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

Abstract

The present application belongs to the technical field of batteries. Provided are a battery cell, a battery device, an energy storage device, an energy storage system and a charging network. The battery cell comprises a housing, an electrode assembly, and an adapter, wherein the electrode assembly is mounted in the housing and has a tab; the adapter comprises a first connecting portion and a second connecting portion, the first connecting portion being electrically connected to the tab, and the second connecting portion being welded to an electrode terminal. In addition to the welding, the battery cell is further provided with a limiting structure, which is configured to limit relative movement between the electrode terminal and the second connecting portion, further improving the ability to maintain the relative positional stability between the electrode terminal and the adapter, and thereby minimizing the pulling force on the welding position between the adapter and the electrode terminal, lowering the risk of tearing and fracture at the welding position. Thus, the welding strength and stability are effectively ensured, the stability and reliability of the electrical connection between the tab and the electrode terminal are improved, and the stability and reliability of the battery cell during use are enhanced.

Description

Battery cells, battery packs, energy storage devices, energy storage systems and charging networks

[0001] This application incorporates Chinese Patent Application No. 202411620678.X, filed on November 13, 2024, entitled “Battery Cell, Battery Device, Energy Storage Device, Energy Storage System and Charging Network”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] 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

[0003] 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.

[0004] In battery devices, the tabs of the electrode assembly inside the battery cell are usually welded to the electrode terminals located on the top cover via an adapter. The connection strength between the adapter and the electrode terminals affects the reliability of the battery cell. Therefore, how to improve the connection strength between the adapter and the electrode terminals is a key concern in the industry.

[0005] The above statements are for the purpose of providing background information in relation to this application only and do not necessarily constitute prior art. Summary of the Invention

[0006] 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 problem of reduced reliability of battery devices due to the limited connection strength between the adapter and the electrode terminals in related technologies.

[0007] In a first aspect, embodiments of this application provide a single battery cell, comprising:

[0008] The outer casing is equipped with electrode terminals;

[0009] Electrode assembly, installed inside the housing, the electrode assembly has tabs;

[0010] The adapter includes a first connecting portion and a second connecting portion, the first connecting portion being electrically connected to a tab, and the second connecting portion being welded to an electrode terminal; and

[0011] A limiting structure is used to restrict the relative movement between the electrode terminal and the second connection portion.

[0012] In this embodiment of the battery cell, the adapter is electrically connected to the tab of the electrode assembly via a first connecting part, and then welded to the electrode terminal via a second connecting part, thereby enabling the tab to be electrically connected to the electrode terminal through the adapter, achieving power transmission. Furthermore, the battery cell also includes a limiting structure to restrict the relative movement between the electrode terminal and the second connecting part. Thus, by limiting the mutual movement between the electrode terminal and the second connecting part on top of the welding, the ability of the electrode terminal and the adapter to maintain a stable relative position is further improved, thereby reducing the risk of stress concentration at the weld joint caused by relative movement, leading to reduced weld strength or even weld breakage. Therefore, in actual use of the battery cell, such as during transportation and movement, vibration, collisions, or material expansion and contraction due to temperature changes, the limiting structure reduces the tensile force on the weld position between the adapter and the electrode terminal, effectively reducing the risk of tearing or breakage at the weld position. Weld strength and stability are effectively guaranteed, improving the stability and reliability of the electrical connection between the tab and the electrode terminal of the electrode assembly, and ultimately enhancing the stability and reliability of the battery cell in use.

[0013] In some embodiments, the limiting structure includes a first groove and a first protrusion, and the second connecting portion and the electrode terminal are adapted to engage with the first protrusion through the first groove.

[0014] By adopting the technical solution of this embodiment, a first groove and a first protrusion are provided between the second connecting part of the adapter and the electrode terminal for a snap-fit ​​connection. On the basis of welding, the second connecting part of the adapter and the electrode terminal can also achieve a snap-fit ​​connection through the first groove and the first protrusion. In this way, the connection between the adapter and the electrode terminal is more firm and reliable, thereby effectively reducing the risk of relative displacement between the two due to external forces. This provides a guarantee for maintaining reliable and stable welding between the adapter and the electrode terminal, improving the electrical connection stability and reliability between the electrode tab and the electrode terminal of the electrode assembly, and improving the stability and reliability of the battery cell in use.

[0015] In some embodiments, the second connection portion has a first surface facing the electrode terminal, and at least a portion of the first surface is welded to the electrode terminal;

[0016] The first surface is recessed to form a first groove, and the first protrusion is provided on the end face of the electrode terminal facing the first surface, and / or the end face of the electrode terminal facing the first surface is recessed to form a first groove, and the first protrusion is provided on the first surface.

[0017] By adopting the technical solution of this embodiment, a first groove is provided on the first surface where the adapter and the electrode terminal are welded, and correspondingly, a first protrusion is provided on the end face of the electrode terminal facing the first surface. Alternatively, a first protrusion is provided on the first surface where the adapter and the electrode terminal are welded, and correspondingly, a first groove is provided on the end face of the electrode terminal facing the first surface. That is, the limiting structure is provided between the two surfaces where the adapter and the electrode terminal are welded. When the second connecting part is welded to the electrode terminal, the first protrusion is correspondingly inserted into the first groove. The setting of the limiting structure does not occupy additional space, which can reduce the risk of the energy density decreasing due to the increase in the volume of the battery cell caused by the setting of the limiting structure. Furthermore, by setting the limiting structure between the two surfaces where the adapter and the electrode terminal are welded, it can also ensure that the limiting structure can at least restrict the relative movement between the electrode terminal and the second connecting part along the extension direction of the first surface, thereby reducing the probability of shear stress at the welded part and reducing the risk of reduced weld strength or even welded part failure due to shear stress acting on the welded connection part.

[0018] In some embodiments, the limiting structure further includes a second groove provided in the second connection portion, the end of the electrode terminal facing the second connection portion is inserted into the second groove, and at least a portion of the groove wall of the second groove is welded to the electrode terminal.

[0019] By adopting the technical solution of this embodiment, a second groove is provided in the second connecting part of the adapter. The size and shape of the second groove are adapted to the shape and size of the end of the electrode terminal facing the second connecting part. The end of the electrode terminal facing the second connecting part is adapted to be inserted into the second groove provided in the second connecting part. That is, one end of the electrode terminal is inserted into the second connecting part of the adapter. The second connecting part forms a cap-like structure covering one end of the electrode terminal to realize the limiting connection between the adapter and the electrode terminal. The overall setting of the limiting structure is relatively simple. It is sufficient to provide a second groove in the second connecting part of the adapter. The electrode terminal can remain unchanged in its original structure and size. In addition, the part of the electrode terminal inserted into the second groove is welded to the second connecting part. The welding position is set in the second groove, which also helps to improve the welding strength.

[0020] In some embodiments, the second connection portion includes a welding portion and limiting arms connected to at least two opposite sides of the welding portion. The limiting arms and the welding portion surround to form a second groove. At least a portion of the surface of the welding portion facing the electrode terminal is welded to the electrode terminal. The welding portion is disposed opposite the end face of the electrode terminal. The limiting arms are attached to the side of the electrode terminal in a direction perpendicular to the direction of the electrode terminal toward the second connection portion.

[0021] By adopting the technical solution of this embodiment, the end face of the electrode terminal facing the second connecting part is welded to the welding part. On this basis, limiting arms are provided on at least two opposite sides of the welding part. One end of the electrode terminal facing the second connecting part is located between the limiting arms, and the side wall of the electrode terminal is in contact with the limiting arm, that is, there is almost no gap between the limiting arm and the side wall of the electrode terminal. This makes it almost impossible for the adapter and the electrode terminal to move relative to each other. In this way, the probability of shear stress occurring at the tensile welding part can be effectively reduced, and an effective guarantee can be provided for maintaining a stable and reliable connection between the adapter and the electrode terminal.

[0022] In some embodiments, the limiting arm and the welding part are integrally formed.

[0023] By adopting the technical solution of this embodiment, the limiting arm and the welding part can be directly connected to the electrode terminal as an integral structure without assembly. The overall structure of the adapter is simple, the molding method is simple, and it is easy to mass-produce. Furthermore, the welding arm and the welding part are integrally formed, and the relative position and dimensional accuracy between the two are better controlled. The size and accuracy of the insertion positioning between the two and the electrode terminal are also better controlled, making the limiting achieved by the insertion between the two more reliable and effective.

[0024] In some embodiments, the housing includes a housing and a top cover connected to the housing. Electrode terminals are disposed on the top cover. The top cover is also provided with an insulating member for electrically isolating the top cover and the electrode terminals, and for electrically isolating the top cover and the adapter. The limiting structure also includes a second protrusion disposed on the insulating member in a direction perpendicular to the direction of the electrode terminals toward the second connection portion. The second protrusion is attached to opposite sides of the electrode terminals, and the limiting arm is connected to the second protrusion.

[0025] By adopting the technical solution of this embodiment, the insulating component is provided with a second protrusion, which forms part of the limiting structure. The second protrusion is attached to the opposite sides of the electrode terminal, and the limiting arm is connected to the second protrusion. That is, the second connecting part is connected to the insulating component through the connection of the limiting arm and the second protrusion. In this way, the adapter, the electrode terminal, the insulating component and the top cover can form a tightly connected whole, which further improves the ability to resist external forces and further reduces the probability of relative displacement between the adapter and the electrode terminal.

[0026] In some embodiments, the second protrusion is clamped between the limiting arm and the electrode terminal.

[0027] By adopting the technical solution of this embodiment, the second protrusion is sandwiched between the electrode terminal and the limiting arm. That is, the second protrusion, together with one end of the electrode terminal, is inserted into the first groove of the second connecting part. The hardness and rigidity of the insulating part are generally lower than those of the electrode terminal. During the design, elastic materials such as rubber can also be selected to make the insulating part. In this way, the second connecting part forms a cap-like structure that is fastened to the second protrusion of the insulating part. The limiting arm is directly attached to the second protrusion, and the two can have a better fit and the insertion connection is more firm and reliable.

[0028] In some embodiments, a first gap exists between the bottom surface of the second protrusion and the surface of the welding portion along the direction of the electrode terminal toward the second connection portion.

[0029] By adopting the technical solution of this embodiment, there is a gap between the second protrusion and the welding part, that is, along the direction of the electrode terminal toward the second connection part, the second protrusion does not protrude relative to the electrode terminal, the second protrusion will not interfere with the welding between the welding part and the electrode terminal, and the surface of the welding part can always be in close contact with the end face of the electrode terminal for welding, that is, the setting of the limiting structure will not have an adverse effect on the welding connection between the adapter and the electrode terminal.

[0030] In some embodiments, the width of the first gap is 0.3 mm to 0.8 mm.

[0031] In some embodiments, the limiting structure further includes a third protrusion disposed on the insulating member, in a direction perpendicular to the direction of the electrode terminal toward the second connection portion, the third protrusion being spaced apart from the side portions of the second protrusion, and the limiting arm being clamped between adjacent second and third protrusions.

[0032] By adopting the technical solution of this embodiment, the insulating component is provided with a second protrusion and a third protrusion spaced apart from each other. The limiting arm is adapted to snap between two adjacent second protrusions and third protrusions. Thus, by providing the second protrusion and the third protrusion, it is equivalent to forming a slot in the insulating component. The second connecting part of the adapter can be engaged with the slot through the limiting arm, thereby enabling the adapter to be snapped and connected to the insulating component through the limiting structure. The adapter, electrode terminal, insulating component and top cover can form a tightly connected whole, further improving the ability to resist external forces and further reducing the probability of relative displacement between the adapter and the electrode terminal.

[0033] In some embodiments, the housing includes a housing and a top cover connected to the housing, an electrode terminal is disposed on the top cover, the top cover is further provided with an insulating member for electrically isolating the top cover and the electrode terminal, and electrically isolating the top cover and the adapter, the limiting structure includes a fourth protrusion disposed on the insulating member in a direction perpendicular to the direction of the electrode terminal toward the second connection portion, the fourth protrusion being located on at least two opposite sides of the electrode terminal in the direction of the electrode terminal toward the second connection portion, the fourth protrusion having a portion extending beyond the electrode terminal, the fourth protrusion and the electrode terminal surrounding to form a third groove, the second connection portion being fitted into the third groove.

[0034] By adopting the technical solution of this embodiment, the limiting structure also includes a fourth protrusion on the insulating member. The fourth protrusion has a portion that extends beyond the electrode terminal. The extended portion and the electrode terminal surround to form a third groove. The second connecting portion is embedded in the third groove. That is, the fourth protrusion extends to at least two sides of the second connecting portion. In this way, at least two sides of the second connecting portion can be limited by the fourth protrusion. Since the position of the insulating member relative to the electrode terminal is fixed, the fourth protrusion on the insulating member limits the second connecting portion of the adapter, which can also reduce the risk of the adapter moving relative to the electrode terminal due to external force, thereby reducing the risk of relative movement between the adapter and the electrode terminal.

[0035] In some embodiments, the portion of the fourth protrusion extending beyond the electrode terminal is at least half the thickness of the second connection portion.

[0036] By adopting the technical solution of this embodiment, the size of the portion of the fourth protrusion that extends beyond the electrode terminal is greater than or equal to half the thickness of the second connection portion, so as to ensure that the fourth protrusion can effectively limit the second connection portion from the side of the second connection portion.

[0037] In some embodiments, the fourth protrusion is provided with a barb that abuts against the side of the second connection portion away from the electrode terminal along the direction of the electrode terminal toward the second connection portion, and the second connection portion is sandwiched between the barb and the electrode terminal.

[0038] By adopting the technical solution of this embodiment, a barb is provided on the fourth protrusion, and the second connecting part is sandwiched between the barb and the electrode terminal. The barb enables the second connecting part to be better attached to the electrode terminal, thereby further limiting the movement of the second connecting part, so as to further improve the welding stability and reliability of the second connecting part and the electrode terminal.

[0039] In some embodiments, the fourth protrusion is an elastic protrusion that clamps the second connecting portion.

[0040] By adopting the technical solution of this embodiment, the fourth protrusion is set as an elastic protrusion, which is adapted to clamp the second connecting part so that the fourth protrusion can effectively limit the second connecting part.

[0041] In some embodiments, in a direction perpendicular to the direction of the electrode terminal toward the second connection portion, each fourth protrusion has a second gap between itself and the sidewall of the adjacent second connection portion, the width of the second gap being less than or equal to 0.5 mm.

[0042] By adopting the technical solution of this embodiment, the gap between the fourth protrusion and the sidewall of the adjacent second connecting part is set to a maximum of 0.5mm, so that the fourth protrusion can effectively limit the second connecting part.

[0043] In some embodiments, the fourth protrusion is an annular protrusion, or the insulating member is provided with a plurality of fourth protrusions, and at least two fourth protrusions are respectively disposed on opposite sides of the second connecting portion.

[0044] By adopting the technical solution of this embodiment, the fourth protrusion can be a continuous annular protrusion. During assembly, the second connecting part can be inserted into the space defined by the annular protrusion. Alternatively, the insulating part can also be provided with multiple fourth protrusions. During assembly, the second connecting part can be inserted between the multiple fourth protrusions. Furthermore, at least two of the multiple fourth protrusions are arranged opposite each other at intervals to limit the second connecting part from opposite sides.

[0045] Secondly, embodiments of this application provide a battery device including a plurality of battery cells as described in the above embodiments.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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

[0050] 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.

[0051] Figure 1 is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0052] Figure 2 is an exploded view of the battery cell shown in Figure 1;

[0053] Figure 3 is a cross-sectional view of a partial structure of a battery cell in some embodiments;

[0054] Figure 4 is a cross-sectional view of a partial structure of a battery cell in some other embodiments;

[0055] Figure 5 is a cross-sectional view of a partial structure of a battery cell in some other embodiments;

[0056] Figure 6 is a cross-sectional view of a partial structure of a battery cell in some embodiments;

[0057] Figure 7 is another view of the battery cell shown in Figure 1;

[0058] Figure 8 is a cross-sectional view along line AA in Figure 7;

[0059] Figure 9 is a schematic diagram of the structure of the adapter for the battery cell shown in Figure 1;

[0060] Figure 10 is a cross-sectional view along line BB in Figure 7;

[0061] Figure 11 is a cross-sectional view of a partial structure of a battery cell in some embodiments;

[0062] Figure 12 is a schematic diagram of the structure shown in Figure 11, showing only the top cover assembly;

[0063] Figure 13 is a cross-sectional view of a partial structure in a battery cell in some embodiments;

[0064] Figure 14 is an exploded view of a battery cell provided in some other embodiments;

[0065] Figure 15 is a partial structural schematic diagram of the insulating component of the battery cell shown in Figure 14;

[0066] Figure 16 is a perspective view of a battery cell provided in some other embodiments;

[0067] Figure 17 is a cross-sectional view along line CC in Figure 16;

[0068] Figure 18 is a cross-sectional view of a partial structure of a battery cell in some embodiments;

[0069] Figure 19 is a schematic diagram of the structure shown in Figure 18, showing only the top cover assembly;

[0070] Figure 20 is a cross-sectional view of a partial structure of a battery cell in some embodiments;

[0071] Figure 21 is an exploded structural diagram of a battery device according to some embodiments of this application;

[0072] Figure 22 is a schematic diagram of the structure of an energy storage device according to some embodiments of this application;

[0073] Figure 23 is a schematic diagram of the structure of an energy storage system according to some embodiments of this application;

[0074] Figure 24 is a schematic diagram of the structure of a charging network according to some embodiments of this application.

[0075] The main markings in the attached figures are as follows: 10, battery cell; 11, casing; 101, housing; 111, opening; 112, receiving cavity; 12, electrode assembly; 121, tab; 13. Top cover assembly; 131. Electrode terminal; 132. Adapter; 1321. First connecting part; 1322. Second connecting part; 1324. Welding part; 1325. Limiting arm; 1326. First gap; 133. Limiting structure; 1331. First groove; 1332. First protrusion; 1333. Second protrusion; 1334. Third protrusion; 1335. Fourth protrusion; 1336. Barb; 1337. Second gap; 1338. Second groove; 1339. Third groove; 134. Top cover; 1341. Mounting hole; 135. Insulating component; 1351. Lower plastic; 1352. Upper plastic; 1353. Pressure ring; 100. Battery assembly; 20. Housing; 201. Accommodation space; 21. Cover plate; 22. Base plate; 200. Charging network; 201. Charging pile; 202. Connector; 300. Energy storage system; 301. Power conversion device; 302. Power generation device; 303. Energy storage device; 304. Cabinet. Detailed Implementation

[0076] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the application will be further described in detail below with reference to Figures 1 to 24 and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0081] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] A battery cell, as the smallest unit that makes up a battery, typically includes a casing and an electrode assembly. The electrode assembly has tabs and is located inside the casing. The casing also has electrode terminals. The tabs of the electrode assembly are connected to the electrode terminals to realize the input and output of electrical energy.

[0090] In related technologies, the adapter is used to weld the tabs and terminals of the electrode assembly. In actual production, the area available for welding between the electrode terminals and the adapter is small. Furthermore, the welding strength between the adapter and the electrode terminals is limited due to welding processes and conditions. During transportation and use, the battery experiences vibrations under external forces, and temperature changes cause thermal expansion and contraction of internal components within the battery cell. These factors can cause relative movement or a tendency for relative movement between the electrode terminals and the adapter. This relative movement or tendency generates shear force at the welding point between the adapter and the electrode terminals, causing the welded area to be stretched. This reduces the welding strength, leading to loosening of the welded area, increased connection resistance, and, in cases of excessive relative movement, even breakage of the welded area, resulting in welding failure and complete detachment of the electrode terminals from the adapter. Consequently, the electrical connection between the adapter and the electrode terminals fails, preventing the electrode assembly from charging and discharging normally, severely impacting the battery's reliability and stability, and ultimately causing electrical connection failure.

[0091] Based on this, this application provides a battery cell. By providing a first connecting part and a second connecting part in an adapter, electrically connecting the first connecting part to the tab of the electrode assembly, and then welding the second connecting part to the electrode terminal, the tab can be electrically connected to the electrode terminal through the adapter, thus realizing power transmission. Furthermore, the battery cell also includes a limiting structure that restricts the relative movement between the electrode terminal and the second connecting part. Thus, by limiting the mutual movement between the electrode terminal and the second connecting part on top of the welding, the ability of the electrode terminal and the adapter to maintain a stable relative position is further improved, thereby reducing the risk of stress concentration at the welded joint caused by relative movement, leading to reduced weld strength or even weld fracture failure. Thus, in actual use of battery cells, such as during transportation and movement, vibration, collision, or material expansion and contraction due to temperature changes, the limiting structure can reduce the tensile force on the welding position between the adapter and the electrode terminal, thereby effectively reducing the risk of tearing or breakage at the welding position. The welding strength and welding stability are effectively guaranteed, the electrical connection stability and reliability between the electrode assembly tab and the electrode terminal are improved, and the stability and reliability of the battery cell in use are improved.

[0092] The battery cell of this application will be described in detail below with reference to Figures 1 to 20 and specific embodiments. The direction of the electrode terminal toward the second connection portion is indicated by the double-headed arrow F1 in the figures, and the direction perpendicular to the direction of the electrode terminal toward the second connection portion is indicated by the double-headed arrow F2 in the figures. Furthermore, the axial direction of the mounting hole is the same as the direction of the electrode terminal toward the second connection portion, and the radial direction of the mounting hole is perpendicular to the direction of the electrode terminal toward the second connection portion.

[0093] As shown in Figures 1 to 3, and Figures 7 and 8, this application embodiment provides a battery cell 10, which includes a housing 11, an electrode assembly 12, and an adapter 132. The housing 11 is provided with electrode terminals 131, the electrode assembly 12 is installed inside the housing 11, and the electrode assembly 12 has tabs 121. The adapter 132 includes a first connecting portion 1321 and a second connecting portion 1322. The first connecting portion 1321 is electrically connected to the tabs 121, and the second connecting portion 1322 is welded to the electrode terminals 131. The battery cell 10 also includes a limiting structure 133, which is used to limit the relative movement between the electrode terminals 131 and the second connecting portion 1322.

[0094] 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.

[0095] 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.

[0096] In some embodiments, the battery cell 10 may be in the shape of a cuboid, cylinder, prism, flattened or other shapes.

[0097] As shown in Figures 1 and 2, in this embodiment, the battery cell 10 includes a housing 11 and an electrode assembly 12. The housing 11 is the external structure of the battery cell 10, providing installation space for the electrode assembly 12 and protecting it, while also providing the 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.

[0098] In this embodiment, the electrode assembly 12 is installed inside the housing 11. It is the core part of the battery cell 10 where electrochemical reactions occur 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.

[0099] 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, they can be arranged sequentially along the width direction of the housing 11, or sequentially along the length direction of the housing 11, or arranged sequentially 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.

[0100] In this embodiment of the application, as shown in Figures 1 and 2, the housing 11 is provided with electrode terminals 131, and the battery cell 10 also includes an adapter 132. The electrode terminals 131 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 132 acts as a bridge between the electrode assembly 12 and the electrode terminals 131, and is used to realize the electrical connection between the electrode assembly 12 and the electrode terminals 131.

[0101] In some embodiments, the electrode assembly 12 has a positive tab and a negative tab, the electrode terminal 131 includes a positive terminal and a negative terminal, and the adapter 132 includes a positive adapter and a negative adapter. The positive adapter connects the positive tab and the positive terminal, and the negative adapter connects the negative terminal and the negative tab. In subsequent embodiments, for ease of description, the positive and negative electrode pieces are collectively referred to as electrode pieces, the positive and negative tabs are collectively referred to as tab 121, the positive and negative adapters are collectively referred to as adapter 132, and the positive and negative terminals are collectively referred to as electrode terminals 131.

[0102] In this embodiment of the application, as shown in Figures 2, 7, and 8, the adapter 132 includes a first connecting portion 1321, which is electrically connected to the tab 121, thereby enabling the transmission of electrical energy between the adapter 132 and the tab 121. Specifically, the first connecting portion 1321 can be directly or indirectly connected to the tab 121. Exemplarily, the first connecting portion 1321 is welded to the tab 121, or the first connecting portion 1321 is riveted or crimped to the tab 121, etc.

[0103] In this embodiment of the application, as shown in Figures 2, 3, and 8, the adapter 132 further includes a second connecting portion 1322 connected to the first connecting portion 1321, and the second connecting portion 1322 is welded to the electrode terminal 131. Exemplarily, the second connecting portion 1322 has a first surface facing the electrode terminal 131, which is located directly below the bottom end of the electrode terminal 131 and is welded to the bottom end face of the electrode terminal 131. The welding can be performed using laser welding, resistance welding, etc. Laser welding features high precision and high energy density, enabling the formation of high-quality welds in a short time, making it particularly suitable for small battery cells 10 where high welding precision is required. 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.

[0104] In this embodiment, the battery cell 10 is further provided with a limiting structure 133. The limiting structure 133 is used to restrict the relative movement between the electrode terminal 131 and the second connecting portion 1322, so as to improve the stability of the relative position between the electrode terminal 131 and the adapter 132. The limiting structure 133 is used to restrict the relative movement between the electrode terminal 131 and the second connecting portion 1322 of the adapter 132. For example, the limiting structure 133 can connect the electrode terminal 131 and the second connecting portion 1322 of the adapter 132 in the form of a snap or a slot. Alternatively, the limiting structure 133 can also be set on the possible path of movement of the electrode terminal 131 or the second connecting portion 1322 of the adapter 132 under external force, thereby preventing the electrode terminal 131 or the second connecting portion 1322 from moving along this path. Thus, the limiting structure 133 acts as a constraint structure to constrain the relative movement between the second connecting portion 1322 and the electrode terminal 131, thereby enabling the electrode terminal 131 and the second connecting portion 1322 of the adapter 132 to maintain a stable relative position, thereby reducing the risk of relative movement between the adapter 132 and the electrode terminal 131.

[0105] Thus, in this embodiment of the battery cell 10, the adapter 132 is electrically connected to the tab 121 of the electrode assembly 12 via the first connecting part 1321, and then welded to the electrode terminal 131 via the second connecting part 1322, thereby enabling the tab 121 to be electrically connected to the electrode terminal 131 via the adapter 132, realizing power transmission. Furthermore, the battery cell 10 is also provided with a limiting structure 133, which restricts the relative movement between the electrode terminal 131 and the second connecting part 1322. Thus, by limiting the mutual movement between the electrode terminal 131 and the second connecting part 1322 on the basis of welding, the limiting structure 133 further improves the ability of the electrode terminal 131 and the adapter 132 to maintain a stable relative position, thereby reducing the risk of stress concentration at the welded joint due to relative movement, leading to reduced weld strength or even welded joint breakage and failure. Thus, in actual use of the battery cell 10, such as during transportation and movement, vibration, collision, or material expansion and contraction caused by temperature changes, the setting of the limiting structure 133 can reduce the tensile force on the welding position between the adapter 132 and the electrode terminal 131, thereby effectively reducing the risk of tearing or breakage at the welding position, effectively ensuring welding strength and welding stability, improving the electrical connection stability and reliability between the tab 121 of the electrode assembly 12 and the electrode terminal 131, and improving the stability and reliability of the battery cell 10 in use.

[0106] In some embodiments, as shown in Figures 3 to 6, the limiting structure 133 includes a first groove 1331 and a first protrusion 1332, and the second connecting portion 1322 and the electrode terminal 131 are adapted and snapped together by the first groove 1331 and the first protrusion 1332.

[0107] Understandably, the second connecting part 1322 and the electrode terminal 131 being adapted and engaged by the first groove 1331 and the first protrusion 1332 means that the first groove 1331 can be provided in the second connecting part 1322, and correspondingly, the first protrusion 1332 can be provided in the electrode terminal 131. Alternatively, the first protrusion 1332 can be provided in the second connecting part 1322, and correspondingly, the first groove 1331 can be provided in the electrode terminal 131. In this way, the second connecting part 1322 and the electrode terminal 131 can be engaged and connected by the first protrusion 1332 and the first groove 1331 engaging.

[0108] In this embodiment, a first groove 1331 and a first protrusion 1332 are provided between the second connecting portion 1322 of the adapter 132 and the electrode terminal 131 for a snap-fit ​​connection. Based on welding, the second connecting portion 1322 of the adapter 132 and the electrode terminal 131 can also achieve a snap-fit ​​connection through the first groove 1331 and the first protrusion 1332. In this way, the connection between the adapter 132 and the electrode terminal 131 is more firm and reliable, thereby effectively reducing the risk of relative displacement between the two due to external forces. This provides a guarantee for maintaining reliable and stable welding between the adapter 132 and the electrode terminal 131, improving the stability and reliability of the electrical connection between the tab 121 of the electrode assembly 12 and the electrode terminal 131, and improving the stability and reliability of the battery cell 10 in use.

[0109] In some embodiments, as shown in Figures 3 to 6, the second connecting portion 1322 has a first surface facing the electrode terminal 131, at least a portion of the first surface is welded to the electrode terminal 131; the first surface is recessed to form a first groove 1331, a first protrusion 1332 is provided on the end face of the electrode terminal 131 facing the first surface, and / or, the end face of the electrode terminal 131 facing the first surface is recessed to form the first groove 1331, and the first protrusion 1332 is provided on the first surface.

[0110] Thus, a first groove 1331 is provided on the first surface where the adapter 132 is welded to the electrode terminal 131, and correspondingly, a first protrusion 1332 is provided on the end face of the electrode terminal 131 facing the first surface. Alternatively, a first protrusion 1332 is provided on the first surface where the adapter 132 is welded to the electrode terminal 131, and correspondingly, a first groove 1331 is provided on the end face of the electrode terminal 131 facing the first surface. That is, the limiting structure 133 is provided between the two surfaces where the adapter 132 and the electrode terminal 131 are welded. When the second connecting part 1322 is welded to the electrode terminal 131, the first protrusion 1332 is correspondingly engaged with the first groove. Within 1331, the setting of the limiting structure 133 does not occupy additional space, which can reduce the risk of the energy density decreasing due to the increase in volume of the battery cell 10 caused by the setting of the limiting structure 133; furthermore, by setting the limiting structure 133 between the two surfaces where the adapter 132 and the electrode terminal 131 are welded, it can also ensure that the limiting structure 133 can at least restrict the relative movement between the electrode terminal 131 and the second connecting part 1322 along the extension direction of the first surface, thereby reducing the probability of shear stress at the welding part and reducing the risk of reduced welding strength or even welding failure due to shear stress acting on the welding connection part.

[0111] In one example, as shown in Figures 3 and 4, a first groove 1331 is formed by a recess in the first surface, and a first protrusion 1332 is provided on the end face of the electrode terminal 131 facing the first surface.

[0112] In another example, as shown in Figures 5 and 6, the end face of the electrode terminal 131 facing the first surface is recessed to form a first groove 1331, and a first protrusion 1332 is provided on the first surface.

[0113] In other examples, the first surface and the end face of the electrode terminal 131 facing the first surface are both provided with a first groove 1331, and the end face of the electrode terminal 131 facing the first surface and the first surface are both provided with a first protrusion 1332, and each first protrusion 1332 engages with the corresponding first groove 1331.

[0114] In other embodiments, as shown in Figures 7, 9 to 11, the limiting structure 133 further includes a second groove 1338 provided in the second connecting portion 1322, the end of the electrode terminal 131 facing the second connecting portion 1322 is inserted into the second groove 1338, and at least a portion of the groove wall of the second groove 1338 is welded to the electrode terminal 131.

[0115] It should be noted that when the end of the electrode terminal 131 facing the second connecting portion 1322 is inserted into the second groove 1338, it means that the electrode terminal 131 has an end facing the second connecting portion 1322, which is directly opposite the second groove 1338 and has a size and shape that are approximately the same as the size and shape of the second groove 1338, so that it can be fitted and snapped into the second groove 1338. At least a portion of the groove wall of the second groove 1338 is welded to the electrode terminal 131. This can be a partial welding of the groove wall of the second groove 1338 to the electrode terminal 131, such as welding the bottom wall of the second groove 1338 to the bottom wall of the electrode terminal 131, or welding the side wall of the second groove 1338 to the side wall of the electrode terminal 131, etc. Alternatively, the entire groove wall of the second groove 1338 can be used for welding to the electrode terminal 131, that is, welding the bottom wall of the second groove 1338 to the bottom wall of the electrode terminal 131 and welding the side wall of the second groove 1338 to the side wall of the electrode terminal 131.

[0116] In this embodiment, a second groove 1338 is provided in the second connecting portion 1322 of the adapter 132. The size and shape of the second groove 1338 are adapted to the shape and size of the end of the electrode terminal 131 facing the second connecting portion 1322. The end of the electrode terminal 131 facing the second connecting portion 1322 is adapted to be inserted into the second groove 1338 provided in the second connecting portion 1322. That is, one end of the electrode terminal 131 is inserted into the second connecting portion 1322 of the adapter 132, and the second connecting portion 1322 forms a cap shape. The structure is covered at one end of the electrode terminal 131 to realize the limiting connection between the adapter 132 and the electrode terminal 131. The overall configuration of the limiting structure 133 is relatively simple. A second groove 1338 is provided in the second connecting part 1322 of the adapter 132. The electrode terminal 131 can remain unchanged in its original structure and size. In addition, the part of the electrode terminal 131 inserted into the second groove 1338 is welded to the second connecting part 1322. The welding position is set in the second groove 1338, which also helps to improve the welding strength.

[0117] In a specific embodiment, the second connecting portion 1322 has a surface facing the electrode terminal 131, and the second groove 1338 can be a recess formed by recessing downward from the surface away from the electrode terminal 131. For example, the second connecting portion 1322 of the adapter 132 can be perforated to form the aforementioned second groove 1338.

[0118] In other embodiments, as shown in Figures 9 to 11, the second connecting portion 1322 includes a welding portion 1324 and limiting arms 1325 connected to at least two opposite sides of the welding portion 1324. The limiting arms 1325 and the welding portion 1324 surround to form a second groove 1338. The welding portion 1324 is disposed opposite to the end face of the electrode terminal 131. At least a portion of the surface of the welding portion 1324 facing the electrode terminal 131 is welded to the electrode terminal 131. The limiting arms 1325 are attached to the side of the electrode terminal 131 in a direction perpendicular to the direction of the electrode terminal 131 toward the second connecting portion 1322.

[0119] In this embodiment, the second connection portion 1322 includes a welding portion 1324, which is disposed opposite to the bottom surface of the electrode terminal 131. Part or all of the surface of the welding portion 1324 facing the electrode terminal 131 is used for welding to the electrode terminal 131.

[0120] In this embodiment, the second connecting portion 1322 further includes limiting arms 1325. The limiting arms 1325 are connected to at least two opposite sides of the welding portion 1324, and are affixed to at least two opposite sides of the electrode terminal 131 in a direction perpendicular to the direction from the electrode terminal 131 toward the second connecting portion 1322. For example, the second connecting portion 1322 may include two limiting arms 1325, each connected to opposite sides of the welding portion 1324, and affixed to two opposite sides of the electrode terminal 131 in a direction perpendicular to the direction from the electrode terminal 131 toward the second connecting portion 1322; or, the second connecting portion 1322 may include two or more limiting arms 1325, wherein two of the limiting arms 1325 are connected to opposite sides of the welding portion 1324. On the side, in a direction perpendicular to the direction of the electrode terminal 131 toward the second connecting portion 1322, two limiting arms 1325 connected to the opposite sides of the welding portion 1324 are respectively attached to the opposite two sides of the electrode terminal 131; or, the limiting arm 1325 may also be an annular arm arranged around the welding portion 1324, in a direction perpendicular to the direction of the electrode terminal 131 toward the second connecting portion 1322, the annular limiting arm 1325 surrounds and is attached to the side of the electrode terminal 131.

[0121] Thus, in this embodiment, the end face of the electrode terminal 131 facing the second connecting portion 1322 is welded to the welding portion 1324. On this basis, limiting arms 1325 are provided on at least two opposite sides of the welding portion 1324. One end of the electrode terminal 131 facing the second connecting portion 1322 is located between the limiting arms 1325. Furthermore, along a direction perpendicular to the direction of the electrode terminal 131 facing the second connecting portion 1322, the sidewall of the electrode terminal 131 is in contact with the limiting arm 1325. That is, there is almost no gap between the limiting arm 1325 and the sidewall of the electrode terminal 131, and there is almost no mutual movement between the adapter 132 and the electrode terminal 131. In this way, the probability of shear stress occurring at the tensile welding part can be effectively reduced, providing an effective guarantee for maintaining a stable and reliable connection between the adapter 132 and the electrode terminal 131.

[0122] In some embodiments, the limiting arm 1325 and the welding part 1324 are integrally formed.

[0123] Thus, the limiting arm 1325 and the welding part 1324 can be directly connected to the electrode terminal 131 as a whole structure without assembly. The overall structure of the adapter 132 is simple, the molding method is simple, and it is easy to mass-produce. Furthermore, the welding arm and the welding part 1324 are integrally formed, and the relative position and dimensional accuracy between the two are better controlled. The size and accuracy of the insertion positioning between the two and the electrode terminal 131 are also better controlled, making the limiting achieved by the insertion between the two more reliable and effective.

[0124] The integral molding of the limiting arm 1325 and the welding part 1324 refers to the formation of a single whole through a continuous manufacturing process, without subsequent assembly steps. For example, the limiting arm 1325 and the welding part 1324 can be integrally molded using processes such as casting, stamping, and forging.

[0125] In some embodiments, as shown in Figures 9, 10 and 11, the housing 11 includes a housing 101 and a top cover 134. The electrode terminal 131 is mounted on the top cover 134. The top cover 134 is also provided with an insulating member 135. The insulating member 135 is used to electrically isolate the top cover 134 and the electrode terminal 131, and to electrically isolate the top cover 134 and the adapter 132. The limiting structure 133 also includes a second protrusion 1333 provided on the insulating member 135. The second protrusion 1333 is attached to opposite sides of the electrode terminal 131 in a direction perpendicular to the direction of the electrode terminal 131 toward the second connecting portion 1322. The limiting arm 1325 is connected to the second protrusion 1333.

[0126] In this embodiment, as shown in Figures 2, 8 and 10, the outer casing 11 includes a housing 101 and a top cover 134. The housing 101 is hollow inside and has an opening 111. The top cover 134 is sealed to the opening 111 of the housing 101 and forms a receiving cavity 112 with the housing 101. After the electrode assembly 12 is installed into the receiving cavity 112 through the opening 111, it is isolated from the external environment by the top cover 134. The electrode terminal 131 is installed on the top cover 134.

[0127] Understandably, in other embodiments, the electrode terminal 131 may also be disposed at other locations on the housing 101, for example, on the bottom wall of the housing 101 opposite to the top cover 134.

[0128] In this embodiment, the top cover 134 is also provided with an insulating member 135, which electrically isolates the top cover 134 and the electrode terminal 131, as well as the electrically isolated top cover 134 and the adapter 132, so as to reduce the risk of internal short circuit of the battery cell 10. Meanwhile, the insulating member 135 is provided with a second protrusion 1333, which forms part of the limiting structure 133. The second protrusion 1333 is attached to the opposite sides of the electrode terminal 131 in a direction perpendicular to the direction of the electrode terminal 131 toward the second connecting part 1322. The limiting arm 1325 is connected to the second protrusion 1333. That is, the second connecting part 1322 is connected to the insulating member 135 through the connection of the limiting arm 1325 and the second protrusion 1333. In this way, the adapter, the electrode terminal 131, the insulating member 135 and the top cover 134 can form a tightly connected whole, which further improves the ability to resist external forces and further reduces the probability of relative displacement between the adapter 132 and the electrode terminal 131.

[0129] Understandably, in this embodiment, the limiting arm 1325 can be connected to the second protrusion 1333 by means of snap-fit, fastening, insertion or bonding.

[0130] The top cover 134 is connected to the housing 101 and is adapted to the sealing opening 111, thereby providing a relatively closed environment for the inside of the device and protecting the internal components from external dust, moisture and other factors. Exemplarily, the top cover 134 can be connected to the housing 101 by welding, snap-fitting or bonding.

[0131] Both the electrode terminal 131 and the insulating member 135 are mounted on the top cover 134. A portion of the insulating member 135 is located between the top cover 134 and the electrode terminal 131 to achieve electrical isolation between the top cover 134 and the electrode terminal 131, thereby preventing the top cover 134 from being electrically connected to the electrode terminal 131 and causing a short circuit in the battery cell 10. Another portion of the insulating member 135 is located between the top cover 134 and the limiting arm 1325 to electrically isolate the top cover 134 and the adapter 132, thereby preventing the top cover 134 from being electrically connected to the adapter 132 and causing a short circuit in the battery cell 10.

[0132] In a specific embodiment, the top cover 134 can be assembled with the electrode terminal 131, the insulating part 135 and the adapter 132 to form a top cover assembly 13. The top cover assembly 13 is connected to the housing 101 as a whole. When connecting, the first connecting part 1321 of the adapter 132 is welded to the electrode tab 121, and the top cover 134 is sealed to the opening 111 of the housing 101.

[0133] In a specific embodiment, as shown in Figures 8, 10, and 11, the top cover 134 is provided with a mounting hole 1341. A portion of the electrode terminal 131 is engaged with the mounting hole 1341. The insulating member 135 includes a main body. A portion of the main body is disposed between the electrode terminal 131 and the top cover 134 along the axial direction of the mounting hole 1341. Another portion of the main body is disposed between the top cover 134 and the limiting arm 1325 along the axial direction of the mounting hole 1341, so as to electrically isolate the limiting arm 1325 and the top cover 134.

[0134] In some embodiments, the second protrusion 1333 is sandwiched between the limiting arm 1325 and the electrode terminal 131.

[0135] The second protrusion 1333 is sandwiched between the electrode terminal 131 and the limiting arm 1325. The second protrusion 1333, together with one end of the electrode terminal 131, is inserted into the first groove 1331 of the second connecting part 1322. The hardness and rigidity of the insulating part 135 are generally lower than those of the electrode terminal 131. During the design, elastic materials such as rubber can also be selected to make the insulating part 135. In this way, the second connecting part 1322 forms a cap-like structure that is fastened to the second protrusion 1333 of the insulating part 135. The limiting arm 1325 is directly attached to the second protrusion 1333, which can have a better fit and the insertion connection is more secure and reliable.

[0136] In a specific embodiment, the insulating member 135 may include the aforementioned main body portion. Along the direction from the electrode terminal 131 toward the second connecting portion 1322, the insulating member 135 also has a second protrusion 1333 protruding from the main body portion, which forms part of the limiting structure 133. The limiting arm 1325 is located in the space between the second protrusion 1333 and the main body portion, and the insulation reliability between the limiting arm 1325 and the top cover 134 is also higher.

[0137] In a specific embodiment, as shown in FIG8, the insulating member 135 may include an upper plastic 1352 and a lower plastic 1351. The upper plastic 1352 is at least disposed between the electrode terminal 131 and the top cover 134 for electrically isolating the electrode terminal 131 and the top cover 134. The lower plastic 1351 is at least disposed between the adapter 132 and the top cover 134 for electrically isolating the adapter 132 and the top cover 134. Along the direction from the electrode terminal 131 toward the second connecting portion 1322, a limiting arm 1325 is disposed below the lower plastic 1351, that is, the lower plastic 1351 is disposed between the limiting arm 1325 and the top cover 134. The upper plastic 1352 can be connected with the lower plastic 1351 to form a whole. The main body of the insulating member 135 can include all of the upper plastic 1352 and most of the lower plastic 1351. The second protrusion 1333 is provided on the lower plastic 1351. Alternatively, the lower plastic 1351 and the upper plastic 1352 can also be two separate parts. For example, a pressure ring 1353 can be provided between the upper plastic 1352 and the lower plastic 1351. The pressure ring 1353 cooperates with the mounting hole 1341 to seal and fix the electrode terminal 131.

[0138] Understandably, in other embodiments, a limiting arm 1325 can also be provided between the electrode terminal 131 and the second protrusion 1333. In this way, the second connecting portion 1322 of the adapter 133 first forms a cap-like structure to fasten to the end of the electrode terminal 131. Along a direction perpendicular to the direction of the electrode terminal 131 toward the second connecting portion 1322, the second protrusion 1333 is provided on both sides of the two limiting arms 1325, and simultaneously clamps the two limiting arms 1325 and the electrode terminal 131 from both sides. In this way, the limiting arm 1325 and the second protrusion 1333 can be directly attached and connected, and the two can have a better fit, making the insertion connection between the electrode terminal 131 and the second connecting portion 1322 of the adapter 132 more firm and reliable.

[0139] In some embodiments, as shown in FIG11, a first gap 1326 is provided between the second protrusion 1333 and the welding portion 1324 along the direction of the electrode terminal 131 toward the second connection portion 1322.

[0140] There is a first gap 1326 between the second protrusion 1333 and the welding part 1324. Thus, in the direction from the electrode terminal 131 toward the second connecting part 1322, the second protrusion 1333 does not protrude relative to the electrode terminal 131. The second protrusion 1333 will not interfere with the welding between the welding part 1324 and the electrode terminal 131. The surface of the welding part 1324 can always maintain close welding with the end face of the electrode terminal 131. That is, the setting of the limiting structure 133 will not have an adverse effect on the welding connection between the adapter 132 and the electrode terminal 131.

[0141] In some embodiments, the width L1 of the first gap 1326 is 0.3 mm to 0.8 mm.

[0142] Thus, by setting the first gap 1326 between the second protrusion 1333 and the welding portion 1324 within the aforementioned range, the second protrusion 1333 does not protrude relative to the electrode terminal 131, thereby preventing the second protrusion 1333 from interfering with the welding between the welding portion 1324 and the electrode terminal 131. In a specific embodiment, the width L1 of the first gap 1326 can be a specific value such as 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, or 0.8mm.

[0143] In some embodiments, as shown in FIG13, the limiting structure 133 further includes a third protrusion 1334 disposed on the insulating member 135. In a direction perpendicular to the direction of the electrode terminal 131 toward the second connecting portion 1322, the third protrusion 1334 is spaced apart from the side portions of the second protrusion 1333, and the limiting arm 1325 is sandwiched between adjacent second protrusions 1333 and third protrusions 1334.

[0144] In this embodiment, the insulating member 135 is provided with a second protrusion 1333 and a third protrusion 1334, which are spaced apart. That is, the main body is provided with a second protrusion 1333 and a third protrusion 1334 spaced apart. The limiting arm 1325 is adapted to snap between two adjacent second protrusions 1333 and third protrusions 1334. Thus, by providing the second protrusion 1333 and the third protrusion 1334, a slot is formed in the insulating member 135. The second connecting part 1322 of the adapter can be engaged with the slot through the limiting arm 1325, so that the adapter can be snapped and connected to the insulating member 135 through the limiting structure 133. The adapter, the electrode terminal 131, the insulating member 135 and the top cover 134 can form a tightly connected whole, which further improves the ability to resist external forces and further reduces the probability of relative displacement between the adapter 132 and the electrode terminal 131.

[0145] As shown in Figures 14 to 20, in some other embodiments of this application, the outer casing 11 includes a housing 101 and a top cover 134 connected to the housing 101. The electrode terminal 131 is disposed on the top cover 134. The top cover 134 is also provided with an insulating member 135. The insulating member 135 is used to electrically isolate the top cover 134 and the electrode terminal 131, and to electrically isolate the top cover 134 and the adapter. The limiting structure 133 includes a fourth protrusion 1335 disposed on the insulating member 135. The fourth protrusion 1335 is located on at least two opposite sides of the second connection portion 1322 along the direction of the electrode terminal 131 toward the second connection portion 1322. The fourth protrusion 1335 has a portion extending beyond the electrode terminal 131. The fourth protrusion 1335 and the electrode terminal 131 surround to form a third groove 1339. The second connection portion 132 is embedded in the third groove 1339.

[0146] In this embodiment, as shown in Figures 1, 16, and 17, the outer casing 11 includes a housing 101 and a top cover 134. The housing 101 is hollow and has an opening 111. The top cover 134 is sealed to the opening 111 of the housing 101 and forms a receiving cavity 112 with the housing 101. After the electrode assembly 12 is installed into the receiving cavity 112 through the opening 111, it is isolated from the external environment by the top cover 134. The electrode terminal 131 is installed on the top cover 134, and the top cover 134 provides an installation position for the electrode terminal 131. The top cover 134 is also provided with an insulating member 135, which electrically isolates the top cover 134 and the electrode terminal 131, and electrically isolates the top cover 134 and the adapter 132 to reduce the risk of internal short circuits in the battery cell 10.

[0147] In this embodiment, as shown in Figures 17 to 19, the limiting structure 133 further includes a fourth protrusion 1335 disposed on the insulating member 135. The fourth protrusion 1335 has a portion that extends beyond the electrode terminal 131, that is, along the direction of the electrode terminal 131 toward the second connecting portion 1322. The lower end of the fourth protrusion 1335 extends downward and extends beyond the bottom surface of the electrode terminal 131. The electrode terminal 131 is entirely disposed within the internal space defined by the fourth protrusion 1335. The portion of the fourth protrusion 1335 extending beyond the electrode terminal 131 forms a third groove 1339 with the electrode terminal 131. The second connecting portion 1322 is fitted into the third groove 1339. That is, along a direction perpendicular to the direction of the electrode terminal 131 toward the second connecting portion 1322, the fourth protrusion 1335 extends to at least two sides of the second connecting portion 1322. Thus, at least two sides of the second connecting portion 1322 can be limited by the fourth protrusion 1335. Since the position of the insulating member 135 relative to the electrode terminal 131 is fixed, the fourth protrusion 1335 on the insulating member 135 limits the second connecting portion 1322 of the adapter, which can also reduce the risk of the adapter 132 moving relative to the electrode terminal 131 due to external force, thereby reducing the risk of relative movement between the adapter and the electrode terminal 131.

[0148] It should be noted that, unlike the above embodiments, in this embodiment, the limiting structure 133 may only include the fourth protrusion 1335 disposed on the insulating member 135, or it may also include the fourth protrusion 1335 disposed on the insulating member 135 in addition to the first groove 1331 and the first protrusion 1332 in the limiting structure 133.

[0149] In some embodiments, as shown in Figures 18 and 19, the portion of the fourth protrusion 1335 extending beyond the electrode terminal 131 is at least half the thickness of the second connection portion 1322.

[0150] Wherein, the dimension of the portion of the fourth protrusion 1335 extending beyond the electrode terminal 131 is at least half the thickness of the second connecting portion 1322. That is, the extension dimension of the portion of the fourth protrusion 1335 extending beyond the electrode terminal 131 can be equal to half the thickness of the second connecting portion 1322, or it can be greater than half the thickness of the second connecting portion 1322. For example, the extension dimension of the portion of the electrode terminal 131 can be equal to two-thirds of the thickness of the second connecting portion 1322, or it can be equal to the thickness of the second connecting portion 1322, or it can be greater than the thickness of the second connecting portion 1322. In the design, the dimension of the fourth protrusion 1335 can be designed according to the dimension of the lower space of the second connecting portion 1322, so that the fourth protrusion 1335 can effectively limit the relative movement between the electrode terminal 131 and the second connecting portion 1322, and make reasonable use of the original space inside the battery cell 10, so as not to increase the volume of the battery cell 10 due to the setting of the limiting structure 133.

[0151] Thus, the second connecting portion 1322 is welded to the electrode terminal 131 below the electrode terminal 131, and the size of the portion of the fourth protrusion 1335 that extends beyond the electrode terminal 131 is greater than or equal to half the thickness of the second connecting portion 1322, so as to ensure that the fourth protrusion 1335 can effectively limit the second connecting portion 1322 from the side of the second connecting portion 1322.

[0152] In some embodiments, as shown in Figures 18 and 19, the fourth protrusion 1335 is an elastic protrusion that clamps the second connecting portion 1322.

[0153] Thus, the fourth protrusion 1335 is configured as an elastic protrusion, which is adapted to clamp the second connecting portion 1322, so that the fourth protrusion 1335 can effectively limit the second connecting portion 1322.

[0154] In a specific embodiment, the insulating member 135 can be an elastic member as a whole, such as an elastic rubber member or an elastic silicone member. Alternatively, the insulating member 135 can also have only the fourth protrusion 1335 portion configured as an elastic part.

[0155] In some other embodiments, as shown in FIG19, each fourth protrusion 1335 has a second gap 1337 between itself and the sidewall of the adjacent second connection portion 1322 in a direction perpendicular to the direction of the electrode terminal 131 toward the second connection portion 1322, and the width L2 of the second gap 1337 is less than or equal to 0.5 mm.

[0156] In this embodiment, the gap between the fourth protrusion 1335 and the side wall of the adjacent second connecting portion 1322 is set to a maximum of 0.5 mm. The gap between the fourth protrusion 1335 and the side wall of the adjacent second connecting portion 1322 is relatively small, so that the fourth protrusion 1335 can effectively limit the second connecting portion 1322.

[0157] In a specific embodiment, the width L2 of the second gap 1337 can be 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, or 0.5mm, etc.

[0158] In other embodiments, there may be no gap between each fourth protrusion 1335 and the sidewall of the adjacent second connecting portion 1322, that is, each fourth protrusion 1335 is in contact with the sidewall of the adjacent second connecting portion 1322.

[0159] In some embodiments, the fourth protrusion 1335 is an annular protrusion, or the insulating member 135 is provided with a plurality of the fourth protrusions 1335, and at least two of the fourth protrusions 1335 are respectively disposed on opposite sides of the second connecting portion 1322.

[0160] In a specific embodiment, the fourth protrusion 1335 can be a continuous annular protrusion. During assembly, the second connecting part 1322 can be inserted into the space defined by the annular protrusion.

[0161] In other embodiments, the insulating member 135 may also be provided with a plurality of fourth protrusions 1335. During assembly, the second connecting portion 1322 is snapped into the plurality of fourth protrusions 1335. Furthermore, at least two of the plurality of fourth protrusions 1335 are arranged opposite each other at intervals to limit the second connecting portion 1322 from opposite sides.

[0162] For example, as shown in Figures 15, 18, and 19, the insulating member 135 has two fourth protrusions 1335 arranged perpendicularly to the direction of the electrode terminal 131 toward the second connecting portion 1322. The two fourth protrusions 1335 are arranged opposite each other at intervals, and the second connecting portion 1322 is engaged between the two fourth protrusions 1335; or, the insulating member 135 has four fourth protrusions 1335 arranged perpendicularly to the direction of the electrode terminal 131 toward the second connecting portion 1322. Two fourth protrusions 1335 are arranged opposite each other at intervals in one direction, and the other two protrusions are arranged opposite each other at intervals in another direction. The four fourth protrusions 1335 are evenly spaced, and the second connecting portion 1322 is engaged between the four fourth protrusions 1335.

[0163] In some embodiments, as shown in FIG20, the fourth protrusion 1335 is provided with a barb 1336. Along the direction of the electrode terminal 131 toward the second connecting portion 1322, the barb 1336 abuts against the side of the second connecting portion 1322 away from the electrode terminal 131, and the second connecting portion 1322 is sandwiched between the barb 1336 and the electrode terminal 131.

[0164] A barb 1336 is provided on the fourth protrusion 1335, and the second connecting part 1322 is sandwiched between the barb 1336 and the electrode terminal 131. The barb 1336 enables the second connecting part 1322 to better keep in close contact with the electrode terminal 131, thereby further limiting the movement of the second connecting part 1322, so as to further improve the welding stability and reliability of the second connecting part 1322 and the electrode terminal 131.

[0165] Understandably, the barb 1336 is provided with a guide slope for guiding the second connecting part 1322 to engage, or the fourth protrusion 1335 is an elastic wall, so that the second connecting part 1322 can smoothly engage between the fourth protrusion 1335 without compromising the structural stability of the fourth protrusion 1335 and the barb 1336 during assembly.

[0166] Please refer to Figures 1, 2, and 7 to 12. One embodiment of this application provides a battery cell. The battery cell 10 of this embodiment includes a housing 11 and an electrode assembly 12. The housing 11 includes a shell 101 and a top cover 134. The shell 101 is hollow and has an opening 111. The top cover 134 is sealed to the shell 101 and covers the opening 111 of the shell 101. The top cover 134 and the shell 101 form a receiving cavity 112. The electrode assembly 12 is located in the receiving cavity 112 and has tabs 121. The battery cell also includes an adapter 132 and an insulator 135. The electrode terminals 131, the insulator 135, and the adapter 132 are all mounted on the top cover 134. The top cover 134, the electrode terminals 131, the insulator 135, and the adapter 132 are assembled to form a top cover assembly 13. The top cover assembly 13 is connected to the shell 101 as a whole.

[0167] Furthermore, the top cover 134 is provided with a mounting hole 1341, and a portion of the electrode terminal 131 is engaged with the mounting hole 1341. The mounting hole 1341 penetrates the top and bottom surfaces of the top cover 134 along the direction of the electrode terminal 131 toward the second connecting portion 1322. The bottom end of the electrode terminal 131 protrudes from the mounting hole 1341. The adapter 132 includes a first connecting portion 1321 and a second connecting portion 1322. The first connecting portion 1321 is welded to the tab 121 of the electrode assembly 12. The second connecting portion 1322 of the adapter 132 is located at the lower part of the bottom end of the electrode terminal 131. All or at least a portion of the middle area of ​​the bottom end face of the electrode terminal 131 is welded to the surface of the second connecting portion 1322 facing the electrode terminal 131, thereby enabling the electrode assembly 12 to be electrically connected to the electrode terminal 131 through the adapter. The insulating component 135 includes an upper plastic 1352 and a lower plastic 1351. The upper plastic 1352 is at least disposed between the electrode terminal 131 and the top cover 134 for electrically isolating the electrode terminal 131 and the top cover 134. The lower plastic 1351 is at least disposed between the adapter 132 and the top cover 134 for electrically isolating the adapter 132 and the top cover 134. All of the upper plastic 1352 and most of the lower plastic 1351 constitute the main body of the insulating component 135.

[0168] Furthermore, the battery cell 10 is also provided with a limiting structure 133. The limiting structure 133 includes a second groove 1338 provided in the second connecting portion 1322. The second connecting portion 1322 of the adapter 132 includes a welding portion 1324 and two limiting arms 1325 integrally formed and connected to the opposite sides of the welding portion 1324. The two limiting arms 1325 and the welding portion 1324 together form the second groove 1338. The size and shape of the second groove 1338 are approximately the same as the size and shape of the bottom end of the electrode terminal 131. The bottom end of the electrode terminal 131 is adapted to be inserted into the second groove 1338. The bottom end face of the electrode terminal 131 is welded to the welding portion 1324. The two limiting arms 1325 are provided on opposite sides of the electrode terminal 131 in a direction perpendicular to the direction of the electrode terminal 131 toward the second connecting portion 1322. The limiting structure 133 also includes two second protrusions 1333 on the insulating member 135. Along the direction from the electrode terminal 131 toward the second connecting portion 1322, the two second protrusions 1333 protrude downward from the main body. In a direction perpendicular to the direction from the electrode terminal 131 toward the second connecting portion 1322, the two second protrusions 1333 are respectively provided on opposite sides of the electrode terminal 131. One limiting arm 1325 and the electrode terminal 131 cooperate to clamp one second protrusion 1333, and the other limiting arm 1325 and the electrode terminal 131 cooperate to clamp the other second protrusion 1333. That is, the second connecting portion 1322 is shaped like a cap and is fastened to the second protrusion 1333 of the insulating member 135. The limiting arm 1325 is in close contact with the second protrusion 1333.

[0169] Furthermore, along the direction from the electrode terminal 131 toward the second connecting portion 1322, there is a first gap 1326 of approximately 0.5 mm between the second protrusion 1333 and the welding portion 1324. The second protrusion 1333 does not protrude relative to the welding portion 1324, and the second protrusion 1333 is inserted into the second groove 1338, so it will not adversely affect the welding connection between the welding portion 1324 and the electrode terminal 131. Thus, by providing the limiting structure 133 including the aforementioned second groove 1338 and second protrusion 1333, the relative displacement between the second connecting portion 1322 and the electronic terminal can be effectively limited, thereby effectively reducing the probability of shear stress occurring at the tensile welding part, providing an effective guarantee for maintaining a stable and reliable connection between the adapter 132 and the electrode terminal 131, and improving the stability and reliability of the battery cell 10 in use.

[0170] Please refer to Figures 14 to 19 together. Another embodiment of this application provides a battery cell. The structure of the battery cell 10 in this embodiment is basically the same as that of the battery cell 10 in the above embodiment.

[0171] Unlike the above embodiments, in this embodiment, the limiting structure 133 includes a fourth protrusion 1335 disposed on the insulating member 135. Along the direction from the electrode terminal 131 toward the second connecting portion 1322, the fourth protrusion 1335 protrudes downward from the main body of the insulating member 135. There are two fourth protrusions 1335, located perpendicular to the direction from the electrode terminal 131 toward the second connecting portion 1322, on opposite sides of the electrode terminal 131. Each fourth protrusion 1335 has a portion extending beyond the bottom end face of the electrode terminal 131. The dimension of the portion is two-thirds of the thickness of the second connecting portion 1322. Two fourth protrusions 1335 and the electrode terminal 131 surround and form a third groove 1339. The second connecting portion 1322 is embedded in the third groove 1339, that is, the second connecting portion 1322 is located between the two fourth protrusions 1335. The gap between the opposite sides of the second connecting portion 1322 and the adjacent fourth protrusion 1335 does not exceed 0.5mm, allowing the two spaced-apart second protrusions 1333 to limit the relative movement between the electrode terminal 131 and the second connecting portion 1322. Thus, by providing the limiting structure 133, including the aforementioned fourth protrusions 1335, the relative displacement between the second connecting portion 1322 and the electrode terminal 131 can be effectively limited, thereby effectively reducing the probability of shear stress at the tensile welding joint, providing effective protection for a stable and reliable connection between the adapter 132 and the electrode terminal 131, and improving the stability and reliability of the battery cell 10.

[0172] Referring to Figure 21, another embodiment of this application provides a battery apparatus 100, which includes one or more battery cell assemblies for providing 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 connections via a busbar.

[0173] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells 10.

[0174] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells 10 together to form an independent module. As an example, a battery module can be formed by bundling multiple battery cells 10 together with cable ties.

[0175] In some embodiments, the battery device 100 may be a battery pack, which includes a housing 20 and one or more individual battery cells housed within the housing 20.

[0176] 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.

[0177] 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.

[0178] 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 top cover 134 or a bottom plate 22.

[0179] 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.

[0180] Referring to Figure 22, another embodiment of this application provides an energy storage device 303, which can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems, etc. 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.

[0181] In some embodiments, the energy storage device 303 may be an energy storage cabinet or an energy storage container.

[0182] In some embodiments, the energy storage device 303 may include a housing 20 and one or more battery clusters housed within the housing 20. These 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 housing 20.

[0183] In some embodiments, referring to FIG21, the battery device 100 may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells 10 as described in any of the above embodiments, and the multiple battery cells 10 are connected in series, parallel, or mixed connections via a busbar.

[0184] In some embodiments, the battery cell assembly is typically formed by arranging a plurality of battery cells 10.

[0185] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells 10 together to form an independent module. As an example, a battery module can be formed by bundling multiple battery cells 10 together with cable ties.

[0186] In some embodiments, the battery device 100 may be a battery pack, which includes a housing 20 and one or more individual battery cells housed within the housing 20.

[0187] 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.

[0188] 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.

[0189] 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.

[0190] As an example, the thermal management module may include a liquid cooling unit that supplies coolant to each battery device 100 via pipelines for regulating the temperature of the individual battery cells 10.

[0191] 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 modules such as an auxiliary battery management unit (SBMU) and a fusion switch.

[0192] As an example, the central control module can serve as the battery management unit of the energy storage device 303, used to monitor and manage 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 (IMM), a master battery management unit (MBMU), an Ethernet (ETH) module, and a fiber optic conversion module.

[0193] 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.

[0194] 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.

[0195] Referring to Figure 23, another embodiment of this application provides an energy storage system 300. The energy storage system 300 may include one or more energy storage devices 303 and a power converter system (PCS) as described in the above embodiments. The power converter system is used to connect between the power generation device and the energy storage device 303. The power generation device generates electrical energy, which can be stored in the energy storage device 303 through the power converter system. As an example, the power generation device may specifically be a solar panel, hydroelectric power generation equipment, thermal power generation equipment, wind power generation equipment, etc. The specific type of power generation device is not limited in this application.

[0196] Referring to Figure 24, another embodiment of this application provides a charging network 200. In some embodiments, the charging network 200 includes a charging pile 201 and an energy storage device 303 provided in the above embodiments. 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.

[0197] 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.

[0198] 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.

[0199] 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.

[0200] 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, wherein, 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 first connecting portion and a second connecting portion, the first connecting portion being electrically connected to the tab, and the second connecting portion being welded to the electrode terminal; and A limiting structure is used to restrict the relative movement between the electrode terminal and the second connection portion.

2. The battery cell of claim 1, wherein, The limiting structure includes a first groove and a first protrusion, and the second connecting part and the electrode terminal are engaged and snapped together through the first groove and the first protrusion.

3. The battery cell of claim 2, wherein, The second connection portion has a first surface facing the electrode terminal, and at least a portion of the first surface is welded to the electrode terminal; The first surface is recessed to form the first groove, and the first protrusion is provided on the end face of the electrode terminal facing the first surface, and / or the end face of the electrode terminal facing the first surface is recessed to form the first groove, and the first protrusion is provided on the first surface.

4. The battery cell of any one of claims 1 to 3, wherein, The limiting structure further includes a second groove provided in the second connecting portion, the end of the electrode terminal facing the second connecting portion is inserted into the second groove, and at least a portion of the groove wall of the second groove is welded to the electrode terminal.

5. The battery cell of claim 4, wherein, The second connecting portion includes a welding portion and limiting arms connected to at least two opposite sides of the welding portion. The limiting arms and the welding portion surround to form the second groove. The welding portion is disposed opposite the end face of the electrode terminal. At least a portion of the surface of the welding portion facing the electrode terminal is welded to the electrode terminal. The limiting arms are attached to the side of the electrode terminal in a direction perpendicular to the direction of the electrode terminal toward the second connecting portion.

6. The battery cell of claim 5, wherein, The limiting arm is integrally formed with the welding part.

7. The battery cell of claim 5 or 6, wherein, The housing includes a shell and a top cover connected to the shell. The electrode terminal is disposed on the top cover. The top cover is also provided with an insulating member. The insulating member is used to electrically isolate the top cover and the electrode terminal, and to electrically isolate the top cover and the adapter. The limiting structure also includes a second protrusion disposed on the insulating member in a direction perpendicular to the direction of the electrode terminal toward the second connection portion. The second protrusion is attached to opposite sides of the electrode terminal. The limiting arm is connected to the second protrusion.

8. The battery cell of claim 7, wherein, The second protrusion is sandwiched between the limiting arm and the electrode terminal.

9. The battery cell of claim 8, wherein, Along the direction of the electrode terminal toward the second connection portion, there is a first gap between the second protrusion and the welding portion.

10. The battery cell of claim 9, wherein, The width of the first gap is 0.3mm to 0.8mm.

11. The battery cell of any one of claims 8-10, wherein, The limiting structure further includes a third protrusion on the insulating member, which is arranged in a direction perpendicular to the direction of the electrode terminal toward the second connection portion. The third protrusion is spaced apart from the side of the second protrusion, and the limiting arm is clamped between adjacent second protrusions and the third protrusion.

12. The battery cell of any one of claims 1-3, wherein, The housing includes a shell and a top cover connected to the shell. The electrode terminal is disposed on the top cover. The top cover also has an insulating member for electrically isolating the top cover and the electrode terminal, and for electrically isolating the top cover and the adapter. The limiting structure includes a fourth protrusion disposed on the insulating member in a direction perpendicular to the direction of the electrode terminal toward the second connection portion. The fourth protrusion is located on at least two opposite sides of the electrode terminal in the direction of the electrode terminal toward the second connection portion. The fourth protrusion has a portion extending beyond the electrode terminal. The fourth protrusion and the electrode terminal surround to form a third groove, and the second connection portion is fitted into the third groove.

13. The battery cell of claim 12, wherein, The portion of the fourth protrusion that extends beyond the electrode terminal is at least half the thickness of the second connection portion.

14. The battery cell of claim 12 or 13, wherein, The fourth protrusion is provided with a barb, which abuts against the side of the second connection portion away from the electrode terminal along the direction of the electrode terminal. The second connection portion is sandwiched between the barb and the electrode terminal.

15. The battery cell of any one of claims 12-14, wherein, The fourth protrusion is an elastic protrusion, and the fourth protrusion clamps the second connecting part.

16. The battery cell of any one of claims 12-14, wherein, Along a direction perpendicular to the direction of the electrode terminal toward the second connection portion, the fourth protrusion has a second gap between itself and the sidewall of the adjacent second connection portion, the width of the second gap being less than or equal to 0.5 mm.

17. The battery cell of any one of claims 12-16, wherein, The fourth protrusion is an annular protrusion, or the insulating member has multiple fourth protrusions, and at least two of the fourth protrusions are respectively disposed on opposite sides of the second connecting portion.

18. A battery device, wherein, It includes multiple battery cells as described in any one of claims 1 to 17.

19. An energy storage device, wherein, It includes a plurality of battery cells as described in any one of claims 1 to 17 or a plurality of battery devices as described in claim 18, wherein the battery cells or the battery devices are used to store or provide electrical energy.

20. An energy storage system, wherein, It includes a power conversion device and an energy storage device as described in claim 19, wherein the power conversion device is used to electrically connect the power generation device and the energy storage device.

21. A charging network, wherein, It includes a charging pile and an energy storage device as described in claim 19 or an energy storage system as described in claim 20, wherein the energy storage device is used to provide electrical energy to the charging pile.

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