WO2023221598A1 - Connecting assembly, battery cell, battery, and electrical device - Google Patents

Abstract

The present application relates to the technical field of batteries, and to a connecting assembly, a battery cell, a battery, and an electrical device. The connecting assembly is used for a battery cell, and the connecting assembly comprises: a connecting member, comprising a first connecting portion, a second connecting portion, and a third connecting portion used for connecting the first connecting portion and the second connecting portion, a fusing portion being formed between the first connecting portion and the third connecting portion, and the first connecting portion, the fusing portion and the third connecting portion being arranged in a first direction; and an insulating member, covering the fusing portion, the insulating member comprising a first insulating layer and a second insulating layer, the first insulating layer being disposed on the side of the connecting member facing an electrode assembly, and the second insulating layer being disposed on the side of the connecting member facing away from the electrode assembly. In the first direction, a maximum distance from the end of the first insulating layer distant from the first connecting portion to the fusing portion is greater than a minimum distance from the end of the second connecting portion close to the fusing portion to the fusing portion. The connecting assembly is applied to a battery cell and can improve the safety of the battery cell.

Description

Connect components, battery cells, batteries and electrical equipment

Cross-references to related applications

This application claims priority to Chinese patent application CN202221231932.3 titled "Connection Components, Battery Cells, Batteries and Electrical Equipment" submitted on May 20, 2022. The entire content of this application is incorporated herein by reference. middle.

Technical field

The present application relates to the field of battery technology, specifically, to a connecting component, a battery cell, a battery and electrical equipment.

Background technique

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 related to their development.

In the development of battery technology, in addition to improving the energy density of batteries, safety is also an issue that cannot be ignored. Therefore, how to improve the safety of batteries is an urgent technical problem that needs to be solved in battery technology.

Contents of the invention

The purpose of this application is to provide a connecting component, a battery cell, a battery and an electrical device. This connection component is applied to a battery cell and can improve the safety of the battery cell.

This application is realized through the following technical solutions:

In a first aspect, the present application provides a connection assembly for a battery cell. The connection assembly includes: a connection piece, including a first connection part for connecting the tab of the electrode assembly, and a second connection for connecting the electrode terminal. part, a third connection part for connecting the first connection part and the second connection part, a fuse part is formed between the first connection part and the third connection part, the first connection part , the fuse part and the third connecting part are arranged along the first direction; an insulating member wraps the fuse part, the insulating member includes a first insulating layer and a second insulating layer, and the first insulating layer is disposed on The side of the connecting member facing the electrode assembly, the second insulating layer is provided on the side of the connecting member away from the electrode assembly; wherein, along the first direction, the first insulating layer The maximum distance from the end of the layer away from the first connection part to the fuse part is greater than the minimum distance from the second connection part to the fuse part.

According to the connection assembly of the embodiment of the present application, the maximum distance from the end of the first insulating layer away from the first connection part in the first direction to the fuse part is greater than the minimum distance from the second connection part to the fuse part. By increasing the first insulating layer The size in the first direction increases the coverage area of the first insulating layer on the side of the connector facing the electrode assembly, In turn, the insulating member has a better insulating effect on the side of the connecting member facing the electrode assembly, thereby improving the safety of the battery cell including the connecting assembly.

According to some embodiments of the present application, along the thickness direction of the connecting piece, the projection of the first insulating layer on the connecting piece does not overlap with the second connecting part.

In the above solution, the projection of the first insulating layer on the connecting piece does not overlap with the second connecting part, preventing the first insulating layer from extending to the formation position of the second connecting part, and avoiding interference with other components when the battery cells are assembled. Assembly interference ensures assembly accuracy.

According to some embodiments of the present application, the first insulation layer includes a first escape portion for avoiding the second connection portion, and an edge of the first escape portion surrounds at least a part of the second connection portion, so The minimum distance between the edge of the first escape part and the edge of the second connection part is h1, which satisfies 0.5mm≤h1≤2mm.

In the above solution, when the second connecting portion is stamped and formed, the second connecting portion is formed by a recess from the side of the connecting piece facing the electrode assembly toward the side of the connecting piece facing away from the electrode assembly. The connecting piece is formed in the second connecting portion. There is a deformation area at the position, and the minimum distance between the edge of the first escape part and the edge of the second connection part meets the above range. On the one hand, the first insulating layer has a larger area on the side of the connector facing the electrode assembly. , so that the first insulating layer has a better insulation effect. On the other hand, it can reduce the risk that the edge of the first insulating layer covers the deformation area and affect the assembly accuracy, ensuring the assembly accuracy of the connecting component and other components.

According to some embodiments of the present application, along the extending direction of the edge of the first escape part, the distance between the edge of the first escape part and the edge of the second connection part is equal.

In the above solution, the distance between the edge of the first escape part and the edge of the second connection part is equal, ensuring that the first insulating layer can have a larger area to have better performance on the side of the connector facing the electrode assembly. insulation effect.

According to some embodiments of the present application, along the first direction, a maximum distance from an end of the first insulating layer away from the first connection part to the fuse part is less than an end of the second connection part away from the The maximum distance from one end of the fuse to the fuse.

In the above solution, the maximum distance from the end of the first insulating layer away from the first connection part to the fuse part is less than the maximum distance from the end of the second connection part away from the fuse part to the fuse part, and the first insulating layer is in the first direction. The end that does not exceed the second connecting part and is away from the fuse part reduces the difficulty of processing and forming the first insulating layer.

According to some embodiments of the present application, along the thickness direction of the connecting piece, the projection of the second insulating layer on the connecting piece does not overlap with the second connecting part.

In the above solution, the projection of the second insulating layer on the connecting piece does not overlap with the second connecting part, which prevents the second insulating layer from extending to the formation position of the second connecting part, and avoids interference with other components when the battery cells are assembled. Assembly interference ensures assembly accuracy.

According to some embodiments of the present application, the second insulation layer includes a second escape portion for avoiding the second connection portion, and an edge of the second escape portion surrounds at least a part of the second connection portion, so The minimum distance between the edge of the second escape part and the edge of the second connecting part is h2, which satisfies 0.5mm≤h2≤2mm.

In the above solution, when the second connecting portion is stamped and formed, the second connecting portion is formed by a recess from the side of the connecting piece facing the electrode assembly toward the side of the connecting piece facing away from the electrode assembly. The connecting piece is formed in the second connecting portion. There is a deformation area at the position, and the minimum distance between the edge of the second escape part and the edge of the second connection part satisfies the above range, on the one hand, the second insulating layer has a larger area on the side of the connector away from the electrode assembly, so that the second insulating layer has a better insulating effect, on the other hand, it can reduce the edge coverage deformation of the first insulating layer The risk of affecting the assembly accuracy in the area must be ensured to ensure the assembly accuracy of the connecting component and other parts.

According to some embodiments of the present application, along the first direction, a maximum distance from an end of the second insulating layer away from the first connection part to the fuse part is greater than a distance from the second connection part to the fuse part. minimum distance.

In the above solution, the second insulating layer exceeds an end of the second connecting portion close to the fuse portion in the first direction, so that the second insulating layer has a larger area and has a better insulation effect.

According to some embodiments of the present application, along the first direction, a maximum distance from an end of the second insulating layer away from the first connection part to the fuse part is less than an end of the second connection part away from the The maximum distance from one end of the fuse to the fuse.

In the above solution, the maximum distance from the end of the second insulating layer away from the first connection part to the fuse part is less than the maximum distance from the end of the second connection part away from the fuse part to the fuse part, and the second insulating layer is in the first direction. It does not exceed the fuse part, which reduces the difficulty of processing and forming the second insulation layer.

According to some embodiments of the present application, the insulating member further includes two fourth connecting parts, and the two fourth connecting parts respectively cover at least part of two edges of the connecting piece that are opposite along the second direction, The second direction is perpendicular to the first direction and the thickness direction of the connecting member, and the first insulating layer and the second insulating layer are connected through the two fourth connecting parts.

In the above solution, the first insulating layer and the second insulating layer are connected through the fourth connecting part to ensure the connection strength between the insulating part and the connecting part.

According to some embodiments of the present application, the third connection part is provided with a channel, and the insulation member further includes a fifth connection part, the fifth connection part fills the channel and connects the first insulation layer and the Second insulation layer.

In the above solution, the channel is arranged to facilitate the accommodation of the fifth connecting part, so that the fifth connecting part connects the first insulating layer and the second insulating layer to ensure a stable connection between the insulating piece and the connecting piece.

According to some embodiments of the present application, the connecting piece has a notch, the notch is located on at least one side of the fuse portion along a second direction, and the second direction is perpendicular to the first direction and the connecting piece. In the thickness direction, the insulating member further includes a sixth connecting portion, the sixth connecting portion fills the gap and connects the first insulating layer and the second insulating layer.

In the above solution, the gap formed on the connecting piece reduces the flow area here, which can play a safety role; the sixth connecting part fills the gap, and the sixth connecting part connects the first insulating layer and the second insulating layer , making the connection between the insulating parts and the connecting parts stable, and having better insulation and isolation effect.

According to some embodiments of the present application, the insulating part is injection molded on the connecting part.

In the above solution, the insulating part is injection molded on the connecting part, which facilitates processing and manufacturing, and the connection between the insulating part and the connecting part is stable.

In a second aspect, the application also provides a battery cell, including: a casing including a wall; an electrode assembly disposed in the casing; and an electrode terminal disposed on the wall; as described in any of the above embodiments In the above-mentioned connecting component, the first connecting part is connected to the tab of the electrode assembly, and the second connecting part is connected to the electrode terminal.

In a third aspect, the present application also provides a battery, including the battery cell as described in any of the above embodiments.

In a fourth aspect, this application also provides an electrical device, including the battery as described in any of the above embodiments.

Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.

Description of the drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application and therefore do not It should be regarded as a limitation of the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without exerting creative efforts.

Figure 1 is a schematic structural diagram of a vehicle provided by some embodiments of the present application;

Figure 2 is a schematic diagram of the exploded structure of a battery provided by some embodiments of the present application;

Figure 3 is a schematic diagram of the exploded structure of a battery cell provided by some embodiments of the present application;

Figure 4 is a schematic structural diagram of a connection component provided by some embodiments of the present application;

Figure 5 is an exploded schematic structural diagram of a connection component provided by some embodiments of the present application;

Figure 6 is a schematic diagram of the assembly of the first insulating layer and the connector provided by some embodiments of the present application;

Figure 7 is a schematic diagram of the assembly of the second insulating layer and the connector provided by some embodiments of the present application;

Figure 8 is a cross-sectional view along the A-A direction of Figure 7;

Figure 9 is a cross-sectional view along the B-B direction of Figure 6;

Figure 10 is a cross-sectional view along the C-C direction of Figure 7;

In the drawings, the drawings are not drawn to actual scale.

Marking description: 100-battery; 10-box; 11-first part; 12-second part; 20-battery cell; 21-end cover; 21a-electrode terminal; 22-casing; 23-electrode assembly; 23a -Tab; 24-connection component; 241-connector; 241a-first surface; 241b-second surface; 2411-first connection part; 2412-second connection part; 2413-third connection part; 2413a-channel ; 2414-fuse part; 2414a-notch; 242-insulator; 2421-first insulation layer; 2421a-first avoidance part; 2422-second insulation layer; 2422a-second avoidance part; 2423-fourth connection part; 2424-fifth connection part; 2425-sixth connection part; 200-controller; 300-motor; 1000-vehicle.

Detailed ways

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

Unless otherwise defined, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the technical field belonging to this application; the terms used herein are for the purpose of describing specific embodiments only and are not intended to be used in Limitation of this application; the terms "including" and "having" and any variations thereof in the description and claims of this application and the above description of the drawings are intended to cover non-exclusive inclusion.

In the description of the embodiments of this application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying the relative importance or implicitly indicating the quantity or specificity of the indicated technical features. Shun order or priority relationship.

Reference herein to "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearances of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those skilled in the art understand, both explicitly and implicitly, that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of this application, the term "and/or" is only an association relationship describing associated objects, indicating that there can be three relationships, such as A and/or B, which can mean: A exists, and A and A exist simultaneously. B, there are three situations B. In addition, the character "/" in this article generally indicates that the related objects are an "or" relationship.

In the description of the embodiments of this application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to means two or more pieces (including two pieces), unless otherwise clearly and specifically limited.

In the description of the embodiments of this application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right" and "vertical" The orientation or positional relationships indicated by "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on those shown in the accompanying drawings. The orientation or positional relationship is only for the convenience of describing the embodiments of the present application and simplifying the description. It does 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 implementation of the present application. Example limitations.

In the description of the embodiments of this application, unless otherwise clearly stated and limited, technical terms such as "installation", "connection", "connection" and "fixing" should be understood in a broad sense. For example, it can be a fixed connection or a removable connection. It can be disassembled and connected, or integrated; it can also be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two elements or an interaction between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances.

In this application, the battery mentioned refers to a single physical module including 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.

The battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode plate, a negative electrode plate and a separator. Battery cells mainly rely on the movement of metal ions between the positive and negative electrodes to work. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode current collector. The current collector without the positive electrode active material layer is used as a positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganate, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The current collector without the negative electrode active material layer is used as a negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon. In order to ensure that large currents can pass through without melting, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. The material of the isolation film can be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene), etc.

The battery cell also includes a connecting piece, which is used to electrically connect the tabs of the electrode assembly and the electrode terminals.

The development of battery technology must consider multiple design factors at the same time, such as energy density, discharge capacity, Performance parameters such as charge and discharge rates. In addition, the safety of the battery also needs to be considered.

In order to ensure the safety of the battery cells, the connector usually includes a fuse. When a short circuit occurs in the external circuit, the current flowing through the connector will increase. When the current exceeds a certain threshold, the fuse is blown, thereby disconnecting the circuit. . In order to ensure that the circuit remains open after fusing and to avoid re-overlap of the fusing position, the existing fusing part will be designed with insulating parts to maintain the distance between both sides of the fusing part. However, the size of the insulating part is usually small and is only provided at the fusing part. In actual use, the tabs may be too long, causing the two parts of the connector on both sides of the fuse part to overlap, or the electrolyte may enter the inside of the fuse part, causing the two parts of the connector to be electrically reconnected after the fuse is broken. The insulation reliability between the battery and the electrode assembly is poor, and the safety performance of the battery cell is poor, and short circuit is prone to occur. In serious cases, it may cause safety risks such as fire and explosion.

In view of this, in order to solve the problem of poor insulation reliability between the connector and the electrode assembly, resulting in poor safety of the battery cells, the inventor, after in-depth research, designed a connection assembly for the battery cells to increase the insulation The coverage area of the connector on both sides of the connector can, on the one hand, reduce the risk of re-overlap of the two parts of the connector after the fuse part is blown due to too long tabs. On the other hand, it can increase the insulation area and reduce the arcing phenomenon, thus improving the performance of the connector. The safety of the battery cells of this connection component.

In such a battery cell, the insulating member includes a first insulating layer and a second insulating layer. The first insulating layer is disposed on a side of the connecting member facing the electrode assembly, and the second insulating layer is disposed on a side of the connecting member facing away from the electrode assembly. On one side, the first insulating layer and the second insulating layer provide insulation isolation on opposite sides of the connector respectively, and the first insulating layer has a larger coverage area on the side of the connector facing the electrode assembly, which improves the efficiency of the connector. The insulation effect with the electrode assembly reduces the risk of short circuit, making the battery cells highly safe.

The battery cells disclosed in the embodiments of the present application can be used in, but are not limited to, electrical devices such as vehicles, ships, or aircrafts. A power supply system including the battery cells, batteries, etc. disclosed in this application can be used to form the electrical device.

Embodiments of the present application provide an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, a mobile phone, a tablet computer, a laptop, an electric toy, an electric tool, an electric bicycle, an electric motorcycle, an electric car, a ship, Spacecraft and more. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, spaceships, etc.

For the convenience of explanation in the following embodiments, an electric device 1000 according to an embodiment of the present application is used as an example.

Please refer to FIG. 1 , which is a schematic structural diagram of a vehicle 1000 provided by some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. The battery 100 is disposed inside the vehicle 1000 , and the battery 100 may be disposed at the bottom, head, or tail of the vehicle 1000 . The battery 100 can be used to provide power for the vehicle 1000. For example, the battery 100 can be used as an operating power source for the vehicle 1000 and used for the vehicle's circuit system, such as for starting, navigating, and operating power requirements of the vehicle.

The vehicle 1000 may also include a controller 200 and a motor 300 . The controller 200 is used to control the battery 100 to provide power to the motor 300 , for example, for starting, navigating and driving the vehicle 1000 .

In some embodiments of the present application, the battery 100 can not only be used as an operating power source for the vehicle 1000 , but also can be used as a driving power source for the vehicle 1000 , replacing or partially replacing fuel or natural gas to drive the vehicle 1000 power.

Please refer to FIG. 2 , which is a schematic diagram of an exploded structure of the battery 100 provided by some embodiments of the present application. The battery 100 includes a case 10 and battery cells 20 , and the battery cells 20 are accommodated in the case 10 . Among them, the box 10 is used to provide an accommodation space for the battery cells 20, and the box 10 can adopt a variety of structures. In some embodiments, the box 10 may include a first part 11 and a second part 12 , the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define a space for accommodating the battery cells 20 of accommodation space. The second part 12 may be a hollow structure with one end open, and the first part 11 may be a plate-like structure. The first part 11 covers the open side of the second part 12 so that the first part 11 and the second part 12 jointly define a receiving space. ; The first part 11 and the second part 12 may also be hollow structures with one side open, and the open side of the first part 11 is covered with the open side of the second part 12. Of course, the box 10 formed by the first part 11 and the second part 12 can be in various shapes, such as cylinder, rectangular parallelepiped, etc.

In the battery 100, there may be a plurality of battery cells 20, and the plurality of battery cells 20 may be connected in series, in parallel, or in mixed connection. Mixed connection means that the plurality of battery cells 20 are connected in series and in parallel. The plurality of battery cells 20 can be directly connected in series or in parallel or mixed together, and then the whole composed of the plurality of battery cells 20 can be accommodated in the box 10 ; of course, the battery 100 can also be a plurality of battery cells 20 First, the battery modules are connected in series, parallel, or mixed to form a battery module, and then multiple battery modules are connected in series, parallel, or mixed to form a whole, and are accommodated in the box 10 . The battery 100 may also include other structures. For example, the battery 100 may further include a bus component for realizing electrical connections between multiple battery cells 20 .

Each battery cell 20 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be in the shape of a cylinder, a flat body, a rectangular parallelepiped or other shapes.

Please refer to FIG. 3 , which is an exploded structural diagram of a battery cell 20 provided in some embodiments of the present application. The battery cell 20 refers to the smallest unit that constitutes the battery. As shown in FIG. 3 , the battery cell 20 includes an end cover 21 , a case 22 , an electrode assembly 23 , a connection assembly 24 and other functional components.

The end cap 21 refers to a component that covers the opening of the case 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 21 can be adapted to the shape of the housing 22 to fit the housing 22 . Optionally, the end cap 21 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the end cap 21 is less likely to deform when subjected to extrusion and collision, so that the battery cell 20 can have higher durability. Structural strength and safety performance can also be improved. The end cap 21 may be provided with functional components such as electrode terminals 21a. The electrode terminal 21a may be used to electrically connect with the electrode assembly 23 for outputting or inputting electrical energy of the battery cell 20 . In some embodiments, the end cap 21 may also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The end cap 21 can also be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which are not particularly limited in the embodiment of the present application. In some embodiments, an insulating member may also be provided inside the end cover 21 , and the insulating member may be used to isolate the electrical connection components in the housing 22 from the end cover 21 to reduce the risk of short circuit. For example, the insulating member may be plastic, rubber, etc.

The housing 22 is a component used to cooperate with the end cover 21 to form an internal environment of the battery cell 20 , wherein the formed internal environment can be used to accommodate the electrode assembly 23 , electrolyte, and other components. The housing 22 and the end cover 21 can be independent components, and an opening can be provided on the housing 22, and the end cover 21 covers the opening at the opening to form an opening. into the internal environment of the battery cell 20. Without limitation, the end cover 21 and the housing 22 can also be integrated. Specifically, the end cover 21 and the housing 22 can form a common connection surface before other components are put into the housing. When it is necessary to encapsulate the inside of the housing 22 When, the end cover 21 is closed with the housing 22 again. The housing 22 can be of various shapes and sizes, such as rectangular parallelepiped, cylinder, hexagonal prism, etc. Specifically, the shape of the housing 22 can be determined according to the specific shape and size of the electrode assembly 23 . The housing 22 may be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which are not particularly limited in the embodiment of the present application. The embodiment of the present application takes the shape of the housing 22 as a rectangular parallelepiped as an example.

The electrode assembly 23 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 23 may be contained within the housing 22 . The electrode assembly 23 is mainly formed by winding or stacking a positive electrode piece and a negative electrode piece, and is usually provided with a separator between the positive electrode piece and the negative electrode piece. The separator is used to separate the positive electrode piece and the negative electrode piece to prevent the positive electrode from The pole piece and the negative pole piece are internally short-circuited. The portions of the positive electrode tab and the negative electrode tab that contain active material constitute the main body of the electrode assembly 23 , and the portions of the positive electrode tab and the negative electrode tab that do not contain active material constitute the tabs 23 a respectively. The positive electrode tab and the negative electrode tab can be located together at one end of the main body or respectively located at both ends of the main body. During the charging and discharging process of the battery, the positive active material and the negative active material react with the electrolyte, and the tab 23a is connected to the electrode terminal 21a to form a current loop.

The connection assembly 24 is a component for electrically connecting the tab 23 a of the electrode assembly 23 and the electrode terminal 21 a. The connection assembly 24 includes a connection member 241, one side of the connection member 241 is disposed facing the electrode assembly 23, and the other side of the connection member 241 is disposed away from the electrode assembly 23. The connection member 241 is electrically connected to the tab 23a and the electrode terminal 21a.

According to some embodiments of the present application, refer to Figure 3, and further refer to Figures 4 to 8. Figure 4 is a schematic structural diagram of the connection component 24 provided by some embodiments of the present application, and Figure 5 is a connection component provided by some embodiments of the present application. 24. Figure 6 is a schematic diagram of the assembly of the first insulating layer 2421 and the connector 241 provided by some embodiments of the present application. Figure 7 is an assembly diagram of the second insulating layer 2422 and the connector 241 provided by some embodiments of the present application. Schematic diagram, Figure 8 is a cross-sectional view along the A-A direction of Figure 7 . The present application provides a connection assembly 24 for the battery cell 20 . The connection assembly 24 includes a connection piece 241 and an insulating piece 242 . The connector 241 includes a first connection part 2411 for connecting the tab 23a of the electrode assembly 23, a second connection part 2412 for connecting the electrode terminal 21a, and a first connection part 2411 and the second connection part 2412. In the third connection part 2413, a fuse part 2414 is formed between the first connection part 2411 and the third connection part 2413. The first connection part 2411, the fuse part 2414 and the third connection part 2413 are arranged along the first direction X. The insulating member 242 wraps the fuse part 2414. The insulating member 242 includes a first insulating layer 2421 and a second insulating layer 2422. The first insulating layer 2421 is provided on the side of the connecting member 241 facing the electrode assembly 23, and the second insulating layer 2422 is provided on The side of the connecting member 241 facing away from the electrode assembly 23 . Wherein, along the first direction

In the figure, the direction indicated by the letter X is the first direction, and the first direction The direction indicated by the letter Z is the thickness direction of the connecting member 241 , and the thickness direction Z is perpendicular to the first direction X.

The connector 241 is a component used to realize the electrical connection between the tab 23a of the electrode assembly 23 and the electrode terminal 21a. The connector 241 is a conductive component. For example, the connector 241 can be a metal (such as copper, aluminum, etc.) piece, which has good Conductive properties.

The fuse portion 2414 is a portion of the connector 241 formed between the first connection portion 2411 and the third connection portion 2413 and is used to fuse when the current exceeds a threshold, thereby protecting the battery cell 20 .

The first connecting part 2411, the third connecting part 2413 and the fuse part 2414 of the connecting piece 241 can be located on the same plane, the second connecting part 2412 can protrude from other parts of the connecting piece 241, and the second connecting part 2412 can be circular, Square, cylinder, truncated cone or other shapes that meet the connection requirements. Optionally, the second connecting portion 2412 may be protruded on a side of the connecting member 241 away from the electrode assembly 23 , and correspondingly, may be recessed on a side of the connecting member 241 facing the electrode assembly 23 .

The connector 241 includes a first surface 241a facing the electrode assembly 23 and a second surface 241b away from the electrode assembly 23. The first insulating layer 2421 covers the first surface 241a, and the second insulating layer 2422 covers the second surface 241b. The second connecting portion 2412 forms a convex bulge on the second surface 241b, and correspondingly, the second connecting portion 2412 forms a depression on the second surface 241b.

The insulator 242 is an electrically insulating component to reduce the risk of short circuit. For example, the material of the insulating member 242 may be rubber, plastic, etc.

“The insulating member 242 wraps the fuse part 2414” means that the insulating member 242 is arranged around the circumference of the fuse part 2414. In other words, the fuse part 2414 is circumferentially wrapped by the insulating member 242.

The first insulating layer 2421 and the second insulating layer 2422 are two parts of the insulating member 242. The first insulating layer 2421 is located on the side of the connecting member 241 facing the electrode assembly 23, and the second insulating layer 2422 is located on the side of the connecting member 241 away from the electrode. side of assembly 23.

“The maximum distance H1 from the end of the first insulating layer 2421 away from the first connection part 2411 to the fuse part 2414” refers to, in the first direction X, the edge of the end of the first insulating layer 2421 away from the first connection part 2411 The maximum value of the distance from the fuse portion 2414, for example, when the fuse portion 2414 extends along the second direction Y, the second direction Y is perpendicular to the first direction X and the thickness direction Z of the connector 241, if the first insulating layer The edge of the end of 2421 away from the first connection part 2411 extends along the second direction Y, then the distance from any position of the edge of the end of the first insulation layer 2421 away from the first connection part 2411 to the fuse part 2414 is equal.

In the first direction , by increasing the size of the first insulating layer 2421 in the first direction One side of the electrode assembly 23 has better insulation effect.

"The minimum distance H2 from the second connection part 2412 to the fuse part 2414" refers to the minimum value of the distance between the edge of one end of the second connection part 2412 close to the fuse part 2414 and the fuse part 2414 in the first direction X. .

According to the connecting component 24 of the embodiment of the present application, the first insulating layer 2421 and the second insulating layer 2422 are distributed on opposite sides of the connecting member 241 to increase the coverage area of the insulating member on both sides of the connecting member 241 so that the connecting member 241 It has a good insulation effect. On the one hand, it reduces the risk of the two parts of the connector re-overlapping after the fuse part is blown due to the excessive length of the pole lug. On the other hand, it increases the insulation area and reduces the arcing phenomenon, thereby improving the connection including the The safety of the battery cells 20 of the assembly 24.

According to some embodiments of the present application, as shown in FIG. 6 , along the thickness direction Z of the connecting member 241 , the projection of the first insulating layer 2421 on the connecting member 241 does not overlap with the second connecting portion 2412 .

“The projection of the first insulation layer 2421 on the connector 241 does not overlap with the second connection part 2412” means that along the thickness direction Z, the first insulation layer 2421 does not block the second connection part 2412.

In the above solution, the projection of the first insulating layer 2421 on the connector 241 does not overlap with the second connecting portion 2412, which prevents the first insulating layer 2421 from extending to the formation position of the second connecting portion 2412 when the battery cell 20 is assembled. , to avoid assembly interference with other components and ensure assembly accuracy.

According to some embodiments of the present application, as shown in FIG. 6 , the first insulating layer 2421 includes a first escape portion 2421 a for avoiding the second connection portion 2412 , and the edge of the first escape portion 2421 a surrounds at least one side of the second connection portion 2412 . In part, the minimum distance between the edge of the first escape part 2421a and the edge of the second connection part 2412 is h1, which satisfies 0.5 mm ≤ h1 ≤ 2 mm.

The first escape part 2421a may be a notch or a through hole provided in the first insulation layer 2421 to expose the second connection part 2412.

The edge of the first escape part 2421a refers to the outline of the first insulation layer 2421 at the area where the first escape part 2421a is provided.

"The edge of the first escape part 2421a surrounds at least a part of the second connection part 2412" means that the first escape part 2421a is provided around the second connection part 2412. For example, the first escape part 2421a can be a gap, and the second connection part 2412 Located in the gap, the edge of the first escape part 2421a surrounds a part of the second connection part 2412; alternatively, the first escape part 2421a may be a through hole, the second connection part 2412 is located in the through hole, and the edge of the first escape part 2421a The edge surrounds the entire second connecting portion 2412.

The connecting piece 241 can be a metal piece, and the connecting piece 241 can be stamped. That is, the second connecting part 2412 is a stamped convex part. When the second connecting part 2412 is stamped and formed, the second connecting part 2412 is formed by the connecting piece 241 The side facing the electrode assembly 23 is recessed toward the side of the connector 241 away from the electrode assembly 23. The connector 241 has a deformation area at the formation position of the second connection portion 2412. If the first insulating layer 2421 covers the deformation area , it will cause the first insulating layer 2421 to rise in the deformation area, occupying more installation space, and affecting the assembly of the connecting component 24 and other components; The minimum distance between them meets the above range. On the one hand, the first insulating layer 2421 has a larger area on the side of the connector 241 facing the electrode assembly 23, so that the first insulating layer 2421 has a better insulation effect. On the other hand, The risk of the edge of the first insulating layer 2421 covering the deformation area affecting the assembly accuracy can be reduced, and the assembly accuracy of the connection component 24 and other components can be ensured.

According to some embodiments of the present application, as shown in FIG. 6 , along the extending direction of the edge of the first escape part 2421a, the distance between the edge of the first escape part 2421a and the edge of the second connection part 2412 is equal.

“The distance between the edge of the first escape part 2421a and the edge of the second connection part 2412 is equal” means that in the extending direction of the edge of the first escape part 2421a, any point on the edge of the first escape part 2421a reaches The distance between the edges of the second connecting portion 2412 is equal. In other words, the edge contour of the first escape portion 2421a matches the edge contour of the second connecting portion 2412. For example, the edge contour of the second connecting portion 2412 is circular. , the edge profile of the first escape portion 2421a may be an arc or a circle concentric with the circle. In other embodiments, the edge profile of the first avoiding portion 2421a may be a straight line or a straight line formed by multiple straight lines.

The distance between the edge of the first escape portion 2421a and the edge of the second connecting portion 2412 is equal to ensure that the first insulating layer 2421 can have a larger area to provide a protective layer on the side of the connecting member 241 facing the electrode assembly 23. Has better insulation effect.

According to some embodiments of the present application, along the first direction The maximum distance H3 of the fuse part 2414.

“The maximum distance H3 from the end of the second connection part 2412 away from the fuse part 2414 to the fuse part 2414” refers to, in the first direction the maximum distance between them.

The maximum distance H1 from the end of the first insulating layer 2421 away from the first connection part 2411 to the fuse part 2414 is smaller than the maximum distance H3 from the end of the second connection part 2412 away from the fuse part 2414 to the fuse part 2414. The first insulating layer 2421 is between The end in the first direction X that does not exceed the second connecting portion 2412 away from the fuse portion 2414 reduces the difficulty of processing and forming the first insulating layer 2421 . For example, during the preparation process of the insulating member 242 being injection molded on the connecting member 241 , if the extension size of the first insulating layer 2421 in the first direction The thickness of the end away from the fuse portion 2414 is difficult to control, and the molding of the first insulating layer 2421 is more difficult.

According to some embodiments of the present application, as shown in FIG. 7 , along the thickness direction Z of the connecting member 241 , the projection of the second insulating layer 2422 on the connecting member 241 does not overlap with the second connecting portion 2412 .

“The projection of the second insulation layer 2422 on the connector 241 does not overlap with the second connection part 2412” means that along the thickness direction Z, the second insulation layer 2422 does not block the second connection part 2412.

In the above solution, the projection of the second insulating layer 2422 on the connector 241 does not overlap with the second connecting portion 2412, which prevents the second insulating layer 2422 from extending to the formation position of the second connecting portion 2412 when the battery cell 20 is assembled. , to avoid assembly interference with other components and ensure assembly accuracy.

According to some embodiments of the present application, as shown in FIG. 7 , the second insulating layer 2422 includes a second escape portion 2422a for avoiding the second connection portion 2412 , and the edge of the second escape portion 2422a surrounds at least a portion of the second connection portion 2412 . In part, the minimum distance between the edge of the second escape portion 2422a and the edge of the second connecting portion 2412 is h2, which satisfies 0.5mm≤h2≤2mm.

The second escape part 2422a may be a notch or a through hole provided in the second insulation layer 2422 to expose the second connection part 2412.

The edge of the second relief part 2422a refers to the outline of the second insulation layer 2422 at the area where the second relief part 2422a is provided.

“The edge of the second escape part 2422a surrounds at least a part of the second connection part 2412” means that the second escape part 2422a is provided around the second connection part 2412. For example, the second escape part 2422a can be a gap, and the second connection part 2412 Located in the gap, the edge of the second escape part 2422a surrounds a part of the second connection part 2412; alternatively, the second escape part 2422a may be a through hole, the second connection part 2412 is located in the through hole, and the edge of the second escape part 2422a The edge surrounds the entire second connecting portion 2412.

The connecting piece 241 can be a metal piece, and the connecting piece 241 can be stamped. That is, when the second connecting part 2412 is stamped and formed, the second connecting part 2412 faces from the side of the connecting piece 241 facing the electrode assembly 23 to the side of the connecting piece 241 . The side away from the electrode assembly 23 is recessed, and the connector 241 has a deformed area at the formation position of the second connecting portion 2412. If the second insulating layer 2422 covers the deformed area, the second insulating layer 242 will be formed. 2422 is tilted in this deformation area, occupying more installation space and affecting the assembly of the connecting component 24 and other components; the minimum distance between the edge of the second escape portion 2422a and the edge of the second connecting portion 2412 meets the above range, On the one hand, the second insulating layer 2422 has a larger area on the side of the connector 241 facing the electrode assembly 23, so that the second insulating layer 2422 has a better insulating effect. On the other hand, the second insulating layer 2422 can be reduced. The risk of the edge covering the deformation area and affecting the assembly accuracy ensures the assembly accuracy of the connecting component 24 and other components.

According to some embodiments of the present application, along the extending direction of the edge of the second escape portion 2422a, the distance between the edge of the second escape portion 2422a and the edge of the second connection portion 2412 is equal.

“The distance between the edge of the second escape part 2422a and the edge of the second connection part 2412 is equal” means that in the extending direction of the edge of the second escape part 2422a, any point on the edge of the second escape part 2422a reaches The distances between the edges of the second connecting portion 2412 are all equal. In other words, the edge profile of the second escape portion 2422a matches the edge profile of the second connecting portion 2412. For example, the edge profile of the second connecting portion 2412 is circular. , the edge profile of the second escape portion 2422a may be an arc or a circle concentric with the circle. In other embodiments, the edge profile of the second avoiding portion 2422a may be a straight line or a straight line formed by multiple straight lines.

It should be noted that in the above-mentioned embodiment in which the first insulation layer 2421 includes the first escape portion 2421a and the second insulation layer 2422 includes the second escape portion 2422a, the edge contour of the second escape portion 2422a may be the same as the first escape portion 2422a. The edge profiles of 2421a are the same or different.

According to some embodiments of the present application, as shown in FIG. 7 , along the first direction The minimum distance H2 of part 2414.

“The maximum distance H4 from the end of the second insulating layer 2422 away from the first connection part 2411 to the fuse part 2414” refers to, in the first direction X, the edge of the end of the second insulating layer 2422 away from the first connection part 2411 The maximum value of the distance from the fuse part 2414. For example, when the fuse part 2414 extends along the second direction Y, if the edge of one end of the second insulating layer 2422 away from the first connection part 2411 extends along the second direction, then the The distance from any position of the edge of one end of the two insulating layers 2422 away from the first connecting portion 2411 to the fuse portion 2414 is equal.

In the above solution, the second insulating layer 2422 exceeds the end of the second connecting portion 2412 close to the fuse portion 2414 in the first direction X, so that the second insulating layer 2422 has a larger area and has a better insulation effect.

According to some embodiments of the present application, as shown in FIG. 7 , along the first direction The maximum distance H3 from one end of the fuse portion 2414 to the fuse portion 2414 .

In the above solution, the maximum distance H4 from the end of the second insulating layer 2422 away from the first connection part 2411 to the fuse part 2414 is less than the maximum distance H3 from the end of the second connection part 2412 away from the fuse part 2414 to the fuse part 2414. The second insulating layer 2422 does not exceed the fuse portion 2414 in the first direction X, which reduces the difficulty of processing and forming the second insulating layer 2422. For example, during the preparation process of injection molding of the insulating member 242 on the connecting member 241 , if the extension size of the second insulating layer 2422 in the first direction The thickness of the end away from the fuse portion 2414 is difficult to control, and the molding of the second insulating layer 2422 is relatively difficult.

According to some embodiments of the present application, as shown in FIG. 5 , the insulating member 242 further includes two fourth connections. portion 2423, and the two fourth connecting portions 2423 respectively cover at least part of the two opposite edges of the connecting member 241 along the second direction Y. The second direction Y is perpendicular to the first direction X and the thickness direction Z of the connecting member 241. The first insulation layer 2421 and the second insulation layer 2422 are connected through two fourth connection parts 2423.

“The two fourth connecting parts 2423 respectively cover at least part of the two opposite edges of the connecting member 241 along the second direction Y” means that along the first direction At least part of the edge in the two directions Y, the fourth connecting portion 2423 at least surrounds the fuse portion 2414, and the size of the fourth connecting portion 2423 in the first direction X is the same as the size of the first insulating layer 2421 in the first direction X.

Two fourth connecting parts 2423 are located on opposite sides of the connecting member 241 along the second direction Y. The first insulating layer 2421 and the second insulating layer 2422 are connected through the two fourth connecting parts 2423, so that the first insulating layer 2421, The second insulation layer 2422 and the two fourth connection parts 2423 wrap the fuse part 2414.

In the above solution, the first insulating layer 2421 and the second insulating layer 2422 are connected through the fourth connecting part 2423 to ensure the connection strength between the insulating member 242 and the connecting member 241.

Please refer to Figure 5, and further refer to Figures 6 and 9. Figure 9 is a cross-sectional view along the B-B direction of Figure 6. According to some embodiments of the present application, the third connection part 2413 is provided with a channel 2413a, and the insulating member 242 also includes a fifth connection part 2424. The fifth connection part 2424 fills the channel 2413a and connects the first insulating layer 2421 and the second insulating layer 2422. .

The channel 2413a refers to an area on the third connecting part 2413 and passes through the third connecting part 2413 in the thickness direction Z. The channel 2413a connects two opposite surfaces of the third connecting part 2413 in the thickness direction Z.

Alternatively, channel 2413a may be a through hole. When the channel 2413a is a through hole, the through hole may be a stepped hole, or, along the thickness direction Z, the cross-sectional area of the through hole is equal from the side of the connector facing the electrode assembly to the side away from the electrode assembly. The cross-section of the through hole can be of any shape, such as circular, rectangular, triangular, special-shaped, etc.

It should be noted that the number of channels 2413a may be one or multiple. When the number of channels 2413a is multiple, the multiple channels 2413a may be spaced apart along the second direction Y. Optionally, the number of channels 2413a is two, and the two channels 2413a are spaced apart along the second direction Y.

The fifth connecting portion 2424 is a portion of the insulating member 242 used to connect the first insulating layer 2421 and the second insulating layer 2422 . "The fifth connection part 2424 fills the channel 2413a" means that the surface of the fifth connection part 2424 is in contact with the surface of the channel 2413a.

In the above solution, the channel 2413a is provided to facilitate the accommodation of the fifth connecting part 2424, so that the fifth connecting part 2424 connects the first insulating layer 2421 and the second insulating layer 2422, ensuring a stable connection between the insulating member 242 and the connecting member 241. .

Please refer to Figure 5, and further refer to Figures 7 and 10. Figure 10 is a cross-sectional view along the C-C direction of Figure 7. According to some embodiments of the present application, the connecting member 241 has a notch 2414a. The notch 2414a is located on at least one side of the fuse portion 2414 along the second direction Y. The second direction Y is perpendicular to the first direction X and the thickness direction Z of the connecting member 241. , the insulating member 242 further includes a sixth connecting portion 2425, which fills the gap 2414a and connects the first insulating layer 2421 and the second insulating layer 2422.

The notch 2414a refers to the area provided on the connecting member 241 and penetrating the connecting member 241 along the thickness direction Z. The notch 2414a is located at the edge of the fuse portion 2414 along the second direction Y.

The insulating member 242 may be an annular structure to wrap the fuse part 2414; the sixth connecting part 2425 is a structure provided on the inner wall of the insulating part 242, and the sixth connecting part 2425 may connect the first insulating layer 2421 and the second insulating layer 2422.

“The sixth connecting part 2425 fills the gap 2414a” means that the surface of the sixth connecting part 2425 is in contact with the surface of the gap 2414a.

In the above solution, the gap 2414a formed on the connector 241 reduces the flow area here, which can play a safety role; the sixth connection part 2425 fills the gap 2414a, and the sixth connection part 2425 is connected to the first insulating layer 2421 and the second insulating layer 2422 make the connection between the insulating member 242 and the connecting member 241 stable and have a better insulation and isolation effect.

According to some embodiments of the present application, the insulating member 242 is injection molded on the connecting member 241 .

"The insulating member 242 is injection molded on the connecting member 241" means that the insulating member 242 is formed by solidifying molten plastic on the connecting member 241, so that the insulating member 242 wraps the fuse portion 2414.

In an embodiment in which the third connecting part 2413 is provided with a channel 2413a, the channel 2413a may be a channel for the flow of molten plastic. During the injection molding process of the insulating member 242 on the connecting member 241, the connecting member 241 is placed in the mold. Inject molten plastic into the mold, and the molten plastic flows to the bottom of the connector 241 through the channel 2413a to form a first insulating layer 2421 below the connector 241 and a second insulating layer 2422 above the connector 241. A fifth connecting portion 2424 is formed in the channel 2413a; at the same time, two fourth connecting portions 2423 can be formed on both sides of the connecting member 241 in the second direction Y, so that the two fourth connecting portions 2423 are connected to the first insulating layer 2421 and second insulating layer 2422.

In the above solution, the insulating member 242 is injection molded on the connecting member 241 to facilitate processing and manufacturing, and the insulating member 242 and the connecting member 241 are connected stably.

According to some embodiments of the present application, the present application also provides a battery cell 20, which includes a casing, an electrode assembly 23, an electrode terminal 21a and the connection assembly 24 described in any of the above solutions. The housing includes a wall part; the electrode assembly 23 is disposed in the housing; the electrode terminal 21a is disposed on the wall part; the first connection part 2411 is connected to the tab 23a of the electrode assembly 23, and the second connection part 2412 is connected to the electrode terminal 21a.

The housing may include an end cover 21 and a housing 22 , and the wall part may be the end cover 21 , or the wall part may also be the wall of the housing 22 .

According to some embodiments of the present application, the present application also provides a battery 100, which includes the battery cell 20 described in any of the above solutions.

According to some embodiments of the present application, the present application also provides an electrical device, which includes the battery 100 described in any of the above solutions. The battery 100 is used to provide electrical energy for the electrical device.

The powered device may be any of the aforementioned devices or systems using the battery 100 .

According to some embodiments of the present application, referring to FIGS. 3 to 10 , the present application provides a connection assembly 24 for the battery cell 20 . The connection assembly 24 includes a connection piece 241 and an insulating piece 242 . The connector 241 includes a first connection part 2411 for connecting the tab 23a of the electrode assembly 23, a second connection part 2412 for connecting the electrode terminal 21a, and a first connection part 2411 and the second connection part 2412. The third connection part 2413 has a fuse part 2414 formed between the first connection part 2411 and the third connection part 2413. The first connection part 2411, the fuse part 2414 and the third connection part 2413 are arranged along the first direction X. The insulating member 242 wraps the fuse part 2414. Insulation parts 242 includes a first insulating layer 2421, a second insulating layer 2422 and two fourth connecting parts 2423. The first insulating layer 2421 is provided on the side of the connecting member 241 facing the electrode assembly 23, and the second insulating layer 2422 is provided on the connecting member 242. On the side of 241 away from the electrode assembly 23, two fourth connecting portions 2423 cover at least a portion of two opposite edges of the connecting member 241 along the second direction Y, and the two fourth connecting portions 2423 connect the first insulating layer 2421 and second insulating layer 2422. Along the first direction The maximum distance H4 from the end of the second insulating layer 2422 away from the first connection part 2411 to the fuse part 2414 is greater than the minimum distance H2 from the end of the second connection part 2412 close to the fuse part 2414 to the fuse part 2414 . The insulating component 242 is injection molded on the connecting component 241 .

According to the connection assembly 24 of the embodiment of the present application, both the first insulation layer 2421 and the second insulation layer 2422 exceed the second connection part 2412 in the first direction X, so that the first insulation layer 2421 faces the electrode assembly 23 on the side of the connection member 241 One side has a larger area to enhance the insulation effect of the insulating member 242 on the side of the connecting member 241 facing the electrode assembly 23. At the same time, the fourth connecting portion 2423 connects the first insulating layer 2421 and the second insulating layer 2422, so that The connection between the insulating member 242 and the connecting member 241 is stable, and the insulating member 242 has a good insulation effect. The connection component 24 is applied to the battery cell 20 and can improve the safety of the battery cell 20 .

While the present application has been described with reference to preferred embodiments, various modifications may be made and equivalents may be substituted for components thereof without departing from the scope of the application. In particular, as long as there is no structural conflict, the technical features mentioned in the various embodiments can be combined in any way. The application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims (16)

1. A connection assembly for battery cells, including:

   The connector includes a first connection part for connecting the tabs of the electrode assembly, a second connection part for connecting the electrode terminal, and a third connection part for connecting the first connection part and the second connection part. , a fuse portion is formed between the first connection portion and the third connection portion, and the first connection portion, the fuse portion and the third connection portion are arranged along the first direction;

   An insulating member wraps the fuse part. The insulating member includes a first insulating layer and a second insulating layer. The first insulating layer is provided on the side of the connecting member facing the electrode assembly. The second insulating member The insulating layer is disposed on a side of the connector facing away from the electrode assembly;

   Wherein, along the first direction, a maximum distance from an end of the first insulating layer away from the first connection part to the fuse part is greater than a minimum distance from the second connection part to the fuse part.
2. The connection assembly according to claim 1, wherein the projection of the first insulating layer on the connection piece does not overlap with the second connection part along the thickness direction of the connection piece.
3. The connection assembly according to claim 2, wherein the first insulation layer includes a first escape portion for avoiding the second connection portion, and an edge of the first escape portion surrounds an edge of the second connection portion. At least part of the way, the minimum distance between the edge of the first escape part and the edge of the second connection part is h1, satisfying 0.5mm≤h1≤2mm.
4. The connection assembly according to claim 3, wherein along the extending direction of the edge of the first escape portion, the distance between the edge of the first escape portion and the edge of the second connection portion is equal.
5. The connection assembly according to any one of claims 1 to 4, wherein along the first direction, a maximum distance from an end of the first insulation layer away from the first connection part to the fuse part is less than The maximum distance from an end of the second connection part away from the fuse part to the fuse part.
6. The connection assembly according to any one of claims 1 to 5, wherein the projection of the second insulating layer on the connection part does not overlap with the second connection part along the thickness direction of the connection part. .
7. The connection assembly according to any one of claims 1 to 6, wherein the second insulation layer includes a second escape portion for avoiding the second connection portion, and an edge of the second escape portion surrounds the second connection portion. For at least a part of the second connection part, the minimum distance between the edge of the second escape part and the edge of the second connection part is h2, satisfying 0.5mm≤h2≤2mm.
8. The connection assembly according to any one of claims 1 to 7, wherein along the first direction, a maximum distance from an end of the second insulating layer away from the first connection part to the fuse part is greater than The minimum distance from the second connecting part to the fuse part.
9. The connection assembly according to any one of claims 1 to 8, wherein along the first direction, a maximum distance from an end of the second insulating layer away from the first connection part to the fuse part is less than The maximum distance from an end of the second connection part away from the fuse part to the fuse part.
10. The connection assembly according to any one of claims 1 to 9, wherein the insulation member further includes two fourth connection parts, the two fourth connection parts respectively cover the second edge of the connection member along the second At least part of the two edges with opposite directions, the second direction is perpendicular to the first direction and the thickness direction of the connecting piece, the first The insulating layer and the second insulating layer are connected through the two fourth connection parts.
11. The connection assembly according to any one of claims 1-10, wherein the third connection part is provided with a channel, the insulating member further includes a fifth connection part, the fifth connection part fills the channel and Connect the first insulation layer and the second insulation layer.
12. The connection assembly according to any one of claims 1 to 11, wherein the connection piece has a notch, the notch is located on at least one side of the fuse part along a second direction, and the second direction is perpendicular to In the first direction and the thickness direction of the connecting member, the insulating member further includes a sixth connecting portion, the sixth connecting portion fills the gap and connects the first insulating layer and the second insulating layer. .
13. The connection assembly according to any one of claims 1-12, wherein the insulating part is injection molded on the connection part.
14. A battery cell including:

    Shell, including walls;

    An electrode assembly is provided in the housing;

    Electrode terminals are provided on the wall;

    The connection assembly according to any one of claims 1 to 13, wherein the first connection part is connected to the tab of the electrode assembly, and the second connection part is connected to the electrode terminal.
15. A battery including the battery cell according to claim 14.
16. An electrical device including the battery as claimed in claim 15.