Secondary battery and battery pack

Abstract

The utility model discloses a secondary battery and a battery pack, and belongs to the technical field of batteries, the secondary battery comprises a shell, an electrode assembly and a cover plate assembly; the shell is provided with an accommodating cavity; the electrode assembly is arranged in the accommodating cavity and comprises a body and a tab which are connected with each other; the cover plate assembly comprises a cover plate, a plugging piece, an insulating piece, a pole and a connecting piece; the cover plate is connected with the shell and covers the containing cavity, the cover plate is provided with an operation opening penetrating through the cover plate, and the operation opening is communicated with the containing cavity; the plugging piece is connected with the cover plate and covers the operation opening; the insulating part is connected to one side, facing the electrode assembly, of the cover plate; the pole penetrates through the cover plate and the insulating part; the connecting piece is arranged in the containing cavity, the side, away from the electrode assembly, of the connecting piece is connected with the pole column, the tab is electrically connected with the connecting piece, and at least parts, on the cover plate, of the tab and the connecting piece are exposed out of the operation opening. According to the invention, after the electrode assembly is placed in the shell, the tab and the connecting piece are welded through the operation port, so that the manufacturing efficiency of the secondary battery is improved.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to a secondary battery and battery pack. Background Technology

[0002] In the field of power batteries, when connecting multiple electrode components and cover plate components, it is necessary to place multiple electrode components on both sides of the cover plate component, connect the cover plate component and the electrode components' tabs, and then flip and merge the multiple electrode components before placing them into the housing.

[0003] However, connecting multiple electrode assemblies and cover plate assemblies requires a large operating space to place multiple electrode assemblies on both sides of the cover plate, and the process of flipping and merging the electrode assemblies is difficult, resulting in high manufacturing difficulty and low manufacturing efficiency of secondary batteries. Utility Model Content

[0004] The purpose of this utility model is to provide a secondary battery to solve the technical problem of high manufacturing difficulty and low manufacturing efficiency of secondary batteries; another purpose of this application is to provide a battery pack.

[0005] Technical solution: This application provides a secondary battery having intersecting thickness and length directions, including:

[0006] The shell has a receiving cavity;

[0007] An electrode assembly is disposed in the receiving cavity, the electrode assembly comprising a body and tabs connected to each other;

[0008] The cover plate assembly includes a cover plate, a sealing element, an insulating element, a pole, and a connecting piece;

[0009] The cover plate is connected to the housing and seals the receiving cavity. The cover plate has an operating opening that extends through the cover plate along the thickness direction and communicates with the receiving cavity.

[0010] The sealing element is connected to the cover plate and seals the operating port;

[0011] The insulating element is disposed in the receiving cavity and is connected along the thickness direction to the side of the cover plate facing the electrode assembly;

[0012] The electrode post passes through the cover plate and the insulating member, and the electrode post and the sealing member are spaced apart along the length direction;

[0013] The connecting piece is disposed in the receiving cavity, and the side of the connecting piece opposite to the electrode assembly is connected to the electrode post. The electrode tab is electrically connected to the connecting piece, and at least a portion of the electrode tab and the connecting piece are exposed on the cover plate along the thickness direction of the operating port.

[0014] A support member is disposed in the receiving cavity and connected to the insulating member. Along the thickness direction, the support member is connected to the side of the body facing the cover plate. The connecting piece is located between the support member and the insulating member. The support member has an elastic part on the side away from the body. The elastic part abuts against the connecting piece along the thickness direction.

[0015] In some embodiments, the support member includes:

[0016] A base, which is connected to the insulating member, is connected to the side of the body facing the insulating member along the thickness direction, and the connecting piece is located between the base and the insulating member;

[0017] An elastic portion, one end of which is connected to the base, and the other end of which is away from the base, abuts against the connecting piece.

[0018] In some embodiments, the insulating member has a second mounting hole that connects the operating port and the receiving cavity, and the electrode tab passes through the second mounting hole;

[0019] The support member also includes a connecting portion, through which the base is connected to the insulating member.

[0020] In some embodiments, the secondary battery further has a width direction, and the thickness direction, the length direction and the width direction intersect each other; the number of elastic portions is multiple, at least some of the multiple elastic portions are spaced apart along the width direction, and at least two elastic portions spaced apart along the width direction abut against the same connecting piece.

[0021] In some embodiments, the base is provided with a first connection hole through the thickness direction, a portion of the electrode tab passes through the first connection hole, and is connected to the side of the connecting piece opposite to the electrode assembly.

[0022] In some embodiments, the first connecting hole is located between two adjacent elastic portions along the width direction, and the connecting piece is provided with a second connecting hole through the thickness direction. The second connecting hole communicates with the first connecting hole, and a portion of the tab that passes through the first connecting hole passes through the second connecting hole.

[0023] In some embodiments, the support further includes a protrusion connected to the base on one side of the base along the thickness direction near the connecting piece, the protrusion surrounding at least one of the elastic portions.

[0024] In some embodiments, the cover plate further has a width direction, and the thickness direction, the length direction and the width direction intersect each other; the support member includes a plurality of protrusions, at least a portion of the plurality of protrusions are spaced apart along the width direction, and at least two of the protrusions spaced apart along the width direction are located on the same side of the connecting piece near the base along the thickness direction.

[0025] In some embodiments, the base is provided with a first connecting hole through the thickness direction, and a portion of the electrode tab passes through the first connecting hole; the electrode tab is located between at least two of the protrusions along the width direction.

[0026] Accordingly, this application also provides a battery pack, including a secondary battery as described in any of the above embodiments.

[0027] Beneficial Effects: The secondary battery provided in this application includes a casing, an electrode assembly, and a cover assembly; the casing has a receiving cavity; the electrode assembly is disposed in the receiving cavity and includes a body and tabs connected to each other; the cover assembly includes a cover plate, a sealing member, an insulating member, a terminal post, and a connecting piece; the cover plate is connected to the casing and seals the receiving cavity, and the cover plate has an operating opening extending through the cover plate along its thickness direction, the operating opening communicating with the receiving cavity; the sealing member is connected to the cover plate and seals the operating opening; the insulating member is disposed in the receiving cavity and is connected along its thickness direction to one side of the cover plate facing the electrode assembly. The cover plate and the insulating component are arranged sideways; the electrode post passes through the cover plate and the insulating component, and the electrode post and the sealing component are spaced apart along the length direction; the connecting piece is disposed in the receiving cavity, and the side of the connecting piece opposite to the electrode assembly is connected to the electrode post; the tab is electrically connected to the connecting piece; at least a portion of the tab and the connecting piece on the cover plate along the thickness direction is exposed through the operating port; the support member is disposed in the receiving cavity and connected to the insulating component; along the thickness direction, the support member is connected to the side of the body facing the cover plate; the connecting piece is located between the support member and the insulating component; the side of the support member opposite to the body is provided with an elastic part, and the elastic part abuts against the connecting piece along the thickness direction. The cover plate in this application is provided with an operating port, which allows the tab and the connecting piece to be welded after the electrode assembly is placed into the housing, thereby reducing the welding difficulty of the tab and the connecting piece and improving the manufacturing efficiency of the secondary battery.

[0028] Meanwhile, this application provides a support component to support the connecting piece between the body and the connecting piece, thereby improving the welding efficiency of the electrode tab and the connecting piece, further reducing the welding difficulty of the electrode tab and the connecting piece, and further improving the manufacturing efficiency of the secondary battery. Attached Figure Description

[0029] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0030] Figure 1This is a schematic diagram of the structure of a secondary battery provided in an embodiment of this application;

[0031] Figure 2 An exploded view of the cover plate assembly of the secondary battery provided in an embodiment of this application;

[0032] Figure 3 A cross-sectional view of a secondary battery provided in an embodiment of this application;

[0033] Figure 4 for Figure 3 Detailed view of section A in the middle frame;

[0034] Figure 5 for Figure 3 Detailed view of section B in the middle frame;

[0035] Figure 6 This is a schematic diagram of the structure of the support member in the secondary battery provided in the embodiments of this application;

[0036] Figure 7 This is a schematic diagram of the structure of the connecting piece in the secondary battery provided in the embodiments of this application;

[0037] Reference numerals in the attached drawings: 100-housing, 110-receiving cavity, 200-electrode assembly, 210-body, 220-electrode tab, 300-cover assembly, 310-cover, 311-operation port, 320-electrode post, 330-support member, 331-base, 332-first connecting hole, 333-connecting part, 334-elastic part, 335-protrusion, 340-connecting piece, 341-second connecting hole, 350-insulator, 351-second mounting hole, 360-sealing member. Detailed Implementation

[0038] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0039] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for mutual communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. In the description of this application, "multiple" means two or more, unless otherwise expressly and specifically limited. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0040] It should also be noted that in the accompanying drawings of the embodiments of this application, the arrows labeled X, Y, and Z respectively represent the thickness direction X, the width direction Y, and the length direction Z. The description of this application introduces the length direction X, the width direction Y, and the thickness direction Z to more clearly express the relative positional relationship involved in this application. The length direction X, the width direction Y, and the thickness direction Z are three relative directions that intersect each other, rather than absolute directions. In practical applications, the length direction X, the width direction Y, and the thickness direction Z can point to any direction in space, as long as the intersection relationship between them is maintained.

[0041] The following disclosure provides many different implementations or examples for carrying out different structures of this application. To simplify the disclosure of this application, the components and arrangements of specific examples are described below. Of course, these are merely examples and are not intended to limit this application.

[0042] In the field of power batteries, when connecting multiple electrode components 200 and cover plate components 300, it is necessary to place multiple electrode components 200 on both sides of cover plate components 300, connect the cover plate components 300 and the electrode tabs 220 of electrode components 200, and then flip and merge multiple electrode components 200 and put them into the housing 100.

[0043] However, connecting multiple electrode assemblies 200 and cover plate assembly 300 requires a large operating space to place multiple electrode assemblies 200 on both sides of cover plate 310, and the process of flipping electrode assemblies 200 and merging them is difficult, resulting in high manufacturing difficulty and low manufacturing efficiency of secondary batteries.

[0044] To address the significant challenges in reversing and merging the electrode assembly 200, resulting in high manufacturing difficulty and low efficiency for secondary batteries, an embodiment of this application provides a secondary battery. Please refer to [link to relevant documentation]. Figure 1 The secondary battery includes a housing 100, an electrode assembly 200, and a cover assembly 300, and has a receiving cavity 110. The electrode assembly 200 is disposed in the receiving cavity 110 and includes a body 210 and an electrode tab 220 connected to each other. The cover assembly 300 includes a cover plate 310, a sealing member 360, an insulating member 350, an electrode post 320, and a connecting piece 340. The cover plate 310 is connected to the housing 100 and covers the receiving cavity 110. The cover plate 310 has an operating opening 311 that extends through the cover plate 310 in the thickness direction Z and communicates with the receiving cavity 110. The sealing member 360 is connected to the cover plate 310 and covers the operating opening 311. The insulating member 350 is disposed in the receiving cavity 110 and is connected in the thickness direction Z to the side of the cover plate 310 facing the electrode assembly 200. The electrode post 320 is inserted through the cover plate. The cover plate 310 and the insulating member 350, the electrode post 320 and the sealing member 360 are spaced apart along the length direction X; the connecting piece 340 is disposed in the receiving cavity 110, and the side of the connecting piece 340 facing away from the electrode assembly 200 is connected to the electrode post 320, the electrode tab 220 is electrically connected to the connecting piece 340, and at least a portion of the electrode tab 220 and the connecting piece 340 are exposed on the cover plate 310 along the thickness direction Z of the operating opening 311; the support member 330 is disposed in the receiving cavity 110 and connected to the insulating member 350, and along the thickness direction Z of the support member 330 is connected to the side of the body 210 facing the cover plate 310, the connecting piece 340 is located between the support member 330 and the insulating member 350, and the side of the support member 330 facing away from the body 210 is provided with an elastic part 334, the elastic part 334 abutting against the connecting piece 340 along the thickness direction Z. This will be described in detail below.

[0045] In some embodiments, the battery pack includes a housing and a plurality of secondary batteries disposed within the housing. These secondary batteries include, but are not limited to, lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and this disclosure does not limit the specific type. The battery pack provides power to an electrical device. The electrical device can be a mobile phone, portable device, laptop computer, electric vehicle, electric car, ship, spacecraft, electric toy, or power tool, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.

[0046] The secondary battery in the embodiments of this application will be described below.

[0047] Please see Figure 1 and Figure 2 In some embodiments, the secondary battery has intersecting thickness direction Z and length direction X, and includes a housing 100, an electrode assembly 200 and a cover assembly 300, and has a receiving cavity 110; the electrode assembly 200 is disposed in the receiving cavity 110, and the electrode assembly 200 includes an interconnected body 210 and a tab 220.

[0048] The secondary battery also includes a cover assembly 300, which includes a cover plate 310, a sealing element 360, an insulating element 350, an electrode post 320, and a connecting piece 340. The cover plate 310 is connected to the housing 100 and covers the receiving cavity 110. The cover plate 310 has an operation port 311 extending through the cover plate 310 along the thickness direction Z, and the operation port 311 communicates with the receiving cavity 110. The sealing element 360 is connected to the cover plate 310 and covers the operation port 311. The insulating element 350 is disposed in the receiving cavity 110 and extends along the thickness direction Z. The cover plate 310 is connected to the side facing the electrode assembly 200 in the Z direction; the electrode post 320 passes through the cover plate 310 and the insulating member 350, and the electrode post 320 and the sealing member 360 are spaced apart along the length direction X; the connecting piece 340 is disposed in the receiving cavity 110, and the side of the connecting piece 340 away from the electrode assembly 200 is connected to the electrode post 320; the electrode tab 220 is electrically connected to the connecting piece 340; at least a portion of the electrode tab 220 and the connecting piece 340 along the thickness direction Z on the cover plate 310 is exposed at the operating port 311;

[0049] The secondary battery also includes a support member 330, which is disposed in the receiving cavity 110 and located on the side of the insulating member 350 facing the body 210 along the thickness direction Z. The support member 330 is connected to the connecting piece 340, which is located between the support member 330 and the insulating member 350. The support member 330 has an elastic part 334 on the side away from the body 210, and the elastic part 334 abuts against the connecting piece 340 along the thickness direction Z.

[0050] In some embodiments, the support 330 is made of an insulating material.

[0051] In some embodiments, the support member 330 is connected to one side of the insulating member 350 along the thickness direction Z; in other embodiments, the support member 330 is connected to one side of the insulating member 350 along a direction perpendicular to the thickness direction X. (See also...) Figure 4 That is, part of the support member 330 is connected to the periphery of the insulating member 350.

[0052] In this embodiment, the cover plate 310 of the secondary battery has an operation port 311, and at least a portion of the connecting piece 340 and the tab 220 protrudes from the operation port 311 along the thickness direction Z. In other words, along the thickness direction Z, the portion of the connecting piece 340 and the tab 220 projecting onto the plane of the surface of the cover plate 310 facing the receiving cavity 110 is located within the operation port 311. Through this operation port 311, the tab 220 and the connecting piece 340 located inside the receiving cavity 110 can be welded, reducing the manufacturing difficulty of the secondary battery and improving its manufacturing efficiency. Especially in the manufacture of secondary batteries with multiple electrode assemblies 200, this simplifies the core-joining operation after the electrode assembly 200 and the cover plate assembly 300 are connected, reducing the operational difficulty during the core-joining process, thus reducing the manufacturing difficulty of the secondary battery and improving its manufacturing efficiency.

[0053] Specifically, in this embodiment, multiple electrode components 200 are first cored together, and then the tabs 220 and connecting pieces 340 are welded together, which simplifies the core-joining process and reduces the manufacturing difficulty of the secondary battery.

[0054] Understandably, when welding the tab 220 and the connecting piece 340 through the operating port 311, since the tab 220 is located on the side of the connecting piece 340 away from the body 210, the connecting piece 340 may be subjected to a force along the thickness direction Z from the tab 220 towards the body 210. Furthermore, since only one end of the tab 220 is connected to the pole post 320, and the other end is suspended, the tab 220 may deform towards the body 210 after being subjected to the force from the tab 220 towards the body 210, potentially causing a short circuit due to contact between the connecting piece 340 and the body 210.

[0055] Please refer to the above embodiments as well. Figure 3 and Figure 5 The secondary battery also includes a support member 330, which is further provided with an elastic portion 334 that abuts against the connecting piece 340 from the side facing the body 210. This provides support for the connecting piece 340, thereby preventing the connecting piece 340 from deforming towards the body 210 and connecting with the body 210, which could lead to a short circuit. Furthermore, since the dimensions of the cover assembly 300 along the thickness direction Z vary for various reasons, the elastic portion 334, which can elastically deform along the thickness direction Z, can support the connecting piece 340 without affecting the connection between the cover assembly 300 and the housing 100.

[0056] Specifically, when the cover plate assembly 300 has a large dimension along the thickness direction Z, the elastic portion 334 exhibits a large degree of elastic deformation after being connected to the housing 100, thus providing support for the connecting piece 340. When the cover plate assembly 300 has a small dimension along the thickness direction Z, the elastic portion 334 exhibits a small degree of elastic deformation after being connected to the housing 100, yet still provides support for the connecting piece 340.

[0057] In some embodiments, please refer to Figure 4 and Figure 6 The support member 330 includes a base 331 and an elastic part 334. The base 331 is connected to the insulating member 350. The base 331 is connected to the side of the body 210 facing the insulating member 350 along the thickness direction Z. The connecting piece 340 is located between the base 331 and the insulating member 350.

[0058] The elastic part 334 has one end connected to the base 331 and the other end of the elastic part 334 away from the base 331 abutting against the connecting piece 340.

[0059] In some embodiments, please refer to Figure 4 The base 331 is connected to the side of the body 210 facing the connecting piece 340 along the thickness direction Z, so that the body 210 can provide support for the base 331, thereby enabling the base 331 to provide support for the elastic part 334.

[0060] In the above embodiment, the base 331, which is connected to both the insulating member 350 and the body 210, is positioned in the thickness direction Z, and the elastic part 334, which is connected to the base 331 on the side along the thickness direction Z, is positioned by the base 331, so that the elastic part 334 can provide support for the connecting piece 340 in the thickness direction Z.

[0061] It should be noted that in some embodiments, the connecting piece 340 is supported by the elastic part 334 after being subjected to pressure. When the force on the connecting piece 340 is large, the deformation of the connecting piece 340 is also large. At this time, the base 331 can also provide support for the connecting piece 340 and insulate the connecting piece and the body 210, preventing the connecting piece 340 from being inserted into the body 210, thus reducing the manufacturing difficulty of the secondary battery.

[0062] In some embodiments, please refer to Figure 2 The insulating member 350 has a second mounting hole 351, which connects the operating port 311 and the receiving cavity 110. The electrode tab 220 passes through the second mounting hole 351. The support member 330 also includes a connecting portion 333, and the base 331 is connected to the insulating member 350 through the connecting portion 333.

[0063] In some embodiments, please refer to Figure 4 The insulating member 350 is spaced apart from the housing 100 along a direction perpendicular to the thickness direction Z. One end of the connecting part 333 is connected to the base 331, and the other end of the connecting part 333 is disposed in the gap between the insulating member 350 and the housing 100 and is connected to the insulating member 350.

[0064] In some embodiments, a buckle is provided on the periphery of the insulating member 350, and a connecting hole is provided on the connecting part 333 in a direction perpendicular to the thickness direction Z. The buckle can pass through the connecting hole to achieve the fastening of the connecting part 333 and the insulating member 350.

[0065] In the above embodiment, the insulating member 350 is attached to the side of the cover plate 310 facing the electrode assembly 200. A second mounting hole 351 is provided so that the welding of the tab 220 and the connecting piece 340 can be performed through the operating port 311 and the second mounting hole 351. The insulating member 350, while insulating the cover plate 310 and the connecting piece 340, does not obstruct the welding operation of the connecting piece 340 and the tab 220. Simultaneously, the support member 330 connected to the insulating member 350 can also be limited along the length direction X and the width direction Y, and the insulating member 350 can also limit the support member 330 along the thickness direction Z.

[0066] In some embodiments, please refer to Figure 6 The secondary battery also has a width direction Y, a thickness direction Z, a length direction X, and a width direction Y intersecting each other; there are multiple elastic parts 334, at least some of the multiple elastic parts 334 are spaced apart along the width direction Y, and at least two elastic parts 334 spaced apart along the width direction Y abut against the same connecting piece 340.

[0067] It is understandable that, since the secondary battery in this application includes multiple electrode assemblies 200, the connecting piece 340 needs to connect multiple electrode assemblies 200 arranged along the width direction Y, and the dimension of the connecting piece 340 along the width direction Y is also relatively large.

[0068] In the above embodiment, by providing a plurality of elastic portions 334 and such that the plurality of elastic portions 334 are spaced apart along the width direction Y, the connecting piece 340 can be supported by at least two elastic portions 334 spaced apart along the width direction Y, thereby making the support of the support member 330 on the connecting piece 340 more balanced in the width direction Y.

[0069] In some embodiments, please refer to Figure 6 The multiple elastic parts 334 are also spaced apart along the length direction X, that is, the multiple elastic parts 334 are arranged in an array along the length direction X and the width direction Y.

[0070] In some embodiments, at least two elastic portions 334 spaced apart along the length direction X abut against the same connecting piece 340, so that the support member 330 provides relatively balanced support to the connecting piece 340 along the length direction X. At the same time, a plurality of elastic portions 334 spaced apart along the length direction X can also support a plurality of connecting pieces 340 on the cover plate assembly 300 that are arranged along the length direction X.

[0071] In the above embodiment, by providing multiple elastic parts 334, the support of the support member 330 on the connecting piece 340 can be uniformly provided, thereby improving the support effect of the support member 330 on the connecting piece 340, preventing the connecting piece 340 from tilting after being subjected to force, and preventing the unsupported area from inserting into the body 210. This reduces the welding difficulty of the connecting piece 340 and the tab 220 and improves the manufacturing efficiency of the secondary battery.

[0072] In some embodiments, please refer to Figure 4 and Figure 5 The base 331 has a first connecting hole 332 through it along the thickness direction Z. A portion of the tab 220 passes through the first connecting hole 332 and is connected to the side of the connecting piece 340 away from the electrode assembly 200.

[0073] In other words, part of the tab 220 passes through the first connection hole 332, and part of the tab 220 is fixedly connected to the side of the connecting piece 340 away from the electrode assembly 200.

[0074] Specifically, when connecting the cover plate assembly 300 and the electrode assembly 200, the tab 220 is first passed through the first connecting hole 332, and then the tab 220 is folded so that part of the tab 220 is located on the side of the connecting piece 340 away from the electrode assembly 200, and then the connecting piece 340 and the tab 220 are welded.

[0075] In the above embodiment, by providing the first connection hole 332, the connection between the tab 220 and the connecting piece 340 is made to avoid needing to bypass the base 331, thereby keeping the tab 220 away from the housing 100 and preventing contact between the tab 220 and the housing 100, further reducing the possibility of short circuit in the secondary battery. Simultaneously, folding part of the tab 220 onto the side of the connecting piece 340 away from the electrode assembly 200 also facilitates the positioning of the tab 220 during welding, thus reducing the difficulty of connecting the tab 220 and the connecting piece 340. Furthermore, folding the tab 220 onto the side of the connecting piece 340 away from the electrode assembly 200 also reduces the space occupied by the tab 220 in the thickness direction Z of the receiving cavity 110, thereby improving the internal space utilization of the secondary battery, making the secondary battery structure more compact, and improving the volumetric energy density of the secondary battery.

[0076] In some embodiments, please refer to Figure 4 , Figure 5 and Figure 7 The first connecting hole 332 is located between two adjacent elastic parts 334 along the width direction Y. The connecting piece 340 is provided with a second connecting hole 341 along the thickness direction Z. The second connecting hole 341 communicates with the first connecting hole 332. The part of the tab 220 that passes through the first connecting hole 332 passes through the second connecting hole 341.

[0077] In the above embodiment, by providing a second connection hole 341, the tab 220 is prevented from needing to go around the side of the connecting piece 340 along the width direction Y when it is connected to the side of the connecting piece 340 away from the electrode assembly 200. This reduces the length of the tab 220 and also reduces the difficulty of connecting the tab 220 to the connecting piece 340.

[0078] Additionally, it is understood that part of the tab 220 can be connected to one side of the second connecting hole 341 along the width direction Y, and part of the tab 220 can be connected to the other side of the second connecting hole 341 along the width direction Y. That is, the connecting piece 340 will receive a force along the thickness direction Z on both sides of the second connecting hole 341 along the width direction Y during the welding process. The elastic part 334 provided on both sides of the first connecting hole 332 along the width direction Y can support the part where the connecting piece 340 is welded to the tab 220, thereby further improving the support effect of the support member 330 on the connecting piece 340.

[0079] In some embodiments, please refer to Figure 5 and Figure 6 The support member 330 also includes a protrusion 335, which is connected to the side of the base 331 along the thickness direction Z near the connecting piece 340, and the protrusion 335 surrounds at least one elastic part 334.

[0080] It is understood that in some embodiments, the dimensions of some pole posts 320 along the thickness direction Z are smaller than the dimensions of other pole posts 320 along the thickness direction Z, which leads to different spacing between the connecting piece 340 and the base 331 connected to different pole posts 320 in the thickness direction Z.

[0081] In some embodiments, the dimension of the negative electrode post 320 along the thickness direction Z is smaller than the dimension of the positive electrode post 320 along the thickness direction Z.

[0082] In the above embodiment, by providing the protrusion 335 so that the gap between each connecting piece 340 and the support member 330 is the same along the thickness direction Z, the support member 330 can support the connecting piece 340 with the base 331 or the protrusion 335 when each connecting piece 340 undergoes a large degree of deformation, so as to avoid the connecting piece 340 from being damaged due to excessive deformation. This further reduces the difficulty of welding the connecting piece 340 and the tab 220, thereby reducing the manufacturing difficulty of the secondary battery and improving the manufacturing efficiency of the secondary battery.

[0083] In some embodiments, please refer to Figure 6 The cover plate 310 also has a width direction Y, a thickness direction Z, a length direction X, and a width direction Y intersecting each other; the support member 330 includes a plurality of protrusions 335, at least a portion of the plurality of protrusions 335 being spaced apart along the width direction Y, and at least two protrusions 335 spaced apart along the width direction Y being located along the thickness direction Z on the same side of the connecting piece 340 near the base 331.

[0084] In some embodiments, a plurality of protrusions 335 are also spaced apart along the length direction X.

[0085] In some embodiments, a plurality of protrusions 335 are arranged in an array along the length direction X and the width direction Y.

[0086] In the above embodiment, by providing multiple protrusions 335 spaced apart along the width direction Y, the supporting force of the support member 330 on the connecting piece 340 is evenly distributed in the width direction Y, thereby making the supporting effect of the support member 330 on the connecting piece 340 better, preventing the connecting piece 340 from tilting after being subjected to force and inserting into the body 210, and further reducing the welding difficulty of the connecting piece 340 and the tab 220.

[0087] In some embodiments, the base 331 is provided with a first connecting hole 332 through the thickness direction Z, and a portion of the tab 220 passes through the first connecting hole 332; the tab 220 is located between at least two protrusions 335 along the width direction Y.

[0088] In the above embodiment, by providing a first connecting hole 332 and making the tab 220 that partially passes through the first connecting hole 332 located between the protrusions 335, the portion of the connecting piece 340 connected to the tab 220 can be supported by the protrusions 335 in the thickness direction Z.

[0089] It is understandable that part of the tab 220 can be connected to one side of the second connecting hole 341 along the width direction Y, and part of the tab 220 can be connected to the other side of the second connecting hole 341 along the width direction Y. That is, the connecting piece 340 will be subjected to a force along the thickness direction Z on both sides of the second connecting hole 341 along the width direction Y during the welding process. At least two protrusions 335 are provided on the side of the same connecting piece 340 near the base 331, which are spaced apart along the width direction Y. This further improves the effect of the support member 330 in supporting the connecting piece 340, avoids excessive deformation of the connecting piece 340, which could lead to damage, and further reduces the difficulty of welding the connecting piece 340 and the tab 220. This reduces the manufacturing difficulty of the secondary battery and improves the manufacturing efficiency of the secondary battery.

[0090] Accordingly, this application also provides a battery pack including a secondary battery as described in any of the above embodiments.

[0091] In summary, the secondary battery provided in this application embodiment includes a housing 100, an electrode assembly 200, and a cover assembly 300. The housing 100 has a receiving cavity 110. The electrode assembly 200 is disposed in the receiving cavity 110 and includes a body 210 and tabs 220 connected to each other. The cover assembly 300 includes a cover plate 310, a sealing member 360, an insulating member 350, a terminal post 320, and a connecting piece 340. The cover plate 310 is connected to the housing 100 and covers the receiving cavity 110. The cover plate 310 has an operation opening 311 extending through the cover plate 310 in the thickness direction Z and communicating with the receiving cavity 110. The sealing member 360 is connected to the cover plate 310 and covers the operation opening 311. The insulating member 350 is disposed in the receiving cavity 110 and is connected to the cover plate 310 in the thickness direction Z towards the electrode assembly 200. On one side; the electrode post 320 passes through the cover plate 310 and the insulating member 350, and the electrode post 320 and the sealing member 360 are spaced apart along the length direction X; the connecting piece 340 is disposed in the receiving cavity 110, and the side of the connecting piece 340 away from the electrode assembly 200 is connected to the electrode post 320, the electrode tab 220 is electrically connected to the connecting piece 340, and at least part of the electrode tab 220 and the connecting piece 340 on the cover plate 310 along the thickness direction Z exposes the operating port 311; the support member 330 is disposed in the receiving cavity 110, and is located on the side of the insulating member 350 facing the body 210 along the thickness direction Z, the support member 330 is connected to the connecting piece 340, the connecting piece 340 is located between the support member 330 and the insulating member 350, and the side of the support member 330 away from the body 210 is provided with an elastic part 334, and the elastic part 334 abuts against the connecting piece 340 along the thickness direction Z. The cover plate 310 in this application is provided with an operation port 311, which allows the electrode assembly 200 to be placed into the housing 100 and then the electrode tab 220 and the connecting piece 340 to be welded through the operation port 311. This reduces the welding difficulty of the electrode tab 220 and the connecting piece 340 and improves the manufacturing efficiency of the secondary battery.

[0092] Meanwhile, this application provides a support member 330 to support the connecting piece 340 between the body 210 and the connecting piece 340, thereby improving the welding efficiency of the tab 220 and the connecting piece 340, further reducing the welding difficulty of the tab 220 and the connecting piece 340, and further improving the manufacturing efficiency of the secondary battery.

[0093] The above provides a detailed description of a secondary battery and battery pack provided in the embodiments of this application. Specific examples have been used in this application to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features; and 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.

Claims

1. A secondary battery having intersecting thickness and length directions, characterized in that, include: The shell has a receiving cavity; An electrode assembly is disposed in the receiving cavity, the electrode assembly comprising a body and tabs connected to each other; The cover plate assembly includes a cover plate, a sealing element, an insulating element, a pole, and a connecting piece; The cover plate is connected to the housing and seals the receiving cavity. The cover plate has an operating opening that extends through the cover plate along the thickness direction and communicates with the receiving cavity. The sealing element is connected to the cover plate and seals the operating port; The insulating element is disposed in the receiving cavity and is connected along the thickness direction to the side of the cover plate facing the electrode assembly; The electrode post passes through the cover plate and the insulating member, and the electrode post and the sealing member are spaced apart along the length direction; The connecting piece is disposed in the receiving cavity, and the side of the connecting piece opposite to the electrode assembly is connected to the electrode post. The electrode tab is electrically connected to the connecting piece, and at least a portion of the electrode tab and the connecting piece are exposed on the cover plate along the thickness direction of the operating port. A support member is disposed in the receiving cavity and connected to the insulating member. Along the thickness direction, the support member is connected to the side of the body facing the cover plate. The connecting piece is located between the support member and the insulating member. The support member has an elastic part on the side away from the body. The elastic part abuts against the connecting piece along the thickness direction.

2. The secondary battery according to claim 1, characterized in that, The support member includes: A base, which is connected to the insulating member, is connected to the side of the body facing the insulating member along the thickness direction, and the connecting piece is located between the base and the insulating member; An elastic portion, one end of which is connected to the base, and the other end of which is away from the base, abuts against the connecting piece.

3. The secondary battery according to claim 2, characterized in that, The insulating component has a second mounting hole, which connects the operating port and the receiving cavity, and the electrode tab passes through the second mounting hole; The support member also includes a connecting portion, through which the base is connected to the insulating member.

4. The secondary battery according to claim 2, characterized in that, The secondary battery also has a width direction, and the thickness direction, length direction and width direction intersect each other; the number of elastic parts is multiple, at least some of the multiple elastic parts are spaced apart along the width direction, and at least two elastic parts spaced apart along the width direction abut against the same connecting piece.

5. The secondary battery according to claim 4, characterized in that, The base is provided with a first connecting hole through it along the thickness direction, and a portion of the electrode tab passes through the first connecting hole and is connected to the side of the connecting piece opposite to the electrode assembly.

6. The secondary battery according to claim 5, characterized in that, The first connecting hole is located between two adjacent elastic portions along the width direction, and the connecting piece is provided with a second connecting hole through the thickness direction. The second connecting hole communicates with the first connecting hole, and the portion of the electrode tab that passes through the first connecting hole passes through the second connecting hole.

7. The secondary battery according to claim 2, characterized in that, The support member further includes a protrusion connected to the base on one side of the base along the thickness direction near the connecting piece, the protrusion surrounding at least one of the elastic portions.

8. The secondary battery according to claim 7, characterized in that, The cover plate also has a width direction, and the thickness direction, the length direction and the width direction intersect each other; the support member includes a plurality of protrusions, at least a portion of the plurality of protrusions are spaced apart along the width direction, and at least two of the protrusions spaced apart along the width direction are located on the same side of the connecting piece near the base along the thickness direction.

9. The secondary battery according to claim 8, characterized in that, The base is provided with a first connecting hole through the thickness direction, and a portion of the electrode tab passes through the first connecting hole; the electrode tab is located between at least two of the protrusions along the width direction.

10. A battery pack, characterized in that, Includes the secondary battery as described in any one of claims 1-9.

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