with an insulating sheet 45. Covering the connection area between the tab 31 and the adapter piece 43 with an insulating sheet 45 can protect the connection between the tab 31 and the adapter piece 43 and prevent the connection between the tab 31 and the adapter piece 43 from affecting the electrode assembly 30, thereby improving the safety of manufacturing the battery 1001. For example, there may be burrs and weld slag in the welding area between the tab 31 and the adapter piece 43. Covering this area with an insulating sheet 45 can prevent the burrs and weld slag in the welding area between the tab 31 and the adapter piece 43 from damaging the electrode assembly 30, thereby improving safety.

[0147] Insulating sheet 45 refers to a film with insulating properties, such as a resin film or other plastic film.

[0148] In some embodiments, when the shielding component 50 covers the second tab 312, the shielding component 50 is attached to the insulating sheet 45 corresponding to the second tab 312, so that the second tab 312 can be better protected by the insulating sheet 45.

[0149] Please see Figure 12 , Figure 12 This is a schematic diagram of the structure of a battery cell 200 before it is assembled according to some embodiments of this application. In these embodiments, the end cap assembly 40 further includes a spacer 44, on which the end cap 41 is mounted. The spacer 44 supports the end cap 41, and can also be used to isolate electrical connection components within the housing 70 from the end cap 41 to reduce the risk of short circuits. Exemplarily, the spacer 44 can be made of plastic, rubber, etc.

[0150] The width direction of the spacer 44 is consistent with the width direction of the end cap 41, and the length direction of the spacer 44 is consistent with the length direction of the end cap 41. The two ends of the length direction of the spacer 44 are the two ends of the spacer 44.

[0151] In some embodiments, generally, the spacer 44 supports the edge of the end cap 41, and the spacer 41 tends to protrude from the side of the end cap 41 facing the electrode assembly 30. The shielding assembly 50 is spaced apart from the spacer 44 so that when the electrode assembly 30 is assembled, the spacer 44 will not push against the shielding assembly 50, so that the shielding assembly 50 can fit well on the end cap 41.

[0152] In some embodiments, the distance K between the side of the shielding component 50 and the end of the isolator 44 near the shielding component 50 is greater than 3 mm. This ensures that the isolator 44 will not push against the shielding component 50 during the installation of the electrode assembly 30, and that the shielding component 50 is well attached to the end cap 41.

[0153] Please see Figure 13 , Figure 13 This is a schematic diagram of the structure of a battery cell 200 before assembly in some embodiments of this application. In these embodiments, two layers of insulating tape 61 can be adhered to the second end 302 of each electrode assembly 30. The two layers of insulating tape 61 provide a more stable hold to the second end 302 of the electrode assembly 30, securing the separator between the electrodes and better preventing separator folding. It can be understood that three, four, or other layers of insulating tape 61 can be adhered to the second end 302 of each electrode assembly 30.

[0154] In some embodiments, the sum of the widths of the insulating tapes 61 on each electrode assembly 30 is less than the width of the electrode assembly 30. Setting the sum of the widths of the insulating tapes 61 to be less than the width of the electrode assembly 30 ensures that the insulating tapes 61 do not completely cover the second end 302 of the electrode assembly 30, allowing electrolyte to enter the electrode assembly 30 in the area outside the insulating tapes 61, so that the electrode assembly 30 can absorb the electrolyte.

[0155] Please see Figure 14 , Figure 14 This is a schematic diagram of the structure of the electrode assembly 30 in a battery cell 200 according to some embodiments of this application. The figure shows an insulating tape 61 covering the area of ​​the end face of the second end 302 of the electrode assembly 30. In these embodiments, the insulating tape 61 has multiple openings 611 corresponding to the area of ​​the end face of the second end 302 of the electrode assembly 30. The openings 611 facilitate the entry of electrolyte into the electrode assembly 30 and facilitate the absorption of electrolyte by the electrode assembly 30.

[0156] In some embodiments, the insulating tape 61 covers a portion of the end face of the second end 302 of the electrode assembly 30. This allows electrolyte to enter the electrode assembly 30 in the area of ​​the second end 302 outside the insulating tape 61, and the opening 611 also allows electrolyte to enter the electrode assembly 30, facilitating the absorption of electrolyte by the electrode assembly 30.

[0157] Please see Figure 15 , Figure 15 This is a schematic diagram of the structure of the electrode assembly 30 in a battery cell 200 according to some embodiments of this application. In these embodiments, an insulating tape 61 covers the second end 302 of the electrode assembly 30. The insulating tape 61 has a plurality of openings 611 in the area corresponding to the end face of the second end 302 of the electrode assembly 30. This can better and more stably bind the second end 302 of the electrode assembly 30 and bind the separator between the electrodes to better prevent the separator from folding.

[0158] In some embodiments, the insulating tape 61 has openings 611 in only a portion of the area corresponding to the end face of the second end 302 of the electrode assembly 30, in order to ensure good structural strength of the insulating tape 61 and to more stably bind the second end 302 of the electrode assembly 30.

[0159] Please see Figure 16 , Figure 16 This is a schematic diagram of the structure of the electrode assembly 30 in a battery cell 200 according to some embodiments of this application. In these embodiments, the entire area of ​​the insulating tape 61 corresponding to the end face of the second end 302 of the electrode assembly 30 is provided with openings 611 to improve the ability of electrolyte to enter the electrode assembly 30 and facilitate the absorption of electrolyte by the electrode assembly 30.

[0160] Please see Figure 17 , Figure 17 This is a side view of the battery cell 200 after assembly according to some embodiments of this application. In these embodiments, the battery cell 200 may include multiple electrode assemblies 30. These electrode assemblies 30 are divided into two groups. When each group of electrode assemblies includes multiple electrode assemblies 30, these electrode assemblies 30 are stacked. Insulating tape 61 is adhered to the end faces of the second ends 302 of multiple electrode assemblies 30 in the group of electrode assemblies, and the two ends of the insulating tape 61 are attached to the two outermost sides of the corresponding stacked electrode assemblies. This structure can bind the second ends 302 of each group of electrode assemblies, facilitate the integration of each group of electrode assemblies, and also facilitate the folding and assembly of the two groups of electrode assemblies.

[0161] In the above embodiments, each group of electrode assemblies includes two electrode assemblies 30. It can be understood that each group of electrode assemblies may include three, four or other numbers of electrode assemblies 30, which is not limited here.

[0162] Understandably, in some embodiments, when each group of electrode assemblies includes multiple electrode assemblies 30, insulating tape 61 can be individually attached to each electrode assembly 30 to bind the second end 302 of each electrode assembly 30 with insulating tape 61, so as to prevent the diaphragm in the second end 302 of the electrode assembly 30 from folding when the electrode assembly 30 is moved.

[0163] Please see Figure 18 , Figure 18 This is a side view of a battery cell 200 according to some embodiments of this application. In these embodiments, the battery cell 200 includes only one electrode assembly 30. Alternatively, when there are multiple electrode assemblies 30, they can be stacked to form a whole, thus being regarded as a single electrode assembly 30. When an electrode assembly 30 is provided, a shielding assembly 50 covers the liquid injection hole 411 of the end cap 41, and both ends of the shielding assembly 50 are connected to the two sides of the end face of the first end 301 of the electrode assembly 30. In this way, when electrolyte is added, the shielding assembly 50 can also buffer and disperse the added electrolyte, preventing the electrolyte from directly washing over the electrode assembly 30, thereby preventing the separator from folding due to electrolyte impact.

[0164] In the above embodiments, the shielding component 50 includes a shielding member 51 and a buffer member 52. When the shielding component 50 is a sheet-like structure, the shielding member 51 covers the liquid injection hole 411 of the end cap 41, and the two ends of the shielding member 51 are bent and connected to the two sides of the end face of the first end 301 of the electrode component 30 by the two buffer members 52.

[0165] In some embodiments, when the battery cell 200 includes only one electrode assembly 30, at least one insulating tape 61 may be attached to the second end 302 of the electrode assembly 30, and the two ends of the insulating tape 61 may be attached to the opposite sides of the electrode assembly 30, so as to bind the second end 302 of the electrode assembly 30 by the insulating tape 61 and prevent the diaphragm in the second end 302 of the electrode assembly 30 from folding.

[0166] According to some embodiments of this application, this application also provides a battery, including the battery cell described in any of the above embodiments.

[0167] According to some embodiments of this application, this application also provides an electrical device including the battery described in any of the above embodiments.

[0168] The electrical device can be any of the aforementioned battery-powered equipment or systems.

[0169] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not 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. These 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, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: Electrode assembly; An end cap assembly includes an end cap, wherein the end cap has an injection hole; as well as, A shielding component is disposed on the side of the end cap facing the electrode assembly and covers the injection hole; The shielding component is bonded to the end cap so that the shielding component completely covers the injection hole; the bonding strength between the shielding component and the end cap is less than the pressure of the electrolyte injected into the injection hole, so that the electrolyte injected into the injection hole can partially impact and detach the shielding component from the end cap. When electrolyte is injected from the injection hole, the electrolyte directly impacts the shielding component, causing the shielding component to withstand the impact force of the injected electrolyte and to disperse and buffer the injected electrolyte. The shielding assembly includes a shielding member that covers the injection hole and a buffer member that supports the shielding member, the buffer member being connected to the electrode assembly.

2. The battery cell as described in claim 1, characterized in that: The buffer is elastic.

3. The battery cell as described in claim 1, characterized in that: The shielding component has a sheet-like structure.

4. The battery cell as described in claim 3, characterized in that: The shielding element is elastic.

5. The battery cell according to any one of claims 1-4, characterized in that: The shielding member is provided with buffer members at opposite ends along the width direction of the end cap, and the buffer members are sheet-like structures integrally formed with the shielding member.

6. The battery cell as described in claim 5, characterized in that: The buffer element is bent and connected to the electrode assembly.

7. The battery cell as described in claim 5, characterized in that: The battery cell includes multiple electrode assemblies, which are divided into two groups. The buffer is bent and connected to two electrode assemblies adjacent to the injection hole.

8. The battery cell as described in claim 7, characterized in that: The length of the shielding component is L, and satisfies: 2mm≤L1+1.5*HL≤6mm, where L1 is the distance between the two sets of electrode components when they are unfolded at the same height and parallel to the side of the end cap, and H is the thickness of the electrode component.

9. The battery cell according to any one of claims 1-4 and 6-8, characterized in that: The shielding assembly has a first side and a second side opposite to each other along the length of the end cap. The first side and the second side are located on opposite sides of the injection hole. The distance from the first side to the injection hole is less than or equal to the distance from the second side to the injection hole. The distance between the first side and the injection hole is d, and 0. <d<20mm。 10. The battery cell as described in claim 9, characterized in that: The electrode assembly has tabs with opposite polarities. The second side of the shielding assembly is attached to the adjacent tab, and the first side of the shielding assembly is spaced apart from the other tab.

11. The battery cell according to any one of claims 1-4, 6-8, and 10, characterized in that: The end cap has a flow guide groove on the side facing the shielding component, one end of the flow guide groove is connected to the injection hole, and the shielding component covers at least a portion of the flow guide groove.

12. The battery cell as described in claim 11, characterized in that: The flow guide includes a first flow guide, one end of which is connected to the injection hole, and the other end of which extends out of the shielding assembly along the length of the end cap.

13. The battery cell as described in claim 11, characterized in that: The flow guide groove includes a second flow guide groove, one end of which is connected to the injection hole, and the other end of which is adjacent to the side of the end cap in the width direction, or the other end of which extends to the side of the end cap in the width direction.

14. The battery cell according to any one of claims 1-4, 6-8, and 12-13, characterized in that: The electrode assembly has tabs with opposite polarities. The end cap assembly also includes electrode terminals that are respectively connected to the tabs with opposite polarities. The electrode terminals are mounted on the end cap. The battery cell also includes adapter pieces that are respectively connected to each of the electrode terminals. Each adapter piece is connected to the corresponding tab. The connection area between each tab and the corresponding adapter piece is covered with an insulating sheet.

15. The battery cell according to any one of claims 1-4, 6-8, and 12-13, characterized in that: The end cap assembly also includes an isolation member that supports the end cap, and the shielding assembly is spaced apart from the isolation member.

16. The battery cell as described in claim 15, characterized in that: The distance between the side of the shielding component and the end of the isolator near the shielding component is greater than 3 mm.

17. A battery, characterized in that: Includes the battery cell as described in any one of claims 1-16.

18. An electrical appliance, characterized in that: Includes the battery as described in claim 17.

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