Battery cell, battery device, and electric device

Abstract

The application discloses a battery monomer, a battery device and a power utilization device. The battery monomer comprises a connecting piece. The connecting piece comprises a tab connecting part and a terminal connecting part connected with each other. The tab connecting part is connected with a tab, and the terminal connecting part is connected with an electrode terminal. The tab connecting part has a first surface and a second surface on both sides along the thickness direction of the tab connecting part. The tab connecting part comprises a plurality of recesses. At least part of the recesses is recessed from the first surface to the second surface. In a cross section parallel to the thickness direction and passing through at least one recess, the recess comprises a first side and a second side. The length of at least one of the first side and the second side is greater than the depth of the recess recessed relative to the first surface in the thickness direction. At least part of the plurality of recesses overlaps with the tab in the thickness direction. The problem of the reliability of the battery monomer is solved.

Description

Technical Field

[0001] This application relates to the field of batteries, and in particular to a battery cell, a battery device, and an electrical device. Background Technology

[0002] In recent years, new energy vehicles have made leaps and bounds in development. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role.

[0003] Power batteries consist of several individual battery cells. Improving the reliability of these individual battery cells has become an important research direction in the industry. Summary of the Invention

[0004] This application provides a battery cell, a battery device, and an electrical device that can improve the reliability of the battery cell.

[0005] In a first aspect, some embodiments of this application provide a battery cell including a housing, electrode terminals, an electrode assembly, and an adapter plate; the housing includes a wall portion; the electrode terminals are disposed in the wall portion; the electrode assembly is disposed within the housing, and the electrode assembly includes tabs; the adapter plate is disposed within the housing and includes a tab connection portion and a terminal connection portion connected to each other, the tab connection portion being connected to the tabs, and the terminal connection portion being connected to the electrode terminals; the tab connection portion has a first surface and a second surface on both sides along its own thickness direction; the tab connection portion includes a plurality of recesses, at least a portion of which is recessed from the first surface to the second surface; wherein, in a cross section parallel to the thickness direction and passing through at least one recess, the recess includes a first side and a second side, the length of at least one of the first side and the second side is greater than the depth of the recess in the thickness direction relative to the first surface; at least a portion of the plurality of recesses overlaps with the tabs in the thickness direction.

[0006] By providing a recess on the tab connection portion, and the length of at least one of the first and second sides of the recess being greater than the depth of the recess relative to the first surface in the thickness direction, the contact area when the tab and the tab connection portion are connected is increased, thereby increasing the frictional resistance, improving the connection reliability, reducing the risk of poor soldering, and thus improving the reliability of the battery cell.

[0007] In some alternative embodiments, both the first side and the second side are inclined relative to the thickness direction, and the inclination direction of the first side and the inclination direction of the second side are the same.

[0008] By having the first side tilted in the same direction as the second side, the lengths of the first and second sides can be increased within a preset recess depth, thereby increasing the contact area between the tab and the recess, improving frictional resistance, and thus enhancing stability.

[0009] In some alternative embodiments, the first side and the second side are arranged in parallel.

[0010] By making the first and second sides parallel, the length of the first and second sides can be maximized within a preset depth, and the volume of the recess can be maximized, thereby increasing the contact area with the electrode tab and thus improving the connection stability.

[0011] In some alternative embodiments, the length of the first side is equal to the length of the second side.

[0012] By having the first side and the second side parallel and of equal length, the tab and the recess are made to make uniform contact and balanced, while also facilitating the manufacture of the recess.

[0013] In some alternative embodiments, within the cross-section, the recess includes a third side and an opening, the third side being connected between the first side and the second side, and the opening being formed on the first surface; the orthographic projection of the third side onto the first surface does not overlap with the opening.

[0014] The fact that the projection of the third side onto the first surface does not overlap with the opening makes the length of the first and second sides longer when the recess is at a preset depth, thereby increasing the contact area between the recess and the tab and improving the connection stability.

[0015] In some alternative embodiments, the recess has a first side and a second side in a cross section parallel to the thickness and length directions and passing through at least one recess.

[0016] By incorporating the first and second sides of the recess into a cross-section parallel to the thickness and length directions, which are inclined relative to the thickness direction, the frictional force between the adapter plate and the electrode tab along the length direction is increased, thereby improving the connection stability.

[0017] In some alternative embodiments, multiple recesses are arranged in rows at intervals along the length direction of the adapter piece and in columns at intervals along the width direction of the adapter piece, and the first side edges between adjacent rows or adjacent columns have opposite inclination directions relative to the thickness direction.

[0018] By setting the opposite tilt direction of the first side of the recess, the frictional resistance is increased in multiple directions when the adapter plate and the tab reciprocate.

[0019] In some alternative embodiments, the tab connection includes a connecting body and a plurality of protrusions. The connecting body has a first surface and a second surface. A portion of the protrusion protrudes from the first surface, and the protrusion and the connecting body define a recess. In cross-section, the protrusion forms a second side and the connecting body forms a first side.

[0020] By setting convex parts, the roughness of the first surface of the connecting body is increased. Concave and convex parts further increase the friction between the adapter and the tab, reduce stress concentration, reduce the risk of tab cracking, and improve the stability of the battery cell.

[0021] In some alternative embodiments, the recesses and protrusions are provided in a one-to-one correspondence; the recesses surround the protrusions. By surrounding the protrusions, the influence of the recesses on the strength of the adapter piece is reduced, and the friction is increased. Furthermore, in some embodiments of this application, at least a portion of the plurality of protrusions is welded to the electrode tab.

[0022] In some alternative embodiments, at least a portion of the protrusions is welded to the tab. Welding the protrusions to the tab increases the contact area during the welding process, which can reduce the energy input for welding and thus increase the weld strength.

[0023] In some alternative embodiments, within the cross-section, the recess includes a third side that connects between the first side and the second side, the first side and the second side being arranged in parallel.

[0024] The third side of the recess increases the contact area between the recess and the tab, and the parallel arrangement of the first and second sides reduces the manufacturing difficulty of the recess and the convex part.

[0025] In some alternative embodiments, the depth of the recess relative to the first surface in the thickness direction ranges from 0.01 mm to 1 mm. When the depth of the recess relative to the first surface is within a suitable range, the risk of poor soldering can be reduced, the structural strength of the adapter piece can be guaranteed, and the overcurrent temperature rise can be reduced.

[0026] Secondly, the embodiments provided in this application also provide a battery device, including a housing and the battery cell described in the first aspect, wherein the battery cell is housed within the housing.

[0027] Thirdly, embodiments of this application also provide an electrical device configured to receive electrical energy from the battery device described in the second aspect. Attached Figure Description

[0028] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0029] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0030] Figure 2 Schematic diagram of a battery device provided for some embodiments of this application;

[0031] Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0032] Figure 4 for Figure 3 Schematic diagram of the intermediate connector;

[0033] Figure 5 for Figure 4 A top view of the transfer connector;

[0034] Figure 6 for Figure 5 A sectional view along the AA direction;

[0035] Figure 7 for Figure 5 Another sectional view along the AA direction;

[0036] Figure 8 for Figure 5 Another sectional view along the AA direction;

[0037] Figure 9 for Figure 5 A perspective view along direction AA;

[0038] Figure 10 for Figure 4 Another top view of the transfer connector;

[0039] Figure 11 for Figure 10 A cross-sectional view along the BB direction;

[0040] Figure 12 for Figure 4 Another cross-sectional view of the adapter piece in the diagram.

[0041] The accompanying drawings are not necessarily drawn to scale.

[0042] Explanation of reference numerals in the attached figures:

[0043] 1. Vehicle; 2. Battery assembly; 3. Controller; 4. Motor; 5. Housing; 5a. First housing; 5b. Second housing; 6. Battery cell; 10. Electrode assembly; 11. Tab; 12. First tab; 13. Second tab; 20. Housing; 20a. Wall; 21. Casing; 22. End cap; 30. Electrode terminal;

[0044] 40. Adapter piece; 41. Electrode connection part; 42. Terminal connection part; 41a. First surface; 41b. Second surface; 100. Recess; 101. First side; 102. Second side; 103. Third side; 104. Opening; 110. Protrusion; 120. Connecting body; H. First depth; M. Second depth; X. Length direction; Y. Width direction; Z. Thickness direction. Detailed Implementation

[0045] 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 and completely 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.

[0046] 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.

[0047] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0048] 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.

[0049] 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.

[0050] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0051] In this application, "multiple" means two or more (including two).

[0052] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0053] A power battery, as a battery device, typically refers to a single physical module comprising multiple battery cells to provide higher voltage and capacity. A battery cell is the smallest unit that makes up a battery device. A battery cell includes electrode assemblies, adapter plates, and end cap assemblies. The adapter plates are positioned between the electrode assemblies and the end cap assemblies to achieve electrical connection between them. The adapter plates prevent damage to the battery or burnout of other components in the event of a short circuit in the electrode assemblies or overcharging / overdischarging, thus improving the reliability of battery use.

[0054] Existing adapter plates are typically connected to electrode assemblies using ultrasonic welding. However, the smooth surface of the adapter plate poses a risk of incomplete soldering during the welding process with the electrode assemblies, thereby reducing the reliability of the battery cells.

[0055] In view of this, this application provides a battery cell in which a plurality of recesses are provided in the tab connection portion of the adapter piece, and in a cross section parallel to the thickness direction, the length of one side of the recess is greater than the depth of the recess, thereby increasing the contact area between the tab connection portion of the adapter piece and the electrode assembly, thereby improving the roughness of the tab connection portion and the electrode assembly, reducing the risk of poor soldering, and improving the reliability of the battery cell.

[0056] The battery cells described in this application are applicable to battery devices and electrical equipment using battery devices. Electrical equipment can be devices that use battery devices as a power source or various energy storage systems that use battery devices as energy storage elements. Electrical equipment can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0057] For ease of explanation, the following embodiments use a vehicle as an example of electrical equipment.

[0058] Figure 1 The diagram shows the structural features of a vehicle provided in some embodiments of this application.

[0059] like Figure 1 As shown, a battery device 2 is installed inside the vehicle 1. The battery device 2 can be located at the bottom, front, or rear of the vehicle 1. The battery device 2 can be used to power the vehicle 1; for example, the battery device 2 can serve as the operating power source for the vehicle 1.

[0060] The vehicle 1 may also include a controller 3 and a motor 4. The controller 3 is used to control the battery device 2 to supply power to the motor 4, for example, for the power needs of the vehicle 1 during starting, navigation and driving.

[0061] In some embodiments of this application, the battery device 2 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0062] Figure 2 A schematic diagram of a battery device provided for some embodiments of this application.

[0063] Reference Figure 2 In some embodiments, the battery device 2 may include one or more battery cell assemblies for providing voltage and capacity.

[0064] A battery cell assembly may include multiple battery cells 6, which are connected in series, parallel, or mixed connection via a busbar. Mixed connection means that multiple battery cells 6 are connected in both series and parallel.

[0065] Battery cell 6 can be a secondary battery cell. A secondary battery cell refers to a battery cell that can be recharged after being discharged, allowing the active materials to be activated and continue to be used.

[0066] As an example, the battery cell 6 can be a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-metal hydride battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc.

[0067] As an example, the battery cell 6 can be a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include square battery cells, blade-shaped battery cells, and multi-prismatic battery cells, such as hexagonal prismatic battery cells.

[0068] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells 6; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells 6 into a single module. As an example, a battery module can be formed by bundling multiple battery cells 6 together with cable ties.

[0069] In some embodiments, the battery device 2 may be a battery pack, which includes a housing 5 and one or more battery cell assemblies housed within the housing 5. As an example, the battery cell assembly may be a battery module, which can be housed within the housing 5 by fixing the battery module to the housing 5. Alternatively, as an example, the battery cell assembly may be housed within the housing 5 by directly fixing multiple battery cells 6 to the housing 5.

[0070] In some embodiments, the housing 5 is used to house the battery cell 6, and the housing 5 can have various structures.

[0071] In some embodiments, the housing 5 may include a first housing 5a and a second housing 5b. The first housing 5a and the second housing 5b are fastened together to form a closed space inside the housing 5 to house the battery cell assembly. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first housing 5a may be a top cover or a bottom plate.

[0072] In some embodiments, the battery device 2 may be an energy storage device.

[0073] 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. Energy storage devices can store electrical energy as needed and output it when appropriate. For example, energy storage devices can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours.

[0074] In some embodiments, the energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0075] Figure 3 The diagram shows the structure of a single battery cell provided in some embodiments of this application.

[0076] like Figure 3 As shown, in some embodiments, the battery cell 6 includes a housing 20 and an electrode assembly 10 housed within the housing 20.

[0077] In some embodiments, the outer casing 20 may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), or a composite metal casing (such as a copper-aluminum composite casing), etc.

[0078] In some embodiments, the housing 20 includes a wall portion 20a, which is a component for forming an internal cavity of the battery cell 6. The formed internal cavity can be used to accommodate the electrode assembly 10, the electrolyte, and other components.

[0079] In some embodiments, the wall portion 20a may include a housing 21 and an end cap 22, the housing 21 having an opening and the end cap 22 being connected to the housing 21 and covering the opening.

[0080] The housing 21 and the end cap 22 can be separate components. For example, an opening can be provided on the housing 21, and the end cap 22 can be used to close the opening to form an internal cavity for the battery cell 6.

[0081] The housing 21 can have various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 21 can be determined according to the specific shape and size of the electrode assembly 10.

[0082] The shell 21 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0083] The shape of the end cap 22 can be adapted to the shape of the housing 21 to fit the housing 21. The material of the end cap 22 can be the same as or different from the material of the housing 21. Optionally, the end cap 22 can be made of a material with a certain hardness and strength, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. In this way, the end cap 22 is not easily deformed when subjected to compression and impact, so that the battery cell 6 can have higher structural strength and improve reliability.

[0084] The end cap 22 is connected to the housing 21 by welding, bonding, snap-fitting or other means.

[0085] Electrode assembly 10 is a component in the battery cell 6 where electrochemical reactions occur. The housing 21 may contain one or more electrode assemblies 10.

[0086] The electrode assembly 10 includes a first electrode tab 12, a second electrode plate, and an isolator. The first electrode plate and the second electrode plate have opposite polarities, and the isolator separates the first electrode plate and the second electrode plate.

[0087] One of the first and second electrodes is the positive electrode, and the other is the negative electrode. At least a portion of the separator is located between the positive and negative electrodes. During the charging and discharging of the battery cell 6, active ions, such as lithium ions, repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0088] The positive electrode may include a positive current collector and a positive electrode film layer disposed on at least one surface of the positive current collector.

[0089] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction Z, and the positive electrode film layer is disposed on either or both of the two opposite surfaces of the positive current collector.

[0090] In some embodiments, the positive electrode includes a positive tab. Exemplarily, at least a portion of the positive tab is not provided with a positive electrode film layer.

[0091] In some embodiments, the negative electrode sheet may include a negative electrode current collector. As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode film layer disposed on at least one surface of the negative electrode current collector.

[0092] In some embodiments, the negative electrode sheet includes a negative electrode tab; exemplaryly, at least a portion of the negative electrode tab is not provided with a negative electrode film layer.

[0093] In some embodiments, the separator is a separator membrane. The separator membrane in this application can be any known porous structure separator membrane with good chemical and mechanical stability.

[0094] In some embodiments, the electrode assembly 10 includes an electrode body and a plurality of tabs 11. The plurality of tabs 11 includes a first tab 12 and a second tab 13, which extend from the electrode body. The first tab 12 and the second tab 13 have opposite polarities; in other words, one of the first tab 12 and the second tab 13 is a positive tab, and the other is a negative tab.

[0095] As an example, the portion of the positive current collector coated with a positive electrode film, the portion of the negative current collector coated with a negative electrode film, the positive electrode film, the negative electrode film, and the separator constitute the electrode body. The portion of the positive current collector not coated with a positive electrode film constitutes the positive tab, and the portion of the negative current collector not coated with a negative electrode film constitutes the negative tab. The positive and negative tabs can be led out from the same end of the electrode body, or they can be led out from opposite ends of the electrode body.

[0096] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0097] In some embodiments, the battery cell 6 includes a plurality of electrode terminals 30, the plurality of electrode terminals 30 including a first electrode terminal and a second electrode terminal. Optionally, both the first electrode terminal and the second electrode terminal are insulated from the end cap 22. Optionally, the first electrode terminal is riveted to the end cap 22, and the second electrode terminal is riveted to the end cap 22.

[0098] The battery cell 6 includes a plurality of adapter tabs 40, which connect the electrode terminals 30 and the electrode assembly 10. The adapter tabs 40 are made of a material with good electrical conductivity, such as metals like copper, nickel, and aluminum. Exemplarily, the adapter tabs 40 can be one piece or a combination of multiple pieces.

[0099] In one example, one adapter 40 is connected between the first electrode terminal and the first tab 12, and another adapter 40 is connected between the second electrode terminal and the second tab 13.

[0100] Figure 4 for Figure 3 A schematic diagram of the intermediate connector.

[0101] The adapter plate 40 includes a tab connection part 41 and a terminal connection part 42, which can be an integral structure or a separate connection structure.

[0102] For example, the tab connection portion 41 is welded or bonded to the tab 11 to achieve electrical connection between the tab connection portion 41 and the tab 11. The terminal connection portion 42 is welded or bonded to the electrode terminal 30 to achieve electrical connection between the terminal connection portion 42 and the electrode terminal 30.

[0103] In one example, the tab connection 41 and the tab 11 are ultrasonically welded.

[0104] The tab connection portion 41 has a first surface 41a and a second surface 41b on both sides along its thickness direction Z, and the first surface 41a is connected to the tab 11. In one example, the first surface 41a and the second surface 41b are planar.

[0105] For example, the materials of the tab connection portion 41 and the terminal connection portion 42 may be the same or different.

[0106] In some alternative embodiments of this application, the terminal connection portion 42 protrudes from the surface of the tab connection portion 41 facing the wall portion 20a; the wall portion 20a includes an electrode lead-out hole, the electrode terminal 30 covers the electrode lead-out hole, and at least a portion of the terminal connection portion 42 is accommodated in the electrode lead-out hole and connected to the electrode terminal 30.

[0107] The terminal connection portion 42 protrudes along the thickness direction Z onto the tab connection portion 41. For example, the terminal connection portion 42 can be a solid protrusion or a hollow protrusion.

[0108] The adapter plate 40 is provided with one or more terminal connection portions 42.

[0109] The wall portion 20a is provided with an electrode lead-out hole along the thickness direction Z. In one example, the wall portion 20a is an end cap 22, and the electrode lead-out hole is provided through the end cap 22 along the thickness direction Z. The terminal connection portion 42 passes through the electrode lead-out hole and connects to the electrode terminal 30.

[0110] The electrode terminal 30 is positioned opposite the electrode lead-out hole along the thickness direction Z. The size of the electrode terminal 30 is greater than or equal to that of the electrode lead-out hole, so that the electrode terminal 30 covers the upper side of the electrode lead-out hole.

[0111] For example, the terminal connection portion 42 may be partially or entirely accommodated in the electrode lead-out hole.

[0112] The terminal connection portion 42 protrudes from the tab connection portion 41 to facilitate a secure connection with the electrode terminal 30. It also facilitates laser welding of the terminal connection portion 42 and the electrode terminal 30, reducing damage to the battery cell 6 from spatter during laser welding.

[0113] Figure 5 for Figure 4 A top view of the transfer connector; Figure 6 for Figure 5 A cross-sectional view along the AA direction.

[0114] like Figures 3 to 6 As shown, this application embodiment provides a battery cell 6 including a housing 20, electrode terminals 30, an electrode assembly 10, and an adapter plate 40. The housing 20 includes a wall portion 20a; the electrode terminals 30 are disposed in the wall portion 20a; the electrode assembly 10 is disposed within the housing 20 and includes tabs 11; the adapter plate 40 is disposed within the housing 20 and includes a tab connecting portion 41 and a terminal connecting portion 42 connected to each other. The tab connecting portion 41 is connected to the tabs 11, and the terminal connecting portion 42 is connected to the electrode terminals 30. The tab connecting portion 41 has a first surface on both sides along its own thickness direction Z. 41a and second surface 41b, the tab connection portion 41 includes a plurality of recesses 100, at least a portion of which is recessed from the first surface 41a toward the second surface 41b; wherein, in a cross section parallel to the thickness direction Z and passing through at least one recess 100, the recess 100 includes a first side 101 and a second side 102, at least one of the first side 101 and the second side 102 having a length greater than the depth of the recess 100 recessed relative to the first surface 41a in the thickness direction Z; at least a portion of the plurality of recesses 100 overlaps with the tab 11 in the thickness direction Z.

[0115] For example, the plurality of recesses 100 may be located on a portion of the tab connection portion 41, or the plurality of recesses 100 may be evenly distributed throughout the entire tab connection portion 41. After the tab connection portion 41 is connected to the tab 11, a portion of the plurality of recesses 100 is connected to the tab 11, and a portion overlaps with the tab 11 in the thickness direction Z.

[0116] As an example, the recess 100 is cylindrical, prismatic, conical, or pyramidal in shape.

[0117] In some examples, the recess 100 is entirely formed by the first surface 41a recessing into the second surface 41b. Alternatively, a portion of the recess 100 is formed by the first surface 41a recessing into the second surface 41b, while another portion is formed by the first surface 41a protruding away from the second surface 41b.

[0118] For example, a cross section parallel to the thickness direction Z can be a first cross section, which includes other cross sections such as a cross section parallel to the thickness direction Z and parallel to the length direction X, and a cross section parallel to the thickness direction Z and parallel to the width direction Y. The thickness direction Z, length direction X, and width direction Y of the adapter piece 40 are all perpendicular to each other.

[0119] The first cross section may pass through one or more recesses 100. Within the first cross section, a recess 100 may include a first side 101 and a second side 102, or a recess 100 may also include other sides such as a third side 103.

[0120] As an example, the recess 100 can be a pit or groove. For example, within the first cross-section, the recess 100 can be a simple shape such as a triangle, rectangle, or trapezoid, or it can be a complex shape composed of simple shapes. Exemplarily, when the recess 100 is entirely formed by the first surface 41a recessing into the second surface 41b, the depth of the recess 100 includes a first depth H in the thickness direction Z relative to the first surface 41a. When a portion of the recess 100 is formed by the first surface 41a recessing into the second surface 41b, and another portion is formed by the first surface 41a protruding away from the second surface 41b, the depth of the recess 100 includes a first depth H in the thickness direction Z relative to the first surface 41a and a second depth in the thickness direction Z relative to the protruding top surface.

[0121] The length of one of the first side 101 and the second side 102 is greater than the first depth H, or the lengths of both the first side 101 and the second side 102 are greater than the first depth H. In one example, the length of the first side 101 is greater than the first depth H, and the length of the second side 102 is equal to the first depth H; or the length of the second side 102 is greater than the first depth H, and the length of the first side 101 is equal to the first depth H. The lengths of the first side 101 and the second side 102 may be equal or unequal.

[0122] In some examples, within the first cross section, both the first side 101 and the second side 102 are inclined relative to the thickness direction Z, and the inclination angles of the first side 101 and the second side 102 relative to the thickness direction Z may be the same or different.

[0123] As an example, within the first cross section, the recess 100 can be an isosceles triangle, a right triangle, an obtuse triangle, a parallelogram, a right trapezoid, an isosceles trapezoid, etc.

[0124] By providing a recess 100 on the tab connection portion 41, and the length of at least one of the first side 101 and the second side 102 of the recess 100 being greater than the depth of the recess 100 in the thickness direction Z relative to the first surface 41a, the contact area when the tab 11 is connected to the tab connection portion 41 is increased, thereby increasing the frictional resistance, improving the connection reliability, reducing the risk of poor soldering, and thus improving the reliability of the battery cell.

[0125] Figure 7 for Figure 5 Another sectional view along the AA direction; Figure 8 for Figure 5 Another sectional view along the AA direction.

[0126] like Figures 5 to 8 As shown, further, in some embodiments of this application, both the first side 101 and the second side 102 are inclined relative to the thickness direction Z, and the inclination direction of the first side 101 is the same as that of the second side 102.

[0127] Both the first side 101 and the second side 102 have an angle with the thickness direction Z. As an example, the first angle between the first side 101 and the thickness direction Z is between 0 degrees and 90 degrees; the second angle between the first side 101 and the thickness direction Z is between 0 degrees and 90 degrees.

[0128] The first side 101 and the second side 102 have the same inclination tendency relative to the thickness direction Z. For example, both the first side 101 and the second side 102 are inclined to the left or right along the length direction X relative to the thickness direction Z. Alternatively, both the first side 101 and the second side 102 are inclined to the left or right along the width direction Y relative to the thickness direction Z. The inclination angles of the first side 101 and the second side 102 relative to the thickness direction Z can be the same or different.

[0129] For example, in a plurality of recesses 100, the inclination direction of the first side 101 of a portion of the recesses 100 is the same as the inclination direction of the second side 102, while the inclination direction of the first side 101 of a portion of the recesses 100 is different from the inclination direction of the second side 102. Alternatively, in a plurality of recesses 100, the inclination direction of the first side 101 and the inclination direction of the second side 102 of all the recesses 100 are the same.

[0130] As an example, within the first cross section, the recess 100 is in the shape of an obtuse triangle, a parallelogram, etc.

[0131] By having the first side 101 tilted in the same direction as the second side 102, the lengths of the first side 101 and the second side 102 can be increased within the preset depth of the recess 100, thereby increasing the contact area between the tab 11 and the recess 100, improving frictional resistance, and thus improving stability.

[0132] Continue to refer to Figure 6 and Figure 8 In some optional embodiments of this application, the first side 101 and the second side 102 are arranged in parallel.

[0133] That is, the first angle between the first side 101 and the thickness direction Z and the second angle between the second side 102 and the thickness direction Z are the same.

[0134] By making the first side 101 and the second side 102 parallel, the length of the first side 101 and the second side 102 can be maximized within a preset depth, and the volume of the recess 100 can be maximized, thereby increasing the contact area with the tab 11 and improving the connection stability.

[0135] In one embodiment, within the cross-section, the recess 100 further includes a third side 103, which connects between the first side 101 and the second side 102. The third side 103 may be parallel to or at an angle to the first surface 41a.

[0136] In one embodiment, the recess 100 includes an opening 104 formed on the first surface 41a. The orthographic projection of the third side 103 onto the first surface 41a does not overlap with or overlaps with the opening 104.

[0137] In one example, the orthographic projection of the third side 103 onto the first surface 41a partially overlaps with the opening 104. In another example, the orthographic projection of the third side 103 onto the first surface 41a has a gap with the opening 104.

[0138] Continue to refer to Figure 6 In some embodiments of this application, the length of the first side 101 is equal to the length of the second side 102.

[0139] In other words, the difference between the length of the first side 101 and the first depth H of the recess 100 is equal to the difference between the length of the second side 102 and the first depth H of the recess 100.

[0140] For example, the first side 101 may be parallel to or not parallel to the second side 102.

[0141] By making the first side 101 and the second side 102 parallel and of equal length, the tab 11 and the recess 100 are in uniform contact and balanced, which also facilitates the manufacturing of the recess 100.

[0142] In one embodiment, the third side 103 is arranged parallel to the first surface 41a, such that the recess depth of the recess 100 relative to the first surface 41a is equal everywhere.

[0143] like Figure 5 and Figure 6 As shown, in some optional embodiments of this application, in the cross section, the recess 100 includes a third side 103 and an opening 104. The third side 103 is connected between the first side 101 and the second side 102, and the opening 104 is formed on the first surface 41a. The orthographic projection of the third side 103 onto the first surface 41a does not overlap with the opening 104.

[0144] The opening 104 can be a simple or complex shape, such as a circle, rectangle, or triangle. In one example, the opening 104 is parallel to the third side 103.

[0145] There may be a gap or no gap between the orthographic projection of the third side 103 onto the first surface 41a and the opening 104.

[0146] The fact that the orthographic projection of the third side 103 onto the first surface 41a does not overlap with the opening 104 makes the length of the first side 101 and the second side 102 longer when the recess 100 is at a preset depth, thereby increasing the contact area between the recess 100 and the tab 11 and improving the connection stability.

[0147] Furthermore, in one embodiment of this application, in a cross section parallel to the thickness direction Z and the length direction X and passing through at least one recess 100, the recess 100 has a first side 101 and a second side 102.

[0148] For example, when the adapter piece 40 and the tab 11 are ultrasonically welded, the tab connecting portion 41 of the adapter piece 40 and the tab 11 are repeatedly rubbed in one direction to form a fusion between molecular layers. In one example, the adapter piece 40 and the tab 11 rub against each other along the length direction X. To increase the friction, the first side 101 and the second side 102 of the recess 100 are inclined along the length direction X relative to the thickness direction Z.

[0149] In some examples, along the length direction X, the first side 101 and the second side 102 are inclined relative to the thickness direction Z in a direction away from the terminal connection portion 42. When the adapter piece 40 rubs against the tab 11 along the length direction X, the frictional force between the tab connection portion 41 and the tab 11 is less when moving from the side away from the terminal connection portion 42 to the side closer to the terminal connection portion 42 than when moving from the side closer to the terminal connection portion 42 to the side away from the terminal connection portion 42.

[0150] By inclining the first side 101 and the second side 102 of the recess 100 relative to the thickness direction Z in a cross section parallel to the thickness direction Z and the length direction X, the frictional force between the adapter piece 40 and the tab 11 along the length direction X is increased, thereby improving the connection stability.

[0151] Figure 9 for Figure 5 A perspective view along the AA direction.

[0152] like Figure 5 and Figure 9As shown, in one embodiment of this application, a plurality of recesses 100 are arranged in rows at intervals along the length direction X of the adapter piece 40 and in columns at intervals along the width direction Y of the adapter piece 40, and the first side 101 between adjacent rows or adjacent columns has an inclination direction opposite to that of the thickness direction Z.

[0153] In some examples, the first side 101 of a plurality of recesses 100 in a row are inclined in the same direction with respect to the thickness direction Z and are inclined toward the side away from the terminal connection portion 42; the first side 101 of a plurality of recesses 100 in adjacent rows are inclined in the same direction with respect to the thickness direction Z and are inclined toward the side closer to the terminal connection portion 42.

[0154] By setting the opposite inclination direction of the first side 101 of the recess 100, the frictional resistance is increased in multiple directions when the adapter piece 40 and the tab 11 reciprocate.

[0155] Figure 10 for Figure 4 Another top view of the intermediate connector 40; Figure 11 for Figure 10 A cross-sectional view along the BB direction; Figure 12 for Figure 4 Another cross-sectional view of the adapter piece 40 in the middle.

[0156] like Figures 10 to 12 As shown, in some embodiments of this application, the tab connection portion 41 includes a connection body 120 and a plurality of protrusions 110. The connection body 120 has a first surface 41a and a second surface 41b. A portion of the protrusions 110 protrudes from the first surface 41a. The protrusions 110 and the connection body 120 define a recess 100. In cross-section, the protrusions 110 form a second side 102, and the connection body 120 forms a first side 101.

[0157] The connecting body 120 is the main part of the tab connecting portion 41, and the recess 100 and the protrusion 110 are formed in the connecting body 120. For example, the connecting body 120 may be rectangular, U-shaped or the like.

[0158] Exemplarily, a portion of the protrusion 110 protrudes from the first surface 41a, and another portion of the protrusion 110 is connected to the connecting body 120. In one example, within a cross-section, two sides of the protrusion 110 are connected to the connecting body 120. In another example, one side of the protrusion 110 is connected to the connecting body 120.

[0159] The connecting body 120 and the protrusion 110 form the sidewall of the recess 100. Exemplarily, the protrusion 110 forms one sidewall of the recess 100, and the connecting body 120 forms the other sidewall of the recess 100. The sidewall of the recess 100 can be a flat surface or a curved surface.

[0160] The tab connection portion 41 may include one or more protrusions 110.

[0161] In some examples, the protrusion 110 is cylindrical, prismatic, conical, pyramidal, or similar shapes.

[0162] In other examples, in the projection plane along the width direction Y, the concave portion 100 and the convex portion 110 may overlap or not overlap.

[0163] For example, all of the recesses 100 may be defined by the connecting body 120 and the protrusion 110, or some of the recesses 100 may be defined by the connecting body 120 and the protrusion 110.

[0164] For example, the first side 101 and the second side 102 may be parallel to the thickness direction Z or set at an angle to the thickness direction Z.

[0165] The depth of the recess 100 includes a first depth H that is recessed relative to the first surface 41a in the thickness direction Z and a second depth M that is recessed relative to the convex top surface in the thickness direction Z.

[0166] By setting the protrusion 110, the roughness of the first surface 41a of the connecting body 120 is increased. The concave portion 100 and the protrusion 110 further increase the friction between the adapter piece 40 and the tab 11, reduce stress concentration, reduce the risk of the tab 11 cracking, and improve the stability of the battery cell 6.

[0167] Furthermore, in one specific embodiment of this application, the recess 100 and the convex portion 110 are provided in a one-to-one correspondence; the recess 100 is provided around the convex portion 110.

[0168] In some examples, the recess 100 may partially or completely surround the protrusion 110. That is, in the projection plane along the width direction Y, the protrusion 110 completely or partially overlaps the recess 100.

[0169] By providing a recess 100 surrounding a protrusion 110, the influence of the recess 100 on the strength of the adapter piece 40 is reduced, and the friction is increased. Furthermore, in some embodiments of this application, at least a portion of the plurality of protrusions 110 are welded to the tab 11.

[0170] For example, a portion of the plurality of protrusions 110 is welded to the tab 11, while another portion is positioned on one side of the tab 11. Alternatively, all of the plurality of protrusions 110 are welded to the tab 11.

[0171] For example, welding can be performed by ultrasonic welding, laser welding, resistance welding, pulsed arc welding, etc.

[0172] The welding of the protrusion 110 to the tab 11 increases the contact area during the welding process, which can reduce the energy input during welding and thus improve the welding strength.

[0173] Continue to refer to Figure 11 In some embodiments of this application, within the cross-section, the recess 100 includes a third side 103, which is connected between the first side 101 and the second side 102, and the first side 101 and the second side 102 are arranged in parallel.

[0174] For example, within the cross section, the recess 100 is positioned on one or both sides of the protrusion 110.

[0175] In one example, within the cross section, the third side 103 is positioned on opposite sides of the protrusion 110.

[0176] In some examples, in the top view of the adapter piece 40, the third side 103 is ring-shaped.

[0177] The recess 100 has a third side 103 to increase the contact area between the recess 100 and the tab 11, and the parallel arrangement of the first side 101 and the second side 102 reduces the manufacturing difficulty of the recess 100 and the protrusion 110.

[0178] In some embodiments, the adapter piece 40 is integrally formed.

[0179] Furthermore, in some embodiments of this application, the depth of the recess 100 relative to the first surface 41a in the thickness direction Z ranges from 0.01 mm to 1 mm.

[0180] As an example, the first depth H can be 0.01mm, 0.03mm, 0.05mm, 0.1mm, 0.8mm, or 1mm.

[0181] For example, the depth of the recess 100 relative to the first surface 41a ranges from 0.03 mm to 0.1 mm.

[0182] When the recess depth of the recess 100 relative to the first surface 41a is within a suitable range, the risk of poor soldering can be reduced, the structural strength of the adapter piece 40 can be guaranteed, and the overcurrent temperature rise can be reduced.

[0183] This application also provides a battery device 2, including a housing 5 and a battery cell 6 as described in the above embodiments, wherein the battery cell 6 is housed within the housing 5.

[0184] This application embodiment also provides an electrical device configured to receive electrical energy from the battery device 2 in the above embodiment.

[0185] like Figure 3 , Figure 5 and Figure 6As shown, one embodiment of this application provides a battery cell 6 including a housing 20, electrode terminals 30, electrode assembly 10, and adapter plate 40. The housing 20 includes a wall portion 20a; the electrode terminals 30 are disposed in the wall portion 20a; the electrode assembly 10 is disposed inside the housing 20 and includes tabs 11; the adapter plate 40 is disposed inside the housing 20 and includes a tab connection portion 41 and a terminal connection portion 42 connected to each other. The tab connection portion 41 is connected to the tabs 11, and the terminal connection portion 42 is connected to the electrode terminals 30. The tab connection portion 41 has a first surface 41a and a second surface 41b on both sides along its own thickness direction Z. The tab connection portion 41 includes a plurality of recesses 100, which are formed by recesses from the first surface 41a to the second surface 41b.

[0186] In a cross section parallel to the thickness direction Z and passing through at least one recess 100, the recess 100 includes a first side 101, a second side 102, a third side 103, and an opening 104. The length of at least one of the first side 101 and the second side 102 is greater than the depth of the recess 100 in the thickness direction Z relative to the first surface 41a. At least a portion of the plurality of recesses 100 overlaps with the tab 11 in the thickness direction Z. The third side 103 connects between the first side 101 and the second side 102, and the opening 104 is formed on the first surface 41a.

[0187] Both the first side 101 and the second side 102 are inclined relative to the thickness direction Z, and the inclination direction of the first side 101 is the same as that of the second side 102. The first side 101 and the second side 102 are arranged parallel to each other, and the length of the first side 101 is equal to the length of the second side 102. The orthographic projection of the third side 103 onto the first surface 41a does not overlap with the opening 104.

[0188] The depth of the recess 100 relative to the first surface 41a ranges from 0.03 mm to 0.1 mm.

[0189] like Figure 3 , Figure 10 and Figure 11 As shown, another embodiment of this application provides a battery cell 6 including a housing 20, electrode terminals 30, electrode assembly 10, and adapter plate 40. The housing 20 includes a wall portion 20a; the electrode terminals 30 are disposed in the wall portion 20a; the electrode assembly 10 is disposed inside the housing 20 and includes tabs 11; the adapter plate 40 is disposed inside the housing 20 and includes a tab connection portion 41 and a terminal connection portion 42 connected to each other. The tab connection portion 41 is connected to the tabs 11, and the terminal connection portion 42 is connected to the electrode terminals 30.

[0190] The tab connection portion 41 includes a connecting body 120, a plurality of protrusions 110, and a plurality of recesses 100. The connecting body 120 has a first surface 41a and a second surface 41b on both sides along its thickness direction Z. A portion of the recesses 100 is formed by the first surface 41a recessing into the second surface 41b, and another portion is formed by the first surface 41a protruding away from the second surface 41b. In a cross-section parallel to the thickness direction Z and passing through at least one recess 100, the recess 100 includes a first side 101, a second side 102, a third side 103, and an opening 104. A portion of the protrusions 110 protrudes from the first surface 41a, and the protrusions 110 and the connecting body 120 define the recess 100. In the cross-section, the protrusions 110 form the second side 102, and the connecting body 120 forms the first side 101. The third side 103 connects between the first side 101 and the second side 102, and the first side 101 and the second side 102 are arranged parallel to each other.

[0191] The recesses 100 and protrusions 110 are provided in a one-to-one correspondence; the recesses 100 are arranged around the protrusions 110. At least a portion of the plurality of recesses 100 overlaps with the tab 11 in the thickness direction Z, and at least a portion of the plurality of protrusions 110 is welded to the tab 11. The depth of the recess 100 relative to the first surface 41a ranges from 0.03 mm to 0.1 mm.

[0192] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions. Unless otherwise specified, all technical features and optional technical features of this application can be combined to form new technical solutions.

[0193] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A battery cell, characterized in that, include: The outer casing, including the walls; Electrode terminals are disposed on the wall portion; An electrode assembly is disposed within the housing, the electrode assembly including tabs; An adapter piece is disposed within the housing and includes a tab connection portion and a terminal connection portion connected to each other. The tab connection portion is connected to the tab, and the terminal connection portion is connected to the electrode terminal. The tab connection portion has a first surface and a second surface on both sides along its own thickness direction. The tab connection portion includes a plurality of recesses, at least a portion of which is formed by recessing from the first surface to the second surface. Wherein, in a cross section parallel to the thickness direction and passing through at least one of the recesses, the recess includes a first side and a second side, and the length of at least one of the first side and the second side is greater than the depth of the recess in the thickness direction relative to the first surface; At least a portion of the plurality of recesses overlaps with the tab in the thickness direction.

2. The battery cell according to claim 1, characterized in that, Both the first side and the second side are inclined relative to the thickness direction, and the inclination direction of the first side and the inclination direction of the second side are the same.

3. The battery cell according to claim 2, characterized in that, The first side and the second side are arranged in parallel.

4. The battery cell according to claim 3, characterized in that, The length of the first side is equal to the length of the second side.

5. The battery cell according to claim 2, characterized in that, Within the cross-section, the recess includes a third side and an opening, the third side being connected between the first side and the second side, and the opening being formed on the first surface; The orthographic projection of the third side onto the first surface does not overlap with the opening.

6. The battery cell according to claim 2, characterized in that, In a cross section parallel to the thickness and length directions and passing through at least one of the recesses, the recess has a first side and a second side.

7. The battery cell according to claim 2, characterized in that, The plurality of recesses are arranged in rows at intervals along the length direction of the adapter piece and in columns at intervals along the width direction of the adapter piece, and the first side edges between adjacent rows or adjacent columns have opposite inclination directions relative to the thickness direction.

8. The battery cell according to claim 1, characterized in that, The tab connection includes a connecting body and a plurality of protrusions. The connecting body has a first surface and a second surface. A portion of the protrusion protrudes from the first surface, and the protrusion and the connecting body define the recess. Within the cross-section, the protrusion forms the second side, and the connecting body forms the first side.

9. The battery cell according to claim 8, characterized in that, The concave and convex portions are provided in a one-to-one correspondence; The recess is provided around the protrusion.

10. The battery cell according to claim 8, characterized in that, At least a portion of the plurality of protrusions are welded to the electrode tab.

11. The battery cell according to claim 8, characterized in that, Within the cross-section, the recess includes a third side, which connects the first side and the second side, and the first side and the second side are arranged in parallel.

12. The battery cell according to any one of claims 1 to 11, characterized in that, In the thickness direction, the depth of the recess relative to the first surface ranges from 0.01 mm to 1 mm.

13. A battery device, characterized in that, It includes a housing and a battery cell according to any one of claims 1 to 12, wherein the battery cell is housed within the housing.

14. An electrical appliance, characterized in that, The electrical device is configured to receive electrical energy supplied from the battery device of claim 13.

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