Battery cell, battery device, energy storage device, energy storage system and charging network

Abstract

The utility model belongs to the technical field of batteries, and provides a battery monomer, a battery device, an energy storage device, an energy storage system and a charging network. Each single battery comprises a shell, an electrode assembly and an adapter, the electrode assembly is installed in the shell and provided with a tab, a first connecting part of the adapter is connected with the tab, a second connecting part of the adapter is connected with the electrode terminal, and the first connecting part is located on the side of the second connecting part in the second direction; the size of the second connecting part in the second direction is smaller than the size of the second connecting part in the third direction perpendicular to the second connecting part, so that the occupied space of the second connecting part, namely the connecting part of the adapter and the electrode terminal, in the second direction can be reduced, more space is provided for the arrangement of the first connecting part, the connecting area of the adapter and the tab is increased, and the connecting efficiency is improved. The connection strength is increased, the overcurrent capacity is improved, the first connection part can be closer to the second connection part in the second direction, the current conduction path from the tab to the electrode terminal can be shortened, the internal resistance is reduced, and the current transmission efficiency is improved.

Description

Technical Field

[0001] This application belongs to the field of battery technology, and more specifically, relates to a battery cell, battery device, energy storage device, energy storage system and charging network. Background Technology

[0002] Energy conservation and emission reduction are crucial for the sustainable development of all industries in society, and new energy technologies, with their advantages in energy conservation and environmental protection, have become an important component of the sustainable development of various energy-consuming industries. For new energy technologies, battery technology is a critical factor in their development.

[0003] In battery devices, the tabs of the electrode assembly inside the battery cell are usually welded to the electrode terminals located on the casing via adapters. The reliability and overcurrent capacity of the connection between the adapter and the tabs and electrode terminals affect the reliability of the battery cell. Therefore, how to optimize the connection between the adapter and the tabs and electrode terminals is a key concern in the industry.

[0004] The above statements are for the purpose of providing background information in relation to this application only and do not necessarily constitute prior art. Utility Model Content

[0005] The purpose of this application is to provide a battery cell, battery device, energy storage device, energy storage system, and charging network to improve the connection reliability and overcurrent capacity between the adapter and the tab and electrode terminals of the battery cell in the related technology, thereby improving the reliability of the battery cell in use.

[0006] In a first aspect, embodiments of this application provide a single battery cell, comprising:

[0007] The outer casing is equipped with electrode terminals;

[0008] Electrode assembly, installed inside the housing, the electrode assembly has tabs;

[0009] The adapter includes a main body, a first connecting part and a second connecting part, both of which are disposed on the main body. The first connecting part is connected to the electrode tab and the second connecting part is connected to the electrode terminal.

[0010] The electrode terminal is located on the side of the electrode assembly along the first direction, the first connecting part is located on the side of the second connecting part along the second direction, the size of the second connecting part along the second direction is smaller than the size of the second connecting part along the third direction, the second direction is perpendicular to the third direction and intersects the first direction.

[0011] In this embodiment of the battery cell, the adapter has a first connecting portion and a second connecting portion. The adapter is connected to the tab of the electrode assembly through the first connecting portion and then connected to the electrode terminal through the second connecting portion, thereby enabling the tab to be electrically connected to the electrode terminal through the adapter, thus realizing power transmission. The first connecting portion is located on the side of the second connecting portion along a second direction. The dimension of the second connecting portion in the second direction is smaller than its dimension in a perpendicular third direction, and the second direction and the third direction are located in the same plane, i.e., the second connecting portion is generally flat. On the one hand, the smaller dimension of the second connecting portion in the second direction reduces the space occupied by the part of the second connecting portion (i.e., the part connecting the adapter to the electrode terminal) in the second direction, thus providing more space for the first connecting portion. This allows the adapter to have a relatively larger space for connecting to the tab, increasing the connection area between the adapter and the tab, increasing the connection strength, and improving the current carrying capacity. Furthermore, the first connecting portion... The second direction allows it to be positioned as close as possible to the second connection part, which helps to shorten the current conduction path from the tab to the electrode terminal, reduce internal resistance, and improve current transmission efficiency. On the other hand, the second connection part itself can be expanded in the third direction so that the adapter can still provide sufficient size to connect with the electrode terminal, meeting the requirements for a reliable connection between the adapter and the electrode terminal. In this way, the connection between the adapter and the tab and the electrode terminal can take into account factors such as connection strength, overcurrent capacity, and internal resistance. The electrical connection stability and reliability between the tab and the electrode terminal of the electrode assembly are improved, and the reliability and stability of the battery cell are also improved accordingly.

[0012] In some embodiments, the plane formed by the second direction and the third direction is used as the projection plane, and the orthographic projection of the second connecting part on the projection plane is an ellipse or a rectangle.

[0013] By adopting the technical solution of this embodiment, the second connecting part is designed to be generally elliptical or rectangular in shape, and its structure is flat, thereby reserving enough space in the second direction of the adapter for connecting the tab.

[0014] In some embodiments, along the second direction, the first connecting portion and the second connecting portion are positioned opposite each other at a distance.

[0015] By adopting the technical solution of this embodiment, the first connecting part and the second connecting part are arranged facing each other, allowing the second connecting part to be closer to the first connecting part. The current path from the tab to the electrode terminal has virtually no offset in the second direction, resulting in a shorter and more direct current conduction path, which helps reduce resistance. Simultaneously, a portion of the area between the first and second connecting parts is not connected to the tab or the electrode terminal, reserving space for the adapter to connect to both the tab and the electrode terminal. This reduces the probability of direct contact between the electrode terminal and the tab, thereby reducing the risk of short circuits.

[0016] In some embodiments, an adapter includes two first connecting portions and a second connecting portion. Along a second direction, the second connecting portion is disposed in the middle of the adapter, and the two first connecting portions are respectively disposed on two opposite sides of the second connecting portion.

[0017] By adopting the technical solution of this embodiment, in an adapter, two first connecting parts are arranged opposite each other on both sides of the first connecting parts along the second direction. The current path from the two tabs to the electrode terminals does not deviate in the second direction, and the current conduction path can be set to be shorter. The shortened overcurrent path helps to further reduce internal resistance and improve overcurrent capacity.

[0018] In some embodiments, the first direction is perpendicular to the second and third directions, the second connecting portion protrudes from the main body portion toward the electrode terminal along the first direction, the surface of the electrode terminal toward the adapter is provided with a groove, and at least a portion of the second connecting portion is accommodated in the groove along the first direction.

[0019] By adopting the technical solution of this embodiment, a groove is provided on the electrode terminal to accommodate the second connecting part. The provision of the second connecting part will not cause an excessive increase in the size of the battery cell in the first direction, which can reduce the risk of increased battery cell volume and reduced energy density due to the provision of the protruding second connecting part. Furthermore, the snap-fit ​​between the second connecting part and the groove on the electrode terminal can also limit the relative movement between the electrode terminal and the second connecting part, i.e., the adapter, thereby reducing the probability of shear stress at the welding point and reducing the risk of reduced welding strength due to shear stress acting on the welding connection.

[0020] In some embodiments, with the first direction as the projection direction, the projection of the groove covers the projection of the second connection portion.

[0021] By adopting the technical solution of this embodiment, the plane formed by the second direction and the third direction is used as the projection plane. The area of ​​the groove on the projection plane is greater than or equal to the area of ​​the second connecting part on the projection plane, so that the second connecting part can be adapted to be inserted into the groove.

[0022] In some embodiments, the groove is any one of an elliptical groove, a rectangular groove, a square groove, or a circular groove.

[0023] In some embodiments, the main body has a first surface facing the electrode terminal, the second connecting portion protrudes from the first surface, the second connecting portion has a sidewall portion connected to the first surface, and the angle between the sidewall portion and the first surface is greater than 90° and less than or equal to 130°.

[0024] By adopting the technical solution of this embodiment, the second connecting part can have a smoother transition when inserted into the groove of the electrode terminal, reducing the risk of excessive stress concentration; at the same time, within the above-mentioned angle range, when the adapter is manufactured by injection molding, casting or stamping, the side of the second connecting part is slightly inclined relative to the demolding direction during the demolding stage, which can reduce the interface area and friction between the second connecting part and the mold, thereby achieving smooth demolding.

[0025] In some embodiments, the second connecting portion is integrally stamped with the main body portion.

[0026] By adopting the technical solution of this embodiment, the main body and the second connecting part are formed by stamping. The main body and the second connecting part are a continuous whole, and there is no additional connecting interface or connecting structure between them. The processing technology is simple and the forming efficiency is high. Moreover, compared with the split design, the second connecting part has stronger resistance to bending and falling off, and stronger resistance to welding heat.

[0027] In some embodiments, the thickness of the main body portion along the first direction is D, and the thickness of the sidewall portion along the second or third direction is d, wherein d ≥ 4 / 5 * D.

[0028] By adopting the technical solution of this embodiment, the sidewall of the second connecting part has sufficient rigidity and resistance to bending and deformation. In addition, since the adapter is a conductive component and the second connecting part is used to transmit current, its thickness affects the current carrying capacity. Setting the thickness of the sidewall part to be close to that of the main body part can also reduce the risk of insufficient local current carrying capacity due to excessive thinness of the adapter, improve the smoothness of the current conduction path throughout the adapter, and reduce resistance and heat generation.

[0029] In some embodiments, the second connecting portion further includes a flat plate portion connected to the side wall portion, the flat plate portion being welded to the groove wall of the groove, and the thickness of the flat plate portion being 35% to 95% of the thickness of the main body portion along the first direction;

[0030] And / or, the first connecting part is welded to the electrode tab, and along the first direction, the thickness of the first connecting part is 35% to 95% of the thickness of other parts of the main body.

[0031] By adopting the technical solution of this embodiment, both the flat plate portion of the first connecting part and the second connecting part have sufficient thickness to maintain the integrity and basic strength of the structure, while the thickness is not too thick, which can reduce the welding energy required during welding, reduce the welding difficulty, and reduce the adverse effects of welding heat.

[0032] In some embodiments, the adapter further includes at least one ear that protrudes from the side of the adapter in a third direction.

[0033] By adopting the technical solution of this embodiment, a protruding ear is provided on the side of the adapter along a third direction. This ear can be used to cooperate with the groove structure on the external auxiliary structure during the assembly process to limit the movement of the adapter and reduce the risk of movement of the adapter during the assembly process. At the same time, a groove structure adapted to the ear can also be provided on the outer shell of the battery cell. The ear and the groove structure on the outer shell cooperate to form a limiting structure, which is used to limit the movement of the adapter after the adapter is installed.

[0034] In some embodiments, the battery cell includes two adapters, each adapter having an ear on each of its two sides along a third direction, one of the two ears of the same adapter having a chamfer, and the chamfered ears of the two adapters being located on different sides.

[0035] By adopting the technical solution of this embodiment, the chamfer can serve as a foolproof structure to distinguish between positive and negative adapters.

[0036] Secondly, embodiments of this application provide a battery device including a plurality of battery cells as described in the above embodiments.

[0037] Thirdly, embodiments of this application provide an energy storage device, including a battery device as described in the above embodiments, the battery device being used to store or provide electrical energy.

[0038] Fourthly, embodiments of this application provide an energy storage system, including a power conversion device and an energy storage device as described in the above embodiments, wherein the power conversion device is electrically connected between the power generation device and the energy storage device.

[0039] Fifthly, embodiments of this application provide a charging network, including a charging pile and an energy storage device or an energy storage system as described in the above embodiments, wherein the energy storage device is used to provide electrical energy to the charging pile.

[0040] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or exemplary technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0043] Figure 2 for Figure 1 The diagram shows an exploded view of a single battery cell.

[0044] Figure 3 for Figure 1 A bottom view of the cover (with adapter) of the battery cell shown in the first direction;

[0045] Figure 4 for Figure 1 A top view of the battery cell shown along the first direction;

[0046] Figure 5 For along Figure 4 Sectional view of line AA in the middle;

[0047] Figure 6 For along Figure 4 Sectional view of the middle BB line;

[0048] Figure 7 for Figure 6 Enlarged view of point A in the middle;

[0049] Figure 8 for Figure 1 A schematic diagram of the adapter for the battery cell shown;

[0050] Figure 9 A schematic diagram of the structure of the cover of a battery cell provided in some embodiments;

[0051] Figure 10 A schematic diagram of the structure of the cover of a battery cell provided for other embodiments;

[0052] Figure 11 A top view of a battery cell along a first direction, provided for some other embodiments;

[0053] Figure 12 This is an exploded view of the battery device according to some embodiments of this application;

[0054] Figure 13 This is a schematic diagram of the structure of an energy storage device according to some embodiments of this application;

[0055] Figure 14 This is a schematic diagram of the structure of an energy storage system according to some embodiments of this application;

[0056] Figure 15 This is a schematic diagram of the structure of a charging network according to some embodiments of this application.

[0057] The main markings in the attached figures are as follows:

[0058] 10. Battery cells;

[0059] 11. Outer shell; 101. Housing; 102. Cover; 111. Opening; 112. Receiving cavity; 12. Electrode assembly; 121. Electrode tab; 13. Electrode terminal; 131. Groove; 14. Adapter; 141. First connecting part; 142. Second connecting part; 1421. Side wall part; 1422. Flat plate part; 143. Main body part; 1431. First surface; 144. Tab; 1441. Chamfer; 145. Embossing;

[0060] 100. Battery assembly; 20. Housing; 21. Cover plate; 22. Base plate;

[0061] 200. Charging network; 201. Charging station; 202. Connector;

[0062] 300. Energy storage system; 301. Power conversion device; 302. Power generation device; 303. Energy storage device; 304. Cabinet;

[0063] F1, first direction; F2, second direction; F3, third direction. Detailed Implementation

[0064] To make the technical problem to be solved, the technical solution and the beneficial effects of this application clearer, the following is in conjunction with the appendix. Figures 1 to 15 The present application will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

[0065] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein 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 specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0066] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0067] In this document, the term "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 throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments in any suitable manner.

[0068] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0069] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0070] Unless otherwise specified, all steps of this application may be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), indicating that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, the mention that the method may also include step (c) indicates that step (c) may be added to the method in any order; for example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc.

[0071] In the description of the embodiments 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, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0072] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces). "Several" means one or more, unless otherwise explicitly specified.

[0073] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0074] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0075] In the description of the embodiments of this application, unless otherwise expressly specified and limited, when an element is referred to as "fixed to" or "set on" another element, it may be directly on or indirectly on the other element. When an element is referred to as "connected to" another element, it may be directly connected to or indirectly connected to the other element.

[0076] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "proximity" refers to being close in location. For example, among three components A1, A2, and B, if the distance between A1 and B is greater than the distance between A2 and B, then A2 is closer to B than A1; that is, A2 is adjacent to B, or B is adjacent to A2. Similarly, when there are multiple components C, namely C1, C2, ... CN, if one component C, such as C2, is closer to component B than the other components C, then B is adjacent to C2, or C2 is adjacent to B.

[0077] A battery cell, as the smallest unit that makes up a battery, typically includes a casing and an electrode assembly. The electrode assembly is located inside the casing and has tabs. The casing has electrode terminals, and the tabs of the electrode assembly are connected to the electrode terminals to realize the input and output of electrical energy.

[0078] Typically, a battery cell also includes an adapter, which is located between the electrode assembly and the electrode terminals. The adapter is welded to connect the tabs of the electrode assembly and the electrode terminals. In actual production, since the area available for welding between the electrode terminals and the adapter is limited, the design of the welding area during welding must meet the strength requirements of the welded connection while also taking into account factors such as the current path and internal resistance.

[0079] In related technologies, a circular protrusion is provided in the central area of ​​the adapter, and correspondingly, a groove is provided on the bottom surface of the electrode terminal. The circular protrusion in the central area of ​​the adapter is embedded in the bottom groove of the electrode terminal and welded to it. The areas on both sides of the circular protrusion of the adapter are used for welding with the tabs. Due to the limited size of the adapter piece, the circular protrusion needs to meet the welding connection strength requirements between the adapter piece and the electrode terminal. Thus, the circular protrusion usually occupies a large central area, and the area on both sides of the adapter piece that can be used for welding with the tabs is too small, resulting in insufficient welding strength between the tabs and the adapter piece and limited current carrying capacity. In some cases, the two shoulders of the adapter piece located on the circular protrusion are welded to the tabs. Although this can increase the welding area between the tabs and the adapter piece to a certain extent, this setting increases the current carrying path, leading to an increase in the internal resistance of the battery cell, affecting the input and output of electrical energy, and is also not conducive to improving the reliability and stability of the battery.

[0080] Based on this, this application provides a battery cell whose adapter has a first connecting portion and a second connecting portion. The adapter is connected to the tab of the electrode assembly through the first connecting portion and then connected to the electrode terminal through the second connecting portion, thereby enabling the tab to be electrically connected to the electrode terminal through the adapter, thus realizing power transmission. The first connecting portion is located on the side of the second connecting portion along a second direction. The size of the second connecting portion in the second direction is smaller than its size in a perpendicular third direction, and the second and third directions are located on the same plane, i.e., the second connecting portion is generally flat. On the one hand, the smaller size of the second connecting portion in the second direction reduces the space occupied by the part of the second connecting portion (i.e., the part connecting the adapter to the electrode terminal) in the second direction, thus providing more space for the first connecting portion. This allows the adapter to have a relatively larger space for connecting to the tab, increasing the connection area between the adapter and the tab, increasing the connection strength, and improving the current carrying capacity. Furthermore, the first connecting portion... The second direction allows it to be positioned as close as possible to the second connection part, which helps to shorten the current conduction path from the tab to the electrode terminal, reduce internal resistance, and improve current transmission efficiency. On the other hand, the second connection part itself can be expanded in the third direction so that the adapter can still provide sufficient size to connect with the electrode terminal, meeting the requirements for a reliable connection between the adapter and the electrode terminal. In this way, the connection between the adapter and the tab and the electrode terminal can take into account factors such as connection strength, overcurrent capacity, and internal resistance. The electrical connection stability and reliability between the tab and the electrode terminal of the electrode assembly are improved, and the reliability and stability of the battery cell are also improved accordingly.

[0081] The following, in conjunction with the appendix Figures 1 to 11 The following detailed description of the battery cell of this application, along with specific embodiments, is provided. Specifically, there are three directions: a first direction F1, a second direction F2, and a third direction F3. The height direction of the battery cell is in the same direction as the first direction, the width direction is in the same direction as the second direction, and the length direction is in the same direction as the third direction.

[0082] like Figures 1 to 8As shown, this application embodiment provides a battery cell 10, which includes a housing 11, an electrode assembly 12, and an adapter 14. The housing 11 is provided with electrode terminals 13. The electrode assembly 12 is installed inside the housing 11 and has tabs 121. The adapter 14 includes a main body 143, a first connecting part 141, and a second connecting part 142. The first connecting part 141 and the second connecting part 142 are both disposed on the main body 143. The first connecting part 141 is connected to the tabs 121, and the second connecting part 142 is connected to the electrode terminals 13. The electrode terminals 13 are located on the side of the electrode assembly 12 along a first direction, and the first connecting part 141 is located on the side of the second connecting part 142 along a second direction. The dimension of the second connecting part 142 along the second direction is smaller than the dimension of the second connecting part 142 along a third direction. The second direction is perpendicular to the third direction and intersects the first direction.

[0083] In this embodiment, the battery cell 10 can be a secondary battery, which refers to a battery cell 10 that can be recharged to activate the active materials and continue to be used after the battery cell 10 has been discharged.

[0084] In some embodiments, the battery cell 10 may 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., but is not limited to these.

[0085] In some embodiments, the battery cell 10 may be in the shape of a cuboid, cylinder, prism, flattened or other shapes.

[0086] like Figure 1 and Figure 2 As shown in this embodiment, the battery cell 10 includes a housing 11 and an electrode assembly 12. The housing 11 is the outer shell structure of the battery cell 10, providing installation space for the electrode assembly 12 and protecting it, while also providing necessary mechanical strength for the entire battery cell 10. The housing 11 can have various shapes and sizes, such as cuboid, cylindrical, or hexagonal prism. Specifically, the shape of the housing 11 can be determined according to the specific shape and size of the electrode assembly 12. The material of the housing 11 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, or plastic; this embodiment does not impose any special limitations on this.

[0087] In this embodiment, the electrode assembly 12 is installed inside the housing 11. The electrode assembly 12 is the core part of the battery cell 10 where an electrochemical reaction occurs to achieve energy storage and release. The electrode assembly 12 has tabs 121, which are extensions of the electrode assembly 12 and are used to make electrical connections with external circuits to output the electrical energy generated by the electrode assembly 12 or receive externally input electrical energy for charging.

[0088] In some embodiments, the battery cell 10 may include one or more electrode assemblies 12. The number of electrode assemblies 12 can be set as needed. When there are multiple electrode assemblies 12, the multiple electrode assemblies 12 can be arranged sequentially along the width direction of the housing 11, or sequentially along the length direction of the housing 11, or sequentially arranged in other arrangements. The electrode assembly 12 includes a positive electrode and a negative electrode with different polarities, as well as a separator. During the charging and discharging process of the battery cell 10, active ions (e.g., lithium ions) repeatedly insert and extract between the positive and negative electrode. The separator, disposed between the positive and negative electrode, can prevent short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0089] In the embodiments of this application, such as Figures 2 to 4 As shown, the housing 11 is provided with electrode terminals 13, and the battery cell 10 also includes an adapter 14. The electrode terminals 13 are the interface for connecting the battery cell 10 with external devices or other battery cells 10, through which the input and output of electrical energy of the electrode assembly 12 are realized. The adapter 14 acts as a bridge between the electrode assembly 12 and the electrode terminals 13, and is used to realize the electrical connection between the electrode assembly 12 and the electrode terminals 13.

[0090] In a specific embodiment, the electrode assembly 12 has a positive electrode tab and a negative electrode tab, the electrode terminal 13 includes a positive terminal and a negative terminal, and the adapter 14 includes a positive adapter and a negative adapter. The positive adapter connects the positive electrode tab and the positive terminal, and the negative adapter connects the negative electrode tab and the negative terminal. In subsequent embodiments, for ease of description, the positive electrode tab and the negative electrode tab are collectively referred to as electrode tab 121, the positive adapter and the negative adapter are collectively referred to as adapter 14, and the positive terminal and the negative terminal are collectively referred to as electrode terminal 13. The positive terminal and the negative terminal can be made of the same material or different materials. For example, the positive terminal can be an aluminum terminal made of aluminum, and the negative terminal can be a copper-aluminum composite terminal made of copper-aluminum composite material.

[0091] In the embodiments of this application, such as Figure 2 , Figure 3 and Figure 6 As shown, the adapter 14 includes a main body 143 and a first connecting part 141 and a second connecting part 142 disposed on the main body 143. The main body 143 is the base part of the adapter 14. The first connecting part 141 and the second connecting part 142 are attached or integrated on the main body to realize the connection function of the adapter 14 with other components such as tabs 121 and electrode terminals 13.

[0092] The main body 143 is provided with a first connecting portion 141, which is connected to the electrode 121, thereby enabling the transmission of electrical energy between the electrode 121 and the adapter 14. Specifically, the first connecting portion 141 can be directly or indirectly connected to the electrode 121. For example, the first connecting portion 141 is welded to the electrode 121, or the first connecting portion 141 is riveted or crimped to the electrode 121, etc.

[0093] The main body 143 is provided with a second connecting part 142. A first connecting part 141 is provided on the side of the second connecting part 142 and connected to the second connecting part 142. The second connecting part 142 is connected to the electrode terminal 13. That is, the first connecting part 141 and the second connecting part 142 are two parts of the adapter 14. The adapter 14 is electrically connected to the tab 121 and the electrode terminal 13 through the first connecting part 141 and the second connecting part 142. The second connecting part 142 is directly or indirectly connected to the electrode terminal 13. For example, the second connecting part 142 can be welded to the electrode terminal 13, or the second connecting part 142 can be riveted or crimped to the electrode terminal 13, etc.

[0094] In the embodiments of this application, such as Figure 3 ,and Figures 6 to 8As shown, electrode terminal 13 is located on the side of electrode assembly 12 along a first direction, and first connecting portion 141 is located on the side of second connecting portion 142 along a second direction. The dimension W1 of second connecting portion 142 along the second direction is smaller than the dimension W2 of second connecting portion 142 along a third direction. The second direction is perpendicular to the third direction and intersects the first direction. Specifically, electrode terminal 13 is located on the side of electrode assembly 12 along the first direction, meaning that electrode terminal 13 and electrode assembly 12 are arranged along the first direction. Electrode terminal 13 is located on one side of electrode assembly 12 in the first direction. For example, the first direction can be the height direction of battery cell 10, with electrode terminal 13 located in the upper or lower space of electrode assembly 12. Alternatively, the first direction can be the length direction of battery cell 10, with electrode terminal 13 located in the left (right) or front (rear) space of electrode assembly 12. In a specific embodiment, electrode assembly 12 has tab 121, which protrudes along the first direction, facilitating connection with electrode terminal 13. The first connecting portion 141 is located on the side of the second connecting portion 142 along the second direction. The second connecting portion 142 and the first connecting portion 141 are arranged along the second direction, with the first connecting portion 141 located on the side of the second connecting portion 142 in the second direction. The second direction intersects the first direction. For example, when the first direction is the height direction, the second direction can be the width direction or the length direction. The first connecting portion 141 is located in the left (right) side space or the front (rear) side space of the second connecting portion 142. In a specific embodiment, the tab 121 is connected to the first connecting portion 141, and the electrode terminal 13 is connected to the second connecting portion 142. That is, the tab 121 is connected to the adapter 14 at the position of the electrode terminal 13 on the side along the second direction. The dimension of the second connecting portion 142 along the second direction is smaller than the dimension of the second connecting portion 142 along the third direction. The second direction is perpendicular to the third direction and intersects the first direction, meaning that the second direction and the third direction are located in the same plane. In this plane, the dimension of the second connecting portion 142 in the second direction is smaller than the dimension in the third direction, and the second connecting portion 142 has a flat structure. For example, if the second direction is the width direction, then the third direction corresponds to the length direction. The first connecting portion 141 and the second connecting portion 142 are arranged along the width direction, and the width dimension of the second connecting portion 142 is smaller than its length dimension. In a specific embodiment, the second connecting portion 142 may be an elliptical structure, a rectangular structure, or other irregularly shaped structure with a length greater than its width. It can be understood that "the second direction is perpendicular to the third direction and intersects the first direction" means that the second direction is perpendicular to the third direction, the second direction intersects the first direction, and the third direction also intersects the first direction. The second direction may or may not be perpendicular to the first direction, and the third direction may or may not be perpendicular to the first direction.

[0095] Thus, in the battery cell 10 of this application embodiment, the adapter 14 has a first connecting part 141 and a second connecting part 142. The adapter 14 is connected to the tab 121 of the electrode assembly 12 through the first connecting part 141, and then connected to the electrode terminal 13 through the second connecting part 142, so that the tab 121 is electrically connected to the electrode terminal 13 through the adapter 14, thereby realizing power transmission. The first connecting portion 141 is located on the side of the second connecting portion 142 along the second direction. The dimension of the second connecting portion 142 in the second direction is smaller than its dimension in the perpendicular third direction, and the second direction and the third direction are located in the same plane, that is, the second connecting portion 142 is generally flat. On the one hand, the smaller dimension of the second connecting portion 142 in the second direction can reduce the space occupied by the part of the second connecting portion 142, i.e., the part connecting the adapter 14 and the electrode terminal 13, in the second direction, thereby providing more space for the first connecting portion 141. This allows the adapter 14 to have relatively larger space for connecting with the tab 121. The connection area between the adapter 14 and the tab 121 is increased, the connection strength is increased, and the current carrying capacity is improved. Furthermore, the first connecting portion 141 in The second direction can be positioned as close as possible to the second connection part 142, which helps to shorten the current conduction path from the tab 121 to the electrode terminal 13, reduce internal resistance, and improve current transmission efficiency. On the other hand, the second connection part 142 itself can be expanded in the third direction so that the adapter 14 can still provide sufficient size to connect with the electrode terminal 13, meeting the requirements for reliable connection between the adapter 14 and the electrode terminal 13. In this way, the connection between the adapter 14 and the tab 121 and the electrode terminal 13 can take into account factors such as connection strength, overcurrent capacity, and internal resistance. The electrical connection stability and reliability between the tab 121 and the electrode terminal 13 of the electrode assembly 12 are improved, and the reliability and stability of the battery cell 10 are also improved accordingly.

[0096] In some embodiments, such as Figure 3 , Figure 5 and Figure 8 As shown, along the second direction, the first connecting portion 141 and the second connecting portion 142 are positioned opposite each other at intervals.

[0097] In this embodiment, the first connecting portion 141 and the second connecting portion 142 are aligned on a straight line along the second direction. That is, when viewed from the second direction, the center of the first connecting portion 141 and the center of the second connecting portion 142 are on the same straight line, and their projections overlap at least at the midpoint. For example, when the second direction is a front-back direction, the first connecting portion 141 and the second connecting portion 142 face each other in the front-back direction. For instance, the first connecting portion 141 is in front, and the second connecting portion 142 is behind, and their centers are on the same straight line in the front-back direction. Thus, the first connecting portion 141 connects to the tab 121, and the second connecting portion 142 connects to the electrode terminal 13. The direct alignment of the first connecting portion 141 and the second connecting portion 142 allows the second connecting portion 142 to be closer to the first connecting portion 141. The current path from the tab 121 to the electrode terminal 13 has essentially no offset in the second direction, resulting in a shorter and more direct current conduction path, which helps to reduce resistance.

[0098] Furthermore, the first connecting portion 141 and the second connecting portion 142 are spaced apart along the second direction, meaning that there is a portion of the first connecting portion 141 and the second connecting portion 142 that is not connected to the tab 121 or the electrode terminal 13. This provides space for the adapter 14 to connect with the tab 121 and the electrode terminal 13, reducing the probability of direct contact between the electrode terminal 13 and the tab 121, thereby reducing the risk of short circuit.

[0099] In a specific embodiment, such as Figure 3 , Figure 5 and Figure 8 As shown, an adapter 14 includes two first connecting portions 141 and one second connecting portion 142. Along the second direction, the second connecting portion 142 is located in the middle of the adapter 14, and the two first connecting portions 141 are respectively located on two opposite sides of the second connecting portion 142.

[0100] In this embodiment, an adapter 14 includes two first connecting portions 141 and one second connecting portion 142, meaning the adapter 14 has three functional parts: two first connecting portions 141 and one second connecting portion 142. These together constitute the adapter 14 to connect the tabs 121 and the electrode terminals 13. The second connecting portion 142 is located in the middle of the adapter 14, specifically in the second direction. Two first connecting portions 141 are positioned with approximately equal space on both sides, meaning one first connecting portion 141 is positioned on each of the two first connecting portions 142 (either on the left or right, or front or back) along the second direction. The two first connecting portions 141 are respectively used to connect to the tabs 121 of the two electrode assemblies 12. The second connecting portion 142 is located between the two first connecting portions 141 and connects to the electrode terminals 13. Thus, in an adapter 14, two first connecting portions 141 are arranged opposite each other on both sides of the first connecting portion 141 along the second direction. The current paths from the two tabs 121 to the electrode terminals 13 are not offset in the second direction. The current conduction paths can be set to be shorter. The shortened overcurrent path helps to further reduce internal resistance and improve overcurrent capacity.

[0101] In a specific embodiment, along the second direction, the spacing between the two first connecting portions 141 and the second connecting portion 142 can be equal, thereby making the current conduction paths from the two tabs 121 to the electrode terminals 13 substantially equal. Alternatively, the spacing between the two first connecting portions 141 and the second connecting portion 142 can be unequal, thereby optimizing the spatial arrangement of the two electrode assemblies 12.

[0102] In some embodiments, such as Figure 3 and Figure 8 As shown, the plane formed by the second direction and the third direction is the projection plane, and the orthographic projection of the second connecting part 142 on the projection plane is an ellipse or a rectangle.

[0103] In this embodiment, the second direction and the third direction are two mutually perpendicular spatial directions, and the plane formed by them is a two-dimensional reference plane. Using this plane as a projection plane, the outline of the second connecting part 142 projected onto this projection plane is elliptical or rectangular. That is, the dimension of the second connecting part 142 along the second direction is smaller than its dimension along the third direction. The second direction is either the minor axis of the ellipse or the width direction of the rectangle, and the third direction is either the major axis of the ellipse or the length direction of the rectangle. Thus, by designing the second connecting part 142 as a generally elliptical or rectangular structure with a flat design, sufficient space is reserved in the second direction of the adapter 14 for connecting the tab 121.

[0104] For example, the second connecting portion 142 can be a planar structure provided on the adapter 14, such as the adapter 14 being a sheet-like structure, and the second connecting portion 142 being an elliptical or rectangular region of the adapter 14; or, the second connecting portion 142 can be a three-dimensional structure provided on the adapter 14, such as the adapter 14 being a sheet-like structure, and the second connecting portion 142 being an elliptical or rectangular protrusion of the adapter 14, etc. Figure 8 As shown.

[0105] In some embodiments, such as Figures 5 to 8 As shown, the first direction is perpendicular to the second and third directions. The second connecting part 142 protrudes from the main body 143 along the first direction toward the electrode terminal 13. The surface of the electrode terminal 13 toward the adapter 14 is provided with a groove 131. Along the first direction, at least a portion of the second connecting part 142 is accommodated in the groove 131.

[0106] In this embodiment, the second connecting portion 142 is a protrusion extending towards the electrode terminal 13 along the first direction. The electrode terminal 13 has a groove 131 at a position corresponding to the second connecting portion 142. Part or all of the second connecting portion 142 is accommodated in the groove 131. The portion of the second connecting portion 142 located in the groove 131 can be electrically connected to the electrode terminal 13 by welding or pressing. Thus, by providing a groove 131 on the electrode terminal 13 to accommodate the second connecting portion 142, the provision of the second connecting portion 142 will not cause an excessive increase in the size of the battery cell 10 in the first direction. This reduces the risk of increased volume and decreased energy density of the battery cell 10 due to the protruding second connecting portion 142. Furthermore, the snap-fit ​​engagement between the second connecting portion 142 and the groove 131 on the electrode terminal 13 can also limit the relative movement between the electrode terminal 13 and the second connecting portion 142, i.e., the adapter 14, thereby reducing the probability of shear stress at the connection point and the risk of reduced connection strength due to shear stress acting on the connection point.

[0107] In a specific embodiment, at least a portion of the groove wall of the groove 131 is welded to the second connecting portion 142. That is, a portion of the groove wall of the groove 131 is welded to the second connecting portion 142, for example, the bottom wall of the groove 131 is welded to the second connecting portion 142, or the side wall of the groove 131 is welded to the second connecting portion 142, etc.; or, the entire groove wall of the groove 131 is used for welding to the second connecting portion 142, that is, both the bottom wall and the side wall of the groove 131 are welded to the second connecting portion 142. The welding can be performed using laser welding, resistance welding, etc. Laser welding has the characteristics of high precision and high energy density, and can form high-quality welds in a short time, making it particularly suitable for battery cells 10 with high welding precision requirements. Resistance welding, on the other hand, achieves welding by generating heat through the flow of current through the workpiece, and has good adaptability to workpieces of different materials.

[0108] In some embodiments, such as Figures 5 to 7 As shown, with the first direction as the projection direction, the projection of the groove 131 covers the projection of the second connecting part 142.

[0109] Thus, with the plane formed by the second direction and the third direction as the projection plane, the area of ​​the groove 131 on the projection plane is greater than or equal to the area of ​​the second connecting part 142 on the projection plane, so that the second connecting part 142 can be adapted to be inserted into the groove 131.

[0110] In some embodiments, the groove 131 is any one of an elliptical groove, a rectangular groove, a square groove, or a circular groove.

[0111] In this embodiment, provided that the projected area of ​​the groove 131 is greater than or equal to the projected area of ​​the second connecting part 142, that is, the second connecting part 142 can be inserted into the groove 131, the shape of the groove 131 can be any one of an elliptical groove, a rectangular groove, a square groove, or a circular groove.

[0112] For example, the groove 131 is a circular groove, such as Figure 10 As shown, the second connecting part 142 is an elliptical protrusion or a rectangular protrusion, or the groove 131 is an elliptical groove, such as... Figure 9 As shown, the second connecting part 142 is an elliptical protrusion or a rectangular protrusion, or the groove 131 is a rectangular groove and the second connecting part 142 is an elliptical protrusion or a rectangular protrusion, or the groove 131 is an elliptical groove and the second connecting part 142 is an elliptical protrusion or a rectangular protrusion, etc.

[0113] In a specific embodiment, such as Figure 8 and Figure 10 As shown, the groove 131 is a circular groove, and the second connecting part 142 is an elliptical protrusion. Thus, compared with a rectangular protrusion, the curved contour of the elliptical second connecting part 142 can disperse stress and reduce the risk of stress concentration during welding or assembly. At the same time, when the elliptical second connecting part 142 and the circular groove 131 are engaged, their curved surface contact can achieve a more uniform pressure distribution and improve the stability of the electrical connection. In addition, the diameter of the circular groove 131 is greater than or equal to the major axis of the elliptical protrusion, so that the second connecting part 142 can be inserted into the groove 131. The circular groove 131 is hollowed out on both sides along the minor axis of the elliptical protrusion, which can also save materials and help reduce costs.

[0114] Understandably, in specific embodiments, the electrode terminal 13 can also be an elliptical cylindrical structure, such as... Figure 4 As shown; or, the electrode terminal 13 can be a cylindrical structure, such as... Figure 11As shown; or, the electrode terminal 13 may also be of other shapes, and the structural form of the electrode terminal 13 itself is not limited here.

[0115] In some embodiments, such as Figure 3 , Figure 5 , Figure 7 and Figure 8 As shown, the main body 143 has a first surface 1431 facing the electrode terminal 13, and a second connecting portion 142 protrudes from the first surface 1431. The second connecting portion 142 has a side wall portion 1421 connected to the first surface 1431. The angle between the side wall portion 1421 and the first surface 1431 is greater than 90° and less than or equal to 130°.

[0116] In this embodiment, the second connecting portion 142 protrudes from the main body portion 143 toward the first surface 1431 of the electrode terminal 13. That is, the second connecting portion 142 extends toward the electrode terminal 13 based on the main body portion 143. The second connecting portion 142 has a side wall portion 1421 connected to the first surface 1431. The side wall portion 1421 forms a certain included angle α with the first surface 1431. The included angle range is greater than 90° and less than or equal to 130°, so that the second connecting portion 142 can have a smoother transition when inserted into the groove 131 of the electrode terminal 13, reducing the risk of excessive stress concentration. At the same time, within the above-mentioned angle range, when the adapter 14 is manufactured by injection molding or stamping, during the demolding stage, the side of the second connecting portion 142 is slightly inclined relative to the demolding direction, which can reduce the interface area and friction between the second connecting portion 142 and the mold, thereby achieving smooth demolding.

[0117] In a specific embodiment, the included angle between the sidewall portion 1421 and the first surface 1431 can be 91°, 92°, 95°, 98°, 100°, 102°, 105°, 110°, 115°, 120°, 125°, 128° or 130°, etc. The included angle between the two is not limited here, and can be selected according to actual needs during design.

[0118] In a specific embodiment, the second connecting part 142 and the main body part 143 are integrally stamped.

[0119] That is, the main body 143 and the second connecting part 142 are formed by stamping process. The main body 143 and the second connecting part 142 are a continuous whole, and there is no additional connecting interface or connecting structure between them. The processing technology is simple and the forming efficiency is high. Moreover, compared with the split design, the second connecting part 142 has stronger resistance to bending and falling off, and is also stronger in terms of the ability to withstand welding heat.

[0120] In some embodiments, such as Figure 7 and Figure 8As shown, the thickness of the main body 143 along the first direction is D, and the thickness of the side wall 1421 along the second or third direction is d, where d≥4 / 5*D.

[0121] In this embodiment, the sidewall portion 1421 protrudes relative to the main body portion 143 along a first direction. The thickness of the sidewall portion 1421 is the wall thickness of the sidewall portion 1421 along a direction perpendicular to the protrusion direction (i.e., the first direction), which is a second direction or a third direction. The wall thickness of the sidewall portion 1421 is greater than or equal to four-fifths of the thickness of the main body portion 143, that is, the thickness of the sidewall portion 1421 is 80% or more of the thickness of the main body portion 143. This ensures that the sidewall portion 1421 of the second connecting portion 142 has sufficient rigidity and resistance to bending and deformation. Furthermore, since the adapter 14 is a conductive component and the second connecting portion 142 is used to transmit current, its thickness affects its current-carrying capacity. Setting the thickness of the sidewall portion 1421 close to that of the main body portion 143 reduces the risk of insufficient local current-carrying capacity due to local thinness of the adapter 14, improves the smoothness of the current conduction path throughout the adapter 14, and reduces resistance and heat generation. The thickness D of the main body 143 refers to the thickness of the portion of the main body 143 excluding the first connecting portion 141.

[0122] Understandably, the adapter 14 is a single piece, with the second connecting portion 142 and the main body portion 143 integrally stamped. The ratio of the thickness of the side wall portion 1421 along the second or third direction to the thickness of the main body portion 143 along the first direction is less than or equal to 1. Of course, in other embodiments, the thickness of the side wall portion 1421 may also be greater than the thickness of the main body portion 143.

[0123] In a specific embodiment, the ratio of the thickness of the sidewall portion 1421 along the second or third direction to the thickness of the main body portion 143 along the first direction can be 0.8, 0.82, 0.85, 0.88, 0.9, 0.92, 0.95, 0.98, 1, 1.05, 1.1, or 1.2, etc. The specific ratio between the two is not uniquely limited here, and can be selected according to actual needs during design.

[0124] In some embodiments, such as Figure 7 and Figure 8 As shown, the second connecting portion 142 also has a flat plate portion 1422 connected to the side wall portion 1421. The flat plate portion 1422 is welded to the groove wall of the groove 131. Along the first direction, the thickness of the flat plate portion 1422 is 35% to 95% of the thickness of the main body portion 143.

[0125] In this embodiment, the plate portion 1422 is a component of the second connecting portion 142. The plate portion 1422 is connected to the side wall portion 1421 and is located at the end of the second connecting portion 142 away from the main body portion 143. The plate portion 1422 directly contacts and welds to the groove wall of the groove 131 of the electrode terminal 13. The thickness of the plate portion 1422 is set to 35% to 95% of the thickness of the main body portion 143, so that the plate portion 1422 has sufficient thickness to maintain the integrity and basic strength of the structure, while the thickness of the plate portion 1422 is not too thick, which can reduce the welding energy required during welding, reduce the welding difficulty, and reduce the adverse effects of welding heat.

[0126] In a specific embodiment, the thickness of the flat plate portion 1422 can be 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, or 95% of the thickness of the main body portion 143. The specific thickness relationship of the flat plate portion 1422 is not uniquely limited here, and can be selected according to actual needs during design.

[0127] In some embodiments, the first connecting portion 141 is welded to the tab 121, and along the first direction, the thickness of the first connecting portion 141 is 35% to 95% of the thickness at other locations of the main body portion 143.

[0128] In this embodiment, the first connecting portion 141 is disposed on the main body portion 143. For example, the first connecting portion 141 is formed in a portion of the main body portion 143 located on both sides of the second connecting portion 142 along the second direction and is welded to the tab 121. The thickness of the first connecting portion 141 is set to 35% to 95% of the thickness of the main body portion 143, so that the first connecting portion 141 has sufficient thickness to maintain the integrity and basic strength of the structure, while the thickness of the first connecting portion 141 is not too thick, which can reduce the welding energy required during welding, reduce the welding difficulty, and reduce the adverse effects of welding heat.

[0129] In a specific embodiment, the thickness of the first connecting portion 141 can be 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, or 95% of the thickness of other positions of the main body portion 143. The specific thickness relationship of the first connecting portion 141 is not uniquely limited here, and can be selected according to actual needs during design.

[0130] In a specific embodiment, it should be noted that the first connecting part 141 and the electrode 121 can be ultrasonically welded or cold-pressed. Ultrasonic welding uses high-frequency vibration to cause plastic deformation and local temperature rise between the contact surfaces of the electrode 121 and the first connecting part 141, thereby achieving a solid connection. Ultrasonic welding has the advantages of a small heat-affected zone, almost no damage to the electrode 121 and the electrode assembly 12, and suitability for welding dissimilar materials and thin materials. It is especially suitable for welding the electrode 121 and the adapter 14.

[0131] In the above embodiments, such as Figure 3 As shown, the first connecting part 141 is welded to the tab 121, and the second connecting part 142 is welded to the electrode terminal 13. Embossing 145 can also be provided on the first connecting part 141 and the second connecting part 142 respectively. Embossing 145 refers to pre-processing a regular texture or pattern on the surface of the material to be welded (usually a metal part) through mechanical stamping, rolling, or other processes. This changes the microstructure of the welding area, forming a non-smooth contact surface, thereby optimizing the welding effect. In a specific embodiment, for example, embossing 145 with a depth of 0.03mm-0.2mm, a size of 0.4mm × 0.4mm, and a distance of 0.5mm between each convex and concave structure can be provided on the flat plate portion 1422 of the first connecting part 141 and the tab 121 to optimize the welding of the first connecting part 141 to the tab 121 and the second connecting part 142 to the electrode terminal 13.

[0132] In some embodiments, such as Figure 2 , Figure 3 and Figure 8 As shown, the adapter 14 also includes at least one ear 144 that protrudes from the side of the adapter 14 in a third direction.

[0133] In this embodiment, a protruding ear 144 is provided on the side of the adapter 14 along a third direction. The ear 144 can be used to cooperate with the groove structure on the external auxiliary structure during the assembly process to limit the movement of the adapter 14 and reduce the risk of movement of the adapter 14 during the assembly process. At the same time, a groove structure adapted to the ear 144 can also be provided on the outer shell 11 of the battery cell 10. The ear 144 and the groove structure on the outer shell 11 cooperate to form a limiting structure for limiting the movement of the adapter 14 after the adapter 14 is installed.

[0134] The adapter 14 including at least one ear 144 means that the adapter 14 includes one or more ear 144, and along a third direction, one side of the adapter 14 is provided with an ear 144, or one side of the adapter 14 is provided with two or more ear 144, or two opposite sides of the adapter 14 are each provided with an ear 144, or two opposite sides of the adapter 14 are each provided with multiple ear 144.

[0135] In a specific embodiment, such as Figure 2 , Figure 3 and Figure 8 As shown, the battery cell 10 includes two adapters 14. Each adapter 14 has an ear 144 on each of its two sides along a third direction. One of the two ears 144 of the same adapter 14 has a chamfer 1441. The ears 144 with chamfer 1441 of the two adapters 14 are located on different sides.

[0136] In this embodiment, the battery cell 10 includes two adapters 14, namely a positive adapter and a negative adapter. The positive adapter has an ear 144 on each side along a third direction, and the negative adapter also has an ear 144 on each side along a third direction. One of the two ears 144 on the positive adapter has a chamfer 1441, and the other one of the two ears 144 on the negative adapter has a chamfer 1441. The two ears 144 with chamfers 1441 are located on opposite sides along a third direction. For example, along a third direction, the ear 144 with chamfers 1441 on the positive adapter is located on the left, and the ear 144 with chamfers 1441 on the negative adapter is located on the right. Thus, the chamfer 1441 serves as a foolproof structure to distinguish between the positive and negative adapters.

[0137] Please refer to the following: Figures 1 to 9 One embodiment of this application provides a battery cell 10, which includes a housing 11 and an electrode assembly 12. The housing 11 includes a shell 101 and a cover 102. The shell 101 is hollow and has an opening 111. The cover 102 is sealed to the shell 101 and covers the opening 111. The cover 102 and the shell 101 form a receiving cavity 112. The electrode assembly 12 is located within the receiving cavity 112 and has tabs 121. The battery cell 10 also includes an adapter 14. The shell 101 has electrode terminals 13. Both the electrode terminals 13 and the adapter 14 are mounted on the cover 102. The electrode terminals 13 are located in the side space of the electrode assembly 12 along a first direction, i.e., the height direction of the battery cell 10.

[0138] The adapter 14 includes a main body 143, a first connecting part 141, and a second connecting part 142. The second connecting part 142 is a protruding structure integrally stamped in the middle region of the main body 143. The second connecting part 142 protrudes towards the electrode terminal 13 along a first direction. The electrode terminal 13 is provided with a groove 131 corresponding to the position of the second connecting part 142. The second connecting part 142 is inserted into the groove 131 along the first direction and welded to the electrode terminal 13. The adapter 14 has two first connecting parts 141. The two first connecting parts 141 are provided on opposite sides of the second connecting part 142 along a second direction, i.e., the width direction of the battery cell 10. The first connecting parts 141 and the second connecting parts 142 are arranged opposite each other at intervals. The second direction is perpendicular to the first direction. The battery cell 10 includes two electrode assemblies 12 arranged in a group. The two first connecting parts 141 on the adapter 14 are respectively welded to the tabs 121 of the two electrode assemblies 12. Wherein, the dimension W1 of the second connecting part 142 along the second direction is smaller than its dimension W2 along the third direction. The second connecting part 142 has a convex elliptical structure. The minor axis of the ellipse is parallel to the second direction, and the major axis of the ellipse is parallel to the third direction. The groove 131 provided on the electrode terminal 13 is an elliptical groove adapted to the second connecting part 142.

[0139] Furthermore, the main body 143 has a first surface 1431 facing the electrode terminal 13, and a second connecting portion 142 protrudes from the first surface 1431. The second connecting portion 142 has a sidewall portion 1421 connected to the first surface 1431, and the angle between the sidewall portion 1421 and the first surface 1431 is 91° to 130°. The thickness d of the sidewall portion 1421 along the second or third direction is four-fifths of the thickness D of the main body 143 along the first direction. The thickness of the first connecting portion 141 is 35% to 95% of the thickness of the main body 143 at other locations. The second connecting portion 142 also has a flat plate portion 1422 connected to the sidewall portion 1421. The flat plate portion 1422 is welded to the groove wall of the groove 131. Along the first direction, the thickness of the flat plate portion 1422 is 35% to 95% of the thickness of the main body 143 (excluding the first connecting portion 141). The battery cell 10 includes two adapters 14, namely a positive adapter and a negative adapter. Each adapter 14 has an ear 144 on each of its two sides along a third direction. One of the two ears 144 on the positive adapter has a chamfer 1441, and one of the two ears 144 on the negative adapter has a chamfer 1441. Along a third direction, the ear 144 with the chamfer 1441 on the positive adapter is located on the left side, and the ear 144 with the chamfer 1441 on the negative adapter is located on the right side.

[0140] In this embodiment, the battery cell 10 has an adapter 14 connected to the tab 121 of the electrode assembly 12 via a first connecting portion 141, and then connected to the electrode terminal 13 via a second connecting portion 142. This allows the tab 121 to be electrically connected to the electrode terminal 13 via the adapter 14, thereby enabling power transmission. The first connecting portion 141 is located on the side of the second connecting portion 142 along the second direction. The size of the second connecting portion 142 in the second direction is smaller than its size in the third direction. The second connecting portion 142 is elliptical in shape. The smaller size of the second connecting portion 142 in the second direction reduces the space occupied by the part connecting the adapter 14 to the electrode terminal 13 in the second direction, thus providing more space for the first connecting portion 141. This allows the adapter 14 to have a relatively larger space for connecting to the tab 121, increasing the connection area between the adapter 14 and the tab 121, increasing the connection strength, and improving the current carrying capacity. Furthermore, the first connecting portion 141 can be positioned as large as possible in the second direction. The closer proximity to the second connection portion 142 helps to shorten the current conduction path from the tab 121 to the electrode terminal 13, reducing internal resistance and improving current transmission efficiency. Furthermore, the second connection portion 142 itself can be expanded in the third direction so that the adapter 14 can still provide sufficient size to connect with the electrode terminal 13, meeting the requirements for a reliable connection between the adapter 14 and the electrode terminal 13. In this way, the connection between the adapter 14 and the tab 121 and the electrode terminal 13 can take into account factors such as connection strength, overcurrent capacity, and internal resistance. The electrical connection stability and reliability between the tab 121 and the electrode terminal 13 of the electrode assembly 12 are improved, and the reliability and stability of the battery cell 10 are also improved accordingly.

[0141] Another embodiment of this application also provides a battery device 100, such as Figure 12 As shown, the battery device 100 includes one or more battery cell assemblies, which provide voltage and capacity. The battery cell assembly may include multiple battery cells 10 provided in any of the above embodiments, and the multiple battery cells 10 are connected in series, parallel, or mixed connection via a busbar.

[0142] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells together.

[0143] As an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells 10 into an independent module. As an example, the battery module can be formed by bundling multiple battery cells 10 together with cable ties.

[0144] In some embodiments, the battery device 100 may be a battery pack, which includes a housing 20 and one or more battery cell assemblies housed in the housing 20.

[0145] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing 20 by fixing the battery module in the housing 20.

[0146] As an example, the battery cell assembly can also be housed in the housing 20 by directly fixing multiple battery cells 10 to the housing 20.

[0147] As an example, the housing 20 may include a first part and a second part. The first part and the second part are fastened together to form a closed space inside the housing 20 for housing the battery cell assembly. Here, "closed" refers to covering or closing, which can be sealed or unsealed. The first part may be a cover 102 or a base plate 22.

[0148] As an example, the housing 20 may include a cover plate 21, a frame, and a base plate 22. The cover plate 21 and the base plate 22 are respectively connected to the frame, so that the interior of the housing 20 forms a closed space to accommodate the battery cell assembly.

[0149] Another embodiment of this application also provides an energy storage device 303, such as Figure 13 As shown, the energy storage device 303 can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. The energy storage device 303 can store electrical energy as needed and output it when appropriate. For example, the energy storage device 303 can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours.

[0150] In some embodiments, the energy storage device 303 may be an energy storage cabinet, an energy storage container, or the like.

[0151] In some embodiments, the energy storage device 303 may include a cabinet 304 and one or more battery clusters housed within the cabinet 304. The one or more battery clusters enhance the voltage and capacity of the energy storage device 303. Each battery cluster may include one or more battery devices 100 as described in the above embodiments. Multiple battery devices 100 are connected in series via a busbar to increase the voltage of the energy storage device 303. When the energy storage device 303 includes multiple battery clusters, these clusters are connected in parallel to increase the capacity of the energy storage device 303. Alternatively, the energy storage device 303 may also include one or more battery devices 100, which are directly housed within the cabinet 304.

[0152] In some embodiments, the energy storage device 303 may include modules such as a thermal management module, a main control module, a central control module, a power distribution module, and a fire protection module.

[0153] As an example, the thermal management module may include a liquid cooling unit that supplies coolant to each battery device 100 via piping for regulating the temperature of the battery device 100.

[0154] As an example, the main control module can serve as the battery management unit for the battery cluster, used to monitor and manage the battery cluster. The main control module can monitor information such as the current, voltage, power, or temperature of the battery cluster. For instance, it can control the charging and discharging current and voltage of the battery cluster. The main control module includes auxiliary battery management units, integrated switches, and other modules.

[0155] As an example, the central control module can serve as the battery management unit of the energy storage device 303, used for monitoring and managing the energy storage device 303. The central control module can monitor information such as the current, voltage, power, state of charge, or temperature of the energy storage device 303. For example, it can control the charging and discharging current and voltage of the energy storage device 303. As an example, the central control module includes modules such as an insulation monitoring module, a main battery management unit, and an Ethernet and fiber optic conversion module.

[0156] As an example, the fire protection module includes a control panel, detectors, alarm devices, etc., used to detect, alarm, or extinguish fires in the energy storage system 300.

[0157] As an example, the power distribution module can be used to distribute power to the modules in the energy storage device 303 that require power.

[0158] Another embodiment of this application also provides an energy storage system 300, such as Figure 14 As shown, the energy storage system 300 may include one or more energy storage devices 303 and power conversion devices provided in the above embodiments. The power conversion device is used to connect between the power generation device and the energy storage device 303. The power generation device is used to generate electrical energy, and the electrical energy generated by the power generation device can be stored in the energy storage device 303 through the power conversion device. As an example, the power generation device may specifically be a solar panel, hydroelectric power generation device, thermal power generation device, wind power generation device, etc. The specific type of power generation device is not limited in this application.

[0159] Another embodiment of this application also provides a charging network 200, such as Figure 15 As shown, the charging network 200 includes a charging pile 201 and an energy storage device 303 provided in the above embodiment. The charging pile 201 is electrically connected to the energy storage device 303, which provides electrical energy to the charging pile 201. The charging pile 201 is electrically connected to a battery device 100 in the energy storage device 303 via a cable, and the battery device 100 can provide its stored electrical energy to the charging pile 201. The charging pile 201 has one or more connectors 202 for connecting to electrical equipment (such as a vehicle) to replenish the power of the electrical equipment.

[0160] The energy storage device 303 can be located inside the charging pile 201 (e.g., an integrated energy storage and charging unit) or outside the charging pile 201.

[0161] In some embodiments, the charging network 200 may include a charging pile 201 and an energy storage system 300 provided in the above embodiments. The charging pile 201 is electrically connected to the energy storage system 300, which provides electrical energy to the charging pile 201. The charging pile 201 is electrically connected to a battery device 100 in the energy storage system 300 via a cable, and the battery device 100 can provide its stored electrical energy to the charging pile 201.

[0162] The description of the various embodiments above tends to emphasize the differences between the various embodiments. The similarities or similarities between them can be referred to, and for the sake of brevity, they will not be repeated here.

[0163] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not 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 modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: The outer casing is equipped with electrode terminals; An electrode assembly is installed inside the housing, and the electrode assembly has tabs; The adapter includes a main body, a first connecting part, and a second connecting part. Both the first connecting part and the second connecting part are disposed on the main body. The first connecting part is connected to the tab, and the second connecting part is connected to the electrode terminal. Wherein, the electrode terminal is located on the side of the electrode assembly along the first direction, the first connecting portion is located on the side of the second connecting portion along the second direction, the dimension of the second connecting portion along the second direction is smaller than the dimension of the second connecting portion along the third direction, the second direction is perpendicular to the third direction and intersects the first direction.

2. The battery cell as described in claim 1, characterized in that, The plane formed by the second direction and the third direction is used as the projection plane, and the orthographic projection of the second connecting part on the projection plane is an ellipse or a rectangle.

3. The battery cell as described in claim 1, characterized in that, Along the second direction, the first connecting portion and the second connecting portion are positioned opposite each other at a distance.

4. The battery cell as described in claim 3, characterized in that, One of the adapters includes two first connecting portions and one second connecting portion. Along the second direction, the second connecting portion is disposed in the middle of the adapter, and the two first connecting portions are respectively disposed on two opposite sides of the second connecting portion.

5. The battery cell according to any one of claims 1 to 4, characterized in that, The first direction is perpendicular to the second direction and the third direction. The second connecting portion protrudes from the main body portion along the first direction toward the electrode terminal. The surface of the electrode terminal toward the adapter is provided with a groove. Along the first direction, at least a portion of the second connecting portion is accommodated in the groove.

6. The battery cell as described in claim 5, characterized in that, With the first direction as the projection direction, the projection of the groove covers the projection of the second connecting part.

7. The battery cell as described in claim 6, characterized in that, The groove can be any one of an elliptical groove, a rectangular groove, a square groove, or a circular groove.

8. The battery cell as described in claim 5, characterized in that, The main body has a first surface facing the electrode terminal, the second connecting portion protrudes from the first surface, the second connecting portion has a side wall portion connected to the first surface, and the angle between the side wall portion and the first surface is greater than 90° and less than or equal to 130°.

9. The battery cell as described in claim 8, characterized in that, The second connecting part is integrally stamped with the main body.

10. The battery cell as described in claim 8, characterized in that, The thickness of the main body portion along the first direction is D, and the thickness of the sidewall portion along the second direction or the third direction is d, where d ≥ 4 / 5 * D.

11. The battery cell as described in claim 8, characterized in that, The second connecting portion further includes a flat plate portion connected to the side wall portion, the flat plate portion being welded to the groove wall of the groove, and the thickness of the flat plate portion being 35% to 95% of the thickness of the main body portion along the first direction; And / or, the first connecting portion is welded to the electrode tab, and along the first direction, the thickness of the first connecting portion is 35% to 95% of the thickness at other locations of the main body portion.

12. The battery cell according to any one of claims 1 to 4, characterized in that, The adapter also includes at least one ear that protrudes from the side of the adapter along the third direction.

13. The battery cell as described in claim 12, characterized in that, The battery cell includes two adapters, each adapter having an ear on each of its two sides along the third direction. One of the two ears of the same adapter has a chamfer, and the chamfered ears of the two adapters are located on different sides.

14. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1 to 13.

15. An energy storage device, characterized in that, It includes a plurality of battery cells as described in any one of claims 1 to 13 or a plurality of battery devices as described in claim 14, wherein the battery cells or the battery devices are used to store or provide electrical energy.

16. An energy storage system, characterized in that, It includes a power conversion device and an energy storage device as described in claim 15, wherein the power conversion device is used to electrically connect the power generation device and the energy storage device.

17. A charging network, characterized in that, It includes a charging pile and an energy storage device as described in claim 15 or an energy storage system as described in claim 16, wherein the energy storage device is used to provide electrical energy to the charging pile.

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