Battery monomer, battery and electric device

Abstract

The present application relates to a battery cell comprising: a housing; a pole; the battery cell is arranged in the shell; the electrode assembly is configured to be used for connecting the pole and the battery cell, the electrode assembly comprises a tab, the tab is provided with a first connecting part at one end and a second connecting part at the other end, the first connecting part is configured to be connected to the battery cell, and the second connecting part is configured to be connected to the battery cell. The second connection portion is configured to be coupled to the post. A fusing part is formed on the tab, and the fusing part is arranged between the first connecting part and the second connecting part. The utility model also relates to a battery and an electric device.

Description

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 the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important 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 pole piece 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 melt at the same time. Utility Model Content

[0004] In view of the above problems, the present application provides a battery cell, a battery and an electrical device, which can cause the electrode tabs of the electrode assembly 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.

[0005] In order to solve the above technical problems, the embodiments of the present application provide the following technical solutions:

[0006] In a first aspect, the present application provides a battery cell, comprising: 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 comprising a pole ear, the pole ear 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 pole ear, the fuse portion being arranged between the first connection portion and the second connection portion.

[0007] A fuse is provided on the pole ear, so that the pole ear 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 a relatively large resistance, and is an area that is relatively easy to fuse. 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, avoiding thermal runaway of the battery cell and protecting the battery cell.

[0008] In some embodiments of the battery cell, 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.

[0009] 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.

[0010] In some embodiments of the battery cell, 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.

[0011] In some embodiments of the battery cell, 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.

[0012] 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 pole lug, and the flow area of ​​the fuse portion is smaller than two-thirds of the flow area of ​​the first connecting portion and / or smaller than two-thirds of the flow area of ​​the second connecting portion.

[0013] In some embodiments of the battery cell, the width of the fuse portion is smaller than the width of the remaining portion of the electrode tab, and the width of the fuse portion is smaller than 80% of the average width of the electrode tab.

[0014] In some embodiments of the battery cell, the electrode tab is provided with a missing portion adjacent to the fuse portion along the width direction and / or the thickness direction.

[0015] 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.

[0016] In some embodiments of the battery cell, the fuse portion is coated with an insulating layer.

[0017] 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.

[0018] In some embodiments of the battery cell, the electrode assembly further includes a transition piece connected to the second connection portion of the electrode tab.

[0019] In a second aspect, the present application provides a battery, which includes the battery cell in the above embodiment.

[0020] 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.

[0021] 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

[0022] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0023] Figure 1 is an exploded schematic diagram of a battery cell according to some embodiments of the present application;

[0024] Figure 2 is a cross-sectional view of a battery cell according to some embodiments of the present application;

[0025] Figure 3 for Figure 2 An enlarged schematic diagram of the middle part A;

[0026] Figure 4 is a schematic diagram of a tab of an electrode assembly according to some embodiments of the present application;

[0027] Figure 5 is a schematic diagram of a tab of an electrode assembly according to some embodiments of the present application;

[0028] Figure 6 is a schematic diagram of a tab of an electrode assembly according to some embodiments of the present application;

[0029] Figure 7 is a schematic diagram of a tab of an electrode assembly according to some embodiments of the present application; and

[0030] Figure 8 is a schematic diagram of a tab of an electrode assembly according to some embodiments of the present application;

[0031] The reference numerals in the specific implementation manner are as follows:

[0032] 100 battery cells;

[0033] 1 electrode assembly; 2 battery cell; 3 top cover; 4 outer shell; 5 pole;

[0034] 10 pole ear; 11 first connecting portion; 12 second connecting portion; 13 fuse portion; 14 missing portion; 15 insulating layer; 151 first insulating layer; 152 second insulating layer. DETAILED DESCRIPTION

[0035] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field 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" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0037] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0038] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0039] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0040] 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).

[0041] 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. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0042] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0043] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0044] As the scope and field of power battery applications continue to expand, battery safety issues have received 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.

[0045] It is noted that in order to increase the space utilization rate inside the battery cell, many existing power batteries have eliminated the adapter and directly welded the electrode assembly to the top cover pole. Since there is no adapter, it is impossible to set a fuse area on the adapter. Therefore, when an external short circuit occurs in the battery cell, there is no pre-set fuse area in the overcurrent chain of the battery cell, and the overcurrent chain cannot be cut off, resulting in long-term high-current discharge of the entire battery cell, causing thermal runaway of the battery cell and causing safety problems.

[0046] In order to solve the problem that the current chain cannot be cut off when the battery cell is short-circuited externally without an adapter, the research found that a fuse can be set on the electrode assembly. Specifically, a slot is punched out on the electrode assembly, or a missing portion with a slot is directly formed on the electrode assembly, and the remaining area is the fuse, so that the current cross-section of the fuse is small and the resistance is relatively large, which is an area that is easier to fuse. 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 of the electrode assembly has a small current cross-section and a relatively large resistance, when the current passes through the fuse, the fuse melts and terminates the short circuit process, avoiding thermal runaway of the battery cell and protecting the battery cell.

[0047] Based on the above considerations, in order to solve the situation that is easy to cause safety problems when a short circuit occurs outside the battery cell, after in-depth research, an electrode assembly is designed, which has a fuse part formed on the pole ear. The fuse part has a relatively small current flow area and a relatively large resistance, thereby having a fuse effect. When a short circuit occurs outside the battery cell connected to the electrode assembly, the fuse part can melt, terminate the short circuit process, avoid thermal runaway caused by the external short circuit of the battery cell, and play a role in protecting the battery cell.

[0048] At the same time, the fuse is designed to be located approximately in the middle of the tab, away from the root of the tab connected to the battery cell, and away from the weld print area where the tab is connected to the pole, that is, the fuse is away from the battery cell and the pole, so that the fuse will not affect the battery cell and the weld print area when it is melted. For example, if the fuse is away from the battery cell, the part of the negative electrode sheet of the battery cell that exceeds the positive electrode sheet (overhang) will not be affected (for example, burned) when the fuse is melted, and the fuse is away from the weld print area, which can avoid the fuse from causing the weld print area to melt at the same time when the fuse is melted. In this way, the fuse can avoid causing secondary hazards when it melts, thereby improving battery safety.

[0049] The electrode assembly disclosed in the embodiment of the present application is a part of a battery, and the battery can be used in, but 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 the present application can be used to form the electrical device, so that when a short circuit occurs outside the battery cell, the battery cell can be fused to avoid thermal runaway of the battery cell, thereby protecting the battery cell.

[0050] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, 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., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0051] According to some embodiments of the present application, Figure 1-8 As shown, 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 pole ear 10, the pole ear 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 pole ear 10, and the fuse portion 13 may be arranged between the first connection portion 11 and the second connection portion 12.

[0052] like Figure 1-3 As shown, a battery cell 100 according to some embodiments of the present application is shown, wherein 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 may be a shell with openings at both ends, 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 may be arranged on the top cover 3, and the electrode assembly 1 is used to connect the battery cell 2 and the pole 5.

[0053] According to some embodiments, Figure 3-8 As shown, the electrode assembly 1 may include a tab 10 configured to connect the battery cell 2 and the pole 5. One end of the tab 10 may be fixed to the battery cell 2, and the other end may be connected to the pole 5. In some embodiments, the tab 10 may be directly welded to the pole 5 through a weld stamping area, and in other embodiments, the tab 10 may be indirectly connected to the pole 5 through a transition piece.

[0054] 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 pole 5 or connected to the pole 5 through a transition piece. In this way, the tab 10 is connected between the battery cell 2 and the pole 5 through the first connection portion 11 and the second connection portion 12 to achieve current conduction.

[0055] According to some embodiments, Figure 3-8 As shown, a fuse 13 may be formed on the pole tab 10, and the fuse 13 has a larger resistance than other parts of the pole tab 10, so it has a fusing effect. When a short circuit occurs outside the battery cell 2 connected to the electrode assembly 1, a large current is instantly generated inside the battery cell 2. In this case, when the current reaches the fuse 13, the fuse 13 is melted, thereby terminating the short circuit process, avoiding thermal runaway of the battery cell 2, and protecting the battery cell 2.

[0056] 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 is blown, 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.

[0057] According to some embodiments, Figure 3-8 As shown, the fuse 13 can be set at a certain distance from the first connection part 11 and at a certain distance from the second connection part 12. The fuse 13 is set at a certain distance from the first connection part 11, so that the fuse 13 can be away from the first connection part 11, and then away from the battery cell 2 fixed to the first connection part 11, so that the fuse 13 will not affect the battery cell 2 when it is melted. For example, when the fuse 13 melts, it will not affect the part of the negative electrode plate of the battery cell 2 that exceeds the positive electrode plate. The fuse 13 is set at a certain distance from the second connection part 12, so that the fuse 13 can be away from the second connection part 12, and then away from the weld mark area where the second connection part 12 is located and away from the pole 5 connected to the second connection part 12, so that the fuse 13 will not affect the weld mark area when it is melted. For example, when the fuse 13 melts, it can avoid causing the weld mark area to melt at the same time.

[0058] A fuse 13 is provided on the pole ear 10, so that the pole ear 10 itself has a fuse 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 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 13, the fuse 13 fuses and terminates the short circuit process, thereby avoiding thermal runaway of the battery cell 2 and protecting the battery cell 2.

[0059] In addition, the fuse part 13 is set at a certain distance from the first connection part 11 and at a certain distance from the second connection part 12, so that the fuse part 13 is far away from the battery cell 2 and the pole 5. When the fuse part 13 melts, it can avoid causing secondary hazards and improve battery safety.

[0060] 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 the 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 the range of 40% to 50% of the distance between the first connection part 11 and the second connection part 12.

[0061] like Figure 4-8As shown, it shows a schematic diagram of the pole ear 10 of different embodiments. For the sake of clarity of description, the X direction and the Y direction are shown in the figure, wherein the X direction is Figure 4-8 The left and right directions of the page are defined as the width direction of the tab 10, and the Y direction is Figure 4-8 The vertical direction of the page is defined as the length direction of the tab 10. Thus, the thickness direction of the tab 10 is perpendicular to the length direction and the width direction of the tab 10. Figure 4-8 The vertical orientation of the page.

[0062] 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.

[0063] According to some embodiments, the distance between the fuse portion 13 and the first connection portion 11 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 40% to 50%.

[0064] By defining the relationship between the distance between the fuse part 13 and the first connection part 11 and the distance between the first connection part 11 and the second connection part 12, the fuse part 13 can be kept away from the first connection part 11, and then away from the battery cell 2 fixed to the first connection part 11, so that the fuse part 13 will not affect the battery cell 2 when it is blown. For example, when the fuse part 13 is blown, it will not affect the part of the negative electrode plate of the battery cell 2 that exceeds the positive electrode plate.

[0065] 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 the 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 the range of 50% to 60% of the distance between the first connection part 11 and the second connection part 12.

[0066] 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.

[0067] 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%.

[0068] By defining the relationship between the distance between the fuse part 13 and the second connection part 12 and the distance between the first connection part 11 and the second connection part 12, the fuse part 13 can be kept away from the second connection part 12, and then away from the weld mark area where the second connection part 12 is located and away from the pole 5 connected to the second connection part 12, so that the fuse part 13 will not affect the weld mark area when it is blown. For example, when the fuse part 13 is blown, it can be avoided that the weld mark area is blown at the same time.

[0069] 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.

[0070] The flow area of ​​the fuse part 13 can be configured to be smaller than the flow area of ​​the rest of the pole tab 10, so that the resistance at the fuse part 13 is larger than the resistance of the rest of the pole 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 pole 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.

[0071] The flow area of ​​the fuse 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 13 is directionally fused when a short circuit occurs outside the battery cell 2 connected to the electrode assembly 1, thereby preventing the remaining part of the tab 10 from fusing and affecting the battery cell 2 and the weld mark area. In an optional embodiment, the flow area of ​​the fuse 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.

[0072] 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 electrode tab 10 , and the width of the fuse portion 13 may be smaller than 80% of the average width of the electrode tab 10 .

[0073] The width of the fuse 13 is the dimension of the fuse 13 along the width direction. The tab 10 is usually a sheet 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 13 can be configured to be smaller than the width of the rest of the tab 10, so that the flow area of ​​the fuse 13 is smaller than the flow area of ​​the rest of the tab 10, and then the resistance at the fuse 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 13 will be blown 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.

[0074] 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, which 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 is less than 80% of the average width of the tab 10, so that the fuse portion 13 can be directional fused when a short circuit occurs outside the battery cell 2 connected to the electrode assembly 1, thereby preventing the remaining portion of the tab 10 from fusing and affecting the battery cell 2 and the weld print area.

[0075] According to some embodiments of the present application, Figure 4-8 As shown, optionally, the electrode tab 10 may be provided with a missing portion 14 adjacent to the fuse portion 13 along the width direction and / or the thickness direction.

[0076] The missing portion 14 may be formed by penetrating the tab 10 and may have any suitable shape. The missing portion 14 is adjacent to the fuse portion 13, and the missing portion 14 and the fuse portion 13 together constitute the structure of the tab 10 along the width direction and / or the thickness direction. The fuse portion 13 may be formed by removing the missing portion 14 in the width direction and / or the thickness direction of the tab 10. The shape of the fuse portion 13 may be complementary to the shape of the missing portion 14.

[0077] According to some embodiments of the present application, Figure 4-8 As shown, optionally, the missing portion 14 may be in the form of a rectangular groove, a circular groove and / or a triangular groove.

[0078] like Figure 4-8 As shown, Figure 4 The missing portion 14 is shown to be in the form of a triangular groove. Figure 5 The missing portion 14 is shown to be in the form of a rectangular groove. Figure 6 The missing portion 14 is shown to be in the form of a circular groove. Figure 7 The missing portion 14 is shown to be in the form of a rectangular groove. Figure 8 The missing portion 14 is shown in the form of a triangular groove.

[0079] The missing portion 14 may be located at both sides of the fuse portion 13, that is, the fuse portion 13 is located between the two missing portions 14. Figure 4 , 5 , 7, and 8. The missing portion 14 may also be arranged alternately with the fuse portion 13, as shown in FIG. Figure 6 shown.

[0080] like Figure 4-6 As shown, the missing portion 14 and the fuse portion 13 can be formed by die-cutting from the middle of the pole lug 10 to remove a portion of the material based on the existing pole lug 10. Specifically, as Figure 4 and 5 As shown, die cutting can be performed on both sides of the middle of the tab 10 to form a missing portion 14, and the die-cut portion of the tab 10 along the width direction is the fuse portion 13. Figure 6 As shown, a plurality of holes can be die-cut in the middle of the pole tab 10 , and these holes form the missing portion 14 . The die-cut portion of the pole tab 10 along the width direction is the fuse portion 13 .

[0081] like Figure 7-8 As shown, the missing portion 14 and the fuse portion 13 can also be formed by redesigning the tab 10. Specifically, as Figure 7 As shown, 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 a fuse portion 13. Figure 8 As shown, the pole lug 10 may be designed to have a saddle-like shape, so that the width of the middle portion of the pole lug 10 is smaller than the width of the remaining portion of the pole lug 10 , thereby forming a fuse portion 13 .

[0082] The fuse portion 13 can be formed by simply die-cutting the existing tab 10, without any changes to the rest of the battery cell 100, without additional design, simple operation, labor and cost saving. Even if the tab 10 is redesigned, the rest of the battery cell 100 will not be changed, without additional design, simple operation, labor and cost saving.

[0083] According to some embodiments of the present application, Figure 3 As shown, optionally, the fuse part 13 may be coated with an insulating layer 15. 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 arranged on a first surface of the fuse part 13, and the second insulating layer 152 may be arranged on a second surface of the fuse part 13 opposite to the first surface.

[0084] The insulating layer 14 has an insulating effect. The insulating layer 15 is coated outside the fuse part 13, so that the fuse part 13 also has an insulating effect.

[0085] 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 coated with an insulating layer 15 to 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.

[0086] According to some embodiments of the present application, optionally, the electrode assembly 1 may further include a transition piece connected to the second connection portion 12 of the electrode tab 10 .

[0087] The pole tab 10 is connected to the adapter plate through the second connecting portion 12 , and the adapter plate is fixed to the pole 5 , so that the pole tab 10 is indirectly connected to the pole 5 through the adapter plate to achieve current conduction.

[0088] When there is no adapter, the tab 10 itself has a fusing effect, which can disconnect the circuit, terminate the short circuit process, avoid thermal runaway of the battery cell 2, and protect the battery cell 2. In the case of 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, avoid thermal runaway of the battery cell 2, and protect the battery cell 2.

[0089] 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.

[0090] 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 disposed 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 sleeved outside the battery cell 2, and the shell 4 can be an integrated structure with the top cover 3.

[0091] According to some embodiments of the present application, optionally, the present application also provides a battery, which includes the battery cell 100 as described above.

[0092] According to some embodiments of the present application, optionally, the present application also provides an electrical device, which includes the battery as described above, and the battery is used to provide electrical energy.

[0093] 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 replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate 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, wherein the battery cell is disposed in the housing; and an electrode assembly configured to connect the pole and the battery cell, the electrode assembly comprising a pole 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 pole; A fuse portion is formed on the electrode 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, characterized in that: 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, characterized in that: 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, characterized in that: 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 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 electrode tab, and the width of the fuse portion is smaller than 80% of the average width of the electrode tab.

8. The battery cell according to claim 1, characterized in that: The electrode 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, characterized in that: The electrode assembly further includes a transfer sheet connected to the second connection portion of the electrode tab.

13. A battery, characterized in that: The battery comprises 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.

Images