Battery cell, support member, battery device, and electric device

Abstract

The embodiment of the utility model provides a battery monomer, a supporting piece, a battery device and a power utilization device, and belongs to the technical field of batteries. The battery cell includes: a housing; the electrode assembly, the support and the insulating part are all arranged in the shell, and the support and the insulating part are located at the two ends of the electrode assembly in the first direction respectively; the supporting piece is attached to at least one side of the electrode assembly in the second direction, the two ends of the supporting piece are in hot melting connection with the side wall of the support and the side wall of the insulating piece respectively, a first weld mark is formed at the joint of the supporting piece and the support, and a second weld mark is formed at the joint of the supporting piece and the insulating piece; at least one of the first weld mark and the second weld mark extends to the edge of the corresponding end of the supporting piece, and the first direction intersects with the second direction. By using the structure, the welding strength of the weak connecting end of the supporting piece is improved, the welding area of the two ends of the supporting piece is balanced, the hot melting fixing quality and reliability of the supporting piece are improved, the risk that the supporting piece is loosened and falls off is reduced, and the stability and reliability of the single battery are improved.

Description

Technical Field

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

[0002] In related technologies, some battery cells use a bracket to gather the positive and negative electrodes to one side, while an explosion-proof valve is installed on the opposite side, and electrical isolation is achieved through an insulating component. Support components are widely used to support and protect the electrode assembly, with their two ends thermally fused to the bracket and the insulating component, respectively. However, due to the significant height difference between the bracket and the insulating component, the traditional method of evenly distributing through holes at both ends of the support component results in an excessively small thermal fusion area at one end. This affects the strength of the thermal fusion connection, increases the risk of the support component detaching, and consequently impacts the overall performance and reliability of the battery cell. Utility Model Content

[0003] This application provides a battery cell, a support member, a battery device, and an electrical device to improve the quality and reliability of the support member's heat-fusion fixation, thereby reducing the risk of the support member loosening and falling off.

[0004] In a first aspect, embodiments of this application provide a single battery cell, comprising:

[0005] shell;

[0006] The electrode assembly, the support, and the insulating component are all disposed within the housing, with the support and the insulating component located at both ends of the electrode assembly along the first direction, respectively.

[0007] A support member is attached to at least one side of the electrode assembly along a second direction, and both ends are thermally fused to the sidewalls of the bracket and the insulating member, respectively. A first weld line is formed at the connection between the support member and the bracket, and a second weld line is formed at the connection between the support member and the insulating member. At least one of the first weld line and the second weld line extends to the edge of the corresponding end of the support member. The first direction intersects the second direction.

[0008] In the above technical solution, by extending at least one of the first and second weld lines to the edge of the corresponding end of the support member, the connection end corresponding to the shorter one of the bracket and the insulating member can have a larger heat fusion area, which effectively improves the welding strength of the weak connection end of the support member, balances the welding area at both ends of the support member, improves the quality and reliability of the heat fusion fixation of the support member, thereby greatly reducing the risk of the support member loosening and falling off, and thus improving the stability and reliability of the battery cell.

[0009] In some embodiments, both the first weld line and the second weld line are spaced apart from the electrode assembly along the first direction.

[0010] In some embodiments, the distance h1 between the first weld line and the electrode assembly, and the distance h2 between the second weld line and the electrode assembly, satisfy:

[0011] 0mm

[0012] In some embodiments, the first weld line and / or the second weld line includes a first portion located on the support and a second portion extending beyond the support, wherein the width W1 of the first portion and the width W2 of the second portion satisfy: 1mm ≤ W1 ≤ 2.5mm, 0mm <W2≤1mm。

[0013] In some embodiments, the distance between the outer side of the bracket and the outer side of the insulating member is greater than the length of the support member.

[0014] In some embodiments, the first weld line is spaced apart from the end face of the corresponding end of the support member, and the second weld line extends to the edge of the corresponding end of the support member.

[0015] In the above technical solution, by setting only the second weld line extending to the edge of the corresponding end of the support member, the second part extending from the second weld line can increase the connection area between the support member and the insulating member, make up for the insufficient connection caused by the height difference, thereby balancing the connection strength at both ends of the support member and improving the overall structural stability of the battery cell.

[0016] In some embodiments, both the first weld line and the second weld line extend to the edge of their respective ends of the support member.

[0017] In the above technical solution, by extending the first weld line and the second weld line to the edge of the corresponding end of the support, the connection area between the support, the bracket and the insulating part is greatly increased, the welding strength at both ends of the support is comprehensively improved, and the hot melting area of ​​the support coincides with the bracket to the maximum extent. At the same time, the required length of the support can be reduced, thereby reducing material costs and thus reducing the production cost of the entire battery cell.

[0018] ​Secondly, embodiments of this application provide a support member applied to a battery cell as described in any of the above schemes. One end of the support member along the first direction is provided with a first hot-melt structure for hot-melt connection with the bracket of the battery cell, and the other end along the first direction is provided with a second hot-melt structure for hot-melt connection with the insulating part of the battery cell. Both the first hot-melt structure and the second hot-melt structure penetrate the support member along the second direction, and at least one of the first hot-melt structure and the second hot-melt structure is a notch adapted to be open at the edge of the corresponding end.

[0019] In the above technical solution, by having at least one of the first and second hot-melt structures as a notch suitable for being opened at the edge of the corresponding end, a structural basis is provided for at least one of the first and second weld lines to extend to the edge of the corresponding end of the support after hot melting. This allows the connection end corresponding to the shorter one of the bracket and the insulating component to have a larger hot-melt area, effectively improving the welding strength of the weak connection end of the support, balancing the welding area at both ends of the support, and improving the quality and reliability of the hot-melt fixation of the support. This significantly reduces the risk of the support loosening and falling off, thereby improving the stability and reliability of the battery cell.

[0020] In some embodiments, the first hot-melt structure is a through hole, and the second hot-melt structure is a notch.

[0021] In some embodiments, both the first hot-melt structure and the second hot-melt structure are notches.

[0022] Thirdly, embodiments of this application provide a battery device, including: a plurality of battery cells as described above.

[0023] Fourthly, embodiments of this application provide an electrical device, including: a battery cell as described above or a battery device as described above, wherein the battery cell or the battery device is used to store or provide electrical energy. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0026] Figure 2 Exploded views of the structure of the battery device provided in some embodiments of this application;

[0027] Figure 3 This is a partial structural schematic diagram of a battery cell provided in some embodiments of this application;

[0028] Figure 4 This is one of the schematic diagrams of the heat fusion of the support and bracket provided in some embodiments of this application;

[0029] Figure 5 This is one of the schematic diagrams of the heat fusion of the support and insulating parts provided in some embodiments of this application;

[0030] Figure 6 This is one of the structural schematic diagrams of the support member provided in some embodiments of this application;

[0031] Figure 7 This is the second schematic diagram of the heat fusion of the support and bracket provided in some embodiments of this application;

[0032] Figure 8 This is the second schematic diagram of the heat fusion of the support and insulating components provided in some embodiments of this application;

[0033] Figure 9 This is a second schematic diagram of the structure of the support member provided in some embodiments of this application.

[0034] Figure label:

[0035] 1000 vehicles;

[0036] Battery device 100;

[0037] Box 10, first box body 11, second box body 12;

[0038] Battery cell 20, first weld line 201a, second weld line 201b, first part 2011, second part 2012;

[0039] 21. Housing 21, electrode assembly 22, bracket 23, insulating component 24;

[0040] Support member 25, first hot melt structure 251, second hot melt structure 252;

[0041] Controller 200; Motor 300. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0043] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0044] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0045] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0046] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0047] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0048] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0049] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0050] Battery cells can be cylindrical, flat, cuboid, or other shapes, and this application embodiment is not limited to any of these. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and this application embodiment is not limited to any of these types either.

[0051] A battery cell includes a casing, electrode components, and electrolyte. The casing houses the electrode components and electrolyte. The electrode components consist of a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrode components. The positive electrode includes a positive current collector and a positive active material layer. The positive current collector includes a current collector body and a positive electrode tab. The positive active material layer is coated on the surface of the current collector body, while the positive electrode tab is not coated with the positive active material layer and protrudes from the current collector body. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer. The negative current collector includes a current collector body and a negative electrode tab. The negative active material layer is coated on the surface of the current collector body, while the negative electrode tab is not coated with the negative active material layer and protrudes from the current collector body. The negative electrode current collector can be made of copper, and the negative electrode active material can be carbon or silicon, etc. To ensure that a large current can be passed without melting, there are multiple positive electrode tabs stacked together, and there are multiple negative electrode tabs stacked together.

[0052] The separator can be made of PP (polypropylene) or PE (polyethylene), etc. Furthermore, the electrode assembly can be a wound structure or a stacked structure; the embodiments of this application are not limited to these.

[0053] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft, including aircraft, rockets, space shuttles, and spacecraft. Individual battery cells are used to store or provide electrical energy.

[0054] The inventors discovered that in related technologies, some battery cells use a bracket to gather the positive and negative electrodes to one side, while an explosion-proof valve is installed on the opposite side, and electrical isolation is achieved through an insulating component. A support component is widely used to support and protect the electrode assembly, with its two ends thermally fused to the bracket and the insulating component, respectively. However, due to the significant height difference between the bracket and the insulating component in the aforementioned structure, conventional thermal fusion methods result in excessively different thermal fusion area differences at both ends of the support component. For example, the height of the insulating component is usually smaller than the height of the bracket, which makes the area available for the thermal fusion head to process too narrow when connecting the support component and the insulating component. This affects the quality of the thermal fusion connection, easily leading to the support component loosening and falling off, thus affecting the reliability and lifespan of the battery cell.

[0055] Based on the above considerations, in order to solve the problem that the difference in the area of ​​the hot-melt region at both ends of the support member is too large due to the different heights of the bracket and the insulator, thus affecting the quality of the hot-melt connection, the inventors, after in-depth research, designed a battery cell including: a shell, an electrode assembly, a bracket, an insulator, and a support member. The electrode assembly, the bracket, and the insulator are all disposed inside the shell, and the bracket and the insulator are respectively located at both ends of the electrode assembly along a first direction. The support member is attached to at least one side of the electrode assembly along a second direction, and both ends are hot-melt connected to the sidewalls of the bracket and the insulator, respectively. A first weld line is formed at the connection between the support member and the bracket, and a second weld line is formed at the connection between the support member and the insulator. At least one of the first weld line and the second weld line extends to the edge of the corresponding end of the support member, and the first direction intersects the second direction.

[0056] In this type of battery cell, by setting at least one of the first and second weld lines to extend to the edge of the corresponding end of the support, the connection end corresponding to the shorter of the bracket and the insulator can have a larger heat fusion area. This effectively balances the heat fusion connection area at both ends of the support, improves the quality and reliability of the heat fusion connection, reduces the risk of the support loosening and falling off, and thus improves the stability and reliability of the battery cell.

[0057] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0058] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0059] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0060] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0061] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing by fixing the battery module in the housing.

[0062] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0063] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0064] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0065] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0066] This application provides an electrical device that uses a single battery cell or battery pack as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, and spacecraft. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft.

[0067] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0068] Please refer to Figure 1 , Figure 1This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. A battery device 100 is installed inside the vehicle, and the battery device 100 can be located at the bottom, front, or rear of the vehicle. The battery device 100 can be used to power the vehicle; for example, the battery device 100 can serve as the vehicle's operating power source. The vehicle may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle during starting, navigation, and driving.

[0069] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle, but also as the driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0070] Please refer to Figure 2 , Figure 2 This is an exploded view of the structure of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a housing 10 and a plurality of battery cells 20, which are housed within the housing 10. The housing 10 provides assembly space for the battery cells 20, and the housing 10 can adopt various structures. In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, which overlap each other, and together define an assembly space for accommodating the battery cells 20. The second housing body 12 may be a hollow structure open at one end, and the first housing body 11 may be a plate-like structure, with the first housing body 11 covering the open side of the second housing body 12, so that the first housing body 11 and the second housing body 12 together define the assembly space; alternatively, the first housing body 11 and the second housing body 12 may both be hollow structures open on one side, with the open side of the first housing body 11 covering the open side of the second housing body 12. Of course, the box 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as cylinder, cuboid, etc.

[0071] In the battery device 100, multiple battery cells 20 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, parallel, or in a mixed configuration to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is then housed within the housing 10. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 20.

[0072] Please refer to Figure 2 The battery device 100 includes multiple rows of battery cells 20, which are arranged along a first direction. Each row of battery cells 20 includes multiple battery cells 20 arranged along a second direction. The first direction and the second direction are the length direction and the width direction of the housing 10, respectively, and the first direction and the second direction are perpendicular to each other.

[0073] The technical solutions described in this application can also be applied to various energy storage devices that use individual battery cells or battery devices. These energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems, etc. Energy storage devices can store electrical energy as needed and output it when appropriate. For example, an energy storage device can store electrical energy during off-peak hours and provide power to relevant users or electrical devices during peak hours.

[0074] Unless otherwise specified, refer to Figure 3 In this embodiment of the application, the first direction is the length direction of the battery cell 20, which is the X direction in the figure. In this embodiment of the application, the second direction is the width direction of the battery cell 20, which is the Y direction in the figure. In this embodiment of the application, the third direction is the thickness direction of the battery cell 20, which is the Z direction in the figure.

[0075] According to some embodiments of this application, refer to Figures 3-5 , Figure 7 and Figure 8As shown, this application provides a battery cell 20, including: a housing 21, an electrode assembly 22, a bracket 23, an insulator 24, and a support member 25. The electrode assembly 22, the bracket 23, and the insulator 24 are all disposed inside the housing 21, and the bracket 23 and the insulator 24 are respectively located at both ends of the electrode assembly 22 along a first direction. The support member 25 is attached to at least one side of the electrode assembly 22 along a second direction, and its two ends are respectively thermally fused to the sidewalls of the bracket 23 and the insulator 24. A first weld line 201a is formed at the connection between the support member 25 and the bracket 23, and a second weld line 201b is formed at the connection between the support member 25 and the insulator 24. At least one of the first weld line 201a and the second weld line 201b extends to the edge of the corresponding end of the support member 25, and the first direction intersects the second direction.

[0076] For example, refer to Figure 3 The bracket 23 is used to bring out the tabs of the electrode assembly 22. The two narrow sides of the electrode assembly 22 are equipped with support members 25 to support and protect the electrode assembly 22 as it is gradually inserted into the housing 21 along the first direction. The length direction of the support member 25 is parallel to the first direction, and both ends of the support member 25 extend out of the electrode assembly 22 to be fixedly connected to the bracket 23 and the insulating member 24.

[0077] In actual execution, the two support members 25 can be attached to the two narrow sides of the electrode assembly 22 first, and the support members 25 and the electrode assembly 22 can be initially bound and fixed using straps or other tools. Then, the bracket 23 and the insulating member 24 can be assembled to the two ends of the electrode assembly 22 respectively, and the target hot-melt area of ​​the support member 25, the bracket 23 and the insulating member 24 can be heated and pressurized using a hot-melt head. After the molten material solidifies, the target hot-melt area at both ends of the support member 25 will form the first weld line 201a and the second weld line 201b respectively.

[0078] In this embodiment, refer to Figure 4 and further refer to Figure 5 The first weld line 201a is located within the coverage area of ​​the support member 25, and the second weld line 201b extends to the edge of the end where the support member 25 is connected to the insulator 24.

[0079] In other embodiments, reference is made to... Figure 7 and further refer to Figure 8 The first weld line 201a extends to the edge of the end where the support 25 is connected to the bracket 23, and the second weld line 201b extends to the edge of the end where the support 25 is connected to the insulator 24.

[0080] In some other embodiments, the first weld line 201a extends to the edge of the end where the support 25 is connected to the bracket 23, and the second weld line 201b is located within the coverage area of ​​the support 25.

[0081] Understandably, referring to Figure 3 Since the tabs of the electrode assembly 22 are all led out from the top, the support 23 is located at the top of the electrode assembly 22, and the insulator 24 is located at the bottom of the electrode assembly 22. The support 23 needs to be tall enough to close the tabs of the electrode assembly 22. To match the electrode assembly 22 with protruding tabs, the height of the support 23 at the top needs to be greater than the height of the insulator 24 at the bottom. In this case, at least the second weld line 201b is set to extend to the edge of the end where the support 25 is connected to the insulator 24. This can at least increase the area of ​​the weldable region of the support 25 and the insulator 24, increase the distribution area of ​​the second weld line 201b formed after heat fusion, balance the heat fusion connection area at both ends of the support 25, improve the quality and reliability of the heat fusion connection, thereby reducing the risk of the support 25 loosening and falling off, and thus improving the stability and reliability of the battery cell 20.

[0082] The battery cell 20 provided in this application embodiment, through the structural design of at least one of the first weld line 201a and the second weld line 201b extending to the edge of the corresponding end of the support member 25, allows the connection end corresponding to the shorter one of the bracket 23 and the insulating member 24 to have a larger heat fusion area. This effectively improves the welding strength of the weak connection end of the support member 25, balances the welding area at both ends of the support member 25, and improves the quality and reliability of the heat fusion fixation of the support member 25. This significantly reduces the risk of the support member 25 loosening and falling off, thereby improving the stability and reliability of the battery cell 20.

[0083] According to some embodiments of this application, refer to Figure 4 , Figure 5 , Figure 7 and Figure 8 As shown, the first weld line 201a and the second weld line 201b are both spaced apart from the electrode assembly 22 along the first direction.

[0084] Understandably, during the manufacturing process of the battery cell 20, the support 25, bracket 23, and insulating component 24 are joined by thermal fusion to form a first weld line 201a and a second weld line 201b. This thermal fusion process generates heat. If the first weld line 201a and / or the second weld line 201b come into contact with the electrode assembly 22, the heat may be conducted to the electrode assembly 22, potentially causing burns. As the core component of the battery cell 20 for energy storage and release, the performance and stability of the electrode assembly 22 directly affect the overall performance of the battery cell 20. Burns to the electrode assembly 22 may lead to a decrease in the performance of the electrode materials, such as changes in the structure of the active material, affecting the efficiency and reversibility of its electrochemical reaction; or decreased electrode conductivity, increased battery internal resistance, and reduced charge / discharge performance. Since the first weld line 201a and the second weld line 201b are both spaced apart from the electrode assembly 22 along the first direction in this embodiment, the heat conduction to the electrode assembly 22 during the hot melting process can be effectively reduced. This can significantly reduce the direct thermal damage to the electrode assembly 22 caused by the high temperature during the hot melting process, thereby protecting the performance and structural integrity of the electrode assembly 22 and improving the yield of the entire production line.

[0085] The battery cell 20 provided in this application embodiment can effectively reduce the conduction of heat to the electrode assembly 22 during the hot melting process by separating the first weld line 201a and the second weld line 201b from the electrode assembly 22 as described above. This significantly reduces the risk of direct damage to the electrode assembly 22 caused by the high temperature during the hot melting process, thereby protecting the performance and structural integrity of the electrode assembly 22 and improving the yield of the entire production line.

[0086] According to some embodiments of this application, refer to Figure 4 , Figure 5 , Figure 7 and Figure 8 As shown, the distance h1 between the first weld line 201a and the electrode assembly 22, and the distance h2 between the second weld line 201b and the electrode assembly 22, satisfy the following:

[0087] 0mm

[0088] Specifically, the distance h1 between the first weld line 201a and the electrode assembly 22 can be 0.224mm, 0.75mm, 1mm, 1.5mm, 1.7857mm, 2mm, or other values ​​between 0mm and 2mm; the distance h2 between the second weld line 201b and the electrode assembly 22 can be 0.224mm, 0.75mm, 1mm, 1.5mm, 1.7857mm, 2mm, or other values ​​between 0mm and 2mm. This application embodiment does not limit this.​

[0089] As an example, the distance h1 between the first weld line 201a and the electrode assembly 22 is 1mm to 2mm, and the distance h2 between the second weld line 201b and the electrode assembly 22 is also 1mm to 2mm.

[0090] In this case, the distance h1 between the first weld line 201a and the electrode assembly 22 can be 1 mm, 1.256 mm, 1.5 mm, 1.75 mm, 2 mm, or other values ​​between 1 mm and 2 mm; the distance h2 between the second weld line 201b and the electrode assembly 22 can be 1 mm, 1.256 mm, 1.5 mm, 1.75 mm, 2 mm, or other values ​​between 1 mm and 2 mm. This application embodiment does not limit this.

[0091] The battery cell 20 provided in this application embodiment, by limiting the range of h1 and h2 as described above, can effectively reduce the conduction of heat to the electrode assembly 22 during the hot melting process, while avoiding space waste caused by excessive distance as much as possible, thus achieving a balance between thermal protection effect and space utilization.

[0092] According to some embodiments of this application, refer to Figure 5 , Figure 7 and Figure 8 As shown, the first weld line 201a and / or the second weld line 201b includes a first portion 2011 located on the support member 25 and a second portion 2012 extending beyond the support member 25. The width W1 of the first portion 2011 and the width W2 of the second portion 2012 satisfy: 1mm ≤ W1 ≤ 2.5mm, 0mm <W2≤1mm。

[0093] The first part 2011 is distributed within the coverage area of ​​the support member 25, and the first part 2011 directly heat-melts the support member 25 with the bracket 23 or the insulating member 24.

[0094] The second part 2012 extends beyond the coverage of the support 25 to further enhance the strength of the weld, so that the support 25 is more tightly bonded to the bracket 23 or the insulator 24, while providing additional mechanical support.

[0095] Specifically, the width W1 of the first part 2011 can be 1mm, 1.25mm, 1.5mm, 2mm, 2.357mm, 2.5mm, or other values ​​between 1mm and 2.5mm; the width W2 of the second part 2012 can be 0.268mm, 0.5mm, 0.86mm, 0.9646mm, 1mm, or other values ​​between 0mm and 1mm. This application embodiment does not impose any restrictions on this.

[0096] As an example, the width W1 of the first part 2011 is 1.5mm to 2mm, and the width W2 of the second part 2012 is 0.2mm to 0.8mm.

[0097] In this case, the width W1 of the first part 2011 can be 1.5mm, 1.637mm, 1.75mm, 1.9548mm, 2mm or other values ​​between 1.5mm and 2mm; the width W2 of the second part 2012 can be 0.2mm, 0.437mm, 0.5mm, 0.76mm, 0.8mm or other values ​​between 0.2mm and 0.8mm, and this application embodiment does not limit this.

[0098] The battery cell 20 provided in this application embodiment, by limiting the range of W1 and W2 as described above, enables the weld line extending to the corresponding edge of the support member 25 to provide sufficient heat-fusion area and mechanical strength, thereby minimizing the risk of the support member 25 loosening and falling off. At the same time, it avoids the situation where the weld area is too large and occupies too much space, affecting the layout and installation of other components, reducing material waste, and improving the space utilization rate of the battery cell 20.

[0099] According to some embodiments of this application, refer to Figure 4 , Figure 5 , Figure 7 and Figure 8 As shown, the distance between the outer side of the bracket 23 and the outer side of the insulating member 24 is greater than the length of the support member 25.

[0100] Understandably, referring to Figure 4 , Figure 5 , Figure 7 and Figure 8 As shown, during actual processing and assembly, due to limitations in processing technology and production equipment, there may be certain dimensional tolerances in the various components of the battery cell 20. If the length of the support member 25 is set to match or slightly exceed the distance between the outer side of the bracket 23 and the outer side of the insulator 24, the support member 25 may push against the end cap of the outer casing 21 due to dimensional deviations during assembly, thereby affecting the overall structural stability and sealing of the battery cell 20. By designing the distance between the outer side of the bracket 23 and the outer side of the insulator 24 to be greater than the length of the support member 25, sufficient buffer space can be provided for tolerances during assembly, minimizing interference or poor fit during assembly. In this way, after installation, the support member 25 has enough space to prevent it from exerting an outward pushing force on the end cap of the outer casing 21, maintaining the sealing and structural stability of the outer casing 21, enabling the battery cell 20 to operate in a good environment, and extending the service life of the battery device 100.

[0101] The battery cell 20 provided in this application embodiment, through the structural design that the distance between the outer side of the frame and the outer side of the insulating member 24 is greater than the length of the support member 25, provides sufficient tolerance for the assembly process. After installation, the support member 25 has enough space to prevent it from exerting an outward pushing force on the end cap of the outer casing 21, thus maintaining the sealing and structural stability of the outer casing 21. This allows the battery cell 20 to work in a good environment, thereby extending the service life of the battery device 100.

[0102] According to some embodiments of this application, refer to Figure 4 and further refer to Figure 5 The first weld line 201a is spaced apart from the end face of the corresponding end of the support member 25, and the second weld line 201b extends to the edge of the corresponding end of the support member 25.

[0103] In this embodiment, refer to Figure 4 and further refer to Figure 5 The first weld line 201a directly heat-melts the support member 25 and the bracket 23. The second weld line 201b is divided into a first part 2011 that directly heat-melts the support member 25 and the insulating member 24, and a second part 2012 that extends out and is further welded to the insulating member 24. The outer side of the first weld line 201a and the outer side of the second weld line 201b can be spaced apart from the outer shell 21 to reduce excessive deformation of the outer side of the bracket 23 and the insulating member 24, which would affect the assembly of the two with their respective end caps.

[0104] Understandably, referring to Figure 4 and further refer to Figure 5 The first weld line 201a is spaced apart from the end face of the corresponding end of the support member 25. Since the bracket 23 is generally relatively high and structurally stable, the spaced arrangement can provide sufficient connection strength while reducing the risk of excessive heat fusion at the end of the support member 25, which could affect the structural integrity and mechanical properties of the support member 25. The second weld line 201b extends to the edge of the corresponding end of the support member 25. Considering that the insulating member 24 is relatively short, the extended second part 2012 can increase the connection area between the support member 25 and the insulating member 24, making up for the insufficient connection caused by the height difference. This balances the connection strength at both ends of the support member 25, improves the overall structural stability of the battery cell 20, and makes the support member 25 less likely to loosen or fall off when subjected to external forces.

[0105] The battery cell 20 provided in this application embodiment, by only setting the second weld line 201b to extend to the edge of the corresponding end of the support member 25, the second part 2012 extending from the second weld line 201b can increase the connection area between the support member 25 and the insulating member 24, make up for the insufficient connection caused by the height difference, thereby balancing the connection strength at both ends of the support member 25 and improving the overall structural stability of the battery cell 20.

[0106] According to some embodiments of this application, refer to Figure 7 and further refer to Figure 8 The first weld line 201a and the second weld line 201b both extend to the edge of their respective ends of the support member 25.

[0107] In this embodiment, refer to Figure 7 and further refer to Figure 8 The first weld line 201a is divided into a first part 2011 that directly heat-melts the support member 25 and the bracket 23, and a second part 2012 that extends out and is further fused with the bracket 23. Similarly, the second weld line 201b is also divided into a first part 2011 that directly heat-melts the support member 25 and the insulating member 24, and a second part 2012 that extends out and is further fused with the insulating member 24. The outer side of the first weld line 201a and the outer side of the second weld line 201b can be spaced apart from the outer shell 21 to reduce excessive deformation of the outer side of the bracket 23 and the insulating member 24, which would affect the assembly of the two with their respective end caps. Furthermore, due to the extended design of the second weld line 201b, the heat-melting area of ​​the support member 25 can be maximized to overlap with the bracket 23, while the required length of the support member 25 can be reduced, thereby reducing material costs.

[0108] The battery cell 20 provided in this application embodiment has a structural design in which the first weld line 201a and the second weld line 201b both extend to the edge of the corresponding end of the support member 25. This greatly increases the connection area between the support member 25, the bracket 23, and the insulating member 24, comprehensively improving the welding strength at both ends of the support member 25. It also maximizes the overlap between the hot melt area of ​​the support member 25 and the bracket 23, while reducing the required length of the support member 25, thereby reducing material costs and thus reducing the production cost of the entire battery cell 20.

[0109] According to some embodiments of this application, refer to Figure 6 and further refer to Figure 9 This application also provides a support member 25, applied to a battery cell 20 as described in any of the above schemes. One end of the support member 25 along the first direction is provided with a first hot-melt structure 251 for hot-melt connection with the bracket 23 of the battery cell 20, and the other end of the support member 25 along the first direction is provided with a second hot-melt structure 252 for hot-melt connection with the insulating member 24 of the battery cell 20. Both the first hot-melt structure 251 and the second hot-melt structure 252 penetrate the support member 25 along the second direction, and at least one of the first hot-melt structure 251 and the second hot-melt structure 252 is a notch suitable for being opened at the edge of the corresponding end.

[0110] The first hot-melt structure 251 can be designed as a through hole or notch penetrating the support member 25, and the second hot-melt structure 252 can also be designed as a through hole or notch penetrating the support member 25.

[0111] The shape of the through hole can be, but is not limited to, circular, square, or oblong shapes, and this application embodiment does not impose any restrictions on this.

[0112] The shape of the notch may include, but is not limited to, rectangles, trapezoids, semi-circles, or semi-circles, and the embodiments of this application do not impose such limitations.

[0113] The first hot melt structure 251 can be set to one or more, and the second hot melt structure 252 can be set to one or more, where multiple means two or more.

[0114] For example, in some embodiments, reference Figure 6 and further refer to Figure 9 Two of each of the first hot melt structure 251 and the second hot melt structure 252 are provided.

[0115] It is understandable that the weld line formed by the conventional through-hole structure after hot melting will not extend beyond the support member 25, that is, the weld line formed by the through hole after hot melting is separated from the end face of the corresponding end of the support member 25; while the weld line formed by the notch structure after hot melting will extend to the edge of the corresponding end of the support member 25.

[0116] The support member 25 provided in this application embodiment has a notch, which is suitable for being opened at the edge of the corresponding end, by at least one of the first hot-melt structure 251 and the second hot-melt structure 252. This provides a structural basis for at least one of the first weld line 201a and the second weld line 201b to extend to the edge of the corresponding end of the support member 25 after hot melting. This allows the connection end corresponding to the shorter one of the bracket 23 and the insulating member 24 to have a larger hot-melt area, effectively improving the welding strength of the weak connection end of the support member 25, balancing the welding area at both ends of the support member 25, improving the quality and reliability of the hot-melt fixation of the support member 25, thereby greatly reducing the risk of the support member 25 loosening and falling off, and thus improving the stability and reliability of the battery cell 20.

[0117] According to some embodiments of this application, refer to Figure 6 The first hot-melt structure 251 is a through hole, and the second hot-melt structure 252 is a notch.

[0118] In actual implementation, refer to Figures 4-6As shown, the support member 25 is heated and pressurized using a hot melt head of a hot melt device. The length of the hot melt head is greater than the dimension of the first hot melt structure 251 and the second hot melt structure 252 along a third direction. Since the first hot melt structure 251 is a through hole, when the hot melt head heats the through hole, the material of the support member 25 at the through hole softens and flows towards the side wall of the bracket 23 under pressure, fusing together. After an appropriate hot melt time, heating is stopped, and the material cools and solidifies to form the first weld line 201a. Since the second hot melt structure 252 is a notch, when the hot melt head heats the notch, the material at the notch of the support member 25 gradually softens, making close contact with and fusing with the side wall of the insulating member 24. Because the notch is open at the corresponding edge, as the hot melt progresses, the softened material not only flows on the contact surface between the support member 25 and the insulating member 24 but also extends outwards towards the edge of the support member 25. After a certain hot melt time, heating is stopped, and the hot melt area cools and solidifies to form the second weld line 201b.

[0119] The support member 25 provided in this application embodiment, through the design of the first hot-melt structure 251 being a through hole and the second hot-melt structure 252 being a notch, provides a structural basis for only the second weld line 201b extending to the edge of the corresponding end of the support member 25 after hot melting. The second part 2012 extending from the second weld line 201b can increase the connection area between the support member 25 and the insulating member 24, make up for the insufficient connection caused by the height difference, thereby balancing the connection strength at both ends of the support member 25 and improving the overall structural stability of the battery cell 20.

[0120] According to some embodiments of this application, refer to Figure 9 Both the first hot-melt structure 251 and the second hot-melt structure 252 have notches.

[0121] In actual implementation, refer to Figures 7-9As shown, the support member 25 is heated and pressurized using the hot melt head of the hot melt equipment. The length of the hot melt head is greater than the dimension of the first hot melt structure 251 and the second hot melt structure 252 along a third direction. Since the first hot melt structure 251 is a notch, when the hot melt head heats the notch, the material at the notch of the support member 25 gradually softens and comes into close contact with and fuses with the side wall of the bracket 23. Since the notch is open at the corresponding edge, as the hot melt proceeds, the softened material not only flows on the contact surface between the support member 25 and the bracket 23, but also extends outward to the edge of the support member 25. After the hot melt reaches a certain time, heating is stopped, and the hot melt area is allowed to cool and solidify, forming the first weld line 201a. Based on the second hot-melt structure 252 being a notch, when the hot-melt head heats the notch, the material at the notch of the support member 25 gradually softens, making close contact with and fusing with the sidewall of the insulating member 24. Since the notch is open at the corresponding edge, as the hot-melt process proceeds, the softened material not only flows on the contact surface between the support member 25 and the insulating member 24, but also extends outward to the edge of the support member 25. When the hot-melt process reaches a certain time, the heating is stopped, allowing the hot-melt area to cool and solidify, forming the second weld line 201b.

[0122] The support member 25 provided in this application embodiment, through the design that both the first hot-melt structure 251 and the second hot-melt structure 252 are notches, provides a structural basis for the first weld line 201a and the second weld line 201b to extend to the edge of their respective ends after hot melting. The connection area between the support member 25, the bracket 23 and the insulating member 24 is greatly increased, which comprehensively improves the welding strength at both ends of the support member 25, and maximizes the overlap between the hot-melt area of ​​the support member 25 and the bracket 23. At the same time, it can also reduce the required length of the support member 25, thereby reducing material costs and thus reducing the production cost of the entire battery cell 20.

[0123] According to some embodiments of this application, this application also provides a battery device 100, which includes a plurality of battery cells 20.

[0124] According to some embodiments of this application, this application also provides an electrical device. The electrical device includes a battery cell 20 of any of the above embodiments, the battery cell 20 being used to store or provide electrical energy; or the electrical device includes a battery device 100 of any of the above embodiments, the battery device 100 being used to store or provide electrical energy.

[0125] The power supply device can be any of the aforementioned devices or systems that utilize battery device 100.

[0126] According to some embodiments of this application, see Figures 3-6As shown, this application provides a battery cell 20, including: a housing 21, an electrode assembly 22, a bracket 23, an insulator 24, and a support member 25. The electrode assembly 22, bracket 23, and insulator 24 are all disposed within the housing 21, with the bracket 23 and insulator 24 located at opposite ends of the electrode assembly 22 along a first direction. The support member 25 is attached to both sides of the electrode assembly 22 along a second direction, and both ends of the support member 25 are thermally fused to the sidewalls of the bracket 23 and the insulator 24, respectively. A first weld line 201a is formed at the connection between the support member 25 and the bracket 23, and a second weld line 201b is formed at the connection between the support member 25 and the insulator 24. At least one of the first weld line 201a and the second weld line 201b extends to the edge of the corresponding end of the support member 25. The first weld line 201a and the second weld line 201b are spaced apart from the electrode assembly 22 along the first direction. The distance h1 between the first weld line 201a and the electrode assembly 22, and the distance h2 between the second weld line 201b and the electrode assembly 22, satisfy: 0mm

[0127] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0128] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0129] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.​

Claims

1. A battery cell, characterized by, The battery monomer comprises: a shell; an electrode assembly, a bracket and an insulating piece, all of which are arranged in the shell, and the bracket and the insulating piece are respectively located at two ends of the electrode assembly along a first direction; a support piece attached to at least one side of the electrode assembly along a second direction, and the two ends of the support piece are respectively connected to the side wall of the bracket and the insulating piece by hot melting, wherein the connection between the support piece and the bracket forms a first fusion mark, the connection between the support piece and the insulating piece forms a second fusion mark, and at least one of the first fusion mark and the second fusion mark extends to the edge of the corresponding end of the support piece, and the first direction intersects the second direction.

2. The battery cell of claim 1, wherein, Both the first fusion mark and the second fusion mark are distributed away from the electrode assembly along the first direction.

3. The battery cell of claim 2, wherein, The distance h1 between the first fusion mark and the electrode assembly, and the distance h2 between the second fusion mark and the electrode assembly, satisfy: 0mm < h1 ≤ 2mm; 0mm < h2 ≤ 2mm.

4. The battery cell of any one of claims 1-3, wherein, The first fusion mark and / or the second fusion mark comprises a first part on the support piece and a second part beyond the support piece, and the width W1 of the first part and the width W2 of the second part satisfy: 1mm ≤ W1 ≤ 2.5mm, 0mm < W2 ≤ 1mm.

5. The battery cell of any one of claims 1-4, wherein, The distance between the outer side of the bracket and the outer side of the insulating piece is greater than the length of the support piece.

6. The battery cell of any one of claims 1-5, wherein, The first fusion mark is spaced apart from the end face of the corresponding end of the support piece, and the second fusion mark extends to the edge of the corresponding end of the support piece.

7. The battery cell of any one of claims 1-5, wherein, Both the first fusion mark and the second fusion mark extend to the edge of the respective corresponding end of the support piece.

8. A support for use in a battery cell as claimed in any one of claims 1 to 7, characterised in that, One end of the support piece along the first direction is provided with a first hot melting structure for hot melting connection with the bracket of the battery monomer, and the other end along the first direction is provided with a second hot melting structure for hot melting connection with the insulating piece of the battery monomer, and both the first hot melting structure and the second hot melting structure penetrate through the support piece along the second direction, and at least one of the first hot melting structure and the second hot melting structure is a notch adapted to be open at the edge of the corresponding end.

9. Support according to claim 8, characterized in that The first hot melting structure is a through hole, and the second hot melting structure is a notch.

10. Support according to claim 8, characterized in that Both the first hot melting structure and the second hot melting structure are notches.

11. A battery device characterized by comprising: The battery monomer comprises: a plurality of battery monomers according to any one of claims 1-7.

12. An electrical device, comprising: The battery monomer or the battery device according to claim 11 is used for storing or providing electric energy. ​

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