Battery cell, battery and electric device

Abstract

A battery cell (100), comprising a casing (4); an electrode post (5); and a core (2), the core (2) being arranged in the casing (4); and an electrode assembly (1), the electrode assembly (1) being configured to connect the electrode post (5) and the core (2), wherein the electrode assembly (1) comprises a tab (10), the tab (10) being provided with a first connection portion (11) at one end and a second connection portion (12) at the other end, the first connection portion (11) being configured to be coupled to the core (2), and the second connection portion (12) being configured to be coupled to the electrode post (5). A fusing portion (13) is formed on the tab (10), and the fusing portion (13) is arranged between the first connection portion (11) and the second connection portion (12). The present application further relates to a battery and an electric device.

Description

Battery cells, batteries and electrical devices Technical Field

[0001] The present application relates to the field of batteries, and in particular to battery cells, batteries and electrical devices. Background Art

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

[0003] The current design width and thickness of the battery cell's tabs are basically the same. When used as a fuse, there is no weak area and the melting position is uncertain. If the middle part is melted, the subsequent impact may be small. If the root of the tab is melted, some parts of the electrode may be burned at the same time, causing the battery cell to fail. If the melting is close to the weld mark area, the weld mark may be melted at the same time.

[0004] Utility Model Content

[0005] In view of the above problems, the present application provides a battery cell, a battery and an electrical device, which can cause the electrode assembly's tabs to fuse directionally when a short circuit occurs outside the battery cell connected to the electrode assembly, thereby terminating the short circuit, avoiding thermal runaway of the battery cell, protecting the battery cell, and improving the safety of the battery.

[0006] In order to solve the above technical problems, the embodiments of the present application provide the following technical solutions:

[0007] In the first aspect, the present application provides a battery cell, which includes: a shell; a pole; a battery cell, the battery cell being arranged in the shell; and an electrode assembly, the electrode assembly being configured to connect the pole and the battery cell, the electrode assembly including a tab, the tab having a first connection portion at one end and a second connection portion at the other end, the first connection portion being configured to be connected to the battery cell, and the second connection portion being configured to be connected to the pole; wherein a fuse portion is formed on the tab, the fuse portion being arranged between the first connection portion and the second connection portion.

[0008] A fuse is provided on the tab, so that the tab itself has a fuse effect. In the absence of an adapter, the electrode assembly can also be disconnected in abnormal situations such as short circuits. The fuse has a small flow area and relatively large resistance, making it an area that is more likely to melt. When a short circuit occurs outside the battery cell connected to the electrode assembly, a large instantaneous current is generated inside the battery cell. When the large current passes through the fuse, the fuse melts and terminates the short circuit process, preventing the battery cell from thermal runaway and playing a role in protecting the battery cell.

[0009] In some embodiments of the battery cell, a distance between the fuse portion and the first connection portion is in a range from 20% to 80% of a distance between the first connection portion and the second connection portion.

[0010] In some embodiments of the battery cell, a distance between the fuse portion and the first connection portion is in a range of 40% to 50% of a distance between the first connection portion and the second connection portion.

[0011] In some embodiments of the battery cell, a distance between the fuse portion and the second connection portion is in a range from 20% to 80% of a distance between the first connection portion and the second connection portion.

[0012] In some embodiments of the battery cell, a distance between the fuse portion and the second connection portion is in a range from 50% to 60% of a distance between the first connection portion and the second connection portion.

[0013] In some embodiments of the battery cell, the flow area of ​​the fuse portion is smaller than the flow area of ​​the rest of the tab, and the flow area of ​​the fuse portion is smaller than two-thirds of the flow area of ​​the first connection portion and / or smaller than two-thirds of the flow area of ​​the second connection portion.

[0014] In some embodiments of the battery cell, the width of the fuse portion is smaller than the width of the remaining portion of the tab, and the width of the fuse portion is smaller than 80% of the average width of the tab.

[0015] In some embodiments of the battery cell, the tab is provided with a missing portion adjacent to the fuse portion along the width direction and / or the thickness direction.

[0016] In some embodiments of the battery cell, the missing portion is in the form of a rectangular groove, a circular groove, and / or a triangular groove.

[0017] In some embodiments of the battery cell, the fuse portion is covered with an insulating layer.

[0018] In some embodiments of the battery cell, the insulating layer includes a first insulating layer and a second insulating layer, the first insulating layer is disposed on a first surface of the fuse part, and the second insulating layer is disposed on a second surface of the fuse part opposite to the first surface.

[0019] In some embodiments of the battery cell, the electrode assembly further includes a transition piece coupled to the second connection portion of the tab.

[0020] In a second aspect, the present application provides a battery comprising the battery cell in the above embodiment.

[0021] In a third aspect, the present application provides an electrical device, which includes the battery in the above embodiment, and the battery is used to provide electrical energy.

[0022] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0024] FIG1 is an exploded schematic diagram of a battery cell according to some embodiments of the present application;

[0025] FIG2 is a cross-sectional view of a battery cell according to some embodiments of the present application;

[0026] FIG3 is an enlarged schematic diagram of portion A in FIG2 ;

[0027] FIG4 is a schematic diagram of a tab of an electrode assembly according to some embodiments of the present application;

[0028] FIG5 is a schematic diagram of a tab of an electrode assembly according to some embodiments of the present application;

[0029] FIG6 is a schematic diagram of a tab of an electrode assembly according to some embodiments of the present application;

[0030] FIG7 is a schematic diagram of an electrode tab of an electrode assembly according to some embodiments of the present application; and

[0031] FIG8 is a schematic diagram of a tab of an electrode assembly according to some embodiments of the present application;

[0032] The accompanying drawings in the specific implementation manner are as follows:

[0033] 100 battery cells;

[0034] 1. Electrode assembly; 2. Battery cell; 3. Top cover; 4. Casing; 5. Post;

[0035] 10 Tab; 11 First connecting portion; 12 Second connecting portion; 13 Fusing portion; 14 Missing portion; 15 Insulating layer; 151 First insulating layer; 152 Second insulating layer. DETAILED DESCRIPTION

[0036] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0038] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0039] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0040] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0041] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0042] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0043] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0044] Currently, market developments indicate that power batteries are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.

[0045] As the scope and field of power battery applications continue to expand, battery safety issues are receiving more and more widespread attention. During transportation or assembly, batteries are prone to external short circuits. Once an external short circuit occurs, a large current will be generated instantly, causing the battery temperature to rise sharply, which can easily lead to fire and other problems. In severe cases, it may cause significant loss of life and property.

[0046] It's worth noting that in existing power batteries, to maximize internal cell space utilization, many lithium-ion cells eliminate the adapter plate and directly weld the electrode assembly to the top cover pole. Without the adapter plate, it's impossible to set a fuse area on the adapter plate. Consequently, when an external short circuit occurs in the cell, the cell's overcurrent chain lacks a pre-set fuse area, making it impossible to disconnect the chain. This can lead to prolonged high-current discharge throughout the cell, triggering thermal runaway and creating safety issues.

[0047] In order to solve the problem of being unable to cut off the overcurrent chain when an external short circuit occurs in the battery cell without an adapter, the research found that a fuse part can be provided on the electrode assembly. Specifically, a slot is punched out on the electrode assembly, or a missing part with a slot is directly formed on the electrode assembly. The remaining area is the fuse part, so that the overcurrent cross-section of the fuse part is small and the resistance is relatively large, which is an area that is relatively easy to melt. Therefore, when a short circuit occurs outside the battery cell connected to the electrode assembly, a large instantaneous current is generated inside the battery cell. Since the fuse part of the electrode assembly has a small overcurrent cross-section and a relatively large resistance, when the current passes through the fuse part, the fuse part melts and terminates the short circuit process, avoiding thermal runaway of the battery cell and playing a role in protecting the battery cell.

[0048] Based on the above considerations, in order to solve the situation where a short circuit occurs outside the battery cell, which may easily cause safety problems, an electrode assembly was designed after in-depth research. A fuse part is formed on the tab. The flow area of ​​the fuse part is relatively small and the resistance is relatively large, thereby having a fuse effect. When a short circuit occurs outside the battery cell connected to the electrode assembly, the fuse part can melt, terminating the short circuit process, avoiding thermal runaway caused by the external short circuit of the battery cell, and playing a role in protecting the battery cell.

[0049] At the same time, the fuse is designed to be located approximately in the middle of the tab, away from the base of the tab where it connects to the cell, and away from the weld mark where the tab connects to the post. That is, the fuse is away from the cell and post, so that when it blows, it will not affect the cell or the weld mark. For example, if the fuse is away from the cell, the overhang of the negative electrode tab of the cell will not be affected (e.g., burned) when it blows. Furthermore, if the fuse is away from the weld mark, it can prevent the weld mark from melting at the same time when the fuse blows. In this way, the fuse can avoid causing secondary damage when it blows, thereby improving battery safety.

[0050] The electrode assembly disclosed in the embodiments of this application is part of a battery, which can be used in, but is not limited to, electrical devices such as vehicles, ships, or aircraft. A power supply system comprising the electrode assembly, battery cells, and batteries disclosed in this application can be used to construct such an electrical device. This facilitates fusing in the event of an external short circuit in the battery cell, preventing thermal runaway and protecting the cell.

[0051] The present invention provides an electric device that uses a battery as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0052] According to some embodiments of the present application, as shown in Figures 1-8, the battery cell 100 may include a shell 4, a pole 5, a battery cell 2 and an electrode assembly 1, the battery cell 2 may be arranged in the shell 4, the electrode assembly 1 is configured to connect the pole 5 and the battery cell 2, the electrode assembly 1 may include a tab 10, the tab 10 may have a first connection portion 11 at one end and a second connection portion 12 at the other end, the first connection portion 11 is configured to be connected to the battery cell 2, and the second connection portion 12 is configured to be connected to the pole 5; wherein a fuse portion 13 may be formed on the tab 10, and the fuse portion 13 may be arranged between the first connection portion 11 and the second connection portion 12.

[0053] As shown in Figures 1-3, a battery cell 100 according to some embodiments of the present application is shown. The battery cell 100 includes an electrode assembly 1, a battery cell 2, a top cover 3, an outer shell 4 and a pole 5. The outer shell 4 can be a shell with two ends open. The battery cell 2 is accommodated in the outer shell 4. The top cover 3 is used to close the open end of the outer shell 4. The pole 5 can be set on the top cover 3. The electrode assembly 1 is used to connect the battery cell 2 and the pole 5.

[0054] According to some embodiments, as shown in Figures 3-8, the electrode assembly 1 may include a tab 10, which is configured to connect the battery cell 2 and the electrode post 5. One end of the tab 10 can be fixed to the battery cell 2, and the other end can be connected to the electrode post 5. In some embodiments, the tab 10 can be directly welded to the electrode post 5 through a weld stamp area, and in other embodiments, the tab 10 can be indirectly connected to the electrode post 5 through an adapter.

[0055] One end of the tab 10 may have a first connection portion 11, which is configured to be connected to the battery cell 2, for example, fixed to the battery cell 2. The other end of the tab 10 may have a second connection portion 12, which is configured to be welded to the electrode 5 or connected to the electrode 5 via an adapter. In this way, the tab 10 is connected between the battery cell 2 and the electrode 5 via the first connection portion 11 and the second connection portion 12 to achieve current conduction.

[0056] According to some embodiments, as shown in Figures 3-8, a fuse portion 13 may be formed on the tab 10. This fuse portion 13 has a greater resistance than the rest of the tab 10, thus providing a fusing effect. When a short circuit occurs outside the battery cell 2 connected to the electrode assembly 1, a large current is instantaneously generated inside the battery cell 2. In this case, when the current reaches the fuse portion 13, the fuse portion 13 melts, thereby terminating the short circuit process, preventing thermal runaway of the battery cell 2, and protecting the battery cell 2.

[0057] The fuse part 13 can be arranged between the first connection part 11 and the second connection part 12. In this way, when the fuse part 13 melts, the connection between the first connection part 11 and the second connection part 12 is disconnected, and then the current conduction between the battery cell 2 and the pole 5 is disconnected, terminating the short circuit process, avoiding thermal runaway of the battery cell 2, and protecting the battery cell 2.

[0058] According to some embodiments, as shown in Figures 3-8, the fuse 13 can be positioned a certain distance from the first connection portion 11 and a certain distance from the second connection portion 12. The distance between the fuse 13 and the first connection portion 11 allows it to be positioned away from the first connection portion 11 and, consequently, away from the battery cell 2 secured thereto. This prevents the fuse 13 from affecting the battery cell 2 when it blows. For example, when the fuse 13 blows, it will not affect the portion of the battery cell 2 where the negative electrode tab protrudes beyond the positive electrode tab. The distance between the fuse 13 and the second connection portion 12 allows it to be positioned away from the second connection portion 12 and, consequently, away from the weld mark region where the second connection portion 12 is located, as well as away from the terminal 5 connected thereto. This prevents the fuse 13 from affecting the weld mark region when it blows. For example, when the fuse 13 blows, it can prevent the weld mark region from simultaneously blowing.

[0059] A fuse part 13 is provided on the tab 10, so that the tab 10 itself has a fusing effect. In the absence of an adapter, the electrode assembly 1 can also be disconnected in abnormal situations such as short circuits. The flow area of ​​the fuse part 13 is small and the resistance is relatively large, which is an area that is relatively easy to fuse. When a short circuit occurs outside the battery cell 2 connected to the electrode assembly 1, a large instantaneous current is generated inside the battery cell 2. When the large current passes through the fuse part 13, the fuse part 13 melts and terminates the short circuit process, thereby avoiding thermal runaway of the battery cell 2 and protecting the battery cell 2.

[0060] In addition, the fuse part 13 is set at a certain distance from the first connecting part 11 and at a certain distance from the second connecting part 12, so that the fuse part 13 is away from the battery core 2 and the pole 5. When the fuse part 13 melts, it can avoid causing secondary hazards and improve battery safety.

[0061] According to some embodiments of the present application, optionally, the distance between the fuse part 13 and the first connection part 11 may be in a range of 20% to 80% of the distance between the first connection part 11 and the second connection part 12. Further, the distance between the fuse part 13 and the first connection part 11 may be in a range of 40% to 50% of the distance between the first connection part 11 and the second connection part 12.

[0062] As shown in Figures 4-8, schematic diagrams of tabs 10 according to different embodiments are shown. For clarity of description, the X and Y directions are shown in the figures, where the X direction is the left-right direction of the page where Figures 4-8 are located, and is defined as the width direction of the tab 10. The Y direction is the top-bottom direction of the page where Figures 4-8 are located, and is defined as the length direction of the tab 10. Thus, the thickness direction of the tab 10 is a direction perpendicular to the length and width directions of the tab 10, that is, a direction perpendicular to the page where Figures 4-8 are located.

[0063] The distance between the fuse part 13 and the first connection part 11 is the distance between the fuse part 13 and the first connection part 11 along the length direction, and the distance between the first connection part 11 and the second connection part 12 is the distance between the first connection part 11 and the second connection part 12 along the length direction.

[0064] According to some embodiments, the distance between the fuse portion 13 and the first connection portion 11 can be in the range of 20% to 80% of the distance between the first connection portion 11 and the second connection portion 12, or in the range of 30% to 70%, or in the range of 40% to 60%, or in the range of 40% to 50%.

[0065] By defining the relationship between the distance between the fuse portion 13 and the first connecting portion 11 and the distance between the first connecting portion 11 and the second connecting portion 12, the fuse portion 13 can be positioned away from the first connecting portion 11, and further away from the battery cell 2 secured to the first connecting portion 11. This allows the fuse portion 13 to not affect the battery cell 2 when it blows. For example, when the fuse portion 13 blows, it will not affect the portion of the negative electrode tab of the battery cell 2 that extends beyond the positive electrode tab.

[0066] According to some embodiments of the present application, optionally, the distance between the fuse part 13 and the second connection part 12 may be in a range of 20% to 80% of the distance between the first connection part 11 and the second connection part 12. Further, the distance between the fuse part 13 and the second connection part 12 may be in a range of 50% to 60% of the distance between the first connection part 11 and the second connection part 12.

[0067] The distance between the fuse part 13 and the second connection part 12 is the distance between the fuse part 13 and the second connection part 12 along the length direction, and the distance between the first connection part 11 and the second connection part 12 is the distance between the first connection part 11 and the second connection part 12 along the length direction.

[0068] According to some embodiments, the distance between the fuse portion 13 and the second connection portion 12 may be in the range of 20% to 80% of the distance between the first connection portion 11 and the second connection portion 12, or in the range of 30% to 70%, or in the range of 40% to 60%, or in the range of 50% to 60%.

[0069] By defining the relationship between the distance between the fuse portion 13 and the second connection portion 12 and the distance between the first connection portion 11 and the second connection portion 12, the fuse portion 13 can be positioned away from the second connection portion 12, and further away from the weld mark region where the second connection portion 12 is located, and away from the terminal 5 connected to the second connection portion 12. This prevents the fuse portion 13 from affecting the weld mark region when it blows. For example, when the fuse portion 13 blows, the weld mark region can be prevented from simultaneously blowing.

[0070] According to some embodiments of the present application, optionally, the flow area of ​​the fuse portion 13 may be smaller than the flow area of ​​the rest of the tab 10, and the flow area of ​​the fuse portion 13 may be smaller than two-thirds of the flow area of ​​the first connecting portion 11 and / or smaller than two-thirds of the flow area of ​​the second connecting portion 12.

[0071] The flow area of ​​the fuse part 13 can be configured to be smaller than the flow area of ​​the rest of the tab 10, so that the resistance at the fuse part 13 is greater than the resistance of the rest of the tab 10. In this way, when a short circuit occurs outside the battery cell 2 connected to the electrode assembly 1, the fuse part 13 will melt before the rest of the tab 10 to disconnect the circuit, terminate the short circuit process, avoid thermal runaway of the battery cell 2, and protect the battery cell 2.

[0072] The flow area of ​​the fuse portion 13 can be configured to be less than two-thirds of the flow area of ​​the first connection portion 11 and / or less than two-thirds of the flow area of ​​the second connection portion 12, so that the fuse portion 13 will be directionally melted when a short circuit occurs outside the battery cell 2 connected to the electrode assembly 1, avoiding the remaining portion of the tab 10 from melting and affecting the battery cell 2 and the weld mark area. In an optional embodiment, the flow area of ​​the fuse portion 13 can be configured to be less than one-half of the flow area of ​​the first connection portion 11 and / or less than one-half of the flow area of ​​the second connection portion 12.

[0073] According to some embodiments of the present application, optionally, the width of the fuse portion 13 may be smaller than the width of the remaining portion of the tab 10 , and the width of the fuse portion 13 may be smaller than 80% of the average width of the tab 10 .

[0074] The width of the fuse portion 13 is the dimension of the fuse portion 13 along the width direction. The tab 10 is generally a sheet-like structure and can have a roughly uniform thickness. In this case, the width can directly reflect the flow area of ​​each part on the tab 10. The width of the fuse portion 13 can be configured to be smaller than the width of the remaining parts on the tab 10, so that the flow area of ​​the fuse portion 13 is smaller than the flow area of ​​the remaining parts on the tab 10, and then the resistance at the fuse portion 13 is greater than the resistance of the remaining parts on the tab 10. In this way, when a short circuit occurs outside the battery cell 2 connected to the electrode assembly 1, the fuse portion 13 will melt before the remaining parts on the tab 10, so as to disconnect the circuit, terminate the short circuit process, avoid thermal runaway of the battery cell 2, and play a role in protecting the battery cell 2.

[0075] In some embodiments, the width of the fuse portion 13 can be configured to be less than 80% of the average width of the tab 10. The average width here refers to the average width in a geometric sense and can be obtained when designing the tab 10. For example, after the shape of the tab 10 is determined, the average width of the tab 10 can be obtained. The width of the fuse portion 13 being less than 80% of the average width of the tab 10 allows the fuse portion 13 to fuse directionally when a short circuit occurs outside the battery cell 2 connected to the electrode assembly 1, preventing the remaining portion of the tab 10 from fusing and affecting the battery cell 2 and the weld mark area.

[0076] According to some embodiments of the present application, as shown in FIG. 4-8 , the tab 10 may optionally be provided with a missing portion 14 adjacent to the fuse portion 13 along the width direction and / or the thickness direction.

[0077] The missing portion 14 can be formed through the tab 10 and can have any suitable shape. The missing portion 14 is adjacent to the fuse portion 13, and together they constitute the structure of the tab 10 along the width and / or thickness direction. The fuse portion 13 can be formed by removing the missing portion 14 from the width and / or thickness direction of the tab 10. The shape of the fuse portion 13 and the shape of the missing portion 14 can be complementary.

[0078] According to some embodiments of the present application, as shown in FIG. 4-8 , optionally, the missing portion 14 may be in the form of a rectangular groove, a circular groove, and / or a triangular groove.

[0079] As shown in Figures 4-8, Figure 4 shows that the missing portion 14 is in the form of a triangular groove, Figure 5 shows that the missing portion 14 is in the form of a rectangular groove, Figure 6 shows that the missing portion 14 is in the form of a circular groove, Figure 7 shows that the missing portion 14 is in the form of a rectangular groove, and Figure 8 shows that the missing portion 14 is in the form of a triangular groove.

[0080] The missing portion 14 can be located on both sides of the fuse portion 13, that is, the fuse portion 13 is located between the two missing portions 14, as shown in Figures 4, 5, 7, and 8. The missing portion 14 can also be arranged alternately with the fuse portion 13, as shown in Figure 6.

[0081] As shown in Figures 4-6, the missing portion 14 and the fuse portion 13 can be formed by die-cutting the middle portion of the existing tab 10 to remove a portion of material. Specifically, as shown in Figures 4 and 5, die-cutting can be performed on both sides of the middle portion of the tab 10 to form the missing portion 14. The die-cut portion of the tab 10 along the width direction is the fuse portion 13. As shown in Figure 6, a number of openings can be die-cut in the middle portion of the tab 10. These openings form the missing portion 14. The die-cut portion of the tab 10 along the width direction is the fuse portion 13.

[0082] As shown in Figures 7-8, the missing portion 14 and the fuse portion 13 can also be formed by redesigning the tab 10. Specifically, as shown in Figure 7, the tab 10 can be designed to have an I-shaped shape, so that the width of the middle portion of the tab 10 is smaller than the width of the rest of the tab 10, forming the fuse portion 13. As shown in Figure 8, the tab 10 can be designed to have a saddle-like shape, so that the width of the middle portion of the tab 10 is smaller than the width of the rest of the tab 10, forming the fuse portion 13.

[0083] The fuse portion 13 can be formed by simply die-cutting the existing tab 10, without making any changes to the rest of the battery cell 100. No additional design is required, making the process simple, labor-saving, and cost-effective. Even if the tab 10 is redesigned, the rest of the battery cell 100 remains unchanged, requiring no additional design, making the process simple, labor-saving, and cost-effective.

[0084] According to some embodiments of the present application, as shown in FIG3 , optionally, an insulating layer 15 may be coated on the fuse portion 13. Further, the insulating layer 15 may include a first insulating layer 151 and a second insulating layer 152. The first insulating layer 151 may be disposed on a first surface of the fuse portion 13, and the second insulating layer 152 may be disposed on a second surface of the fuse portion 13 opposite to the first surface.

[0085] The insulating layer 14 has an insulating effect. The insulating layer 15 is coated on the outside of the fuse part 13, so that the fuse part 13 also has an insulating effect.

[0086] When a short circuit occurs outside the battery cell 2 connected to the electrode assembly 1, the short circuit is terminated due to the action of the fuse part 13. The fuse part 13 is covered with an insulating layer 15, which can prevent the fuse part 13 from overlapping the positive and negative electrodes of the battery cell 2 after the short circuit is terminated, thereby preventing the short circuit problem between the electrodes from occurring again after the fuse part 13 is melted.

[0087] According to some embodiments of the present application, optionally, the electrode assembly 1 may further include a transfer sheet connected to the second connection portion 12 of the electrode tab 10 .

[0088] The tab 10 is connected to the adapter plate through the second connection portion 12 , and the adapter plate is fixed to the pole 5 , so that the tab 10 is indirectly connected to the pole 5 through the adapter plate to achieve current conduction.

[0089] When there is no adapter, the tab 10 itself has a fusing effect, which can disconnect the circuit, terminate the short circuit process, prevent the battery cell 2 from thermal runaway, and protect the battery cell 2. When there is an adapter, the tab 10 according to the present application can also have a fusing effect, which can disconnect the circuit, terminate the short circuit process, prevent the battery cell 2 from thermal runaway, and protect the battery cell 2.

[0090] According to some embodiments of the present application, optionally, the present application further provides a battery cell 100 , which includes the electrode assembly 1 as described above.

[0091] In some embodiments, as described above, the battery cell 100 includes a top cover 3, a shell 4, a battery cell 2 and an electrode assembly 1. The electrode assembly 1 can be fixedly arranged at both ends of the battery cell 2 and connected to the pole 5 on the top cover 3 through the electrode assembly 1. The shell 4 is arranged outside the battery cell 2, and the shell 4 can be an integrated structure with the top cover 3.

[0092] According to some embodiments of the present application, optionally, the present application further provides a battery, which includes the battery cell 100 as described above.

[0093] According to some embodiments of the present application, optionally, the present application further provides an electrical device, which includes the battery as described above, and the battery is used to provide electrical energy.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: The battery cell comprises: shell; pole; a battery cell, the battery cell being disposed in the housing; and an electrode assembly configured to connect the electrode post and the battery cell, the electrode assembly comprising a tab having a first connection portion at one end and a second connection portion at the other end, the first connection portion being configured to be coupled to the battery cell, and the second connection portion being configured to be coupled to the electrode post; A fuse portion is formed on the tab, and the fuse portion is arranged between the first connecting portion and the second connecting portion.

2. The battery cell according to claim 1, wherein: A distance between the fuse portion and the first connection portion is in a range of 20% to 80% of a distance between the first connection portion and the second connection portion.

3. The battery cell according to claim 1, wherein: A distance between the fuse portion and the first connection portion is in a range of 40% to 50% of a distance between the first connection portion and the second connection portion.

4. The battery cell according to claim 1, wherein: A distance between the fuse portion and the second connection portion is in a range of 20% to 80% of a distance between the first connection portion and the second connection portion.

5. The battery cell according to claim 1, characterized in that A distance between the fuse portion and the second connection portion is in a range of 50% to 60% of a distance between the first connection portion and the second connection portion.

6. The battery cell according to claim 1, characterized in that The flow area of ​​the fuse portion is smaller than the flow area of ​​the remaining portion of the tab, and the flow area of ​​the fuse portion is smaller than two-thirds of the flow area of ​​the first connection portion and / or smaller than two-thirds of the flow area of ​​the second connection portion.

7. The battery cell according to claim 1, characterized in that The width of the fuse portion is smaller than the width of the remaining portion of the tab, and the width of the fuse portion is smaller than 80% of the average width of the tab.

8. The battery cell according to claim 1, wherein: The tab is provided with a missing portion adjacent to the fuse portion along a width direction and / or a thickness direction.

9. The battery cell according to claim 8, characterized in that The missing portion is in the form of a rectangular groove, a circular groove and / or a triangular groove.

10. The battery cell according to claim 1, characterized in that The fuse part is covered with an insulating layer.

11. The battery cell according to claim 10, characterized in that The insulating layer includes a first insulating layer and a second insulating layer. The first insulating layer is disposed on a first surface of the fuse part, and the second insulating layer is disposed on a second surface of the fuse part opposite to the first surface.

12. The battery cell according to claim 1, wherein The electrode assembly further includes a transfer plate coupled to the second connection portion of the tab.

13. A battery, characterized in that: The battery includes the battery cell according to any one of claims 1 to 12.

14. An electrical device, characterized in that: The electric device comprises the battery according to claim 13, wherein the battery is used to provide electric energy.

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